Cable welding point fault monitoring device and method

Abstract

The embodiment of the invention discloses a cable welding point fault monitoring device, and the device comprises a protection shell which sleeves a cable, wherein the two ends of the cable are exposed out of the protection shell; a first temperature sensor which is located in the protection shell, is arranged at a welding point of the cable and is used for collecting a first temperature signal; a second temperature sensor which is located in the protection shell and is arranged at other positions on the cable, and is used for collecting a second temperature signal; an antenna which is located on the surface of the protection shell and sends the first temperature signal, the second temperature signal and the position information to a monitoring end, so that the monitoring end determines whether the welding point breaks down or not according to the difference value between the first temperature signal and the second temperature signal and determines the position of the welding point where the welding point breaks down according to the position information; and an extraction opening positioned on the surface of the protection shell. The embodiment of the invention further discloses a cable welding point fault monitoring method. The temperature state of the welding point can be monitored in real time, and when the welding point breaks down, the position where the fault occurs is located in time.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a cable welding point fault monitoring device and method. Background technique [0002] In the power system, cables are more and more widely used in underground scenes such as subways and pits, and cable fault maintenance and post-maintenance monitoring play an increasingly important role in the power system. Due to the manufacturing process of the cable, the installation environment, etc., the welding points of the intermediate joints are prone to dimensional deviation, undercut, pores, incomplete penetration, slag inclusions, cracks, welding tumors, etc., resulting in welding points that are most prone to failure. weak point. [0003] At present, when protecting the intermediate joint of the cable, that is, the welding point, only multi-layer insulation protection is done at the welding point, and physical protection is done outside the cable. This method cannot timely ...

AI Technical Summary

Problems solved by technology

This method cannot timely determine whether the welding point is faulty, and cannot locate the position of the faulty welding point. At the same time, because the cables are mostly buried underground or laid in cable trenches, it is very difficult to find the faulty welding point.

Once the welding point fails, and the shielding layer is cut off, the electric field distortion will be caused, and the electric field stress at the cut-off place will be concentrated, and the temperature will be too high, and even the cable will be damaged.

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