用线路保护接地距离Ⅲ段作变压器相间故障的远后备──LFP-941保护装置动模试验验证

APPLYING LINE PROTECTION WITH GROUND DISTANCE STAGE Ⅲ TO REMOTE BACKUP PROTECTION FOR TRANSFORMER PHASE-PHASE FAULT ──Verified Through Test on Physical Model Using Protection LFP-941

按电力行业标准，１１０ｋＶ电网继电保护必须采用远后备原则。对两种接线方式的距离阻抗元件运行特性进行了详细分析，通过具体试验，验证了用１１０ｋＶ线路保护接地距离Ⅲ段适合作为本线路末端变压器相间故障的远后备。

According to electric power system standard, remote backup protection must be provided in 110 kV electric power networks. This paper discusses the operating behavior of impedance element connected in two different modes in detail. Through test on physical model, the result shows that 110 kV line protections are capable of being remote backup protection for transformers.