零序功率方向保护继电器新型校验方法
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摘要
零序功率方向保护继电器(简称67)是电动机或电缆线路上发生单相接地故障时的主保护,对于防止故障范围扩大,保障系统安全运行方面起着重要作用。定期校验零序功率方向保护继电器动作的正确性、灵敏性就显得尤为重要。常规的校验方法主要是通过逐台单体检验,不仅拆接线繁琐而且未将电压、电流互感器二次线接入试验回路,从而无法验证其接线正确性。如何在保护验收及日常定检工作中简单而又准确地检验零序功率方向保护继电器,是新型校验方法研究的主要目的。
The zero-sequence power direction protection relay(67), as the main protection of the motor or cable when single-phase earth fault occurs on the road, can prevent failure of expanding, and play an important role in ensuring the safe operation of the system. Therefore, it is particularly important to check its accuracy and sensitivity regularly. At present, tconventional verification method is mainly through the single device test, which is not only cumbersome to disassemble and connect, but also fails to connect the CT and PT secondary line into the test circuit, so as to verify the correctness of its wiring. How to check the zero sequence power directional protection relay simply and accurately is the main purpose of the new calibration method.
The zero-sequence power direction protection relay(67), as the main protection of the motor or cable when single-phase earth fault occurs on the road, can prevent failure of expanding, and play an important role in ensuring the safe operation of the system. Therefore, it is particularly important to check its accuracy and sensitivity regularly. At present, tconventional verification method is mainly through the single device test, which is not only cumbersome to disassemble and connect, but also fails to connect the CT and PT secondary line into the test circuit, so as to verify the correctness of its wiring. How to check the zero sequence power directional protection relay simply and accurately is the main purpose of the new calibration method.
引文
[1] 朱声石.高压电网继电保护原理与技术[M].北京:中国电力出版社,1995.
[2] 王维俭.电气主设备继电保护原理与应用[M].北京:中国电力出版社,1996.
[3] 张旭俊,上官帖,唐建洪,等.采用零序功率绝对值构成反时限零序电流保护的方案探讨[J].电力系统保护与控制,2009,37(23):41-44. ZHANG Xujun, SHANGGUAN Tie, TANG Jianhong, et al. Research on inverse time current relay based on the absolute value of zero-sequence power[J]. Power System Protection and Control,2009,37(23):41-44.
[2] 王维俭.电气主设备继电保护原理与应用[M].北京:中国电力出版社,1996.
[3] 张旭俊,上官帖,唐建洪,等.采用零序功率绝对值构成反时限零序电流保护的方案探讨[J].电力系统保护与控制,2009,37(23):41-44. ZHANG Xujun, SHANGGUAN Tie, TANG Jianhong, et al. Research on inverse time current relay based on the absolute value of zero-sequence power[J]. Power System Protection and Control,2009,37(23):41-44.