20231期特高压变电站站用低压交流断路器灵敏度分析袁梦雅,王刚,王秋源(中国电力工程顾问集团中南电力设计院有限公司,湖北武汉430071)摘要:变电站站用电系统中,供电回路断路器和电缆的确定需考虑负荷电流、热稳定、回路压降、末端短路时低压断路器灵敏度等。特高压变电站站区面积相较常规变电站更大,主变、高抗、大功率消防水泵等负荷设备的供电电缆较长,回路短路阻抗大,末端短路电流水平低,对馈线断路器的灵敏度校验造成一定影响。结合特高压变电站低压馈线断路器灵敏度校验实例,探讨各类负荷回路末端单相接地短路时灵敏度优化思路,并提出建议。关键词:特高压变电站;站用电;灵敏度校验;单相接地故障中图分类号:TM561DOI:10.19768/j.cnki.dgjs.2023.01.046SensitivityAnalysisofLow-voltageACCircuitBreakerforUHVSubstationYUANMengya,WANGGang,WANGQiuyuan(CentralSouthernChinaElectricPowerDesignInstituteofChinaPowerEngineeringConsultingGroupCorporation,Wuhan430071,China)Abstract:Inthepowersupplysystemofsubstationstation,thedeterminationofpowersupplycircuitcircuitbreakersandcablesneedstoconsiderloadcurrent,thermalstability,loopvoltagedrop,andlow-voltagecircuitbreakersensitivitywhentheendisshort-circuited.ThestationareaofUHVsubstationsislargerthanthatofconventionalsubstations.Thepowersupplycableofthemaintransformer,highresistance,high-powerfirepumpandotherloadequipmentislong,thecircuitshort-circuitimpedanceislarge...