V I S H AY I N T E R T E C H N O L O G Y, I N C . ESTAsym CPR Vishay ESTA ESTAsym CPR Unbalance Protection Relay KEY BENEFITS • • • • • • • • • • • • • Compensation of the natural unbalance (current or voltage) of the capacitor bank Display of the actual unbalance current or unbalance voltage Self monitoring function with own alarm contact Separately adjustable thresholds and delay times for alarm and trip Adjustable drop-off-value for Alarm/Trip Separately programmable reset mode for Alarm/Trip (automatic or manual reset) In manual mode, after power interruption, memory of switching outputs, original state and display indications Adjustable transformer ratio (voltage/current) Thresholds and readings as current or voltage value or as percentage value related to the nominal input range of current or voltage channel Separate password protection for setup and operator menu Storage of the last five trips and alarms with maximum value during delay time One free programmable output relay (Rel.3) Display flashing as visual indicator under the Alarm/Trip condition RESOURCES • For technical questions contact [email protected] A WORLD OF SOLUTIONS PRODUCT OVERVIEW 1/4 THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 VMN-PL0455-1602 www.vishay.com V I S H AY I N T E R T E C H N O L O G Y, I N C . ESTAsym CPR Vishay ESTA The operation of high- and medium-voltage capacitors needs to be monitored constantly. Most such capacitors use insulating oil for their dielectrics, and monitoring is required to avoid any combustion of this material in event of failure. This monitoring can be done either by monitoring the unbalance current or unbalance voltage of capacitor groups. However, this voltage / current may change in case of any failure of one capacitor, for instance caused by a flashover inside the wound foils. Applications: Monitoring Unbalance Current Figure 1 Figure 2 c Double-Star Connection In a double-star connection, the star points of two capacitor groups are connected together as shown in Figure 1. In the event of a failure, i.e., element breakdown or group short-circuit, the star point of the respective branch is shifted and causes a current flow between the star points. The intensity of the current is determined by the capacitor construction and the number of capacitors. CPR CPR Figure 3 Bridge Connection In a bridge connection, as shown in Figure 2, the capacitor bank is built up with four bridge branches, with two branches each constituting a series connection. The medium potentials of the branches are connected by a current transformer. The division of the bridge branches preferably should be symmetrical. An unsymmetrical structure would also be possible. However, with an unsymmetrical structure, the pick-up values must be set to the more sensitive branch. L1 L2 L3 CPR 20 mA - 5 A 0.2 V - 20 V Monitoring Unbalance Voltage To monitor the capacitor bank via the voltage, the voltage of the capacitors of the three phases is connected to three two-pole insulated PTs, which are on the secondary side connected in series. In Figure 3, the ESTAsym CPR is measuring the voltage at this open delta. Hardware • Wide range of power supplies suitable for DC/AC voltages • X/1 or X/5, without conversion on the device • Mechanical NO and NC contacts for outputs • Measurement signal is passed via low-pass filter • Digital input to block alarm function • LCD with backlight • Sign of life signal • Capacitor protection relay in plastic case • Backside is made of metal PRODUCT OVERVIEW 2/4 THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 VMN-PL0455-1602 www.vishay.com V I S H AY I N T E R T E C H N O L O G Y, I N C . ESTAsym CPR Vishay ESTA Optional Features: Measured value - Natural unbalance = Value Interface RS485, Modbus RTU Programming via USB 2.0 interface Function Comparator Value > Limit Adjusted threshold Alarm / Trip The ESTAsym CPR is designed to monitor medium- and highvoltage capacitors. The ESTAsym CPR can be set from the menu to monitor current or voltage. The device can monitor Adjusted delay time Delay Time two threshold levels for Alarm/Trip. All thresholds/readings Output Relay 1 for Alarm / Trip Alarm / Trip can be set either as a specific current or voltage value or as Trip a percentage of the maximum value. Once the Alarm or Trip Output Relay 2 level is reached, the appropriate relay will operate, after the Alarm Monitoring programmed delay time has elapsed. Both output relays can Switch output relay blocked via DI1 & be programmed to be held in the Alarm/Trip position until reset Output Relay 3 DI2 by the user. Alternatively they can be set to automatically reset progr. if the fault condition has cleared. A further output relay can be used to operate when the Alarm/Trip or both Alarm+Trip have operated. The ESTAsym CPR can record details of the last five Alarm and Trip operations. An natural unbalance (out of balance or asymmetrical value) can be programmed into the device if required. This natural unbalance is subtracted from the measured value and allows a more exact setting of the thresholds. Technical Data 40 to 250 VAC, 45 to 65 Hz / 40 to 300 VDC, 5 VA; max fuse 6 A Measuring voltage: 0.2 to 20 V; burden 284 kΩ; vt-ratio from 1 to 350, with low pass filter Continuous overload: 120 V; Short term overload: 500 V for 10 seconds Accuracy: 0.5 % from upper range value Current measuring: 20 mA to 5 A; burden 20 mΩ; ct-ratio from 1 to 4000, with low pass filter Continuous overload: 25 A; Short term overload: 100 A for one second Accuracy: 0.5 % from upper range value (mm) 144 Relay outputs: Maximum output rating AC: 1250 VA, max switching voltage: 440 VAC Maximum output rating DC (ohmic): 30 V / 5 A; 60 V / 1 A; 110 V / 0.5 A; 220 V / 0.3 A TTL, rear (optional: RS485, Mod bus, RTU) Ambient temperature: Operation: - 20 °C to + 70 °C, storage: - 40 °C to + 85 °C Humidity: 0 % to 95 %, without moisture condensation Overvoltage class: II, pollution degree 3 (DIN VDE 0110, Teil 1 / IEC 60664-1) Standards: DIN VDE 0110 part 1 (IEC 60664-1:1992) VDE 0411 part 1 (DIN EN 61010-1 / IEC 61010-1:2001) VDE 0843 part 20 (DIN EN 61326 / IEC 61326: 1997+ A1:1998 +A2: 2000) Conformity and listing: CE Terminals: Screw-type, maximum 4 mm2 Casing front: Instrument casing plastic (UL94-VO), rear: metal Protection class Front: IP50, (IP54 by using a gasket), Rear: IP20 Weight: Approximately 0.65 kg PRODUCT OVERVIEW 3/4 THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 8.5 Interface: 47 12 138 Blocking Alarm / Trip via digital input 8.5 Digital input: 144 Supply voltage: 138 VMN-PL0455-1602 www.vishay.com V I S H AY I N T E R T E C H N O L O G Y, I N C . 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THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 VMN-PL0455-1602 www.vishay.com