摘要详情

ID / 提交时间

130 / 2024-04-14 15:37:16

标题

DC Short-Circuit Current Transfer of Parallel Vacuum Switches with Different Intervals

关键字

vacuum switch,time intervals,DC circuit breaker

主题及专题

4)Semi-conductor switching technology (including HV DC)

状态

摘要录用

作者

Li Li / Guangdong Power Grid Corp Electric Power Research Institute, Electric Power Research Institute of Guangdong Power Grid Co. LTD

Mingzhen Yang / Guangdong Power Grid Corp Electric Power Research Institute, Electric Power Research Institute of Guangdong Power Grid Co. LTD

Shuxing Ma / State Key Laboratory of Electrical Insulation and Power Equipment, Department of Electrical Engineering, Xi’an Jiaotong University

Qi Zhang / State Key Laboratory of Electrical Insulation and Power Equipment, Department of Electrical Engineering, Xi’an Jiaotong University

Bin Xiang / State Key Laboratory of Electrical Insulation and Power Equipment, Department of Electrical Engineering, Xi’an Jiaotong University

zhiyuan liu / State Key Laboratory of Electrical Insulation and Power Equipment, Department of Electrical Engineering, Xi’an Jiaotong University

Yingsan Geng / State Key Laboratory of Electrical Insulation and Power Equipment, Department of Electrical Engineering, Xi’an Jiaotong University

Jianhua Wang / State Key Laboratory of Electrical Insulation and Power Equipment, Department of Electrical Engineering, Xi’an Jiaotong University

摘要

With the advancement of renewable energy source such as photovoltaic plant and wind farm, the capacity of DC grid is increasing rapidly. Larger grid capacity results in higher requirements of current load and interruption capacity in DC circuit breaker (DCCB). However, the capacity of single vacuum switch is limited to load several kiloampere system current. Parallel vacuum switches are needed to achieve higher load capacity. In this paper, to analyze the current transfer in parallel vacuum switches, a DC short-circuit experimental model is established with DCCB consisting of two parallel vacuum switches. The short-circuit current transfer between parallel vacuum switches and interruption characteristics of DCCB with different fault current and opening time intervals are investigated. From the experimental results, with the same opening time interval, higher short-circuit current results in longer current transfer time. With larger opening time interval, higher voltage in pre-charged capacitor is needed to interrupt the same fault current. In DC system with high load current, parallel vacuum switches can be used in DCCB with short opening time interval.