A method for estimating the insulation life of xlpe cable based on double-ended balance factor

A balance factor and cable insulation technology, applied in the direction of measuring electricity, measuring only current, measuring electrical variables, etc., can solve problems such as threats to the safe operation of the power grid, accelerated cable insulation aging, cable faults, etc., to enrich test parameters and data, reduce The frequency and time of power outages and the effect of ensuring reliable operation

Active Publication Date: 2022-02-01
YUNNAN POWER GRID CO LTD LINCANG POWER SUPPLY BUREAU +1
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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 method for estimating the insulation life of xlpe cable based on double-ended balance factor
  • A method for estimating the insulation life of xlpe cable based on double-ended balance factor
  • A method for estimating the insulation life of xlpe cable based on double-ended balance factor

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Embodiment Construction

[0049] Below in conjunction with flowchart, the present invention will be further described:

[0050] according to figure 1 Cable leakage current test platform wiring diagram, the specific calculation steps of the present invention are as follows:

[0051] Step 1: Build a cable leakage current test platform

[0052] The test platform includes: high-frequency voltage source 1, No. 1 port 2 of high-frequency voltage source 1, high-voltage test line 3, test cable 4, terminal 5 of test cable 4, No. 1 high-frequency current transformer 6, and No. 1 grounding wire 7. No. 2 high-frequency current transformer 8, No. 2 grounding wire 9, No. 1 signal transmission line 10, data collector 11, No. 2 signal transmission line 12, No. 3 signal transmission line 13, upper computer 14, high-frequency voltage source 1 No. 2 port 15, No. 3 ground wire 16;

[0053] Connect the terminal 5 of the test cable 4 to the No. 1 port 2 of the high-frequency voltage source 1 through the high-voltage test...

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Abstract

The invention is a method for estimating the insulation life of an XLPE cable based on a double-ended balance factor. The invention first builds a cable leakage current test platform to test the leakage current of a long-running XLPE cable; then calculates No. 1 high-frequency current transformer (5 ) 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 factor to estimate the XLPE cable insulation life. The beneficial effect of the present invention is that the insulation life of the XLPE cable to be tested can be evaluated in a real-time, accurate and simple manner, especially for the long-term running XLPE cable, which can effectively reduce the number of power outage maintenance and ensure the safe and reliable operation of the cable in operation. Reduce the frequency and time of power outages in the power grid to ensure reliable operation of the power grid.

Description

technical field [0001] The invention belongs to the field of cable insulation aging state evaluation, and in particular relates to a method for estimating the life of an XLPE cable insulation based on a double-end balance factor. 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 st...

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 王科项恩新赵现平聂鼎黄继盛
Owner YUNNAN POWER GRID CO LTD LINCANG POWER SUPPLY BUREAU
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