CN110672644B - Cable buffer layer state evaluation method and system - Google Patents
Cable buffer layer state evaluation method and system Download PDFInfo
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- CN110672644B CN110672644B CN201910831033.3A CN201910831033A CN110672644B CN 110672644 B CN110672644 B CN 110672644B CN 201910831033 A CN201910831033 A CN 201910831033A CN 110672644 B CN110672644 B CN 110672644B
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- 238000011156 evaluation Methods 0.000 title claims abstract description 26
- 238000000926 separation method Methods 0.000 claims abstract description 55
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 34
- 230000001681 protective effect Effects 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000004364 calculation method Methods 0.000 claims description 16
- 238000009413 insulation Methods 0.000 claims description 16
- 239000004020 conductor Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000002679 ablation Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 3
- 229920003020 cross-linked polyethylene Polymers 0.000 description 3
- 239000004703 cross-linked polyethylene Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
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Abstract
The invention relates to the technical field of electrician detection, in particular to a method and a system for evaluating the state of a cable buffer layer, wherein the method comprises the following steps: acquiring a perspective view of a cable to be tested; calculating the separation length of the cable to be detected according to the perspective view of the cable to be detected; the disengagement length is: the actual separation length of the corrugated aluminum protective sleeve and the buffer layer in the tested cable; calculating the allowable distance of the tested cable according to the parameters of the tested cable; the allowable distance is: the length of the corrugated aluminum protective sleeve and the buffer layer in the tested cable allowed to be separated; and comparing the separation length and the allowable distance of the tested cable to obtain the evaluation result of the tested cable. The invention can intuitively and accurately evaluate the state of the buffer layer.
Description
Technical Field
The invention relates to the technical field of electrician detection, in particular to a method and a system for evaluating the state of a cable buffer layer.
Background
The technological level of the insulation manufacturing of power cables in China reaches the advanced level of the world, however, insulation breakdown faults caused by ablation of buffer layers of high-voltage cross-linked polyethylene (XLPE) insulation cables in operation still occur in China from 2011 to the present. According to the preliminary analysis of the breakdown faults and defects of more than dozens of bodies in Beijing, Shanghai, Jiangsu, Hunan and other places, the fault phenomena are found to be highly consistent. The insulation breakdown failure caused by the discharge ablation of the cable buffer layer is the only factor except the external force damage, which seriously influences the operation reliability of the high-voltage cable. However, ablation of the buffer layer of a high voltage cable lacks effective countermeasures, as well as inspection and detection means and defect assessment methods. Meanwhile, the defect characteristics of the buffer layer ablation by discharge are different from other defects of a cable line, and the buffer layer ablation defect can be effectively detected through the existing electrified or offline maintenance equipment and technical means without verification.
Disclosure of Invention
The invention aims to solve the technical problem of providing a cable buffer layer state evaluation method and system, which can intuitively and accurately evaluate the buffer layer state.
The technical scheme adopted by the invention for solving the technical problems is as follows: on one hand, the method for evaluating the buffer layer state of the construction cable comprises the following steps:
acquiring a perspective view of a cable to be tested;
calculating the separation length of the cable to be detected according to the perspective view of the cable to be detected; the disengagement length is: the actual separation length of the corrugated aluminum protective sleeve and the buffer layer in the tested cable;
calculating the allowable distance of the tested cable according to the parameters of the tested cable; the allowable distance is: the length of the corrugated aluminum protective sleeve and the buffer layer in the tested cable allowed to be separated;
and comparing the separation length and the allowable distance of the tested cable to obtain the evaluation result of the tested cable.
Further, the acquiring of the perspective view of the tested cable specifically includes:
and taking a picture of the inlet wire of the tested cable through a pulse ray machine to obtain an X-ray perspective view of the tested cable.
Furthermore, the calculating of the detachment length of the cable to be measured according to the perspective view of the cable to be measured specifically includes:
identifying the part, actually separated from the buffer layer, of the corrugated aluminum protective sleeve in the tested cable according to the perspective view of the tested cable;
calculating the number of wave crests or wave troughs contained in the actually separated part of the corrugated aluminum protective sleeve and the buffer layer in the tested cable;
measuring the distance between two adjacent wave crests or wave troughs;
and calculating the separation length of the tested cable according to the distance between two adjacent peaks or troughs and the number of peaks or troughs contained in the actually separated part.
Still further, the calculating the allowable distance of the measured cable according to the parameter of the measured cable specifically includes:
acquiring parameters of a tested cable, wherein the parameters comprise: the cable conductor shielding outer diameter, the cable insulating layer outer diameter, the buffer layer thickness, the cable insulating layer material dielectric constant, the buffer layer resistivity, the working voltage, the buffer layer allowable longitudinal voltage and the working power supply frequency;
calculating the allowable distance L of the tested cable according to the parameters; the concrete formula is as follows:
in the formula (1), d1For shielding the cable conductor by the outer diameter d2The outer diameter of the cable insulation layer, delta the thickness of the buffer layer, epsilon the dielectric constant of the cable insulation layer material, rho the resistivity of the buffer layer, U0Working voltage, Us buffer layer allowed longitudinal voltage, f working power frequency.
Still further, the comparing the separation length and the allowable distance of the tested cable to obtain the evaluation result of the tested cable specifically includes:
comparing the separation length and the allowable distance of the tested cable;
when the separation length is smaller than the allowable distance, evaluating that the tested cable can continue to run;
and when the separation length is greater than or equal to the allowable distance, evaluating that the tested cable is in burning risk.
In another aspect, a cable buffer condition evaluation system is constructed comprising:
the acquisition unit is used for acquiring a perspective view of the tested cable;
the calculation separation unit is used for calculating the separation length of the cable to be measured according to the perspective view of the cable to be measured; the disengagement length is:
the actual separation length of the corrugated aluminum protective sleeve and the buffer layer in the tested cable;
the calculation allowing unit is used for calculating and obtaining the allowed distance of the tested cable according to the parameters of the tested cable; the allowable distance is: the length of the corrugated aluminum protective sleeve and the buffer layer in the tested cable allowed to be separated;
and the comparison and evaluation unit is used for comparing the separation length and the allowable distance of the tested cable to obtain the evaluation result of the tested cable.
Further, the obtaining unit is specifically configured to:
and taking a picture of the inlet wire of the tested cable through a pulse ray machine to obtain an X-ray perspective view of the tested cable.
Still further, the calculation detachment unit includes:
the identification module is used for identifying the part, actually separated from the buffer layer, of the corrugated aluminum protective sleeve in the tested cable according to the perspective view of the tested cable;
the first calculation module is used for calculating the number of wave crests or wave troughs contained in the part, actually separated from the buffer layer, of the corrugated aluminum protective sleeve in the tested cable;
the measuring module is used for measuring the distance between two adjacent wave crests or wave troughs;
and the second calculation module is used for calculating the separation length of the tested cable according to the distance between two adjacent peaks or troughs and the number of the peaks or the troughs contained in the actually separated part.
Still further, the calculation permission unit includes:
the acquisition module is used for acquiring parameters of the tested cable, and the parameters comprise: the cable conductor shielding outer diameter, the cable insulating layer outer diameter, the buffer layer thickness, the cable insulating layer material dielectric constant, the buffer layer resistivity, the working voltage, the buffer layer allowable longitudinal voltage and the working power supply frequency;
the third calculating unit is used for calculating the allowable distance L of the tested cable according to the parameters; the concrete formula is as follows:
in the formula (1), d1For shielding the cable conductor by the outer diameter d2The outer diameter of the cable insulation layer, delta the thickness of the buffer layer, epsilon the dielectric constant of the cable insulation layer material, rho the resistivity of the buffer layer, U0Working voltage, Us buffer layer allowed longitudinal voltage, f working power frequency.
Still further, the comparison and evaluation unit is specifically configured to:
comparing the separation length and the allowable distance of the tested cable;
when the separation length is smaller than the allowable distance, evaluating that the tested cable can continue to run;
and when the separation length is greater than or equal to the allowable distance, evaluating that the tested cable is in burning risk.
The implementation of the invention has the following beneficial effects:
1. the invention adopts an image recognition mode, so that the judgment of the detection result is more intuitive, and meanwhile, the accuracy of the judgment result is improved by combining the field measurement of the distance between wave crests or wave troughs of the corrugated aluminum sheath.
2. The invention adopts the separation length as a parameter to evaluate the state, and has uniqueness, flexible field application and high detection efficiency.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a schematic diagram of the system of the present invention;
FIG. 3 is a schematic flow chart of a method according to an embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the method for evaluating the state of the buffer layer of the cable according to the present invention includes:
101. acquiring a perspective view of a cable to be tested; specifically, the method comprises the following steps:
and taking a picture of the inlet wire of the tested cable through a pulse ray machine to obtain an X-ray perspective view of the tested cable.
102. Calculating the separation length of the cable to be detected according to the perspective view of the cable to be detected; the disengagement length is: the actual separation length of the corrugated aluminum protective sleeve and the buffer layer in the tested cable; specifically, the method comprises the following steps:
1021. identifying the part, actually separated from the buffer layer, of the corrugated aluminum protective sleeve in the tested cable according to the perspective view of the tested cable;
1022. calculating the number n of wave crests or wave troughs contained in the actually separated part of the corrugated aluminum protective sleeve and the buffer layer in the tested cable;
1023. measuring the distance a between two adjacent peaks or troughs; specifically, the method comprises the following steps:
1024. and calculating the separation length of the tested cable according to the distance between two adjacent peaks or troughs and the number of peaks or troughs contained in the actually separated part.
In the invention, the separation length l of the tested cable is (n +2) multiplied by a;
103. calculating the allowable distance of the tested cable according to the parameters of the tested cable; the allowable distance is: the length of the corrugated aluminum protective sleeve and the buffer layer in the tested cable allowed to be separated; specifically, the method comprises the following steps:
acquiring parameters of a tested cable, wherein the parameters comprise: the cable conductor shielding outer diameter, the cable insulating layer outer diameter, the buffer layer thickness, the cable insulating layer material dielectric constant, the buffer layer resistivity, the working voltage, the buffer layer allowable longitudinal voltage and the working power supply frequency;
calculating the allowable distance L of the tested cable according to the parameters; the concrete formula is as follows:
in the formula (1), d1For shielding the cable conductor by the outer diameter d2The outer diameter of the cable insulation layer, delta the thickness of the buffer layer, epsilon the dielectric constant of the cable insulation layer material, rho the resistivity of the buffer layer, U0Working voltage, Us buffer layer allowed longitudinal voltage, f working power frequency.
104. Comparing the separation length and the allowable distance of the tested cable to obtain an evaluation result of the tested cable; specifically, the method comprises the following steps:
comparing the separation length and the allowable distance of the tested cable;
when the separation length is smaller than the allowable distance, evaluating that the tested cable can continue to run;
and when the separation length is greater than or equal to the allowable distance, evaluating that the tested cable is in burning risk.
In the invention, if the corrugated aluminum protective sleeve in the tested cable is not separated from the buffer layer, the tested cable is evaluated to be in good contact without burning risk.
The above technical solutions of the embodiments of the present invention are described in detail below with reference to application examples:
as shown in fig. 3, the cable buffer layer state evaluation method according to the present invention:
example 1, a cable test site;
step 1, acquiring an X-ray perspective image of a cable by adopting a portable pulse ray machine;
if the corrugated aluminum sheath is not separated from the buffer layer, directly evaluating the good contact of the tested cable;
if the corrugated aluminum sheath and the buffer layer have a certain length and are not in contact, entering step 3;
step 3, identifying 18 untouched wave crests through the image; measuring the distance between two adjacent wave crests of the corrugated aluminum sheath by 2cm on site to obtain the separation length of the corrugated aluminum sheath and the buffer layer, wherein the separation length is 40 cm;
step 4, obtaining parameters of the cable, wherein the cable is a 110kV 630mm2XLPE cable, and the outer diameter d of a cable conductor shield of the cable1Is 32.8mm, and the outer diameter d of the cable insulation layer265.8mm, the thickness delta of the buffer layer is 3mm, the cable insulation layer is made of XLPE, the dielectric constant epsilon is 2.3, and the resistivity rho of the buffer layer is 106Omega mm, working voltage of U0Is 6.4X 103V, allowing the longitudinal voltage Us to be 100V and the working power supply frequency f to be 50Hz by the buffer layer;
step 5, calculating to obtain the allowable distance L of the tested cable, which is 18.75 cm;
step 6, comparing the separation length of the cable with the allowable distance,
and 7, obtaining an evaluation conclusion that: the cable to be tested is at risk of burning.
Example 2:
buffer layer resistivity ρ of 105Omega mm, the other parameters of the tested cable are the same as those of the embodiment 1. From this it can be calculated: the allowable distance of the tested cable is 118.6 cm. Therefore, the cable was evaluated as: operation may continue.
As shown in fig. 2, the cable buffer layer state evaluation system according to the present invention includes:
an acquisition unit 21 for acquiring a perspective view of the cable under test;
the calculation detachment unit 22 is used for calculating the detachment length of the cable to be detected according to the perspective view of the cable to be detected; the disengagement length is:
the actual separation length of the corrugated aluminum protective sleeve and the buffer layer in the tested cable;
the calculation allowing unit 23 is used for calculating the allowed distance of the cable to be measured according to the parameters of the cable to be measured; the allowable distance is: the length of the corrugated aluminum protective sleeve and the buffer layer in the tested cable allowed to be separated;
and the comparison and evaluation unit 24 is used for comparing the separation length and the allowable distance of the tested cable to obtain an evaluation result of the tested cable.
The obtaining unit 21 is specifically configured to:
shooting the incoming line of the tested cable through a pulse ray machine to obtain an X-ray perspective view of the tested cable;
the calculation detachment unit 22 includes:
the identification module 221 is used for identifying the part, actually separated from the buffer layer, of the corrugated aluminum protective sleeve in the tested cable according to the perspective view of the tested cable;
the first calculating module 222 is used for calculating the number of wave crests or wave troughs included in the actually separated part of the corrugated aluminum protective sleeve and the buffer layer in the tested cable;
a measuring module 223, configured to measure a distance between two adjacent peaks or troughs;
and the second calculating module 334 is configured to calculate the separation length of the cable to be detected according to the distance between two adjacent peaks or troughs and the number of peaks or troughs included in the actually separated portion.
The calculation allowing unit 23 includes:
an obtaining module 231, configured to obtain parameters of the cable to be tested, where the parameters include: the cable conductor shielding outer diameter, the cable insulating layer outer diameter, the buffer layer thickness, the cable insulating layer material dielectric constant, the buffer layer resistivity, the working voltage, the buffer layer allowable longitudinal voltage and the working power supply frequency;
a third calculating unit 232, configured to calculate an allowable distance L of the measured cable according to the parameter; the concrete formula is as follows:
in the formula (1), d1For shielding the cable conductor by the outer diameter d2The outer diameter of the cable insulation layer, delta the thickness of the buffer layer, epsilon the dielectric constant of the cable insulation layer material, rho the resistivity of the buffer layer, U0Working voltage, Us buffer layer allowed longitudinal voltage, f working power frequency. The comparison and evaluation unit 24 is specifically configured to:
comparing the separation length and the allowable distance of the tested cable;
when the separation length is smaller than the allowable distance, evaluating that the tested cable can continue to run;
and when the separation length is greater than or equal to the allowable distance, evaluating that the tested cable is in burning risk.
The embodiment of the present invention provides a cable buffer layer state evaluation system, which can implement the above-mentioned method embodiment, and for specific function implementation, reference is made to the description of the method embodiment, which is not described herein again.
The invention adopts an image recognition mode, so that the judgment of the detection result is more intuitive, and meanwhile, the accuracy of the judgment result is improved by combining the field measurement of the distance between wave crests or wave troughs of the corrugated aluminum sheath. The invention adopts the separation length as a parameter to evaluate the state, and has uniqueness, flexible field application and high detection efficiency.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A cable buffer layer state evaluation method is characterized by comprising the following steps:
acquiring a perspective view of a cable to be tested;
calculating the separation length of the cable to be detected according to the perspective view of the cable to be detected; the disengagement length is:
the actual separation length of the corrugated aluminum protective sleeve and the buffer layer in the tested cable;
calculating the allowable distance of the tested cable according to the parameters of the tested cable; the allowable distance is: the length of the corrugated aluminum protective sleeve and the buffer layer in the tested cable allowed to be separated;
comparing the separation length and the allowable distance of the tested cable to obtain an evaluation result of the tested cable;
according to the perspective view of the measured cable, the separation length of the measured cable is calculated, and the method specifically comprises the following steps:
identifying the part, actually separated from the buffer layer, of the corrugated aluminum protective sleeve in the tested cable according to the perspective view of the tested cable;
calculating the number of wave crests or wave troughs contained in the actually separated part of the corrugated aluminum protective sleeve and the buffer layer in the tested cable;
measuring the distance between two adjacent wave crests or wave troughs;
calculating the separation length of the tested cable according to the distance between two adjacent peaks or troughs and the number of peaks or troughs contained in the actually separated part;
the method for calculating the allowed distance of the tested cable according to the parameters of the tested cable specifically comprises the following steps:
acquiring parameters of a tested cable, wherein the parameters comprise: the cable conductor shielding outer diameter, the cable insulating layer outer diameter, the buffer layer thickness, the cable insulating layer material dielectric constant, the buffer layer resistivity, the working voltage, the buffer layer allowable longitudinal voltage and the working power supply frequency;
calculating the allowable distance L of the tested cable according to the parameters; the concrete formula is as follows:
in the formula (1), d1For shielding the cable conductor by the outer diameter d2The outer diameter of the cable insulation layer, delta the thickness of the buffer layer, epsilon the dielectric constant of the cable insulation layer material, rho the resistivity of the buffer layer, U0Working voltage is adopted, Us is buffer layer allowable longitudinal voltage, and f is working power supply frequency;
the method for obtaining the evaluation result of the tested cable by comparing the separation length and the allowable distance of the tested cable specifically comprises the following steps:
comparing the separation length and the allowable distance of the tested cable;
when the separation length is smaller than the allowable distance, evaluating that the tested cable can continue to run;
and when the separation length is greater than or equal to the allowable distance, evaluating that the tested cable is in burning risk.
2. The method for evaluating the condition of the cable buffer layer according to claim 1, wherein the step of obtaining the perspective view of the tested cable specifically comprises the following steps:
and taking a picture of the inlet wire of the tested cable through a pulse ray machine to obtain an X-ray perspective view of the tested cable.
3. A cable buffer layer condition evaluation system, comprising:
the acquisition unit is used for acquiring a perspective view of the tested cable;
the calculation separation unit is used for calculating the separation length of the cable to be measured according to the perspective view of the cable to be measured; the disengagement length is:
the actual separation length of the corrugated aluminum protective sleeve and the buffer layer in the tested cable;
the calculation allowing unit is used for calculating and obtaining the allowed distance of the tested cable according to the parameters of the tested cable; the allowable distance is: the length of the corrugated aluminum protective sleeve and the buffer layer in the tested cable allowed to be separated;
the comparison evaluation unit is used for comparing the separation length and the allowable distance of the tested cable to obtain an evaluation result of the tested cable;
the calculation detachment unit includes:
the identification module is used for identifying the part, actually separated from the buffer layer, of the corrugated aluminum protective sleeve in the tested cable according to the perspective view of the tested cable;
the first calculation module is used for calculating the number of wave crests or wave troughs contained in the part, actually separated from the buffer layer, of the corrugated aluminum protective sleeve in the tested cable;
the measuring module is used for measuring the distance between two adjacent wave crests or wave troughs;
the second calculation module is used for calculating the separation length of the tested cable according to the distance between two adjacent peaks or troughs and the number of the peaks or the troughs contained in the actually separated part;
the calculation allowing unit includes:
the acquisition module is used for acquiring parameters of the tested cable, and the parameters comprise: the cable conductor shielding outer diameter, the cable insulating layer outer diameter, the buffer layer thickness, the cable insulating layer material dielectric constant, the buffer layer resistivity, the working voltage, the buffer layer allowable longitudinal voltage and the working power supply frequency;
the third calculating unit is used for calculating the allowable distance L of the tested cable according to the parameters; the concrete formula is as follows:
in the formula (1), d1For shielding the cable conductor by the outer diameter d2Is a cable insulatorThe outer diameter of the insulating layer, delta is the thickness of the buffer layer, epsilon is the dielectric constant of the cable insulating layer material, rho is the resistivity of the buffer layer, U0Working voltage is adopted, Us is buffer layer allowable longitudinal voltage, and f is working power supply frequency;
the comparison and evaluation unit is specifically configured to:
comparing the separation length and the allowable distance of the tested cable;
when the separation length is smaller than the allowable distance, evaluating that the tested cable can continue to run;
and when the separation length is greater than or equal to the allowable distance, evaluating that the tested cable is in burning risk.
4. The cable buffer layer state evaluation system according to claim 3, wherein the obtaining unit is specifically configured to:
and taking a picture of the inlet wire of the tested cable through a pulse ray machine to obtain an X-ray perspective view of the tested cable.
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| CN111596179A (en) * | 2020-05-25 | 2020-08-28 | 国网湖南省电力有限公司 | Cable buffer layer defect live detection method, system, medium and equipment based on digital imaging technology |
| CN111830378B (en) * | 2020-07-23 | 2021-05-07 | 四川大学 | Rotary stepping type cable buffer layer ablation fault simulation device and method |
| CN111929544B (en) * | 2020-07-23 | 2021-05-07 | 四川大学 | Cable buffer layer ablation fault simulation device and method with adjustable current and surface pressure |
| CN112782526B (en) * | 2020-12-28 | 2022-11-08 | 国网天津市电力公司电力科学研究院 | Method for screening ablation hidden danger cable sections of buffer layer based on inner surface area of corrugated sheath |
| CN112763851B (en) * | 2020-12-28 | 2022-10-14 | 国网天津市电力公司电力科学研究院 | Method for rapidly screening ablation hidden danger cable section based on inner surface area of corrugated sheath |
| CN112763850B (en) * | 2020-12-28 | 2022-10-11 | 国网天津市电力公司电力科学研究院 | Buffer layer ablation hidden danger cable segment screening method based on buffer layer external surface area |
| CN112763849B (en) * | 2020-12-28 | 2022-10-14 | 国网天津市电力公司电力科学研究院 | Rapid ablation hidden danger cable section screening method based on buffer layer external surface area |
| CN113406392B (en) * | 2021-06-16 | 2022-05-03 | 国网安徽省电力有限公司电力科学研究院 | Resistance measuring device and resistance measuring method in cable buffer layer ablation process |
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