On-line fault location device for high-voltage power cable

Abstract

The invention provides an on-line fault location device for a high-voltage power cable. The on-line fault location device comprises a first terminal and a second terminal which are respectively arranged at two ends of the high-voltage power cable and are in fiber connection with each other, as well as a data processing unit, wherein the first terminal is used for receiving fault generated traveling waves generated by a fault point and simultaneously sending a pulse signal to the second terminal; the second terminal is used for receiving the fault generated traveling waves generated by the fault point, as well as the pulse signal, and recording the time difference value between the fault generated traveling waves and the pulse signal; and the data processing unit is used for calculating the position of the fault point in the high-voltage power cable according to the time difference value. By adopting the technology provided by the invention, the high-voltage power cable can be monitored in a real time manner, and when the major insulation of the cable fails to work, reliable triggering of two-end timing equipment is realized by virtue of pulse waves which are generated at the fault point by the self energy of a power system, and analysis and calculation are carried out according to the timing data so as to acquire the position of the fault point in the high-voltage power cable, so that on-line monitoring and accurate location are achieved, the fault location efficiency is high and the fault location cost is low.

Description

technical field [0001] The invention relates to cable fault location technology, in particular to an online fault location device for high-voltage power cables. Background technique [0002] At present, the high-voltage cable insulation fault location technology mainly adopts the pulse method based on off-line testing. The distance is based on the parameter model of the cable line, the pulse signal is applied to the cable on site, and then the distance to the fault point is calculated by the propagation time and speed of the voltage and current traveling wave signal in the cable. [0003] This method has obvious disadvantages. After the cable fails, the cable outlet needs to be withdrawn from operation, and then the fault measurement equipment is transported to the site, and the measurement equipment and wiring are arranged before the measurement can be started; Pulse impact causes flashover at the fault point, so the energy storage capacitor needs a large capacity, which i...

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide an online high-voltage power cable fault location device for the existing pulse method in the process of locating high-voltage cable insulation fault points with low efficiency and high cost.

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