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CN110632480B - A 10kV XLPE cable insulation aging state assessment method - Google Patents

A 10kV XLPE cable insulation aging state assessment method Download PDF

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CN110632480B
CN110632480B CN201911062587.8A CN201911062587A CN110632480B CN 110632480 B CN110632480 B CN 110632480B CN 201911062587 A CN201911062587 A CN 201911062587A CN 110632480 B CN110632480 B CN 110632480B
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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

本发明公开了一种10kV XLPE电缆绝缘老化状态评估方法，包括步骤：1)对10kV XLPE电缆进行局部放电测试；2)对整个测试过程进行阶段划分；3)分别计算各个阶段最大放电量的改进型规范化系数；4)计算老化状态因子；5)使用老化状态因子对测试电缆绝缘老化状态进行评估。本发明的有益效果在于：(1)有效提取测试过程中不同阶段表征的不同特征量，使评估方法更准确；(2)根据局部放电信息，提取特征参量，计算老化状态因子，更为有效地评估XLPE电缆绝缘老化状态。

Figure 201911062587

The invention discloses a method for evaluating the insulation aging state of a 10kV XLPE cable. 4) Calculate the aging state factor; 5) Use the aging state factor to evaluate the aging state of the insulation of the test cable. The beneficial effects of the present invention are: (1) effectively extracting different characteristic quantities represented at different stages in the testing process, so that the evaluation method is more accurate; (2) extracting characteristic parameters according to partial discharge information, and calculating the aging state factor, more effectively Assess the aging state of XLPE cable insulation.

Figure 201911062587

Description

一种10kV XLPE电缆绝缘老化状态评估方法A 10kV XLPE cable insulation aging state assessment method

技术领域technical field

本发明属于配电网电缆绝缘故障领域，具体涉及一种10kV XLPE电缆绝缘老化状态评估方法。The invention belongs to the field of power distribution network cable insulation faults, and in particular relates to a method for evaluating the insulation aging state of 10kV XLPE cables.

背景技术Background technique

10kV电缆作为配电网的重要组成部分，承担了传输电能的关键作用，其电气绝缘性能的优劣，直接影响了输电系统和用电设备的有效运行，关系到配电网的可靠性。10kV电缆随着使用年限及运行环境等因素，其绝缘状态将受到影响，因此研究10kV XLPE电缆绝缘老化状态评估方法，具有重大意义。As an important part of the distribution network, the 10kV cable plays a key role in transmitting electric energy. The quality of its electrical insulation performance directly affects the effective operation of the transmission system and electrical equipment, and is related to the reliability of the distribution network. The insulation state of 10kV cables will be affected with factors such as service life and operating environment. Therefore, it is of great significance to study the evaluation method of insulation aging state of 10kV XLPE cables.

目前，针对10kV XLPE电缆的故障绝缘状态评估方法主要是通过测试电缆的局部放电谱图，但是通过获取放电谱图的基本信息来直接表征电缆的绝缘状态并不准确，因此急需一种能够根据局部放电谱图信息，可靠、有效的深入评估10kV XLPE电缆绝缘老化状态的方法。At present, the fault insulation state evaluation method for 10kV XLPE cables is mainly by testing the partial discharge spectrum of the cable, but it is not accurate to directly characterize the insulation state of the cable by obtaining the basic information of the discharge spectrum. Discharge spectrum information, a reliable and effective method for in-depth evaluation of 10kV XLPE cable insulation aging state.

发明内容SUMMARY OF THE INVENTION

本发明的目的是提供一种10kV XLPE电缆绝缘老化状态评估方法。The purpose of the present invention is to provide a method for evaluating the insulation aging state of a 10kV XLPE cable.

实现本发明目的的技术方案如下：The technical scheme that realizes the object of the present invention is as follows:

一种10kV XLPE电缆绝缘老化状态评估方法，包括A 10kV XLPE cable insulation aging state assessment method, including

步骤1：对10kV XLPE电缆进行局部放电测试：Step 1: Partial discharge test on 10kV XLPE cable:

利用阶梯升压法对10kV XLPE电缆加压，以0.5kV的梯度逐级升压，在每级电压下恒压保持后采集相位-放电量数据

Figure GDA0002628558720000011
直到升压至10kV；The 10kV XLPE cable is pressurized by the step-up method, and the voltage is stepped up with a gradient of 0.5kV, and the phase-discharge data is collected after the constant voltage is maintained at each level of voltage.
Figure GDA0002628558720000011
until boosted to 10kV;

步骤2：对整个测试过程进行阶段划分，Step 2: Stage the entire testing process,

Figure GDA0002628558720000012
Figure GDA0002628558720000012

其中，D＝1为测试的第1个阶段，D＝2为测试的第2个阶段，D＝3为测试的第3个阶段，D＝4为测试的第4个阶段；Wherein, D=1 is the first stage of the test, D=2 is the second stage of the test, D=3 is the third stage of the test, and D=4 is the fourth stage of the test;

步骤3：分别计算各个阶段最大放电量的改进型规范化系数Zi，包括Step 3: Calculate the improved normalized coefficient Z i of the maximum discharge capacity of each stage, including

3.1计算每个阶段中每级电压下测试的每个相位下的放电量差距ai,j,n：3.1 Calculate the discharge volume difference a i,j,n under each phase tested at each voltage level in each phase:

Figure GDA0002628558720000013
Figure GDA0002628558720000013

式中，i表示第i个阶段，j表示第i个阶段内的第j级电压，j∈[1,5]；n表示每级电压下采集的相位-放电量数据

Figure GDA0002628558720000021
中的第n个相位，n∈[1,360]，n为整数；qi,j,n表示第i个阶段内的第j级电压采集的放电量相位数据
Figure GDA0002628558720000022
中第n个相位下的放电量；qi,j,min表示第i个阶段内的第j级电压下采集的放电量相位数据
Figure GDA0002628558720000023
中最小的放电量；In the formula, i represents the ith stage, j represents the jth level voltage in the ith stage, j∈[1,5]; n represents the phase-discharge amount data collected at each level of voltage
Figure GDA0002628558720000021
The nth phase in , n∈[1,360], n is an integer; q i,j,n represents the phase data of the discharge amount collected by the jth voltage in the ith phase
Figure GDA0002628558720000022
The discharge amount under the nth phase in the
Figure GDA0002628558720000023
The smallest discharge in the

3.2计算每个阶段中每次测试的最大放电量规范因子bi,j：3.2 Calculate the maximum discharge specification factor b i,j for each test in each stage:

Figure GDA0002628558720000024
Figure GDA0002628558720000024

式中，ai,j,max表示第i个阶段内的第j级电压下的最大放电量差距；In the formula, a i,j,max represents the maximum discharge amount difference under the jth level voltage in the ith stage;

3.3计算每个阶段中最大放电量的改进型规范化系数Zi：3.3 Calculate the modified normalization coefficient Z i of the maximum discharge in each stage:

Figure GDA0002628558720000025
Figure GDA0002628558720000025

步骤4：计算老化状态因子ε，Step 4: Calculate the aging state factor ε,

Figure GDA0002628558720000026
Figure GDA0002628558720000026

式中，Z1，Z2，Z3，Z4分别为第1个至第4个测试阶段中最大放电量的改进型规范化系数；In the formula, Z 1 , Z 2 , Z 3 , and Z 4 are the modified normalization coefficients of the maximum discharge capacity in the first to fourth test stages, respectively;

步骤5：使用老化状态因子ε对测试电缆绝缘老化状态进行评估。Step 5: Use the aging state factor ε to evaluate the aging state of the insulation of the test cable.

本发明的有益效果在于：The beneficial effects of the present invention are:

(1)有效提取测试过程中不同阶段表征的不同特征量，使评估方法更准确；(1) Effectively extract different feature quantities represented at different stages in the testing process, making the evaluation method more accurate;

(2)根据局部放电信息，提取特征参量，计算老化状态因子，更为有效地评估XLPE电缆绝缘老化状态。(2) According to the partial discharge information, extract characteristic parameters, calculate the aging state factor, and more effectively evaluate the aging state of XLPE cable insulation.

附图说明Description of drawings

图1是本发明的流程图。Figure 1 is a flow chart of the present invention.

具体实施方式Detailed ways

下面对本发明作进一步的说明。The present invention will be further described below.

图1为基于改进型规范化的10kV XLPE电缆绝缘状态评估方法流程图，包括如下步骤：步骤1：对10kV XLPE电缆进行局部放电测试Figure 1 is a flow chart of the method for evaluating the insulation status of 10kV XLPE cables based on the improved standardization, including the following steps: Step 1: Partial discharge test for 10kV XLPE cables

利用阶梯升压法对10kV XLPE电缆加压，以0.5kV的梯度逐级升压，在各级电压下恒压保持10min，每级电压下采集相位-放电量数据

Figure GDA0002628558720000027
升压至10kV；The 10kV XLPE cable is pressurized by the step-up method, and the voltage is increased step by step with a gradient of 0.5kV. The constant voltage is maintained for 10min at each level of voltage, and the phase-discharge data is collected at each level of voltage.
Figure GDA0002628558720000027
Boost to 10kV;

步骤2：对整个测试过程进行阶段划分Step 2: Stage the entire testing process

Figure GDA0002628558720000031
Figure GDA0002628558720000031

即当D＝1时，施加电压为0.5kV至2.5kV，为测试的S1阶段；当D＝2时，施加电压为3.0kV至5.0kV，为测试的第S2阶段；当D＝3时，施加电压为5.5kV至7.5kV，为测试的第S3阶段；当D＝4时施加电压为8.0kV至10.0kV，为测试的第S4阶段；That is, when D=1, the applied voltage is 0.5kV to 2.5kV, which is the S1 stage of the test; when D=2, the applied voltage is 3.0kV to 5.0kV, which is the S2 stage of the test; when D=3, The applied voltage is 5.5kV to 7.5kV, which is the S3 stage of the test; when D=4, the applied voltage is 8.0kV to 10.0kV, which is the S4 stage of the test;

步骤3：分别计算S1、S2、S3、S4阶段最大放电量的改进型规范化系数Zi Step 3: Calculate the improved normalization coefficient Z i of the maximum discharge capacity in stages S1, S2, S3, and S4 respectively

3.1计算每个阶段中每级电压下测试的每个相位下的放电量差距ai,j,n：3.1 Calculate the discharge volume difference a i,j,n under each phase tested at each voltage level in each phase:

Figure GDA0002628558720000032
Figure GDA0002628558720000032

式中，i表示步骤2中划分的第i个阶段，i∈[1,4]，i为整数；j表示第i个阶段内的第j级电压，j∈[1,5]，j为整数；n表示每级电压下采集的相位-放电量数据

Figure GDA0002628558720000033
中的第n个相位，n∈[1,360]，n为整数；qi,j,n表示第i个阶段内的第j级电压采集的放电量相位数据
Figure GDA0002628558720000034
中第n个相位下的放电量；qi,j,min表示第i个阶段内的第j级电压下采集的放电量相位数据
Figure GDA0002628558720000035
Figure GDA0002628558720000036
中最小的放电量；In the formula, i represents the ith stage divided in step 2, i∈[1,4], i is an integer; j represents the jth level voltage in the ith stage, j∈[1,5], j is Integer; n represents the phase-discharge data collected at each level of voltage
Figure GDA0002628558720000033
The nth phase in , n∈[1,360], n is an integer; q i,j,n represents the phase data of the discharge amount collected by the jth voltage in the ith phase
Figure GDA0002628558720000034
The discharge amount under the nth phase in the
Figure GDA0002628558720000035
Figure GDA0002628558720000036
The smallest discharge in the

3.2计算每个阶段中每次测试里最大放电量规范因子bi,j：3.2 Calculate the maximum discharge specification factor b i,j for each test in each stage:

Figure GDA0002628558720000037
Figure GDA0002628558720000037

式中，i表示步骤2中划分的第i个阶段，i∈[1,4]，i为整数；j表示第i个阶段内的第j级电压，j∈[1,5]，j为整数；n表示每级电压下采集的放电量相位数据

Figure GDA0002628558720000038
中的第n个相位，n∈[1,360]，n为整数；ai,j,n表示3.1中的第i个阶段内的第j级电压中第n个相位下的放电量差距；ai,j,max表示第i个阶段内的第j级电压下的最大放电量差距；In the formula, i represents the ith stage divided in step 2, i∈[1,4], i is an integer; j represents the jth level voltage in the ith stage, j∈[1,5], j is Integer; n represents the phase data of discharge volume collected at each voltage level
Figure GDA0002628558720000038
The nth phase in , n∈[1,360], n is an integer; a i,j,n represent the discharge amount difference under the nth phase in the jth level voltage in the ith phase in 3.1; a i ,j,max represents the maximum discharge gap under the jth level voltage in the ith stage;

3.3计算每个阶段中最大放电量的改进型规范化系数Zi 3.3 Calculate the modified normalization coefficient Z i of the maximum discharge in each stage

Figure GDA0002628558720000039
Figure GDA0002628558720000039

式中，i表示步骤2中划分的第i个阶段，i∈[1,4]，i为整数，记S1阶段的最大放电量的改进型规范化系数为Z1，S2阶段的最大放电量的改进型规范化系数为Z2，记S3阶段的最大放电量的改进型规范化系数为Z3，记S4阶段的最大放电量的改进型规范化系数为Z4；j表示第i个阶段内的第j级电压，j∈[1,5]，j为整数；bi,j为3.2中的第i个阶段内的第j级电压下的最大放电量规范因子；In the formula, 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 S1 stage is Z 1 , and the maximum discharge amount in the S2 stage is The improved normalization coefficient is Z 2 , the improved normalization coefficient of the maximum discharge amount in the S3 stage is Z 3 , and the improved normalization coefficient of the maximum discharge amount in the S4 stage is Z 4 ; j represents the jth in the ith stage stage voltage, j∈[1,5], j is an integer; b i,j is the maximum discharge specification factor under the jth stage voltage in the ith stage in 3.2;

步骤4：计算老化状态因子Step 4: Calculate the aging state factor

Figure GDA0002628558720000041
Figure GDA0002628558720000041

式中，Z1，Z2，Z3，Z4为3.3中的每个阶段中最大放电量的改进型规范化系数；In the formula, Z 1 , Z 2 , Z 3 , and Z 4 are the improved normalization coefficients of the maximum discharge capacity in each stage in 3.3;

步骤5：XLPE电缆绝缘老化状态评估Step 5: Assessment of XLPE Cable Insulation Aging Status

当ε>5.6时，10kV XLPE电缆老化严重；When ε>5.6, the aging of 10kV XLPE cable is serious;

当ε<5.6时，10kV XLPE电缆老化状态为可接受范围，仍能继续安全运行。When ε<5.6, the aging state of 10kV XLPE cable is acceptable, and it can continue to operate 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 voltage
Figure FDA0002258428930000011
Until 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：
Figure FDA0002258428930000013
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 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: and evaluating the insulation aging state of the test cable by using the aging state factor.
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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113189455B (en) * 2021-04-02 2022-05-17 广东工业大学 A method for evaluating the defect degree of EMU high-voltage cables based on the difference of partial discharge
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 A method to evaluate the aging status of 6kV cables in distribution network based on multi-level discharge coefficient
CN114166890B (en) * 2021-11-05 2022-07-19 西南交通大学 A method for estimating the operating age of vehicle-mounted EPR cables
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
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

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970924A (en) * 1971-08-09 1976-07-20 Anaconda Wire & Cable Company Apparatus for detecting faults in magnet wire insulation without thermally damaging the insulation and which does not respond to impedance indications above a predetermined threshold value
DE10125910B4 (en) * 2000-05-30 2007-02-01 International Rectifier Corp., El Segundo Method and circuit for detecting motor insulation faults
CN101666850A (en) * 2009-09-29 2010-03-10 延安供电局 Acoustic-electric detection device for insulation defects of power cable
CN102508036B (en) * 2011-11-02 2014-07-16 浙江大学城市学院 On-line remote monitoring method and device for pollution state of disk insulator
CN103105566B (en) * 2013-01-14 2014-07-16 江苏省电力公司电力科学研究院 Oil paper insulation electrical equipment aging state detection method based on universal relaxation law
US11204274B2 (en) * 2016-03-31 2021-12-21 United States Of America As Represented By The Administrator Of Nasa Ultraviolet sensing apparatus with mirror amplification
JP6740844B2 (en) * 2016-10-05 2020-08-19 株式会社デンソー Battery resistance calculator
CN107192928B (en) * 2017-05-29 2019-07-12 西南交通大学 Experimental device for insulation aging of vehicle-mounted cables with frequent changes in operating ambient temperature
CN107505542A (en) * 2017-07-25 2017-12-22 上海电力学院 Measuring method based on depolarization current method detection XLPE cable degree of aging
CN109272257A (en) * 2018-11-02 2019-01-25 国网山西省电力公司电力科学研究院 A kind of electric cable stoppage appraisal procedure and system based on higher hamonic wave database
CN110286303A (en) * 2019-07-10 2019-09-27 国家电网有限公司 A method for evaluating the insulation aging state of coaxial cable based on BP neural network

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