旁路断路器代主变断路器时快速保护死区的消除方法

旁路断路器代变压器断路器运行,变压器差动保护的交流回路被切换到变压器套管侧电流互感器后,形成了一段无快速保护的区域。如不快速切除该区域内的故障,将严重威胁电力系统的安全稳定运行。提出了利用旁路保护实现快速切除该区域内故障的方案,探讨了带变压器运行时旁路保护整定计算的原则。

Eliminating the dead-zone without instant protection when pass-by CB replaces the CB of main transformer

If pass-by CB(circuit breaker) replaces the CB of main transformer, the circuit of differential protection will change from the CT of the breaker to the bushing type CT of the main transformer, which will bring a dead-zone without instant protection. It is dangerous to the safety of the power system if the fault in the dead-zone cannot be cut off immediately. This paper brings forward a solution to solve the above problem by using the protection of the pass-by CB, and discusses how to calculate the settings in this case.