CAJ | 학술논문

采用分布参数建模，利用保护安装处测量电压和测量电流，实时计算故障点电压，根据保护安装处到故障点的电压降与故障距离呈双曲正切函数关系，求解故障线路阻抗。该保护方法适用于单相接地和相间故障距离保护。该方法在算法设计中考虑了故障点电压的影响，原理上消除了负荷电流和过渡电阻对保护动作性能的影响，比传统保护具有更好动作性能，同时实现低、中、高电阻短路故障情况有效判别。EMTDC仿真和现场录波数据测试验证了该方法正确性和有效性。
채용분포삼수건모，이용보호안장처측량전압화측량전류，실시계산고장점전압，근거보호안장처도고장점적전압강여고장거리정쌍곡정절함수관계，구해고장선로조항。해보호방법괄용우단상접지화상간고장거리보호。해방법재산법설계중고필료고장점전압적영향，원리상소제료부하전류화과도전조대보호동작성능적영향，비전통보호구유경호동작성능，동시실현저、중、고전조단로고장정황유효판별。EMTDC방진화현장록파수거측시험증료해방법정학성화유효성。
Utilizing distributed parameter modeling the voltage at fault point is calculated in real time by voltage and current measured at the installation position of distance protection, and according to the relation of hyperbolic tangent function between the voltage drop from installation position of the protection to the fault point and the fault distance the impedance of faulty line is solved. This protection method is suitable to the protection for single-phase earth fault protection and the distance protection for phase-to-phase fault. In the algorithm design of the proposed protection method the voltage at fault point is taken into account, thus the affects of load current and transition resistance on protection performance are eliminated in principle, so the proposed protection method possesses better protection performance than traditional protection, and the effective identification of short-circuit faults under low-, medium-or high-resistance can be implemented. The correctness and validity of the proposed method are proved by results of EMTDC simulation and the recorded field test data.