NG TS 3.24.83
National Grid Technical Specifications - Circuit Breaker Sequential Isolation
|Publication Date:||1 June 2001|
This specification covers the functional requirements for sequentially operated disconnectors operating at 420, 300 and 145kV. This facility is typically associated with pressurised head air-blast circuit breakers but may also be applied to other types of circuit breaker or form part of the automatic switching regime for plant or feeder isolation.