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 PDF

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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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cable
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CN112858853B (en
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唐惠玲
王天玮
陈柏任
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Guangdong University of Technology
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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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Abstract

本发明公开了一种酸性环境下车载EPR电缆受潮程度实验与检测方法，包括以下步骤：S1、制作电缆实验样本；S2、在步骤S1制作的电缆实验样本上制造气隙缺陷；S3、配置用于实验的酸性老化溶液；S4、加速电缆实验样本的受潮老化；S5、进行老化后的介质损耗测试，测得介质损耗角正切值tanδ；S6、计算加速受潮因子μ；S7、基于加速受潮因子判断车载EPR电缆的受潮程度。本发明设计酸性环境下车载电缆加速受潮的实验，并且能准确、高效地检测车载EPR电缆受潮的程度，为车载电缆受潮检测提供技术支持，降低运维成本。

Figure 202110111528

The invention discloses an experiment and detection method for the degree of dampness of vehicle-mounted EPR cables in an acidic environment, comprising the following steps: S1, making a cable experiment sample; S2, making air gap defects on the cable experiment sample prepared in step S1; S3, configuring a Acid aging solution used in the experiment; S4, accelerate the moisture aging of the cable experimental sample; S5, carry out the dielectric loss test after aging, and measure the dielectric loss tangent tanδ; S6, calculate the accelerated moisture factor μ; S7, based on the accelerated moisture factor Determine the moisture level of the vehicle EPR cable. The invention designs an experiment of accelerated damping of vehicle-mounted cables in an acidic environment, can accurately and efficiently detect the degree of damping of vehicle-mounted EPR cables, provides technical support for vehicle-mounted cables damped detection, and reduces operation and maintenance costs.

Figure 202110111528

Description

Method for testing and detecting moisture degree of vehicle-mounted EPR cable in acidic environment
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:
Figure BDA0002919337420000021
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
Figure BDA0002919337420000031
When the vehicle-mounted EPR cable is slightly affected with damp;
when in use
Figure BDA0002919337420000032
When the vehicle-mounted EPR cable is moderately damp;
when in use
Figure BDA0002919337420000033
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.
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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:
Figure BDA0002919337420000041
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
Figure BDA0002919337420000042
When the vehicle-mounted EPR cable is slightly affected with damp;
when in use
Figure BDA0002919337420000051
When the vehicle-mounted EPR cable is moderately damp;
when in use
Figure BDA0002919337420000052
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)

1.一种酸性环境下车载EPR电缆受潮程度实验与检测方法，其特征在于，包括以下步骤：1. a vehicle-mounted EPR cable dampness degree experiment and detection method under an acidic environment, is characterized in that, comprises the following steps: S1、制作电缆实验样本；S1. Make cable experimental samples; S2、在步骤S1制作的电缆实验样本上制造气隙缺陷；S2, creating air gap defects on the cable experimental sample produced in step S1; S3、配置用于实验的酸性老化溶液；S3. Configure the acid aging solution for the experiment; S4、加速电缆实验样本的受潮老化；S4. Accelerate the moisture aging of the cable test sample; S5、进行老化后的介质损耗测试，测得介质损耗角正切值tanδ；S5. Carry out the dielectric loss test after aging, and measure the dielectric loss tangent value tanδ; S6、计算加速受潮因子μ；S6. Calculate the accelerated moisture factor μ; S7、基于加速受潮因子判断车载EPR电缆的受潮程度。S7. Determine the degree of dampness of the vehicle-mounted EPR cable based on the accelerated dampness factor. 2.根据权利要求1所述的一种酸性环境下车载EPR电缆受潮程度实验与检测方法，其特征在于，所述步骤S1制作电缆实验样本的具体过程如下：2. a kind of vehicle-mounted EPR cable dampness degree experiment and detection method under a kind of acid environment according to claim 1, is characterized in that, the concrete process that described step S1 makes cable experiment sample is as follows: 首先，剥除车载EPR电缆的外护套，然后把电缆截成短电缆样本，并剥除短电缆样本两端的外半导电屏蔽层，接着剥除短电缆样本一端的绝缘层，露出缆芯。First, strip the outer jacket of the vehicle EPR cable, then cut the cable into short cable samples, strip off the outer semiconductive shielding layer at both ends of the short cable sample, and then strip off the insulation layer at one end of the short cable sample to expose the cable core. 3.根据权利要求1所述的一种酸性环境下车载EPR电缆受潮程度实验与检测方法，其特征在于，所述步骤S2制造气隙缺陷的具体过程为：3. under a kind of acid environment according to claim 1, vehicle-mounted EPR cable dampness degree experiment and detection method, it is characterized in that, the concrete process that described step S2 manufactures air gap defect is: 使用钢针在短电缆样本未剥除外半导电层的中间段均匀制造气隙缺陷，针孔气隙缺陷分上下两排，每排针孔气隙个数记为n；其中，钢针的曲率半径为(3±0.5)μm，倒角为15°±3°。Use a steel needle to uniformly create air gap defects in the middle section of the short cable sample without stripping the outer semiconductive layer. The pinhole air gap defects are divided into upper and lower rows, and the number of pinhole air gaps in each row is recorded as n; among them, the curvature of the steel needle The radius is (3±0.5) μm, and the chamfering angle is 15°±3°. 4.根据权利要求1所述的一种酸性环境下车载EPR电缆受潮程度实验与检测方法，其特征在于，所述步骤S3酸性老化溶液的配置过程为：4. vehicle-mounted EPR cable dampness degree experiment and detection method under a kind of acid environment according to claim 1, is characterized in that, the configuration process of described step S3 acid aging solution is: 在耐腐蚀容器中使用HCL溶液、NaOH溶液以及清水配置浓度为1mol/L的酸性老化溶液，并使用PH传感器测量老化溶液的酸碱度，记为α。Use HCL solution, NaOH solution and clean water to prepare an acidic aging solution with a concentration of 1 mol/L in a corrosion-resistant container, and use a pH sensor to measure the pH of the aging solution, which is recorded as α. 5.根据权利要求1所述的一种酸性环境下车载EPR电缆受潮程度实验与检测方法，其特征在于，所述步骤S4的具体过程如下：5. under a kind of acid environment according to claim 1, vehicle-mounted EPR cable dampness degree experiment and detection method, it is characterized in that, the concrete process of described step S4 is as follows: 将带有气隙缺陷的短电缆样本置于酸碱度为α的老化溶液中，缆芯外接高频高压电源，将接地电极插入老化溶液中，并完好接地，最后密封容器，使短电缆样本在老化溶液中进行加速受潮老化d天。The short cable sample with air gap defect is placed in an aging solution with a pH of α, the cable core is connected to a high-frequency high-voltage power supply, the ground electrode is inserted into the aging solution, and the ground is well grounded. Accelerated moisture aging in solution for d days. 6.根据权利要求1所述的一种酸性环境下车载EPR电缆受潮程度实验与检测方法，其特征在于，所述步骤S6引入短电缆样本上每排针孔气隙的个数、短电缆样本加速受潮老化的天数、缆芯外接高频高压电源的频率、老化溶液的酸碱度、介质损耗角计算加速受潮因子μ，计算公式如下：6. Vehicle-mounted EPR cable dampness degree experiment and detection method under a kind of acid environment according to claim 1, is characterized in that, described step S6 introduces the number of every row of pinhole air gaps on short cable sample, short cable sample The number of days for accelerated moisture aging, the frequency of the external high-frequency high-voltage power supply to the cable core, the pH of the aging solution, and the dielectric loss angle are used to calculate the accelerated moisture factor μ. The calculation formula is as follows:
Figure FDA0002919337410000021
Figure FDA0002919337410000021
 上式中，n为短电缆样本上每排针孔气隙的个数，d为短电缆样本加速受潮老化的天数，f为缆芯外接高频高压电源的频率，α为老化溶液的酸碱度，δ为介质损耗角。In the above formula, n is the number of air gaps in each row of pinholes on the short cable sample, d is the number of days for the short cable sample to accelerate moisture aging, f is the frequency of the high-frequency high-voltage power supply connected to the cable core, α is the pH of the aging solution, δ is the dielectric loss angle. 7.根据权利要求1所述的一种酸性环境下车载EPR电缆受潮程度实验与检测方法，其特征在于，所述步骤S7基于加速受潮因子判断车载EPR电缆的受潮程度具体为：7. Under a kind of acid environment according to claim 1, the dampness degree experiment of vehicle-mounted EPR cable and detection method, it is characterized in that, described step S7 judges the dampness degree of vehicle-mounted EPR cable based on accelerated dampness factor and is specifically: 当
Figure FDA0002919337410000022
时，车载EPR电缆轻度受潮；when
Figure FDA0002919337410000022
When the vehicle EPR cable is slightly damp; 当
Figure FDA0002919337410000023
时，车载EPR电缆中度受潮；when
Figure FDA0002919337410000023
When the vehicle EPR cable is moderately damp; 当
Figure FDA0002919337410000024
时，车载EPR电缆重度受潮。when
Figure FDA0002919337410000024
When the vehicle EPR cable is heavily damped.
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CN113686770B (en) * 2021-07-27 2023-08-11 清华大学深圳国际研究生院 Multi-factor acceleration damping test device and method for power cable
CN117825879A (en) * 2023-11-20 2024-04-05 西南交通大学 A method for evaluating the insulation performance of power cables in acid-base environment

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