CAJ | 학술논문

为提高母线保护的动作速度，根据行波传输理论，提出一种行波波形积分式快速母线保护方法。当母线故障时，在所有出线上检测到的初始行波均来自于线路的背后，是正向行波；而某条出线发生故障时，在所有非故障线路上检测到的初始行波是正向行波，而故障线路上检测到的初始行波是反向行波。在故障后特定时间内对各条出线上的方向行波进行积分运算，根据正反向行波积分值的比值大小识别故障方向。综合分析所有出线的故障方向，可识别母线是否发生故障。利用PSCAD/EMTDC 构建了500 kV 母线模型，仿真结果表明：所提方法鲁棒性强、动作快速、可靠性高，其性能基本不受故障电阻、故障初始角、开关操作等的影响，有望应用于实际的电力工程中。
위제고모선보호적동작속도，근거행파전수이론，제출일충행파파형적분식쾌속모선보호방법。당모선고장시，재소유출선상검측도적초시행파균래자우선로적배후，시정향행파；이모조출선발생고장시，재소유비고장선로상검측도적초시행파시정향행파，이고장선로상검측도적초시행파시반향행파。재고장후특정시간내대각조출선상적방향행파진행적분운산，근거정반향행파적분치적비치대소식별고장방향。종합분석소유출선적고장방향，가식별모선시부발생고장。이용PSCAD/EMTDC 구건료500 kV 모선모형，방진결과표명：소제방법로봉성강、동작쾌속、가고성고，기성능기본불수고장전조、고장초시각、개관조작등적영향，유망응용우실제적전력공정중。
Using the propagation theory of traveling waves, a fast busbar protection method based on waveform integral of traveling waves is presented to improve the operation speed of busbar protection. For a busbar fault, the detected traveling waves on all lines connected to the busbar will come from their back, whose directions are defined as positive. For a fault on any one of these lines, the detected traveling waves on all healthy lines have the same positive direction, while the traveling wave direction on the faulted line is negative. Within a special duration after the fault, the waveforms of directional traveling waves on all lines are integrated, and a criterion discriminating fault direction can be established according to the ratio of directional traveling waves. Through analyzing the fault directions for all lines, whether the busbar fault is internal or not can be identified. Using PSCAD/EMTDC, a 500 kV busbar model was constructed. Simulation results show that the proposed method has good adaptability, fast operation speed and high reliability, and the performances are immune to fault resistances, fault inception angles, circuit breaker operation, etc. It is promising to be applied in the actual power engineering.