天广直流工程换流阀异常导通原因分析及对策

发布时间：2018-03-14 15:48

本文选题：电触发换流阀　切入点：异常导通　出处：《高电压技术》2017年07期 　论文类型：期刊论文

【摘要】：针对2014年7月以来天广直流工程相继发生的4起换流阀异常导通事件,首先通过研究电触发换流阀晶闸管电子板(TE板)工作原理,搭建TE板电路仿真模型进行仿真分析,然后在南方电网公司直流输电设备状态评估与故障诊断重点实验室搭建TE板加压试验平台,开展了正常情况以及高湿度环境下的TE板加压试验。结果表明,电触发换流阀TE板长时间运行后表面积污严重,在高湿度运行工况下造成其后备触发功能门槛值大大降低,导致在换流变正常充电过程中换流阀异常导通。提出的定期清洗换流阀TE板和控制好阀厅湿度等反事故措施已在天广直流成功应用,彻底解决了电触发换流变充电过程中出现的换流阀误导通问题。
[Abstract]:In view of the four abnormal conduction events of converter valve in Tianguang DC Project since July 2014, first of all, by studying the working principle of electric trigger converter valve thyristor electronic plate (te), the simulation model of te circuit is built for simulation and analysis. Then the te plate pressurization test platform is built in the key laboratory of DC transmission equipment status evaluation and fault diagnosis of Southern Power Grid Corporation, and the te plate pressurization test is carried out under normal and high humidity conditions. The results show that, The surface area of the te plate of the electrically triggered commutation valve is serious after long time operation, and the threshold of the back-up trigger function is greatly reduced under the condition of high humidity operation. The proposed anti-accident measures such as regular cleaning of the te plate of the converter valve and control of the humidity of the valve hall have been successfully applied in Tianguang DC. The problem of misguided flow valve in the process of electrically triggered rheological charging is solved thoroughly.
【作者单位】：中国南方电网超高压输电公司检修试验中心;
【基金】：中国南方电网公司科技项目(012000KK52150018)~~
【分类号】：TM721.1

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