CN105699856B - A kind of cable fault positioning system and method based on intelligent acquisition with analysis - Google Patents
A kind of cable fault positioning system and method based on intelligent acquisition with analysis Download PDFInfo
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- CN105699856B CN105699856B CN201610240293.XA CN201610240293A CN105699856B CN 105699856 B CN105699856 B CN 105699856B CN 201610240293 A CN201610240293 A CN 201610240293A CN 105699856 B CN105699856 B CN 105699856B
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
Abstract
The present invention relates to a kind of cable fault positioning systems and method based on intelligent acquisition with analysis.The cable is formed by connecting by multiple lengths and the different cable of cross-sectional area by insulating joint, the cable fault positioning system includes failure cable, reference cable, shorting stub (6), earthing switch, data acquisition unit, cable resistance detection unit and processor unit (5), the failure cable and reference cable one end are reference edge, the other end is test lead, failure cable and reference cable reference edge are connected by shorting stub (6), failure cable reference edge also passes through ground switch earthing, the cable resistance detection unit difference connecting fault cable and the test lead of reference cable, the data acquisition unit and cable resistance detection unit is connected to processor unit (5).Compared with prior art, the present invention has the advantages that convenient test, high degree of automation, fault location result precision is high.
Description
Technical field
The present invention relates to a kind of cable fault positioning system and method, more particularly, to one kind based on intelligent acquisition and analysis
Cable fault positioning system and method.
Background technology
High-tension cable is taken up an area less with it, lays convenience, personal safety guarantee, power supply reliability is high, maintenance workload is few etc.
Advantage is widely applied in high voltage power transmission and transforming network.Cable and a complicated system in network, may contain
GIS terminal；T connectors or Y-shaped connector may be contained；It may be long transmission line, include multiple cross interconnected sections.Cable once insulate
Breakdown, often several days can not fault point, delay power-on time, reduce power supply reliability.
Murray bridge methods are mainly utilized for cable fault positioning in high-voltage and ultra-high power transmission and transformation network currently on the market
With two kinds of traveling wave bounce technique.
Murray bridge methods are the classical ways to puncturing point location, and A phases are connected by such as Fig. 1 by shorting stub with B,
But electric bridge can only obtain permillage P ‰, artificial calculating trouble point distance, i.e. distance L of the x terminal away from trouble point F in Fig. 11, calculate
Formula is as follows：
L1=(2L+L 'd) × P ‰,
Wherein, L is per the overall length of phase cable, LdFor short circuit line length, sectional areas of the S for cable, SdFor cutting for shorting stub
Area, since shorting stub participates in bridge balance, it is therefore desirable to be converted into length prismatic with cable and participate in calculating, shorting stub
The smaller shorting stub of generally use sectional area, the short circuit cross-sectional area S so as to measuredError is larger, leads to L 'dError is also very big,
Positioning accuracy is seriously affected.It is assumed that it is 1000m that cable length, which is L, sectional area S is 1000mm2, short circuit line length LdFor 10m,
Sectional area SdFor 16mm2(actual cross-sectional area 12mm2), permillage reading is 30 ‰ after bridge balance.Table 1 is test result pair
Compare table, it can be seen that test value 63m smaller than theoretical value has larger error.
1 test result contrast table of table
| Cable overall length L=2L+L 'd | Trouble point distance L1=(2L+L 'd)×P‰ | |
| Theoretical value | 2833m | L1=850m |
| Test value | 2625m | L1=787m |
In addition also under some scenes, Murray bridge methods can not also position, respectively：
(1) load current for closing on operation cable generates power frequency magnetic field, in galvanometric 2 end M, X-shaped into can exceed that
The power-frequency voltage of 200V, and DC potential difference used for positioning only millivolt level.Therefore, galvanometer is easily damaged or cannot
Balance participates in bridge balance because exchanging, and localization ratio error is very big；
(2) cable run is long, and every section of cable conductor sectional area is different, and conductor material has copper core or aluminium core, needs manually handle
Tested cable is converted into material identical with cross-section with relief cable, and heavy workload error is also big.
Traveling wave bounce technique is mainly secondary pulse process, three times impulse method and pulse current method.But because high-tension cable possesses friendship
Fork interconnection, T connectors, wave impedance generate mutation, make positioning back wave sufficiently complex, it is difficult to position, high-voltage pulse also has in the point
Energy loss, it is difficult to reach at a distance.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind is based on intelligent acquisition
With the complicated cable fault positioning system and method for analysis.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of cable fault positioning system based on intelligent acquisition with analysis, the cable is by multiple lengths and cross section
The different cable of product is formed by connecting by insulating joint, and the cable fault positioning system includes failure cable, reference
Cable, shorting stub, earthing switch, data acquisition unit, cable resistance detection unit and processor unit, the failure cable
It is reference edge with reference cable one end, the other end is test lead, and failure cable is connected with reference cable reference edge by shorting stub,
Failure cable reference edge also passes through ground switch earthing, cable resistance detection unit difference connecting fault cable and reference
The test lead of cable, the data acquisition unit and cable resistance detection unit are connected to processor unit；
Data acquisition unit acquires the cable information of each section of cable in failure cable and is unitized to obtain cable unification
Change total length L, when earthing switch is opened, cable resistance detection unit detection voltage and current information is simultaneously sent to processor unit,
Processor unit obtains failure cable test lead to the cable resistance R between trouble point1, when earthing switch is closed, cable resistance inspection
It surveys unit detection voltage and current information and is sent to processor unit, processor unit obtains faulty cable test lead to reference edge
Cable resistance R2, processor unit is according to Lx=L × (R1/R2) obtain failure cable test lead to trouble point it is unitized away from
From Lx, and then processor unit is according to LxFailure cable test lead is conversed to the reality of trouble point with the cable information of each section of cable
Border distance Lx′。
The data acquisition unit includes the digit manipulation knob for being manually entered cable information, digit manipulation rotation
Button connection processing device unit.
The cable information includes length of cable, cable cross-sections product and cable resistance rate.
The cable resistance detection unit includes high-voltage constant current source, sampling resistor, current collector and voltage collector,
The high-voltage constant current source is connected to sampling resistor by sampling resistor connecting fault wireline test end, the current collector
Both ends, the voltage collector are parallel between failure cable test lead and reference cable test lead；
When earthing switch is opened, current collector acquisition electric current is I1, voltage collector collection voltages are U1, so as to obtain
Cable resistance R1=U1/I1；When earthing switch is closed, current collector acquisition electric current is I2, voltage collector collection voltages be U2,
So as to obtain cable resistance R2=U2/I2。
The cable fault positioning system further includes display unit, the display unit connection processing device unit.
A kind of cable fault localization method based on intelligent acquisition with analysis, this method comprises the following steps：
(1) by each section of cable in failure cable from test lead successively marked as Di, wherein i=1,2 ... n, n are composition
The total hop count of cable of failure cable, processor unit (5) acquire i-th section of cable D in failure cableiCable information and be sent to
Processor unit (5), wherein i-th section of cable DiCable information include length of cable be Li, sectional area SiWith cable resistance rate
For ρi；
(2) processor unit (5) cable on the basis of first segment cable unites to second segment cable to n-th section of cable
One changes, and calculates second segment cable according to the following formula to the unitized length of n-th section of cable：
Wherein j=2,3 ... n；
(3) processor unit (5) obtains faulty cable and unitizes total length L：
(4) earthing switch is opened, cable resistance detection unit obtains failure cable test lead to the cable electricity between trouble point
Hinder R1；
(5) earthing switch is closed, cable resistance detection unit obtains faulty cable test lead to the cable electricity between reference edge
Hinder R2；
(6) according to Lx=L × (R1/R2) failure cable test lead is calculated to the unitized distance L of trouble pointx；
(7) failure cable test lead is conversed according to the following formula to the actual range L of trouble pointx′：
Wherein, k=1,2 ... j, p=2,3 ... j.
Compared with prior art, the invention has the advantages that：
(1) data acquisition unit of the present invention acquires the cable information of each section of cable in failure cable and is unitized to obtain
Cable unitizes total length L, and different materials different cross-sectional cable in failure cable is converted into same cross-sectional same conductor material
The equivalent cable length of material, whole process are examined by processor unit voluntarily operation, high degree of automation using cable resistance
The resistive voltage ratio of unit detection is surveyed, anti-to release the distance of trouble point and test lead in failure cable, test result precision is high；
(2) Fault Locating Method of the invention can effectively improve cable fault search efficiency, shorten power off time, improve and supply
Electric reliability has good market application value.
Description of the drawings
Fig. 1 is Murray bridge method fault location principle schematics；
Fig. 2 is threephase cable system line figure；
Fig. 3 is threephase cable system failure assignment test first step functional arrangement figure；
Fig. 4 is threephase cable system failure assignment test second step functional arrangement figure.
In figure, 1 is high-voltage constant current source, and 2 be sampling resistor, and 3 be current collector, and 4 be voltage collector, and 5 be processor
Unit, 6 be shorting stub, and J1 is the first conductive clip, and J2 is the second conductive clip, and J3 is third conductive clip, and J4 is the 4th conductive clip.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
A kind of cable fault positioning system based on intelligent acquisition with analysis, cable by multiple lengths and cross-sectional area not
Identical cable is formed by connecting by insulating joint, cable fault positioning system include failure cable, reference cable, shorting stub 6,
Earthing switch, data acquisition unit, cable resistance detection unit and processor unit 5, failure cable and reference cable one end are
Reference edge, the other end are test lead, and failure cable and reference cable reference edge are connected by shorting stub 6, and shorting stub 6 is using thin short
Wiring, failure cable reference edge also pass through ground switch earthing, cable resistance detection unit difference connecting fault cable and reference
The test lead of cable, data acquisition unit and cable resistance detection unit are connected to processor unit 5；Data acquisition unit is adopted
The cable information and unitize of each section of cable obtains cable and unitizes total length L in collection failure cable, earthing switch opening
When, cable resistance detection unit detection voltage and current information is simultaneously sent to processor unit 5, and processor unit 5 obtains failure electricity
Cable test end is to the cable resistance R between trouble point1, when earthing switch is closed, cable resistance detection unit detection voltage and current letter
It ceases and is sent to processor unit 5, processor unit 5 obtains faulty cable test lead to the cable resistance R of reference edge2, processing
Device unit 5 is according to Lx=L × (R1/R2) failure cable test lead is obtained to the unitized distance L of trouble pointx, and then processor list
Member 5 is according to LxFailure cable test lead is conversed to the actual range L of trouble point with the cable information of each section of cablex′。
Data acquisition unit includes the digit manipulation knob for being manually entered cable information, digit manipulation knob connection processing device
Unit 5, is equivalent to computer keyboard, it is possible to provide user carries out the alignment system parameter setting and alignment system is operated
Control.Cable information includes length of cable, cable cross-sections product and cable resistance rate.Cable resistance detection unit includes high voltage and constant current
Source 1, sampling resistor 2, current collector 3 and voltage collector 4, high-voltage constant current source 1 are surveyed by 2 connecting fault cable of sampling resistor
End is tried, current collector 3 is connected to 2 both ends of sampling resistor, and voltage collector 4 is parallel to failure cable test lead and reference cable
Between test lead；When earthing switch is opened, it is I that current collector 3, which acquires electric current,1, 4 collection voltages of voltage collector are U1, so as to
Obtain cable resistance R1=U1/I1；When earthing switch is closed, it is I that current collector 3, which acquires electric current,2, voltage collector 4 acquire electricity
It presses as U2, so as to obtain cable resistance R2=U2/I2.The cable fault positioning system further includes display unit, display unit connection
Processor unit 5.
A kind of cable fault localization method based on intelligent acquisition with analysis, this method comprises the following steps：
(1) by each section of cable in failure cable from test lead successively marked as Di, wherein i=1,2 ... n, n are composition
The total hop count of cable of failure cable, processor unit 5 acquire i-th section of cable D in failure cableiCable information and be sent to place
Device unit 5 is managed, wherein i-th section of cable DiCable information include length of cable be Li, sectional area SiIt is with cable resistance rate
ρi；
(2) cable on the basis of first segment cable of processor unit 5 carries out second segment cable to n-th section of cable unification
Change, calculate second segment cable according to the following formula to the unitized length of n-th section of cable：
Wherein j=2,3 ... n；
(3) processor unit 5 obtains faulty cable and unitizes total length L：
(4) earthing switch is opened, cable resistance detection unit obtains failure cable test lead to the cable electricity between trouble point
Hinder R1；
(5) earthing switch is closed, cable resistance detection unit obtains faulty cable test lead to the cable electricity between reference edge
Hinder R2；
(6) according to Lx=L × (R1/R2) failure cable test lead is calculated to the unitized distance L of trouble pointx；
(7) failure cable test lead is conversed according to the following formula to the actual range L of trouble pointx′：
Wherein, k=1,2 ... j, p=2,3 ... j.
By taking threephase cable system line as an example, fault potential is carried out using above-mentioned cable fault positioning system and method.Such as Fig. 2
Threephase cable system line figure is shown, containing A, B, C three-phase, one end is outdoor terminal, the outer terminal-pair of A, B, C three phase user's in figure
It should be AN1, BN1 and CN1, the other end is gas insulated terminal (GIS), and the three-phase, gas insulated terminal of A, B, C corresponds in figure
AG1, BG1 and CG1, threephase cable by three segment length and the different cable of cross-sectional area by insulating joint connect and
Into insulating joint is respectively AIJ1, AIJ2, BIJ1, BIJ2, CIJ1 and CIJ2 in figure, and at C phases F, RF is failure electricity for trouble point
Resistance.
As shown in Figure 3, Figure 4, C phase faults cable, it is reference cable, failure cable and reference cable to choose A phases cable
Gas-insulated end is reference edge, and outdoor terminal is test lead, and failure cable and reference cable reference edge are connected by shorting stub 6,
Failure cable reference edge is also by ground switch earthing, and earthing switch is K3 in figure, and 6 one end of shorting stub passes through third conductive clip J3
Reference cable reference edge is connected, the other end passes through the 4th conductive clip J4 connecting fault cable reference edges, earthing switch connection the 4th
Conductive clip J4.Cable resistance detection unit includes high-voltage constant current source 1, sampling resistor 2, current collector 3 and voltage collector 4,
High-voltage constant current source 1 passes through the on second switch K2 and faulty cable by 2 connecting fault wireline test end of sampling resistor in figure
Two conductive clip J2 connections, while sampling resistor 2 also passes through the first conductive clip J1 on first switch K2 connection reference cables, electric current
Collector 3 is connected to 2 both ends of sampling resistor, and 4 both ends of voltage collector connect the first conductive clip J1 and the second conductive clip J2 respectively,
Current collector 3 and voltage collector 4 are connected to processor unit 5.
Before test, the cable information of three sections of cables first into 5 input fault cable of processor unit is long including cable
Spend L1、L2、L3, sectional area S1、S2、S3With cable resistance rate ρ1、ρ2、ρ3.Processor unit 5 is handled automatically, can be calculated
Each section of cable insulated joint location information, that is, calculate the percentage for accounting for total track length of each insulated cable connector, and can lead to
Tabular form is crossed to be shown in display unit.
Then assignment test, the first step are carried out by two step methods of testing, as shown in figure 3, first switch K1 is opened in figure, the
Two switch K2 are closed, and earthing switch K3 is opened, and current collector 3 measures electric current as I1, 4 collection voltages of voltage collector are U1, by
It is opened in earthing switch K3, therefore, reference cable test lead, reference cable reference edge, failure cable reference edge and failure at this time
Point current potential is identical, and electric current is flowed out from high-voltage constant current source 1 flows through faulty cable test lead, and pass through failure electricity by sampling resistor 2
Resistance RF flows back to the earth, forms current loop, therefore the electric current I measured1For faulty cable test lead to the electric current between trouble point
Size, voltage U1For faulty cable test lead to the voltage swing between trouble point.Second step, as shown in figure 4, first switch K1
It opens, second switch K2 is closed, and earthing switch K3 is closed, and current collector 3 measures electric current as I2, voltage collector 4 acquires electricity
It presses as U2, since earthing switch K3 is grounded, electric current is flowed out from high-voltage constant current source 1 at this time flows through faulty cable by sampling resistor 2
Test lead, and be flowed directly to failure cable reference edge and flow to the earth, form current loop, therefore the electric current I measured2For failure
Testing lines end is to the size of current between reference edge, voltage U2It is big to the voltage between reference edge for faulty cable test lead
It is small.
The small DC voltage U of acquisition1、U2With electric current I1、I2Processor unit 5 is sent to, processor unit 5 carries out intelligence
Energyization calculates, and further filters, and rejects garbage, analysis calculating is carried out to data, so as to obtain the position of Method of Cable Trouble Point
Information.The specific cable on the basis of first segment cable of processor unit 5, carries out second segment cable and the 3rd section of cable unification
Change, calculate the unitized length of the 3rd section of cable of second segment cable according to the following formula：
And then it obtains faulty cable and unitizes total length L：
L=L1+L2′+L3′；
Faulty cable test lead is obtained to the cable resistance R between trouble point1=U1/I1, obtain faulty cable test lead extremely
Cable resistance R between reference edge2=U2/I2, according to Lx=L × (R1/R2) failure cable test lead is calculated to trouble point
Unitized distance Lx.Then in the cable cross-sections product according to each section of cable and resistivity is counter is unitized, each section of line is obtained
The cable information of cable converses failure cable test lead to the actual range L of trouble pointx', specially：
The result finally measured can be shown by display unit.
Claims (6)
1. a kind of cable fault positioning system based on intelligent acquisition with analysis, the cable is by multiple lengths and cross-sectional area
Different cable is formed by connecting by insulating joint, which is characterized in that the cable fault positioning system includes failure
Cable, reference cable, shorting stub (6), earthing switch, data acquisition unit, cable resistance detection unit and processor unit
(5), the failure cable and reference cable one end are reference edge, and the other end is test lead, failure cable and reference cable ginseng
It examines end to connect by shorting stub (6), failure cable reference edge also passes through ground switch earthing, the cable resistance detection unit
The test lead of connecting fault cable and reference cable respectively, the data acquisition unit and cable resistance detection unit are all connected with
To processor unit (5)；
It the cable information of each section of cable and is unitized to obtain cable and is unitized always in data acquisition unit acquisition failure cable
Length L, when earthing switch is opened, cable resistance detection unit detection voltage and current information is simultaneously sent to processor unit (5), locates
It manages device unit (5) and obtains failure cable test lead to the cable resistance R between trouble point1, when earthing switch is closed, cable resistance inspection
It surveys unit detection voltage and current information and is sent to processor unit (5), processor unit (5) obtains faulty cable test lead extremely
The cable resistance R of reference edge2, processor unit (5) is according to Lx=L × (R1/R2) failure cable test lead is obtained to trouble point
Unitized distance Lx, and then processor unit (5) is according to LxFailure cable test lead is conversed with the cable information of each section of cable extremely
The actual range L of trouble pointx′。
2. a kind of cable fault positioning system based on intelligent acquisition with analysis according to claim 1, which is characterized in that
The data acquisition unit includes the digit manipulation knob for being manually entered cable information, the digit manipulation knob junction
Manage device unit (5).
3. a kind of cable fault positioning system based on intelligent acquisition with analysis according to claims 1 or 2 any one,
It is characterized in that, the cable information includes length of cable, cable cross-sections product and cable resistance rate.
4. a kind of cable fault positioning system based on intelligent acquisition with analysis according to claim 1, which is characterized in that
The cable resistance detection unit includes high-voltage constant current source (1), sampling resistor (2), current collector (3) and voltage collector
(4), the high-voltage constant current source (1) passes through sampling resistor (2) connecting fault wireline test end, the current collector (3)
Sampling resistor (2) both ends are connected to, the voltage collector (4) is parallel to failure cable test lead and reference cable test lead
Between；
When earthing switch is opened, current collector (3) acquisition electric current is I1, voltage collector (4) collection voltages are U1, so as to obtain
Take cable resistance R1=U1/I1；When earthing switch is closed, current collector (3) acquisition electric current is I2, voltage collector (4) acquisition
Voltage is U2, so as to obtain cable resistance R2=U2/I2。
5. a kind of cable fault positioning system based on intelligent acquisition with analysis according to claim 1, which is characterized in that
The cable fault positioning system further includes display unit, the display unit connection processing device unit (5).
6. a kind of method using as described in claim 1 based on intelligent acquisition with the cable fault positioning system of analysis,
It is characterized in that, this method comprises the following steps：
(1) by each section of cable in failure cable from test lead successively marked as Di, wherein i=1,2 ... n, n are composition failure
The total hop count of cable of cable, processor unit (5) acquire i-th section of cable D in failure cableiCable information and be sent to processing
Device unit (5), wherein i-th section of cable DiCable information include length of cable be Li, sectional area SiIt is with cable resistance rate
ρi；
(2) processor unit (5) cable on the basis of first segment cable unitizes to second segment cable to n-th section of cable,
Second segment cable is calculated according to the following formula to the unitized length of n-th section of cable：
Wherein j=2,3 ... n；
(3) processor unit (5) obtains faulty cable and unitizes total length L：
(4) earthing switch is opened, cable resistance detection unit obtains failure cable test lead to the cable resistance R between trouble point1；
(5) earthing switch is closed, cable resistance detection unit obtains faulty cable test lead to the cable resistance R between reference edge2；
(6) according to Lx=L × (R1/R2) failure cable test lead is calculated to the unitized distance L of trouble pointx；
(7) failure cable test lead is conversed according to the following formula to the actual range L of trouble pointx′：
Wherein, k=1,2 ... j, p=2,3 ... j.
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| CN107202940B (en) * | 2017-07-17 | 2019-07-12 | 国网上海市电力公司 | A kind of the equivalent length autoreduction and fault point positioning method of cable fault |
| DE102017122684A1 (en) * | 2017-09-29 | 2019-04-04 | Lisa Dräxlmaier GmbH | TEST APPARATUS AND TEST METHOD FOR CHECKING A DATA CABLE FOR A POWER VEHICLE THROUGH CONSTANT CURRENT SOURCE |
| CN110346688B (en) * | 2019-07-31 | 2021-03-02 | 广东电网有限责任公司 | Method for rapidly judging and positioning faults of high-voltage complex cables of 110kV or above in segmented manner |
| CN112114273A (en) * | 2020-08-20 | 2020-12-22 | 深圳供电局有限公司 | Method and device for positioning direct current ground fault point |
| CN111999617A (en) * | 2020-09-04 | 2020-11-27 | 广东电网有限责任公司肇庆供电局 | Simulation test device for cable fault simulation by using retreating line |
| CN114924109B (en) * | 2022-07-20 | 2022-11-29 | 深圳市英特瑞半导体科技有限公司 | Method, circuit and device for testing low-power chip current |
| CN116718875B (en) * | 2023-08-10 | 2023-12-15 | 国网江苏省电力有限公司电力科学研究院 | Positioning method and instrument for sheath layer grounding in high-voltage cable single-end grounding system |
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| JPH04299273A (en) * | 1991-03-28 | 1992-10-22 | Kansai Electric Power Co Inc:The | Locating method for fault point using right-angled component system |
| CN102305901B (en) * | 2011-06-03 | 2014-11-12 | 西安福润德电子科技有限公司 | Method for detecting cable fault point by impact oscillating wave principle |
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| CN102759686A (en) * | 2012-07-26 | 2012-10-31 | 山东科汇电力自动化有限公司 | Method for locating power cable faults |
| CN103499773A (en) * | 2013-10-08 | 2014-01-08 | 西安恒讯电力科技有限公司 | Cable fault testing device capable of detecting through eight-pulse method |
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