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Early-warning method and system for overheating risk for cable lines of distribution network

A cable line, risk warning technology, applied in the direction of measuring electricity, measuring electrical variables, detecting faults according to conductor types, etc. Real-time monitoring and prediction, low cost, good practicability

Pending Publication Date: 2019-02-12
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, the traditional method of relying on temperature measurement for early warning of cable overheating risk is both inaccurate and prone to failure, and the existing equipment cannot directly monitor the operating temperature of the conductor inside the conductor, which is generally limited to the outer skin or metal sheath of the cable. The temperature measurement cannot timely and accurately perceive the temperature rise of the cable line and give an early warning of the development trend of the cable line overheating phenomenon

Method used

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  • Early-warning method and system for overheating risk for cable lines of distribution network
  • Early-warning method and system for overheating risk for cable lines of distribution network
  • Early-warning method and system for overheating risk for cable lines of distribution network

Examples

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Effect test

Embodiment 1

[0048] The process flow of a method for early warning of overheating risk of distribution network cables is as follows: figure 1 shown, including:

[0049] Step 1: Calculate the resistance value of the cable line historical period;

[0050] Step 2: Determine the resistance value of the cable line in the forecast period according to the resistance value of the cable line in the historical period;

[0051] Step 3: Pre-warn the risk of overheating of the cable line according to the pre-set cable line overheating risk warning rules and the resistance value of the cable line in the historical period and the predicted period;

[0052] Among them, the overheating risk warning rule of the cable line includes the resistance threshold determined according to the linear relationship between the body temperature and the resistance and the maximum rated temperature.

[0053] Specifically, the calculation of the resistance value of the historical period of the cable line includes:

[005...

Embodiment 2

[0098] Based on the same inventive concept, the present invention also provides a distribution network cable line overheating risk warning system. Since the principle of these devices to solve technical problems is similar to the distribution network cable line overheating risk warning method, the repetition will not be repeated.

[0099] The basic structure of the system is as figure 2 As shown, including: historical resistance module, future resistance module and early warning module;

[0100] The historical resistance module is used to calculate the resistance value of the cable line in the historical period;

[0101] A future resistance module for determining the resistance value of the cable line during the forecast period;

[0102]The early warning module is used to perform early warning of the overheating risk of the cable line according to the pre-set cable line overheating risk early warning rules and the resistance value of the cable line in the historical period a...

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Abstract

The invention provides an early-warning method and a system for an overheating risk for cable lines of a distribution network. The method comprises steps of: calculating resistance values of the cablelines in the historical period; determining resistance values of the cable lines in the prediction period according to the resistance values for the cable lines in the historical period; implementingthe early-warning of the overheating risk for the cable lines, according to a preset early-warning rule for overheating risk for cable lines and the resistance values of the cable lines in the historical period and the prediction period, wherein the early-warning rule for overheating risk for cable lines comprises a resistance threshold value, which is determined from the highest rated temperature and the linear relationship between the body temperature and the resistance. According to the early-warning method and the system for the overheating risk for cable lines of the distribution network, the method and the system can effectively realize the real-time monitoring and the prediction for the impedance parameters of cable lines of the distribution network; can accurately predict the overheating risk of the cable lines of the distribution network; has the advantages of being good in practicability, small in cost, simple in calculation, and easy to operate; and can provide a decision basis for the grid operator to operate and to maintain the cable lines.

Description

technical field [0001] The invention belongs to the field of power systems and automation thereof, and in particular relates to a method and system for early warning of overheating risks of distribution network cable lines. Background technique [0002] The temperature rise and heat generation of cables in operation have always been the focus of distribution network operation. Excessive cable temperature will accelerate insulation aging, shorten cable life, and may even cause cable fires. If the on-line monitoring and early warning of cable overheating can be carried out, the deterioration of cable insulation can be found in time, and possible hidden failures can be eliminated. At this stage, the traditional method of relying on temperature measurement for early warning of cable overheating risk is both inaccurate and prone to failure, and the existing equipment cannot directly monitor the operating temperature of the conductor inside the conductor, which is generally limit...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 张瑜宋晓辉盛万兴孟晓丽李建芳高菲李雅洁赵珊珊
Owner CHINA ELECTRIC POWER RES INST
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