高压电器2024，Vol.60Issue(5)：220-228,9.DOI:10.13296/j.1001-1609.hva.2024.05.028
基于电容分布效应的一二次融合柱上断路器断口绝缘性能分析与优化研究
Insulation Performance Analysis and Optimization Research on the Across-open Contacts of Primary and Secondary Fusion Pole-mounted Circuit Breaker Based on Capacitance Distribution Effect
摘要
Abstract
In view of the problem of destructive discharge of pole-mounted circuit breaker due to excessive potential of enclosure to ground during the power frequency voltage test of the load side or power side of the existing primary and secondary fusion pole-mounted circuit breaker with EVT(electronic voltage transformer),the insulation perfor-mance across-open contacts of the pole-mounted circuit breaker with EVT configuration is studied int his paper.First-ly,capacitance distribution theoretical analysis of the enclosure to ground discharge problem during the withstanding voltage test across open contacts of the pole-mounted circuit breaker is performed,and the voltage between the enclo-sure and ground during the withstanding voltage test across open contacts of pole-mounted circuit breaker made of EVT with different capacitance values is given.Secondly,the theoretical design basis for the existing China national grid standardization scheme on the primary and secondary fusion pole-mounted circuit breaker is given and the insu-lation design margin of the primary and secondary fusion pole-mounted circuit breaker equipped with EVT on the power side is pointed out.It is concluded that under the premise of meeting the requirements of switching perfor-mance and EVT accuracy,the capacitor with low capacitance value is used as much as possible for the HV arm of EVT so to reduce the the voltage of enclosure to the ground.Finally,a new structure of the primary and secondary fu-sion pole-mounted circuit breaker with EVT on both the load side and the power side is proposed under the existing test method,and the test results are given.The analysis and test results prove that in case of withstanding voltage test across the open contacts of the pole-mounted circuit breaker with the structure,the voltage of the enclosure to ground is less than 42 kV(phase to ground voltage)specified by GB/T 11022-2020,which avoids the phenomenon of the enclosure to ground breakdown during the withstanding voltage test across open contacts and the results have been widely used in engineering.关键词
电容分布/柱上断路器/断口绝缘Key words
capacitance distribution/pole-mounted circuit breaker/insulation across open contacts引用本文复制引用
李龙江,白杨,张文凯,张艳晓..基于电容分布效应的一二次融合柱上断路器断口绝缘性能分析与优化研究[J].高压电器,2024,60(5):220-228,9.基金项目
国家电网有限公司科技项目(521997220031). Project Supported by Science and Technology Projcet of SGCC(521997220031). （521997220031）
