Analysis of Potential Transformer Burning-out and Fuse’s Blowing in Local Power System

WU Wan-cai; WU Zhi-yong; BIAN Jiang; WANG Ya-fang

doi:10.13296/j.1001-1609.hva.2011.03.016

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Analysis of Potential Transformer Burning-out and Fuse’s Blowing in Local Power System

更新时间：2025-04-26

- Analysis of Potential Transformer Burning-out and Fuse’s Blowing in Local Power System
- High VoltageApparatus Vol. 47, Issue 3, Pages: 87-92(2011)
- 作者机构：
  
  宁夏电力公司吴忠供电局
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2011.03.016
  CLC： TM864
- Published：2011
- 稿件说明：
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[1]武万才,吴志勇,边疆,王亚芳.地区电网电磁式电压互感器烧损和高压熔丝熔断原因分析[J].高压电器,2011,47(03):87-92.

WU Wan-cai, WU Zhi-yong, BIAN Jiang, et al. Analysis of Potential Transformer Burning-out and Fuse’s Blowing in Local Power System[J]. High voltageapparatus, 2011, 47(3): 87-92.
[1]武万才,吴志勇,边疆,王亚芳.地区电网电磁式电压互感器烧损和高压熔丝熔断原因分析[J].高压电器,2011,47(03):87-92. DOI： 10.13296/j.1001-1609.hva.2011.03.016.

WU Wan-cai, WU Zhi-yong, BIAN Jiang, et al. Analysis of Potential Transformer Burning-out and Fuse’s Blowing in Local Power System[J]. High voltageapparatus, 2011, 47(3): 87-92. DOI： 10.13296/j.1001-1609.hva.2011.03.016.

摘要

中性点不接地系统中

由于电磁式电压互感器（PT）励磁电感的非线性特性

在一定条件下容易产生铁磁谐振过电压

引起PT内绝缘击穿、外绝缘放电及一次侧熔丝熔断

且常因事故处理不及时或事故扩大而造成大面积停电。笔者分析了地区电网中由10kV单相接地故障和35kV单相接地故障引起10kV侧电容传递过电压激发的两起铁磁谐振过电压事故原因

通过实例验证

提出了相应的消谐措施

以减少或避免此类事故的发生。

Abstract

In the power system without neutral grounding

due to the nonlinear characteristic of excitation inductance of three-phase electromagnetic potential transformer

the ferroresonance overvoltage is easy to occur under a certain condition

leading to breakdown of the inner insulation

discharge of the external insulation

and blowing of the fuse.This accident often results in outage in large area because of delay in dealing with.This paper analyzed two ferroresonance overvoltage accidents caused by 10 kV single-phase grounding and 35 kV single-phase grounding

which induced the capacitor at 10 kV side to transfer overvoltage.The causes of the accidents were found

and the prevention measures were suggested correspondingly.Examples support the measures.

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Related Institution

西安交通大学陕西西安710049

Xi’an Jiaotong University

西安交通大学电气工程学院陕西西安710049

School of Electrical Engineering,Xi’an Jiaotong University

武汉大学电气工程学院湖北武汉430072

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