高压直流输电工程电触发换流阀TE板烧毁机理研究

高压直流换流阀晶闸管电子板(ThyristorElectronicsBoard,TE板)是高压直流输电工程换流阀中重要的设备,如在运维过程中出现TE板烧毁,将导致换流阀极停运,严重影响直流工程的安全运行。针对天广直流TE板电阻器烧毁进行分析,首先对TE板进行外观检查和电性能检测,采用X射线、扫描声学显微镜等方法确认元器件内部电路受损范围,确认各受损元器件所属TE板功能模块,分析TE板故障元器件烧毁原因,探讨了TE板烧毁机理,并通过实验对TE板烧毁故障过程进行重现,验证分析结论,最终得出TE板烧毁原因,该分析方法对高压直流输电工程类似板卡故障原因分析具有重要参考意义。

Study on Burnout Mechanism of TE Board for HVDC Transmission Project Electric Triggered Converter Valve

Thyristor electronic board (TE board) of HVDC converter valve is an important equipment of HVDC converter valve. In the process of operation and maintenance, TE board burned out many times, resulting in the shutdown of the converter valve pole, which affects the safe operation of HVDC project seriously. This paper studies the TE board resistor burnout event in Tian-Guang HVDC project. Firstly, the appearance and electrical performance of TE plate are inspected. The damaged area of internal circuit of components is confirmed by X-ray detection and scanning acoustic microscopy, and the function modules of TE board which belong to each damaged component are also confirmed. Then, the burning reason of TE board faulty components is analyzed by circuit principle method, and the burning mechanism of TE board is speculated. The process of TE board burning failure is reproduced through experiments to verify the assumed mechanism for TE board burnout. Finally, the cause of TE board burning is obtained. The analysis method has reference significance for the analysis of similar board failure in HVDC project.