Trip Analysis and Calculation on 10 kV Shunt Capacitor Bank

MAO Lei; LIU Xu; YAN Wei; ZHONG Yunhao; OU Jiajun

doi:10.14044/j.1674-1757.pcrpc.2018.02.010

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Trip Analysis and Calculation on 10 kV Shunt Capacitor Bank

更新时间：2024-09-14

- Trip Analysis and Calculation on 10 kV Shunt Capacitor Bank
- POWER CAPACITOR & REACTIVE POWER COMPENSATION Vol. 39, Issue 2, Pages: 49-53(2018)
- 作者机构：
  
  1. 广州供电局有限公司
  2. 国网襄阳供电公司
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2018.02.010
  CLC： TM53
- Published：2018，
- 稿件说明：
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[1]毛磊,刘旭,颜玮,钟昀昊,欧嘉俊.10 kV并联电容器组的跳闸分析与计算[J].电力电容器与无功补偿,2018,39(02):49-53+71.

MAO LEI, LIU XU, YAN WEI, et al. Trip Analysis and Calculation on 10 kV Shunt Capacitor Bank. [J]. Power capacitor & reactive power compensation, 2018, 39(2): 49-53.
[1]毛磊,刘旭,颜玮,钟昀昊,欧嘉俊.10 kV并联电容器组的跳闸分析与计算[J].电力电容器与无功补偿,2018,39(02):49-53+71. DOI： 10.14044/j.1674-1757.pcrpc.2018.02.010.

MAO LEI, LIU XU, YAN WEI, et al. Trip Analysis and Calculation on 10 kV Shunt Capacitor Bank. [J]. Power capacitor & reactive power compensation, 2018, 39(2): 49-53. DOI： 10.14044/j.1674-1757.pcrpc.2018.02.010.

摘要

某220 kV变电站10 kV侧并联电容器投切时

出现一合即跳故障。本文以该站10 kV双星形接线电容器组为例

对双Y形接线电容器组的不平衡电压、不平衡电流保护进行计算分析

结果表明不平衡电流对于电容单元内部故障的反映较不平衡电压保护更为灵敏

但随着单臂电容量的增加

保护灵敏度降低。通过对不同保护方式的理论计算

并利用ATP-EMTP软件对电容器组的暂稳态运行进行分析

发现电容器组的初始不平衡度对保护影响较大

即使电容偏差不超过2%

但受电源不对称度、合闸涌流等因素的共同作用

也可引起保护的跳闸

因此实际运行中应尽可能使电容器组电容平衡。

Abstract

A close（namely trip） fault is occurred in case switching of shunt capacitor at 10 kV side of certain 220 kV substation. In this paper

the 10 kV double star type capacitor bank is taken as an example to calculate and analyze unbalance voltage and unbalance current protection of double Y-shaped wiring. It is shown by the result that the unbalance current is more sensitive to the internal fault of the capacitor unit than that of unbalance voltage protection

but with the increase of single-arm capacitance

the protection sensitivity is reduced. The transient operation of the capacitor bank is analyzed by the theoretical calculation of different protection modes and with the use of ATP-EMTP software

finding that the initial unbalance of the capacitor unit has great influence on the protection. Although the capacitance deviation is no more than 2%

yet the protection trip can also be caused under the combined action power asymmetry and inrush current at closing etc. The capacitance of the capacitor bank shall be kept as balance as possible during the actual operation.

关键词

双星形不平衡电压不平衡电流ATP-EMTP电容器涌流

Keywords

double-star connectionunbalanced voltageunbalanced currentATP-EMTPcapacitorinrush current

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