可控避雷器的触发型间隙方案研究  

Research on Trigger Gap Scheme of Controllable Surge Arrester

作　　者：余辉 李国富 刘赫 董勤晓 李志远 李会兵 YU Hui;LI Guofu;LIU He;DONG Qinxiao;LI Zhiyuan;LI Huibing(China Electric Power Research Institute,Beijing 100192,China)

机构地区：[1]中国电力科学研究院有限公司,北京100192

出　　处：《高电压技术》2021年第8期2791-2798,共8页High Voltage Engineering

基　　金：中国电力科学研究院创新基金(GY83-19-002)。

摘　　要：可控避雷器技术可以深度限制电力系统操作过电压,而该技术实用化的关键是其控制元件的简单可靠。为此提出一种新的触发型间隙作为控制元件,该间隙无需外部触发信号和能量,仅利用避雷器自身动作电流实现触发导通。以限制特高压交流合空线过电压为典型应用,可控比取10%,首先确定间隙参数并建立间隙模型,通过仿真分析研究间隙方案的限压效果及触发特性,然后提出间隙结构并设计原理样机,通过样机试验验证间隙触发功能及模型的正确性,最后综合仿真和试验结果,确定间隙方案可行性。研究结果表明:提出的触发型间隙能够在0.87倍额定电压下可靠触发导通,典型触发时延为33~333μs,且过电压波前越陡时延越短。间隙特性满足应用要求,该间隙方案用于可控避雷器具有技术可行性。The technology of controllable surge arrester can be used to limit switching overvoltage deeply in power system,and the key to the practicality of this technology is the simplicity and reliability of its control elements.In this paper,a new trigger gap is proposed as a control element.The gap does not need external trigger signal and energy,only uses the operating current of the arrester to realize trigger conduction.The close operation of unloaded UHV AC line is taken as typical application,and the control ratio is set at 10%.Firstly,the gap parameters are determined,the gap model is established,and the voltage limiting effect and trigger characteristics of the gap are studied through simulation analysis.Then,the gap structure is proposed,the principle prototype is designed,and the gap trigger function and correctness of the model are verified through prototype test.Finally,the feasibility of gap scheme is determined based on the simulation and test results.The results show that the trigger gap proposed in this paper can trigger reliably at 0.87 times of the rated voltage.The typical trigger delay is 33~333μs,and is shorter with steeper wavefront of overvoltage.The gap characteristics meet the application requirements,and it is technically feasible to construct controllable surge arrester with this trigger gap.

关 键 词：可控避雷器 动作电流 触发型间隙 触发特性 样机试验 

分 类 号：TM862[电气工程—高电压与绝缘技术]