实用晶闸管状态辨识软硬件设计

Pratical Status Identification software and Hardware Design Scheme of Thyristors in High Voltage Environment

针对应用于高压领域的半控型器件晶闸管容易出现短路故障的情况,根据晶闸管短路故障的特征提出了一种新型、实用的适用于高压环境的晶闸管模块击穿状态辨识原理及软硬件设计方案。本方案用光纤取得信号,隔离高压,用施密特触发器对信号处理,用单片机对晶闸管进行状态识别。文中分析了对信号的识别方法和抗干扰原理。该原理安全,有效,易于实现。对于保护半控型器件晶闸管及保障电力系统的安全运行具有重要的意义,这种原理和实现方案具有良好的灵活性和广泛的应用性。

Thyristors used in high voltage environment is liable to the short circuit fault. This paper present a novel principle and a practical software and hardware design scheme for status i dentification of high voltage thyristors according to the short circuit fault feature of the thyristor This scheme uses optical cable to transmit signals and isolate high voltage, Schmitt trigger to dispose of signals, and microprocessor to identify the status of thyristor. The paper analyses the identifying method and the anti-interference principle. The principle can effectively identify the status of thyristors important for the safe operation of the device containing thyristors and the power system. The scheme is flexible and can be extended to other power electronic devices.