发电机转子一点接地保护系统配置及应用研究  

Study on configuration and application of generator rotor one-point grounding protection system

作　　者：徐亮 纪可可 黄文明 

机构地区：[1]雅砻江流域水电开发有限公司二滩水力发电厂,四川攀枝花617000

出　　处：《人民长江》2015年第23期46-49,共4页Yangtze River

摘　　要：目前国内发电机转子一点接地保护装置在设计时大多是采用惠斯通电桥式、切换采样式(乒乓式)、注入方波电源式以及注入直流电压等原理,基于上述原理设计和制造出的保护装置在独立使用时存在着动作死区大、保护选择性差、灵敏度低和无法实时显示转子绝缘变化趋势等缺点。为此,结合桐子林水电站发电机转子接地保护系统的配置、应用以及整定计算等展开了研究。研究结果表明,选取合理的发电机转子接地保护系统组合配置方案,能够有效且及时地发现转子绝缘下降的趋势,并发出绝缘降低预报警信号;而且利用两套不同原理的转子接地保护装置可以确认所发出的报警及跳闸信号。Current domestic generator rotor one- point grounding protection devices are mostly based on principles of Wheatstone bridge,switch sampling（ ping pong）,square wave power injection and DC voltage injection,etc. Drawbacks like large operating dead zone,poor protective selection,low sensitivity and inability to display real time rotor insulation variation tendency exist in independently operating protecting device. To overcome these drawbacks,the configuration,application and setting calculation of the generator rotor grounding protection system of Tongzilin Hydropower Station are studied. The results show that an appropriately- selected configuration scheme of the generator rotor grounding protection system can effectively and promptly discover the decline tendency of the rotor insulation,sending warning signal,and confirm the warning and trip- out signals through the rotor grounding protection system based on two different principles.

关 键 词：发电机转子 一点接地 接地保护 绝缘监测 桐子林水电站 

分 类 号：TV734[水利工程—水利水电工程]