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Local defect aging diagnosis and evaluation method for power cable

A technology for local defects and power cables, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, instruments, etc., to reduce the amount of calculation, reduce the difficulty of calculation, and improve the probability of successful calculation

Active Publication Date: 2021-08-20
JIANGSU ELECTRIC POWER CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a local defect aging diagnosis and evaluation method for power cables, which solves the problem of local weak defect aging diagnosis of power cables in the related art

Method used

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  • Local defect aging diagnosis and evaluation method for power cable
  • Local defect aging diagnosis and evaluation method for power cable
  • Local defect aging diagnosis and evaluation method for power cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] The power cable to be tested in this embodiment is a 1000m ZR-YJV02 8.7 / 15 3*95mm2 power cable, and a resistor with an impedance of 1kΩ is connected in parallel at a position of 300m.

[0108] In this embodiment, an Agilent E5061B vector network analyzer is used to test the input impedance of the head end of the cable under test.

[0109] The local defect aging diagnosis method for power cables provided by this embodiment, such as figure 2 shown, including the following steps:

[0110] S10, frequency domain parameter test calculation

[0111] Set the sweep frequency range of the vector network analyzer to [10kHz, 5MHz], set the number of sweep points N to 1001 and set the input impedance Z at the head end of the power cable in (f) Conduct the test and then calculate the reflection coefficient Γ at the head end of the cable in (f):

[0112]

[0113] Calculated cable head end reflection coefficient Γ in (f) if image 3 shown. Where f is the scanning frequency p...

Embodiment 2

[0127] The power cable to be tested in this embodiment is a 1000m ZR-YJV02 8.7 / 153*95 mm2 power cable, and there is a local weak defect with a length of 1m at a position of 400m.

[0128] In this embodiment, an Agilent E5061B vector network analyzer is used to test the input impedance of the head end of the cable under test.

[0129] The local defect aging diagnosis method for power cables provided by this embodiment, such as figure 2 shown, including the following steps:

[0130] S10, frequency domain parameter test calculation

[0131] Set the sweep frequency range of the vector network analyzer to [10kHz, 5MHz], set the number of sweep points N to 1001 and set the input impedance Z of the cable head end in (f) Conduct the test and then calculate the reflection coefficient Γ at the head end of the cable in (f):

[0132]

[0133] Where f is the scanning frequency point; Z 0 It is the characteristic impedance measured by using a 10m long reference cable of the same mode...

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Abstract

The invention relates to the technical field of power cables, and particularly discloses a local defect aging diagnosis method for a power cable, and the method comprises the steps: S100, calculating the reflection coefficient of the head end of the power cable; S200, processing the reflection coefficient of the head end of the power cable to obtain a position vector of each local defect of the power cable; S300, calculating each local defect parameter of the power cable according to the position vector of each local defect of the power cable; and S400, diagnosing and evaluating the local defect aging degree of the power cable according to each local defect parameter of the power cable. The local defect aging diagnosis method for the power cable provided by the invention can be used to simply and effectively diagnose local weak defect aging of the power cable.

Description

technical field [0001] The invention relates to the technical field of power cables, in particular to a local defect aging diagnosis and evaluation method for power cables. Background technique [0002] With the further development of urbanization, power cables (hereinafter referred to as cables) have gradually become an irreplaceable part of urban power transmission and distribution networks. However, in actual operation, the cable will be affected by various factors such as electricity, heat, and machinery, which will lead to the decline of the insulation strength of the cable in some areas, thus affecting the safe and stable operation of the cable. In order to improve the power supply reliability of the power grid, it is necessary to diagnose the aging state of the local weak defects of the cable in the early stage of the cable fault, so as to accurately judge the insulation level of the cable and reduce the operation and maintenance cost of the power grid. [0003] The ...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R27/02G01R27/26
CPCG01R31/08G01R27/02G01R27/26Y04S10/52
Inventor 谢敏徐凯钱洁惠峻钱磊周凯孙庆明吴典
Owner JIANGSU ELECTRIC POWER CO
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