Effect of Neutral Point Voltage Offset on Operating Opportunity of External Fuse and Protection Sequence of Capacitor Banks

ZHANG Peng; YANG Dong; YANG Tao; GAO Yuhan

doi:10.14044/j.1674-1757.pcrpc.2020.01.004

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Effect of Neutral Point Voltage Offset on Operating Opportunity of External Fuse and Protection Sequence of Capacitor Banks

更新时间：2024-09-14

- Effect of Neutral Point Voltage Offset on Operating Opportunity of External Fuse and Protection Sequence of Capacitor Banks
- POWER CAPACITOR & REACTIVE POWER COMPENSATION Vol. 41, Issue 1, Pages: 18-24(2020)
- 作者机构：
  
  1. 上海交通大学电气工程系
  2. 国网江苏省电力有限公司太仓市供电分公司
  3. 国网上海市电力公司奉贤供电公司
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2020.01.004
  CLC： TM53;TM563
- Published：2020，
- 稿件说明：
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[1]张鹏,杨栋,杨焘,高瑜焓.中性点电压偏移对外熔断器动作时机和电容器组保护顺序的影响[J].电力电容器与无功补偿,2020,41(01):18-24.

ZHANG PENG, YANG DONG, YANG TAO, et al. Effect of Neutral Point Voltage Offset on Operating Opportunity of External Fuse and Protection Sequence of Capacitor Banks. [J]. Power capacitor & reactive power compensation, 2020, 41(1): 18-24.
[1]张鹏,杨栋,杨焘,高瑜焓.中性点电压偏移对外熔断器动作时机和电容器组保护顺序的影响[J].电力电容器与无功补偿,2020,41(01):18-24. DOI： 10.14044/j.1674-1757.pcrpc.2020.01.004.

ZHANG PENG, YANG DONG, YANG TAO, et al. Effect of Neutral Point Voltage Offset on Operating Opportunity of External Fuse and Protection Sequence of Capacitor Banks. [J]. Power capacitor & reactive power compensation, 2020, 41(1): 18-24. DOI： 10.14044/j.1674-1757.pcrpc.2020.01.004.

摘要

针对10 kV并联电容器组故障后外熔断器动作次数远低于继电保护装置的运行现状

利用Matlab软件分析了太仓地区10 kV单星形并联电容器组不同程度故障时的过流系数及外熔断器动作表现

仿真结果表明

考虑故障后电容器组中性点电压偏移因素在单台电容器内部击穿1个串联段后

其过流值不足以达到外熔断器动作值

加之工程实践中的继电保护装置灵敏系数通常远高于规程要求

继电保护将成为事实上的"第一级保护"

外熔断器因其动作条件及误差特性

反而成为一种不可靠的"后备保护"。

Abstract

In view of the fact that the action times of external fuses of 10 kV shunt capacitor bank is much lower than that of relay protection devices

the over-current coefficient and the action performance of external fuse under different degrees of failures are analyzed by using Matlab software.It is shown by the simulation result that the over-currentof external fuse is not sufficient to meet the operating value after one internal segment of a capacitor breakdown

with the neutral point voltage offset factor taking into account.In addition

the sensitivity coefficient of the relay protection device in engineering practice is usually much higher than the regulation requirements.The relay protection will become in fact the the first stage protection.The external fusebecomes an unreliable backup protection due to its operating conditions and error characteristics.

关键词

外熔断器继电保护动作分区保护顺序

Keywords

external fuserelay protectionaction zonesprotection sequence

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