| 摘要 |
In a machine implemented method and a system for protecting an electric power system, a differential equation v=L(di/dt)+Ri is solved by using an approximation <IMAGE> (3) to determine the inductance L and to measure or discriminate the distance from the determined inductance, where v represents the voltage, i represents the current, R represents the resistance, t represents the time, tk and tk-1 represent time points, ik+p and ik-p-1 represent values of the current i for time points represented by tk+p and tk-p-1, p represents integers (0, 1, . . . N), N represents a natural number, Kp (p=0, 1, . . . N) represents constants, with at least K0 and K1 being values other than zero and being so determined that the errors in the approximation for the inductance is zero for specified frequencies. |
