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A Cable Life Prediction Method Based on Leakage Current Difference Coefficient

A technology of leakage current testing and leakage current, applied in the direction of measuring current/voltage, only measuring current, measuring electricity, etc., can solve problems such as threatening the safe operation of the power grid, accelerating cable insulation aging, and air gaps, so as to avoid cable insulation breakdown The effect of the accident

Active Publication Date: 2022-04-26
YUNNAN POWER GRID CO LTD LINCANG POWER SUPPLY BUREAU
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  • Claims
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Problems solved by technology

For XLPE cables running for a long time in the power grid, on the one hand, the external environment changes, which makes the cable insulation suffer from humidity, high and low temperature alternation, and high and low air pressure. Both accelerate the development of cable insulation aging and form defects such as air gaps, causing cable failures and seriously threatening the safe operation of the power grid.

Method used

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  • A Cable Life Prediction Method Based on Leakage Current Difference Coefficient
  • A Cable Life Prediction Method Based on Leakage Current Difference Coefficient
  • A Cable Life Prediction Method Based on Leakage Current Difference Coefficient

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Embodiment Construction

[0042] Below in conjunction with flowchart, the present invention will be further described:

[0043] according to figure 1 Cable leakage current test platform wiring diagram, the specific calculation steps of the present invention are as follows:

[0044] Step 1: Build a cable leakage current test platform

[0045] Connect the No. 1 port 2 of the high-frequency voltage source (1) to the terminal 5 of the test cable 4 through the high-voltage test line 3, put the No. 1 high-frequency current transformer 6 into the No. 1 grounding wire 7 of the test cable 4, and connect the 2 No. 2 high-frequency current transformer 8 is inserted into No. 2 ground wire 9 of test cable 4, No. 1 high-frequency current transformer 6 is connected to data collector 11 through No. 1 signal transmission line 10, No. 2 high-frequency current transformer 8 Connect the data collector 11 with the No. 2 signal transmission line 12, connect the data collector 11 with the upper computer 14 through the No. ...

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Abstract

The invention is a cable life prediction method based on the leakage current difference coefficient. The invention first builds a cable leakage current test platform to test the leakage current of XLPE cables that have been running for a long time; Disturbance rate, offset rate, displacement coefficient and No. 2 high-frequency current transformer (7) offset rate, displacement coefficient, disturbance rate; finally calculate the leakage current difference coefficient, which can predict the life of the XLPE cable. The beneficial effect of the present invention is that it can efficiently and accurately detect the leakage current of the XLPE cable in operation, and predict the service life of the cable to be tested through the method described in the invention, so as to avoid problems caused by cable aging or insulation defects. Cable insulation breakdown accidents can lay the foundation for ensuring the safe operation of cables.

Description

technical field [0001] The invention belongs to the field of cable insulation aging state evaluation, and in particular relates to a cable life prediction method based on leakage current difference coefficient. Background technique [0002] Cross-linked polyethylene (XLPE) is widely used in distribution network cables because of its simple structure, light weight, good heat resistance, strong load capacity, chemical corrosion resistance, and high mechanical strength. For XLPE cables running for a long time in the power grid, on the one hand, the external environment changes, which makes the cable insulation suffer from humidity, high and low temperature alternation, high and low air pressure, etc. Both accelerate the development of cable insulation aging and form defects such as air gaps, causing cable failures and seriously threatening the safe operation of the power grid. [0003] Therefore, in order to efficiently and conveniently evaluate the aging state of cables and r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R31/00G01R19/00G01R31/52G01R31/58
CPCG01R31/1272G01R31/003G01R19/0092
Inventor 黄继盛项恩新周利军
Owner YUNNAN POWER GRID CO LTD LINCANG POWER SUPPLY BUREAU
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