CN114062855A - Power cable degradation detection device and method thereof - Google Patents
Power cable degradation detection device and method thereof Download PDFInfo
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- CN114062855A CN114062855A CN202011048963.0A CN202011048963A CN114062855A CN 114062855 A CN114062855 A CN 114062855A CN 202011048963 A CN202011048963 A CN 202011048963A CN 114062855 A CN114062855 A CN 114062855A
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- 230000015556 catabolic process Effects 0.000 title claims abstract description 31
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title abstract description 13
- 238000004458 analytical method Methods 0.000 claims abstract description 12
- 230000006866 deterioration Effects 0.000 claims abstract description 11
- 230000007547 defect Effects 0.000 claims description 51
- 230000035515 penetration Effects 0.000 claims description 11
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- 238000003745 diagnosis Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
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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
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
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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
- G01R31/08—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
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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
- G01R31/1209—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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- 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 deterioration detection device of the present invention includes a memory storing a power cable deterioration detection program and a processor executing the program, and the processor constitutes a diagnostic pulse train including a plurality of short pulses different in size and width to perform pulse propagation characteristic analysis.
Description
Technical Field
The invention relates to a power cable degradation detection device and a method thereof.
Background
Most of the power cable deterioration detection uses a part of the electricity-proof detection, but this has a problem that it is difficult to provide high reliability when diagnosing a defect in the main insulation layer of the cable.
According to the prior art, pulse propagation characteristic analysis methods have been attempted, but there is a problem that it is difficult to obtain information on the specific progression state of a defect, such as the size and penetration depth of the defect occurring 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 apparatus and method that can obtain specific progress status information regarding a cable defect by constituting a diagnostic pulse and using reflection characteristics.
Means for solving the problems
The power cable deterioration detection device of the present invention includes a memory storing a power cable deterioration detection program and a processor executing the program, and the processor constitutes a diagnostic pulse train including a plurality of short pulses different in size and width to perform pulse propagation characteristic analysis.
The processor applies a diagnostic pulse train of sequentially varying size and width at preset time intervals.
The diagnostic pulse train has a form in which the size and width increase in order.
The time interval is set according to the length of the cable to be diagnosed and the pulse traveling speed.
The processor analyzes the group of reflected waves detected in time series to detect defect information within the cable.
The processor estimates the size of the defect in the cable by using the form of the reflected wave.
The processor uses the size of the reflected wave to estimate the depth of penetration of the cable for the defect.
Effects of the invention
According to the embodiment of the present invention, the problem of the pulse propagation characteristic analysis method using a diagnostic pulse in a short pulse form in the prior art is solved by constructing a series of diagnostic pulse trains in which the size (h) and width (w) of pulses are sequentially changed at a constant time interval (t) and analyzing the characteristics of the reflected wave group to diagnose a cable defect.
With the diagnostic pulse in the form of a short pulse, an undetectable cable defect (specific information about the progress of the defect) can be detected.
The distribution size of the defects in the cable can be predicted by using the form of the formed reflected wave.
The depth of penetration of a defect within the cable can be predicted using the size of the reflected wave reflected 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 can 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 of the prior art.
Fig. 2 shows a structure of a short pulse according to the conventional technique.
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 a reflected wave size ratio with respect to an embodiment of the present invention.
Fig. 6 shows the structure of a diagnostic burst according to an embodiment of the present invention.
Figure 7 shows the structure of a diagnostic pulse train applied to a cable comprising 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, other objects, advantages and features of the present invention, and methods for attaining the objects, advantages and features thereof will be readily apparent from the following detailed description of the embodiments taken in conjunction with the accompanying drawings.
However, the present invention is not limited to the embodiments disclosed below, and may be embodied in various forms different from each other, but the following embodiments are provided to easily inform the object, structure, and effect of the present invention to those skilled in the art, and the scope 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 describing examples, and do not limit the present invention. In this specification, the singular expressions include a plurality of cases, unless otherwise specified. The use of "including" and/or "comprising" in the specification means that the presence of a particular element, step, action, and/or component does not preclude the presence or addition of one or more other elements, steps, actions, and/or components.
In the following, to assist those skilled in the art in understanding the present invention, a background of the invention is first described, followed by a detailed description of the preferred embodiments of the invention.
Most cable defects occur due to electrical, mechanical, deterioration, chemical stress, of which water trees are representative of cable deterioration phenomena.
The failure of the power cable due to the deterioration of the water tree causes a power outage, which brings about a large economic cost in repair and restoration.
Therefore, there is a need to develop an effective cable diagnosis technique for detecting cable defects, such as water trees, formed in the main insulator of a power cable.
In the power cable live-line diagnosis of the prior art, a partial electricity-proof detection method is used in most cases, but there is a problem that it is difficult to provide high reliability in diagnosing defects occurring in the main insulation layer of the cable.
Further, according to the conventional technique, there has been proposed a pulse propagation characteristic analysis method in which a diagnostic pulse is applied to a cable and a reflected wave at a position of impedance discontinuity occurring due to a defect such as a water tree in the cable is analyzed in a time domain, and fig. 1 shows the principle of the pulse propagation characteristic analysis method according to 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 can roughly grasp the positional information of a defect occurring in a cable by using the pulse, but it is difficult to obtain specific progression state information of the defect such as the size and penetration depth of the defect.
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a power cable deterioration detection apparatus and a method thereof for diagnosing a cable defect by analyzing reflection characteristics by constituting a series of diagnostic pulse trains in which the size (h) and width (w) are sequentially changed at regular time intervals.
Fig. 3 and 4 show a power cable degradation detection device according to an embodiment of the present invention.
The power cable degradation detection apparatus 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 diagnostic pulse train including a plurality of short pulses different in size and width.
The processor 120 applies a diagnostic pulse train of sequentially varying size and width at preset time intervals.
The diagnostic pulse train has a form in which the size and width increase in order.
The time interval is set according to the length of the cable to be diagnosed and the pulse traveling speed.
The processor 120 analyzes the group of reflected waves detected in time series to detect defect information within the cable.
The processor 120 estimates the size of the defect of the cable by using the form of the reflected wave.
The processor 120 estimates the defect penetration depth of the cable using the size of the reflected wave.
According to an embodiment of the present invention, the effect of the size (h) and width (w) of a diagnostic pulse applied to a particular cable defect on the size of the reflected wave is quantitatively analyzed.
In order to detect the reflected wave characteristics, a signal generating unit 420 and a detecting unit 410 for generating a diagnostic pulse are provided at an input end of a cable including a specific defect, and an impedance matching unit 430 is provided between the signal generating unit 420 and an inner conductor C1 of the cable.
The cable includes an inner conductor C1, a main insulation layer C2, an outer conductor C3.
As an example, an experiment was performed by constituting 9 pulse combinations according to the Taguchi (Taguchi) experiment planning method composed of 2-factor 3 levels with the size (h) of the diagnostic pulse in the short pulse form set to 100V, 500V, and 1kV, and the width (w) of the pulse set to 10ns, 20ns, and 30 ns.
As a performance factor detected from an experimental combination of the respective diagnostic pulses, the ratio of the magnitude of the applied pulse 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 characteristic function is set.
Fig. 5 shows the signal-to-noise ratio (SN ratio) of the relative reflected wave size ratio of an embodiment of the present invention.
According to the embodiment of the present invention, the signal-to-noise ratio (SN ratio) characteristic is derived from the results of analyzing the 9 experimental combinations configured according to the tagma experimental planning method, and it is understood that the smaller the size of the diagnostic pulse, the larger the width of the diagnostic pulse, and the stronger the sensitivity for the same defect.
That is, it is known that the size and width of the diagnostic pulse applied to the same cable defect greatly affect the size of the reflected wave generated in the cable according to the defect.
According to the embodiment of the present invention, a series of diagnostic pulse trains in which the size (h) and the width (w) sequentially change are configured, and accurate positional information on a defect occurring in a cable and progression information on such a defect as the size and penetration depth of the defect are predicted.
Fig. 6 shows the structure of a diagnostic burst according to an embodiment of the present invention.
Diagnostic pulses (P) consisting of a predetermined number (i)i) In groups, pulse size (h)i) And pulse width (w)i) Gradually increasing, as in the following [ equation 1]]The interval (t) between pulses is shown to be determined by the length (l) of the cable to be diagnosed.
[ numerical formula 1]
Referring to fig. 6, the increasing trend of the pulse shown by the dotted line is a logarithmic function or a polynomial function shape.
Figure 7 shows the structure of a diagnostic pulse train applied to a cable comprising 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 the cable including two defects (defect 1, defect 2), different characteristics of the reflected wave are respectively shown by the size and width of the pulse constituting the diagnostic pulse train according to the characteristics of each defect (the size and penetration depth of the distributed defect).
According to the embodiment of the present invention, in order to efficiently analyze the reflected wave groups detected in time series, the reflected wave groups are arranged to overlap the same defect position.
Referring to fig. 7, in the case of defect 1, the pulse (P) is diagnosed1) A large reflected wave occurs, and in the case of defect 2, in the diagnostic pulse (P)i) A large reflected wave occurs.
According to the embodiment of the present invention, the distribution size of the defects is estimated as the form of the reflected wave formed for the same defect.
According to the embodiment of the present invention, the depth of penetration of the defect is estimated by using the size of the reflected wave 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: the method includes the steps of setting a diagnostic pulse including a plurality of short pulses having different sizes and widths for pulse propagation characteristic analysis, applying the diagnostic pulse (S810), and detecting deterioration of the power cable using the result of the pulse propagation characteristic analysis (S820).
(S810) in the step, diagnostic pulses whose size and width are sequentially changed with a preset time interval are set.
The diagnostic pulses have a shape in which the size and width thereof increase in order.
The time interval is set according to the length of the cable to be diagnosed and the pulse traveling speed.
(S820) estimating the size of the defect of the power cable by using the form of the reflected wave.
(S820) estimating a defect penetration depth of the power cable using the size 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 in a recording medium. The computer system includes at least one processor, memory, user input device, data communication bus, user output device and storage. Each of the above-described components performs data communication via a data communication bus.
The computer system also includes a network interface connected to a network. The processor is a Central Processing Unit (CPU) or a semiconductor device that processes command words stored in a memory and/or a storage room.
The memory and storage compartments include various forms of volatile or non-volatile storage media. The memory includes, for example, ROM and RAM.
Accordingly, the power cable degradation detection method of an embodiment of the present invention may be embodied as a computer-executable method. The power cable degradation detection method according to the embodiment of the present invention is executed by a computer device, and the power cable degradation detection method according to the present invention is executed by a command word readable by the computer device.
On the other hand, the power cable degradation detection method of the present invention described above may be embodied as computer-readable codes in a computer-readable recording medium. The computer-readable recording medium includes all kinds of recording media storing data readable by a computer system. Such as ROM (Read Only Memory), RAM (Random Access Memory), magnetic tape, magnetic disk, flash Memory, optical data storage, etc. The recording medium readable by the computer is distributed to a computer system connected via a computer communication network, and is stored and executed as a code that can be read in a distributed manner.
The embodiments of the present invention have been mainly explained above. Those skilled in the art can embody the present invention in various forms without departing from the essential characteristics thereof. Accordingly, the disclosed embodiments are not intended to limit the invention, but merely to illustrate the invention. The scope of the present invention is defined not by the above description but by the claims, and all differences within the same scope will be included in the present invention.
Claims (13)
1. A power cable degradation detection device, comprising:
a memory storing a power cable degradation detection program; and
a processor which executes the above-mentioned program,
the processor forms a diagnostic pulse train including a plurality of short pulses of different sizes and widths to perform pulse propagation characteristic analysis.
2. The power cable degradation detection device according to claim 1,
the processor applies the diagnostic pulse train in which the magnitude and width are sequentially changed at preset time intervals.
3. The power cable degradation detection device according to claim 2,
the size and width of the diagnostic pulse train increases in sequence.
4. The power cable degradation detection device according to claim 2,
the time interval is set according to the length of the cable to be diagnosed and the pulse traveling speed.
5. The power cable degradation detection device according to claim 1,
the processor analyzes the group of reflected waves detected in time series to detect defect information in the cable.
6. The power cable degradation detection device according to claim 5,
the processor estimates the size of the defect in the cable by using the form of the reflected wave.
7. The power cable degradation detection device according to claim 5,
the processor estimates the defect penetration depth of the cable by using the size of the reflected wave.
8. A power cable degradation detection method includes the following steps:
(a) setting a diagnostic pulse including a plurality of short pulses different in size and width in order to analyze pulse propagation characteristics, and applying the diagnostic pulse; and
(b) the deterioration of the power cable is detected by analyzing the result of the pulse propagation characteristics.
9. The power cable degradation detection method according to claim 8,
in the step (a), the diagnostic pulses are set such that the magnitude and the width thereof are sequentially changed at predetermined time intervals.
10. The power cable degradation detection method according to claim 9,
the magnitude and width of the diagnostic pulses increase in sequence.
11. The power cable degradation detection method according to claim 9,
the time interval is set according to the length of the cable to be diagnosed and the pulse traveling speed.
12. The power cable degradation detection method according to claim 8,
in the step (b), the defect size of the power cable is estimated using the form of the reflected wave.
13. The power cable degradation detection method according to claim 8,
in the step (b), the depth of penetration of the defect in the power cable is estimated by using the size of the reflected wave.
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| KR10-2020-0098240 | 2020-08-05 | ||
| KR1020200098240A KR102455682B1 (en) | 2020-08-05 | 2020-08-05 | Apparatus and method for detecting deterioration of a powercable |
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| CN114062855B CN114062855B (en) | 2024-04-12 |
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| JP2007309706A (en) * | 2006-05-16 | 2007-11-29 | Fujitsu Ltd | Method, device and program for evaluating electrostatic discharge damage in electronic device |
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2020
- 2020-08-05 KR KR1020200098240A patent/KR102455682B1/en active IP Right Grant
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| Publication number | Publication date |
|---|---|
| CN114062855B (en) | 2024-04-12 |
| KR20220017789A (en) | 2022-02-14 |
| KR102455682B1 (en) | 2022-10-17 |
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