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为满足晶闸管投切电容器(TSC)装置可靠性及其试验方法和试验等效机理研究的需要,重点研究了TSC装置的核心部件——高压晶闸管阀在过电流故障状态下的失效机理。首先介绍了TSC系统及其阀的结构以及过电流故障形成的原因和特征,并给出了过电流的数学方程和仿真波形。然后按照过电流故障的不同发展阶段对TSC阀的电流、电压和热等应力进行了解析分析。在上述基础上,结合器件的物理特性,对TSC阀各个元件在各种故障应力下的内部物理过程进行了分析。最终得到了TSC阀在过电流故障的不同发展阶段的失效模式和失效指标,从而揭示了TSC高压晶闸管阀的过电流失效机理。
In order to meet the needs of thyristor switching capacitor (TSC) device reliability and its test methods and experimental equivalent mechanism, the key component of TSC device, the failure mechanism of high-voltage thyristor valve in over-current fault state, is studied emphatically. Firstly, the structure of TSC system, its valve structure and the causes and characteristics of overcurrent fault are introduced. The mathematical equations and simulation waveforms of overcurrent are given. Then the current, voltage and thermal stress of TSC valve were analyzed according to different stages of overcurrent fault. On the basis of the above, combined with the physical characteristics of the device, the internal physical processes of various components of TSC valve under various fault stresses were analyzed. Finally, the failure mode and failure index of TSC valve in different stages of overcurrent fault were obtained, which revealed the overcurrent failure mechanism of TSC high voltage thyristor valve.