【摘要】 由于差动保护和后备保护的局限性,变压器中、低侧断路器和电流互感器之间发生故障时保护可能发生拒动的情况,给变压器和电网运行带来严重后果。为此在原有运行继电保护设备的基础上考虑增加一种以中、低侧断路器位置为辅助判据,通过保护内部逻辑判据和更改相应的外部接线来消除此处故障的继电保护方法。根据理论判断和现场模拟,该方法满足运行要求,达到设计目的。更多还原

【Abstract】 Transformers are expensive and extensively used in power system,which has a bearing on steady movement of power net.Because of the limitations of the protection,relay protection may mal-operate when takes place faults between main transformer’ middle-side or low-side circuit-breaker and current transformer.This situation will do harm to transformers and power net,so the paper discusses a method of relay protection which takes the site of the middle-side or low-side circuit-breaker as auxiliary judgement,increases judgement inside the pretection and alters corresponding outside wiring to eliminate the blind faults.According to theoretical judgement and on-the-spot imitation,this method meets the need of movement.更多还原