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PT失压导致发电机失磁分析及预防

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针对某水电厂在试运期间,出现发电机PT二次侧失压造成失磁保护拒动,发电机失磁,最终过流保护动作停机事故,阐述了发电机失磁对发电机、电力系统危害.分析并查找了事故原因,制定了相应的电压二次回路及励磁调节器改进措施,对避免因发电机因PT二次侧失压造成机组异步运行甚至失磁事故具有一定的借鉴意义.
Analysis and Prevention of Generator Loss of Excitation Caused by PT Voltage Loss
During trial operation of an actual hydroplant,it encountered an overcurrent protection activated shutdown acci-dent caused by PT secondary side voltage loss induced action refusal of loss of excitation protection.In view of this acci-dent,this paper describes the harm to generator and power system due to loss of excitation,analyzes and seeks cause of the accident,and formulates corresponding improvement measures for voltage secondary circuit and excitation regulator.The paper may be useful to avoid PT secondary side voltage loss and asynchronous operation or even loss of excitation of generators.

generatorvoltage lossloss of excitation

庞宏强

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西安益通热工技术服务有限责任公司,陕西 西安 710032

发电机 失压 失磁

2024

电工技术
重庆西南信息有限公司(原科技部西南信息中心)

电工技术

影响因子:0.177
ISSN:1002-1388
年,卷(期):2024.(1)
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