High-voltage single-core cable protective covering grounding online monitoring device and control method

Abstract

The invention discloses a high-voltage single-core cable protective covering grounding online monitoring device and a control method. The high-voltage single-core cable protective covering grounding online monitoring device comprises an A phase current transformer, a B phase current transformer, a C phase current transformer, an A phase temperature sensor, a B phase temperature sensor, a C phase temperature sensor, a data collecting controller, a GPRS data transmission module and a monitoring device body. The high-voltage single-core cable protective covering grounding online monitoring device and the control method have the following advantages of being safe and reliable, strong in site adaptability and convenient and fast to use, and more specifically, diagnosis of grounding system faults is realized through the comparison of a grounding current monitoring value and a computed value, theoretical foundation and reference data for high-voltage cable operation monitoring are provided, so that cable accident risk is reduced, the safety and the reliability of city power grid operation are improved, and the probability that the cable grounding device is damaged is lowered to the minimum; the device is applicable to different types of grounding boxes with different grounding modes and mounting positions, has universal applicability, and is convenient to operate and simple and convenient to install; the cost of a cable terminal tower grounding system is greatly lowered, a detecting period is shortened, and manpower and material resources are saved.

Description

technical field [0001] The invention belongs to the technical field of power grid detection, and in particular relates to an on-line monitoring device and control method for high-voltage single-core cable sheath grounding. Background technique [0002] The metal sheath of 110kV and above single-core cables generally adopts the operation mode of cross-connected double-ended grounding or single-ended direct grounding. Under normal circumstances, the metal sheath has only tens of volts of induced voltage to the ground. When the grounding wire of the high-voltage cable terminal and the cross-interconnected grounding wire of the intermediate joint well are damaged and the outer sheath is completely lost to grounding, it will cause breakdown of the outer sheath or burnout of the sheath protector, and more seriously, it will cause the main insulation of the cable to break down. In this case, the metal sheath may be grounded at multiple points to form a circulating current, which n...

AI Technical Summary

Problems solved by technology

[0004] 1. A lot of manpower is invested, and guardians, recorders, and testers are required during the test process

[0005] 2. The workload is heavy, the work takes a long time, and the inspection cycle is longer due to manpower constraints

[0006] 3. There are dangers of electric shock and high fall during the test. When the grounding box is opened for testing, once the grounding system of the grounding box is damaged, a large grounding current will be generated, which will cause the staff to get an electric shock. It is even more dangerous when testing on a tower

Images