Study of Potential Transformer Fault and Mitigation Measures in Power System with Non-direct Grounding Neutral Point

SHEN Wenwei; HE Feng; BAO Xin; BAI Fan; FANG Min; ZHU Hongyan; MENG Fanguo; ZHANG Guanjun; TIAN Yanshan

doi:10.13296/j.1001-1609.hva.2018.07.027

您当前的位置：

首页 >

文章列表页 >

Study of Potential Transformer Fault and Mitigation Measures in Power System with Non-direct Grounding Neutral Point

更新时间：2025-04-26

- Study of Potential Transformer Fault and Mitigation Measures in Power System with Non-direct Grounding Neutral Point
- High VoltageApparatus Vol. 54, Issue 7, Pages: 200-205(2018)
- 作者机构：
  
  1. 国网山东省电力公司济南供电公司
  2. 西安交通大学电力设备电气绝缘国家重点实验室
  3. 国家电网公司交流建设分公司
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2018.07.027
  CLC： TM451
- Published：2018
- 稿件说明：
移动端阅览
[1]申文伟,何峰,鲍新,白凡,房民,朱鸿燕,孟繁国,张冠军,田燕山.中性点非有效接地系统电压互感器故障分析与治理措施研究[J].高压电器,2018,54(07):200-205.

SHEN Wenwei, HE Feng, BAO Xin, et al. Study of Potential Transformer Fault and Mitigation Measures in Power System with Non-direct Grounding Neutral Point[J]. High voltageapparatus, 2018, 54(7): 200-205.
[1]申文伟,何峰,鲍新,白凡,房民,朱鸿燕,孟繁国,张冠军,田燕山.中性点非有效接地系统电压互感器故障分析与治理措施研究[J].高压电器,2018,54(07):200-205. DOI： 10.13296/j.1001-1609.hva.2018.07.027.

SHEN Wenwei, HE Feng, BAO Xin, et al. Study of Potential Transformer Fault and Mitigation Measures in Power System with Non-direct Grounding Neutral Point[J]. High voltageapparatus, 2018, 54(7): 200-205. DOI： 10.13296/j.1001-1609.hva.2018.07.027.

摘要

目前10

5kV中性点非有效接地系统内电压互感器（PT）高压熔断器熔断、互感器烧毁等故障（统称PT故障）频发

严重威胁电力系统的安全运行。文中统计分析了电网系统内26起PT故障

探讨了PT故障的深层原因

并结合故障原因对现有的各类消谐方式进行了对比研究。研究发现

PT故障的本质原因是PT过励磁导致热损坏

具体可归为两类原因

88%的PT过励磁故障由间歇性弧光接地过电压引起

均发生在10kV中性点经消弧线圈接地系统;仅有12%由铁磁谐振过电压引起

均发生在35kV中性点不接地系统。笔者认为

抑制PT过励磁的关键是限制PT本身承载的弧光接地过电压和铁磁谐振过电压。然而

现有的消谐措施多侧重于消除铁磁谐振过电压

对弧光接地过电压的限制不够有效。基于上述分析

文中推荐一种新型热敏电阻限流消谐装置

兼有PT限流与消谐功能

具有优良的"自适应"特性

初步应用效果良好

能够有效防止PT故障发生

具有广阔的应用前景。

Abstract

The fusing of potential transformer（PT）fuse and the burning of PT（generally referred to as the PT fault）oc-cur multi-times in non-direct grounding neutral system

which is a serious threat to the safe operation of power sys-tem. In this paper

the causes of 26 PT faults in the grid system and the present protective measures are analyzed. It isfound that the fundamental cause of PT fault is PT over-excitation and over-heating damage

88% of which is caused byintermittent arc grounding overvoltage（in 10kV grounding neutral system via arc suppression coil）

and only 12% ofwhich is caused by ferro-resonance overvoltage（in 35kV non-grounding neutral system）. The key to inhibiting PT over-excitation is to limit the arc grounding overvoltage and ferro-resonance overvoltage. The present measures are merely fo-cused on eliminating the ferro-resonance overvoltage

while the limitation of the arc grounding overvoltage is not effec-tive. Therefore

a new type of thermistor device with both current limiting and resonance elimination functions is high-ly recommended. The technique employs both current limiting and resonance elimination functions

which shows ex-cellent adaptive feature and good effect of PT fault elimination and enjoys a promising prospect in application.

关键词

Keywords

references

Views

190

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

RESEARCH ON A FULL-RANGE CURRENT-LIMITING FUSE FOR PROTECTION OF POTENTIAL TRANSFORMER

Research on a Current Limiting Fuse for Protecting High Voltage Potential Transformers

Analysis of Structure and Technique for High Voltage SF6 Potential Transformer

Influence of CVT Primary-Side Isolator Operation on Over-Excitation Protection of Transformer

Analysis on an Abnormal Voltage Fault During Phase-checking Process of Pumped Storage Unit

Related Author

?WANG Xia yun 3

?WU Zeng xu 3

?YAN Huan ling 2

WANG Ji mei 1

WANG Xu-feng3

TIAN En-wen2

WANG Ji-mei1

LIU Wei-hong

Related Institution

浙江杭州310021

陕西西安710077

杭州博达电器有限公司陕西西安710049

Hangzhou Boda Electric Co., Ltd.

2.Xi’an High Voltage Apparatus Research Institute

⁰