CN110632480A - 10kV XLPE cable insulation aging state evaluation method - Google Patents

10kV XLPE cable insulation aging state evaluation method Download PDF

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CN110632480A
CN110632480A CN201911062587.8A CN201911062587A CN110632480A CN 110632480 A CN110632480 A CN 110632480A CN 201911062587 A CN201911062587 A CN 201911062587A CN 110632480 A CN110632480 A CN 110632480A
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CN110632480B (en
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郭蕾
李丽妮
王冲
张靖康
杨涵
曹伟东
邢立勐
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Southwest Jiaotong University
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    • 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 XLPE cable insulation aging state evaluation method, which comprises the following steps: 1) carrying out partial discharge test on the 10kV XLPE cable; 2) the whole testing process is divided into stages; 3) respectively calculating improved normalized coefficients of the maximum discharge capacity of each stage; 4) calculating an aging state factor; 5) and evaluating the insulation aging state of the test cable by using the aging state factor. The invention has the beneficial effects that: (1) different characteristic quantities represented at different stages in the test process are effectively extracted, so that the evaluation method is more accurate; (2) and extracting characteristic parameters according to the partial discharge information, calculating an aging state factor, and more effectively evaluating the insulation aging state of the XLPE cable.

Description

10kV XLPE cable insulation aging state evaluation method
Technical Field
The invention belongs to the field of power distribution network cable insulation faults, and particularly relates to a 10kV XLPE cable insulation aging state assessment method.
Background
The 10kV cable is used as an important component of the power distribution network, plays a key role in transmitting electric energy, and directly influences the effective operation of a power transmission system and electric equipment due to the advantages and disadvantages of the electric insulation performance, thereby being related to the reliability of the power distribution network. The insulation state of the 10kV XLPE cable is influenced along with factors such as service life, operation environment and the like, so that the research on the evaluation method of the insulation aging state of the 10kV XLPE cable is of great significance.
At present, a fault insulation state evaluation method for a 10kV XLPE cable mainly tests a partial discharge spectrogram of the cable, but the insulation state of the cable is directly represented inaccurately by obtaining basic information of the discharge spectrogram, so that a method for reliably and effectively deeply evaluating the insulation aging state of the 10kV XLPE cable according to the partial discharge spectrogram information is urgently needed.
Disclosure of Invention
The invention aims to provide a 10kV XLPE cable insulation aging state evaluation method.
The technical scheme for realizing the purpose of the invention is as follows:
a10 kV XLPE cable insulation aging state assessment method comprises
Step 1: partial discharge testing was performed on 10kV XLPE cables:
pressurizing 10kV XLPE cable by using a step boosting method, boosting step by using a gradient of 0.5kV, and acquiring phase-discharge capacity data after constant voltage maintenance under each step of voltage
Figure BDA0002258428940000013
Until the voltage is increased to 10 kV;
step 2: the whole testing process is divided into stages,
Figure BDA0002258428940000011
wherein D ═ 1 is the 1 st stage of the test, D ═ 2 is the 2 nd stage of the test, D ═ 3 is the 3 rd stage of the test, and D ═ 4 is the 4 th stage of the test;
and step 3: respectively calculating improved normalized coefficient Z of maximum discharge quantity of each stageiComprises that
3.1 calculate the discharge amount difference a at each phase tested at each level of voltage in each phasei,j,n：
Figure BDA0002258428940000012
Wherein i represents the ith stage, j represents the jth stage voltage in the ith stage, and j is equal to [1,5 ]](ii) a n represents the phase-discharge data collected at each level of voltage
Figure BDA0002258428940000021
N is the nth phase in (1, 360)]N is an integer; q. q.si,j,nPhase data of discharge quantity representing j stage voltage collection in i stageThe discharge amount at the nth phase; q. q.si,j,minPhase data of discharge quantity collected under j stage voltage in i stage
Figure BDA0002258428940000023
The minimum discharge amount;
3.2 calculate the maximum discharge specification factor b for each test in each stagei,j：
Figure BDA0002258428940000024
In the formula, ai,j,maxRepresenting the maximum discharge quantity gap at the j level voltage in the ith stage;
3.3 calculating the normalized coefficient of maximum discharge Z in each stagei：
Figure BDA0002258428940000025
And 4, step 4: the aging-state factor epsilon is calculated,
in the formula, Z1，Z2，Z3，Z4Improved normalization coefficients of the maximum discharge amounts in the 1 st to 4 th test stages, respectively;
and 5: the aging state factor epsilon is used to evaluate the insulation aging state of the test cable.
The invention has the beneficial effects that:
(1) different characteristic quantities represented at different stages in the test process are effectively extracted, so that the evaluation method is more accurate;
(2) and extracting characteristic parameters according to the partial discharge information, calculating an aging state factor, and more effectively evaluating the insulation aging state of the XLPE cable.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The present invention is further described below.
Fig. 1 is a flow chart of a 10kV XLPE cable insulation state evaluation method based on improved normalization, which includes the following steps:
step 1: partial discharge test of 10kV XLPE cable
Pressurizing 10kV XLPE cable by using a step boosting method, boosting step by using a gradient of 0.5kV, keeping constant voltage for 10min under each voltage level, and acquiring phase-discharge capacity data under each voltage level
Figure BDA0002258428940000027
Boosting the voltage to 10 kV;
step 2: the whole test process is divided into stages
That is, when D is 1, the applied voltage is 0.5kV to 2.5kV, which is the S1 stage of the test; when D is 2, the applied voltage is 3.0kV to 5.0kV, which is the S2 th stage of the test; when D is 3, the applied voltage is 5.5kV to 7.5kV, which is the S3 th stage of the test; when D is 4, the applied voltage is 8.0kV to 10.0kV, which is the S4 th stage of the test;
and step 3: calculating improved normalization coefficients Z of maximum discharge amounts in S1, S2, S3 and S4 stages respectivelyi
3.1 calculate the discharge amount difference a at each phase tested at each level of voltage in each phasei,j,n：
Figure BDA0002258428940000032
Wherein i represents the ith stage divided in step 2, i ∈ [1,4 ]]I is an integer; j represents the j stage voltage in the ith stage, j ∈ [1,5 ]]J is an integer; n represents the phase-discharge data collected at each level of voltage
Figure BDA0002258428940000033
N is the nth phase in (1, 360)]N is an integer; q. q.si,j,nPhase data of discharge quantity representing j stage voltage collection in i stage
Figure BDA0002258428940000034
The discharge amount at the nth phase; q. q.si,j,minPhase data of discharge quantity collected under j stage voltage in i stage
Figure BDA0002258428940000035
Figure BDA0002258428940000036
The minimum discharge amount;
3.2 calculate the maximum discharge specification factor b for each test in each stagei,j：
Figure BDA0002258428940000037
Wherein i represents a stepThe ith stage divided in step 2, i ∈ [1,4 ]]I is an integer; j represents the j stage voltage in the ith stage, j ∈ [1,5 ]]J is an integer; n represents the phase of the discharge quantity collected under each level of voltage
Figure BDA0002258428940000038
The nth phase in the data, n ∈ [1,360 ]]N is an integer; a isi,j,nRepresenting the difference of the discharge amount of the nth phase in the j stage voltage in the ith stage in 3.1; a isi,j,maxRepresenting the maximum discharge quantity gap at the j level voltage in the ith stage;
3.3 calculating the normalized coefficient of maximum discharge Z in each stagei
Figure BDA0002258428940000039
Wherein i represents the ith stage divided in step 2, i ∈ [1,4 ]]I is an integer, and the improved normalization coefficient of the maximum discharge amount in the stage S1 is Z1And the improved normalization coefficient of the maximum discharge amount at the S2 stage is Z2The improved normalization coefficient of the maximum discharge amount at the stage S3 is Z3The improved normalization coefficient of the maximum discharge amount at the stage S4 is Z4(ii) a j represents the j stage voltage in the ith stage, j ∈ [1,5 ]]J is an integer; bi,jThe specification factor of the maximum discharge capacity at the j level voltage in the ith stage in 3.2;
and 4, step 4: calculating an aging state factor
Figure BDA0002258428940000041
In the formula, Z1，Z2，Z3，Z4A modified normalization factor for the maximum discharge in each stage in 3.3;
and 5: XLPE cable insulation aging state assessment
When the epsilon is more than 5.6, the 10kV XLPE cable is seriously aged;
when epsilon is less than 5.6, the aging state of the 10kV XLPE cable is in an acceptable range, and the cable can still run safely.

Claims (1)

1. A10 kV XLPE cable insulation aging state assessment method is characterized by comprising
Step 1: partial discharge testing was performed on 10kV XLPE cables:
pressurizing 10kV XLPE cable by using a step boosting method, boosting step by using a gradient of 0.5kV, and acquiring phase-discharge capacity data after constant voltage maintenance under each step of voltageUntil the voltage is increased to 10 kV;
step 2: the whole testing process is divided into stages,
Figure FDA0002258428930000012
wherein D ═ 1 is the 1 st stage of the test, D ═ 2 is the 2 nd stage of the test, D ═ 3 is the 3 rd stage of the test, and D ═ 4 is the 4 th stage of the test;
and step 3: respectively calculating improved normalized coefficient Z of maximum discharge quantity of each stageiComprises that
3.1 calculate the discharge amount difference a at each phase tested at each level of voltage in each phasei,j,n：
Wherein i represents the ith stage, j represents the jth stage voltage in the ith stage, and j is equal to [1,5 ]](ii) a n represents the phase-discharge data collected at each level of voltage
Figure FDA0002258428930000014
N is the nth phase in (1, 360)]N is an integer; q. q.si,j,nPhase data of discharge quantity representing j stage voltage collection in i stage
Figure FDA0002258428930000015
The discharge amount at the nth phase; q. q.si,j,minPhase data of discharge quantity collected under j stage voltage in i stage
Figure FDA0002258428930000016
The minimum discharge amount;
3.2 calculate the maximum discharge specification factor b for each test in each stagei,j：
Figure FDA0002258428930000017
In the formula, ai,j,maxRepresenting the maximum discharge quantity gap at the j level voltage in the ith stage;
3.3 calculating the normalized coefficient of maximum discharge Z in each stagei：
Figure FDA0002258428930000018
And 4, step 4: the aging-state factor epsilon is calculated,
Figure FDA0002258428930000019
in the formula, Z1，Z2，Z3，Z4Improved normalization coefficients of the maximum discharge amounts in the 1 st to 4 th test stages, respectively;
and 5: the aging state factor epsilon is used to evaluate the insulation aging state of the test cable.
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CN113189455A (en) * 2021-04-02 2021-07-30 广东工业大学 Motor train unit high-voltage cable defect degree evaluation method based on local discharge amount difference
CN113625136A (en) * 2021-08-10 2021-11-09 国网福建省电力有限公司漳州供电公司 Power distribution network 6kV cable aging state evaluation method based on multi-stage discharge coefficients
CN114113790A (en) * 2021-11-29 2022-03-01 云南电网有限责任公司电力科学研究院 Multi-parameter cable insulation state diagnosis method and device based on electric charge quantity
CN114166890A (en) * 2021-11-05 2022-03-11 西南交通大学 Method for estimating running age of vehicle-mounted EPR cable
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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Publication number Priority date Publication date Assignee Title
CN113189455A (en) * 2021-04-02 2021-07-30 广东工业大学 Motor train unit high-voltage cable defect degree evaluation method based on local discharge amount difference
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CN113625136A (en) * 2021-08-10 2021-11-09 国网福建省电力有限公司漳州供电公司 Power distribution network 6kV cable aging state evaluation method based on multi-stage discharge coefficients
CN113625136B (en) * 2021-08-10 2023-10-31 国网福建省电力有限公司漳州供电公司 Multi-stage discharge coefficient-based power distribution network 6kV cable aging state evaluation method
CN114166890A (en) * 2021-11-05 2022-03-11 西南交通大学 Method for estimating running age of vehicle-mounted EPR cable
CN114113790A (en) * 2021-11-29 2022-03-01 云南电网有限责任公司电力科学研究院 Multi-parameter cable insulation state diagnosis method and device based on electric charge quantity
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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