高压电器2017，Vol.53Issue(5)：193-199,7.DOI:10.13296/j.1001-1609.hva.2017.05.031
GIS现场验收及运行中若干问题的研究
Some Problems Research of GIS On-site Acceptance and in Operation
张书琴 1张克选 1高延峰 1陈瑞旭1
作者信息
- 1. 河南平芝高压开关有限公司,河南平顶山467013
- 折叠
摘要
Abstract
Due to a series of advantages of GIS,it is widely used in various voltage levels.In this paper,the simulative calculation and graphic analysis of the test waveforms obtained from the GIS field impulse insulation test is conducted firstly,which illustrates that the impulse test waveform is closely related to the GIS pipe-bus bar length.The test area should be simulated before field impulse test and the appropriate impulse test wave type is selected according to the results of simulation calculation.Secondly,the ferromagnetic resonance phenomena of electromagnetic voltage transformer(PT)are analyzed in site charging test.It is considered that the breaker's inter electrode capacitance,too short bus connection to PT and the phase angle when the circuit breaker cutting off the PT are the main reason that cause PT core magnetic saturation and result in PT ferro-resonance.Thirdly,the different action times of the three-phase lightning arrester(LA)at the same position in GIS operation are analyzed.It is considered that the main reason is due to the phase angle difference 120° in three phase power system,which results in that the three phase switching overvoltage peaks are different at the breaker switching instant.And the impulse currents of three phase LAs installed in the same place are different.Finally,the stream shape creepage trace occurred on the insulator surface are explained.It is considered that arises from the breaker's inter electrode capacitance and/or induction of adjacent transmission lines to no-load lines and results in the induced current flowing continuously on the insulator surface corroded by the arc decomposition,such current value is not high but the duration is longer.Through these problems research in GIS site acceptance and operation,it may provide theoretical basis with reference value and practical evidence for the safe operation of GIS.关键词
冲击绝缘试验/充电试验/铁磁谐振/操作过电压/断口电容/感应电流/爬电痕迹Key words
impulse insulation test/charging test/ferromagnetic resonance/switching overvoltage/capacitance across breaker/induced current/creepage trace引用本文复制引用
张书琴,张克选,高延峰,陈瑞旭..GIS现场验收及运行中若干问题的研究[J].高压电器,2017,53(5):193-199,7.
