State monitoring method and system for power cable terminal equipment based on infrared thermogram

A technology of terminal equipment and power cables, applied in the field of state monitoring of power transmission and transformation equipment in the power grid, to achieve the effect of high detection accuracy

Active Publication Date: 2021-09-24
STATE GRID HUNAN ELECTRIC POWER +2
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  • Abstract
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  • Claims
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Problems solved by technology

[0015] The technical problem to be solved by the present invention: Aiming at the above-mentioned problems of the prior art, a method and system for monitoring the state of power cable terminal equipment based on an infrared heat map are provided. In the present invention, infrared temperature measurement is an effective means for finding overheating defects of cable terminals

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  • State monitoring method and system for power cable terminal equipment based on infrared thermogram
  • State monitoring method and system for power cable terminal equipment based on infrared thermogram
  • State monitoring method and system for power cable terminal equipment based on infrared thermogram

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[0044] like figure 1 , The condition monitoring method based on the power cable termination device according to the infrared image of the embodiment comprises:

[0045] 1) For the infrared hot pattern I to be treated, the foreground area and background area of ​​the target power cable terminal device is divided;

[0046] 2) the background area calculated average temperature T a Average temperature T in the foreground area is divided into sub-regions foreground specified size, and calculates an arbitrary m-row n-th column of the foreground sub-region N ;

[0047] 3) The temperature in the foreground sub-regions of any m-th row n-th column of the average T N , The average temperature of the background region T a Analyzing the target temperature difference between the power cable termination device is faulty.

[0048] In this embodiment, step a) comprises:

[0049] 1.1) The readout device data feature point position set is set from the reading device data feature point position set {...

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Abstract

The invention discloses a state monitoring method and system for power cable terminal equipment based on an infrared thermogram. The method comprises the steps of segmenting a foreground region and a background region of target power cable terminal equipment for a to-be-processed infrared thermogram i; calculating a temperature average value Ta of the background region, dividing the foreground region into foreground sub-regions, and calculating a temperature average value TN in the foreground sub-regions; and judging whether the target power cable terminal equipment has a fault or not according to the temperature difference between the temperature average value TN in the foreground sub-region of any m-th row and n-th column and the temperature average value Ta in the background region. Infrared temperature measurement is an effective means for discovering the overheating defect of the cable terminal, various cable terminal defects are analyzed through background temperature differences, the monitoring efficiency can be effectively improved, the working temperature state of the target power cable terminal equipment can be accurately and timely judged, and method has the advantages of high detection accuracy, capability of realizing remote detection, safety and reliability.

Description

Technical field [0001] The present invention relates to a state monitoring technique of power grid transmission electrical devices, and more particularly to a state monitoring method and system of a power cable terminal device based on an infrared thermogram. Background technique [0002] The cable line has the advantages of high supply reliability, small area, beautify the city, and the power cable line has been more and more widely used in Hunan Power Grid; rubber-plastic cross-linking power cable (referred to as XLPE cable) due to its excellent electrical performance. Features such as heat resistance and mechanical properties, are widely used in the cable line, and the usage is increasing. The cable attachment production is completed by ordinary construction, and the installation process is not proficient. The cable supervision level is low, and some cable accessories are defective. For example, the 35 kV cable is in a blind spot, the health state is basically out of control, ...

Claims

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Application Information

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IPC IPC(8): G01N25/72G01N21/88
CPCG01N25/72G01N21/88
Inventor 段建家曾泽宇刘三伟段肖力黄福勇
Owner STATE GRID HUNAN ELECTRIC POWER
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