电网技术Issue(9)：2570-2574,5.DOI:10.13335/j.1000-3673.pst.2014.09.040
252 kV GIS隔离开关特快速暂态过电压试验中触头间隙重复击穿过程研究
Research on Repeated Breakdown Process of Disconnector Contact Gap During Very Fast Transient Overvoltage Test of Overall Switching Process of Disconnector in 252 kV GIS
摘要
Abstract
To research the phenomena of repeated breakdown of contact gap of the disconnector in 252 kV gas insulted switchgear (GIS) thoroughly when the disconnector is used to switch on/off no-load short bus and to implement accurate simulation of very fast transient overvoltage (VFTO) during the whole switching process of the disconnector, a test platform for 252 kV GIS is constructed to perform experimental research on repeated breakdown process of the disconnector contact gap and its influencing factors. Through synchronously measuring the gap voltage and the length of contact clearance, the statistic relationship between the breakdown voltage of contact gap and the length of contact clearance during the switching on/off of the disconnector is obtained. Statistical results show that the relationship between contact gap breakdown voltages and the lengths of contact clearance during the switching on/off process basically agrees with the breakdown voltages of corresponding lengths under power frequency voltage, and there exists the polarity effect. The space charge produced by every time of gap discharge promotes the occurrence of follow-up breakdown, and the more violent the first time of discharge is, the more obvious this trend will be. The attenuation time constant of residual voltage at load side is about 160 min, so the attenuation of residual voltage in the intermittence between the repeated breakdowns can not be taken into account in the simulation. Under the same restoring voltage of the contact gap the residual voltage at the load side does not obviously influence the electric field distribution in the gap. Based on above-mentioned research results, a VFTO simulation model of the whole switching on/off process of the disconnector is built, and the simulation results basically coincide with the measured results.关键词
气体绝缘组合电器/特快速暂态过电压/隔离开关/重复击穿/空间电荷/残余电压Key words
gas insulated switchgear/very fast transient overvoltage/disconnector/repeated breakdown/space charge/residual voltage分类
信息技术与安全科学引用本文复制引用
詹花茂,姚林志,李志兵,段韶峰,李成榕,赵琳..252 kV GIS隔离开关特快速暂态过电压试验中触头间隙重复击穿过程研究[J].电网技术,2014,(9):2570-2574,5.基金项目
国家重点基础研究发展计划项目(973项目)(2011CB-209405)；国家电网公司科技项目(SGKJ[2010]151)。The National Basic Research Program of China (973 Program)(2011CB209405) （973项目）
Project Supported by Science and Technology Project of SGCC(SGKJ[2010]151) （SGKJ[2010]151）
