晶闸管型可控避雷器无源触发技术研究

Research on Passive Trigger Technology of Thyristor Controllable Arrester

晶闸管型可控避雷器可自适应深度抑制特高压系统操作和雷电过电压水平,对于降低系统关键设备绝缘造价具有重要作用。晶闸管阀开关需集成于瓷套内部,而瓷套内径及供电绝缘距离的限制使得晶闸管传统的光电触发方式不再适用。因此,研发适用于该工况的触发电路是可控避雷器功能实现的关键。在此基于击穿二极管(BOD)器件特性设计了一种体积紧凑、经济性高的无源双向触发电路,生产实物后开展了雷电、操作暂态冲击验证试验。试验结果表明,潜在因素对触发电路响应特性的影响可忽略不计,触发电路能够在阈值下可靠导通,且实物满足瓷套内径体积限制,该触发电路适用于可控避雷器。

Operating and lightning overvoltage in ultra high voltage system can be deeply suppressed by thyristor controllable arrester,which means that the cost of insulation for key equipment in the system can be greatly reduced.There are many limitations,such as the inner diameter of the ceramic sleeve and the insulation distance of the power supply,because the thyristor switches need to be integrated in the inner of the ceramic sleeve which leads to the traditional thyristor photoelectric trigger mode is not applicable for thyristor controllable arrester.Therefore.the key to realize the function of controllable arrester is to develop a trigger circuit suitable for this condition.Based on the characteristics of breakover diode(BOD)device,a compact and economical passive bi-directional trigger circuit is designed.After the circuit board is produced,lightning and operational shock transient tests are carried out to verify the performance of drive board.The experimental results show that the potential factors have negligible effects on the performance of the trigger circuit.The trigger circuit can be reliably turned on under the threshold,and the circuit board can meet the volume limitation of the inner diameter of the ceramic sleeve.Therefore,the trigger circuit is suitable for thyristor controllable arrester.