变压器低压侧故障远后备保护分析及解决方案  

Analysis of remote backup protection for transformer low-side fault and resolution

作　　者：潘书燕[1] 吕良君[1] 杨佳[2] 吴仕平[1] 

机构地区：[1]国电南瑞科技股份有限公司,江苏南京210003 [2]国网电力科学研究院,江苏南京210003

出　　处：《电力自动化设备》2009年第2期101-105,共5页Electric Power Automation Equipment

摘　　要：对于线路-变压器接线形式的110 kV线路保护的远后备保护,保护的范围为变压器低压侧母线处故障情况下,须考虑到由于变压器的接线组别、变压器的阻抗值等情况对线路保护元件的影响。针对变压器低压侧母线处故障时进行了详细的分析,根据故障时的正、负序电压和电流等分析,采用了不反应负荷阻抗、三相短路、系统振荡的多相补偿阻抗继电器和仅反应三相短路的上抛圆特性阻抗继电器相结合的解决方案,并进行了完整的变压器远后备保护方案的分析和Hypersim验证,不论从软件算法上、可靠性上都给予肯定,而且整定简单,便于现场运行实施。The influences of line-transformer connection mode and transformer impedance on the remote back-up protection of 110 kV transmission line should be considered when the protective area covers the faults of transformer low-side bus, for which the detailed analysis is proposed. Based on the analysis of positive and negative sequence voltage and current under fault, a scheme that integrates the multi-phase compensation impedance relay, which is immune to load impedance, three-phase fault and system swing, and the up-parabolic circular characteristic relay, which responses only to three-phase fault, is presented. The complete resolution of remote backup of transformer protection is analyzed and verified by Hypersim. Both the software algorithm and the reliability are confirmed. Its simple setting brings convenience to site ooeration.

关 键 词：多相补偿阻抗继电器 上抛圆特性阻抗继电器 变压器 远后备保护 线路保护 

分 类 号：TM773[电气工程—电力系统及自动化]