CAJ | 학술논문

针对事故潮流易造成线路传统距离保护 III 段误动的隐性故障问题，详细研究了过负荷和故障在Uφcosφφ和电压序分量相位等电气特征差异，提出了一种具有防过负荷误动的距离保护III段新方法。此方法包括两部分：基于Uφφcos（φφφ＋90°－φline ）＜0．5UNN的全相过负荷与相间故障识别方法；基于电流不对程度、···· ARG（ Uφ2／U 0）和ARG（ Uφ1／U 0）的非全相过负荷与单相接地故障识别方法。介绍了具有防止过负荷误动的距离保护III段实施方案，并通过了RTDS仿真试验验证。
침대사고조류역조성선로전통거리보호 III 단오동적은성고장문제，상세연구료과부하화고장재Uφcosφφ화전압서분량상위등전기특정차이，제출료일충구유방과부하오동적거리보호III단신방법。차방법포괄량부분：기우Uφφcos（φφφ＋90°－φline ）＜0．5UNN적전상과부하여상간고장식별방법；기우전류불대정도、···· ARG（ Uφ2／U 0）화ARG（ Uφ1／U 0）적비전상과부하여단상접지고장식별방법。개소료구유방지과부하오동적거리보호III단실시방안，병통과료RTDS방진시험험증。
In allusion to the problem of traditional zone III distance relays can′t identify the line overload and the line fault, this paper specifically analyses the electrical characteristics differences of the overload and the fault in Uφcosφφand the change of phase, then a new method of distance protection zone III preventing overload mal-operation is pro-posed.The method includes two parts:one of them is a method to distinguish phase-to-phase faults from symmetrical overload, which is based on Uφφcos(φφφ+90°-φline )<0.5UNN;the other of them is a method to distinguish single-phase earth fault from unsymmetrical overload, which is based on current asymmetry degree,ARG( U · ·φ2/U 0 ) and ARG · · (Uφ1/U 0 ) (φ=A,B,C) .The implementation scheme of distance protection zone III coping with overload mal-opera-tion is proposed.The method is effective through RTDS simulation verification.