300MW 发电机机组定子系统绝缘降低监测探讨
于菲
大唐哈尔滨第一热电厂,哈尔滨市道里区新发镇建国村 6 号 150078;
300MW generator stator insulation monitoring
system of lower
Yu Fei
Harbin Daoli District of new town of the village of 6 150078
ABSTRACT: Generator stator winding insulation in 根据《防止电力生产重大事故的二十五项重
the operation of the system only rely on the stator 点要求》规定:“当定子接地保护报警时,
ground fault protection, can't realize the early forecast 应立即停机。200MW 及以上容量的发电机
reflect. When the stator insulation system occurring 的接地保护装置应作用于跳闸。”实现这一
after destroyed to certain degree, the stator ground 要求的装置为发电机 100%定子接地保护。
fault protection action tripped. This paper, through the 为保证保护的灵敏度,整定值均很小,一旦
point system to determine repair of generating 发现发电机发生单相接地故障,动作于跳
conveying rate means the sides, neutral ratio of 闸。造成发电机组非停。那么有没有一种方
3rdharms blast and power generation, the relatively 法能在发电机定子绝缘降低而又没有达到
voltage variation trend analysis in generator stator 绝缘破坏的过程中发现绝缘降低适时安排
insulation system, timely discovery, arrange early 计划检修。这样既可以避免发电机非停事
decline, avoid insulation repair damage accidents. 件,又可以降低损失、缩短消除时间。经过
探索,笔者认为可以借助双频式 100%定子
KEY WORD: generator stator system insulation,
接地保护,开展点检定修工作,监视发电机
3rdharms ratio, point to determine repair means, trend
两侧三次谐波电压比及机端三相电压的变
analysis forecast.
化情况来达到此目的。
摘要:发电机定子绕组系统绝缘运行中只有依靠发 1 300MW 发电机定子系统结构及发生单
电机定子接地保护反映,不能实现早期预报。当定相接地的几种典型现象
子系统发生绝缘被破坏到一定程度后,由定子接地
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