Cable Joint Fault Detection Equipment Based on Traveling Wave Method

Abstract

The invention relates to cable joint fault detection equipment based on a traveling wave method. The cable joint fault detection equipment is characterized by comprising a traveling wave pulse signaltransceiver and an upper computer, wherein the traveling wave pulse signal transceiver is used for emitting traveling wave pulse signals and acquiring voltage values of reflection signals of the traveling wave pulse signals; the upper computer comprises a simulation model database and a processor, voltage simulation waveforms Vm=[Vm1, Vm2,..., VmN] of N cable joint faults within time T are storedin the simulation model database, wherein the value of i in any voltage simulation waveform Vmi=[Vmi1, Vmi2,..., VmiN] is 1-N, namely that each simulation waveform includes n voltage values; and the processor is used for carrying out computer programs so as to realize relevant detection steps.

Description

technical field [0001] The invention relates to a cable joint fault detection device, in particular to a cable joint fault detection device based on a traveling wave method. Background technique [0002] During the operation of the power grid, the cable joint is the weakest link. About 70% of the cable faults occur at the joint. Therefore, it is of great significance to accurately and quickly determine the quality and operation status of the joint to ensure the safe and reliable operation of the power grid. At present, the main means of cable joint fault detection are temperature method and partial discharge method. The temperature method is to install a temperature sensor at the joint, and measure relevant parameters such as temperature and temperature rise rate; the measurement results are stored in the system control room through the corresponding transmission network, and compared with the historical records; if the joint temperature rises rapidly or If the temperature ...

AI Technical Summary

Problems solved by technology

However, this fault detection method still has the following technical problems: the waveform interpretation of the reflected signal requires the relevant professional knowledge and experience of field operators, that is, when the operator observes such as but not limited to figure 1 When using either of the two waveforms shown, only relevant professional knowledge can accurately determine whether the cable is faulty, as well as the type and location of the fault

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