摘要
HGIS的隔离开关动触头与触指边缘长期接触、摩擦会产生积累异物,在电动力和气流等外力作用下运动至动端屏蔽表面,隔离开关分合闸操作过程中就会发生起跳或掉落,造成动、静端屏蔽对筒体发生SF6气隙放电。文章分析了750 kVHGIS卧式隔离开关触头异物放电故障现象,通过检查试验、取样分析、故障复现和仿真模拟,论证了故障原理和机理,并结合内部异物对触头周围电场的影响,从结构设计、组部件选型、装配操作、异物清洁、现场安装等方面提出改进措施,对HGIS设备选型、采购、制造、验收、安装及运检等环节全寿命周期管理具有重要借鉴和参考价值。
Prolonged contact and friction between the moving contact of the HGIS disconnector and the edge of the contact fingers can lead to the accumulation of foreign particles.Under the influence of external forces such as electromagnetic force and airflow,these contaminants may migrate to the surface of the moving-side shielding.During disconnector operation,either closing or opening,these particles jump or fall off,resulting in SF6 gas gap discharges between the shielding electrodes and the enclosure.This study investigates the foreign-particle-induced discharge phenomenon observed in the contacts of 750 kV horizontal-type HGIS disconnectors.Through inspection tests,sample analysis,fault replication,and simulation modeling,the underlying fault mechanisms are thoroughly examined and validated.By analyzing the impact of internal contaminants on the electric field distribution around the contacts,the paper proposes targeted improvements in structural design,component selection,assembly procedures,contamination removal strategies,and on-site installation practices.The findings provide critical guidance for the full life-cycle management of HGIS equipment,including specification,procurement,manufacturing,acceptance testing,installation,and operation and maintenance.Furthermore,this paper offers valuable insights for enhancing equipment reliability and minimizing failure risks.
作者
张宏伟
ZHANG Hongwei(Jinchang Power Supply Company of State Grid Gansu Electric Power Company,Gansu Jinchang 737100,China)
出处
《农村电气化》
2025年第6期48-55,共8页
Rural Electrification
作者简介
张宏伟(1976-),男,本科,教授级高级工程师、高级技师,研究方向为超特高压设备电磁特性与新能源并网特性研究,E-mail:gs_zhanghw@163.com。
