Partial discharge detection device and method of netted differential cable joint

Abstract

The invention relates to a partial discharge detection device and method of a mesh differential cable joint. The partial discharge detection device of a mesh differential cable joint includes a signal detection unit and a signal processing unit, and the signal detection unit and the signal processing unit are arranged on the cable joint. The signal detection unit is a mesh structure, which adopts a multi-chip distributed layout to form an angle difference; the signal processing unit uses the differential detection principle to process multiple groups of signals transmitted by the signal detection unit. The partial discharge detection device of the mesh differential cable joint uses the differential signal detection method on the cable joint capacitive sensor to detect the partial discharge signal. The built-in capacitive sensor of the cable joint adopts a mesh structure, which not only increases the detection area, but also The capacitance value is reduced, and it can be conveniently installed outside the silicone rubber layer of the cable joint and inside the copper shell.

Description

technical field [0001] The invention relates to the field of high-voltage electricity technology, in particular to a mesh differential cable joint partial discharge detection device and a method for detecting cable joint partial discharge using the mesh differential cable joint partial discharge detection device. Background technique [0002] The partial discharge of high-voltage XLPE cables is the main factor causing high-voltage cable accidents, and has been widely concerned for many years. The reason is mainly due to the defects in the insulating parts of the cables, which generate partial micro discharges. The discharge process accelerates the deterioration of cable insulation performance, which eventually leads to cable breakdown. How to measure the early partial discharge of cables is of great significance to the prevention of cable accidents. On the other hand, since the electric field stress of the middle joint of the power cable is relatively concentrated, it is t...

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Problems solved by technology

[0007] Disadvantage 1: First, it is difficult to make a choice in the production of the capacitance detection sensor. The capacitance sensor is too small, and the range of discharge detection is small. Due to the randomness of the discharge position, the small capacitance sensor cannot completely detect the discharge position of the cable connector; If the capacitive sensor is bigger and covers a wider area, the capacitance value will also increase accordingly; when the cable discharge capacity Q value is constant, the larger the capacitance C value, the smaller the voltage

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