摘要
330 kV及以上超高压大容量自耦变压器常配有零序电流差动保护,以提高接地故障时保护动作的灵敏性。对一座330 kV变电站的360 MVA自耦变压器在空载投运时和用中压侧开关向110 kV母线充电时,微机保护记录的采样值及波形数据进行分析,阐明了零序电流差动保护用工作电压和负荷电流检验其电流二次接线正确性的方法。该变压器保护投运至今已经受了多次区外故障的考验,该方法具有一定的工程实用价值。
To enhance the sensitivity of ground fault proteftion, 330 kV and its above EHV large capacity autotransformers are equipped with aero-sequence current differential protection.This paper analyses the sample values and wave record when autotransformer no-load operates and 1 t0 kV bus charges. It proposes working voltage of zero-sequence differential protection and its secondary connection＇ s testing way. This transformer has survived many external fault, which shows that the method is practical.
出处
《继电器》
CSCD
北大核心
2007年第8期66-69,共4页
Relay
关键词
自耦变
零差保护
二次接线
判断
autotransformers： differential protection
secondary connection
judgment
