CN109557424A - A kind of buried cable partial fault detection method - Google Patents
A kind of buried cable partial fault detection method Download PDFInfo
- Publication number
- CN109557424A CN109557424A CN201811495010.1A CN201811495010A CN109557424A CN 109557424 A CN109557424 A CN 109557424A CN 201811495010 A CN201811495010 A CN 201811495010A CN 109557424 A CN109557424 A CN 109557424A
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- signal
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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
- G01R31/11—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
- G01R31/1218—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 optical methods; using charged particle, e.g. electron, beams or X-rays
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention discloses a kind of buried cable partial fault detection methods.Cable artificial detection, low efficiency, poor accuracy.The present invention fills a detection mould group at interval of L meter ampere on cable；Detecting mould group includes temperature detecting unit, gas detection cell, arc detection unit, wireless module and failure location unit；Failure location unit includes action of low-voltage pulse transmitter and pulse receiver.The present invention passes through the big actual use situation because of usually precise cable of detection temperature, gas density, electric arc three, and operator's remote control, real time on-line monitoring and early warning are realized, save a large amount of manpower and material resources, testing result is more accurate, and fault location is also more accurate.
Description
Technical field
The invention belongs to cable detection technical fields, and in particular to a kind of buried cable partial fault detection method.
Background technique
Cable is the essential delivery means of transporting power in city, and application in real life is very wide
It is general, but many defects can be generated during the manufacturing of cable itself, such as: the insulation of cable skin stomata, cable
Layer is uneven etc., also will appear abrasion, surface breakdown etc. in transport and process of deployment.Meanwhile buried cable environment compares evil
It is bad, it is chronically at a kind of state of humidity, is more likely to there can be some insect pests, causes cable aging damaged, eventually leads to part
Position failure electric discharge, so that the electric discharge of cable be caused to burn, occurs accident.
In traditional life, cable uses always artificial detection, and detection efficiency is low, and due to buried cable topology layout ratio
More complex, line direction is hidden, it is understood that there may be other X factors.During detection, since accuracy of detection is too poor, no
The use situation of cable and its damage situations on surface can be found in time.
Summary of the invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of buried cable partial fault detection methods, lead to
The collection and processing that temperature, gas density, electric arc blinker are carried out to buried cable are crossed, and by processing result by wirelessly passing
The form of broadcasting is transferred on remote computer, and remote computer carries out early warning to local abort situation, then anti-using action of low-voltage pulse
Penetrate method fault point.
The present invention is specific as follows:
Step 1: filling a detection mould group, L >=100 meter at interval of L meter ampere on cable；The detection mould group includes
Temperature detecting unit, gas detection cell, arc detection unit, wireless module and failure location unit；The fault location
Unit includes action of low-voltage pulse transmitter and pulse receiver；Temperature detecting unit acquires the temperature signal of cable, and temperature is believed
Number output to signal acquisition unit；Gas detection cell detects HS and SF6 gas, and will test result and be transmitted to signal acquisition list
Member；The arc signal for the cable discharge moment that arc detection unit will test is transmitted to signal acquisition unit.
Step 2: each detection mould group is successively numbered in remote computer, the signal acquisition list of each detection mould group
Member is by collected all signals by radioing to remote computer；Remote computer is successively to the letter of each detection mould group
Number judged；The signal deterministic process of each detection mould group is as follows: first determine whether temperature signal, if temperature is higher than 90 DEG C,
Judge whether there is HS and SF6 gas and arc signal；HS and SF6 gas and arc signal if it does not exist, then it is long-range to count
Calculation machine starts three-level early warning；HS or SF6 gas if it exists, but arc signal is not present, then remote computer starts second level early warning；
If there are HS or SF6 gases for judgement, and there are arc signals, then remote computer starts level-one early warning.
Step 3: starting level-one or when second level early warning, remote computer passes through wireless transmission control signal to opening simultaneously
Wireless module in the detection mould group of dynamic early warning；In the detection mould group for starting early warning, action of low-voltage pulse transmitter receives wireless module
Emit a pulse after the control signal transmitted, while launch time will be transmitted to remote computer through wireless module；Pulse is in event
It propagates in barrier cable, is reflected back when pulse encounters fault point in the cable, corresponding pulse receiver receives reflection letter
Number, while reflection interval remote computer will be transmitted to through wireless module；Remote computer records the transmitting of action of low-voltage pulse transmitter
Pulse and pulse receiver receive the time difference Δ t of reflection signal, and calculate action of low-voltage pulse transmitter between fault point away from
From v Δ t/2, so that it is determined that fault point is at a distance from reference numeral detection mould group, wherein v is the spread speed of pulse；Then,
Remote computer shows position of failure point.
The signal acquisition unit uses ZigBee data acquisition card, including acquisition module and signal to transmit mould
Block；The acquisition module receives signal, and acquisition module received signal is sent to remote computer by signal transmission module.
One, two or three-level early warning pass through the warning module starting of remote computer.
The temperature detecting unit uses LSCI-TZ series of IR heat sensor.
The gas detection cell uses the combustible gas sensor of HSTL-FBSXBJ model.
The arc detection unit is the arc photosensor of ArcSensor22 model.
The invention has the benefit that
The present invention overcomes previous prohibited data detection really and detection factors it is not comprehensive, and cause testing result error greatly
Problem.The present invention by the big actual use situation because of usually precise cable of detection temperature, gas density, electric arc three, and
Operator's remote control, real time on-line monitoring and early warning are realized, a large amount of manpower and material resources are saved, testing result is more quasi-
Really, fault location is also more accurate.
Detailed description of the invention
Fig. 1 is specific flow chart of the invention；
Fig. 2 is that the signal of each unit in the present invention transmits figure.
Specific embodiment
Below in conjunction with attached drawing, the invention will be further described.
As illustrated in fig. 1 and 2, a kind of buried cable partial fault detection method, specific as follows:
Step 1: filling a detection mould group at interval of 100 meter amperes on cable；Detection mould group include temperature detecting unit 1,
Gas detection cell 2, arc detection unit 3, wireless module and failure location unit 4；Failure location unit includes action of low-voltage pulse
Transmitter and pulse receiver；Temperature detecting unit acquires the temperature signal of cable, and temperature signal is exported to signal acquisition
Unit；Temperature detecting unit uses LSCI-TZ series of IR heat sensor；Gas detection cell detects HS and SF6 gas, and will
Testing result is transmitted to signal acquisition unit；Gas detection cell uses the combustible gas sensor of HSTL-FBSXBJ model；Electric arc
The arc signal for the cable discharge moment that detection unit will test is transmitted to signal acquisition unit；Arc detection unit is
The arc photosensor of ArcSensor22 model.
Step 2: each detection mould group is successively numbered in remote computer, the signal acquisition list of each detection mould group
Member is by collected all signals by radioing to remote computer 6；Remote computer is successively to each detection mould group
Signal is judged；The signal deterministic process of each detection mould group is as follows: first determine whether temperature signal, if temperature is higher than 90 DEG C,
Then judge whether there is HS and SF6 gas and arc signal；HS and SF6 gas and arc signal if it does not exist, then illustrate
Cable is in load condition, and remote computer starts three-level early warning；HS or SF6 gas if it exists, but arc signal is not present, then
Illustrate that cable is in critical state, should protect in time, starts second level early warning；If there are HS or SF6 gases for judgement, and there are electric arcs
Signal illustrates that shelf depreciation occurs in cable at this time, starts level-one early warning.
Step 3: starting level-one or when second level early warning, remote computer passes through wireless transmission control signal to opening simultaneously
Wireless module in the detection mould group of dynamic early warning；In the detection mould group for starting early warning, action of low-voltage pulse transmitter receives wireless module
Emit a pulse after the control signal transmitted, while launch time will be transmitted to remote computer through wireless module；Pulse is in event
It propagates, is reflected back when pulse encounters fault point (the uneven point of impedance) in the cable, corresponding pulse connects in barrier cable
It receives device and receives reflection signal, while reflection interval will be transmitted to remote computer through wireless module；Remote computer records low pressure
Impulse sender emits pulse and pulse receiver receives the time difference Δ t of reflection signal, and calculates action of low-voltage pulse transmitter and arrive
The distance between fault point v Δ t/2, so that it is determined that fault point is at a distance from reference numeral detection mould group, it is accurate to realize positioning,
In, v is the spread speed of pulse；Then, remote computer shows position of failure point, and operator carries out fault point
Maintenance and repair avoid the occurrence of electric power accident.
Further, signal acquisition unit uses ZIGBEE data acquisition card, including acquisition module 5 and signal to transmit mould
Block 7；Acquisition module receives signal, and acquisition module received signal is sent to remote computer by signal transmission module.
Further, one, two or three-level early warning pass through remote computer warning module 8 start.
The present invention carries out the use feelings of judgement prediction cable by the variation of detection cable temperature, gas density and electric current
Condition avoids the influence factor considered due to acquisition not comprehensive, and leads to the inaccuracy of testing result.The present invention realizes operator
Member's remote control, real time on-line monitoring and early warning, save a large amount of manpower and material resources, testing result is more accurate, fault location
Also more accurate.
Claims (6)
1. a kind of buried cable partial fault detection method, it is characterised in that: this method is specific as follows:
Step 1: filling a detection mould group, L >=100 meter at interval of L meter ampere on cable；The detection mould group includes temperature
Detection unit, gas detection cell, arc detection unit, wireless module and failure location unit；The failure location unit
Including action of low-voltage pulse transmitter and pulse receiver；Temperature detecting unit acquires the temperature signal of cable, and temperature signal is defeated
Out to signal acquisition unit；Gas detection cell detects HS and SF6 gas, and will test result and be transmitted to signal acquisition unit；Electricity
The arc signal for the cable discharge moment that arc detection unit will test is transmitted to signal acquisition unit；
Step 2: each detection mould group is successively numbered in remote computer, the signal acquisition unit of each detection mould group will
Collected all signals are by radioing to remote computer；Remote computer successively to it is each detection mould group signal into
Row judgement；The signal deterministic process of each detection mould group is as follows: first determining whether temperature signal, if temperature is higher than 90 DEG C, judges
With the presence or absence of HS and SF6 gas and arc signal；HS and SF6 gas and arc signal if it does not exist, then remote computer
Start three-level early warning；HS or SF6 gas if it exists, but arc signal is not present, then remote computer starts second level early warning；If sentencing
Disconnected there are HS or SF6 gases, and there are arc signals, then remote computer starts level-one early warning；
Step 3: it is pre- to starting that remote computer passes through wireless transmission control signal simultaneously when starting level-one or second level early warning
Wireless module in alert detection mould group；In the detection mould group for starting early warning, action of low-voltage pulse transmitter receives wireless module and transmits
Control signal after emit a pulse, while launch time will be transmitted to remote computer through wireless module；Pulse is in failure electricity
It propagates in cable, is reflected back when pulse encounters fault point in the cable, corresponding pulse receiver receives reflection signal, together
When reflection interval will be transmitted to remote computer through wireless module；Remote computer record action of low-voltage pulse transmitter transmitting pulse with
Pulse receiver receives the time difference Δ t of reflection signal, and calculates action of low-voltage pulse transmitter to the distance between fault point v Δ t/
2, so that it is determined that fault point is at a distance from reference numeral detection mould group, wherein v is the spread speed of pulse；Then, remote computation
Machine shows position of failure point.
2. a kind of buried cable partial fault detection method according to claim 1, it is characterised in that: the signal is adopted
Collect unit and uses ZigBee data acquisition card, including acquisition module and signal transmission module；The acquisition module receives
Acquisition module received signal is sent to remote computer by signal, signal transmission module.
3. a kind of buried cable partial fault detection method according to claim 1, it is characterised in that: described one, two
Or three-level early warning passes through the warning module starting of remote computer.
4. a kind of buried cable partial fault detection method according to claim 1, it is characterised in that: the temperature inspection
It surveys unit and uses LSCI-TZ series of IR heat sensor.
5. a kind of buried cable partial fault detection method according to claim 1, it is characterised in that: the gas inspection
Survey the combustible gas sensor that unit uses HSTL-FBSXBJ model.
6. a kind of buried cable partial fault detection method according to claim 1, it is characterised in that: the electric arc inspection
Survey the arc photosensor that unit is ArcSensor22 model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811495010.1A CN109557424B (en) | 2018-12-07 | 2018-12-07 | Underground cable local fault detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811495010.1A CN109557424B (en) | 2018-12-07 | 2018-12-07 | Underground cable local fault detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109557424A true CN109557424A (en) | 2019-04-02 |
| CN109557424B CN109557424B (en) | 2020-08-18 |
Family
ID=65869295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811495010.1A Expired - Fee Related CN109557424B (en) | 2018-12-07 | 2018-12-07 | Underground cable local fault detection method |
Country Status (1)
| Country | Link |
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| CN (1) | CN109557424B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110823480A (en) * | 2019-10-31 | 2020-02-21 | 湖南国奥电力设备有限公司 | Underground cable fault early warning method and device based on gas detection |
| CN112505471A (en) * | 2020-09-29 | 2021-03-16 | 贵州电网有限责任公司 | Transient disturbance-based early fault early warning and positioning system and method for looped network cable |
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| CN110823480A (en) * | 2019-10-31 | 2020-02-21 | 湖南国奥电力设备有限公司 | Underground cable fault early warning method and device based on gas detection |
| CN110823480B (en) * | 2019-10-31 | 2022-02-01 | 湖南国奥电力设备有限公司 | Underground cable fault early warning method and device based on gas detection |
| CN112505471A (en) * | 2020-09-29 | 2021-03-16 | 贵州电网有限责任公司 | Transient disturbance-based early fault early warning and positioning system and method for looped network cable |
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| Publication number | Publication date |
|---|---|
| CN109557424B (en) | 2020-08-18 |
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