快速切除220 kV变压器死区故障的继电保护方案

由变压器电源侧后备保护动作或联跳变压器其他侧断路器的方法,来切除220kV变压器某侧断路器与变压器差动保护电流互感器(TA)之间发生的死区故障,切除故障时间较长;由于是变压器出口故障,容易造成变压器损坏。分析了220kV变压器各侧死区故障的故障特征和有关的继电保护动作特征,借鉴现运行的母线差动保护中母联断路器死区故障保护和线路断路器死区故障保护的原理,提出了4种快速切除220kV变压器各侧死区故障的保护方案,并研究了变压器死区故障保护短延时的合理取值。

Relay Protection Scheme of Rapid Removal of 220 kV Transformer Fault

It takes a rather long time to remove a dead zone fault occurring between the breaker on a certain side of the 220 kV transformer and the transformer differential protection mutual inductor by means of the supply side of transformer backup protection action or another side of the transformer circuit breaker tripping. As this is a transformer exit fault, it is likely to cause damage to the transformer. An analysis is made of the fault characteristics during 220 kV transformer fault in dead zones on all sides of the transformer and the related protective action features. By drawing on the principles of currently operating bus differential protection in the tie breaker failure protection and the dead zone circuit breaker failure protection, four protection principle schemes of fast removal of dead zone on each side of 220 kV transformer fault are proposed and rational value taking for the dead zone fault protection transformer short delay is studied.