CN110007196A - A method of on-line monitoring cable fault position - Google Patents
A method of on-line monitoring cable fault position Download PDFInfo
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- CN110007196A CN110007196A CN201910367706.4A CN201910367706A CN110007196A CN 110007196 A CN110007196 A CN 110007196A CN 201910367706 A CN201910367706 A CN 201910367706A CN 110007196 A CN110007196 A CN 110007196A
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- cable
- under test
- cable core
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- frequency signal
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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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- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
The invention discloses a kind of methods for monitoring cable fault position on-line, belong to cable fault monitoring technical field.The following steps are included: a. detects cable under test electromagnetic transmission time T1；B. cable fault temporal information T2 is monitored on-line；C. cable under test position of failure point G is calculated away from the end A or away from the distance H1 at the end B.It has the characteristics that operation is convenient, monitoring cost is low.
Description
Technical field
The present invention relates to cable fault monitoring technical fields.
Background technique
The accurate positioning of cable fault needs time synchronization.If detection device is mounted on cable ends, both-end is synchronous
It is the premise for realizing positioning.Current simultaneous techniques is based on GPS satellite signal and Network Synchronization.GPS satellite signal is in underground
It is easy to be shielded in environment, and cable is all layed in underground, therefore this kind of simultaneous techniques and is not suitable for.The network-based side of synchronization
Formula needs to be laid with optical fiber or cable and builds the network equipment, and investment is big, and the construction period is long.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of methods for monitoring cable fault position on-line, it has operation
Convenient, the features such as monitoring cost is low.
In order to solve the above technical problems, the technical solution used in the present invention is:
A method of on-line monitoring cable fault position, comprising the following steps:
A. cable under test electromagnetic transmission time T1 is detected, by the first HF signal generator connecing at the end cable under test A
Ground wire injects a high-frequency signal F1, while when passing through timer, thus make high-frequency signal F1 in a manner of electromagnetic coupling by
The end cable core A of cable under test is injected, and propagates the end cable core B to cable under test along the cable core of cable under test；When electricity to be measured
When the end cable core B of cable detects high-frequency signal F1 by the second HF current transformer, the second HF signal generator is controlled
The end cable under test B ground line inject a high-frequency signal F2, thus make high-frequency signal F2 in a manner of electromagnetic coupling by
The end the cable core B injection for surveying cable, propagates the end cable core A to cable under test along the cable core of cable under test；Work as cable under test
The end cable core A when detecting high-frequency signal F2 by the first HF current transformer, control timer stops timing, and records
Timer institute timing time T0, then, and T1=T0/2；
B. cable fault temporal information T2 is monitored on-line, when the first HF current transformer detects the cable of cable under test
When the high-frequency pulse signal F3 that the end core A is issued by cable core fault, control timer starts timing, when the second high-frequency electrical
When current transformer detects the high-frequency pulse signal F3 that the end cable core B of cable under test is issued by cable core fault, control
It makes ground line of second HF signal generator at the end cable under test B and injects a high-frequency signal F4, to make the high-frequency signal
F4 is injected in a manner of electromagnetic coupling by the end cable core B of cable under test, is propagated along the cable core of cable under test to cable under test
The end cable core A；When the end cable core A of cable under test detects high-frequency signal F4 by the first HF current transformer, control
Timer stops timing, and records timer timing time T3, then, T2=T3-T1；
C. cable under test position of failure point G is calculated away from the end A or away from the distance H1 at the end B, and enabling cable physical length is H, then, H1
=| T1-T2 |/2 × H；Then H1 numerical value is distance of the cable under test position of failure point G away from the end A.
The beneficial effects of adopting the technical scheme are that
The present invention passes through the first HF signal generator, the first HF current transformer, the second HF signal generator, the
Two HF current transformers are synchronous with the use of the clock at power cable both ends is completed with timer, used at present to replace
GPS satellite signal or the clock completed of network it is synchronous, avoid clock caused by due to GPS signal is in the shielded situation in underground
It is unable to stationary problem；Due to not needing that cable is followed completely to build network, save the cost reduces construction period.It has operation
Convenient, the features such as monitoring cost is low.
Detailed description of the invention
Fig. 1 is testing principle structural schematic diagram of the present invention.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be described in further detail.
To cable monitoring theory structure to be measured referring to Fig. 1, a method of on-line monitoring cable fault position, including it is following
Step:
A. cable under test electromagnetic transmission time T1 is detected, by the first HF signal generator connecing at the end cable under test A
Ground wire injects a high-frequency signal F1, while when passing through timer, thus make high-frequency signal F1 in a manner of electromagnetic coupling by
The end cable core A of cable under test is injected, and propagates the end cable core B to cable under test along the cable core of cable under test；When electricity to be measured
When the end cable core B of cable detects high-frequency signal F1 by the second HF current transformer, the second HF signal generator is controlled
The end cable under test B ground line inject a high-frequency signal F2, thus make high-frequency signal F2 in a manner of electromagnetic coupling by
The end the cable core B injection for surveying cable, propagates the end cable core A to cable under test along the cable core of cable under test；Work as cable under test
The end cable core A when detecting high-frequency signal F2 by the first HF current transformer, control timer stops timing, and records
Timer institute timing time T0, then, and T1=T0/2；
B. cable fault temporal information T2 is monitored on-line, when the first HF current transformer detects the cable of cable under test
When the high-frequency pulse signal F3 that the end core A is issued by cable core fault, control timer starts timing, when the second high-frequency electrical
When current transformer detects the high-frequency pulse signal F3 that the end cable core B of cable under test is issued by cable core fault, control
It makes ground line of second HF signal generator at the end cable under test B and injects a high-frequency signal F4, to make the high-frequency signal
F4 is injected in a manner of electromagnetic coupling by the end cable core B of cable under test, is propagated along the cable core of cable under test to cable under test
The end cable core A；When the end cable core A of cable under test detects high-frequency signal F4 by the first HF current transformer, control
Timer stops timing, and records timer timing time T3, then, T2=T3-T1；
C. cable under test position of failure point G is calculated away from the end A or away from the distance H1 at the end B, and enabling cable physical length is H, then, H1
=| T1-T2 |/2 × H；Then H1 numerical value is distance of the cable under test position of failure point G away from the end A.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other technology necks
Domain is included within the scope of the present invention.
Claims (1)
1. a kind of method for monitoring cable fault position on-line, it is characterised in that: the described method comprises the following steps:
A. cable under test electromagnetic transmission time T1, the ground line by the first HF signal generator at the end cable under test A are detected
When injecting a high-frequency signal F1, while passing through timer, to make high-frequency signal F1 in a manner of electromagnetic coupling by be measured
The end cable core A of cable is injected, and propagates the end cable core B to the cable under test along the cable core of the cable under test；Work as institute
When stating the end cable core B of cable under test and detecting the high-frequency signal F1 by the second HF current transformer, control second is high
Ground line of the frequency signal generator at the end cable under test B injects a high-frequency signal F2, to make high-frequency signal F2 with electromagnetism
Coupled modes are injected by the end cable core B of cable under test, are propagated along the cable core of the cable under test to the cable under test
The end cable core A；When the end cable core A of the cable under test detects the high-frequency signal F2 by the first HF current transformer
When, control timer stops timing, and records timer institute timing time T0, then, T1=T0/2；
B. cable fault temporal information T2 is monitored on-line, when the first HF current transformer detects the cable core A of cable under test
When holding the high-frequency pulse signal F3 issued by cable core fault, control timer starts timing, when the second high-frequency current
When mutual inductor detects the high-frequency pulse signal F3 that the end cable core B of cable under test is issued by cable core fault, control
Ground line of second HF signal generator at the end cable under test B injects a high-frequency signal F4, to make high-frequency signal F4
It is injected in a manner of electromagnetic coupling by the end cable core B of cable under test, is propagated along the cable core of the cable under test to described to be measured
The end cable core A of cable；When the end cable core A of the cable under test detects the high frequency by the first HF current transformer
When signal F4, control timer stops timing, and records timer timing time T3, then, T2=T3-T1；
C. cable under test position of failure point G is calculated away from the end A or away from the distance H1 at the end B, and enabling cable physical length is H, then, H1=|
T1-T2|/2×H；Then H1 numerical value is distance of the cable under test position of failure point G away from the end A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910367706.4A CN110007196A (en) | 2019-05-05 | 2019-05-05 | A method of on-line monitoring cable fault position |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910367706.4A CN110007196A (en) | 2019-05-05 | 2019-05-05 | A method of on-line monitoring cable fault position |
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| CN110007196A true CN110007196A (en) | 2019-07-12 |
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| CN201910367706.4A Pending CN110007196A (en) | 2019-05-05 | 2019-05-05 | A method of on-line monitoring cable fault position |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820623A (en) * | 2021-09-29 | 2021-12-21 | 苏州热工研究院有限公司 | Cable shielding layer ground fault judgment 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113820623A (en) * | 2021-09-29 | 2021-12-21 | 苏州热工研究院有限公司 | Cable shielding layer ground fault judgment 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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Application publication date: 20190712 |