High-voltage cable sheath circulation monitoring device and fault positioning method

Abstract

The invention provides a high-voltage cable sheath circulation monitoring device and a fault positioning method. The monitoring device comprises a monitoring terminal, a current transformer installedat a high-voltage cable joint for measuring the current of a high-voltage cable, a grounding circulation collecting device connected with a sheath of the high-voltage cable joint, and a signal transmission device; the grounding circulation collecting device is installed inside the monitoring terminal; the current transformer is connected with the monitoring terminal through a collecting interface;the outer circumference of the high-voltage cable joint is sleeved with an electromagnetic shielding sleeve; the outer circumference of the electromagnetic shielding sleeve is sleeved with an annularmetal sheath; the annular metal sheath is wrapped at the outer circumference of the current transformer; and a heat dissipation cavity is formed between the annular metal sheath and the current transformer, and an electromagnetic shielding layer is disposed at one side of the annular metal sheath close to the current transformer. According to the high-voltage cable sheath circulation monitoring device provided by the invention, real-time monitoring of the grounding circulation of a grounding box can be realized, an abnormal current fault can be timely found, and automatic alarm is carried outin the background, so that the safe operation of the cable is ensured.

Description

technical field [0001] The invention relates to a high-voltage cable sheath circulation monitoring device and a fault location method. Background technique [0002] With the rapid development of urbanization, the degree of urban power cable is rapidly increasing, and underground cables have become the main components of urban power grids. Due to the long-term operation of some cables, the grounding resistance will become larger and the cable insulation effect will become worse. The on-site construction technology and quality of multi-point grounding or grounding are not up to standard, which will cause the circulation of the cable to increase, and the effect of grounding will directly affect the service life of the cable, so the problem of cable grounding has become particularly important. At present, the cable sheath circulation mainly adopts manual regular inspection, but due to the complex laying conditions of the cable, the inspection is difficult, and it is easy to make...

AI Technical Summary

Problems solved by technology

[0004] (1) Manual inspection, high investment cost, incomplete data, lack of practicability

[0005] (2) Daily intermittent inspections may miss or fail to detect ground faults in time, resulting in safety accidents in cable operation

[0006] (3) Ordinary grounding boxes are transformed into intelligent grounding boxes with circulation monitoring, especially the intelligent transformation of old grounding boxes into intelligent grounding boxes. There are problems such as high cost, power outage construction, and heavy workload.

[0007] (4) Conventional monitoring equipment has problems such as cumbersome wiring and heavy workload for mains cables

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