| 摘要 |
<p>Method for locating a fault on a power line and equipment for carrying out the method. The power line located between two stations (P,Q), the line being included in a multiphase distribution or transmission system. The voltage distribution along the line, seen both from station P to station Q and from station Q to station P, is obtained with the aid of a device comprising a travelling wave model of the line located in measure stations (P,Q) at either end of the line. A voltage DELTA UQp is formed as the difference between the voltage in station P, calculated in the travelling wave model in station Q and the corresponding voltage one period/half-period earlier. A voltage DELTA UPp is formed as the difference between the voltage in station P, calculated in the travelling wave model in station P and the corresponding voltage one period/half-period earlier. The corresponding voltage differences DELTA UPp and DELTA UQq are calculated for station Q. The voltage difference DELTA P is then formed as the difference between DELTA UQp and DELTA UPp, and the corresponding voltage difference DELTA Q is formed as the difference between DELTA UPq and DELTA UQq. The fault distance PF is then obtained as PF = DELTA P PQ/( DELTA P + DELTA Q), where PQ is the distance between the stations. </p> |
