CN113064024A - Cable fault distance measuring method and device - Google Patents
Cable fault distance measuring method and device Download PDFInfo
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- CN113064024A CN113064024A CN202110309860.3A CN202110309860A CN113064024A CN 113064024 A CN113064024 A CN 113064024A CN 202110309860 A CN202110309860 A CN 202110309860A CN 113064024 A CN113064024 A CN 113064024A
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- 238000000034 method Methods 0.000 title claims description 15
- 238000001514 detection method Methods 0.000 claims abstract description 91
- 238000002347 injection Methods 0.000 claims abstract description 21
- 239000007924 injection Substances 0.000 claims abstract description 21
- 238000005070 sampling Methods 0.000 claims abstract description 17
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims description 17
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 abstract description 3
- 230000003321 amplification Effects 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012806 monitoring device Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
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- 238000000605 extraction Methods 0.000 description 1
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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
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
- G01S19/10—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing dedicated supplementary positioning signals
- G01S19/12—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing dedicated supplementary positioning signals wherein the cooperating elements are telecommunication base stations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
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- Radar, Positioning & Navigation (AREA)
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- General Physics & Mathematics (AREA)
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- Locating Faults (AREA)
Abstract
The invention provides a cable fault distance measurement method and a device, wherein the distance measurement method comprises the following steps: judging whether the cable to be detected fails or not through the online monitoring system, and if so, determining the position of a fault point of the cable to be detected so as to obtain a first distance h1 between the fault point and a closest online detection device; respectively connecting a high-frequency pulse injection device, a main detection device and a slave detection device to the cable to be detected, inputting a high-frequency pulse signal to a circuit to be detected through the high-frequency pulse injection device, determining a first sampling time t1 of the high-frequency pulse signal through the main detection device, and determining a second sampling time t2 of the high-frequency pulse signal through the slave detection device; and determining a second distance h2 between the master detection device and the slave detection device through the time difference between the first sampling time t1 and the second sampling time t2, and comparing the distance difference between the first distance h1 and the second distance h2 to realize the quick positioning of the line fault point.
Description
Technical Field
The invention relates to the technical field of line fault distance measurement, in particular to a cable fault distance measurement method and device.
Background
At present, the fault location of a cable generally adopts a relatively advanced traveling wave method, the fault location of a super-long-distance line is generally realized by acquiring fault traveling waves through two stations in the traditional traveling wave location, but when a maintainer carries out field maintenance, the relative position of the maintainer and a fault point of the cable cannot be judged, so that the cable still needs to be identified section by adopting an acousto-magnetic synchronization method, and a large amount of time is consumed in searching.
Disclosure of Invention
The present invention is directed to a cable fault location method to solve the above problems in the background art.
The invention is realized by the following technical scheme: the invention discloses a cable fault location method in a first aspect, which comprises the following steps:
judging whether the cable to be detected fails or not through the online monitoring system, and if so, determining the position of a fault point of the cable to be detected so as to obtain a first distance h1 between the fault point and a closest online detection device;
respectively connecting a high-frequency pulse injection device, a main detection device and a slave detection device to the cable to be detected, inputting a high-frequency pulse signal to a circuit to be detected through the high-frequency pulse injection device, determining a first sampling time t1 of the high-frequency pulse signal through the main detection device, and determining a second sampling time t2 of the high-frequency pulse signal through the slave detection device;
and determining a second distance h2 between the master detection device and the slave detection device through the time difference between the first sampling time t1 and the second sampling time t2, and comparing the distance difference between the first distance h1 and the second distance h2 to realize the quick positioning of the line fault point.
Preferably, the high-frequency pulse injection device and the main detection device are connected to the cable to be detected from the online detection device, and the connection positions of the high-frequency pulse injection device and the main detection device are regarded as starting points.
Preferably, the slave detection device is continuously moved along the cable to be detected to obtain second distances h2 with different lengths, and when the distance difference between the second distance h2 and the first distance h1 is minimum, the position of the slave detection device is the position of a fault point on the line.
Preferably, the second distance h2 is calculated by: h2 ═ v (t2-t1), where v is the wave speed of the traveling wave in the line.
The invention discloses a cable fault distance measuring device in a second aspect, which comprises a high-frequency pulse injection device, a main detection device and a slave detection device, wherein the slave detection device and the main detection device are communicated and interconnected, and the high-frequency pulse injection device and the main detection device are both connected into a cable to be measured from the same position.
Preferably, the master and slave detection devices respectively comprise a signal acquisition board, a master control board, a GPS module, a wireless communication module and a detection magnetic ring, the detection magnetic ring is in signal connection with the signal acquisition board, the GPS module, the signal acquisition board and the wireless communication module are in signal connection with the master control board, and the signal acquisition board, the master control board, the GPS module and the wireless communication module are all connected with a power supply.
Preferably, the GPS module comprises a GPS/Beidou module, and the wireless communication module comprises a Lora wireless module.
Preferably, the signal acquisition board, the main control board, the GPS module, the wireless communication module and the power supply are all installed in the box body, a display screen is further arranged in the box body, and the display screen is in signal connection with the main control board.
Compared with the prior art, the invention has the following beneficial effects:
according to the cable fault location method and device provided by the invention, a high-frequency pulse signal is injected into an overhaul cable through a high-frequency pulse injection device, a main detection device and a slave detection device synchronously acquire the pulse signal, the traveling wave double-end location technology is adopted, the wave speed is calculated on the basis of the known cable length, the cable length is measured for multiple times, the cable length approaches the position of a fault point, and the real position of the fault is found.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only preferred embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart of a cable fault location method according to the present invention;
FIG. 2 is a structural diagram of a cable fault location device according to the present invention
FIG. 3 is a schematic diagram of the connection of the components of the signal acquisition board provided by the present invention;
FIG. 4 is a schematic view of the connection of the main control board elements provided by the present invention;
FIG. 5 is a schematic diagram of a detection connection provided by the present invention.
In the figure, a signal acquisition board 1, a signal amplification circuit 1a, a filter circuit 1b, a main control board 2, an ARM chip 2b, a data memory 2b, a wireless communication module 3, a GPS module 4, a power supply 5, a detection magnetic ring 6, a high-frequency pulse injection device 8, a direct-current power supply 8a, a pulse capacitor 8b, a main detection device 9, a slave detection device 10 and a display screen 11.
Detailed Description
In order to better understand the technical content of the invention, specific embodiments are provided below, and the invention is further described with reference to the accompanying drawings.
Referring to fig. 1, a first aspect of the present invention discloses a cable fault location method, including the following steps:
step 101: the method comprises the steps that operation data of a cable to be detected are collected through an online monitoring system, and whether the cable to be detected breaks down or not is judged through the operation data, wherein the cable to be detected can be a cable of a power transmission line or a power distribution line, and the method can be understood to further comprise other cables for current transmission;
it should be noted that, the distance between the line monitoring device and the fault point is usually used to represent the position of the fault point, for example, the position of the fault point is 8km from the kth line monitoring device, if a fault occurs, the position of the fault point of the cable to be tested is quickly determined by the online monitoring system, so as to obtain a first distance h1 between the fault point and a nearest line monitoring device;
step 102: the high-frequency pulse injection device 8, the main detection device 9 and the slave detection device 10 are respectively connected to the cable to be measured, the high-frequency pulse injection device 8 and the main detection device 9 are connected to the cable to be measured at the same position, the connection position of the main detection device 9 is regarded as a starting point, the position can be the position of the on-line detection device, and the slave detection device 10 is regarded as an end point of distance measurement.
During testing, a high-frequency pulse signal is input to the cable to be tested through the high-frequency pulse injection device 8, the high-frequency pulse signal is transmitted along the cable to be tested, the high-frequency pulse signal can be detected for the first time at the main detection device 9, and the first sampling time t1 of the high-frequency pulse signal is recorded;
when the high-frequency pulse signal continues to propagate along the cable to be detected, the high-frequency pulse signal can be detected for the second time at the position of the slave detection device 10, at the moment, the second sampling time t2 of the high-frequency pulse signal is recorded, and the slave detection device 10 sends the second sampling time t2 to the position of the master detection device 9;
step 103: the second distance h2 between the master and slave inspection devices 9 and 10 is determined by the time difference between the first sampling time t1 and the second sampling time t2, and the second distance h2 between the master and slave inspection devices 9 and 10 is calculated by the following calculation formula: h2 is (t2-t1) v, where v is the wave speed of the traveling wave in the line, and the range of the wave speed is 168 and 172m/μ s, and in the present embodiment, the wave speed is set to 170m/μ s.
When the second distance h2 is far smaller or far larger than the first distance h1, the operator continuously moves the slave detection device 10 along the cable to be detected to obtain a second distance h2 with different lengths, and when the distance difference between the second distance h2 and the first distance h1 is minimum, the position of the slave detection device 10 is closest to the position of a fault point on the line.
Referring to fig. 2 to 5, in a second aspect of the present invention, a cable fault distance measuring device is disclosed, which includes a high-frequency pulse injection device 8, and further includes a master detection device 9 and a slave detection device 10, where the slave detection device 10 and the master detection device 9 are communicatively interconnected, the high-frequency pulse injection device 8 and the master detection device 9 both access a cable to be measured from the same position, the access position of the master detection device 9 is regarded as a starting point, and the slave detection device 10 is regarded as an end point of distance measurement
Optionally, the master and slave detection devices 10 each include a signal acquisition board 1, a master control board 2, a GPS module 4, a wireless communication module 3, and a detection magnetic ring 6, the detection magnetic ring 6 is in signal connection with the signal acquisition board 1, the GPS module 4, the signal acquisition board 1, and the wireless communication module 3 are in signal connection with the master control board 2, and the signal acquisition board 1, the master control board 2, the GPS module 4, and the wireless communication module 3 are all connected with the power supply 5.
A signal acquisition board 1 in a main detection device 9 acquires a high-frequency pulse signal of a starting end, a main control board 2 in the main detection device 9 gives time to the acquisition time of the signal acquisition board 1 of the main detection device 9 through a GPS module 4, similarly, the signal acquisition board 1 in the detection device 10 acquires a high-frequency pulse signal of an end point, the main control board 2 in the detection device 10 gives time to the acquisition time of the signal acquisition board 1 of the slave detection device 10 through the GPS module 4, the slave detection device 10 transmits the acquired acquisition time to the main detection device 9 through a wireless communication module 3, the main control board 2 of the main detection device 9 calculates a second distance h2 between the starting end and the end point according to the time difference between the two and a preset traveling wave velocity, compares the calculated distance with the position of a fault point, and judges the distance between the slave detection device 10 and the fault point, if the position of the slave detection device 10 does not coincide with the position of the failure point, the slave detection device 10 is moved, the distance measurement end point is reset, and the second distance h2 is recalculated so that the position of the slave detection device 10 coincides with the position of the failure point.
Optionally, the GPS module 4 includes a GPS/beidou module, and the wireless communication module 3 includes a Lora wireless module.
Optionally, signal acquisition board 1, main control board 2, GPS module 4, wireless communication module 3, power supply 5 all install in the box, still be equipped with display screen 11 in the box, display screen 11 with main control board 2 signal links to each other, can show second distance h2 through display screen 11.
Referring to fig. 3, preferably, the signal acquisition board 1 is provided with a signal amplification circuit 1a and a filter circuit 1b, an output end of the detection magnetic ring 6 is connected to the signal amplification circuit 1a, an output end of the signal amplification circuit 1a is in signal connection with the filter circuit 1b, and an output end of the filter circuit 1b is in signal connection with the main control board 2. When the magnetic detection device is used, signals collected by the detection magnetic ring 6 are amplified through the signal amplification circuit 1a, filtered through the filter circuit 1b, and then subjected to wave head extraction of the signals and time service through the main control board 2.
Referring to fig. 4, preferably, the main control board 2 includes an ARM chip 2a and a data memory 2b, an output end of the AD converter is connected to the ARM chip 2a, the ARM chip 2a is connected to the data memory 2b by signals, the ARM chip 2a is provided with signal processing software for extracting a wave head, and the data memory 2b is used for storing wave head time data according to the time service of the extracted wave head by the GPS module 4.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A cable fault location method is characterized by comprising the following steps:
judging whether the cable to be detected fails or not through the online monitoring system, and if so, determining the position of a fault point of the cable to be detected so as to obtain a first distance h1 between the fault point and a closest online detection device;
respectively connecting a high-frequency pulse injection device, a main detection device and a slave detection device to the cable to be detected, inputting a high-frequency pulse signal to a circuit to be detected through the high-frequency pulse injection device, determining a first sampling time t1 of the high-frequency pulse signal through the main detection device, and determining a second sampling time t2 of the high-frequency pulse signal through the slave detection device;
and determining a second distance h2 between the master detection device and the slave detection device through the time difference between the first sampling time t1 and the second sampling time t2, and comparing the distance difference between the first distance h1 and the second distance h2 to realize the quick positioning of the line fault point.
2. The method for measuring the distance between the cable faults as claimed in claim 1, wherein the high frequency pulse injection device and the main detection device are connected to the cable to be measured from the on-line detection device, and the connection positions of the high frequency pulse injection device and the main detection device are regarded as starting points.
3. The method as claimed in claim 2, wherein the slave detection device is moved continuously along the cable to be tested to obtain the second distances h2 with different lengths, and when the distance difference between the second distance h2 and the first distance h1 is the smallest, the position of the slave detection device is the position of the fault point on the line.
4. A cable fault location method according to claim 3, wherein the second distance h2 is calculated by: h2 ═ v (t2-t1), where v is the wave speed of the traveling wave in the line.
5. The cable fault distance measuring device comprises a high-frequency pulse injection device and is characterized by further comprising a main detection device and a slave detection device, wherein the slave detection device and the main detection device are communicated and interconnected, and the high-frequency pulse injection device and the main detection device are connected into a cable to be measured from the same position.
6. The cable fault location device of claim 5, wherein the master and slave detection devices each comprise a signal acquisition board, a master control board, a GPS module, a wireless communication module, and a detection magnetic ring, the detection magnetic ring is in signal connection with the signal acquisition board, the GPS module, the signal acquisition board, and the wireless communication module are in signal connection with the master control board, and the signal acquisition board, the master control board, the GPS module, and the wireless communication module are in signal connection with a power supply.
7. The cable fault location device of claim 6, wherein the GPS module comprises a GPS/Beidou module, and the wireless communication module comprises a Lora wireless module.
8. The cable fault location device of claim 6, wherein the signal acquisition board, the main control board, the GPS module, the wireless communication module and the power supply are all installed in a box, a display screen is further arranged in the box, and the display screen is in signal connection with the main control board.
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| CN202110309860.3A CN113064024B (en) | 2021-03-23 | 2021-03-23 | Cable fault distance measurement method and device |
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| CN202110309860.3A CN113064024B (en) | 2021-03-23 | 2021-03-23 | Cable fault distance measurement method and device |
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Cited By (3)
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| CN113759204A (en) * | 2021-11-10 | 2021-12-07 | 成都高斯电子技术有限公司 | Power line loss testing device and method |
| CN113884808A (en) * | 2021-09-28 | 2022-01-04 | 华北电力大学（保定） | Cable fault detection system and fault positioning method thereof |
| CN114167212A (en) * | 2021-11-29 | 2022-03-11 | 海南电网有限责任公司电力科学研究院 | Cable ranging method, device and system |
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