3714 Kinnear Place Saskatoon, SK Canada S7P 0A6 Ph: (306) 373-5505 Fx: (306) 374-2245 www.littelfuse.com/relayscontrols SE-330 MANUAL NEUTRAL-GROUNDING-RESISTOR MONITOR REVISION 9-A-112913 LITTELFUSE STARTCO NEUTRAL-GROUNDING-RESISTOR MONITOR GROUND FAULT SE-330 RESISTOR FAULT DIAGNOSTIC TRIP TRIP CALIBRATED RELAY K1 8 6 10 15 20 40 60 4 80 2 100 GF TRIP LEVEL (% CT RATING) 0.5 0.7 1.0 0.4 0.3 0.2 0.1 2.0 3.0 5.0 10.0 POWER 170 130 100 200 340 800 1200 60 1700 20 2000 VN TRIP LEVEL (S5 CAL GF TRIP TIME (s) 20 K Ω VN x 1 100 K Ω ) VN x 5 1.8 2.0 2.2 1.6 2.4 1.4 2.6 1.2 2.8 1.0 3.0 PULSE PERIOD (s) RESET Copyright 2013 Littelfuse Startco All rights reserved. Publication: SE-330-M Document: S95-C330-00000 Printed in Canada. Page i Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor TABLE OF CONTENTS PAGE 1. General ................................................................... 1 1.1 Modern Resistance-Grounded Systems ................... 1 1.2 SE-330 NGR Monitoring ......................................... 1 2. Operation ................................................................ 2 2.1 Settings .................................................................... 2 2.1.1 GF Trip Time ................................................ 2 2.1.2 GF Trip Level ............................................... 2 2.1.3 VN Trip Level ............................................... 2 2.1.4 Pulse-Period Adjustment .............................. 3 2.1.5 Configuration Settings .................................. 3 2.1.5.1 Relay K1 Function (S1) ................... 4 2.1.5.2 Trip-Relay Mode and Trip Memory Mode(S2) ............................... 4 2.1.5.3 Ground-Fault-Trip Latch (S3).......... 4 2.1.5.4 Resistor-Fault-Trip Latch (S4)......... 4 2.1.5.5 Sensing-Resistor Selection (S5)....... 4 2.1.5.6 Frequency (S6)................................. 4 2.1.5.7 Spare (S7) ........................................ 4 2.1.5.8 Upgrade Enable (S8)........................ 4 2.2 Calibration ............................................................... 4 2.3 Pulsing Operation .................................................... 4 2.4 Trip Indication and Reset......................................... 5 2.5 Remote Operation .................................................... 5 2.6 Relay K1 LED ......................................................... 5 2.7 Unit Healthy Output ................................................ 5 2.8 Diagnostic LED ....................................................... 5 2.9 Analog Output ......................................................... 6 3. 3.1 3.2 3.3 3.4 3.5 Installation .............................................................. 6 SE-330 ..................................................................... 6 Sensing Resistor..................................................... 12 Ground-Fault CT ................................................... 20 Isolated Ground Connection .................................. 24 Pulsing Connection ................................................ 25 4. Communications .................................................. 25 4.1 Local Communications Port .................................. 25 4.1.1 Local Data Acquisition ............................... 25 4.1.2 Local Communications Commands ............ 25 4.1.3 Firmware Upgrade ...................................... 25 4.2 Network Communications ..................................... 25 5. Troubleshooting ................................................... 26 6. 6.1 6.2 6.3 Technical Specifications ...................................... 27 SE-330 ................................................................... 27 Sensing Resistors ................................................... 28 Current Sensors ...................................................... 29 7. Ordering Information ......................................... 29 PAGE 8 Warranty ...............................................................30 9 Test Procedures ....................................................31 9.1 Resistor-Fault Tests ................................................31 9.1.1 Calibration and Open Test ..........................31 9.1.2 Voltage Test ...............................................31 9.2 Sensing-Resistor Test .............................................31 9.3 Analog-Output Test ................................................31 9.4 Ground-Fault Performance Test .............................32 LIST OF FIGURES FIGURE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 PAGE Configuration Switches ............................................3 Analog-Output Connections .....................................6 SE-330 Connection Diagram ....................................7 SE-330 Outline and Panel-Mounting Details ...........8 SE-330 Outline and Surface-Mounting Details ........9 SE-IP65CVR-G Weatherproof Cover Outline .......10 SE-IP65CVR-G Weatherproof Cover Installation .11 ER-600VC Sensing Resistor ..................................12 SE-MRE-600 Moisture-Resistant Enclosure Outline 13 SE-MRE-600 with installed ER-600VC...................14 ER-5KV Sensing Resistor ......................................15 ER-5WP Sensing Resistor ......................................16 ER-15KV Sensing Resistor ....................................17 ER-25KV Sensing Resistor ....................................18 ER-35KV Sensing Resistor ....................................19 EFCT-1 Ground-Fault Current Sensor ...................21 SE-CS30-70 Ground-Fault Current Sensor ............22 EFCT-26 and SE-CS30-26 GroundFault Current Sensors .........................................23 RK-332 Remote Indication and Reset ....................24 Simplified Isolated-Ground Connection .................24 Simplified Pulsing Connection ...............................25 Ground-Fault-Test Circuits ....................................33 LIST OF TABLES TABLE 1 2 3 4 PAGE Typical Values for Tripping Systems .......................3 Ground-Fault Trip Levels for Selected CT’s ............3 RS-232 DB-9 Terminals .........................................25 Ground-Fault-Test Record......................................33 DISCLAIMER Specifications are subject to change without notice. Littelfuse Startco is not liable for contingent or consequential damages, or for expenses sustained as a result of incorrect application, incorrect adjustment, or a malfunction. SE-330 Neutral-Grounding-Resistor Monitor 1. GENERAL 1.1 MODERN RESISTANCE-GROUNDED SYSTEMS A high-resistance-grounded system uses a neutralgrounding resistor (NGR) with a low let-through current to limit ground-fault current. This is an improvement over low-resistance or solidly-grounded systems because, in those systems, a ground-fault flash hazard exists and a ground fault can result in substantial point-of-fault damage. High-resistance grounding eliminates these problems and modern ground-fault protection operates reliably at low current levels. Furthermore, the probability of an arc-flash incident is significantly reduced in a high-resistance-grounded system. NGR selection depends on system charging current and whether the system is an alarm-only or a tripping system. Alarm-only systems are usually restricted to system voltages up to 5 kV with NGR let-through currents of 5 A or less. Occasionally, alarm-only systems up to 15 kV and up to 10 A are used; however, they are not common because a ground fault on such a system tends to escalate to a phase-to-phase fault before the ground fault can be located and cleared. System charging current is the capacitive current that flows to ground when a bolted ground fault occurs. This current can be calculated or measured. For small systems, the magnitude of charging current can be conservatively estimated as ½ A per 1,000 kVA on low-voltage systems and 1 A per 1,000 kVA on medium-voltage systems. In an alarm-only system or in a tripping system without selective coordination, choose an NGR with a let-through current larger than the system charging current and set the pick-up current of ground-fault devices at or below 50% of the NGR let-through current. In a tripping system with selective coordination, use ground-fault devices with a definite-time characteristic to achieve time coordination. Use the same pick-up current for all ground-fault devices—this value must be larger than the charging current of the largest feeder. Select an NGR with a let-through current between five and ten times the pick-up current of the ground-fault devices. Do not use a grounding transformer with a low-voltage resistor: The combined cost of a transformer and a lowvoltage resistor is more than the cost of a resistor rated for line-to-neutral voltage. A transformer saturated by a ground fault through a rectifier can make ground-fault protection inoperative. Transformer inrush current up to twelve times rated current can cause a ground-fault voltage larger than expected. A parallel transformer winding makes it difficult to monitor NGR continuity. A transformer can provide the inductance necessary to cause ferroresonance if the NGR opens. Page 1 Rev. 9-A-112913 Following these guidelines will reduce the flash hazard, reduce point-of-fault damage, achieve reliable groundfault protection, and ensure a stable system not subject to ferroresonance. 1.2 SE-330 NGR MONITORING The SE-330 is a microprocessor-based neutralgrounding-resistor monitor that detects NGR failures and ground faults in resistance-grounded systems. The SE-330 measures NGR resistance, NGR current, and transformer or generator neutral-to-ground voltage. The components required to monitor an NGR are an SE-330, a 20- or 100-k ER-series sensing resistor, and a current transformer (CT). Power-circuit elements, other than neutral-connected NGR’s, that purposefully connect the power system to ground are often not compatible with SE-330 NGR monitoring. These elements include single-phase grounding transformers, grounded-wye-primary PT’s, and grounded-wye-primary power transformers. The SE-330 continuously measures NGR resistance in an unfaulted system, and it will trip on resistor fault if NGR resistance varies from its calibrated value. When a ground fault occurs, voltage is present on the neutral and NGR current will flow if the NGR is healthy. The SE-330 will trip on ground fault if fault current exceeds the GF TRIP LEVEL setting for an interval equal to the GF TRIP TIME setting. However, if the NGR fails open during a ground fault, it is possible for fault resistance to satisfy the NGR resistance measurement. To detect this double-fault condition, the SE-330 measures neutral voltage. If neutral voltage exceeds the VN TRIP LEVEL setting, and if NGR current is less than 5% of the CT rating, the SE-330 will trip on resistor fault. If the resistor-fault circuit is tripped and the neutral voltage exceeds the VN TRIP LEVEL setting for an interval greater than the GF TRIP TIME setting, the ground-fault circuit will also trip. Ground-fault current is sensed by a CT with a 1- or 5-A secondary, or by a sensitive CT (EFCT-x or SE-CS30-x) with a 50-mA secondary. The trip level of the ground-fault circuit is adjustable from 2 to 100% of the CT rating and trip time is adjustable from 0.1 to 10.0 seconds. The SE-330 has four output relays. Relay K1 can be assigned a trip or a pulsing function. Relays K2 and K3 provide ground-fault and resistor-fault indication. K4 is a solid-state relay that provides UNIT HEALTHY indication. When relay K1 is assigned the trip function, it will operate on either a resistor fault or ground fault, and it can be set to operate in the fail-safe or non-fail-safe mode for undervoltage or shunt-trip applications. When the pulsing function is selected, relay K1 is used to control a contactor to assist in fault location. SE-330 Neutral-Grounding-Resistor Monitor Additional features include LED trip indication, trip memory, front-panel and remote reset, 4–20-mA analog output, RS-232 local communications, data logging, and optional network communications. The SE-330 provides additional features and improved performance over the SE-325 NGR Monitor: SE-330 dc rejection is sufficient for reliable operation in overhead-line applications. Digital filtering of voltage and current signals minimizes false trips due to harmonics. Resistance measurement is calibrated to the NGR to achieve a lower trip resistance. Broader setting ranges. Independent ground-fault and resistor-fault relays can be used for indication and control. Universal power supply. Wider CT-selection range. Network communications options provide information to a distributed control system. 4–20 mA analog output. UNIT HEALTHY output contact. Power-up trip memory. Pulsing capability can be used on low- and mediumvoltage systems to assist in locating ground faults. RS-232 local communications port for firmware upgrades and access to SE-330 measured parameters. 2. OPERATION 2.1 SETTINGS 2.1.1 GF TRIP TIME GF TRIP TIME (definite time) is adjustable from 0.1 to 10.0 seconds. Time-coordinated ground-fault protection requires this setting to be longer than the trip times of downstream ground-fault devices. A trip-time accumulator provides a ground-fault memory function for detection of intermittent faults. The accumulated time increases when a ground fault is detected and decreases when a ground fault is not detected. A trip will eventually occur when the time for fault current above the trip level is greater than the time for fault current below the trip level. Page 2 Rev. 9-A-112913 2.1.2 GF TRIP LEVEL The SE-330 uses a Discrete-Fourier Transform (DFT) algorithm to measure the fundamental component of NGR current. Choose an NGR let-through current and a ground-fault trip level according to the guidelines in Section 1.1. Set the ground-fault trip level as a percentage (2, 4, 6, 8, 10, 15, 20, 40, 60, 80, or 100) of the CT-primary rating. Inputs are provided for 5-, 1-, and 0.05-A-secondary CT’s. Typical values for 5-, 15-, and 25-A tripping systems are shown in Table 1. Ground-fault trip levels for selected CT’s are shown in Table 2. For other systems, refer to the NGR Monitor Set-Point Assistant at www.littelfuse.com/protectionrelays. 2.1.3 VN TRIP LEVEL The SE-330 uses a DFT algorithm to measure the fundamental component of neutral voltage. Calculate the voltage across the NGR when NGR current is equal to the pick-up current of the ground-fault circuit. Set the VN TRIP LEVEL at the next largest value. The VN TRIP LEVEL range is 20 to 2,000 V with switch S5 in the 20-k (Vx1) position, and the range is 100 to 10,000 V with switch S5 in the 100-k (Vx5) position. See Fig. 1 and Section 2.1.5.5. If neutral voltage is greater than the VN TRIP LEVEL setting for 12 seconds and ground-fault current is less than 5% of the CT rating, the SE-330 will trip on resistor fault. If the resistor-fault circuit is tripped and the neutral voltage exceeds the VN TRIP LEVEL setting for an interval greater than the GF TRIP TIME setting, the ground-fault circuit will also trip. Typical values for 5-, 15-, and 25-A tripping systems are shown in Table 1. For an NGR resistance greater than 2 k, use a 100-k sensing resistor. For other systems, refer to the NGR Monitor Set-Point Assistant at www.littelfuse.com/protectionrelays. NOTE: A resistor-fault trip is held off if the ground-fault current is above 5% of the CT rating. Page 3 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor TABLE 1. TYPICAL VALUES FOR TRIPPING SYSTEMS System Voltage (Volts) 480 600 2,400 4,160 480 600 2,400 4,160 7,200 14,400 4,160 7,200 14,400 25,000 35,000 Neutral-Grounding Resistor Current Resistance (Amperes) (Ohms) 5 55 5 69 5 277 5 480 15 18 15 23 15 92 15 160 15 277 15 554 25 96 25 166 25 332 25 577 25 808 Model ER-600VC ER-600VC ER-5KV ER-5KV ER-600VC ER-600VC ER-5KV ER-5KV ER-15KV ER-15KV ER-5KV ER-15KV ER-15KV ER-25KV ER-35KV Sensing Resistor Resistance (Switch S5 Setting) 20 k 20 k 20 k 20 k 20 k 20 k 20 k 20 k 100 k 100 k 20 k 100 k 100 k 100 k 100 k Ground-Fault Trip Level VN Trip Level (Amperes) 1.0 1.0 1.0 1.0 3.0 3.0 3.0 3.0 3.0 3.0 5.0 5.0 5.0 5.0 5.0 (Volts) 60 100 340 800 60 100 340 800 170x5=850 340x5=1,700 800 170x5=850 340x5=1,700 800x5=4,000 1,200x5=6,000 200:1 200:5 (Amperes) * * 12 16 20 30 40 80 120 160 200 400:1 400:5 (Amperes) * 16 24 36 40 60 80 160 240 320 400 TABLE 2. GROUND-FAULT TRIP LEVELS FOR SELECTED CT’S GF TRIP LEVEL (%) 2 4 6 8 10 15 20 40 60 80 100 EFCT-x 5:0.05 (Amperes) 0.10 0.20 0.30 0.40 0.50 0.75 1.00 2.00 3.00 4.00 5.00 * Setting not recommended. SE-CS30-x 30:0.05 (Amperes) 0.60 1.20 1.80 2.40 3.00 4.50 6.00 12.0 18.0 24.0 30.0 50:1 50:5 (Amperes) * * * * 5 7.5 10 20 30 40 50 2.1.4 PULSE-PERIOD ADJUSTMENT Pulse period is the cycle time of relay K1 when the SE-330 is configured for pulsing operation. Pulse period is adjustable from 1.0 to 3.0 seconds with a fixed duty cycle of 50%. For example, with the 1.0-s setting, relay K1 will alternately be energized for 0.5 seconds and deenergized for 0.5 seconds when pulsing is enabled. NOTE: For pulsing configuration, set switch S1 to K1 = PULSING and install an external pulse-enable switch. 2.1.5 CONFIGURATION SETTINGS Eight configuration switches (S1 to S8) and a calibration push button are located behind the access cover on the front panel. See Fig. 1. 100:1 100:5 (Amperes) * * * 8 10 15 20 40 60 80 100 CALBIRATION PUSH BUTTON K1 = TRIP FAIL-SAFE S1 K1 = PULSING S2 NON-FAIL-SAFE LATCHING GF TRIP S3 NON-LATCHING GF TRIP LATCHING RF TRIP S4 NON-LATCHING RF TRIP 20 kΩ S5 100 kΩ 50 Hz S6 60 Hz SPARE RUN S7 S8 UPGRADE NOTE: DEFAULT SETTINGS SHOWN. FIGURE 1. Configuration Switches. SE-330 Neutral-Grounding-Resistor Monitor 2.1.5.1 RELAY K1 FUNCTION (S1) Set switch S1 to K1 = TRIP to assign the trip function to relay K1 and to activate switch S2. Relay K1 will change state when a resistor-fault or ground-fault trip occurs. Set switch S1 to K1 = PULSING to configure relay K1 for pulsing operation. See Section 2.3. 2.1.5.2 TRIP-RELAY MODE AND TRIP MEMORY MODE (S2) Set switch S2 to select the operating mode of trip relay K1. In the non-fail-safe mode, relay K1 energizes and its contact closes when a trip occurs. The non-fail-safe mode can be used to trip shunt-trip circuit breakers. In the nonfail-safe mode, SE-330 trips are reset when supply voltage is cycled. In the fail-safe mode, relay K1 energizes and its contact closes if there are no trips. Contacts open if there is a trip, a loss of supply voltage, or a processor failure. In the failsafe mode, SE-330 trips are not reset when supply voltage is cycled. NOTE: Switch S2 does not affect the operating modes of relays K2, K3, and K4. NOTE: Switch S2 only affects relay K1 operating mode when K1 is assigned the trip function (switch S1 set to K1 = TRIP). Switch S2 defines SE-330 trip memory regardless of the switch S1 setting. 2.1.5.3 GROUND-FAULT-TRIP LATCH (S3) Set switch S3 to select latching or non-latching groundfault-circuit operation. Non-latching operation defeats ground-fault-trip memory. See Sections 2.1.5.2 and 2.4. 2.1.5.4 RESISTOR-FAULT-TRIP LATCH (S4) Set switch S4 to select latching or non-latching resistor-fault-circuit operation. Non-latching operation defeats resistor-fault-trip memory. See Sections 2.1.5.2 and 2.4 2.1.5.5 SENSING-RESISTOR SELECTION (S5) Set switch S5 to the resistance of the sensing resistor. For the ER-600VC and ER-5KV, select 20 k. For the ER-15KV, ER-25KV, and ER-35KV, select 100 k. Switch S5 sets the resistor-fault trip value and the VN TRIP LEVEL range. See Section 2.1.3. 2.1.5.6 FREQUENCY (S6) Set switch S6 to 50 or 60 Hz to tune the digital filter to the line frequency of the monitored system. 2.1.5.7 SPARE (S7) 2.1.5.8 UPGRADE ENABLE (S8) Set switch S8 to RUN for normal operation or to UPGRADE to enable firmware upgrades. Changes in switch S8 settings are recognized only when supply Page 4 Rev. 9-A-112913 voltage is cycled. Protection is disabled after supply voltage is cycled with S8 in the UPGRADE position. See Section 4.1.3. 2.2 CALIBRATION The SE-330 measures the resistance change of the NGR relative to the NGR-resistance value determined at the time of calibration. Calibrate the SE-330 on new installations, if the NGR is changed, or if the sensing resistor is changed. NOTE: If the SE-330 is not calibrated and is supplied from the load side of the breaker (non-fail-safe mode), calibrate within 12 seconds of power-up or it may trip and interrupt its supply. The CALIBRATION push button is located behind the access cover on the front panel, and it is recessed to prevent inadvertent activation. NOTE: Calibration must be performed with the SE-330 connected to the sensing resistor and NGR of the installed system. To calibrate, press and hold the CALIBRATION push button until the green CALIBRATED LED turns off and returns to on (if the LED is already off, press and hold until the LED turns on). Calibration takes approximately two seconds. If calibration is not successful, a resistorfault trip occurs, the RESISTOR FAULT TRIP LED will be on, the CALIBRATED LED will be off, and the DIAGNOSTIC LED will flash the calibration-error code. See Section 2.8. If latching resistor fault (switch S4) is selected, the calibration-error code flashes until RESET is pressed even if the CALIBRATED LED is on. The calibration value is stored in non-volatile memory. 2.3 PULSING OPERATION If switch S1 is set to K1 = PULSING, pulsing occurs when terminal 16 is connected to terminal 17. Relay K1 operates at a 50% duty cycle and cycle time is adjustable from 1.0 to 3.0 seconds. When terminals 16 and 17 are not connected, K1 is not energized and its contact is open. Relay K1 can be used to control a contactor rated for use at the line-to-neutral voltage. The contactor causes changes in neutral-to-ground resistance by adding or shorting portions of the NGR. See Section 3.5. Pulsing ground-fault current appears as zero-sequence current upstream from the fault. Pulsing ground-fault current is distinguishable from charging current and noise, and it can be traced with a clip-on ammeter or current probe. If pulsing current is detected on a cable or conduit, the fault is downstream. Systematic testing allows faults to be located without isolating feeders or interrupting loads. If the fault is on a conduit system with a complex mix of cables and ground points, the exact location of the ground fault may be difficult to determine. Stop pulsing when the fault is located. SE-330 Neutral-Grounding-Resistor Monitor 2.4 TRIP INDICATION AND RESET Red LED's and indication relays indicate ground-fault and resistor-fault trips—indication relays K2 and K3 are energized on trip. When a trip occurs with latching operation selected, the SE-330 remains tripped until reset. See Sections 2.1.5.3 and 2.1.5.4. Terminals 15 and 16 are provided for remote reset as shown in Fig. 3. The reset circuit responds only to a momentary closure so that a jammed or shorted switch does not prevent a trip. The front-panel RESET switch is inoperative when terminal 15 is connected to terminal 16. If non-latching operation is selected, trips and corresponding indication automatically reset when the fault clears and power-up trip memory is defeated even when configuration switch S2 is set to fail-safe. Automatic reset time is 2.8 s, maximum. The red DIAGNOSTIC LED annunciates latched calibration-error and remote trips. See Section 2.8. When supply voltage is applied with switch S2 set to FAIL-SAFE, the SE-330 returns to its state prior to loss of supply voltage unless switch S3 or S4 is set to nonlatching. When supply voltage is applied with switch S2 set to NON-FAIL-SAFE, SE-330 trips are reset. When a local, remote, or network reset is issued, both trip LED's will flash if they are off. Resistor-fault-trip reset can take up to one second. Resistor-fault trip-memory trip can take up to three seconds after SE-330 power up. 2.5 REMOTE OPERATION Relays K2 and K3 can be used for remote indication, and terminals 15 and 16 are provided for remote reset. RK-332 Remote Indication and Reset components are shown in Fig. 19. Connect them as shown in Fig. 3. RK-332 components are not polarity sensitive. Network-enabled SE-330’s can be remotely tripped and reset by the network master. The red DIAGNOSTIC LED indicates a network-initiated trip. See Section 2.8. Refer to the appropriate SE-330 communications manual. 2.6 RELAY K1 LED The yellow RELAY K1 LED follows the state of relay K1 and is on when K1 is energized (contact closed). 2.7 UNIT HEALTHY OUTPUT UNIT HEALTHY relay K4 is energized when the processor is operating. It can be ordered with N.O. or N.C. contacts. See Section 7. NOTE: The K4 output changes state momentarily during a processor reset. NOTE: K4-contact rating is 100 mA maximum. Page 5 Rev. 9-A-112913 2.8 DIAGNOSTIC LED The DIAGNOSTIC LED is used to annunciate trips without individual LED indication. The number of short LED pulses between pauses indicates the cause of the trip. Calibration-Error Trip (1 short): The calibration resistance of the NGR is outside the calibration range. See Section 6.1. Remote Trip (2 short): The SE-330 has been tripped by a remote-trip command from the communications interface. EEPROM-Error Trip (3 short): An EEPROM error has been detected. A/D-Converter-Error Trip (4 short): An A/D-converter error has occurred. Software-Interrupt Trip (5 short): CPU reset was caused by a software interrupt. Illegal-Opcode Trip (6 short): CPU reset was caused by an illegal Opcode. Watchdog Trip (7 short): CPU reset was caused by the watchdog. Clock-Failure Trip (8 short): CPU reset was caused by an internal clock failure. CPU Trip (9 short): This code is displayed if the supply is cycled after one of the previous four errors occurred. Resistor-fault trips occur with all of the above trips. Ground-fault trips occur with all of the above trips except the calibration-error trip and the A/D-converter-error trip. See Troubleshooting Section 5. SE-330 Neutral-Grounding-Resistor Monitor 2.9 ANALOG OUTPUT An isolated 4–20-mA output indicates NGR current with full-scale output corresponding to the CT rating. An internal 24-Vdc supply allows the analog output to be connected as a self-powered output. Power from an external supply is required for loop-powered operation. See Fig. 2. +24V 18 + 19 - 20 0V 21 SELF-POWERED +24V 18 + + 19 - 20 0V 21 LOOP SUPPLY LOOP POWERED FIGURE 2. Analog-Output Connections. Page 6 Rev. 9-A-112913 3. INSTALLATION 3.1 SE-330 Outline and panel-cutout dimensions for the SE-330 are shown in Fig. 4. To panel mount the SE-330, insert it through the panel cutout and secure it with four 8-32 locknuts and flat washers (included). If an optional SE-IP65CVR-G Hinged Cover is used, follow the included installation instructions. See Figs 6 and 7. All connections to the SE-330 are made with plug-in, wire-clamping terminal blocks. Each plug-in terminal block can be secured to the monitor by two captive screws for reliable connections. Outline dimensions and mounting details for surface mounting the SE-330 are shown in Fig. 5. Fasten the surface-mount adapter to the mounting surface and make connections to the adapter terminal blocks. Follow Fig. 5 instructions to mount or remove the SE-330. Ground terminal 7 (G) and connect terminal 6 (R) to the sensing-resistor R terminal. Use terminal 1 (L1) as the line terminal on ac systems, or the positive terminal on dc systems. Use terminal 2 (L2/N) as the neutral terminal on ac systems or the negative terminal on dc systems. Connect terminal 3 ( ) to ground. Connect terminal 4 (SPG) to terminal 5 (SPGA). Remove the terminal-4-to-5 connection for dielectric-strength testing. NOTE: When the terminal-4-to-5 connection is removed, protective circuits inside the SE-330 are disconnected to allow dielectric strength testing of a control panel without having to disconnect wiring to the SE-330. Ensure that the terminal-4-to-5 connection is replaced after testing. Page 7 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor TRANSFORMER OR GENERATOR NOTE 1 NOTE 12 XXX:1 OR NOTE 2 NOTES 11 & 12 XXX:5 EFCT-X OR SE-CS30-X NOTE 3 N 8 S 9 1 10 5 11 8 C 9 S ER-SERIES SENSING RESISTOR 10 11 5 1 NOTE 4 R G 1 NOTE 6 L2/N L1 K1 22 6 7 25 K3 28 K4 12 NOTE 14 REMOTE RESET PULSE ENABLE NC 15 17 19 RESET - 20 RESISTOR FAULT 0V 21 NOTE 8 SELF POWERED 4-20 mA OUTPUT PULSE ENABLE DCD DSR 5 GROUND FAULT 18 + 3 4 NOTES: 13 UNIT HEALTHY NOTE 7 +24V ANALOG OUTPUT 16 C 27 RF 14 NOTE 13 & 14 24 GF 29 NOTE 5 N/- SUPPLY 2 23 K2 26 SPG CTS SPGA RxD TxD 1. USE SEPARATE LUG TO CONNECT SENSINGRESISTOR TERMINAL N TO NEUTRAL. 2. LOCATE THESE COMPONENTS NEAR TRANSFORMER OR GENERATOR. 3. ALTERNATE SENSING-RESISTOR TERMINAL-N CONNECTION. THE NEUTRAL CONNECTION IS NOT MONITORED. 4. VOLTAGE BETWEEN SENSING-RESISTOR TERMINALS R AND G IS LIMITED TO 100 V BY INTERNAL CLAMP. 5. SEE SECTION 3.4 FOR ISOLATED-RESISTOR CONNECTION. 6. RELAY CONTACTS SHOWN WITH SE-330 DE-ENERGIZED. 1 7. OPTIONAL N.C. K4 AVAILABLE. 6 8. LOOP-POWERED CONNECTION USES TERMINALS 19 AND 20 ONLY. 8 5 OPTIONAL NETWORK COM NOTE 10 G R ALTERNATE CT CONNECTIONS L/+ SUPPLY NGR C 5A 1A EFCT SE-330 NEUTRAL 2 3 RS232 COM NOTE 9 9. RS232 PIN 4 (DTR), PIN 7 (RTS) AND PIN 9 (RI) NOT CONNECTED. 10. REFER TO APPROPIATE SE-330 COMMUNICATIONS INTERFACE MANUAL. 11. TWO-CONDUCTOR TWISTED CABLE REQUIRED. SHIELDED OR ARMOURED RECOMMENDED. 12. CT CONNECTION IS NOT POLARITY SENSITIVE. SE-330 13. CONNECT CONTACTS K1, K2, K3, AND K4 AS REQUIRED FOR PROTECTION, INDICATION, AND CONTROL. 14. EXTERNAL LIGHTS AND SWITCHES NOT INCLUDED WITH SE-330. FIGURE 3. SE-330 Connection Diagram. Page 8 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor 16.0 132.0 (5.20) (0.63) 98.3 PANEL THICKNESS 1.6 (0.06) TO 4.8 (0.19) (3.87) LITTELFUSE STARTCO NEUTRAL-GROUNDING-RESISTOR MONITOR GROUND FAULT SE-330 RESISTOR FAULT DIAGNOSTIC TRIP 1 2 3 4 5 CALIBRATED 15 20 40 60 4 80 2 100 GF TRIP LEVEL (% CT RATING) 0.5 0.7 1.0 0.4 0.3 0.2 0.1 2.0 3.0 5.0 10.0 GF TRIP TIME (s) POWER 170 130 100 200 340 800 1200 60 1700 20 2000 VN TRIP LEVEL (S5 CAL 1 2 3 4 5 6 7 8 20 K Ω VN x 1 185.4 (7.30) 10 212.6 (8.37) RELAY K1 8 6 12 13 NC - 14 15 RESET 16 PULSE ENABLE 17 + 24V - 18 + - 19 ANALOG OUTPUT - - 20 0V - 2 1 UNIT HEALTHY K4 TRIP 100 K Ω ) VN x 5 1.8 2.0 2.2 1.6 2.4 1.4 2.6 1.2 2.8 1.0 3.0 - L1 L2/N SPG SPGA ATTENTION DISENGAGE CAPTIVE RETAINING S C R E W S BE F O R E R E M O V I N G P L U G -I N T ER M I NA L B LO CK S 6 - R 7 - G SENSING RESISTOR PULSE PERIOD (s) 8 9 10 11- RESET FRONT VIEW SIDE VIEW NOTE 2 S E 1 F 5 5 A1 C T C A GROUND FAULT K2 RESISTOR FAULT K3 K1 22 23 24 25 26 27 28 29 REAR VIEW 92.7 (3.65) 8.2 (0.32) 76.2 (3.00) 186.0 (7.32) 200.0 (7.87) NOTES: 4.75 (0.187) DIA 4 LOCATIONS 7.0 (0.28) R=4.8 (0.19) MAXIMUM PANEL-MOUNT CUTOUT FIGURE 4. SE-330 Outline and Panel-Mounting Details. 1. DIMENSIONS IN MILLIMETRES (INCHES). 2. SE-330 SHOWN WITHOUT SWITCH ACCESS COVER. Page 9 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor 114.3 8.0 (0.31) RETAINER SCREW RETAINER 6.4 (0.25) (4.50) 98.3 (3.87) 138.0 (5.43) LITTELFUSE STARTCO NEUTRAL-GROUNDING-RESISTOR MONITOR GROUND FAULT RESISTOR FAULT DIAGNOSTIC TRIP L1 - 1 L2/N - 2 - 3 SPG - 4 SPGA - 5 15 20 40 60 80 2 100 GF TRIP LEVEL (% CT RATING) 0.5 0.7 1.0 POWER R - 6 G - 7 2.0 3.0 5.0 10.0 (S5 CAL GF TRIP TIME (s) GROUND FAULT K2 RESISTOR FAULT K3 S - 8 E 1 - 9 F C 1 T A 5 5 -1 0 A C -1 1 340 800 1200 20 K Ω VN x 1 100 K Ω ) VN x 5 1.8 2.0 2.2 1.6 2.4 1.4 2.6 1.2 2.8 1.0 3.0 6 7 PULSE PERIOD (s) 8 9 10 11 RESET FRONT VIEW SE-330-SMA 25.4 (1.00) 200 60 1700 20 2000 VN TRIP LEVEL FRONT VIEW 63.5 (2.50) SIDE VIEW 5.0 (0.20) 24 25 26 27 28 29 SENSING RESISTOR 0.4 0.3 0.2 0.1 170 130 100 225.4 (8.87) RELAY K1 10 4 K1 1 2 3 4 5 CALIBRATED 8 6 22 23 TRIP 212.6 (8.37) 12 NIT K4 U HEALTHY 13 14 - NC 15 RESET 16 PULSE ENABLE 17 18 - + 24V 19- + ANALOG OUTPUT 20 - 2 1 - 0V SE-330 NOTES: 1. DIMENSIONS IN MILLIMETRES (INCHES). (NOTE 2) 2. MOUNTING SCREWS: M4 OR 8-32 PANHEAD. INSTALLATION 215.9 (8.50) 1. LOOSEN RETAINER SCREWS, MOVE RETAINERS OUTWARD AND TIGHTEN RETAINER SCREWS. 2. MATE MONITOR WITH ADAPTER PLUG-IN TERMINALS. LOOSEN RETAINER SCREWS TO LET RETAINERS SNAP OVER MONITOR BACKPLATE. 3. ENSURE THAT RETAINERS ARE AGAINST MONITOR BODY AND TIGHTEN RETAINER SCREWS. REMOVAL 1. LOOSEN RETAINER SCREWS, SLIDE RETAINERS AWAY FROM MONITOR BODY AND TIGHTEN RETAINER SCREWS. BEZEL OUTLINE 2. PULL MONITOR FORWARD. ADAPTER PANEL OUTLINE MOUNTING DETAIL FIGURE 5. SE-330 Outline and Surface-Mounting Details. Page 10 Rev. 9-A-112913 TO PREVENT UNAUTHORIZED ENTRY: (1.34) 34.0 SE-330 Neutral-Grounding-Resistor Monitor 1. USE WIRE SEAL THROUGH HOLES IN WEATHERPROOF COVER ASSEMBLY, OR 2. SECURE WITH THE PLASTIC THREAD FORMING SCREW SUPPLIED IN KIT. SHOWN WITH SEAL (9.84) 250.0 TOP VIEW HOLE FOR SEAL WIRE 127.0 (5.00) FRONT VIEW NOTES: 1. DIMENSIONS SHOWN IN MILLIMETRES (INCHES). 2. SHOWN WITH WEATHERPROOF SNAPS CLOSED. 3. REFER TO PANEL MOUNTING CUTOUT (FIGURE 4) FOR PANEL MOUNTING DETAIL. FIGURE 6. SE-IP65CVR-G Weatherproof Cover Outline SIDE VIEW Page 11 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor INSTALL O-RING INTO GROOVE IN THE REAR OF WEATHERPROOF WINDOW INSERT MONITOR/RELAY THROUGH OPENING OF THE WEATHERPROOF WINDOW, UNTIL IT IS SECURELY NESTED TO THE BACK OF THE DARK GREY PVC PANEL. INSTALL O-RING INTO THE GROOVE IN THE REAR OF WEATHERPROOF WINDOW ASSEMBLY. INSERT ASSEMBLY INTO PANEL AND FAST WITH THE HARDWARE PROVIDED WITH MONITOR/RELAY. FIGURE 7. SE-IP65CVR-G Weatherproof Cover Installation Page 12 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor If a ground fault in the sensing-resistor conductor is unlikely, a minimal loss of protection will result if it does not pass through the ground-fault-CT window. See Note 3 in Fig. 3. 3.2 SENSING RESISTOR Outline and mounting details for ER-600VC, ER-5KV, ER-5WP, ER-15KV, ER-25KV, and ER-35KV sensing resistors are shown in Figs.8, 11, 12, 13, 14, and 15. Locate the NGR and the sensing resistor near the transformer or generator. When located outdoors, a sensing resistor must be installed in a suitable enclosure. An optional SE-MRE-600 Moisture-Resistant Enclosure is available for applications which may expose an ER600VC to moisture. See Figs. 9 and 10. The weatherprotected ER-5WP shown in Fig. 12 is an ER-5KV with moisture-resistant terminal covers. Use an ER-5WP in applications in which it might be exposed to moisture. The ER-15KV, ER-25KV, and ER-35KV include moisture-resistant terminal covers. Use suitable watertight fittings. Ground sensing-resistor terminal G. Pass the sensing-resistor-to-neutral conductor and the NGR-toneutral conductor through the ground-fault-CT window as shown in Fig. 3. Separately connect sensing-resistor terminal N and the NGR to the neutral to include neutral connections in the monitored loop. Alternately, if the NGR connection to system neutral need not be monitored, connect terminal N to the NGR neutral terminal. CAUTION: Voltage at terminal N rises to line-to-neutral voltage when a ground fault occurs. The same clearances are required for sensing resistors as for NGR’s. NOTE: A parallel ground path created by moisture can result in a false resistor-fault trip. Sensing-resistor terminal R and its connection to SE-330 terminal R, including interposing terminal blocks, must remain dry. The neutral-to-sensing-resistor-terminal-N NOTE: connection is not a neutral conductor as defined in Canadian Electrical Code Section 10-1108 and National Electrical Code Section 250.36(B). It is not required to be 8 AWG or larger. Since current through this conductor is always less than 250 mA, a 14 AWG conductor insulated to the system voltage is more than sufficient. RATINGS: MAXIMUM VOLTAGE . 600 Vac MAXIMUM CURRENT . 30 mA RESISTANCE . . . . . . . 20 kΩ THERMAL: 600 Vac . . . . . . . . . . 6 MINUTES ON, 60 MINUTES OFF 420 Vac . . . . . . . . . . CONTINUOUS 41.5 40.0 (1.63) (1.57) 89.0 (3.50) (0.31) (4.13) 105.0 4.5 (0.18) DIA C’BORE 10.0 (0.39) DIA 3.2 (0.13) DEEP FRONT 8.0 Use with: Duty Cycle: R LR 53428 US I E E E 3 2 ER-600VC Revision: 02 SENSI NG RES I STOR 2 0 KΩ 6 0 0 V AC M A X NOTE 3 C ER-600VC 1-800-TEC-FUSE (1-800-832-3873) Made in Saskatoon, Canada 105.0 G (4.13) R SENSING RESISTOR Serial No: GC131105487 Rating: N SE-325, SE-330, SE-330AU 10.5 (0.41) 600 Vac 50/60 Hz 30 mA Max 20 KΩ 19.0 (0.75) 6 Minutes On, 60 Minutes Off at 600 Vac Continuous at 420 Vac 10.5 (0.41) 8.0 22.2 (0.87) (0.31) 40.0 (1.57) SIDE MOUNTING DETAIL NOTES: 1. DIMENSIONS IN MILLIMETRES (INCHES). 2. TERMINAL-BLOCK SCREWS: 6-32 x 0.25. 3. MOUNTING SCREWS: M4 OR 8-32. 4. ON REVISION 2 UNITS ENCLOSURE IS ELECTRICALLY CONNECTED TO TERMINAL G THROUGH JUMPER FROM TERMINAL G TO SCREW. THIS CONNECTION MAY BE REMOVED FOR DIELECTRIC STRENGTH TESTING. ENSURE THAT THE JUMPER IS INSTALLED AFTER TESTING. 5. ON REVISION 1 UNITS, SCREW IS NOT PRESENT AND ENCLOSURE IS ELECTRICALLY CONNECTED TO TERMINAL G. 6. NOT ALL CERTIFICATIONS SHOWN. FIGURE 8. ER-600VC Sensing Resistor. Page 13 Rev. 9-A-112913 (4.80) 122.0 (4.80) 122.0 SE-330 Neutral-Grounding-Resistor Monitor GASKET 120.4 (4.74) 120.4 (4.74) ENCLOSURE - TOP VIEW COVER - INSIDE VIEW (COVER REMOVED) 122.0 (4.80) ENCLOSURE - TOP VIEW MOUNTING DETAIL 120.4 (4.74) 20.4 (0.80) NOTES: 84.6 (3.33) 1. DIMENSIONS IN MILLIMETRES (INCHES). 2. MOUNTING SCREWS: M6 OR 0.25-20. ENCLOSURE - SIDE VIEW FIGURE 9. SE-MRE-600 Moisture-Resistant Enclosure Outline. 82.5 120.4 (4.74) (13.25) M6 OR 0.25-20 19.1 82.5 (3.25) (0.75) 9.5 (0.38) Page 14 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor NOTE 2 MOUNTING SCREW LOCATIONS N R G NOTE 3 ER-600VC SENSI NG RES I STOR 2 0 KΩ 6 0 0 V AC M A X NOTE 2 ENCLOSURE - TOP VIEW COVER - INSIDE VIEW WITH INSTALLED ER-600VC (COVER REMOVED) ASSEMBLY INSTRUCTIONS 1. DRILL HOLE FOR ENCLOSURE WIRE ENTRY. USE LIQUID-TIGHT GLAND. 2. REMOVE NYLON NUTS AND WASHERS. INSERT ER-600VC INTO ENCLOSURE. REPLACE NUTS AND WASHERS. 3. ATTACH GROUND WIRE FROM ENCLOSURE TO COVER AND TO ER-600VC. 4. MOUNT SE-MRE-600 IN PLACE USING M6 OR 0.25 - 20. 5. COMPLETE OTHER WIRING AND REPLACE COVER. FIGURE 10. SE-MRE-600 with installed ER-600VC. Page 15 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor RATINGS: 381.0 (15.00) 21.0 (0.83) ALTERNATE NEUTRAL CONNECTION 12.0 NEUTRAL CONNECTION (0.47) E R - 5 KV S E NS IN G R E S I S TO R 2 0 KΩ 2500 VAC MAX CAUTION HIGH VOLTAGE VOLTAGE ON THIS SURFACE RISES TO LINE-TO-NEUTRAL VOLTAGE WHEN A GROUND FAULT OCCURS 7.9 (0.31) 52.5 (2.07) 105.0 (4.13) MAXIMUM VOLTAGE . 2,500 Vac MAXIMUM CURRENT. 125 mA RESISTANCE . . . . . . . 20 kΩ THERMAL . . . . . . . . . . CONTINUOUS TORQUE TERMINAL N (3 LOCATIONS) 10-32 INSERT. . . . . 5.6 N-m (50 in-lb) OTHERS . . . . . . . . . 9.0 N-m (80 in-lb) N 0.25-20 UNC THREADED INSERT N 10-32 THREADED INSERT N TOP VIEW 316.0 (12.44) 188.0 (7.40) 0.25-20 UNC STUD NOTE 2 RG NOTES 5 & 6 SIDE VIEW FRONT VIEW NOTES: MINIMUM DISTANCE TO ADJACENT OBJECTS NOTE 3 MINIMUM CLEARANCE FROM BASE 254.0 (10.00) 4. THIS DEVICE CAN DISSIPATE 300 WATTS. TO MINIMIZE SURFACE TEMPERATURES FOR SYSTEMS ALLOWED TO OPERATE CONTINUOUSLY WITH A GROUND FAULT, MOUNT VERTICALLY WITH R & G TERMINALS DOWN. 355.6 5. ON REVISION 2 UNITS BASE IS ELECTRICALLY CONNECTED TO TERMINAL G THROUGH JUMPER FROM TERMINAL G TO SCREW. THIS CONNECTION MAY BE REMOVED FOR DIELECTRIC STRENGTH TESTING. ENSURE THAT THE JUMPER IS INSTALLED AFTER TESTING. 6. ON REVISION 0 & 1 UNITS SCREW IS NOT PRESENT AND BASE IS ELECTRICALLY CONNECTED TO TERMINAL G. 7. CERTIFICATIONS NOT SHOWN. FIGURE 11. ER-5KV Sensing Resistor. 50.7 (2.00) (14.00) 457.0 (18.00) MOUNTING DETAIL 254.0 (10.00) 3. MOUNTING SCREWS: M6 OR 0.25-20. 127.0 2. TERMINAL-BLOCK SCREWS: 6-32 x 0.25. (5.00) 1. DIMENSIONS IN MILLIMETRES (INCHES). Page 16 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor RATINGS: MAXIMUM VOLTAGE . 2,500 Vac MAXIMUM CURRENT. 125 mA RESISTANCE . . . . . . . 20 kΩ THERMAL . . . . . . . . . . CONTINUOUS TORQUE TERMINAL N (3 LOCATIONS) 10-32 INSERT. . . . . 5.6 N-m (50 in-lb) OTHERS . . . . . . . . . 9.0 N-m (80 in-lb) ER-5WP S E NS IN G R E S I S TO R 2 0 KΩ 2500 VAC MAX CAUTION HIGH VOLTAGE VOLTAGE ON THIS SURFACE RISES TO LINE-TO-NEUTRAL VOLTAGE WHEN A GROUND FAULT OCCURS 7.9 (0.31) 52.5 (2.07) 105.0 (4.13) 381.0 (15.00) 21.0 (0.83) ALTERNATE NEUTRAL CONNECTION 12.0 NEUTRAL CONNECTION (0.47) N 0.25-20 UNC THREADED INSERT N 10-32 THREADED INSERT N TOP VIEW 316.0 (12.44) 188.0 (7.40) 0.25-20 UNC STUD NOTE 2 AND 5 SIDE VIEW FRONT VIEW NOTES: MINIMUM DISTANCE TO ADJACENT OBJECTS MINIMUM CLEARANCE FROM BASE 254.0 (10.00) 3. MOUNTING SCREWS: M6 OR 0.25-20. 4. THIS DEVICE CAN DISSIPATE 300 WATTS. TO MINIMIZE SURFACE TEMPERATURES FOR SYSTEMS ALLOWED TO OPERATE CONTINUOUSLY WITH A GROUND FAULT, MOUNT VERTICALLY WITH R & G TERMINALS DOWN. 5. BASE IS ELECTRICALLY CONNECTED TO TERMINAL G THROUGH JUMPER FROM TERMINAL G TO SCREW. THIS CONNECTION MAY BE REMOVED FOR DIELECTRIC STRENGTH TESTING. ENSURE THAT THE JUMPER IS INSTALLED AFTER TESTING. 6. CERTIFICATIONS NOT SHOWN. FIGURE 12. ER-5WP Sensing Resistor. 355.6 50.7 (2.00) (14.00) 457.0 (18.00) MOUNTING DETAIL (5.00) NOTE 3 254.0 (10.00) 2. TERMINAL-BLOCK SCREWS: 6-32 x 0.25 CABLE ACCESS OPENING IS 1/2 NPT. USE A LIQUID-TIGHT FITTING FOR CABLE ENTRY. 127.0 1. DIMENSIONS IN MILLIMETRES (INCHES). Page 17 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor 422.0 RATINGS: CAUTION HIGH VOLTAGE E R - 1 5 KV SENS IN G RESISTO R R 1 0 0 KΩ 84 0 0 V A C M A X 1 M I N UT E M A X G 132.0 (5.20) 144.0 (5.67) (16.61) N VOLTAGE AT TERMINAL N RISES TO LINE-TO-NEUTRAL VOLTAGE WHEN A GROUND FAULT OCCURS MAXIMUM VOLTAGE . . 8,400 Vac MAXIMUM CURRENT . 84 mA RESISTANCE . . . . . . . . 100 kΩ THERMAL 8,400 Vac . . . . . . . . . . 1 MINUTE ON, 120 MINUTES OFF 1,900 Vac . . . . . . . . . . CONTINUOUS NOTES 2 AND 4 0.25-20 BINDING HEAD 215.0 (8.46) TOP 20.5 (0.81) TORQUE TERMINAL N . . . . . . . . 9.0 N-m (80 in-lb) SIDE FRONT 444.0 (17.50) 365.0 (14.37) 90.0 (3.53) 39.5 (1.56) MINIMUM DISTANCE TO ADJACENT OBJECTS 39.5 (1.56) NOTES: 90.0 2. TERMINAL-BLOCK SCREWS: 6-32 x 0.25. NOTE 3 MINIMUM CLEARANCE FROM BASE 305.0 (12.00) 3. MOUNTING SCREWS: M6 OR 0.25-20. 4. USE LIQUID-TIGHT FITTING FOR TERMINAL-BLOCKENCLOSURE CABLE ENTRY. (3.53) 280.0 (11.00) 100.0 (3.94) 1. DIMENSIONS IN MILLIMETRES (INCHES). 5. CERTIFICATIONS NOT SHOWN. MOUNTING DETAIL FIGURE 13. ER-15KV Sensing Resistor. Page 18 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor 780.0 (30.70) 100 K Ω 1 4,4 00 V A C MA X 1 M I N UT E MA X R N 0.25-20 BINDING HEAD NOTES 2 AND 4 20.5 V O L T A G E A T T E R M I N A L N R I SE S TO LI NE-TO -N EUTRAL VO LT AGE WHEN A GR OUND FAULT O CCURS G (0.81) 144.0 (5.67) RATINGS: CAUTION CAUTION HIGH H I G HVOLTAGE VOLTAGE E R - 2 5 KV SE NS I NG R ES I ST OR 320.0 (12.60) TOP MAXIMUM VOLTAGE . 14,400 Vac MAXIMUM CURRENT. 144 mA RESISTANCE . . . . . . . 100 kΩ THERMAL 14,400 Vac . . . . . . . . . 1 MINUTE ON, 120 MINUTES OFF 2,500 Vac . . . . . . . . . CONTINUOUS TORQUE TERMINAL N . . . . . . . 9.0 N-m (80 in-lb) FRONT 60.0 (2.40) 800.0 (31.50) 340.0 (13.38) SIDE 340.0 (13.38) 217.0 (8.50) 534.0 (21.00) 100.0 (3.94) NOTES: 1. DIMENSIONS IN MILLIMETRES (INCHES). NOTE 3 2. TERMINAL-BLOCK SCREWS: 6-32 x 0.25. MINIMUM CLEARANCE FROM BASE 508.0 (20.00) MINIMUM DISTANCE TO ADJACENT OBJECTS 3. MOUNTING SCREWS: M6 OR 0.25-20 4. USE LIQUID-TIGHT FITTING FOR TERMINAL-BLOCKENCLOSURE CABLE ENTRY. 5. MOUNT AS SHOWN WITH BASE HORIZONTAL. 6. CERTIFICATIONS NOT SHOWN. MOUNTING DETAIL FIGURE 14. ER-25KV Sensing Resistor. Page 19 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor 20.5 132.0 (5.20) 1000.0 (39.40) CAUTION HIGH VOLTAGE E R - 3 5 KV S E N SIN G R E SIS TO R R 10 0 K Ω 22 , 2 0 0 V AC MA X 1 M I N UT E M AX N V OLTA GE AT TE RM INAL N RIS ES TO LINE- TO- NEUT R AL V OLTA GE W HEN A G ROUN D F AULT OCC URS G (0.81) RATINGS: MAXIMUM VOLTAGE . 22,000 Vac MAXIMUM CURRENT . 220 mA RESISTANCE . . . . . . . 100 kΩ THERMAL 22,000 Vac . . . . . . . . . 1 MINUTE ON, 120 MINUTES OFF 3,000 Vac . . . . . . . . . . CONTINUOUS TORQUE TERMINAL N . . . . . . . 9.0 N-m (80 in-lb) 0.25-20 BINDING HEAD NOTES 2 AND 4 459.0 (18.10) TOP FRONT SIDE 1600.0 (63.00) MINIMUM CLEARANCE FROM BASE 685.0 (27.00) 100.0 (3.90) 400.0 (15.70) 400.0 (15.70) NOTE 3 350.0 (13.80) 800.0 (31.50) 350.0 (13.80) MINIMUM DISTANCE TO ADJACENT OBJECTS MOUNTING DETAIL NOTES: 1. DIMENSIONS IN MILLIMETRES (INCHES). 2. TERMINAL-BLOCK SCREWS: 6-32 x 0.25. 3. MOUNTING SCREWS: M6 OR 0.25-20. 4. USE LIQUID-TIGHT FITTING FOR TERMINAL-BLOCK-ENCLOSURE CABLE ENTRY. 5. MOUNT AS SHOWN WITH BASE HORIZONTAL. 6. CERTIFICATIONS NOT SHOWN. FIGURE 15. ER-35KV Sensing Resistor. SE-330 Neutral-Grounding-Resistor Monitor 3.3 GROUND-FAULT CT Select and install a ground-fault CT that will provide the desired trip level. Typically, the CT-primary rating should approximately equal the NGR let-through-current rating. This provides an appropriate GF TRIP LEVEL setting range and analog-output scaling. See Section 2.1.2 and 2.9. Outline and mounting details for the sensitive EFCTand SE-CS30-series current sensors are shown in Figs. 16, 17, and 18. Ground-fault-CT connections and the typical ground-fault-CT location are shown in Fig. 3. For SE-325 replacement applications, the existing CT200 current transformer will typically have to be replaced. However, where replacement is not necessary or possible, the CT200 can be connected to either the 1or 5-A input. This CT has a 200:5 current ratio. If connected to the 1-A input, the ground-fault trip level will be a percentage of 40 A. See Section 2.1.2. The accuracy of a typical current transformer, including the CT200, decreases below 5% of its current rating. CT-primary current injection testing is recommended to verify trip levels below 5% of the CT-primary rating. See Section 9.4. Littelfuse Startco sensitive current sensors are designed for use at low levels and respond linearly to 2% current rating. NOTE: The current-transformer insulation class is of no consequence if its secondary is grounded and the conductors through its window are insulated for the system voltage. Medium-voltage systems may require a bushing-type CT. Page 20 Rev. 9-A-112913 Page 21 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor NOTES: 1. DIMENSIONS IN MILLIMETRES (INCHES). 2. MOUNTING SCREWS: M4 OR 8-32. P1 Ground Fault Sensing and Relaying Equipment 4FX9 E340889 3. PRESS MOUNTING FEET IN PLACE USING INSTALLATION TOOL PROVIDED. ® S1 S2 4. RoHS COMPLIANT. 5. EN 60044-1 COMPLIANT. 121.0 (4.76) 121.0 (4.76) 20.5 (0.81) 56.0 (2.21) 46.0 (1.81) 30.0 (1.18) 80.0 (3.15) NOTE 2 M5 SCREWS TOP MOUNTING DETAIL 25.0 (0.98) 30.0 (1.18) EFCT-1 EARTH FA ULT CT 600 V CLASS, INSULATION CLASS A R R LR 53428 5.0 (0.20) Ø RECESSED FOR 8-mm HEX NUT 1.0 (0.04) DEEP 22.0 (0.87) EFCT - 1FC FLUX CONDITIONER (OPTIONAL) .0 82 23) . 3 ( 69. (2.7 8 5) 126.0 (4.96) US (5.43) 138.0 MAX C 5.5 (0.22) 110.0 (4.33) FRONT FIGURE 16. EFCT-1 Ground-Fault Current Sensor. 5.5 (0.22) 56.0 (2.21) SIDE Page 22 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor P1 Ground Fault Sensing and Relaying Equipment 4FX9 E340889 ® S1 121.0 (4.76) S2 121.0 (4.76) 20.5 80.0 (3.15) 56.0 (2.21) 46.0 (1.81) 30.0 (1.18) (0.81) NOTE 3 M5 SCREWS TOP MOUNTING DETAIL 25.0 (0.98) (1.18) 30.0 SE-CS30-70 CURRENT SENSOR R R LR 53428 22.0 Ø 5.0 (0.20) RECESSED FOR 8-mm HEX NUT 1.0 (0.04) DEEP 5.5 110.0 5.5 (0.22) (4.33) (0.22) 56.0 (2.21) SIDE FRONT MOUNTING FOOT INSTALLATION TOOL 126.0 69. 8 (2.7 5) NOTES: 1. DIMENSIONS IN MILLIMETRES (INCHES). 2. PRESS MOUNTING FEET IN PLACE USING INSTALLATION TOOL PROVIDED (DETAIL ‘A’). 3. MOUNTING SCREWS: M4 OR 8-32. DETAIL ‘A’ FIGURE 17. SE-CS30-70 Ground-Fault Current Sensor. (4.96) US (0.87) (5.43) 138.0 MAX C 4. RoHS COMPLIANT. 5. EN 60044-1 COMPLIANT. Page 23 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor P1 Ground Fault Sensing and Relaying Equipment 4FX9 E340889 ® S1 68.0 (2.68) 34.0 (1.34) S2 68.0 (2.68) M4 OR 8-32 TAP 26.5 (1.04) 52.5 (2.07) 42.6 (1.68) 17.0 (0.67) MOUNTING DETAIL TOP (0.43) 110.0 MAX M5 SCREWS 25.0 (0.98) 26.5 (1.04) SE-CS30-26 CURRENT SENSOR R R LR 53428 US 4.0 (0.16) Ø 0 6. 2) .0 (1 7.0 2 RECESSED FOR 7-mm HEX NUT 3.0 (0.12) DEEP 58.0 (2.28) (0.87) 34.0 (1.34) 72.0 (2.83) C 5.0 (0.20) 5.0 (0.20) 52.5 (2.07) FRONT SIDE NOTES: 1. DIMENSIONS IN MILLIMETRES (INCHES). 2. PRESS MOUNTING FEET IN PLACE USING INSTALLATION TOOL PROVIDED (DETAIL ‘A’). MOUNTING FOOT INSTALLA TION TOOL 3. MOUNTING SCREWS: M4 OR 8-32. 4. RoHS COMPLIANT. 5. EN 60044-1 COMPLIANT. DETAIL ‘A’ 6. SE-CS30-26 SHOWN. FIGURE 18. EFCT-26 and SE-CS30-26 Ground-Fault Current Sensors. Page 24 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor 30.0 (1.18) RESISTOR FAULT 17.3 (0.68) 36.6 (1.44) 29.9 (1.17) NOTE 4 22.2 (0.87) DIA NOTES: LEGEND PLATES 1. TWO RED LED LIGHTS 24-120 VAC/DC, NOT POLARITY SENSITIVE. 2. YELLOW PUSH BUTTON 3 A @ 240 VAC - A600, 0.5 A @ 125 VDC - Q600. 30.0 MINIMUM (1.18) (1.57) 40.0 MINIMUM 43.5 36.6 (1.44) (1.71) PILOT LIGHTS 14.9 (0.59) 3. DIMENSIONS IN MILLIMETRES (INCHES). 4. ----- INDICATES CLEARANCE REQUIRED. 29.9 (1.17) PUSH BUTTON GROUND FAULT LEGEND PLATE (0.59) 22.5 (0.89) 15.0 X1 X2 43.5 (1.71) 25.0 (0.98) RESET 5. PANEL THICKNESS 1.0 TO 6.0 (0.04 TO 0.24). MOUNTING DETAIL 6. NEMA 4X. FIGURE 19. RK-332 Remote Indication and Reset. 3.4 ISOLATED GROUND CONNECTION An isolated ground bed can prevent a ground potential rise (GPR) from being transferred to remote equipment. If the G terminals on the sensing resistor and the SE-330 are connected to an isolated ground, the SE-330 will be exposed to the GPR. If the GPR is greater than the terminal-block rating, the SE-330 must be isolated from station ground and precautions must be taken with the power supply and the trip contacts. See Technical Note RG-1 “NGR Monitoring with Isolated Ground Beds” at www.littelfuse.com/protectionrelays. A configuration which allows an SE-330 to be connected to station ground is shown in Fig. 20. The SE-330 monitors the series combination of the NGR and the two ground beds. This configuration is acceptable provided the series resistance of the NGR and the ground beds is within the NGR calibration range and ground-bedresistance changes remain within the trip range. See Section 6.1. NEUTRAL ER-SERIES N SENSING RESISTOR STATION TRIP CIRCUIT 22 NGR 23 R STATION CONTROL SUPPLY 1 2 K1 L1 R L2/N G G 6 7 SE-330 3 STATION GROUND BUS STATION GROUND BED ISOLATED GROUND BED REMOTE GROUND FIGURE 20. Simplified Isolated-Ground Connection. SE-330 Neutral-Grounding-Resistor Monitor 3.5 PULSING CONNECTION Set switch S1 to K1 = PULSING and use an external switch as shown in Fig. 21 to use relay K1 to control a pulsing contactor. Relays K2 and K3 can be used for tripping; however, they operate in the non-fail-safe mode only. TO SENSING RESISTOR TERMINAL N NEUTRAL NOTE 1 NGR L 22 23 K1 16 SE-330 PULSE 17 ENABLE C N NOTE 2 NOTES: 1. ALTERNATE NGR CONFIGURATION. 2. SET SWITCH S1 TO K1 = PULSING. FIGURE 21. Simplified Pulsing Connection. 4. COMMUNICATIONS 4.1 LOCAL COMMUNICATIONS PORT The SE-330 has an RS-232 communications port which is designed for use with firmware-upgrade and system-monitoring software running on a PC. The RS-232 port is non-isolated and operates as a DCE device with the connector (socket contacts) pin-out listed in Table 3. This port allows direct connection to a PC using standard DB-9 connector cables. Cable length should not exceed 10 metres. PIN # 1 2 3 4 5 6 7 8 9 TABLE 3. RS-232 DB-9 TERMINALS SIGNAL NAME COMMENTS DCD RD TD DTR SG DSR RTS CTS RI 470 connected to +12 V Output to DTE from SE-330 Input from DTE to SE-330 Not connected Signal Ground 470 connected to +12 V Not connected 470 connected to +12 V Not connected Page 25 Rev. 9-A-112913 4.1.1 LOCAL DATA ACQUISITION The SE-330 outputs a data packet every second. Data output is in the standard UART data format of eight data bits and one stop bit. The baud rate is fixed at 38,400 bits per second. Use PC program SE-MON330 to display the following data: SE-330 settings and switch states. Neutral voltage and current. Resistance change. Trip status. Pending trips. Relay and LED status. NGR calibration value. - Expected 20-k value: RNGR to (RNGR-300) - Expected 100-k value: RNGR to (RNGR-4,000) Firmware revision level. The last ten trip records. Each record contains the trip cause and the pre-trip NGR current, voltage, and resistance values. Data can be logged to a PC file at user-defined time intervals for future analysis. 4.1.2 LOCAL COMMUNICATIONS COMMANDS As of firmware revision 10, the SE-330 supports event record commands through the local RS-232 communications port. Commands are input as standard ASCII characters. The latest revision of SE-MON330 supports the following commands: ‘d’ – Read event records. ‘c’ – Clear event records 4.1.3 FIRMWARE UPGRADE The local port can be used to upgrade the SE-330 firmware. Upgrade procedure: 1) Remove supply voltage. 2) Set switch S8 to UPGRADE. 3) Apply supply voltage. The DIAGNOSTIC LED will be on and all relays will be de-energized. 4) Run SE-FLASH and follow the instructions. 5) Remove supply voltage. 6) Set switch S8 to RUN. 7) Apply supply voltage. SE-MON330 and SE-FLASH are available at www.littelfuse.com/protectionrelays. 4.2 NETWORK COMMUNICATIONS The SE-330 interface for optional communications modules supports DeviceNet™, PROFIBUS®, and Ethernet: DeviceNet™: DeviceNet Slave. DeviceNet specification Vol 1:2.0, Vol 2:20. Page 26 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor PROFIBUS®: PROFIBUS-DP Slave according to IEC 61158. Ethernet: Modbus TCP Class 0, 1. Ethernet/IP Level 2 I/O Server CIP (ControlNet and DeviceNet) WebServer, on-board selection of IP address. Communications options allow the user to: Read SE-330 settings. Read neutral voltage and current. Read resistance change. Read trip status. Reset trips. Perform a remote trip. Access the last ten trip records. Each trip record contains the cause of trip and the pre-trip NGR current, voltage, and resistance values. Clear event records. Refer to the appropriate SE-330 communicationsinterface manual. 5. TROUBLESHOOTING PROBLEM POWER LED off. POWER LED flashes. Calibration-Error Trip DIAGNOSTIC LED flash code = L-S-L...* Remote Trip DIAGNOSTIC LED flash code = L-S-S-L…* EEPROM-Error Trip DIAGNOSTIC LED flash code = L-S-S-S-L…* A/D-Converter-Error Trip DIAGNOSTIC LED flash code = L-S-S-S-S-L…* Software-Interrupt Trip DIAGNOSTIC LED flash code = L-S-S-S-S-S-L…* Illegal-Opcode Trip DIAGNOSTIC LED flash code = L-S-S-S-S-S-S-L…* Watchdog Trip DIAGNOSTIC LED flash code = L-S-S-S-S-S-S-S-L…* Clock-Failure Trip DIAGNOSTIC LED flash code = L-S-S-S-S-S-S-S-S-L…* CPU Trip DIAGNOSTIC LED flash code = L-S-S-S-S-S-S-S-S-S-L…* DIAGNOSTIC LED = Solid Red Pressing RESET does not clear trips. UNIT HEALTHY relay K4 momentarily changes state. GROUND-FAULT and RESISTOR-FAULT LED's flash during reset. No analog-output current. *L = long pause, S = short flash. SOLUTION Check if supply voltage is present on terminals 1 and 2. If present, an overvoltage may have caused the power supply to shutdown. Cycle supply voltage. If POWER LED remains off, return unit for repair. A power-supply overload has occurred. Cycle supply voltage. If problem persists, consult Littelfuse Startco. The total resistance of the NGR and sensing-resistor circuit is outside the calibration range. Verify that switch S5 is set to match the resistance of the sensing resistor, check the resistance of the NGR, and verify the sensing-resistor circuit. See Section 9.2 for sensing-resistor tests. Repeat the calibration procedure after the open or shorted condition has been corrected. The SE-330 was tripped by a signal from network communications. Press RESET to clear the trip. An error was detected in the EEPROM. Press RESET to clear the trip. If the problem persists, consult Littelfuse Startco. An A/D-converter error was detected. Press RESET to clear the trip. If the problem persists, consult Littelfuse Startco. These four errors result in a processor reset. During reset, UNIT HEALTHY relay K4 will be de-energized. After a reset, UNIT HEALTHY relay K4 will be energized. Press RESET to clear the trip. If the problem persists, consult Littelfuse Startco. When supply voltage is cycled, the specific error code is lost but the CPU Trip Code will be displayed. This code is displayed if the supply is cycled after one of the previous four errors occurred. Press RESET to clear the trip. Switch S8 is in the UPGRADE position. If firmware upgrade is not required, set switch S8 to RUN and cycle supply. SE-330 processor failed to start. Cycle supply. Consult Littelfuse Startco if problem persists. Trip condition is still present. Locate and correct. The face-plate RESET button is disabled if remote-reset terminals 15 and 16 are connected. Replace shorted remote-reset switch or issue Reset command from the communications network. Occurs when processor is reset. Normal operation. The output at terminals 19 and 20 requires a voltage source. See Fig. 2 for analog-output connections. See Section 9.3 for the analog-output tests. SE-330 Neutral-Grounding-Resistor Monitor 6. TECHNICAL SPECIFICATIONS 6.1 SE-330 Supply Option 0 ................................. 30 VA, 120 to 240 Vac (+10, -45%) 50/60 Hz; 20 W, 110 to 250 Vdc (+10, -25%) Option 2 ................................. 20 W, 48 Vdc (+50, -25%) 35 VA, 48 Vac (+10, -45%) 50/60 Hz Power-Up Time ......................... 250 ms at 120 Vac AC Measurements ..................... Discrete Fourier Transform. 16 samples per cycle, 50 or 60 Hz Resistor-Fault Circuit: Neutral-To-Ground Voltage Trip Levels: ER-600VC or ER-5KV ...... 20; 60; 100; 130; 170; 200; 340; 800; 1,200; 1,700; 2,000 Vac ER-15KV to ER-35KV ...... 100; 300; 500; 650; 850; 1,000; 1,700; 4,000; 6,000; 8,500; 10,000 Vac Accuracy ............................. 5% of setting 3 dB Frequency Response .. S6 = 50 Hz ..................... 25-85 Hz S6 = 60 Hz ..................... 30-90 Hz NGR Calibration Range: ER-600VC or ER-5KV ...... 0 to 2 k ER-15KV to ER-35KV ...... 0 to 10 k Trip Resistance, VN = 0: ER-600VC or ER-5KV ...... 500- change ± 200 ER-15KV to ER-35KV ...... 2.5-k change ± 1 k Neutral-To-Ground DC-Voltage Rejection: ER-600VC or ER-5KV ...... 25 Vdc ER-15KV to ER-35KV ...... 125 Vdc Trip Time .................................. 12 ± 1 s Trip Hold-Off Level................. 5% of CT-Primary Rating Operating Mode ....................... Latching/Non-Latching Ground-Fault Circuit: Trip Level ................................. 2, 4, 6, 8, 10, 15, 20, 40, 60, 80, 100% of CT-Primary Rating Trip Time .................................. 0.1, 0.2, 0.3, 0.4, 0.5, 0.7, 1.0, 2.0, 3.0, 5.0, 10.0 s Trip-Level Accuracy ................ 1% of CT-Primary Rating Trip-Time Accuracy ................ 10% of Setting 3 dB Frequency Response ....... S6 = 50 Hz........................... 25-85 Hz S6 = 60 Hz........................... 30-90 Hz Maximum CT lead resistance: EFCT & SE-CS30 .............. 5 Other CT’s........................... Consult CT Curve. CT-Input Burden: 5-A Input ............................. < 0.01 Page 27 Rev. 9-A-112913 1-A Input ............................. < 0.05 EFCT Input ......................... < 10 Thermal Withstand: 1-A and 5-A Input: Continuous ...................... 2 x CT Rating 1-Second.......................... 20 x CT Rating EFCT Input: Continuous ...................... 10 x CT Rating 1-Second.......................... 25 x CT Rating Measurement Range ................ 25 x CT-Primary Rating Operating Mode ....................... Latching/Non-Latching Pulsing Circuit: Pulse Period.............................. 1.0 to 3.0 s, 0.2-s increments Duty Cycle ............................... 50% Time Accuracy......................... 10% of Setting Trip/Pulsing Relay K1 Contacts: Configuration ........................... N.O. (Form A) Operating Mode ....................... Fail-Safe or Non-Fail-Safe CSA/UL Contact Ratings ........ 8 A resistive 250 Vac, 5 A resistive 30 Vdc Supplemental Contact Ratings: Make/Carry 0.2 s ................ 30 A Break: dc ...................................... 75 W resistive, 35 W inductive (L/R = 0.04) ac ...................................... 2,000 VA resistive, 1,500 VA inductive (PF = 0.4) Subject to maximums of 8 A and 250 V (ac or dc). GF (K2) and RF (K3) Relay Contacts: Configuration ........................... N.O. and N.C. (Form C) Operating Mode ....................... Non-Fail-Safe CSA/UL Contact Ratings ........ 8 A resistive 250 Vac, 8 A resistive 30 Vdc Supplemental Contact Ratings: Make/Carry 0.2s ................. 20 A Break: dc ...................................... 50 W resistive, 25 W inductive (L/R = 0.04) ac ...................................... 2,000 VA resistive, 1,500 VA inductive (PF = 0.4) Subject to maximums of 8 A and 250 V (ac or dc). Unit Healthy Output K4 (Option 0): Configuration ........................... N.O. (Form A) Operating Mode ....................... Closed when Healthy Ratings...................................... 100 mA, 250 V (ac or dc) Closed Resistance .................... 30 to 50 Unit Healthy Output K4 (Option 1): Configuration ........................... N.C. (Form B) Operating Mode ....................... Open when Healthy Ratings...................................... 100 mA, 250 V (ac or dc) Closed Resistance .................... 25 to 50 Page 28 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor Auto-reset time ............................. 2.8 s maximum 4–20-mA Analog Output: Type .......................................... Self Powered and Loop Powered Range ........................................ 4 to 22 mA Loop Voltage ............................ 8 to 36 Vdc Load .......................................... 500 (maximum with 24-Vdc supply) Isolation .................................... 120 Vac Parameter .................................. NGR Current RS-232 Communications: Baud Rate ................................. 38.4 kbit/s Protocol..................................... Proprietary Terminal-Block Ratings ............... 10 A, 300 Vac, 12 AWG (2.5 mm2) PWB Conformal Coating ............. MIL-1-46058 qualified, UL QMJU2 recognized Mounting Configurations ............. Panel Mount and Surface Mount Shipping Weight ........................... 2.0 kg (4.4 lb) Environment: Operating Temperature ............ -40 to 60°C Storage Temperature ................ -55 to 80°C Humidity ................................... 85% Non-Condensing Surge Withstand ........................... ANSI/IEEE C37.90.11989 (Oscillatory and Fast Transient) EMC .............................................. EN 55011:1998 Certification .............................. CSA, Canada and USA R C LR 53428 US UL Listed Australia(1) 6.2 SENSING RESISTORS ER-600VC: Maximum Voltage ................ 600 Vac Maximum Current ................. 30 mA Resistance ............................. 20 k Thermal .................................... Continuous Shipping Weight ...................... 300 g (0.7 lb) ER-5KV: Maximum Voltage ................ 2,500 Vac Maximum Current ................. 125 mA Resistance ............................. 20 k Thermal .................................... Continuous Shipping Weight ...................... 5.0 kg (11 lb) ER-5WP: Maximum Voltage ................ 2,500 Vac Maximum Current ................. 125 mA Resistance ............................. 20 k Thermal .................................... Continuous Shipping Weight ...................... 5.0 kg (11 lb) ER-15KV: Maximum Voltage ................ 8,400 Vac Maximum Current ................. 84 mA Resistance ............................. 100 k Thermal .................................... 1 minute on, 120 minutes off Shipping Weight ...................... 5.0 kg (11 lb) ER-25KV: Maximum Voltage ................ 14,400 Vac Maximum Current ................. 144 mA Resistance ............................. 100 k Thermal .................................... 1 minute on, 120 minutes off Shipping Weight ...................... 20 kg (44 lb) ER-35KV: Maximum Voltage ................ 22,000 Vac Maximum Current ................. 220 mA Resistance ............................. 100 k Thermal .................................. 1 minute on, 120 minutes off Shipping Weight .................... 40 kg (88 lb) Certification .............................. CSA, Canada and USA R (1) CE, European Union C LR 53428 US UL Listed (1) See Ordering Information. CE, European Union Page 29 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor 6.3 CURRENT SENSORS Environment: Operating Temperature ............ -40 to 60°C (-40 to 140°F) Storage Temperature ................ -55 to 80°C (-67 to 176°F) EFCT-1: Current Ratio ......................... 5:0.05 A Insulation ............................... 600-V Class Window Diameter ................. 82 mm (3.2") Shipping Weight.................... 0.9 kg (2.0 lb) Certifications ......................... CSA, UL, CE Compliance ........................... RoHS, IEC 60044-1 Extended Operating Temperature ............................. -55 to 60°C (-67 to 140°F)(1) Supplemental Specifications: Trip Level Accuracy: ≤ 1 A ..................... 1% of CT-Primary Rating > 1 A ..................... 3% of CT-Primary Rating EFCT-26: Current Ratio ......................... 5:0.05 A Insulation ............................... 600-V Class Window Diameter ................. 26 mm (1.0") Shipping Weight .................... 0.45 kg (1.0 lb) Certifications ......................... CSA, UL, CE Compliance ........................... RoHS, IEC 60044-1 Extended Operating Temperature ............................. -55 to 60°C (-67 to 140°F)(1) Supplemental Specifications: Trip Level Accuracy: ≤ 1 A ..................... 1% of CT-Primary Rating > 1 A ..................... 3% of CT-Primary Rating SE-CS10-2.5: Current Ratio ......................... 1,000:5 A Insulation ............................... 600-V Class Window Diameter ................. 63 mm (2.5”) Shipping Weight.................... 0.7 kg (1.5 lb) Certifications ......................... CE Compliance ........................... IEC 60044-1 SE-CS30-26: Current Ratio ....................... 30:0.05 A Insulation ............................. 600-V Class Window Diameter ............... 26 mm (1.0”) Shipping Weight .................. 0.45 kg (1.0 lb) Certifications ....................... CSA, UL, CE Compliance ......................... RoHS, IEC 60044-1 SE-CS30-70: Current Ratio ....................... 30:0.05 A Insulation ............................. 600-V Class Window Diameter ............... 70 mm (2.7”) Shipping Weight.................. 1.2 kg (2.5 lb) Certifications ........................CSA, UL, CE Compliance ..........................RoHS, IEC 60044-1 CT200: Current Ratio ........................200:5 A Insulation .............................600-V Class Window Diameter ................56 mm (2.2”) Shipping Weight ..................1 kg (2.2 lb) Certifications ........................CSA, UL Compliance ..........................RoHS NOTES: (1) Electrical specifications have been verified at a Littelfuse lab. 7. ORDERING INFORMATION SE-330- - K4 Contact: 0 N.O. UNIT HEALTHY Contact 1 N.C. UNIT HEALTHY Contact Options: 0 No Options 1 CE & C-Tick Compliance Network Communications: 0 None 1 DeviceNet™ 2 PROFIBUS® 3 Ethernet Supply: 0 Universal ac/dc Supply 2 48 Vdc NOTE: Please refer to the SE-330 Product Change Notice (PCN) document for updated ordering information and new revision details, available at www.littelfuse.com/se-330. NOTE: Each SE-330 includes an SE-330-SMA Surface Mount Adapter. Sensing Resistors: ER-600VC.............................. For system voltages up to 1 kVac ER-5KV ................................. For system voltages up to 5 kVac ER-5WP ................................. For system voltages up to 5 kVac, weather protected ER-15KV ............................... For system voltages up to 15 kVac ER-25KV ............................... For system voltages up to 25 kVac ER-35KV ............................... For system voltages up to 35 kVac SE-330 Neutral-Grounding-Resistor Monitor Current Transformers: EFCT-1 ................................... Ground-Fault CT, 5-Aprimary rating, 82-mm (3.2") window, 6m (19.5’) of 22 AWG shielded cable included EFCT-26 ................................. Ground-Fault CT, 5-A-primary rating, 26-mm (1.0”) window, 6m (19.5’) of 22 AWG shielded cable included SE-CS30-26............................ Ground-Fault CT, 30-A-primary rating, 26-mm (1.0”) window SE-CS30-70............................ Ground-Fault CT, 30-A-primary rating, 70-mm (2.7”) window Accessories: RK-332 ................................... Remote Indication and Reset, Includes two 120-V pilot lights, a reset push button, and legend plates SE-IP65CVR-G...................... Hinged transparent cover, IP65 SE-MRE-600 .......................... Moisture-resistant enclosure for ER-600VC Software: (1) SE-FLASH ............................. Firmware Upgrade Program SE-MON330 .......................... SE-330 Data-Display Program for PC NGR Monitor Set-Point Assistant ................. Setting Guide (1) Available at www.littelfuse.com/relayscontrols. 8. WARRANTY The SE-330 Neutral-Grounding-Resistor Monitor is warranted to be free from defects in material and workmanship for a period of five years from the date of purchase. Littelfuse Startco will (at Littelfuse Startco’s option) repair, replace, or refund the original purchase price of an SE-330 that is determined by Littelfuse Startco to be defective if it is returned to the factory, freight prepaid, within the warranty period. This warranty does not apply to repairs required as a result of misuse, negligence, an accident, improper installation, tampering, or insufficient care. Littelfuse Startco does not warrant products repaired or modified by non-Littelfuse Startco personnel. Littelfuse Startco is not liable for contingent or consequential damages; for expenses sustained as a result of incorrect application, incorrect adjustment, or a malfunction; or for expenses resulting from the use of, or inability to use, the product. Page 30 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor 9. TEST PROCEDURES 9.1 RESISTOR-FAULT TESTS Perform tests with system de-energized and supply voltage applied to the SE-330. 9.1.1 CALIBRATION AND OPEN TEST Test Equipment: 20-k and 100-k, 1/4-watt, 1% calibration resistors (calibration resistors are supplied with SE-330). Procedure: Remove connections to terminals 6 and 7. Connect the 20-k resistor to terminals 6 and 7. Set switch S5 to the 20-k position. Perform calibration as per Section 2.2. The CALIBRATED LED should be on. Press RESET. Remove the 20-k resistor and wait for 12 seconds. PASS: The SE-330 should trip on resistor fault. Connect the 100-k resistor to terminals 6 and 7. Set switch S5 to the 100-k position. Perform calibration as per Section 2.2. The CALIBRATED LED should be on. Press RESET. Remove the 100-k resistor and wait for 12 seconds. PASS: The SE-330 should trip on resistor fault. NOTE: Resistor-fault-trip reset can take up to one second. 9.1.2 VOLTAGE TEST Test Equipment: 0 to 120 Vac voltage source and multimeter. NOTE: Use an isolation transformer if the test-voltage source does not provide dc continuity for the SE-330 resistancemeasuring circuit. NOTE: Applying the test voltage to the R and G terminals will damage the SE-330 and the ER sensing resistor. The VN TRIP LEVEL is the trip voltage at terminal N, not terminal R. Procedure: Check the ER sensing resistor connection to the SE-330. Disconnect the wire from sensing-resistor terminal N. A resistor-fault trip will occur. Set the voltage source to 0 V. Connect the voltage source between sensing resistor N and G terminals. Set the VN TRIP LEVEL (VAC) to 20. Press RESET. The RESISTOR FAULT TRIP LED should be off. Increase the test voltage to 25 Vac for 20-k sensors or 120 Vac for 100-k sensors and wait 12 seconds PASS: The SE-330 should trip on RESISTOR FAULT. For units with firmware Revision 7 or higher, a time- Page 31 Rev. 9-A-112913 delayed ground-fault trip follows the resistor-fault trip if neutral voltage persists after the resistor fault 9.2 SENSING-RESISTOR TEST Test Equipment: Multimeter. Procedure: Disconnect the sensing resistor. Measure the resistance between sensing-resistor terminals R and N. PASS: Resistance should be between 19.6 and 20.4 k for 20-k sensing resistors. Resistance should be between 98 and 102 k for 100-k sensing resistors. Measure the resistance between sensing-resistor terminals R and G in both directions. PASS: Resistance should be greater than 10 M in both directions. 9.3 ANALOG-OUTPUT TEST Test Equipment: Multimeter with a mAdc scale. Procedure: Connect the 4–20-mA output as a self-powered output as shown in Fig. 3. Measure the current from terminal 20 to terminal 21. PASS: With no CT current, the analog output should be 4 mA. Output is linear to 20 mA. Output is 20 mA when CTprimary current is equal to the CT-primary rating. SE-330 Neutral-Grounding-Resistor Monitor 9.4 GROUND-FAULT PERFORMANCE TEST To meet the requirements of the National Electrical Code (NEC), as applicable, the overall ground-fault protection system requires a performance test when first installed. A written record of the performance test is to be retained by those in charge of the electrical installation in order to make it available to the authority having jurisdiction. A test-record form is provided for recording the date and the final results of the performance tests. The following ground-fault system tests are to be conducted by qualified personnel: a) Evaluate the interconnected system in accordance with the overall equipment manufacturer’s detailed instructions. b) Verify proper location of the ground-fault current transformer. Ensure the cables pass through the ground-fault-current-transformer window. This check can be done visually with knowledge of the circuit. The connection of the current-transformer secondary to the SE-330 is not polarity sensitive. c) Verify that the system is correctly grounded and that alternate ground paths do not exist that bypass the current transformer. High-voltage testers and resistance bridges can be used to determine the existence of alternate ground paths. d) Verify proper reaction of the circuit-interrupting device in response to a simulated or controlled groundfault current. To simulate ground-fault current, use CT-primary current injection. Fig. 22a shows a test circuit using an SE-400 Ground-Fault-Relay Test Unit. The SE-400 has a programmable output of 0.5 to 9.9 A for a duration of 0.1 to 9.9 seconds. Set the test current to 120% of GF TRIP LEVEL. Fig. 22b shows a test circuit using an SE-100T Ground-Fault-Relay Tester. The SE-100T provides a test current of 0.65 or 2.75 A for testing 0.5- and 2.0-A trip levels. Inject the test current through the currenttransformer window for at least 2.5 seconds. Verify that the circuit under test has reacted properly. Correct any problems and re-test until the proper reaction is verified. e) Record the date and the results of the test on the attached test-record form. NOTE: Do not inject test current directly into CT-input terminals 8, 9, 10, and 11. NOTE: For accurate trip-time measurement, the fault current should not be re-applied for the time defined by the GF TRIP TIME setting to allow the trip accumulator to initialize. Page 32 Rev. 9-A-112913 SE-330 Neutral-Grounding-Resistor Monitor a) USING SE-400 DATE Page 33 Rev. 9-A-112913 TABLE 4. GROUND-FAULT-TEST RECORD TEST RESULTS NEUTRAL TO SE-330 TO SENSING RESISTOR TERMINAL N NGR 11 3 L 5 N 8 9 12 L1 L2 1 REMOTE INPUT OP2 OP1 SE-400 RMT1 RMT2 b) USING SE-100T NEUTRAL TO SE-330 TO SENSING RESISTOR TERMINAL N NGR C LO L L1 HI N L2 REMOTE TEST 0.65 A 2.75 A SE-100T RMT FIGURE 22. Ground-Fault-Test Circuits. Retain this record for the authority having jurisdiction. SE-330 Neutral-Grounding-Resistor Monitor This page intentionally left blank. Page 34 Rev. 9-A-112913