高压电器2017，Vol.53Issue(3)：141-146,6.DOI:10.13296/j.1001-1609.hva.2017.03.022
新型直流真空断路器强迫换流分断特性
Forced Commutation Interruption Characteristic of Novel DC Vacuum Circuit Breaker
摘要
Abstract
The novel DC hybrid vacuum circuit breaker based on forced commutation principle is effective for fault protection in DC power system with small time factor.The realization of a rapid DC vacuum circuit breaker (VCB) depends on the knowledge of the high current interruption characteristics of a vacuum circuit breaker in the condition of short arcing duration and short gap.In this study,a synthetic test circuit was used to study the dielectric recovery of a VCB with CuCr50 butt contacts after interrupting 20 kA DC currents in the condition that the arcing time was hundreds of microseconds and the contact gap was not more than 2 mm.Experiment results showed that for interrupting the current of 17 kA with the decline rate of 110 Mμs,the VCB could still withstand electric field strength of 10 kV/mm after dielectric recovery time of 41 μs,but delayed dielectric breakdown happened at times.When the interrupted current increased to 21 kA,the broken-down electric field strength was below 5 kV/mm.The interruption performance of VCB can be improved by using new contact structure to get multiple-column arc ignited at the moment contacts opening.关键词
直流真空断路器/介质恢复/微粒Key words
DC vacuum circuit breaker/dielectric recovery/particles引用本文复制引用
张超,刘路辉,徐国顺,江壮贤..新型直流真空断路器强迫换流分断特性[J].高压电器,2017,53(3):141-146,6.基金项目
国家自然科学基金资助项目(51207166,51307179).Project Supported by National Natural Science Foundation of China (51207166,51307179). （51207166,51307179）
