Cable insulation degradation type discrimination method and system based on fuzzy evaluation method

A technology for cable insulation and fuzzy evaluation, applied in information technology support systems, measurement of electrical variables, dielectric performance measurement, etc., can solve the problems of different development levels, improve power supply reliability, increase maintenance efficiency, and have significant practical value Effect

Active Publication Date: 2019-07-09
STATE GRID SHAANXI ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the deterioration phenomenon of the cable may include more than one form, and the development degree is different, the current traditional method is difficult to meet the requirements of today's on-site targeted maintenance strategy

Method used

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  • Cable insulation degradation type discrimination method and system based on fuzzy evaluation method
  • Cable insulation degradation type discrimination method and system based on fuzzy evaluation method
  • Cable insulation degradation type discrimination method and system based on fuzzy evaluation method

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Embodiment Construction

[0058] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0059] A method for distinguishing cable insulation degradation types based on fuzzy evaluation method in an embodiment of the present invention includes three parts: FDS test, parameter extraction method based on improved H-N model, and fuzzy evaluation of extracted parameters.

[0060] In the FDS test method section, it includes: preparations before the test, test wiring, specific test procedures and precautions.

[0061] The preparatory work before the test includes: the test is carried out under the condition of ambient temperature -5 ~ 45 ℃ and relative air humidity not greater than 80%; the power supply voltage of the equipment fluctuates at 220±20V, and the power frequency fluctuates within the range of 50±0.5Hz ;Before the test, the power must be cut off and grounded for at least 2 hours and the joints must be wiped with absol...

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Abstract

The invention discloses a cable insulation degradation type discrimination method and system based on a fuzzy evaluation method, and the method comprises the following steps: obtaining the complex polarizability x* of a to-be-tested cable through an FDS test, wherein the complex polarizability x* comprises a real part x and an imaginary part x; by a parameter extraction method of an improved H-N model, obtaining polarization xre, direct current conductance dc and jump conductance Delta according to the obtained complex polarizability x*; and judging the insulation degradation type of the cableto be tested based on a fuzzy evaluation method according to the obtained polarization re, direct current conductance dc and jump conductance Delta. According to the cable insulation degradation typediscrimination method, accurate identification of the degradation type of the XLPE cable can be realized.

Description

technical field [0001] The invention belongs to the technical field of high voltage and insulation, and in particular relates to a method and system for discriminating cable insulation degradation types based on a fuzzy evaluation method. Background technique [0002] At present, with the improvement of aesthetic requirements and the limitation of transmission and distribution corridors, cables have become the most important transmission equipment in urban transmission and distribution networks. During the long-term operation of cross-linked polyethylene (XLPE) cables, the cables will be degraded by aging and moisture under the influence of the external environment. The appearance of deterioration will seriously affect the safe and stable operation of the cable, and will also have a serious negative impact on the reliability of the power grid. [0003] Existing technologies can diagnose whether XLPE cables are degraded, but diagnosing the specific degradation type is still ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G01R27/26
CPCG01R27/2617G06F30/20Y04S10/50
Inventor 赵学风赵艾萱蒲路林涛段玮孙浩飞李嘉明陈曦徐龙邓军波张冠军
Owner STATE GRID SHAANXI ELECTRIC POWER RES INST
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