DIN EN IEC 62146-2:2025-02

This part of the IEC 62146 series of standards 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 document 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. This standard describes the requirements for basic, type, and unit tests of TRV capacitors. The requirements relate, for example, to the rated voltage, insulation level, frequency, capacitance tolerance, and many other parameters. This document does not apply to grading capacitors installed in parallel to the chambers of the circuit-breaker, which are specified in IEC 62146-1. This document does not apply to capacitors not directly associated with high-voltage alternating current circuit-breakers. It provides basic parameter descriptions for testing and agreements between manufacturers and buyers. The purpose of this standard is to establish uniform rules for operating characteristics, testing, and rating. In addition, specific safety rules are defined and instructions for installation and operation are provided.