Fault diagnosis method of cable joint and fault diagnosis device of cable joint

Abstract

The embodiment of the present invention provides a fault diagnosis method of a cable joint and a fault diagnosis device of a cable joint. The fault diagnosis method of the cable joint comprises: obtaining a first temperature of each monitoring point at the joints of at least two cables and a second temperature of an environment at the joints of the at least two cables; calculating temperature rise data of each monitoring point at the joints of the cables with respect to the environment according to the obtained first temperature and second temperature; and determining whether the cable joints have faults or not according to the temperature rise data. According to the fault diagnosis method of the cable joint and the fault diagnosis device of the cable joint, fault monitoring of the cable joint may be realized, potential risk caused by the faults of the cable joint may be avoided, and the precision requirement of a temperature sensor is low so that the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of cable fault monitoring, in particular to a fault diagnosis method and device for a cable joint. Background technique [0002] In large-scale power supply systems, more and more power cables are used for power transmission and distribution. Faults caused by power cables are the main factor affecting the normal supply of electricity. However, cable operation failures mostly occur at the cable joints. Generally, the existing fault diagnosis methods for cable joints are mainly suitable for high-voltage power systems, and are not suitable for fault monitoring of multi-core cable joints. [0003] Take the power cables used in the wind power field as an example. Due to the high height of the generator, the construction is more difficult, and the power cables are generally connected by cable joints. Because the construction quality of the cable joint is not high, and abnormal conditions such as vibration and ...

AI Technical Summary

Problems solved by technology

Because the construction quality of the cable joint is not high, and at the same time, abnormal conditions such as vibration and falling will occur during the operation of the wind turbine, resulting in loosening of the cable joint, and then there will be quality problems such as increased contact resistance

What follows is that the operating temperature of the cable joints increases accordingly, thereby accelerating the aging of the insulation at the joints, increasing the probability of partial discharge and forming a vicious circle, which eventually leads to high temperature failures and cable fires

[0004] The power cable is a multi-core cable joint, therefore, the existing method is not suitable for the fault diagnosis of the power cable, nor can it avoid the potential safety hazards caused by the failure of the cable joint

In addition, the existing technology usually directly uses the temperature measurement results as the basis for fault judgment. Therefore, in order to improve the accuracy of fault judgment, it is necessary to use a high-precision temperature measurement device, which in turn leads to high fault diagnosis costs.

Images