火电厂低压厂用电单相接地越级跳闸故障分析及治理  

Analysis and Management of Single-Phase Ground Crossing Trip Fault of Low-Voltage Plant Power in Thermal Power Plant

作　　者：王磊 Wang Lei(Datong Hudong Power Generation Company of State Power Grid,Datong Shanxi 037043,China)

机构地区：[1]国电电力大同湖东发电有限公司,山西大同037043

出　　处：《现代工业经济和信息化》2025年第2期270-271,276,共3页Modern Industrial Economy and Informationization

摘　　要：针对火电厂低压厂用电系统发生单相接地越级跳闸故障,采用剩余电流型单相短路保护方案来过滤不平衡电流,提高灵敏度。选择零序电流保护方案,避免发生拒动情况。通过使用防越级跳闸保护系统,保证了火电厂供电系统正常运行时间延长至17530 h,故障发生率≤1.35%,大范围降低了运营成本。For the occurrence of single-phase ground tripping fault in the low-voltage power system of thermal power plant,residual current type single-phase short-circuit protection scheme is adopted to filter the unbalanced current and improve the sensitivity.The zero sequence current protection scheme is selected to avoid the occurrence of refusal.By using the anti-step trip protection system,it ensures that the normal operation time of the power supply system of the thermal power plant is extended to 17,530 h,and the fault incidence rate is≤1.35%,which reduces the operation cost in a wide range.

关 键 词：单相接地 越级跳闸 经济性分析 

分 类 号：TM621[电气工程—电力系统及自动化]