电流差动保护两种优良制动特性的分析比较

Analysis and Comparison of Two Excellent Restraining Characteristic of Pilot Current Differential Protection

利用相位特性分析法和幅值特性分析法对复合式动作判据和自适应方向纵差保护动作判据进行了分析比较,两种动作判据都具有优良的制动特性。对这两种动作判据在两侧电流不同取值及内部故障和外部故障等不同情况下分别进行详细的分析,可知自适应方向纵差保护动作判据优于复合式动作判据。

Compound pilot current differential operating criterion and adaptive directional pilot current differential operating criterion, a new operating criterion,are analysed and compared in this paper using phase characteristic analytical method and magnitude characteristic analytical method. Both operating criteria possess excellent restraining characteristic. Compound operating criterion and adaptive directional pilot current differential protective operating criterion are analysed respectively in detail when electric currents in two ends are different in case of all internal faults and external faults. The analysis given in the paper show that the adaptive directional pilot current differential protective operating criterion is better than the compound criterion.