This part of the IEC 62146 series includes generalities of capacitors used on alternating current circuit-breakers and introduce specifications for grading capacitors. Regarding grading capacitors, their function is to control the voltage distribution across the individual interrupter units of a multi-break circuit-breaker.
Capacitors can also be used in parallel to the interrupter unit on single break circuit-breakers to modify the Transient Recovery Voltage (TRV). This TRV capacitor application is covered by the IEC 62146-2:2023 standard.
Capacitors for high-voltage alternating circuit breakers 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.
This standard applies to grading capacitors falling into one or both of the following categories for:
− mounting on air-insulated circuit-breakers.
− mounting on enclosed circuit-breakers (for example immersed in insulating gas, in oil, etc.).
The testing for each of the above applications is in some cases different.
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 CIGRE TB-368 presents a study about the operating environment of voltage grading capacitors applied to high-voltage circuit-breakers (see [2]).
This standard does not apply to capacitors not directly associated with high-voltage alternating current circuit-breakers.
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