CN112858853A - Method for testing and detecting moisture degree of vehicle-mounted EPR cable in acidic environment - Google Patents
Method for testing and detecting moisture degree of vehicle-mounted EPR cable in acidic environment Download PDFInfo
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- CN112858853A CN112858853A CN202110111528.6A CN202110111528A CN112858853A CN 112858853 A CN112858853 A CN 112858853A CN 202110111528 A CN202110111528 A CN 202110111528A CN 112858853 A CN112858853 A CN 112858853A
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- aging
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- 230000002378 acidificating effect Effects 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 title claims abstract description 18
- 230000032683 aging Effects 0.000 claims abstract description 43
- 238000002474 experimental method Methods 0.000 claims abstract description 23
- 230000007547 defect Effects 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 238000009736 wetting Methods 0.000 claims abstract description 11
- 230000001133 acceleration Effects 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000013016 damping Methods 0.000 abstract 3
- 238000012423 maintenance Methods 0.000 abstract 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 23
- 238000003916 acid precipitation Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
Images
Classifications
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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
-
- 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
- G01R31/20—Preparation of articles or specimens to facilitate testing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a method for testing and detecting the moisture degree of a vehicle-mounted EPR cable in an acidic environment, which comprises the following steps: s1, manufacturing a cable experiment sample; s2, manufacturing air gap defects on the cable experiment sample manufactured in the step S1; s3, preparing an acidic aging solution for experiments; s4, accelerating the damp aging of the cable experiment sample; s5, conducting a medium loss test after aging, and measuring a medium loss tangent value tan delta; s6, calculating an accelerated wetting factor mu; and S7, judging the moisture degree of the vehicle-mounted EPR cable based on the acceleration moisture factor. The invention designs an experiment for accelerating the damping of the vehicle-mounted cable in an acidic environment, can accurately and efficiently detect the damping degree of the vehicle-mounted EPR cable, provides technical support for the damping detection of the vehicle-mounted cable, and reduces the operation and maintenance cost.
Description
Technical Field
The invention relates to the technical field of cable insulation aging experiments and detection, in particular to an experiment and detection method for the moisture degree of a vehicle-mounted EPR cable in an acidic environment.
Background
The ethylene propylene rubber has excellent electrical characteristics and heat resistance, and has stable insulation quality as an insulation layer of a vehicle-mounted cable. However, most of the vehicle-mounted cables are exposed outside the train body, and are often subjected to natural phenomena such as rain and the like, particularly acid rain occurs in some regions, and moisture is very easy to invade under the condition that the cable terminal is poor in sealing or has defects, so that the interior of the cable is wetted, the running safety of the motor train unit is seriously threatened, and sufficient attention is paid to the situation.
In order to effectively and conveniently explore the influence of acid rain on the degree of wetting of on-vehicle EPR cable, reduce and avoid the economic loss that cable fault caused, need urgently a on-vehicle EPR cable degree of wetting experiment and detection method under the acid environment to grasp the influence of acid rain on the degree of wetting of on-vehicle cable, avoid the further degradation of cable.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for testing and detecting the moisture degree of a vehicle-mounted EPR cable in an acidic environment, so that the influence of acid rain on the moisture degree of the vehicle-mounted EPR cable is effectively and conveniently researched, and the economic loss caused by cable faults is reduced.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a method for testing and detecting the moisture degree of a vehicle-mounted EPR cable in an acidic environment comprises the following steps:
s1, manufacturing a cable experiment sample;
s2, manufacturing air gap defects on the cable experiment sample manufactured in the step S1;
s3, preparing an acidic aging solution for experiments;
s4, accelerating the damp aging of the cable experiment sample;
s5, conducting a medium loss test after aging, and measuring a medium loss tangent value tan delta;
s6, calculating an accelerated wetting factor mu;
and S7, judging the moisture degree of the vehicle-mounted EPR cable based on the acceleration moisture factor.
Further, the specific process of making the cable experiment sample in the step S1 is as follows:
firstly, stripping the outer sheath of the vehicle-mounted EPR cable, then cutting the cable into a short cable sample, stripping the outer semi-conductive shielding layers at two ends of the short cable sample, and then stripping the insulating layer at one end of the short cable sample to expose the cable core.
Further, the step S2 is a specific process for manufacturing an air gap defect:
uniformly manufacturing air gap defects in the middle section of an outer semi-conducting layer of a short cable sample without stripping by using steel needles, wherein the air gap defects of the needle holes are divided into an upper row and a lower row, and the number of the air gaps of each row of the needle holes is recorded as n; wherein, the curvature radius of the steel needle is (3 +/-0.5) mu m, and the chamfer angle is 15 +/-3 degrees.
Further, the configuration process of the acidic aging solution in the step S3 is as follows:
preparing an acidic aging solution with the concentration of 1mol/L by using an HCL solution, an NaOH solution and clear water in a corrosion-resistant container, and measuring the pH value of the aging solution by using a pH sensor and recording as alpha.
Further, the specific process of step S4 is as follows:
and (3) placing the short cable sample with the air gap defect in an aging solution with the pH value of alpha, externally connecting a cable core with a high-frequency high-voltage power supply, inserting a grounding electrode into the aging solution, perfectly grounding, and finally sealing the container to accelerate the short cable sample to be damped and aged for d days in the aging solution.
Further, the step S6 includes introducing the number of pin hole air gaps in each row on the short cable sample, the number of days for accelerated wetting and aging of the short cable sample, the frequency of the high-frequency high-voltage power supply externally connected to the cable core, the ph value of the aging solution, and the dielectric loss angle to calculate an accelerated wetting factor μ, where the calculation formula is as follows:
in the above formula, n is the number of the air gaps of each row of pin holes on the short cable sample, d is the number of days for accelerating the aging of the short cable sample due to damp, f is the frequency of a high-frequency high-voltage power supply externally connected with the cable core, alpha is the pH value of an aging solution, and delta is a dielectric loss angle.
Further, the step S7 is to judge the moisture degree of the vehicle-mounted EPR cable based on the acceleration moisture factor, specifically:
when in use
When the vehicle-mounted EPR cable is slightly affected with damp;
when in use
When the vehicle-mounted EPR cable is moderately damp;
when in use
In time, the onboard EPR cable is heavily dampened.
Compared with the prior art, the principle and the advantages of the scheme are as follows:
the experiment that the on-vehicle cable accelerated to damp under this scheme design acid environment to can detect the degree that on-vehicle EPR cable dampened accurately, high-efficiently, damp for on-vehicle cable and detect and provide technical support, reduce fortune dimension cost.
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 a method for testing and detecting the moisture degree of a vehicle-mounted EPR cable in an acidic environment.
Detailed Description
The invention will be further illustrated with reference to specific examples:
the invention embodiment provides a method for testing and detecting the moisture degree of a vehicle-mounted EPR cable in an acidic environment, which comprises the following steps:
s1, preparing a cable experiment sample:
firstly, stripping an outer sheath of the vehicle-mounted EPR cable, then cutting the cable into a short cable sample with the length of 400mm, stripping outer semi-conductive shielding layers with the lengths of 120mm at two ends of the short cable sample, and then stripping an insulating layer with one end of 8mm of the short cable sample to expose a cable core.
S2, manufacturing air gap defects on the cable experimental sample manufactured in step S1:
uniformly manufacturing air gap defects with the depth of 3mm in the middle section of an unpeeled outer semi-conducting layer of a short cable sample by using a steel needle, wherein the distance between the air gap defects of the needle holes is 10mm, the air gap defects of the needle holes are divided into an upper row and a lower row, and the number of the air gaps of each row of needle holes is recorded as n; wherein, the curvature radius of the steel needle is 3 μm, and the chamfer angle is 15 deg.
S3, acidic aging solution configured for experiment:
preparing an acidic aging solution with the concentration of 1mol/L by using an HCL solution, an NaOH solution and clear water in a corrosion-resistant container, and measuring the pH value of the aging solution by using a pH sensor and recording as alpha.
S4, accelerating the damp aging of the cable experiment sample:
the short cable sample with the air gap defect is placed in an aging solution with the pH value of alpha, a cable core is externally connected with a high-frequency high-voltage power supply, wherein the applied voltage of the power supply is 27.5kV, the frequency is f, and the unit is Hertz (Hz), a grounding electrode is inserted into the aging solution and is grounded perfectly, and finally, a container is sealed, so that the short cable sample is subjected to accelerated damp aging in the aging solution for d days.
S5, conducting a medium loss test after aging, and measuring a medium loss tangent value tan delta;
s6, introducing the number of air gaps of each row of pin holes on the short cable sample, the number of days for accelerated wetting and aging of the short cable sample, the frequency of a high-frequency high-voltage power supply externally connected with the cable core, the pH value of an aging solution and a dielectric loss angle, and calculating an accelerated wetting factor mu according to the following calculation formula:
in the above formula, n is the number of the air gaps of each row of pin holes on the short cable sample, d is the number of days for accelerating the aging of the short cable sample due to damp, f is the frequency of a high-frequency high-voltage power supply externally connected with the cable core, alpha is the pH value of an aging solution, and delta is a dielectric loss angle.
S7, judging the moisture degree of the vehicle-mounted EPR cable based on the acceleration moisture factor:
when in use
When the vehicle-mounted EPR cable is slightly affected with damp;
when in use
When the vehicle-mounted EPR cable is moderately damp;
when in use
In time, the onboard EPR cable is heavily dampened.
The experiment that the on-vehicle cable accelerated to damp under this embodiment design acid environment to can accurately, detect the degree that on-vehicle EPR cable dampened high-efficiently, damp for on-vehicle cable and detect and provide technical support, reduce fortune dimension cost.
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 (7)
1. The utility model provides a vehicle-mounted EPR cable degree of wetting experiment and detection method under acid environment which characterized in that includes following steps:
s1, manufacturing a cable experiment sample;
s2, manufacturing air gap defects on the cable experiment sample manufactured in the step S1;
s3, preparing an acidic aging solution for experiments;
s4, accelerating the damp aging of the cable experiment sample;
s5, conducting a medium loss test after aging, and measuring a medium loss tangent value tan delta;
s6, calculating an accelerated wetting factor mu;
and S7, judging the moisture degree of the vehicle-mounted EPR cable based on the acceleration moisture factor.
2. The method for testing and detecting the moisture degree of the vehicle-mounted EPR cable in the acidic environment according to claim 1, wherein the specific process of making the cable test sample in the step S1 is as follows:
firstly, stripping the outer sheath of the vehicle-mounted EPR cable, then cutting the cable into a short cable sample, stripping the outer semi-conductive shielding layers at two ends of the short cable sample, and then stripping the insulating layer at one end of the short cable sample to expose the cable core.
3. The method for testing and detecting the moisture degree of the vehicle-mounted EPR cable in the acidic environment according to claim 1, wherein the step S2 is implemented by the following specific steps:
uniformly manufacturing air gap defects in the middle section of an outer semi-conducting layer of a short cable sample without stripping by using steel needles, wherein the air gap defects of the needle holes are divided into an upper row and a lower row, and the number of the air gaps of each row of the needle holes is recorded as n; wherein, the curvature radius of the steel needle is (3 +/-0.5) mu m, and the chamfer angle is 15 +/-3 degrees.
4. The method for testing and detecting the moisture degree of the vehicle-mounted EPR cable in the acidic environment according to claim 1, wherein the step S3 is to configure the acidic aging solution by:
preparing an acidic aging solution with the concentration of 1mol/L by using an HCL solution, an NaOH solution and clear water in a corrosion-resistant container, and measuring the pH value of the aging solution by using a pH sensor and recording as alpha.
5. The method for testing and detecting the moisture degree of the vehicle-mounted EPR cable in the acidic environment according to claim 1, wherein the specific process of the step S4 is as follows:
and (3) placing the short cable sample with the air gap defect in an aging solution with the pH value of alpha, externally connecting a cable core with a high-frequency high-voltage power supply, inserting a grounding electrode into the aging solution, perfectly grounding, and finally sealing the container to accelerate the short cable sample to be damped and aged for d days in the aging solution.
6. The method for testing and detecting the moisture degree of the vehicle-mounted EPR cable in the acidic environment according to claim 1, wherein the step S6 includes the following steps of introducing the number of the pin hole air gaps in each row on the short cable sample, the number of days for accelerating the moisture aging of the short cable sample, the frequency of the high-frequency high-voltage power supply externally connected to the cable core, the pH value of the aging solution and the dielectric loss angle to calculate the accelerated moisture factor mu, wherein the calculation formula is as follows:
in the above formula, n is the number of the air gaps of each row of pin holes on the short cable sample, d is the number of days for accelerating the aging of the short cable sample due to damp, f is the frequency of a high-frequency high-voltage power supply externally connected with the cable core, alpha is the pH value of an aging solution, and delta is a dielectric loss angle.
7. The method for testing and detecting the moisture degree of the vehicle-mounted EPR cable in the acidic environment according to claim 1, wherein the step S7 of judging the moisture degree of the vehicle-mounted EPR cable based on the accelerated moisture factor is specifically as follows:
when in use
When the vehicle-mounted EPR cable is slightly affected with damp;
when in use
When the vehicle-mounted EPR cable is moderately damp;
when in use
In time, the onboard EPR cable is heavily dampened.
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| CN202110111528.6A CN112858853B (en) | 2021-01-27 | 2021-01-27 | Method for testing and detecting moisture degree of vehicle-mounted EPR cable in acidic environment |
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| CN202110111528.6A CN112858853B (en) | 2021-01-27 | 2021-01-27 | Method for testing and detecting moisture degree of vehicle-mounted EPR cable in acidic environment |
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| CN117825879A (en) * | 2023-11-20 | 2024-04-05 | 西南交通大学 | Evaluation method for insulation performance of power cable in acid-base environment |
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| CN112858853B (en) | 2022-08-12 |
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