4.2MV冲击电压发生器触发脉冲耦合方式研究  

Research on Trigger Coupled Methods of 4.2MV Impulse Voltage Generator

作　　者：马钰峰 刘轩东[1] 刘现飞 Ma Yufeng;Liu Xuandong;Liu Xianfei(State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University,Xi’an 710049 China)

机构地区：[1]电力设备与电气绝缘国家重点实验室(西安交通大学),西安710049

出　　处：《电工技术学报》2022年第S01期288-296,共9页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划资助项目(2016YFB0900804)。

摘　　要：紧凑型封闭式的冲击电压发生器由于其自身固有电感小的特点,常用于大容量试品现场冲击试验,为了提高装置同步性能,需要在前级设置多路电脉冲触发开关。由于其级间耦合电容和开关杂散电容较大,多路开关同步触发就变得更加困难。在4.2MV封闭式冲击电压发生器中,通过外部触发器产生百千伏纳秒脉冲波形,并通过隔离元件施加至前三级开关触发电极。隔离元件既要保证纳秒级触发脉冲有效地传输至触发电极,又要隔离主回路放电。研究结果表明,千欧级的电阻可有效抑制装置同步时耦合在触发器上的电压幅值,但同时使得触发器输出电压幅值严重降低,前沿变慢;电感耦合方式使得触发电压在波前出现振荡,波形质量较差,且数微亨左右电感难以抑制同步时触发器侧耦合电压幅值;采用电容耦合方式既可以保证触发器输出电压的波形质量,又可以抑制触发器侧同步耦合电压。The compact impulse voltage generator is often used in the on-site impulse test of large-capacity electrical equipment due to its low inductance.In order to improve the synchronization performance of the device,it is necessary to set up multiple gas switches triggered by electrical pulse at the front stages.Due to the larger stray capacitance between the discharge stages,the triggering of multiple switches becomes more difficult.In 4.2MV impulse voltage generator,the external trigger system generates a hundred kilovolts nanoseconds pulse,which is applied to the trigger electrode of the first three-stage switch through isolation impedances.The isolation impedance should not only ensure that the nanosecond trigger pulse is effectively transmitted to the trigger electrode,but also isolate the overvoltage from main circuit discharge.The research results show that the resistance of kiloohms can effectively suppress the voltage coupled on the trigger system during synchronization,but reduce the amplitude of the trigger pulse seriously,and increase the wavefront time;the coupling inductance oscillates the pulse wavefront,and the inductance of microhenries cannot suppress the amplitude of the coupling voltage on the trigger system during synchronization;the capacitive coupled method can not only ensure the waveform quality of the trigger pulse,but also effectively reduce the synchronous coupling voltage on the trigger system.

关 键 词：冲击电压发生器 触发耦合方式 同步 隔离 

分 类 号：TM832[电气工程—高电压与绝缘技术]