Medium-voltage single-core crosslink cable metal shielding layer failure detection device and detection method

Abstract

The invention discloses a medium-voltage single-core crosslink cable metal shielding layer failure detection device. The medium-voltage single-core crosslink cable metal shielding layer failure detection device comprises a power module, a human-machine interaction module, a detection module and a display module, wherein the power module is electrically connected with the human-machine interactionmodule, the detection module and the display module, and is used for supplying power to the human-machine interaction module, the detection module and the display module; an output end of the human-machine interaction module communicates with an input end of the detection module; a pulse command signal which is transmitted to human-machine interaction module by the user is transmitted to the detection module; an output end of the detection module communicates with a display module; and the display module is used for displaying pulse echo information of different amplitudes. The invention further discloses a medium-voltage single-core crosslink cable metal shielding layer failure detection method. The failure of the cable metal shielding layer is detected conveniently and safely by the low-voltage pulse echo principle, and the failure position of the metal shielding layer can be located accurately.

Description

technical field [0001] The invention relates to the technical field of fault detection of electric power facilities, and more specifically, to a fault detection device and a detection method for a metal shielding layer of a medium-voltage single-core cross-linked cable. Background technique [0002] 6-35kV medium-voltage cross-linked cables are widely used in my country's power systems and industrial enterprises, most of which are single-core designs, and the metal shielding layer of medium-voltage single-core cross-linked cables is used as an electrical shielding layer to ensure that the single-core The potential of each part of the outer conductive layer of the cross-linked cable is equal. Under normal circumstances, the metal shielding layer of the medium-voltage single-core cross-linked cable passes the charging current of the cable; when the cable fails, the metal shielding layer acts as a path for the fault current and can withstand the fault current. The safe operatio...

AI Technical Summary

Problems solved by technology

Among them, the high potential discharges to the low-potential metal layer through the semi-conductive outer shield, which can gradually burn the outer shield and damage the insulation. Finally, the electric field strength at this place is distorted, causing serious failures such as insulation breakdown and circuit short circuit.

Therefore, in actual work, it is necessary to prevent and eliminate the failure of the metal shielding layer of the medium-voltage single-core cable as early as possible to prevent future troubles. There are very few fault detection devices and methods dedicated to the cable metal shielding layer, and a few fault detection methods for the cable shielding layer, such as using a multimeter to test the continuity of the shielding layer, can determine whether there is a fault, but cannot judge The specific location of the fault, and the accuracy is not high, so a detection device and detection method that can effectively detect the fault of the metal shielding layer of the medium-voltage single-core cross-linked cable needs to be studied urgently

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