华电技术 ›› 2019, Vol. 41 ›› Issue (8): 38-43.

• 研究与开发 • 上一篇    下一篇

注入式定子接地保护现场试验、分析及建议

  

  1. 南京国电南自电网自动化有限公司,南京〓211100

  • 出版日期:2019-08-26 发布日期:2019-09-06

Field test, analysis and recommendations for injection stator grounding protection

  1. Nanjing SAC Power Grid Automation Company Limited, Nanjing 211100, China

  • Online:2019-08-26 Published:2019-09-06

摘要:

以某电厂1008MW汽轮发电机组的注入式定子接地保护现场试验为例,结合注入式定子接地保护原理,详细介绍了注入式定子接地保护精度影响因素、相位补偿试验、阻抗补偿试验、并联电阻补偿试验、电阻折算系数校正试验和动态模拟试验的方法,同时给出了接地零序电流定值和回路监视定值整定的建议;试验数据误差在5%以内,证明现场各项补偿试验是合理的。另外,对现场试验过程出现的20Hz电压信号异常、20Hz电流信号异常、相角差异常和接地电阻异常等问题,给出了针对性的测量回路检查建议;对注入定子接地保护的启动失灵、启停机过程闭锁、多段相角补偿和对同期及测转速装置的影响等应用问题进行分析,给出了动作延时整定、频率闭锁、多段相角补偿时机和同期电压选取等建议。

关键词:

font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">发电机, 注入式定子接地保护, 现场试验, 整定

Abstract:

Taking the field test of injection stator grounding protection of a 1008MW steam turbine generator set in a power plant as an example,combining its protection principle,methods for the influencing factors of accuracy, phase compensation test,impedance compensation test,parallel resistance compensation test,resistivity correction factor test and dynamic simulation test are introduced in detail.At the same time,suggested setting values for grounding zerosequence current and the loop monitoring are given.The error of the test data is below 5%, which verifies the rationality of compensation tests.In addition, targeted approach for loop inspection are give for solving anomalies in 20Hz voltage signal,20Hz current signal,phase angle difference and grounding resistance during the field test.Analysis on failure startup of the injection stator grounding protection,blocking during startstop process,multiphase angle compensation and the influence on synchronous and speed measuring device are made.And the recommendations for action delay setting,frequency blocking, timing for multiphase angle compensation and synchronous voltage selection are made.

Key words:

font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">generator;injection stator grounding protection;field test;setting