3714 Kinnear Place Saskatoon, SK Canada S7P 0A6 Ph: (306) 373-5505 Fx: (306) 374-2245 www.littelfuse.com/relayscontrols SE-330HV MANUAL NEUTRAL-GROUNDING-RESISTOR MONITOR REVISION 4-A-112913 LITTELFUSE STARTCO NEUTRAL-GROUNDING-RESISTOR SE-330HV MONITOR GROUND FAULT RESISTOR FAULT DIAGNOSTIC TRIP TRIP CALIBRATED RELAY K1 8 6 10 15 20 40 60 POWER 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 10.0 850 650 500 1000 1700 4000 6000 300 8500 100 10000 VN TRIP LEVEL (S5 (S5 200 K Ω VN x 2) 100 K Ω VN x 1) CAL GF TRIP TIME (s) RESET Copyright 2012 Littelfuse Startco. All rights reserved. Publication: SE-330HV-M Document: S95-C330-0H000 Printed in Canada. Page i Rev. 4-A-112913 SE-330HV Neutral-Grounding-Resistor Monitor PAGE TABLE OF CONTENTS PAGE 1. General ................................................................... 1 1.1 Modern Resistance-Grounded Systems ................... 1 1.2 SE-330HV 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 Configuration Settings .................................. 3 2.1.4.1 Spare (S1) ........................................ 3 2.1.4.2 Trip-Relay Mode (S2) ...................... 3 2.1.4.3 Ground-Fault-Trip Latch (S3).......... 3 2.1.4.4 Resistor-Fault-Trip Latch (S4)......... 3 2.1.4.5 Sensing-Resistor Selection (S5)....... 3 2.1.4.6 Frequency (S6)................................. 3 2.1.4.7 Spare (S7) ........................................ 3 2.1.4.8 Upgrade Enable (S8)........................ 3 2.2 Calibration ............................................................... 3 2.3 Trip Indication and Reset......................................... 4 2.4 Remote Operation .................................................... 4 2.5 Relay K1 LED ......................................................... 4 2.6 Unit Healthy Output ................................................ 4 2.7 Diagnostic LED ....................................................... 4 2.8 Analog Output ......................................................... 5 3. 3.1 3.2 3.3 3.4 Installation .............................................................. 5 SE-330HV ............................................................... 5 Sensing Resistor....................................................... 5 Ground-Fault CT ................................................... 17 Isolated Ground Connection .................................. 21 4. Communications .................................................. 22 4.1 Local Communication Port .................................... 22 4.1.1 Local Data Acquisition ............................... 22 4.1.2 Local Communications Commands ............ 22 4.1.3 Firmware Upgrade ...................................... 22 4.2 Network Communications ..................................... 22 5. Troubleshooting ................................................... 23 6. 6.1 6.2 6.3 Technical Specifications ...................................... 24 SE-330HV ............................................................. 24 Sensing Resistors ................................................... 25 Current Sensors ...................................................... 26 7. Ordering Information ......................................... 26 8. Warranty .............................................................. 27 9. Test Procedures ....................................................28 9.1 Resistor-Fault Tests ................................................28 9.1.1 Calibration and Open Test ..........................28 9.1.2 Voltage Test ...............................................28 9.2 Sensing-Resistor Test .............................................28 9.3 Analog-Output Test ................................................28 9.4 Ground-Fault Performance Test .............................28 LIST OF FIGURES FIGURE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 PAGE Configuration Switches ............................................3 Analog-Output Connections .....................................5 SE-330HV Connection Diagram ..............................6 SE-330HV Outline and Panel-Mounting Details......7 SE-330HV Outline and Surface-Mounting Details ..8 SE-IP65CVR-G Weatherproof Cover Outline .........9 SE-IP65CVR-G Weatherproof Cover Installation ..............................................................10 ER-15KV Sensing Resistor ....................................11 ER-25KV Sensing Resistor ....................................12 ER-35KV Sensing Resistor ....................................13 ER-72KV Sensing Resistor Outline .......................14 ER-72KV Sensing Resistor Mounting Details .......15 ER-1000HV Sensing Resistor ................................16 ER-1000HV Simplified Connection Diagram ........17 EFCT-1 Ground-Fault Current Sensor ...................18 SE-CS30-70 Ground-Fault Current Sensor ............19 EFCT-26 and SE-CS30-26 GroundFault Current Sensors .............................................20 RK-332 Remote Indication and Reset ....................21 Simplified Isolated-Ground Connection .................21 Ground-Fault-Test Circuit ......................................29 LIST OF TABLES TABLE 1 2 3 4 PAGE Typical Values for Tripping Systems .......................2 Ground-Fault Trip Levels for Selected CT’s ............2 RS-232 DB-9 Terminals .........................................22 Ground-Fault-Test Record......................................29 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-330HV 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. 4-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-330HV NGR MONITORING The SE-330HV is a microprocessor-based neutralgrounding-resistor monitor that detects NGR failures and ground faults in resistance-grounded systems. The SE-330HV measures NGR resistance, NGR current, and transformer or generator neutral-to-ground voltage. The components required to monitor an NGR are an SE-330HV, a 100- or 200-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-330HV NGR monitoring. These elements include single-phase grounding transformers, grounded-wye-primary PT’s, and grounded-wye-primary power transformers. The SE-330HV 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-330HV 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-330HV 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-330HV 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 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-330HV has four output relays. Relay K1 is the trip relay. Relays K2 and K3 provide ground-fault and resistor-fault indication. K4 is a solid-state relay that provides UNIT HEALTHY indication. Relay K1 will operate on either a resistor fault or a ground fault, and it can be set to operate in the fail-safe or non-fail-safe mode for undervoltage or shunt-trip applications. 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. Page 2 Rev. 4-A-112913 SE-330HV Neutral-Grounding-Resistor Monitor 2.1.3 VN TRIP LEVEL The SE-330HV 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 100 to 10,000 V with switch S5 in the 100-k (Vx1) position, and the range is 200 to 20,000 V with switch S5 in the 200-k (Vx2) position. See Fig. 1 and Section 2.1.4.5. 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-330HV 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 15-, 25- and 100-A tripping systems are shown in Table 1. Refer to the NGR Monitor SetPoint Assistant at www.littelfuse.com/protectionrelays for other systems. 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. 2.1.2 GF TRIP LEVEL The SE-330HV 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 15-, 25-, and 100-A tripping systems are shown in Table 1. Ground-fault trip levels for selected CT’s are shown in Table 2. Refer to the NGR Monitor Set-Point Assistant at www.littelfuse.com/protectionrelays for other systems. NOTE: A resistor-fault trip is held off if the groundfault current is above 5% of the CT rating. TABLE 1. TYPICAL VALUES FOR TRIPPING SYSTEMS System Voltage (Volts) 7,200 14,400 7,200 14,400 25,000 35,000 72,000 Neutral-Grounding Resistor Current Resistance (Amperes) (Ohms) 15 277 15 554 25 166 25 332 25 577 25 808 100 420 Model ER-15KV ER-15KV ER-15KV ER-15KV ER-25KV ER-35KV ER-72KV Sensing Resistor Resistance (Switch S5 Setting) 100 k 100 k 100 k 100 k 100 k 100 k 200 k Ground-Fault Trip Level VN Trip Level (Amperes) 3.0 3.0 5.0 5.0 5.0 5.0 20.0 (Volts) 850 1,700 850 1,700 4,000 6,000 6,000 x 2 = 12,000 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 50 100:1 100:5 (Amperes) * * * 8 10 15 20 40 60 80 100 200:1 200:5 (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 SE-330HV Neutral-Grounding-Resistor Monitor 2.1.4 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. Page 3 Rev. 4-A-112913 2.1.4.6 FREQUENCY (S6) Set switch S6 to 50 or 60 Hz to tune the digital filter to the line frequency of the monitored system. 2.1.4.7 SPARE (S7) CALIBRATION PUSH BUTTON CAL SPARE FAIL-SAFE S1 S2 NON-FAIL-SAFE LATCHING GF TRIP S3 NON-LATCHING GF TRIP LATCHING RF TRIP S4 NON-LATCHING RF TRIP 200 kΩ 50 Hz SPARE RUN S5 100 kΩ 2.1.4.8 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 voltage is cycled. Protection is disabled after supply voltage is cycled with S8 in the UPGRADE position. See Section 4.1.3. S6 60 Hz S7 S8 UPGRADE NOTE: DEFAULT SETTINGS SHOWN. FIGURE 1. Configuration Switches. 2.1.4.1 SPARE (S1) 2.1.4.2 TRIP-RELAY MODE AND TRIP MEMORY (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-330HV 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 fail-safe mode, SE-330HV trips are not reset when supply voltage is cycled. NOTE: Switch S2 does not affect the operating modes of relays K2, K3, and K4. 2.1.4.3 GROUND-FAULT-TRIP LATCH (S3) Set switch S3 to select latching or non-latching groundfault-circuit operation. See Section 2.3. 2.1.4.4 RESISTOR-FAULT-TRIP LATCH (S4) Set switch S4 to select latching or non-latching resistorfault-circuit operation. See Section 2.3 2.1.4.5 SENSING-RESISTOR SELECTION (S5) Set switch S5 to the resistance of the sensing resistor. For the ER-15KV, ER-25KV, and ER-35KV, select 100 k. For the ER-72KV select 200 k. Switch S5 sets the resistor-fault trip value and the VN TRIP LEVEL range. See Section 2.1.3. 2.2 CALIBRATION The SE-330HV measures the resistance change of the NGR relative to the NGR-resistance value determined at the time of calibration. Calibrate the SE-330HV on new installations, if the NGR is changed, or if the sensing resistor is changed. NOTE: If the SE-330HV 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-330HV 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 2.7. 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. SE-330HV Neutral-Grounding-Resistor Monitor Page 4 Rev. 4-A-112913 2.3 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-330HV remains tripped until reset. See Sections 2.1.4.3 and 2.1.4.4. 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 2.7. When supply voltage is applied with switch S2 set to FAIL-SAFE, the SE-330HV returns to its state prior to loss of supply voltage. When supply voltage is applied with switch S2 set to NON-FAIL-SAFE, SE-330HV 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 can take up to 3 s after SE-330HV power up. 2.7 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. 2.4 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. 18. Connect them as shown in Fig. 3. RK-332 components are not polarity sensitive. Network-enabled SE-330HV’s can be remotely tripped and reset by the network master. The red DIAGNOSTIC LED indicates a network-initiated trip. See Section 2.7. Refer to the appropriate SE-330 communications manual. Clock-Failure Trip (8 short): CPU reset was caused by an internal clock failure. 2.5 RELAY K1 LED The yellow RELAY K1 LED follows the state of relay K1 and is on when K1 is energized (contact closed). 2.6 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 output changes state momentarily during a processor reset. NOTE: K4-contact rating is 100 mA maximum. 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-330HV 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. 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-330HV Neutral-Grounding-Resistor Monitor 2.8 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. 3. INSTALLATION 3.1 SE-330HV Outline and panel-cutout dimensions for the SE-330HV are shown in Fig. 4. To panel mount the SE-330HV, 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-330HV are made with plugin, 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-330HV 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-330HV. 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. Page 5 Rev. 4-A-112913 NOTE: When the terminal-4-to-5 connection is removed, protective circuits inside the SE-330HV are disconnected to allow dielectric strength testing of a control panel without having to disconnect wiring to the SE-330HV. Ensure that the terminal-4-to-5 connection is replaced after testing. 3.2 SENSING RESISTOR Outline and mounting details for ER-15KV, ER-25KV, ER-35KV and ER-72KV sensing resistors are shown in Figs. 8, 9, 10, 11 and 12. 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. 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. 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. Outline and mounting details for the ER-1000HV Sensing Resistor are shown in Fig. 13. This sensing resistor can be used to monitor a low-voltage very-high-resistance NGR. See the simplified diagram in Fig. 14. 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-330HV terminal R, including interposing terminal blocks, must remain dry. NOTE: The neutral-to-sensing-resistor-terminal-N 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. Page 6 Rev. 4-A-112913 SE-330HV Neutral-Grounding-Resistor Monitor TRANSFORMER OR GENERATOR NOTE 1 NOTE 12 XXX:1 OR NOTE 2 NOTES 12 & 13 XXX:5 EFCT-X OR SE-CS30-X NOTE 3 N 8 S 9 1 11 10 5 8 C S 9 ER-SERIES SENSING RESISTOR 10 11 5 1 NOTE 4 R G 1 NOTE 7 L2/N L1 K1 22 6 K3 28 K4 REMOTE RESET 16 17 NC UNIT HEALTHY NOTE 8 +24V 18 + 19 - 20 ANALOG OUTPUT RESET 0V DCD DSR 5 RESISTOR FAULT 21 NOTE 9 SELF POWERED 4-20 mA OUTPUT NC 3 4 GROUND FAULT 13 12 15 C 27 RF NOTE 15 NOTE 14 & 15 24 25 14 NOTE 6 N/- SUPPLY 2 GF 29 NOTE 5 7 23 K2 26 SPG G R ALTERNATE CT CONNECTIONS L/+ SUPPLY NGR C 5A 1A EFCT SE-330HV NEUTRAL CTS SPGA 1 6 8 5 RxD TxD OPTIONAL NETWORK COM NOTE 11 2 3 RS232 COM NOTE 10 NOTES: 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. ALTERNATE CT LOCATION. NGR MUST ONLY BE GROUNDED AT ONE POINT AS SHOWN. 6. SEE SECTION 3.4 FOR ISOLATED-EARTH CONNECTION. 7. RELAY CONTACTS SHOWN WITH SE-330HV DE-ENERGIZED. 8. OPTIONAL N.C. AVAILABLE. 9. LOOP-POWERED CONNECTION USES TERMINALS 19 AND 20 ONLY. 10. RS-232 PIN 4 (DTR), PIN 7 (RTS) AND PIN 9 (RI) NOT CONNECTED. 11. REFER TO APPROPRIATE SE-330 COMMUNICATIONS INTERFACE MANUAL. 12. TWO-CONDUCTOR TWISTED CABLE REQUIRED. SHIELDED OR ARMOURED RECOMMENDED. 13. CT CONNECTION IS NOT POLARITY SENSITIVE. 14. CONNECT CONTACTS K1, K2, K3, AND K4 AS REQUIRED FOR PROTECTION, INDICATION, AND CONTROL. SE-330HV FIGURE 3. SE-330HV Connection Diagram. 15. EXTERNAL LIGHTS AND SWITCHES NOT INCLUDED WITH SE-330HV. Page 7 Rev. 4-A-112913 SE-330HV Neutral-Grounding-Resistor Monitor 132.0 (5.20) 16.0 (0.63) 98.3 PANEL THICKNESS 1.6 (0.06) TO 4.8 (0.19) (3.87) LITTELFUSE STARTCO NEUTRAL-GROUNDING-RESISTOR SE-330HV MONITOR GROUND FAULT RESISTOR FAULT DIAGNOSTIC TRIP 1 2 3 4 5 CALIBRATED 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 POWER 1000 1700 4000 6000 300 8500 100 10000 VN TRIP LEVEL (S5 (S5 2.0 3.0 5.0 10.0 GF TRIP TIME (s) 850 650 500 200 K Ω VN x 2) 100 K Ω VN x 1) CAL 185.4 15 212.6 (8.37) 10 (7.30) RELAY K1 8 6 12 13 NC - 14 15 RESET 16 17 + 24V - 18 + - 19 ANALOG OUTPUT - - 20 0V - 2 1 UNIT HEALTHY K4 TRIP - 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 L O CK S 1 6 - R 7 - G 2 3 4 5 6 SENSING RESISTOR K1 22 23 7 8 8 9 10 11- RESET SIDE VIEW FRONT VIEW NOTE 2 8.2 (0.32) S E 1 F 5 5 A1 C T C A GROUND FAULT K2 RESISTOR FAULT K3 24 25 26 27 28 29 REAR VIEW 92.7 (3.65) 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-330HV Outline and Panel-Mounting Details. 1. DIMENSIONS IN MILLIMETRES (INCHES). 2. SE-330HV SHOWN WITHOUT SWITCH ACCESS COVER. Page 8 Rev. 4-A-112913 8.0 (0.31) 6.4 RETAINER SCREW RETAINER 114.3 (4.50) 98.3 (3.87) (0.25) SE-330HV Neutral-Grounding-Resistor Monitor 138.0 (5.43) LITTELFUSE STARTCO NEUTRAL-GROUNDING-RESISTOR SE-330HV MONITOR GROUND FAULT RESISTOR FAULT DIAGNOSTIC TRIP L1 - 1 L2/N - 2 - 3 SPG - 4 SPGA - 5 RELAY K1 10 15 20 40 60 4 80 2 100 GF TRIP LEVEL (% CT RATING) 0.7 0.5 1.0 SENSING RESISTOR 0.4 0.3 0.2 0.1 R - 6 G - 7 2.0 3.0 5.0 10.0 POWER S - 8 E 1 - 9 F C 1 T A 5 5 -1 0 A C -1 1 (S5 (S5 FRONT VIEW SE-330-SMA 25.4 (1.00) 200 K Ω VN x 2) 100 K Ω VN x 1) 1 2 6 7 3 4 5 6 7 8 8 9 10 11 RESET FRONT VIEW 63.5 (2.50) 5.0 RESISTOR FAULT K3 1000 1700 4000 6000 CAL GF TRIP TIME (s) GROUND FAULT K2 850 650 500 300 8500 100 10000 VN TRIP LEVEL (0.20) 24 25 26 27 28 29 K1 1 2 3 4 5 CALIBRATED 8 6 22 23 TRIP 212.6 (8.37) 225.4 (8.87) 12 NIT K4 U HEALTHY 13 14 - NC 15 RESET 16 PULSE ENABLE 17 18 - + 24V 19- + ANALOG OUTPUT 20 - 2 1 - 0V SIDE VIEW NOTES: 1. DIMENSIONS IN MIILLIMETRES (INCHES). (NOTE 2) 2. MOUNTING SCREWS: M4 OR 8-32 PANHEAD. MONITOR INSTALLATION 215.9 (8.50) 1. LOOSEN RETAINER SCREWS, MOVE RETAINERS OUT WARD, 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. MONITOR 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-330HV Outline and Surface-Mounting Details. Page 9 Rev. 4-A-112913 TO PREVENT UNAUTHORIZED ENTRY: (1.34) 34.0 SE-330HV 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 10 Rev. 4-A-112913 SE-330HV Neutral-Grounding-Resistor Monitor INSTALL O-RING INTO GROOVE IN THE REAR OF WEATHERPROOF WINDOW INSERT THE SE-330HV THROUGH OPENING OF THE WEATHERPROOF WINDOW, UNTIL IT IS SECURELY NESTED TO THE BACK OF THE DARK GREY PVC PANEL. FRONT-PANEL DETAILS NOT SHOWN. INSTALL O-RING INTO THE GROOVE IN THE REAR OF WEATHERPROOF WINDOW ASSEMBLY. INSERT ASSEMBLY INTO PANEL AND FASTEN WITH THE HARDWARE PROVIDED WITH THE SE-330HV. FIGURE 7. SE-IP65CVR-G Weatherproof Cover Installation. Page 11 Rev. 4-A-112913 SE-330HV Neutral-Grounding-Resistor Monitor 422.0 RATINGS: 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 CAUTION HIGH VOLTAGE 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 G MAXIMUM VOLTAGE . . 8,400 Vac MAXIMUM CURRENT . 84 mA RESISTANCE . . . . . . . . 100 kΩ THERMAL 8,400 Vac . . . . . . . . . . 1 MINUTE ON, 120 MINUTES OFF . . . . . . . . . . CONTINUOUS 1,900 Vac 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 8. ER-15KV Sensing Resistor. Page 12 Rev. 4-A-112913 SE-330HV 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 9. ER-25KV Sensing Resistor. Page 13 Rev. 4-A-112913 SE-330HV 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 10. ER-35KV Sensing Resistor. Page 14 Rev. 4-A-112913 SE-330HV Neutral-Grounding-Resistor Monitor 1044.9 (41.14) RATINGS: E R -7 2 KV CA UTI O N HI GH VOLTA GE TERMINAL N 0.25-20 BINDING HEAD (7.42) 188.6 N V O L T AG E AT T E R M IN AL N R I S E S T O L I N E - T O -N E UT R AL V O L T A G E WH E N A G R O U N D F A UL T O C CU R S 200 K 4 4 , 4 00 V A C M A X 1 M I N UT E M A X SENSING RESISTOR 1181.1 (46.50) MAXIMUM VOLTAGE . 44,000 Vac MAXIMUM CURRENT. 220 mA RESISTANCE . . . . . . . 200 kΩ THERMAL 44,000 Vac. . . . . . . . . 1 MINUTE ON, 120 MINUTES OFF 6,000 Vac . . . . . . . . . CONTINUOUS TORQUE TERMINAL N . . . . . . . 9.0 N-m (80 in-lb) 863.6 (34.00) 457.0 (17.99) 908.0 (35.75) TOP FRONT 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. FIGURE 11. ER-72KV Sensing Resistor Outline. RIGHT SIDE Page 15 Rev. 4-A-112913 SE-330HV Neutral-Grounding-Resistor Monitor 247.7 514.4 247.7 (9.75) (20.25) (9.75) (5.50) ER-72KV ORIENTED WITH TERMINAL N IN THIS LOCATION 140.0 247.7 432.0 (17.00) MINIMUM DISTANCE TO ADJACENT OBJECTS (9.75) 2286.0 (90.00) 432.0 (17.00) 247.7 432.0 (17.00) (9.75) 432.0 (17.00) 650.7 73.0 (2.88) (25.63) 365.0 (14.38) 1146.0 (45.13) 2133.6 (84.00) 1009.7 355.5 (39.75) (14.00) 775.0 (30.50) 768.4 (30.25) MINIMUM VERTICAL CLEARANCE FROM BASE: 1800.0 (70.87) NOTES: 1. DIMENSIONS IN MILLIMETRES (INCHES). 2. MOUNTING SCREWS: M6 OR 0.25-20. FIGURE 12. ER-72KV Sensing Resistor Mounting Details. Page 16 Rev. 4-A-112913 SE-330HV Neutral-Grounding-Resistor Monitor RATINGS: MAXIMUM VOLTAGE . 600 Vac MAXIMUM CURRENT. 3 mA RESISTANCE . . . . . . . 200 kΩ THERMAL . . . . . . . . . . CONTINUOUS 41.5 40.0 (1.63) (1.57) 10.5 19.0 10.5 (0.41) (0.75) (0.41) 8.0 22.2 (0.87) (0.31) 40.0 (1.57) NOTE 3 N 89.0 (3.50) 8.0 (0.31) 105.0 (4.13) 105.0 G (4.13) R ER-1000HV SENSI NG RES I STOR 20 0 K Ω 6 0 0 VA C M A X 4.5 (0.18) DIA C’BORE 10.0 (0.39) DIA 3.2 (0.13) DEEP FRONT SIDE NOTES: 1. DIMENSIONS IN MILLIMETRES (INCHES). 2. TERMINAL-BLOCK SCREWS: 6-32 x 0.25. 3. MOUNTING SCREWS: M4 OR 8-32. 4. 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. FIGURE 13. ER-1000HV Sensing Resistor MOUNTING DETAIL SE-330HV Neutral-Grounding-Resistor Monitor Page 17 Rev. 4-A-112913 NEUTRAL NGR NOTE 1 8 9 S 1 ER-1000HV SENSING RESISTOR 10 11 5 C 5A 1A EFCT R R 3 4 SPG 5 SPGA N G G 6 7 NOTES: L1 SE-330HV L2/N 1 2 L/+ SUPPLY N/- SUPPLY 1. GF TRIP SETTING IS PERCENT OF 50 mA WHEN NO CT IS USED. 2. FOR GF SETTING > 50 mA USE EFCT-x. MULTIPLE PRIMARY WRAPS MIGHT BE REQUIRED. FIGURE 14. ER-1000HV Simplified Connection Diagram. 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 Sections 2.1.2 and 2.8. Outline and mounting details for the EFCT- and SE-CS30-series current sensors are shown in Figs. 15, 16, and 17. Ground-fault-CT connections and the preferred ground-fault-CT location are shown in Fig. 3. If a ground fault in the NGR is unlikely, a minimal loss of protection will result if the ground-fault CT monitors the NGR connection to ground rather than its connection to neutral. A minimal loss of protection will also result if the sensing-resistor-to-neutral connection does not pass through the CT window. This alternate CT location is shown in Fig. 3. The accuracy of a typical current transformer 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 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. Bushing type CT’s are required for applications using bare conductors on the NGR’s neutral side. Page 18 Rev. 4-A-112913 SE-330HV 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 15. EFCT-1 Ground-Fault Current Sensor. 5.5 (0.22) 56.0 (2.21) SIDE Page 19 Rev. 4-A-112913 SE-330HV 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 16. 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 20 Rev. 4-A-112913 SE-330HV 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 . 26 RECESSED FOR 7-mm HEX NUT 3.0 (0.12) DEEP 2) 7.0 .0 (1 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 17. EFCT-26 and SE-CS30-26 Ground-Fault Current Sensors. Page 21 Rev. 4-A-112913 SE-330HV 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. 30.0 MINIMUM (1.18) 2. YELLOW PUSH BUTTON 3 A @ 240 VAC - A600, 0.5 A @ 125 VDC - Q600. (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 18. 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-330HV are connected to an isolated ground, the SE-330HV will be exposed to the GPR. If the GPR is greater than the terminal-block rating, the SE-330HV 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. An alternate configuration which allows an SE-330HV to be connected to station ground is shown in Fig. 19. The SE-330HV 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-bed-resistance 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-330HV 3 STATION GROUND BUS STATION GROUND BED ISOLATED GROUND BED REMOTE GROUND FIGURE 19. Simplified Isolated-Ground Connection. SE-330HV Neutral-Grounding-Resistor Monitor 4. COMMUNICATIONS 4.1 LOCAL COMMUNICATION PORT The SE-330HV has an RS-232 local 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 COMMENTS NAME DCD RD TD DTR SG DSR RTS CTS RI 470 connected to +12 V Output to DTE from SE-330HV Input from DTE to SE-330HV Not connected Signal Ground 470 connected to +12 V Not connected 470 connected to +12 V Not connected 4.1.1 LOCAL DATA ACQUISITION The SE-330HV 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-330HV settings and switch states. Neutral voltage and current. Resistance change. Trip status. Pending trips. Relay and LED status. NGR calibration value. - Expected 100-k value: RNGR to (RNGR-4,000) - Expected 200-k value: RNGR to (RNGR-8,000) 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. Page 22 Rev. 4-A-112913 4.1.2 LOCAL COMMUNICATIONS COMMANDS As of firmware revision 10, the SE-330HV supports basic 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-330HV 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 www.littelfuse.com/protectionrelays. at 4.2 NETWORK COMMUNICATIONS The SE-330HV interface for optional communications modules supports DeviceNet™, PROFIBUS®, and Ethernet: DeviceNet™: DeviceNet Slave. DeviceNet specification Vol 1:2.0, Vol 2:20. 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-330HV 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. Page 23 Rev. 4-A-112913 SE-330HV Neutral-Grounding-Resistor Monitor 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-330HV 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-330HV 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-330HV Neutral-Grounding-Resistor Monitor 6. TECHNICAL SPECIFICATIONS 6.1 SE-330HV 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-15KV to ER-35KV ...... 100; 300; 500; 650; 850; 1,000; 1,700; 4,000; 6,000; 8,500; 10,000 Vac ER-72KV ............................ 200; 600; 1,000; 1,300; 1,700; 2,000; 3,400; 8,000; 12,000; 17,000; 20,000 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-15KV to ER-35KV ...... 0 to 10 k ER-72KV ............................ 0 to 20 k Trip Resistance, VN = 0: ER-15KV to ER-35KV ...... 2.5-k change ± 1 k ER-72KV ............................ 5-k change ± 2 k DC-Voltage Rejection: ER-15KV to ER-35KV ...... 125 Vdc ER-72KV ............................ 250 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 Page 24 Rev. 4-A-112913 CT-Input Burden: 5-A Input ............................. < 0.01 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 Trip 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 maximum Auto-reset time ............................. 2.8 s maximum SE-330HV Neutral-Grounding-Resistor Monitor 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 kb/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 C37.90.1-1989 (Oscillatory and Fast Transient) EMC .............................................. EN 55011:1998 Certification .............................. CSA, Canada and USA R C LR 53428 US UL Listed Australia(1) NOTES: (1) See Ordering Information. Page 25 Rev. 4-A-112913 6.2 SENSING RESISTORS Environment: Operating Temperature............ -40 to 60°C (-40 to 140°F) Storage Temperature................ -55 to 80°C (-67 to 176°F) ER-15KV: Maximum Voltage ................ 8,400 Vac Maximum Current ................. 84 mA Resistance ............................. 100 k Thermal: 8,400 Vac ......................... 1 minute on, 120 minutes off 1,900 Vac ......................... Continuous Torque (Terminal N) ............... 9.0 N-m (80 in-lb) Shipping Weight ...................... 5.0 kg (11 lb) ER-25KV: Maximum Voltage ................ 14,400 Vac Maximum Current ................. 144 mA Resistance ............................. 100 k Thermal: 14,400 Vac ....................... 1 minute on, 120 minutes off 2,500 Vac ......................... Continuous Torque (Terminal N) ............... 9.0 N-m (80 in-lb) Shipping Weight ...................... 20 kg (44 lb) ER-35KV: Maximum Voltage ................ 22,000 Vac Maximum Current ................. 220 mA Resistance ............................. 100 k Thermal: 22,000 Vac ....................... 1 minute on, 120 minutes off 3,000 Vac ......................... Continuous Torque (Terminal N) ............... 9.0 N-m (80 in-lb) Shipping Weight ...................... 40 kg (88 lb) ER-72KV: Maximum Voltage ............... 44,000 Vac Maximum Current ................ 220 mA Resistance ............................ 200 k Thermal: 44,000 Vac ...................... 1 minute on, 120 minutes off 6,000 Vac ........................ Continuous Torque (Terminal N) .............. 9.0 N-m (80 in-lb) Shipping Weight ..................... 95 kg (210 lb) ER-1000HV: Maximum Voltage ............... 600 Vac Maximum Current ................ 3 mA Resistance ............................ 200 k Thermal ................................... 600 Vac Continuous Shipping Weight ..................... 300 g (0.7 lb) Page 26 Rev. 4-A-112913 SE-330HV Neutral-Grounding-Resistor Monitor Certification.............................. CSA, Canada and USA R C LR 53428 US UL Listed CE, European Union(1) NOTES: (1) CE certification for the ER-72KV is not available. 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-330HV- - K4 Contact: 0 N.O. UNIT HEALTHY Contact 1 N.C. UNIT HEALTHY Contact Options: 0 No Options 1 C-Tick Compliance Network Communications 0 None 1 DeviceNet™ 2 PROFIBUS® 3 Ethernet Supply: 0 Universal ac/dc Supply 2 48 V 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-330hv. NOTE: Each SE-330 includes an SE-330-SMA Surface Mount Adapter. SE-330HV Neutral-Grounding-Resistor Monitor Sensing Resistors: 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 ER-72KV ................................ For system voltages up to 72 kVac ER-1000HV............................ For system voltages up to 1 kVac 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 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-1000HV Software: (1) SE-FLASH ............................. Firmware Upgrade Program SE-MON330 .......................... SE-330 Data-Display Program for PC NGR Monitor Set-Point Assistant ................. Setting Guide NOTES: (1) Available at www.littelfuse.com/relayscontrols. Page 27 Rev. 4-A-112913 8. WARRANTY The SE-330HV 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-330HV 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. SE-330HV 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-330HV. 9.1.1 CALIBRATION AND OPEN TEST Test Equipment: 100-k and 200-k, 1/4-watt, 1% calibration resistors (calibration resistors supplied with SE-330HV). Procedure: Remove connections to terminals 6 and 7. 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-330HV should trip on resistor fault. Connect the 200-k resistor to terminals 6 and 7. Set switch S5 to the 200-k position. Perform calibration as per Section 2.2. The CALIBRATED LED should be on. Press RESET. Remove the 200-k resistor and wait for 12 seconds. PASS: The SE-330HV 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 250 Vac voltage source and multimeter. NOTE: Use an isolation transformer if the test-voltage source does not provide dc continuity for the SE-330HV resistancemeasuring circuit. NOTE: Applying the test voltage to the R and G terminals will damage the SE-330HV 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-330HV. Disconnect the wire from sensing-resistor terminal N. A resistor-fault 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 100. Press RESET. The RESISTOR FAULT TRIP LED should be off. Increase the test voltage to 120 Vac for 100-k sensors or 240 Vac for 200-k sensors and wait 12 seconds PASS: The SE-330HV should trip on RESISTOR FAULT. A time-delayed ground-fault trip follows the Page 28 Rev. 4-A-112913 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 98 and 102 k for 100-k sensing resistors. Resistance should be between 196 and 204 k for 200-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. 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-330HV 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. SE-330HV Neutral-Grounding-Resistor Monitor 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. 20 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. Inject the test current through the current-transformer 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. DATE Page 29 Rev. 4-A-112913 TABLE 4. GROUND-FAULT-TEST RECORD TEST RESULTS 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. NEUTRAL NOTE 1 TO SE-330HV TO SENSING RESISTOR TERMINAL N NGR L N 11 3 5 OP1 8 9 12 L1 L2 1 REMOTE INPUT OP2 SE-400 RMT1 RMT2 NOTE: 1. USE MULTIPLE WRAPS FOR TEST CURRENTS > 9.9 A. FIGURE 20. Ground-Fault-Test Circuit. Retain this record for the authority having jurisdiction. SE-330HV Neutral-Grounding-Resistor Monitor This page intentionally left blank. Page 30 Rev. 4-A-112913