| 引用本文: | 姬希军,黄生春,樊平,赵哲.一起主变保护误动作事故的分析与处理[J].电力自动化设备,2007,27(1):125-127 |
| .Analysis and disposal of primary transformer protection misoperation[J].Electric Power Automation Equipment,2007,27(1):125-127 |
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| 摘要: |
| 介绍了湍州变2号主变一起间隙零序保护跳闸事故的相关情况,通过检查保护动作报告及定值,进行现场保护特性试验、绝缘检查、二次回路电压测量。经过分析,得出事故原因:电气回路问题,中性点回路中,TV1和TV2的二次中性点为通过避雷间隙且不并列运行方式,由于错引二次中性点使电势参照点偏移,形成了电位差从而产生零序电压;保护中的定值整定不合适,不符合保护整定规程。以上2个问题造成了2号主变间隙零序保护跳闸事故。最后,针对该设备运行中以上2个缺陷采取了纠正措施。 |
| 关键词: 保护误动,间隙零序,中性点,差电压 |
| DOI： |
| 分类号:TM772 |
| 基金项目: |
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| Analysis and disposal of primary transformer protection misoperation |
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JI Xi-jun HUANG Sheng-chun FAN Ping ZHAO Zhe
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| Abstract: |
| The incident of primary transformer No.2 clearance zero sequence protection trip in Tuanzhou substation is introduced.Event reports and protective settings are checked,and protective characteristics,insulation and secondary circuit voltage are tested on site.The data analysis points out that,the fault is in the neutral point circuit:the secondary neutral points of PT1 and PT2 are of non-parallel operation mode via lightning gap,which causes the reference voltage offsetting.This potential difference produces zero sequence voltage,while protective settings are improper,not conforming to operating regulations of relay protection.Countermeasures are taken. |
| Key words: protection misoperation,clearance zero sequence protection,neutral point,potential difference, |
