发电厂电压互感器高压熔断器熔断原因分析

华电技术 ›› 2012, Vol. 34 ›› Issue (9): 23-26.

发电厂电压互感器高压熔断器熔断原因分析

豆占良，邹晖，于蒙

华北电力大学电气与电子工程学院，北京102206

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2012-09-25 发布日期:2012-09-25

Analysis on reason of PT highvoltage fuse blow in a power plant

DOU Zhanliang, ZOU Hui, YU Meng

School of Electric and Electronic Engineering, North China Electric Power University, Beijing 102206, China

Received:1900-01-01 Revised:1900-01-01 Online:2012-09-25 Published:2012-09-25

摘要/Abstract

摘要： 发电机的中性点一般是经消弧线圈接地的，系统运行过程中有时会发生电压互感器(PT)高压熔断器熔断(俗称爆保险)现象，给系统造成了不利影响。通过分析中性点经消弧线圈接地发电厂的运行特点，发现中性点位移电压的放大是造成PT爆保险的重要原因。提出了利用电力电子开关串入阻尼电阻来抑制中性点电压的放大，进而防止发电厂PT爆保险的方案。以某水电厂为实例，验证了该方案的有效性。

关键词: 电压互感器, 爆保险, 中性点位移电压, 阻尼电阻, 电子开关

Abstract: The neutral point of the generator often grounded through a blowout coil. In system operation process of a power plant, the highvoltage fuse of potential transformer may blow and make negative influence on the system sometimes. The operation features of the power plants were analyzed ,in which the neutral point of the generator is grounded through a blowout coil，and it is an important reason that the drift voltage of the neutral point will be amplified by the blowout coil. A preventive scheme was proposed, in which a resistor is connected in series with the blowout coil to restrain the amplifying effect of the drift voltage of the neutral point and to prevent the PT fuse blow; an electronic switch is connected in parallel with the resistor to control the resistor. Taking a hydropower plant as example, the effectiveness of this scheme was verified.

Key words: voltage transformer (PT), fuse blow, drift voltage of neutral point, damping resistor, electronic switch

豆占良;邹晖;于蒙. 发电厂电压互感器高压熔断器熔断原因分析[J]. 华电技术, 2012, 34(9): 23-26.

DOU Zhanliang;ZOU Hui;YU Meng. Analysis on reason of PT highvoltage fuse blow in a power plant[J]. Huadian Technology, 2012, 34(9): 23-26.

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