CN114184903A - 10kV XLPE cable aging state evaluation method based on electric tree state evaluation factor - Google Patents

10kV XLPE cable aging state evaluation method based on electric tree state evaluation factor Download PDF

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CN114184903A
CN114184903A CN202111304244.5A CN202111304244A CN114184903A CN 114184903 A CN114184903 A CN 114184903A CN 202111304244 A CN202111304244 A CN 202111304244A CN 114184903 A CN114184903 A CN 114184903A
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cable
state evaluation
tree
electrical
dielectric loss
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CN114184903B (en
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周利军
张海彬
刘聪
李�杰
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Southwest Jiaotong University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements

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Abstract

The invention discloses a 10kV crosslinked polyethylene cable aging state evaluation method based on electric tree state factors, which comprises the following steps: measuring the length and the area of an electric tree of the crosslinked polyethylene cable, measuring the dielectric loss tangent value of the cable, calculating the electric tree coefficient alpha of the cable, calculating the dielectric loss factor beta, calculating the state evaluation factor gamma of the electric tree, and determining the aging state of the cable through the state evaluation factor gamma of the electric tree. The invention has the beneficial effects that: the cross-linked polyethylene cable is sliced to observe the electrical tree form, the cable dielectric loss tangent value is collected, the electrical tree state evaluation factor is extracted to evaluate the insulation state of the cross-linked polyethylene cable, the insulation state of the cable can be evaluated conveniently and efficiently, the cable with serious aging state is replaced in time, power failure faults are reduced, and the safe and reliable operation of a power grid is guaranteed.

Description

10kV XLPE cable aging state evaluation method based on electric tree state evaluation factor
Technical Field
The invention belongs to the field of evaluation of insulation aging states of XLPE cables, and particularly relates to a 10kV XLPE cable aging state evaluation method based on an electrical tree state evaluation factor.
Background
Crosslinked polyethylene cables are widely used because of a series of advantages such as easy manufacturing, convenient installation and use, good electrical properties, and the like. The insulation performance of the cable is reduced due to the influence of various factors such as electrothermal effect, mechanical force and the like in the operation process, and the operation reliability of the cable is influenced. The electrical tree is an important manifestation of aging of the crosslinked polyethylene cable, and once the electrical tree is generated in the polymer, the electrical tree can easily cause cable failure to cause damage to electrical equipment.
In order to ensure the reliable operation of the cable, a method for effectively evaluating the aging state of the XLPE cable running in the power distribution network for a long time is urgently needed, and particularly, the aging state of the cable is determined by researching the treeing rule and mechanism. The method is an XLPE cable aging state evaluation method based on the electrical tree state evaluation factor, is simple to operate, and can effectively and accurately evaluate the aging state of the cable through the extracted electrical tree state evaluation factor.
Disclosure of Invention
The invention relates to an XLPE cable aging state evaluation method based on an electric branch state evaluation factor, which is used for evaluating the insulation aging state of an XLPE cable running for a long time in a power distribution network.
The technical scheme of the invention is as follows:
the first step is as follows: measuring the length and the area of an electric branch of the crosslinked polyethylene cable;
carrying out electrical aging treatment on the newly manufactured 10kV crosslinked polyethylene cable for 0, 24, 48, 72, … and 2400 hours, and taking the aged cable as a characteristic sample; performing core-pulling slicing treatment on the cable, and then putting the cable into a vessel containing silicone oil to be measured by a real-time microscopic digital camera system; the length of the electric tree of the characteristic sample is recorded as L1、L2、…LnIn units of μm. Measuring and calculating the ratio of the electrical branch area of the characteristic sample to the section area of the measured characteristic sample and recording as S1、S2、…SnFinally, measuring the length L of the electric tree of the sample to be evaluated, and the ratio S of the area of the electric tree of the sample to be evaluated to the area of the slice of the sample to be evaluated;
the second step is that: and (3) calculating the electrical tree coefficient alpha of the aged cable, wherein the calculation process is as follows:
Figure BDA0003339560330000021
wherein L is the length of the electrical branch of the cable to be evaluated, and S is the ratio of the area of the electrical branch of the cable to be evaluated to the test area of the electrical branch;
the third step: measuring the tangent value of the dielectric loss angle of the sample cable by a penicillin bridge method, and recording the tangent value as TD1、TD2、TD3、…TDn；
The fourth step: calculating the dielectric loss factor beta according to the following calculation process:
Figure BDA0003339560330000022
wherein TD is the dielectric loss tangent of the cable to be evaluated, TDmaxIs the maximum dielectric loss tangent, TD, of the characteristic sampleminThe minimum dielectric loss tangent value in the characteristic sample is taken;
the fifth step: calculating the electric tree state evaluation factor gamma according to the following steps:
Figure BDA0003339560330000023
and a sixth step: determining the aging state of the cable through the electrical tree state evaluation factor gamma:
if gamma is less than 2.36, the insulation of the target crosslinked polyethylene cable is slightly aged;
if gamma is more than or equal to 2.36 and less than 4.29, the insulation of the target crosslinked polyethylene cable is moderately aged;
if gamma is not less than 4.29, the insulation of the target crosslinked polyethylene cable is severely aged.
The method has the advantages that the aging state of the XLPE cable is evaluated accurately and the insulation state of the XLPE cable can be well evaluated by measuring the electrical tree information of the XLPE cable, collecting the dielectric loss angle tangent value of the cable, calculating the electrical tree coefficient and the dielectric loss factor and extracting the electrical tree state evaluation factor.
Drawings
FIG. 1 is a flow chart of a method for evaluating aging status of XLPE cable based on an electrical tree status evaluation factor according to the present invention;
Detailed Description
The invention is further described with reference to the accompanying drawings and the specific implementation procedures.
The first step is as follows: measuring the length and the area of an electric branch of the crosslinked polyethylene cable;
applying 30kV power frequency alternating current voltage to the manufactured 10kV crosslinked polyethylene cable sample to carry out an electrical aging experiment, wherein the aging time is 0, 24, 48, 72, … and 2400 hours, and taking the aged cable as a characteristic sample; performing core-pulling slicing treatment on the cable, and then putting the cable into a vessel containing silicone oil to be measured by a real-time microscopic digital camera system; the length of the electric tree of the characteristic sample is recorded as L1、L2、…LnIn units of μm. Measuring and calculating the ratio of the electrical branch area of the characteristic sample to the section area of the measured characteristic sample and recording as S1、S2、…SnFinally, measuring the length L of the electrical tree of the sample to be evaluated, and the ratio S of the area of the electrical tree of the sample to be evaluated to the area of the slice of the sample to be evaluated;
the second step is that: measuring the tangent value of the dielectric loss angle of the sample cable by a penicillin bridge method, and recording the tangent value as TD1、TD2、TD3、…TDn；
The third step: and (3) calculating the electrical tree coefficient alpha of the aged cable, wherein the calculation process is as follows:
Figure BDA0003339560330000031
wherein L is the length of the electrical branch of the cable to be evaluated, and S is the ratio of the area of the electrical branch of the cable to be evaluated to the test area of the electrical branch;
the fourth step: calculating the dielectric loss factor beta according to the following calculation process:
Figure BDA0003339560330000032
wherein TD is the dielectric loss tangent of the cable to be evaluated, TDmaxIs the maximum dielectric loss tangent, TD, of the characteristic sampleminThe minimum dielectric loss tangent value in the characteristic sample is taken;
the fifth step: calculating the electric tree state evaluation factor gamma according to the following steps:
Figure BDA0003339560330000033
and a sixth step: determining the aging state of the cable by the electrical tree state evaluation factor gamma, and performing the following evaluation:
if gamma is less than 2.36, the insulation of the target crosslinked polyethylene cable is slightly aged;
if gamma is more than or equal to 2.36 and less than 4.29, the insulation of the target crosslinked polyethylene cable is moderately aged;
if gamma is not less than 4.29, the insulation of the target crosslinked polyethylene cable is severely aged.

Claims (1)

1. A10 kV XLPE cable aging state evaluation method based on an electrical tree state evaluation factor is characterized by comprising the following steps:
step 1: carrying out electrical aging treatment on the newly manufactured 10kV crosslinked polyethylene cable for 0, 24, 48, 72, … and t hours, taking the aged cable as a characteristic sample, and determining the t element to be [24,24n ]]N is 100; performing core-pulling slicing treatment on the cable, and then putting the cable into a vessel containing silicone oil to be measured by a real-time microscopic digital camera system; the length of the electric tree of the characteristic sample is recorded as L1、L2、…LnIn units of μm. The ratio of the area of the electrical tree to the area of the measured characteristic sample is recorded as S1、S2、…SnFinally, measuring the ratio S of the length L of the electric tree to the area of the sample to be evaluated;
step 2: and (3) calculating the electrical tree coefficient alpha of the aged cable, wherein the calculation process is as follows:
Figure FDA0003339560320000011
wherein L is the length of the electrical branch of the cable to be evaluated, and S is the ratio of the area of the electrical branch of the cable to be evaluated to the test area of the electrical branch;
and step 3: measuring the tangent value of the dielectric loss angle of the characteristic cable by a penicillin bridge method, and recording the tangent value as TD1、TD2、TD3、…TDnMeasuring the tangent value of the dielectric loss angle of the sample cable to be evaluated, and recording the tangent value as TD;
and 4, step 4: calculating the dielectric loss factor beta according to the following calculation process:
Figure FDA0003339560320000012
wherein TD is the dielectric loss tangent of the cable to be evaluated, TDmaxIs the maximum dielectric loss tangent, TD, of the characteristic sampleminThe minimum dielectric loss tangent value in the characteristic sample is taken;
and 5: calculating the electric tree state evaluation factor gamma according to the following steps:
Figure FDA0003339560320000013
step 6: and determining the cable aging state through the electrical tree state evaluation factor gamma.
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN116106657A (en) * 2022-11-18 2023-05-12 西南交通大学 Method for evaluating ageing state of EPDM (ethylene-propylene-diene monomer) cable based on electron trap effect

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JP2016042046A (en) * 2014-08-15 2016-03-31 三宝電機株式会社 Dielectric loss tangent measurement device and method thereof, and power cable diagnosis device and method thereof
CN112557842A (en) * 2020-11-24 2021-03-26 西南交通大学 XLPE cable aging state evaluation method based on dielectric constant evaluation factor
CN112557843A (en) * 2020-11-24 2021-03-26 西南交通大学 Method for evaluating aging degree of XLPE cable insulation layer water tree
CN113064002A (en) * 2021-03-16 2021-07-02 重庆大学 Method for evaluating insulation aging state of 10kV XLPE cable
EP3896468A1 (en) * 2019-11-19 2021-10-20 Lincang Power Supply Bureau Yunnan Power Grid Co., Ltd. Platform for testing leakage current difference factor of aged xlpe cable, and method

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Publication number Priority date Publication date Assignee Title
JP2016042046A (en) * 2014-08-15 2016-03-31 三宝電機株式会社 Dielectric loss tangent measurement device and method thereof, and power cable diagnosis device and method thereof
EP3896468A1 (en) * 2019-11-19 2021-10-20 Lincang Power Supply Bureau Yunnan Power Grid Co., Ltd. Platform for testing leakage current difference factor of aged xlpe cable, and method
CN112557842A (en) * 2020-11-24 2021-03-26 西南交通大学 XLPE cable aging state evaluation method based on dielectric constant evaluation factor
CN112557843A (en) * 2020-11-24 2021-03-26 西南交通大学 Method for evaluating aging degree of XLPE cable insulation layer water tree
CN113064002A (en) * 2021-03-16 2021-07-02 重庆大学 Method for evaluating insulation aging state of 10kV XLPE cable

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116106657A (en) * 2022-11-18 2023-05-12 西南交通大学 Method for evaluating ageing state of EPDM (ethylene-propylene-diene monomer) cable based on electron trap effect
CN116106657B (en) * 2022-11-18 2024-03-19 西南交通大学 Method for evaluating ageing state of EPDM (ethylene-propylene-diene monomer) cable based on electron trap effect

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