摘要
本文分析了一起220千伏变电站母联开关A相分闸异常事件。现场检查发现,一次设备外观未见明显异常,对A相机构机械间隙数据进行测量,发现机构内分闸电磁铁铁芯与分闸锁栓间隙异常,撬动分闸锁栓,开关无法分闸,因而判定实际分闸锁栓已脱扣,随后现场检修人员手动撬动开关合闸保持机构的合闸保持掣子后,A相分闸。进一步调查分析得知该母联开关长期未动作,导致合闸保持掣子与轴销间灰尘油泥积累较多,产生一定的黏连,且合闸保持掣子挂住轴销轴承为不带护套的滚针轴承,内曲面光滑度较差,增加机构部件间的阻力,使得合闸保持掣子无法正确向右转动,从而导致A相分闸异常。该事件提醒我们需重视电力设备的质量问题,尽量采用成熟的开关分合闸机构设计,对设备厂家的安装质量管控、工艺要求等是否达标在验收时应做到严谨、细致,并定期对设备开展巡视检查,定期开展倒闸合闸操作并做好记录,对设备的状况有个清晰的了解,避免此类事件发生。
In this paper,an abnormal event of A phase opening of the bus tie breaker of a 220kV substation has been analyzed.The on-site inspection found that there was no obvious abnormality in the appearance of the primary equipment.The mechanical gap data of the A-phase mechanism was measured.It was found that the gap between the opening electromagnet core and the opening lock bolt in the mechanism was abnormal.The opening lock bolt was pried and the switch could not be opened Therefore,it is determined that the actual opening lock bolt has been tripped.After the on-site maintenance personnel manually pry the closing and holding latch of the switch closing and holding mechanism,the A phase is opened.Further investigation and analysis revealed that the bus tie switch has not been actuated for a long time,resulting in the accumulation of dust and oil between the closing and holding latch and the shaft pin,resulting in a certain degree of adhesion,and the closing holding latch is hung on the shaft pin bearing without protection.The inner surface of the needle roller bearing is poor in smoothness,which increases the resistance between the parts of the mechanism,so that the closing and holding pawl cannot rotate to the right,resulting in abnormal opening of the A phase.This incident reminds us that we need to pay attention to the quality of power equipment,try to adopt mature switch opening and closing mechanism design,and check whether the equipment manufacturer’s installation quality control,process requirements,etc.meet the standards.Regularly conduct inspections of the equipment,regularly carry out the reverse closing operation and make a clear understanding of the status of the equipment,avoiding such events.
作者
徐昊翀
彭斌
周刚
揭业炜
白景涛
赖珊姗
周文超
XU Hao-chong;PENG Bin;ZHOU Gang;JIE Ye-wei;BAI Jing-tao;LAI Shan-shan;ZHOU Wen-chao(Jiaxing Power Supply Company,State Grid Zhejiang Electric Power Co.Ltd.,Jiaxing 314000,China)
出处
《电气开关》
2023年第2期105-108,116,共5页
Electric Switchgear
关键词
母联开关
分闸
合闸
异常
保持掣子
机构设计
bus tie switch
switch making
switch closing
abnormal situation
holding latch
mechanism design