CN113933755A - Cable defect determining method, device, equipment, storage medium and processor - Google Patents
Cable defect determining method, device, equipment, storage medium and processor Download PDFInfo
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- CN113933755A CN113933755A CN202111407020.7A CN202111407020A CN113933755A CN 113933755 A CN113933755 A CN 113933755A CN 202111407020 A CN202111407020 A CN 202111407020A CN 113933755 A CN113933755 A CN 113933755A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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Abstract
The invention discloses a method, a device, equipment, a storage medium and a processor for determining cable defects, wherein the method for determining the cable defects comprises the following steps: acquiring current information of a metal shielding layer when the cable works under a preset voltage; determining harmonic component information corresponding to each subharmonic component contained in the current information; and determining the defect condition of the cable according to the information of the harmonic components. The cable defect determining method solves the problem of inconvenient cable defect determining operation in the prior art.
Description
Technical Field
The invention relates to the field of cable defect detection, in particular to a method, a device, equipment, a storage medium and a processor for determining cable defects.
Background
When the power cable is used, with the increase of the operation life, under the influence of a plurality of factors such as electricity, heat, machinery, chemistry and the like, the cable has faults such as insulation degradation, stress failure and the like, and the safe operation of a power system is threatened. Therefore, jack-up is important to detect cable defects.
In the prior art, the cable defect detection method has fewer modes, and the means capable of realizing online detection is more lacking, so that the operation is more complicated when the cable defect detection is carried out, and the sensitivity cannot be ensured. Therefore, there is a problem in the prior art that the cable defect determining operation is inconvenient.
In view of the above problems, no effective solution has been proposed.
The above information disclosed in the background section is only for enhancement of understanding of the background of the technology described herein. The background art may therefore contain certain information that does not form the known prior art to those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a method, a device, equipment, a storage medium and a processor for determining cable defects, which are used for at least solving the problem of inconvenient operation of determining the cable defects in the prior art.
In order to achieve the above object, according to a first aspect of embodiments of the present invention, there is provided a cable defect determining method including: acquiring current information of a metal shielding layer when the cable works under a preset voltage; determining harmonic component information corresponding to each subharmonic component contained in the current information; and determining the defect condition of the cable according to the information of the harmonic components.
Further, determining harmonic component information corresponding to each harmonic component contained in the current information includes: and determining harmonic component information corresponding to each subharmonic component through fast Fourier transform according to the current information.
Further, determining the defect condition of the cable according to the information of the plurality of harmonic components, comprising: and determining one preset defect condition matched with the harmonic component information in the preset defect conditions as the defect condition of the cable.
Further, the defect types and the defect severity degrees corresponding to the plurality of preset defect conditions are different.
Further, the harmonic component information is the proportion information of each corresponding harmonic component in the total harmonic.
Further, before determining the defect condition of the cable according to the information of the plurality of harmonic components, the cable defect determining method further comprises the following steps: and acquiring a plurality of harmonic component information of the test cable with each preset defect condition when the test cable works under a preset voltage.
Further, before obtaining information of a plurality of harmonic components when the test cable of each preset defect condition works at a predetermined voltage, the cable defect determining method further comprises: and placing the test cable in a vacuum drying environment at a preset temperature for drying for a preset time.
According to a second aspect of embodiments of the present invention, there is provided a cable defect determining apparatus including: the acquisition unit is used for acquiring current information of the metal shielding layer when the cable works under a preset voltage; a first determining unit that determines harmonic component information corresponding to each sub-harmonic component included in the current information; and the second determining unit is used for determining the defect condition of the cable according to the plurality of harmonic component information.
According to a third aspect of the embodiments of the present invention, there is provided a nonvolatile storage medium including a stored program, wherein a device in which the nonvolatile storage medium is controlled to execute the above-described cable defect determining method when the program is executed.
According to a fourth aspect of the embodiments of the present invention, there is provided a processor for executing a program, wherein the program executes to perform the cable defect determining method described above.
According to a fifth aspect of the embodiments of the present invention, there is provided a cable defect determining apparatus, including a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the cable defect determining method described above when executing the computer program.
Further, the cable defect determining apparatus further includes: the first end of the sampling resistor is grounded, and the second end of the sampling resistor is connected with the metal shielding layer of the cable; and the amplifying module is connected with the sampling resistor to amplify the current information acquired by the sampling resistor.
The cable defect determining method applying the technical scheme of the invention comprises the following steps: acquiring current information of a metal shielding layer when the cable works under a preset voltage; determining harmonic component information corresponding to each subharmonic component contained in the current information; and determining the defect condition of the cable according to the information of the harmonic components. The method comprises the steps of determining harmonic component information corresponding to each subharmonic component contained in the current information of a metal shielding layer when the cable works under a preset voltage, and determining the defect condition of the cable according to the harmonic component information. Under the condition that the cable defects are different, the harmonic component information corresponding to each subharmonic component is different, so that the defect condition corresponding to the cable can be accurately determined according to the harmonic component information, the cable defects can be conveniently determined, online detection can be realized by adopting the defect determining method, the cable defect determining method is enriched, and the problem that the cable defects are inconvenient to determine in the prior art is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic flow chart diagram of an alternative embodiment of a cable defect determination method in accordance with the present invention;
FIG. 2 is a schematic view of an alternative embodiment of a cable defect determining apparatus according to the present invention;
fig. 3 is a schematic view of an alternative embodiment of a cable defect determining apparatus according to the present invention.
Wherein the figures include the following reference numerals:
10. a cable; 100. sampling a resistor; 200. an amplifying module; 300. a data acquisition card; 400. a computer terminal; 500. a transformer.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.
Fig. 1 is a cable defect determining method according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:
step S102, acquiring current information of a metal shielding layer when the cable works under a preset voltage;
step S104, determining harmonic component information corresponding to each subharmonic component contained in the current information;
and step S106, determining the defect condition of the cable according to the plurality of harmonic component information.
The cable defect determining method adopting the scheme comprises the following steps: acquiring current information of a metal shielding layer when the cable works under a preset voltage; determining harmonic component information corresponding to each subharmonic component contained in the current information; and determining the defect condition of the cable according to the information of the harmonic components. The method comprises the steps of determining harmonic component information corresponding to each subharmonic component contained in the current information of a metal shielding layer when the cable works under a preset voltage, and determining the defect condition of the cable according to the harmonic component information. Under the condition that the cable defects are different, the harmonic component information corresponding to each subharmonic component is different, so that the defect condition corresponding to the cable can be accurately determined according to the harmonic component information, the cable defects can be conveniently determined, online detection can be realized by adopting the defect determining method, the cable defect determining method is enriched, and the problem that the cable defects are inconvenient to determine in the prior art is solved.
Specifically, determining harmonic component information corresponding to each harmonic component included in the current information includes: and determining harmonic component information corresponding to each subharmonic component through fast Fourier transform according to the current information.
In the embodiment, after the current information of the metal shielding layer when the cable works under the preset voltage is obtained, the harmonic component information corresponding to each subharmonic component is obtained by adopting Fourier decomposition, so that the subsequent determination of the cable defect is facilitated. The current flowing in the cable is formed by superposing a direct current component and a plurality of periodic current components with different frequencies. Thus, a fast fourier decomposition of the measured cable current can be performed, which can be expressed in a fourier series as:
n is the harmonic order, InIs the magnitude of the nth harmonic current,
is the initial phase angle of the nth harmonic current. When n is 1, a fundamental component is represented. To cable total current amplitude IaAnd total harmonic current amplitude IhAnd solving, wherein the calculation formula is as follows:
therefore, the ratio of the harmonic currents of each order under different defects of the cable can be obtained, and is expressed by H (%) in the application as follows:
wherein, InIs the amplitude of each harmonic current.
Specifically, determining the defect condition of the cable according to the information of the harmonic components comprises the following steps: and determining one preset defect condition matched with the harmonic component information in the preset defect conditions as the defect condition of the cable.
That is, in the process of determining the defect condition of the cable according to the plurality of harmonic component information, the plurality of harmonic component information are compared with the plurality of harmonic component information of each preset defect condition, and when the harmonic component information and the harmonic component information are matched with each other, the preset defect condition is determined to be the defect condition corresponding to the cable. Of course, the matching here may be determined according to different criteria according to actual requirements, the two criteria may be completely consistent, or the two criteria may be determined to be matched when the similarity of the two criteria reaches a certain threshold.
The defect types and the defect severity degrees corresponding to the plurality of preset defect conditions are different. That is to say, the defect condition of the cable may include a defect type of the cable and a severity of the defect, for example, the defect type of the cable may be an insulation cut defect, an outer semiconductive layer suspension discharge defect, different defect types correspond to different defect conditions, of course, even if the defect types are the same, the severity of the defect may also be different, and finally, the corresponding information of each harmonic component is different no matter the defect types are different or the severity of the defect is different, so that the defect type and the severity of the defect can be accurately determined according to the information of each harmonic component.
Specifically, the harmonic component information is the proportion information of the corresponding each harmonic component in the total harmonic.
Under the condition that the defect conditions of the cable are different, the occupation proportion of each subharmonic component in the total harmonic is also different, and the defect condition of the cable can be determined more conveniently and reliably according to the occupation proportion information of each subharmonic component in the total harmonic.
Before determining the defect condition of the cable according to the plurality of harmonic component information, the cable defect determining method further comprises the following steps: and acquiring a plurality of harmonic component information of the test cable with each preset defect condition when the test cable works under a preset voltage.
That is to say, the plurality of harmonic component information corresponding to each preset condition is obtained by testing in advance, that is, the test cable with various defect conditions is adopted to work under a preset voltage, and the corresponding plurality of harmonic component information is obtained, so that the plurality of harmonic component information corresponding to various defect conditions can be determined, and the defect condition of the cable can be accurately determined according to the harmonic component information in the subsequent process.
Specifically, before obtaining information of a plurality of harmonic components when the test cable of each preset defect condition works at a predetermined voltage, the cable defect determining method further includes: and placing the test cable in a vacuum drying environment at a preset temperature for drying for a preset time.
In this embodiment, before testing the test cable, can adopt the vacuum drying environment of predetermineeing the temperature earlier to carry out the drying to the test cable, make it dry for a predetermined time, this is favorable to eliminating the mechanical stress that the test cable produced at the section in-process to guarantee the accuracy that data acquireed. In this example, the temperature was kept at 25 ℃ during the experiment, and the experimental voltage was 8.7kV AC. Before the experiment, all cable samples are placed in a vacuum drying oven at 70 ℃ for constant-temperature drying for 24 hours, so that the mechanical stress generated in the slicing process is effectively eliminated.
Next, as shown in fig. 2, an embodiment of the present invention further provides a cable defect determining apparatus, including: the acquisition unit is used for acquiring current information of the metal shielding layer when the cable works under a preset voltage; a first determining unit that determines harmonic component information corresponding to each sub-harmonic component included in the current information; and the second determining unit is used for determining the defect condition of the cable according to the plurality of harmonic component information.
The first determination unit is configured to: and determining harmonic component information corresponding to each subharmonic component through fast Fourier transform according to the current information.
The second determination unit is configured to: and determining one preset defect condition matched with the harmonic component information in the preset defect conditions as the defect condition of the cable.
Specifically, the defect types and the defect severity degrees corresponding to a plurality of preset defect conditions are different; the harmonic component information is the proportion information of each corresponding harmonic component in the total harmonic.
Specifically, before determining the defect condition of the cable according to the plurality of harmonic component information, the cable defect determining device further comprises an information acquiring unit, wherein the information acquiring unit is used for acquiring the plurality of harmonic component information when the test cable with each preset defect condition works under a preset voltage.
Before obtaining the information of a plurality of harmonic components when the test cable works under the preset voltage under each preset defect condition, the cable defect determining device further comprises a drying unit, wherein the drying unit is used for placing the test cable in a vacuum drying environment at the preset temperature for drying for a preset time.
In addition, the embodiment of the invention also provides a nonvolatile storage medium, the nonvolatile storage medium comprises a stored program, and when the program runs, the device where the nonvolatile storage medium is located is controlled to execute the cable defect determining method.
The embodiment of the invention further provides a processor, which is used for running the program, wherein the program runs to execute the cable defect determining method.
Finally, an embodiment of the present invention further provides a cable defect determining apparatus, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the cable defect determining method when executing the computer program.
As shown in fig. 3, the cable defect determining apparatus of the embodiment of the present invention further includes: a sampling resistor 100, wherein a first end of the sampling resistor 100 is grounded, and a second end of the sampling resistor is used for being connected with a metal shielding layer of the cable 10; and the amplifying module 200, the amplifying module 200 is connected with the sampling resistor 100 to amplify the current information collected by the sampling resistor 100.
The cable defect determining apparatus further includes a data acquisition card 300 and a computer terminal 400, the data acquisition card 300 is connected to the amplifying module 200 to receive the current information amplified by the amplifying module 200, and the computer terminal 400 is connected to the data acquisition card 300 to receive the current information and determine the defect condition of the cable 10 according to the current information.
In addition, the cable defect determining apparatus further includes a transformer 500, and a higher test voltage may be generated through the transformer 500, thereby conveniently obtaining a plurality of harmonic component information when the test cable of each preset defect condition operates at a predetermined voltage. The 220V alternating current can generate 0-50 kV high voltage through the voltage regulator, the transformer 500 and the protective resistor, and is responsible for providing high voltage for the cable 10; the sampling resistor 100 is a precision non-inductive resistor, and during an experiment, the sampling resistor 100 acquires a harmonic signal from a metal shielding layer ground wire of the cable 10, and stores data into the computer terminal 400 after the harmonic signal is processed by the amplifying module 200 and the data acquisition card 300.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. Moreover, the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions, and while a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than here.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (12)
1. A cable defect determination method, comprising:
acquiring current information of a metal shielding layer when the cable works under a preset voltage;
determining harmonic component information corresponding to each harmonic component contained in the current information;
and determining the defect condition of the cable according to the harmonic component information.
2. The method for determining a cable defect according to claim 1, wherein determining harmonic component information corresponding to each harmonic component included in the current information includes:
and determining the harmonic component information corresponding to each subharmonic component through fast Fourier transform according to the current information.
3. The method for determining the defect of the cable according to claim 1, wherein determining the defect condition of the cable according to the plurality of harmonic component information comprises:
and determining one preset defect condition matched with the harmonic component information in a plurality of preset defect conditions as the defect condition of the cable.
4. The cable defect determining method of claim 3, wherein the predetermined defect conditions are different in corresponding defect type and defect severity.
5. The cable defect determination method of claim 3, wherein the harmonic component information is a ratio information of the respective sub-harmonic components in a total harmonic.
6. The cable defect determination method of claim 3, wherein prior to determining the defect condition of the cable based on the plurality of harmonic component information, the cable defect determination method further comprises:
and acquiring a plurality of pieces of harmonic component information of each test cable with the preset defect condition when the test cable works under the preset voltage.
7. The cable defect determination method of claim 6, wherein prior to obtaining a plurality of the harmonic component information for a test cable operating at the predetermined voltage for each of the predetermined defect conditions, the cable defect determination method further comprises:
and placing the test cable in a vacuum drying environment at a preset temperature for drying for a preset time.
8. A cable defect determining apparatus, comprising:
the acquisition unit is used for acquiring current information of the metal shielding layer when the cable works under a preset voltage;
a first determining unit that determines harmonic component information corresponding to each of the harmonic components included in the current information;
and the second determining unit is used for determining the defect condition of the cable according to the harmonic component information.
9. A non-volatile storage medium, comprising a stored program, wherein the program, when executed, controls a device in which the non-volatile storage medium is located to perform the cable defect determining method according to any one of claims 1 to 7.
10. A processor, characterized in that the processor is configured to run a program, wherein the program is configured to perform the cable fault determination method according to any one of claims 1 to 7 when running.
11. A cable defect determining apparatus comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the cable defect determining method of any one of claims 1 to 7 when executing the computer program.
12. The cable defect determining apparatus according to claim 11, further comprising:
the first end of the sampling resistor is grounded, and the second end of the sampling resistor is connected with the metal shielding layer of the cable;
and the amplifying module is connected with the sampling resistor so as to amplify the current information acquired by the sampling resistor.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH314764A (en) * | 1952-07-25 | 1956-06-30 | British Insulated Callenders | Process for the production of an impregnated, paper-insulated electrical cable |
| JPH03172777A (en) * | 1989-12-01 | 1991-07-26 | Mitsubishi Cable Ind Ltd | Diagnostic method for insulation deterioration of cv cable |
| CN109272257A (en) * | 2018-11-02 | 2019-01-25 | 国网山西省电力公司电力科学研究院 | A kind of electric cable stoppage appraisal procedure and system based on higher hamonic wave database |
| CN111044860A (en) * | 2019-12-19 | 2020-04-21 | 国网北京市电力公司 | Method and device for analyzing insulation defect of cable body, storage medium and processor |
-
2021
- 2021-11-24 CN CN202111407020.7A patent/CN113933755A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH314764A (en) * | 1952-07-25 | 1956-06-30 | British Insulated Callenders | Process for the production of an impregnated, paper-insulated electrical cable |
| JPH03172777A (en) * | 1989-12-01 | 1991-07-26 | Mitsubishi Cable Ind Ltd | Diagnostic method for insulation deterioration of cv cable |
| CN109272257A (en) * | 2018-11-02 | 2019-01-25 | 国网山西省电力公司电力科学研究院 | A kind of electric cable stoppage appraisal procedure and system based on higher hamonic wave database |
| CN111044860A (en) * | 2019-12-19 | 2020-04-21 | 国网北京市电力公司 | Method and device for analyzing insulation defect of cable body, storage medium and processor |
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