| 摘要 |
PURPOSE:To calculate distance to a fault point based on hourly changes in the value of affected current by automatically memorizing the affected current in a substation or the like when a short-circuit trouble occurs in a DC line such as feeding circuit. CONSTITUTION:A load current i0 flows to the time t0 when a trouble occurs, Following t0, it increases sharply to reach its maximum im at the time tm and then, decreases sharply to be cut off at the time te. When a DC voltage E(V) is applied to a series connection between an inductance L (Henry) and a resistance R (ohm), current i (ampere) flowing is given by the equation. The waveform before the cutting off of the affected current with a breaker is represented by an exponential function. With this as premise, the constant of the circuit is calculated from the waveform to identify the distance to the fault point. |
