METHOD OF DETERMINING DISTANCE TO SINGLE-PHASE SHORT-CIRCUIT POINT ON ELECTRIC POWER LINE

摘要

FIELD: electricity.SUBSTANCE: before testing, the damaged line is disconnected from the working source and phases of the damaged line are connected to each other at the receiving end. Test voltage U is applied across the damaged line relative the earth and values of test currents Iand Iin the intact and damaged phases of the line are measured. The value of resistance Rfrom the supply end of the line to the point of damageis found. The distance l from the point of application of test voltage to the point of the single-phase short-circuit is determined using a formulawhere Ris the resistance of the intact phase of the line, L is the length of the line. Measurement accuracy is increased by measuring the actual resistance of the intact phase of the electric power line before testing using the relationship R=0.5 U/I. To this end, a test source is connected to two phases of the damaged line and test current I is measured. Accuracy is also increased if direct test voltage is used.EFFECT: broader functional capabilities and high accuracy of the method.3 cl, 1 dwg