主动型过电压保护间隙场击穿触发回路的暂态特性研究

发布时间：2018-04-18 15:53

本文选题：主动触发 + 过电压保护间隙　；参考：《西安交通大学学报》2017年02期

【摘要】：针对主动型过电压保护间隙(SPG)研究中仅从触发回路的结构及材料角度难以分析其性能差异的机理,通过建立组合波注入下触发回路的等效模型,获得了触发回路输出电压的暂态解析式。基于触发回路的电压动作过程、触发电流与主间隙电流的数值关系、发生时序的理论分析及实验验证,得出了触发回路响应时间及保护间隙击穿电压的变化规律。研究发现:触发回路中耦合气体放电管动作滞后于压敏电阻,其动作时刻主间隙两端电压约为压敏电阻阈值电压U1mA与耦合气体放电管动作电压UGM之和;触发电流I1在时间上先于主间隙电流I2出现,但在数值上I1远小于I2;触发回路中耦合气体放电管及触发间隙的响应时间t1、t2随冲击电压峰值Um的增大而减小,与之对应的主动型SPG的响应时间t3及压比K远小于被动型SPG约2.224μs的响应时间及2.42的压比。该结果可为主动型过电压保护间隙触发特性的研究及优化提供理论与实验基础。
[Abstract]:In the study of active overvoltage protection gap (SPG), it is difficult to analyze the mechanism of performance difference only from the point of view of the structure and material of the trigger circuit. The equivalent model of the trigger circuit under the combined wave injection is established.The transient analytical formula of the output voltage of the trigger circuit is obtained.Based on the voltage action process of the trigger circuit, the numerical relationship between the trigger current and the main gap current, and the theoretical analysis and experimental verification of the sequence of occurrence, the response time of the trigger circuit and the breakdown voltage of the protection gap are obtained.It is found that the action of the coupled gas discharge tube in the trigger circuit lags behind the varistor, and the voltage at both ends of the main gap is about the sum of the threshold voltage U1mA of the varistor and the UGM of the action voltage of the coupled gas discharge tube.The trigger current I _ 1 appeared earlier than the main gap current I _ 2 in time, but numerically I _ 1 was much smaller than that of I _ 2. The response time t _ (1) t _ (2) of the coupled gas discharge tube and the trigger gap in the trigger circuit decreased with the increase of the impulse voltage peak value (Um).The response time t _ 3 and the pressure ratio K of the active SPG are much smaller than the response time of the passive SPG about 2.224 渭 s and the pressure ratio of 2.42.The results can provide a theoretical and experimental basis for the study and optimization of the gap trigger characteristics of active overvoltage protection.
【作者单位】：西安交通大学电力设备电气绝缘国家重点实验室;
【基金】：国家自然科学基金资助项目(51577151,51221005) 陕西省创新团队资助项目(2012KCT-07) 中央高校基本科研业务费专项资金资助项目(xkjc2014006)
【分类号】：TM862

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