Flow cable partial discharge online monitoring system

Abstract

The invention discloses a flow cable partial discharge online monitoring system, comprising a high frequency sensor, an extra-high frequency sensor, a preposition conditioning unit, a detection front end and a portable detection terminal, wherein the preposition conditioning unit comprises a preposition high frequency conditioning unit and a preposition extra-high frequency conditioning unit; the preposition high frequency conditioning unit is correspondingly connected with the high frequency sensor; the preposition extra-high frequency conditioning unit is correspondingly connected with the extra-high frequency sensor; the detection front end is connected with the preposition conditioning unit, and is used for collecting a signal transmitted by the preposition conditioning unit and sending relevant data after characteristic parameters of the signal are extracted; the portable detection terminal is wirelessly connected with the detection front end, and is used for receiving data sent by the detection front end and performing analysis and diagnosis on the data. The flow cable partial discharge online monitoring system is flexible and convenient to use, large in the coverage area, and capable of continuously working for a long time, greatly improving the antijamming capability of the field, and improving the reliability of a field detection result.

Description

technical field [0001] The invention relates to an insulation defect detection device, in particular to a cable insulation defect detection device. Background technique [0002] During the long-term operation of XLPE power cables, they are easily affected by factors such as electric field, thermal effect, mechanical stress, chemical corrosion and environmental conditions, and their insulation quality will gradually deteriorate, which may lead to the destruction of the insulation system. The power cable is a very important equipment in power transmission and transformation, and it has a bottleneck effect on the safe and stable transmission of power loads. The study found that the partial discharge of the cable is closely related to its insulation status, and the magnitude of the partial discharge indicates whether there are defects in the cable insulation that endanger its safe operation. The International Power Grid Conference (CIGRE) and other international power authority...

AI Technical Summary

Problems solved by technology

[0005] (1) The failure rate of the cable is low, the economy of the online monitoring system is not good, and the cost of the fixed-installed online monitoring system is high. Correspondingly, few insulation defects are found;

[0006] (2) The number of channels of portable testing equipment is too small, which is not suitable for simultaneous testing of multiple cable lines or intermediate joints of multiple cables. In addition, portable testing equipment cannot be used for occasions that are not suitable for personnel to approach (such as on-site withstand voltage tests);

[0007] (3) The existing technology uses a single sensor technology, which has poor anti-interference performance and high misjudgment rate

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