High-voltage single-core cable sheath grounding current on-line monitoring device and control method

Abstract

Provided are a high-voltage single-core cable sheath grounding current on-line monitoring device and a control method. The high-voltage single-core cable sheath grounding current on-line monitoring device comprises an A-phase current transformer, a B-phase current transformer, a C-phase current transformer, a current data acquirer, a general packet radio service (GPRS) data transmission module and a monitoring device, wherein the A-phase current transformer, the B-phase current transformer and the C-phase current transformer are installed a sheath grounding layer ground wires of an A-phase single-core cable, a B-phase single-core cable and a C-phase single-core cable. Three input ends of the current data acquirer are connected with the A-phase current transformer, the B-phase current transformer and the C-phase current transformer respectively, and the output end of the current data acquirer is connected with the GPRS data transmission module. The GPRS data transmission module is connected with the monitoring device in a wireless mode. The high-voltage single-core cable sheath grounding current on-line monitoring device and the control method have the advantages of being safe, reliable, strong in site applicability, convenient and quick.

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 grounding current of a high-voltage single-core cable sheath. Background technique [0002] In the power industry, the metal sheath of 110kV and above high-voltage 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-connection grounding wire of the intermediate joint well are damaged and the outer sheath is completely lost to grounding, it will cause the outer sheath to strike. In this case, the metal sheath may be grounded at multiple points and form a circulating current, which not only reduces the current carrying capacity of the cable, but also wastes...

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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

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