SHORT-CIRCUIT CURRENT DETERMINATION SYSTEM, SHORT-CIRCUIT CURRENT DETERMINATION METHOD AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a short-circuit current determination system, a short-circuit current determination method and a program that can determine whether short-circuit current is caused by breaking of a circuit breaker.;SOLUTION: A short-circuit current determination system 3 includes a detector 30 and a determination unit 31. The detector 30 detects the waveform of the current I1 flowing through an electrical path L2 on the secondary side of a branch breaker 2. The determination unit 31 determines the state of the branch breaker 2 based on the waveform detected by the detector 30. When a first condition and a second condition are satisfied, the determination unit 31 determines that the branch breaker 2 is in a cutoff state by short-circuit current of the current I1. The first condition is that the magnitude of the current I1 has changed from a first state where the magnitude reaches a threshold value to a second state where the magnitude becomes zero. The second condition is that at least one of the current value and the current amount of the current I1 estimated from at least one of the rising edge and the falling edge of the waveform at the transition time from the first state to the second state exceeds a specified value.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT