摘要
以零序电压为参考方向的零序方向元件存在电压死区问题,需采取措施解决。对此,提出一种基于变压器中性点接地电流幅值比较原理的零序方向元件,分析了新型零序方向元件的工作原理与性能。分析表明,基于变压器中性点接地电流幅值比较的零序方向元件没有电压死区问题。幅值比较零序方向元件有较高灵敏度,且相位比较动作判据在最灵敏时幅值比较动作判据也最灵敏。
The zero-sequence element with the zero-sequence voltage as the reference direction has a voltage dead zone problem,which needs to be solved.A zero-sequence directional element based on the principle of comparing the neutral point ground current amplitude of a transformer was designed.The working principle and performance of the new zero-sequence directional element were analyzed.The analysis showed that the zero-sequence directional element based on the comparison of the amplitude of the neutral point grounding current of the transformer had no voltage dead zone problem.The amplitude comparison zero-sequence direction element had higher sensitivity,and the phase comparison action criterion was also the most sensitive when the phase comparison action criterion was most sensitive.
作者
鲍鹏飞
李晓明
范文魁
陈超
BAO Pengfei;LI Xiaoming;Fang Wenkui;CHEN Chao(Shenzhen Power Supply Co.,Ltd.of China Southen Power Grid,Shenzhen 518048,China;E.E.College of Shandong University,Jinan 250061,China)
出处
《电工技术》
2020年第7期32-33,37,共3页
Electric Engineering
关键词
零序方向元件
幅值比较
灵敏度
零序电流
zero-sequence directional relay
amplitude comparison
sensitivity
zero sequence current
