CN112946431B - Evaluation method for insulation thermal aging of vehicle-mounted cable based on polarization detection - Google Patents
Evaluation method for insulation thermal aging of vehicle-mounted cable based on polarization detection Download PDFInfo
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- CN112946431B CN112946431B CN202110113879.0A CN202110113879A CN112946431B CN 112946431 B CN112946431 B CN 112946431B CN 202110113879 A CN202110113879 A CN 202110113879A CN 112946431 B CN112946431 B CN 112946431B
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- 230000010287 polarization Effects 0.000 title claims abstract description 56
- 238000003878 thermal aging Methods 0.000 title claims abstract description 42
- 238000009413 insulation Methods 0.000 title claims abstract description 39
- 238000001514 detection method Methods 0.000 title claims abstract description 13
- 238000011156 evaluation Methods 0.000 title claims description 7
- 230000032683 aging Effects 0.000 claims abstract description 38
- 238000004088 simulation Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
-
- 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
- G01R31/003—Environmental or reliability tests
Abstract
The invention discloses a method for evaluating insulation thermal aging of a vehicle-mounted cable based on polarization detection, which comprises the following steps: s1, carrying out insulation thermal aging simulation on the vehicle-mounted cable test sample; s2, carrying out a polarization current test on the vehicle-mounted cable test sample to obtain a polarization current value; s3, calculating the polarization factor of the vehicle-mounted cable test sample; s4, conducting dielectric loss test on the vehicle-mounted cable test sample to obtain the real part, the imaginary part and the dielectric loss angle tangent value of the complex dielectric constant; s5, calculating the dielectric loss factor of the vehicle-mounted cable test sample; s6, calculating the aging factor of the vehicle-mounted cable test sample; and S7, detecting the insulation aging degree of the vehicle-mounted cable test sample. The invention can effectively and conveniently evaluate the insulation thermal aging degree of the vehicle-mounted cable.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted cable insulation aging detection, in particular to a method for evaluating vehicle-mounted cable insulation thermal aging based on polarization detection.
Background
The vehicle-mounted cable is an important part of an electric traction system of the motor train unit, and the vehicle-mounted cable in long-term operation is gradually aged due to the influence of various factors such as electricity, heat and dampness. The main factors influencing the thermal aging degree of the vehicle-mounted cable are temperature and aging time, and the increase of the temperature and the aging time can cause the aging degree of the cable to be more serious and seriously influence the safe operation of the motor train unit.
Therefore, a method for evaluating insulation thermal aging of a vehicle-mounted cable is needed to grasp the degree of insulation thermal aging of the vehicle-mounted cable and reduce economic loss caused by cable failure.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an effective and convenient evaluation method for the insulation thermal aging of a vehicle-mounted cable based on polarization detection.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a method for evaluating insulation thermal aging of a vehicle-mounted cable based on polarization detection comprises the following steps:
s1, carrying out insulation thermal aging simulation on the vehicle-mounted cable test sample;
s2, carrying out a polarization current test on the vehicle-mounted cable test sample to obtain a polarization current value;
s3, calculating the polarization factor of the vehicle-mounted cable test sample;
s4, conducting dielectric loss test on the vehicle-mounted cable test sample to obtain the real part, the imaginary part and the dielectric loss angle tangent value of the complex dielectric constant;
s5, calculating the dielectric loss factor of the vehicle-mounted cable test sample;
s6, calculating the aging factor of the vehicle-mounted cable test sample;
and S7, detecting the insulation aging degree of the vehicle-mounted cable test sample.
Further, the step S1 of performing insulation thermal aging simulation on the vehicle-mounted cable test sample specifically includes: the method comprises the steps of manufacturing a vehicle-mounted cable thermal aging test sample, placing the vehicle-mounted cable test sample in an aging box with an aging temperature of T for T hours, and carrying out thermal aging simulation by means of T e {72n | (n is 1, 2., 10 }.
Further, when the step S2 performs the polarization current test on the vehicle-mounted cable test sample to obtain the polarization current value, the polarization current test is first performed on the vehicle-mounted cable test sample which is not subjected to thermal aging, and the polarization current value I which is not subjected to thermal aging is obtained p0 Then, carrying out a polarization current test on the vehicle-mounted cable test sample subjected to thermal aging for t hours to obtain a polarization current value I subjected to thermal aging pi ，i＝1,2,...,n。
Further, the calculation formula of the polarization factor of the vehicle-mounted cable test sample in the step S3 is as follows:
wherein α is a polarization factorS is the cross section area of the insulating layer of the vehicle-mounted cable test sample, L is the length of the vehicle-mounted cable test sample, T is the thermal aging temperature, T is the thermal aging time, I p0 A value of polarization current without heat aging pi For the thermally aged polarization current values, i is 1, 2.
Further, the formula for calculating the dielectric loss factor of the vehicle-mounted cable test sample in step S5 is as follows:
wherein, beta is dielectric loss factor, epsilon 0 Is a vacuum dielectric constant of ∈ r Is the dielectric constant of the test sample of the on-vehicle cable, ε' i Is the real part of the complex dielectric constant, ε ″) i Tan delta being the imaginary part of the complex dielectric constant i Is the dielectric loss tangent, i 1, 2.
Further, the formula for calculating the aging factor of the vehicle-mounted cable test sample in the step S6 is as follows:
wherein, lambda is an aging factor, alpha is a polarization factor, and beta is a dielectric loss factor.
Further, the step S7 detects the insulation aging degree of the cable test sample according to the following value ranges:
if lambda is less than or equal to 2.72, the insulation of the vehicle-mounted cable test sample is slightly aged;
if the lambda is more than 2.72 and less than or equal to 81.33, the insulation of the vehicle-mounted cable test sample is moderately aged;
if lambda is greater than 81.33, the insulation of the vehicle-mounted cable test sample is proved to be severely aged.
Compared with the prior art, the principle and the advantages of the scheme are as follows:
according to the scheme, the cable samples with different thermal aging degrees are subjected to polarization current test to obtain a polarization current value, a polarization factor is calculated, a dielectric loss test is performed to obtain a real part, an imaginary part and a dielectric loss angle tangent value of a complex dielectric constant, the dielectric loss factor is calculated, an aging factor is calculated, and the insulation aging degree of the cable samples is detected. According to the scheme, the aging factor of the vehicle-mounted cable in actual operation can be calculated, and the insulation aging degree of the vehicle-mounted cable in actual operation can be effectively and conveniently detected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the services required for the embodiments or the technical solutions in the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic flow chart of an evaluation method for insulation thermal aging of a vehicle-mounted cable based on polarization detection.
Detailed Description
The invention will be further illustrated with reference to specific examples:
as shown in fig. 1, a method for evaluating insulation thermal aging of a vehicle-mounted cable based on polarization detection according to an embodiment of the present invention includes the following steps:
s1, manufacturing a vehicle-mounted cable thermal aging test sample with the length of 1000mm, placing the vehicle-mounted cable test sample in an aging box with the aging temperature of T for T hours, wherein T is 150 ℃, and T is for {72n | n ═ 1,2,. and 10}, and performing thermal aging simulation;
s2, when the vehicle-mounted cable test sample is subjected to the polarization current test to obtain the polarization current value, firstly, the vehicle-mounted cable test sample which is not subjected to thermal aging is subjected to the polarization current test to obtain the polarization current value I which is not subjected to thermal aging p0 And then, after the thermal aging is carried out for t (72,144), … and 72n (n is 1,2, … and 10) hours, the aging box is closed, the vehicle-mounted cable test sample is taken out from the aging box after being cooled to the room temperature, the polarization current test is carried out on the vehicle-mounted cable test sample, and the polarization current value I subjected to the thermal aging is obtained pi ，i＝1,2,...,n；
S3, calculating the polarization factor alpha of the vehicle-mounted cable test sample:
in the above formula, S is the cross-sectional area of the insulation layer of the test sample of the vehicle-mounted cable, and the unit is mm 2 (ii) a L is the length of the vehicle-mounted cable test sample, and the unit is mm; t is the thermal ageing temperature, T is the thermal ageing time, I p0 A value of polarization current without heat aging pi For the thermally aged polarization current values, i ═ 1,2,. multidot., n;
s4, discharging the vehicle-mounted cable test sample after the polarized current test of the vehicle-mounted cable test sample is completed; then, the vehicle-mounted cable test sample was subjected to a dielectric loss test for t ═ 72,144, …,72n, (n ═ 1,2, …,10) hours to obtain the real part ∈ 'of the complex dielectric constant' i Imaginary part ε i And a dielectric loss tangent tan delta i ，i＝1,2,...,n；
S5, calculating the dielectric loss factor beta of the vehicle-mounted cable test sample:
in the above formula, ∈ 0 Is a vacuum dielectric constant with the unit of F/m, epsilon r The dielectric constant is the dielectric constant of a vehicle-mounted cable test sample and is expressed in F/m;
s6, calculating the aging factor lambda of the vehicle-mounted cable test sample based on the polarization factor alpha and the dielectric loss factor beta:
s7, the insulation aging degree of the cable test sample can be detected by calculating the aging factor lambda of the vehicle-mounted cable according to the following value ranges:
if the lambda is less than or equal to 2.72, the insulation of the vehicle-mounted cable test sample is slightly aged;
if the lambda is more than 2.72 and less than or equal to 81.33, the insulation of the vehicle-mounted cable test sample is moderately aged;
if lambda is greater than 81.33, the insulation of the vehicle-mounted cable test sample is proved to be severely aged.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that variations based on the shape and principle of the present invention should be covered within the scope of the present invention.
Claims (4)
1. A method for evaluating insulation thermal aging of a vehicle-mounted cable based on polarization detection is characterized by comprising the following steps:
s1, carrying out insulation thermal aging simulation on the vehicle-mounted cable test sample;
s2, carrying out a polarization current test on the vehicle-mounted cable test sample to obtain a polarization current value;
s3, calculating the polarization factor of the vehicle-mounted cable test sample;
s4, conducting dielectric loss test on the vehicle-mounted cable test sample to obtain the real part, the imaginary part and the dielectric loss angle tangent value of the complex dielectric constant;
s5, calculating the dielectric loss factor of the vehicle-mounted cable test sample;
s6, calculating the aging factor of the vehicle-mounted cable test sample;
s7, detecting the insulation aging degree of the vehicle-mounted cable test sample;
the step S1 of carrying out insulation thermal aging simulation on the vehicle-mounted cable test sample specifically comprises the following steps: manufacturing a vehicle-mounted cable thermal aging test sample, placing the vehicle-mounted cable test sample in an aging box with an aging temperature of T for T hours, and performing thermal aging simulation by using a T element (72 n) which is a member of 1,2, 10);
when the step S2 performs the polarization current test on the vehicle-mounted cable test sample to obtain the polarization current value, the polarization current test is performed on the vehicle-mounted cable test sample which is not subjected to thermal aging to obtain the polarization current value which is not subjected to thermal aging
Then, carrying out a polarization current test on the vehicle-mounted cable test sample subjected to thermal aging for t hours to obtain a polarization current value subjected to thermal aging
i＝1,2,...,n；
The calculation formula of the polarization factor of the vehicle-mounted cable test sample in the step S3 is as follows:
wherein alpha is a polarization factor, S is the cross-sectional area of an insulating layer of the vehicle-mounted cable test sample, L is the length of the vehicle-mounted cable test sample, T is a thermal aging temperature, T is a thermal aging time,
the value of the polarization current without heat aging,
for the thermally aged polarization current values, i is 1, 2.
2. The evaluation method for the thermal insulation aging of the vehicle-mounted cable based on the polarization detection as claimed in claim 1, wherein the calculation formula of the dielectric loss factor of the vehicle-mounted cable test sample in the step S5 is as follows:
wherein beta is the dielectric loss factor, epsilon 0 Is a vacuum dielectric constant of ∈ r Is the dielectric constant of the test sample of the on-vehicle cable, ε' i Is the real part of the complex dielectric constant,. epsilon' i Tan delta being the imaginary part of the complex dielectric constant i To be connected toA mass loss tangent, i ═ 1, 2.
3. The evaluation method for the thermal insulation aging of the vehicle-mounted cable based on the polarization detection as claimed in claim 2, wherein the formula for calculating the aging factor of the vehicle-mounted cable test sample in the step S6 is as follows:
wherein, lambda is aging factor, alpha is polarization factor, and beta is dielectric loss factor.
4. The evaluation method for the insulation thermal aging of the vehicle-mounted cable based on the polarization detection as claimed in claim 3, wherein the step S7 detects the insulation aging degree of the cable test sample according to the following value ranges:
if lambda is less than or equal to 2.72, the insulation of the vehicle-mounted cable test sample is slightly aged;
if the lambda is more than 2.72 and less than or equal to 81.33, the insulation of the vehicle-mounted cable test sample is moderately aged;
if lambda is greater than 81.33, the insulation of the vehicle-mounted cable test sample is proved to be severely aged.
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Citations (3)
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|---|---|---|---|---|
| CN101470058A (en) * | 2007-12-27 | 2009-07-01 | 大连理工大学 | Method for evaluating residual service life of marine low-pressure rubber-insulated cable |
| CN106644916A (en) * | 2017-03-06 | 2017-05-10 | 大连理工大学 | Method for evaluating ageing life of cable insulation material for ship |
| CN110736905A (en) * | 2019-11-08 | 2020-01-31 | 国网重庆市电力公司江北供电分公司 | Insulation aging evaluation method for 110kV XLPE high-voltage cable |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101470058A (en) * | 2007-12-27 | 2009-07-01 | 大连理工大学 | Method for evaluating residual service life of marine low-pressure rubber-insulated cable |
| CN106644916A (en) * | 2017-03-06 | 2017-05-10 | 大连理工大学 | Method for evaluating ageing life of cable insulation material for ship |
| CN110736905A (en) * | 2019-11-08 | 2020-01-31 | 国网重庆市电力公司江北供电分公司 | Insulation aging evaluation method for 110kV XLPE high-voltage cable |
Non-Patent Citations (2)
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| 基于极化/去极化电流法的交联聚乙烯电缆热老化程度判定;杨帆 等;《高电压技术》;20160229;第42卷(第2期);第497页右栏第3-4段、第498页第1.2节第2段、第500页右栏第2-3段 * |
| 电缆绝缘聚合物材料的老化成因机理及其研究现状;林木松 等;《高分子材料科学与工程》;20171231;第33卷(第12期);第150页左栏第1段、第150页右栏第1段、第151-152页第（4）节 * |
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