ABB - High voltage dead-tank circuit breaker 362 kV, max. 63 kA 362PMI

Circuit breakers

The circuit breakers operate according to the dynamic self-compression principle. The number of interrupting units per phase depends on the circuit breaker’s performance. The arcing chambers and the circuit breaker contacts are freely accessibly.

The circuit breaker is suitable for out-of-phase switching and designed to minimize overvoltages. The specified arc interruption performance has to be consistent across the entire operating range, from line-charging currents to full short circuit currents.

The circuit breaker is designed to withstand at least 10 operations (depending on the voltage levels) at full short circuit rating.

Opening the circuit breaker for service or maintenance is not necessary. The maximum tolerance for phase displacement is 3ms, that is, the time between the first and the last pole’s opening or closing.

A standard station battery that is required for control and tripping may also be used for recharging the operating mechanism.

The drive and the energy storage system are provided by a stored energy spring mechanism that holds sufficient energy for all standard IEC close-open duty cycles.

The control system provides alarms signals and internal interlocks but inhibits tripping or closing of the circuit breaker when the energy capacity in the energy storage system is insufficient or the SF6 density within the circuit breaker drops below the minimum permissible level.