电力系统保护与控制2026，Vol.54Issue(6)：83-93,11.DOI:10.19783/j.cnki.pspc.250655
T接暂态电流对有源配电网差动保护的影响与解决方法
Impact of T-connected transient currents on current differential protection in active distribution networks and its mitigation method
摘要
Abstract
To address protection issues arising from distributed generation integration,current differential protection has been increasingly applied in active distribution networks.In distribution feeder sections,T-connected load branches,such as transformers or induction motors,are commonly present.The non-fault transient currents generated by these branches may lead to the maloperation of current differential protection.Focusing on this problem,this paper analyzes multiple scenarios where T-connected transient currents may cause differential protection maloperation.Based on the characteristics of transient current waveforms,a blocking scheme based on the attenuation characteristics of the positive-sequence component of the differential current is proposed.This scheme employs the Fourier algorithm to extract the fundamental current amplitude and distinguishes fault differential currents from non-fault transient differential currents according to the attenuation rate of the positive-sequence current amplitude.Simulation results and field data verification demonstrate that the proposed scheme can effectively avoid the risk of protection maloperation caused by T-connected transformers or induction motors without compromising the sensitivity of current differential protection.关键词
T接负荷分支/暂态电流/闭锁方案/电流差动保护/有源配电网Key words
T-connected load branch/transient current/blocking scheme/current differential protection/active distribution network引用本文复制引用
林浩然,孔维娜,褚福亮,袁通,杨明耀,高厚磊..T接暂态电流对有源配电网差动保护的影响与解决方法[J].电力系统保护与控制,2026,54(6):83-93,11.基金项目
This work is supported by the National Natural Science Foundation of China(No.52277109). 国家自然科学基金项目资助(52277109) （No.52277109）
