Research and Design on 12 kV Outgoing Switchgear Considering Live Maintenance Function

ZENG Guowei; WANG Wei; SU Chao; HUANG Shihua; WANG Wenbo; MA Wenyu

doi:10.13296/j.1001-1609.hva.2021.09.022

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Research and Design on 12 kV Outgoing Switchgear Considering Live Maintenance Function

更新时间：2025-04-26

- Research and Design on 12 kV Outgoing Switchgear Considering Live Maintenance Function
- High VoltageApparatus Vol. 57, Issue 9, Pages: 161-173(2021)
- 作者机构：
  
  广东电网清远供电局
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2021.09.022
  CLC： TM591
- Published：2021
- 稿件说明：
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ZENG Guowei, WANG Wei, SU Chao, et al. Research and Design on 12 kV Outgoing Switchgear Considering Live Maintenance Function[J]. High voltageapparatus, 2021, 57(9): 161-173.
DOI：

ZENG Guowei, WANG Wei, SU Chao, et al. Research and Design on 12 kV Outgoing Switchgear Considering Live Maintenance Function[J]. High voltageapparatus, 2021, 57(9): 161-173. DOI： 10.13296/j.1001-1609.hva.2021.09.022.

摘要

为减少停电时间

提高供电可靠性

文中提出了一种12 kV出线开关柜带电检修设计方案。首先对开关柜的一次主接线进行了优化

提出在副柜的中部安装双动刀闸以实现检修不停电的目标。为评估额定电压下开关柜运行可靠性

建立了开关柜三维温度场和电场模型并进行了温度场与电场的仿真计算。建立三维瞬态电场模型分析了双动刀闸转换过程和雷电冲击下过电压对开关柜绝缘的影响。研究结果表明:额定电压下

主柜、副柜场强最大值分别为7.82×104、9.47×10

V/m

远小于空气击穿场强

绝缘状态良好;主柜、副柜温升最高值为50.7、42.8 K

符合设计标准。主柜、副柜在进行双动刀闸切换过程中产生的过电压峰值为16.6 kV

此时开关柜的电场强度最大值为4.35×10

V/m

绝缘表现良好;雷电冲击条件下

主柜、副柜内场强最大值分别为1.415×10

、5.093×10

V/m

此时避雷器的安装不能省略。

Abstract

In this paper

a kind of design scheme for the live maintenance of 12 kV outgoing switchgear is proposed in order to reduce the power off time and improve power supply reliability.Firstly

the primary wiring of the switchgear is optimized and the method of installing a double-action switch in the middle part of the standby switchgear is proposed to achieve the purpose of live maintenance.For assessing operation reliability of the switchgear at rated voltage

a 3D temperature field and electric field model of the switchgear are set up and the simulation calculation of

the temperature field and electric field is performed.A 3D transient electric field model is set up to analyze the influence of overvoltage on switchgear insulation at switching condition of the double-action switch and the lightning impulse condition respectively.The research results show that the maximum field strength of the main switchgear and the standby switchgear is 7.82×10

V/m and 9.47×10

V/m respectively

is less than the air breakdown field strength and the dielectric condition is good.The maximum temperature rise of the main switchgear and the standby switchgear is 50.7 K and 42.8 K and meets related standard requirements.The peak of overvoltage generated during the switching process of the main switchgear and standby switchgear is 16.6 kV.At this time

the maximum electric field strength of the switchgear is 4.35×10

V/m

which shows good dielectric performance.The maximum field strength in the main switchgear and standby switchgear at lightning impulse condition is 1.415×10

V/m and 5.093×10

V/m respectively.At this time

the installation of the lightning arrester cannot be omitted.

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