摘要
提出了一种发电机励磁回路接地保护的新原理 ,利用双电桥间检测电阻的电压差值判断出电机转子一点接地故障后 ,再利用前后检测电阻电压差的变化量来完成转子两点接地保护。新一点接地保护原理无死区 ,灵敏度高 ,而且各点接地的保护灵敏度基本相同。两点接地故障保护判据的整定值按照转子一点接地故障时的过渡电阻自适应调整 ,并且整定值与两个接地点之间的绕组匝数无关 。
This paper presents a new relaying scheme for the single and double ground faults in the field winding of synchronous generator. It completes the double ground fault protection by using the variation of voltage difference after the single ground fault has been detected by monitoring the difference of voltages of detecting resistance between dual bridge circuits. The new criterion of the single protection eliminates the blind spot with high sensitive and the sensitive is nearly same at different fault positions. The setting of double ground fault is adaptive according to the ground fault resistance of the single one and has nothing to do with the number of windings between two fault positions, so the sensitive is improved.
出处
《继电器》
CSCD
2000年第7期37-40,54,共5页
Relay
关键词
励磁回路
发电机
接地保护
绝缘电阻
field winding
ground fault
dual bridge circuit
adaptive
