摘要
箱式变电站在电力系统中应用广泛,但其低压侧却易发生短路故障。现有线路保护方案存在固定阈值拒动或误动、动作时间不合理、抗干扰能力弱等问题。文章研究箱式变电站低压侧短路故障线路保护策略,构建基于故障电流分级的保护阈值动态调整机制,结合箱变结构设计快速跳闸逻辑,建立抗干扰型故障识别与保护动作协同机制,同时明确保护装置参数匹配性设置及定期校验维护要点,提升低压侧短路故障保护的可靠性与精准性。
Box-type substations are widely used in power systems,but short-circuit faults frequently occur on the low-voltage side.Existing line protection schemes suffer from issues such as fixed threshold misoperation or failure,unreasonable operation time,and weak anti-interference capability.This paper investigates the line protection strategy for low-voltage side short-circuit faults in box-type substations,establishes a dynamic adjustment mechanism for protection thresholds based on fault current grading,combines the structural design of box-type substations to develop a rapid tripping logic,and creates a coordinated mechanism for anti-interference fault identification and protection operation.Additionally,it specifies the parameter matching settings and regular calibration maintenance requirements for protection devices,thereby enhancing the reliability and accuracy of low-voltage side short-circuit fault protection.
作者
曾彪
郑光华
沈鸿伟
ZENG Biao;ZHENG Guanghua;SHEN Hongwei
出处
《电力系统装备》
2025年第12期134-136,共3页
Electric Power System Equipment
关键词
箱式变电站
低压侧短路故障
线路保护策略
动态阈值调整
抗干扰识别
boxtype substation
low-voltage side shortcircuit fault
line protection strategy
dynamic threshold adjustment
anti-interference identifi cation
