VFTO Generated in the Same Frequency and Phase Test of GIS and Corresponding Safety Measures

NI Hui; TIAN Lu; MA Feiyue; MA Yunlong; NIU Bo; WEI Ying; CHEN Lei

doi:10.13296/j.1001-1609.hva.2021.06.016

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VFTO Generated in the Same Frequency and Phase Test of GIS and Corresponding Safety Measures

更新时间：2025-04-26

- VFTO Generated in the Same Frequency and Phase Test of GIS and Corresponding Safety Measures
- High VoltageApparatus Vol. 57, Issue 6, Pages: 115-122+131(2021)
- 作者机构：
  
  国网宁夏电力有限公司电力科学研究院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2021.06.016
  CLC： TM595
- Published：2021
- 稿件说明：
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NI Hui, TIAN Lu, MA Feiyue, et al. VFTO Generated in the Same Frequency and Phase Test of GIS and Corresponding Safety Measures[J]. High voltageapparatus, 2021, 57(6): 115-122+131.
DOI：

NI Hui, TIAN Lu, MA Feiyue, et al. VFTO Generated in the Same Frequency and Phase Test of GIS and Corresponding Safety Measures[J]. High voltageapparatus, 2021, 57(6): 115-122+131. DOI： 10.13296/j.1001-1609.hva.2021.06.016.

摘要

GIS的同频同相耐压试验已经在变电站扩建的交接试验中得到应用

然而在试验过程中可能会发生击穿事故

产生的特快速瞬态过电压将严重威胁被试设备和运行设备的安全。文中针对某次363 kV GIS同频同相耐压试验

建立EMTP仿真模型并确定参数

研究不同工况和不同的运行方式下GIS内部可能会产生的特快速瞬态过电压

同时分析了试验保护电阻对特快速瞬态过电压的抑制作用

并给出相应的试验安全策略。结果表明

被试GIS系统不同的运行方式将产生不同的特快速瞬态过电压;当从单断口击穿转变为接地闪络后

非被试母线的设备节点过电压幅值将增高

断口的过电流也随之增加;常规试验保护电阻无法对特快速瞬态过电压起抑制作用;为保障试验设备与人员安全

试验状态感知措施及其他安全措施需在同频同相耐压试验中得到实施。

Abstract

The same frequency and phase withstand voltage test of GIS has been applied in the commissioning test of substation expansion. However

the breakdown accident may occur during the test and the VFTO generated will seriously threaten the safety of the equipment under test and in operation. In this paper

in view of same frequency and phase withstand voltage test of 363 kV GIS

the EMTP simulation model is set up and parameters are determined.The VFTO possibly generated inside the GIS at different conditions and different operation modes is studied and

at the same time

the suppression effect of the test protection resistance on VFTO is analyzed and corresponding test safety strategies are given. It is shown by the result that different operation modes of the tested GIS system will produce different VFTO. After changing from single break breakdown into ground flashover

the over-voltage amplitude of the non-tested bus node will be increased and the over-current of the break will also be increased accordingly. The conventional test protection resistance has no way to suppress the VFTO. For the assurance of safety for both equipment and personnel

the test state sensing and other safety measures are implemented in the same frequency and phase withstand voltage test.

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