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prEN IEC 62146-2:2022

Grading capacitors for high-voltage alternating current circuit-breakers - Part 2: TRV capacitors

General information
Draft
Base Documents
33/673/CDV; prEN IEC 62146-2:2022
Directives or regulations
None
Standard history
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This part of the IEC 62146 series is applicable to TRV capacitors used on high -voltage alternating current circuit-breakers with rated voltages above 100 kV with 50 Hz or 60 Hz. TRV capacitors are installed phase to earth, either in parallel to the bushing on dead tank circuit-breakers, or immersed inside the circuit-breaker, or freestanding close to the circuit-breaker. Their function is to limit the transient recovery voltage (TRV) and the rate of rise of recovery voltage (RRRV) on the circuit-breaker. Capacitors in compliance with this standard can be used as TRV capacitor. This standard applies to TRV capacitors falling into one or both of the following categories for: – mounting on or close to air insulated switchgear (AIS) dead tank and live tank circuit-breakers, or – mounting on gas insulated switchgear (GIS) circuit-breakers. The testing for each of the above applications is in some cases different. This standard does not apply to grading capacitors installed in parallel to the chambers of the circuit-breaker, which are specified in IEC 62146-1. This standard does not apply to capacitors not directly associated with high-voltage alternating current circuit-breakers. The object of this standard is: – to define uniform rules regarding performances, testing and rating – to define specific safety rules – to provide a guidance for installation and operation NOTE 1: The TRV capacitor is a sub-component for the circuit-breaker and shall be specified in accordance with the circuit-breaker specifications according to IEC 62271-1, IEC 62271-100, and if applicable to IEC 62271-203. NOTE 2: TRV capacitors are commonly built with composite or ceramic housings (insulators). Those insulators shall follow IEC 61462 or IEC 62155. Other housings can be used if they can sustain applicable type tests according to IEC 61462 and IEC 62155.
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