ESTAsym W www.vishay.com Vishay ESTA Unbalance Monitoring FEATURES • Indoor or outdoor version available • Special design to fit capacitor banks assemblies with IP55 terminal covers APPLICATIONS • Monitoring unbalance currents of capacitor banks - Double-star connection - Bridge connection • Monitoring unbalance voltages of capacitor banks QUICK REFERENCE DATA Description Unbalance measuring device for capacitor banks connected in double-star or bridge connection Type Unbalance monitoring Rated primary current 5 A / 10 A / 25 A / 50 A Rated secondary current 1A Accuracy class Class 1 VA-rating 1.5 VA Maximum overload Frequency Temperature Insulation level Installation Protection level 200 A/1s 50 Hz / 60 Hz -30 °C to +65 °C 12 kV (28 kV / 75 kVp) or 17.5 kV (38 kV / 95 kVp) Indoor and outdoor version available IP00 APPLICATION When a short circuit occurs in the winding element of a capacitor unit, gas can form, causing the capacitor case to swell and eventually burst if left uncontrolled. A protection relay can be used to detect such faults well in advance. The relay compares the star points of two parallel star connected capacitor arrangements. As soon as there is a voltage shift in one of the star points, an unbalanced current will flow between the two star points. The protection relay can be configured to indicate the fault and disconnect the faulty capacitors when this tripping current goes over a predetermined value. Capacitor banks arranged in a bridge circuit can also be controlled by the ESTAsym W, which in such cases is connected in the midpoint of the bridge (Fig. 2). The combination of an ESTAsym W and ESTAsym Relay can recognize winding element failure early on and disconnect the capacitor bank before any significant damage occurs. Revision: 15-Sep-14 Document Number: 13175 1 For technical questions, contact: [email protected] 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 ESTAsym W www.vishay.com Vishay ESTA SETTING OF TRIPPING VALUE The choice of the appropriate tripping value for the unbalanced current depends on how the capacitors are connected internally and upon the external arrangement of the capacitor bank. Factory recommendations for alarm and / or tripping values as well as time delays are included in the contractual documentation supplied with each capacitor bank at time of delivery. L1 L1 L2 L3 ESTAsym® W ESTAsym® W ESTAsym® W L2 L3 C1 C2 C3 C4 C5 C6 Relay ESTAsym® W Relay Fig. 1 - Double-star connection Fig. 2 - Bridge connection FACTORY TESTS Because the ESTAsym W is intended exclusively to protect capacitor banks, we use the testing voltages specified by the IEC 60871 standard for capacitors in performing our insulation test for the ESTAsym W. This means that on the basis of insulation class 12 kV or 17.5 kV the primary sides are tested to the secondary side / housing with 28 kV AC/10 s or 38 kV AC/10 s respectively. The test of the secondary side to the housing is made with a voltage of 2.5 kV AC for 10 s. TESTING THE ESTAsym W FOR PROPER FUNCTIONING For reliable operation, we recommend a regular examination of the complete capacitor protection set-up. The operation of the alarm and trip levels for the protection circuits are best confirmed though primary current injection of the ESTAsym W. Following an alarm or trip operation, the capacitor bank should only be re-energized after it has been thoroughly inspected. Fig. 3 - Indoor type with bushing D-199 Fig. 4 - Outdoor type with bushing D-401 Revision: 15-Sep-14 Document Number: 13175 2 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. 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Vishay Intertechnology, Inc. hereby certifies that all its products that are identified as Halogen-Free follow Halogen-Free requirements as per JEDEC JS709A standards. Please note that some Vishay documentation may still make reference to the IEC 61249-2-21 definition. We confirm that all the products identified as being compliant to IEC 61249-2-21 conform to JEDEC JS709A standards. Revision: 02-Oct-12 1 Document Number: 91000