摘要
传统的母线保护通过接入支路隔离刀闸的单位置接点实现母线运行方式判别,该方法在母线倒闸操作过程中存在人工操作的不确定性和保护失去选择性等风险。为此,提出了一种基于刀闸双位置记忆确认和虚拟差动电流综合比较的自适应母线差动保护方案。首先根据刀闸的单位置接点计算差动电流,其次根据刀闸的双位置接点对两段小差进行平衡校验,并和虚拟差流对照表进行比对分析,从而实现对母线运行方式的判别。此外,开发了一款和自适应母线差动保护适配的母线模拟盘。试点工程的实施和运行结果表明,该方案提高了母线保护对运行方式的识别能力,从而提高了变电站自适应倒闸的安全性和可靠性。
The traditional busbar protection realizes busbar operation mode identification by connecting to a single-position contact of a branch switch.This method has risks such as the uncertainty of manual operation and the loss of protection selectivity during the busbar switching operation process.To this end,the paper proposes an adaptive busbar differential protection scheme based on dual-position memory confirmation of knife switches and comprehensive comparison of virtual differential currents.First,the differential current is calculated based on the single-position contact points of the knife switch.Then,the balance tests and checks are conducted on the two-section small differential current according to the double-position contact points of the knife switch,and comparative analyses are carried out on the virtual differential current comparison table,so as to realize the discrimination of the busbar operation mode.In addition,is developed a busbar simulation panel compatible with adaptive busbar differential protection.The implementation and operation results of the pilot project show that the scheme enhances the busbar protection's ability to identify the operating mode,thereby improving the safety and reliability of adaptive switching in substations.
作者
姬生飞
朱玺文
王俊杰
JI Shengfei;ZHU Xiwen;WANG Junjie(NR Electric Co.,Ltd.,Nanjing Jiangsu 211102,China)
出处
《湖北电力》
2025年第2期71-77,共7页
Hubei Electric Power
基金
国家电网重点研发计划(项目编号:5100-202427024A-1-1-ZN)。
关键词
母线保护
隔离刀闸
电力系统
差动电流
刀闸位置校正
变电站
区域电网
busbar protection
disconnector
electric power system
differential current
position correction of the knife switch
substation
regional power grid
