大型发电机组失磁故障的分析与处理  

Analysis and Treatment of Excitation Loss Fault for Large Generating Units

作　　者：肖华宾 赵曙伟[2] 

机构地区：[1]神华广东国华粤电台山发电有限公司,广东台山529228 [2]苏州热工研究院有限公司,广东深圳518120

出　　处：《电气自动化》2017年第3期61-64,共4页Electrical Automation

摘　　要：接入电网的大型发电机组发生故障后,会影响到系统的运行稳定性,继电保护的任务就是快速的、可靠的、有选择的将故障切除,维持系统稳定,因此对继电保护装置提出不误动、不拒动的基本要求。同时为尽快恢复电力输出,就必须快速定位故障点,并做相应的故障排除。针对一起由于励磁系统电源故障引起的发电机失磁保护动作事件,分析保护动作行为的正确性,开展一、二次设备的全面检查,并采取有效的故障隔离措施,经静态、动态测试证明是行之有效的,终使机组在最短的时间内投入商业运营。A failure of a large generating unit connected to the power grid will affect stability of system operation, and the task of relay protection is to remove the fault in a rapid, reliable and selective way and keep the system stable. In this background, it is basically required that the relay protection device should have no maloperation or refusing action. On the other hand, to restore electric output as soon as possible, it is necessary to quickly locate the fault point and remove the fault correspondingly. For an event of excitation toss protection of the generator caused by a power failure in the excitation system, we analyse correctness of the protection action, carry out a comprehensive inspection of primary and secondary equipment, and take effective measures to isolate the fault. Static and dynamic tests prove that these are effective measures which eventually put the generating unit into commercial operation in the shortest possible time.

关 键 词：失磁 励磁系统 阻抗 机端电压 转子 

分 类 号：TM77[电气工程—电力系统及自动化]