500kV自耦变压器分相差动保护低压绕组电流互感器接线研究  

Research on low-voltage winding current transformer wiring of phase differential protection in 500kV autotransformer

作　　者：于航 郑瑜 蒋炯锋 司徒伟业 王皓 YU Hang;ZHENG Yu;JIANG Jiongfeng;SITU Weiye;WANG Hao(Zhongshan Power Supply of Guangdong Power Grid Co.,Ltd,Zhongshan,Guangdong 528400;Foshan Power Supply of Guangdong Power Grid Co.,Ltd,Foshan,Guangdong 528000)

机构地区：[1]广东电网有限公司中山供电局,广东中山528400 [2]广东电网有限公司佛山供电局,广东佛山528000

出　　处：《电气技术》2023年第2期77-81,共5页Electrical Engineering

摘　　要：500kV自耦变压器分相差动保护在低压侧使用接线形式复杂的低压绕组电流互感器。本文首先给出了差动保护电流互感器减极性接线形式,在此基础上,着重分析低压绕组电流互感器接线原理和在不同安装位置的接线形式,防止验收人员按照减极性接线固有经验进行低压绕组电流互感器接线造成电流互感器极性接反。然后,通过某500kV主变带负荷测试案例详细说明低压绕组电流互感器极性接反后保护装置的实际运行状态和动作情况,以提高变电验收人员对低压绕组电流互感器极性验收问题的警惕性,为将来的变压器改造验收工作提供理论基础。Phase differential protection uses low-voltage winding current transformer at the low-voltage side in 500kV autotransformer. On the basis of describing the differential protection depolarity wiring for the autotransformer, this paper focuses on analyzing the wiring and polarity of low-voltage winding current transformer in the phase differential protection to solve the difficulties in the current transformer polarity acceptance of the autotransformer differential protection in actual work.Finally, through a load test case of 500kV autotransformer, the actual operating state and action of the protection devices are explained in detail where the polarity of the low-voltage winding current transformer is reversed.

关 键 词：自耦变压器 差动保护 分相差动保护 低压绕组电流互感器 减极性 

分 类 号：TM411.3[电气工程—电器] TM452