CN114062855B - Power cable degradation detection device and method thereof - Google Patents
Power cable degradation detection device and method thereof Download PDFInfo
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- CN114062855B CN114062855B CN202011048963.0A CN202011048963A CN114062855B CN 114062855 B CN114062855 B CN 114062855B CN 202011048963 A CN202011048963 A CN 202011048963A CN 114062855 B CN114062855 B CN 114062855B
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- 230000015556 catabolic process Effects 0.000 title claims abstract description 30
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 30
- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title abstract description 11
- 238000003745 diagnosis Methods 0.000 claims abstract description 18
- 238000004458 analytical method Methods 0.000 claims abstract description 12
- 230000007547 defect Effects 0.000 claims description 51
- 230000035515 penetration Effects 0.000 claims description 11
- 230000006870 function Effects 0.000 claims description 5
- 230000006866 deterioration Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 description 5
- 240000005572 Syzygium cordatum Species 0.000 description 4
- 235000006650 Syzygium cordatum Nutrition 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000003413 degradative effect Effects 0.000 description 1
- 238000012631 diagnostic technique Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
-
- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
-
- 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
- G01R31/1209—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 using acoustic 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
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Locating Faults (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention relates to a power cable degradation detection device and a method thereof. The power cable degradation detection device of the present invention includes a memory storing a power cable degradation detection program and a processor executing the program, and the processor performs pulse propagation characteristic analysis by constituting a diagnosis pulse train including a plurality of short pulses having different sizes and widths.
Description
Technical Field
The invention relates to a power cable degradation detection device and a method thereof.
Background
Most of the power cable degradation detection uses a part of the anti-electric detection, but this has a problem that it is difficult to provide higher reliability when diagnosing defects to the main insulation layer of the cable.
In the prior art, pulse propagation characteristic analysis has been attempted, but there is a problem that it is difficult to obtain information about the specific progress state of defects such as the size and penetration depth of defects generated in a cable.
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a power cable degradation detection device and method that can obtain specific progress status information concerning a cable defect by using reflection characteristics while constituting a diagnostic pulse.
Means for solving the problems
The power cable degradation detection device of the present invention includes a memory storing a power cable degradation detection program and a processor executing the program, and the processor performs pulse propagation characteristic analysis by constructing a diagnosis pulse train including a plurality of short pulses having different sizes and widths.
The processor applies diagnostic bursts of sequentially varying size and width over a preset time interval.
The diagnostic pulse train has a pattern in which the size and the width sequentially increase.
The time interval is set according to the diagnosis target cable length and the pulse traveling speed.
The processor analyzes the set of reflected waves detected in time sequence to detect defect information within the cable.
The processor uses the reflected wave form to estimate the defect size of the cable.
The processor uses the magnitude of the reflected wave to infer the depth of penetration of the defect in the cable.
Effects of the invention
According to the embodiment of the invention, a series of diagnosis pulse strings with the pulse size (h) and the pulse width (w) changing sequentially with a certain time interval (t) are formed, and the characteristics of the reflection wave group are analyzed to diagnose the cable defect, thereby solving the problem of the pulse propagation characteristic analysis method using the diagnosis pulse with the short pulse form in the prior art.
By using the diagnosis pulse in the form of a short pulse, a cable defect (specific information about the progress of the defect) which cannot be detected can be detected.
The distribution size of defects in the cable can be predicted using the morphology of the reflected wave formed.
The penetration depth of defects in the cable can be predicted using the reflected wave size embodied for a particular pulse width.
The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned herein will be clearly understood by those skilled in the art from the following.
Drawings
Fig. 1 shows the principle of a pulse propagation characteristic analysis method according to the prior art.
Fig. 2 shows a structure of a short pulse according to the prior art.
Fig. 3 and 4 show a power cable degradation detection device according to an embodiment of the present invention.
Fig. 5 shows a signal-to-noise ratio (SN ratio) of the reflected wave size ratio with respect to an embodiment of the present invention.
Fig. 6 shows the structure of a diagnostic pulse train according to an embodiment of the present invention.
Fig. 7 shows the structure of a diagnostic pulse train applied to a cable including two defects according to an embodiment of the present invention.
Fig. 8 shows a power cable degradation detection method according to an embodiment of the present invention.
Detailed Description
The above objects and other objects and advantages and features of the present invention, and the method of achieving the objects and advantages and features thereof, will be clearly understood by referring to the embodiments described in detail below together with the accompanying drawings.
However, the present invention is not limited to the embodiments disclosed below, and may be embodied in various forms, but the following embodiments are provided for the purpose of easily informing a person skilled in the art of the objects, structures, and effects of the present invention, and the scope of the claims of the present invention is defined by the description of the claims.
On the other hand, the terms used in the present specification are used only for the description of the embodiments, and do not limit the present invention. In this specification, where no particular mention is made herein, the singular includes the plural. As used in this specification, "comprises," "comprising," and/or "includes" mean that the elements, steps, actions, and/or components recited do not preclude the presence or addition of one or more other elements, steps, actions, and/or components.
In the following, in order to assist the person skilled in the art in understanding the invention, a description will be given first of the background of the invention and then of a preferred embodiment of the invention.
Most cable defects occur due to electrical, mechanical, degradative, chemical stresses, with water tree being a representative cable degradation phenomenon.
The failure of the power cable due to the degradation of the water tree causes a power outage, resulting in a large economic cost for repair and restoration.
Accordingly, there is a need to develop an effective cable diagnostic technique that can detect cable defects, such as water trees, formed within the main insulation of a power cable.
In the conventional power cable live diagnosis, a part of the anti-electric detection method is used in most cases, but this has a problem that it is difficult to provide high reliability when diagnosing defects occurring in the main insulating layer of the cable.
In addition, according to the conventional technique, a pulse propagation characteristic analysis method has been proposed in which a diagnostic pulse is applied to a cable, and reflected waves at discontinuous impedance positions generated by defects such as a water tree in the cable are analyzed in a time zone, and fig. 1 shows the principle of the pulse propagation characteristic analysis method of the conventional technique.
As shown in fig. 2, the diagnostic pulse in the form of a short pulse used in the pulse propagation characteristic analysis method makes it possible to roughly grasp positional information of defects occurring in the cable, but it is difficult to obtain specific progress state information of defects such as the size of the defects and the penetration depth.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a power cable degradation detection device and a method for analyzing reflection characteristics and diagnosing cable defects by constituting a series of diagnostic pulse trains whose sizes (h) and widths (w) are sequentially changed with a predetermined time interval.
Fig. 3 and 4 show a power cable degradation detection device according to an embodiment of the present invention.
The power cable degradation detection device according to an embodiment of the present invention includes a memory 110 storing a power cable degradation detection program and a processor 120 executing the program, and the processor 120 performs pulse propagation characteristic analysis by constituting a diagnosis pulse train including a plurality of short pulses having different sizes and widths.
The processor 120 applies diagnostic bursts of sequentially varying size and width over a preset time interval.
The diagnostic pulse train has a pattern in which the size and the width sequentially increase.
The time interval is set according to the diagnosis target cable length and the pulse traveling speed.
The processor 120 analyzes the set of reflected waves detected in time series to detect defect information within the cable.
The processor 120 uses the reflected wave pattern to estimate the defect size of the cable.
The processor 120 uses the magnitude of the reflected wave to infer the depth of penetration of the defect in the cable.
According to an embodiment of the present invention, the effect of the size (h) and width (w) of the diagnostic pulse applied to a specific cable defect on the size of the reflected wave is quantitatively analyzed.
The signal generating section 420 and the detecting section 410 for generating a diagnosis pulse are provided at the input end of the cable including a specific defect in order to detect the reflected wave characteristics, and the impedance matching section 430 is provided between the signal generating section 420 and the inner conductor C1 of the cable.
The cable comprises an inner conductor C1, a main insulation layer C2 and an outer conductor C3.
As one example, the size (h) of the diagnostic pulse in the form of a short pulse was set to 100V, 500V, and 1kV, the width (w) of the pulse was set to 10ns, 20ns, and 30ns, and an experiment was performed by constructing 9 pulse combinations according to the Taguchi (Taguchi) experimental plan method composed of 2-factor 3 levels.
As the performance factor detected from the experimental combination of the respective diagnostic pulses, the ratio of the magnitudes of the pulses applied with respect to the maximum magnitude of the detected reflected wave is selected as a percentage, and the larger the performance factor is, the better the expected large characteristic function is set.
Fig. 5 shows a signal-to-noise ratio (SN ratio) of the relative reflected wave size ratio according to an embodiment of the present invention.
According to the embodiment of the invention, the signal-to-noise ratio (SN ratio) characteristic is derived from the results of analyzing 9 experimental combinations constructed according to the Tian Koushi experimental planning method, and it is known that the smaller the size of the diagnosis pulse, the larger the width of the diagnosis pulse and the higher the sensitivity for the same defect.
That is, it is understood that the magnitude and width of the diagnostic pulse applied to the same cable defect greatly affect the magnitude of the reflected wave generated in the cable according to the defect.
According to an embodiment of the present invention, a series of diagnostic pulse trains of which the sizes (h) and widths (w) are sequentially changed are configured, and accurate positional information about defects occurring in a cable, and progress information about defects such as the size of the defects and penetration depth are predicted.
Fig. 6 shows the structure of a diagnostic pulse train according to an embodiment of the present invention.
Diagnostic pulses (P) consisting of a preset number (i) i ) In the group, pulse size (h i ) And pulse width (w) i ) Gradually increases as follows [ equation 1]]The interval (t) between pulses is shown to be determined by the length (l) of the cable to be diagnosed.
[ number 1]
Referring to fig. 6, the pulse increasing trend shown by the dotted line is in the form of a logarithmic function or a polynomial function.
Fig. 7 shows the structure of a diagnostic pulse train applied to a cable including two defects according to an embodiment of the present invention.
In the case where the diagnostic pulse train of the embodiment of the present invention is applied to a cable including two defects (defect 1, defect 2), the characteristics of the reflected waves are shown differently depending on the characteristics of the respective defects (the size of the distribution defect and the penetration depth) by the size and width of the pulses constituting the diagnostic pulse train.
According to an embodiment of the present invention, in order to effectively analyze the reflected wave groups detected in time series, overlapping is arranged to the same defect position.
Referring to fig. 7, in the case of defect 1, the pulse (P 1 ) A large reflected wave occurs, and in the case of defect 2, a signal is generated in the diagnostic pulse (P i ) A larger reflected wave occurs.
According to the embodiment of the present invention, regarding the distribution size of defects, the form of reflected waves formed for the same defects is estimated.
According to an embodiment of the present invention, regarding the penetration depth of a defect, it is estimated by using the magnitude of reflected waves reflected for a specific pulse width.
Fig. 8 shows a power cable degradation detection method according to an embodiment of the present invention.
The power cable degradation detection method of the embodiment of the invention comprises the following steps: a step (S810) of setting a diagnosis pulse including a plurality of short pulses having different sizes and widths for performing pulse propagation characteristic analysis, and applying the diagnosis pulse, and a step (S820) of detecting degradation of the power cable by using the result of the pulse propagation characteristic analysis.
(S810) setting diagnostic pulses of which the size and width are sequentially changed at predetermined time intervals.
The size and width of the diagnostic pulse are increased in sequence.
The time interval is set according to the length of the cable to be diagnosed and the pulse traveling speed.
In the step (S820), the defect size of the power cable is estimated using the form of the reflected wave.
In the step (S820), the depth of penetration of the defect in the power cable is estimated using the magnitude of the reflected wave.
On the other hand, the power cable degradation detection method of the embodiment of the present invention is embodied in a computer system or recorded on a recording medium. The computer system includes at least one or more processors and memory and user input devices and data communication buses and user output devices and storage compartments. The above-described respective constituent elements perform data communication via a data communication bus.
The computer system also includes a network interface coupled to the network. The processor is a central processing unit (central processing unit CPU) or a semiconductor device that processes commands stored in the memory and/or the storage room.
The memory and storage chambers include various forms of volatile or nonvolatile storage media. For example, the memory includes ROM and RAM.
Accordingly, the power cable degradation detection method of the embodiments of the present invention may be embodied as a computer-executable method. The power cable degradation detection method of the embodiment of the present invention is executed by a computer-readable command language when executed in a computer device.
On the other hand, the power cable degradation detection method of the present invention described above may be embodied as computer-readable code in a recording medium readable by a computer. As the computer-readable recording medium, all kinds of recording media storing data interpretable by a computer system are included. Such as ROM (Read Only Memory), RAM (Random Access Memory: random access Memory), magnetic tape, magnetic disk, flash Memory, optical data storage device, etc. In addition, the recording medium readable by the computer is distributed to computer systems connected through a computer communication network, and the codes readable as a distributed manner are stored and executed.
The above description has been given mainly of the embodiments of the present invention. Those skilled in the art can embody the invention in its modified forms without departing from the essential characteristics thereof. Accordingly, the disclosed embodiments are not limiting of the invention, but are merely illustrative of the invention. The scope of the invention is not limited by the foregoing description but is defined by the claims, and all differences within the same scope will be construed as being included in the present invention.
Claims (4)
1. A power cable degradation detection device, comprising:
a memory storing a power cable degradation detection program; and
A processor, which executes the above-described program,
the processor forms a diagnosis pulse train including a plurality of short pulses sequentially increasing in size and width in a logarithmic function form with a predetermined time interval therebetween to perform pulse propagation characteristic analysis,
the processor analyzes the set of reflected waves detected in time sequence to detect defect information within the cable,
the processor estimates a defect size in the cable using a reflected wave pattern that is reflected by a specific diagnostic pulse width of the plurality of diagnostic pulses, and estimates a defect penetration depth in the cable using a reflected wave pattern that is reflected by a specific diagnostic pulse width of the plurality of diagnostic pulses.
2. The power cable degradation detection device according to claim 1, wherein,
the above-mentioned time interval is set according to the diagnosis target cable length and the pulse traveling speed.
3. A power cable degradation detection method comprising the steps of:
(a) Setting a diagnosis pulse including a plurality of short pulses sequentially increasing in size and width in a logarithmic function form with a predetermined time interval therebetween for analyzing pulse propagation characteristics, and applying the diagnosis pulse; and
(b) The deterioration of the power cable is detected by using the result of analyzing the above pulse propagation characteristics,
in the step (b), the defect size in the cable is estimated using the form of the reflected wave that is reflected at the specific diagnostic pulse width of the plurality of diagnostic pulses, and the defect penetration depth in the cable is estimated using the size of the reflected wave that is reflected at the specific diagnostic pulse width of the plurality of diagnostic pulses.
4. The power cable degradation detection method according to claim 3, wherein,
the time interval is set according to the length of the cable to be diagnosed and the pulse traveling speed.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020200098240A KR102455682B1 (en) | 2020-08-05 | 2020-08-05 | Apparatus and method for detecting deterioration of a powercable |
| KR10-2020-0098240 | 2020-08-05 |
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| CN114062855A CN114062855A (en) | 2022-02-18 |
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| CN117517902B (en) * | 2023-12-06 | 2024-08-06 | 西南交通大学 | XLPE cable insulation damage state assessment method based on pulse signal transmission factor |
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2020
- 2020-08-05 KR KR1020200098240A patent/KR102455682B1/en active IP Right Grant
- 2020-09-29 CN CN202011048963.0A patent/CN114062855B/en active Active
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| KR102455682B1 (en) | 2022-10-17 |
| KR20220017789A (en) | 2022-02-14 |
| CN114062855A (en) | 2022-02-18 |
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