CN113064024B - Cable fault distance measurement method and device - Google Patents
Cable fault distance measurement method and device Download PDFInfo
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- CN113064024B CN113064024B CN202110309860.3A CN202110309860A CN113064024B CN 113064024 B CN113064024 B CN 113064024B CN 202110309860 A CN202110309860 A CN 202110309860A CN 113064024 B CN113064024 B CN 113064024B
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- 238000000691 measurement method Methods 0.000 title claims abstract description 6
- 238000001514 detection method Methods 0.000 claims abstract description 96
- 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 20
- 238000000034 method Methods 0.000 claims description 11
- 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
- 238000010586 diagram Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000012806 monitoring device Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012360 testing method Methods 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
- G01R31/08—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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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- 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 tested has a fault or not through the online monitoring system, and if so, determining the position of a fault point of the cable to be tested, thereby obtaining a first distance h1 between the fault point and a nearest online detection device; respectively connecting a high-frequency pulse injection device, a master detection device and a slave detection device into the cable to be detected, inputting a high-frequency pulse signal into 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 master 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 of 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 quick positioning of the line fault point.
Description
Technical Field
The invention relates to the technical field of line fault location, in particular to a cable fault location method and device.
Background
At present, a relatively advanced traveling wave method is generally adopted for fault location of the cable, and two stations are generally adopted for obtaining fault traveling waves for fault location of a line with a super-long distance in traditional traveling wave location, but when an maintainer overhauls on site, the relative position of the self position and a cable fault point cannot be judged, so that the cable is still required to be identified section by adopting an acousto-magnetic synchronization method, and a great amount of time is consumed in searching.
Disclosure of Invention
The invention aims to provide a cable fault location method for solving the problems in the background technology.
The invention is realized by the following technical scheme: the invention discloses a cable fault location method, which comprises the following steps:
Judging whether the cable to be tested has a fault or not through the online monitoring system, and if so, determining the position of a fault point of the cable to be tested, thereby obtaining a first distance h1 between the fault point and a nearest online detection device;
Respectively connecting a high-frequency pulse injection device, a master detection device and a slave detection device into the cable to be detected, inputting a high-frequency pulse signal into 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 master 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 of 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 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 tested from the on-line detection device, and the connection positions of the high-frequency pulse injection device and the main detection device are taken as starting points.
Preferably, the secondary 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 distances h2 and the first distances h1 is minimum, the position of the secondary detection device is the position of the fault point on the line.
Preferably, the second distance h2 is calculated by: h2 = (t 2-t 1) v, where v is the wave velocity of the traveling wave in the line.
The invention discloses a cable fault distance measuring device, which comprises a high-frequency pulse injection device, a master detection device and a slave detection device, wherein the slave detection device is in communication interconnection with the master detection device, and the high-frequency pulse injection device and the master detection device are connected with a cable to be measured from the same position.
Preferably, the master detection device and the slave detection device comprise a signal acquisition board, a main control board, a GPS module, a wireless communication module and a detection magnetic ring, wherein the detection magnetic ring is connected with the signal acquisition board through signals, the GPS module, the signal acquisition board and the wireless communication module are connected with the main control board through signals, and the signal acquisition board, the main control board, the GPS module and the wireless communication module are 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 connected with the main control board through signals.
Compared with the prior art, the invention has the following beneficial effects:
According to the cable fault distance measurement method and device, the high-frequency pulse injection device is used for injecting the high-frequency pulse signal into the overhaul cable, the main detection device and the auxiliary detection device synchronously acquire the pulse signal, the traveling wave double-end distance measurement 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 position of the fault point is approximated, and the real position of the fault is found.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only preferred embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a cable fault location method provided by the invention;
FIG. 2 is a block diagram of a cable fault distance measuring device according to the present invention
FIG. 3 is a schematic diagram of the connection of components of the signal acquisition board according to the present invention;
FIG. 4 is a schematic diagram of connection of 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 1b, a filter circuit 2, a main control board 2, aARM chips, a 2b data memory 3, a wireless communication module 4, a GPS module 5, a power supply, a 6 detection magnetic ring, an 8 high-frequency pulse injection device, an 8a direct-current power supply, an 8b pulse capacitor, a 9 main detection device, a 10 slave detection device and an 11 display screen are arranged.
Detailed Description
For a better understanding of the technical content of the present invention, specific examples are provided below and the present invention is further described with reference to the accompanying drawings.
Referring to fig. 1, the first aspect of the present invention discloses a cable fault location method, which comprises the following steps:
Step 101: the method comprises the steps of collecting operation data of a cable to be tested through an online monitoring system, and judging whether the cable to be tested has faults or not through the operation data, wherein the cable to be tested can be a cable of a power transmission line or a power distribution line, and the cable to be tested can be understood to also comprise other cables for current transmission;
in addition, it should be noted that, the distance between the line monitoring device and the fault point is generally used to represent the position of the fault point, for example, the position of the fault point is 8km away from the kth line monitoring device, if a fault occurs, the position of the fault point of the cable to be tested is rapidly determined through the online monitoring system, so as to obtain the first distance h1 between the fault point and the closest line monitoring device;
Step 102: the high-frequency pulse injection device 8, the main detection device 9 and the auxiliary detection device 10 are respectively connected with the cable to be detected, the high-frequency pulse injection device 8 and the main detection device 9 are connected with the cable to be detected at the same position, and the connection position of the main detection device 9 is taken as a starting point, wherein the position can be the position of the online detection device, and the auxiliary detection device 10 is taken as the 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 propagates 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 tested, the high-frequency pulse signal can be detected at the secondary detection device 10 for the second time, and at the moment, a second sampling time t2 of the high-frequency pulse signal is recorded, and the secondary detection device 10 sends the second sampling time t2 to the primary detection device 9;
Step 103: the second distance h2 between the master detection device 9 and the slave detection device 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 detection device 9 and the slave detection device 10 is calculated by the following calculation formula: h2 = (t 2-t 1) ×v, where v is the wave velocity of the traveling wave in the line, and the value range of the wave velocity is 168-172m/μs, and in this embodiment, the wave velocity is set to 170m/μs.
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 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 10 is closest to the position of the fault point on the line.
Referring to fig. 2 to 5, a second aspect of the present invention discloses a cable fault distance measuring device, which comprises a high-frequency pulse injection device 8, a master detection device 9 and a slave detection device 10, wherein the slave detection device 10 is in communication interconnection with the master detection device 9, the high-frequency pulse injection device 8 and the master detection device 9 are both connected with a cable to be measured from the same position, the connection position of the master detection device 9 is regarded as a starting point, and the slave detection device 10 is regarded as a distance measuring end point
Optionally, the master detection device 10 and the slave detection device 10 all include a signal acquisition board 1, a main control board 2, a GPS module 4, a wireless communication module 3, and a detection magnetic ring 6, the detection magnetic ring 6 is connected with the signal acquisition board 1 through signals, the GPS module 4, the signal acquisition board 1, and the wireless communication module 3 are connected with the main control board 2 through signals, and the signal acquisition board 1, the main control board 2, the GPS module 4, and the wireless communication module 3 are connected with the power supply 5.
The method comprises the steps that a signal acquisition board 1 in a main detection device 9 acquires a high-frequency pulse signal at a starting end, the main control board 2 in the main detection device 9 carries out time service on the acquisition time of the signal acquisition board 1 in the main detection device 9 through a GPS module 4, the main control board 2 in a slave detection device 10 acquires a high-frequency pulse signal at an end point, the main control board 2 in the slave detection device 10 carries out time service on the acquisition time of the signal acquisition board 1 in 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 in 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 signals and a preset traveling wave velocity, compares the calculated distance with the position of a fault point, judges the distance between the slave detection device 10 and the fault point, and if the position of the slave detection device 10 is inconsistent with the position of the fault point, the slave detection device 10 moves the slave detection device 10, the end point is reset, the distance h2 is reset, and the second distance h2 is calculated again, so that the slave detection device 10 is consistent with the position of the fault point.
Optionally, the GPS module 4 includes a GPS/beidou module, and the wireless communication module 3 includes a Lora wireless module.
Optionally, the signal acquisition board 1, the main control board 2, the GPS module 4, the wireless communication module 3 and the power supply 5 are all installed in the box, the display screen 11 is further arranged in the box, the display screen 11 is in signal connection with the main control board 2, and the second distance h2 can be displayed through the display screen 11.
Referring to fig. 3, preferably, the signal acquisition board 1 is provided with a signal amplifying circuit 1a and a filtering circuit 1b, an output end of the detecting magnetic ring 6 is connected with the signal amplifying circuit 1a, an output end of the signal amplifying circuit 1a is connected with the filtering circuit 1b in a signal manner, and an output end of the filtering circuit 1b is connected with the main control board 2 in a signal manner. When the device is used, signals acquired by the detection magnetic ring 6 are amplified by the signal amplifying circuit 1a, filtered by the filtering circuit 1b, and then the wave head of the signals is extracted and time-service carried out by 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, the output end of the AD converter is connected to the ARM chip 2a, the ARM chip 2a is signal-connected to the data memory 2b, signal processing software is disposed in the ARM chip 2a, and the signal processing software can be used to extract a wave head, and the data memory 2b is used to store wave head time data when the extracted wave head is given according to the GPS module 4.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (6)
1. The cable fault distance measurement method is characterized by comprising the following steps of:
Judging whether the cable to be tested has a fault or not through the online monitoring system, and if so, determining the position of a fault point of the cable to be tested, thereby obtaining a first distance h1 between the fault point and a nearest online detection device;
respectively connecting a high-frequency pulse injection device, a master detection device and a slave detection device into the cable to be detected, inputting a high-frequency pulse signal into the cable to be detected through the high-frequency pulse injection device, determining a first sampling time t1 of the high-frequency pulse signal through the master detection device, and determining a second sampling time t2 of the high-frequency pulse signal through the slave detection device;
Determining a second distance h2 of 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 quick positioning of a line fault point;
The high-frequency pulse injection device and the main detection device are connected with the cable to be detected from the nearest online detection device, and the connection positions of the high-frequency pulse injection device and the main detection device are taken as starting points;
And continuously moving the secondary detection device along the cable to be detected to obtain second distances h2 with different lengths, wherein when the distance difference between the second distances h2 and the first distances h1 is minimum, the position of the secondary detection device is the position of the fault point on the line.
2. The cable fault location method of claim 1, wherein the second distance h2 is calculated by: h2 = (t 2-t 1) v, where v is the wave velocity of the traveling wave in the line.
3. A cable fault distance measuring device, comprising a high-frequency pulse injection device, wherein the distance measuring device is used for realizing the distance measuring method according to any one of claims 1-2, the distance measuring device further comprises a master detection device and a slave detection device, the slave detection device is in communication interconnection with the master detection device, and the high-frequency pulse injection device and the master detection device are both connected into a cable to be measured from the same position.
4. The cable fault distance measuring device according to claim 3, wherein the master and slave detection devices comprise a signal acquisition board, a main 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 main control board, and the signal acquisition board, the main control board, the GPS module and the wireless communication module are all connected with a power supply.
5. The cable fault location device of claim 4, wherein the GPS module comprises a GPS/beidou module and the wireless communication module comprises a Lora wireless module.
6. The cable fault distance measuring device according to claim 5, wherein 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.
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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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| CN113064024B true CN113064024B (en) | 2024-04-26 |
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Families Citing this family (3)
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| CN113884808B (en) * | 2021-09-28 | 2023-11-10 | 华北电力大学（保定） | Cable fault detection system and fault positioning method thereof |
| 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 |
| 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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