真空直流强迫过零开断过充特性  

Overcharge Characteristics in Vacuum DC Forced Current-zero Interruption

作　　者：秦涛涛 张颖 董恩源[3] 邹积岩[3] QIN Taotao;ZHANG Ying;DONG Enyuan;ZOU Jiyan(National Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,China;College of Information Science and Technology,Nanjing Forestry University,Nanjing 210037,China;College of Electrical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]南京理工大学瞬态物理国家重点实验室,南京210094 [2]南京林业大学信息科学技术学院,南京210037 [3]大连理工大学电气工程学院,大连116024

出　　处：《高电压技术》2020年第8期2663-2669,共7页High Voltage Engineering

基　　金：国家自然科学基金(51707094,51337001);中央高校基本科研业务费专项资金(30917011342,CX2018021).

摘　　要：为研究过充对真空直流强迫过零开断的影响,基于永磁–斥力混合式快速机构和转移强迫过零开断方法,在合成回路试验系统中进行了真空小电流直流开断试验。通过搭建隔离式弧后电流测量装置及介质恢复强度测量装置,研究了过充条件下的截流电流、弧后电流及弧后介质恢复强度,得到了过充电压与前述3者之间的影响关系。研究结果表明:截流电流、弧后电流以及弧后介质恢复强度均随过充电压增大,换流频率对截流值和弧后电流的影响大于过充电压的影响,起主导作用。过充电压达到一定值后,出现第一过零点开断失败现象,在该文试验条件下,过充电压应控制在可开断成功的临界换流电容电压的4倍以内。In order to investigate the influence of the overcharge on the vacuum direct current(DC)forced current-zero interruption,based on the permanent-repulsion high speed hybrid actuator and forced current-zero interruption method,a series of DC interrupting experiments were carried out in a synthetic test circuit.With the established devices for the measurement of post arc current and dielectric recovery strength,chopping current,post arc current and dielectric recovery strength were investigated under the condition of overcharge,and the relationships among the three parameters and overcharge were obtained.The results indicate that the chopping current,post arc current and dielectric recovery strength all increase with the overcharge voltage.The influence of the commutation frequency on the chopping current and post arc current is dominant,which is superior to the influence of the overcharge voltage.In addition,the interruption fails at the first current zero,when the overcharge voltage exceeds a certain value.Under the conditions in this paper,the overcharge voltage of the commutation capacitor should be controlled within four times of the critical commutation capacitor voltage that can enable the interruption successfully.

关 键 词：直流强迫过零开断 过充 弧后电流 截流 介质强度恢复 

分 类 号：TM721.1[电气工程—电力系统及自动化]