CN108646144A - A kind of offline distance measuring method of high voltage single-core cable short trouble, apparatus and system - Google Patents
A kind of offline distance measuring method of high voltage single-core cable short trouble, apparatus and system Download PDFInfo
- Publication number
- CN108646144A CN108646144A CN201810825654.6A CN201810825654A CN108646144A CN 108646144 A CN108646144 A CN 108646144A CN 201810825654 A CN201810825654 A CN 201810825654A CN 108646144 A CN108646144 A CN 108646144A
- Authority
- CN
- China
- Prior art keywords
- cable
- metal sheath
- short trouble
- high voltage
- core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to a kind of offline distance measuring method of high voltage single-core cable short trouble, apparatus and systems, its method adds d. c. voltage signal, and the current signal at the metal sheath both ends of acquisition cable respectively between being included in the core of cable and the metal sheath of ground connection that short trouble occurs；Correspond to the Leakage Current at the metal sheath both ends for determining cable respectively according to the current signal at the metal sheath both ends of cable；Position of failure point is calculated according to the Leakage Current at the metal sheath both ends of cable.The offline distance measuring method of high voltage single-core cable short trouble of the present invention, by to the alive method of failure phase cable, measure the leakage current in cable metal sheath, and by carrying out fault point ranging to the analysis of leakage current, it is breakdown again it is not necessary that fault point will be brought the voltage up to, under the premise of ensureing safety, improve range accuracy, and the fault point suitable for metallicity failure, high resistive fault and flashover failure is accurately positioned, insulation resistance no requirement (NR) to test cable.
Description
Technical field
The present invention relates to cable fault field of measuring technique more particularly to a kind of high voltage single-core cable short trouble to survey offline
Away from method, apparatus and system.
Background technology
Current offline fault distance-finding method is broadly divided into 3 kinds according to measuring principle：1) bridge method.It is by this survey cable
The failure phase and non-faulting phase short circuit of terminal, by line resistance of the test failure cable from measurement end to fault point, then according to
The fault distance-finding method that fault distance is calculated according to resistrivity meter either tests out cable fault section and the voltage drop of overall length section
Ratio, then be multiplied with overall length and calculate a kind of method of fault distance.Test failure point insulating resistance is generally used in youngster 10,000
The distance of cable fault within Europe, measurement error are larger.2) Low Voltage Impulse Method.Cardinal principle is to pass through instrument in cable one end
Low voltage pulse signal is inputted into tested cable, which includes failure along cable distribution to the unmatched fault point of wave impedance
When point, cable termination and transition joint, which will will produce reflection, and be got off back to measurement end by instrument record.
Signal is reflected by record and emits the time difference of signal, so that it may to measure fault distance.The method has easy to operate, test essence
The advantages that high is spent, but high resistive fault and flashover failure cannot be tested.3) high voltage pulse method.The method is occurred by high-voltage signal
Device applies high direct voltage signal or impulse high voltage signal into tested failure cable, its fault point moment is punctured, and generates one
Voltage traveling wave signal, signal roundtrip propagation between the measurement end and fault point of tested cable, in high voltage direct current generator
High-pressure side receives and converses time and the pulse signal of the voltage traveling wave signal round trip by linearly dividing coupling apparatus
Spread speed is multiplied and the method that calculates fault distance.There is distance mearuring equipment with high-pressure section when the shortcomings that this method is test
Direct electric connecting member, safety is poor, and more demanding to the technical parameter of test equipment.
Invention content
The technical problem to be solved by the present invention is to solve the above shortcomings of the prior art and to provide a kind of high voltage single-core cables
The offline distance measuring method of short trouble, apparatus and system.
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of offline ranging of high voltage single-core cable short trouble
Method includes the following steps：
Step 1：D. c. voltage signal is added between the core of cable and the metal sheath of ground connection that short trouble occurs,
And the current signal at the metal sheath both ends of cable is acquired respectively；
Step 2：Correspond to the metal sheath for determining cable respectively according to the current signal at the metal sheath both ends of the cable
The Leakage Current at both ends；
Step 3：Position of failure point is calculated according to the Leakage Current at the metal sheath both ends of the cable.
The beneficial effects of the invention are as follows：The offline distance measuring method of high voltage single-core cable short trouble of the present invention passes through a pair event
Hinder the alive method of phase cable, measures the leakage current in cable metal sheath, and pass through the analysis progress to leakage current
Fault point ranging, it is breakdown again it is not necessary that fault point will be brought the voltage up to, under the premise of ensureing safety, improve ranging
Precision, and the fault point suitable for metallicity failure, high resistive fault and flashover failure is accurately positioned, to the exhausted of test cable
Edge resistance no requirement (NR).
Based on the above technical solution, the present invention can also be improved as follows：
Further：In the step 1, by distinguishing pre-set electricity between the both ends and ground of the metal sheath in cable
Current transformer detects the current signal at the metal sheath both ends of the cable.
The advantageous effect of above-mentioned further scheme is：It can accurately be detected by the current transformer and flow through cable
Metal sheath both ends current signal, convenient for subsequently according to the current signal at the metal sheath both ends of the cable determine reveal
Electric current, and then determine the position of fault point.
Further：The step 2 specifically comprises the following steps：
Step 21：Fast Fourier Transform (FFT) is carried out to the current signal at the metal sheath both ends of the cable, obtains cable
Metal sheath both ends original signal；
Step 22：The amplitude for extracting the original signal DC component obtains letting out for the metal sheath both ends of the cable
Reveal electric current ILAnd IR。
The advantageous effect of above-mentioned further scheme is：It is carried out by the current signal at the metal sheath both ends to the cable
Fast Fourier Transform (FFT) and DC component amplitude extraction process can remove the interference signals such as present collected noise so that
Testing result is more accurate.
Further：It is described that failure point is calculated according to the metal sheath both ends Leakage Current of the cable in the step 3
The calculation formula set is：
Wherein, L is cable length, RS0It is constant, R for the unit length metal sheath equivalent resistance of cableg1And Rg2Point
Not Wei cable metal sheath two-terminal-grounding resistance, ILAnd IRThe respectively Leakage Current at the metal sheath both ends of cable, xfFor event
Barrier is put at a distance between cable application voltage location.
The advantageous effect of above-mentioned further scheme is：Pass through the gold for the cable that above-mentioned formula can be obtained according to abovementioned steps
Belong to the Leakage Current at sheath both ends and related known parameters, accurately calculates fault point and cable and apply at voltage location it
Between distance, consequently facilitating accurately determining the fixed exact position of failure.
The present invention also provides a kind of offline range unit of high voltage single-core cable short trouble, including DC power supply, two
Current transformer and processor；
The power supply, for adding direct current between the core of cable and the metal sheath of ground connection that short trouble occurs
Press signal；
Described two current transformers are correspondingly arranged between the both ends and ground of cable ends metal sheath in advance respectively, and
Current signal for the metal sheath both ends for acquiring cable；
Processor is used to correspond to the metal for determining cable respectively according to the current signal at the metal sheath both ends of the cable
The Leakage Current at sheath both ends, and position of failure point is calculated according to the Leakage Current at the metal sheath both ends of the cable.
The beneficial effects of the invention are as follows：The offline range unit of high voltage single-core cable short trouble of the present invention, passes through power supply
To the alive method of failure phase cable, current transformer measures the leakage current in cable metal sheath, and passes through processor
Fault point ranging is carried out to the analysis of leakage current, it is breakdown again it is not necessary that fault point will be brought the voltage up to, ensureing safety
Property under the premise of, improve range accuracy, and the essence of the fault point suitable for metallicity failure, high resistive fault and flashover failure
Determine position, the insulation resistance no requirement (NR) to test cable.
Based on the above technical solution, the present invention can also be improved as follows：
Further：The offline range unit of high voltage single-core cable short trouble further includes transformer and rectified current,
The power supply is AC power, the both ends electrical connection corresponding with the both ends of the transformer respectively of the power supply, institute
State the both ends electrical connection corresponding with two input terminals of the rectification circuit respectively of the secondary coil of transformer, the rectified current
One output end on road is electrically connected with cable one end that short trouble occurs, another output end ground connection.
The advantageous effect of above-mentioned further scheme is：It is equipped with transformer by using AC power, load can be adjusted and existed
Voltage swing between cable core and metal sheath, convenient for being closed for the different suitable transformer matchings of cable match selection
Ac voltage signal is converted to d. c. voltage signal by suitable voltage by rectification circuit, can be existed in this way to avoid due to load
AC signal between cable core and metal sheath generates electromagnetic induction, influences the detection accuracy of Leakage Current.
Further：The transformer is adjustable transformer.
The advantageous effect of above-mentioned further scheme is：By the way that adjustable transformer is arranged, same cable load can be directed to not
It with the d. c. voltage signal of size, takes multiple measurements, improves measurement accuracy, while being also possible that whole device is applicable in difference
The fault detect of cable enhances its versatility.
Further：The processor corresponds to according to the current signal at the metal sheath both ends of the cable and determines cable respectively
The Leakage Current at metal sheath both ends be implemented as：
Fast Fourier Transform (FFT) is carried out to the current signal at the metal sheath both ends of the cable, obtains the metal shield of cable
The original signal at layer both ends；
The amplitude for extracting the original signal DC component obtains the Leakage Current I at the metal sheath both ends of the cableL
And IR。
The advantageous effect of above-mentioned further scheme is：It is carried out by the current signal at the metal sheath both ends to the cable
Fast Fourier Transform (FFT) and DC component amplitude extraction process can remove the interference signals such as present collected noise so that
Testing result is more accurate.
Further：The processor calculates position of failure point according to the Leakage Current at the metal sheath both ends of the cable
Specific formula for calculation is：
Wherein, L is cable length, RS0It is constant, R for the unit length metal sheath equivalent resistance of cableg1And Rg2Point
Not Wei cable metal sheath two-terminal-grounding resistance, ILAnd IRThe respectively Leakage Current at the metal sheath both ends of cable, xfFor event
Barrier is put at a distance between cable application voltage location.
The advantageous effect of above-mentioned further scheme is：Pass through the gold for the cable that above-mentioned formula can be obtained according to abovementioned steps
Belong to the Leakage Current at sheath both ends and related known parameters, accurately calculates fault point and cable and apply at voltage location it
Between distance, consequently facilitating accurately determining the fixed exact position of failure.
The present invention also provides a kind of offline range-measurement systems of high voltage single-core cable short trouble, it is characterised in that：Including nothing
Line communicating circuit, monitor terminal and at least one offline range unit of high voltage single-core cable short trouble, the processing
Device is electrically connected with the wireless communication line, and the wireless communication line is wirelessly connected with the monitor terminal.
The offline range-measurement system of high voltage single-core cable short trouble of the present invention, it is offline by high voltage single-core cable short trouble
Range unit measures position of failure point information, and is sent to monitor terminal via wireless communication line, is easy to implement remote monitoring,
It is simple and convenient, efficient quick.
Description of the drawings
Fig. 1 is the offline distance measuring method flow diagram of high voltage single-core cable short trouble of the present invention；
Fig. 2 is formula high voltage single-core cable monitoring point schematic diagram single-end earthed；
Fig. 3 is the circuit connection diagram of the high voltage single-core cable Leakage Current detection of the present invention；
Fig. 4 is the schematic equivalent circuit of Fig. 3.
Specific implementation mode
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in Figure 1, a kind of offline distance measuring method of high voltage single-core cable short trouble, includes the following steps：：
Step 1：D. c. voltage signal is added between the core of cable and the metal sheath of ground connection that short trouble occurs,
And the current signal at the metal sheath both ends of cable is acquired respectively；
Step 2：Correspond to the metal sheath for determining cable respectively according to the current signal at the metal sheath both ends of the cable
The Leakage Current at both ends；
Step 3：Position of failure point is calculated according to the Leakage Current at the metal sheath both ends of the cable.
The offline distance measuring method of high voltage single-core cable short trouble of the present invention, by the alive side of failure phase cable
Method measures the leakage current in cable metal sheath, and by carrying out fault point ranging to the analysis of leakage current, being not necessarily to will
It is breakdown again that voltage is increased to fault point, under the premise of ensureing safety, improves range accuracy, and be suitable for metallicity
The fault point of failure, high resistive fault and flashover failure is accurately positioned, the insulation resistance no requirement (NR) to test cable.
The earthing mode of Voltage Cable Lines Construction metal sheath include mainly single-end earthed, two sides earth and cross connection grounding
Three kinds, the circuit both ends metal sheath of wherein two sides earth and cross interconnected mode is all directly grounded, another under mode single-end earthed
One end metal sheath is grounded through protector.It, need to be short by protector when technical scheme of the present invention is applied to mode single-end earthed
Connecing makes the other end be directly grounded.Fig. 2 shows typical mode, wherein high-tension cable cores single-end earthed to be connected directly, metal
Sheath both ends are directly grounded.
In cable run as shown in Figure 2, after breakdown fault occurs in circuit any position, carbon can be formed in fault point
Change channel, no matter whether high-tension cable oversheath breakdown, short-circuit breakdown channel all can run through major insulation connecting cable core with
Metal sheath.And the resistance in the channel that is carbonized is far smaller than the insulation resistance of main before puncturing, after failure in the core of one section of cable and
Making alive (not puncturing) between metal sheath, the leakage current of fault point will be far longer than the leakage current of other positions.Therefore,
Can by after failure in the increase failure judgement point position of core and metal sheath both ends making alive leakage current.The present invention is exactly
Based on this.
In an embodiment of the present invention, in the step 1, the Voltage Cable Lines Construction that is directly grounded for both ends metal sheath
Structure (if circuit is mode single-end earthed, needs, in non_direct ground end short circuit sheath protector, to keep both ends metal sheath straight
Ground connection), current transformer is installed between circuit both ends metal sheath and ground, as shown in Fig. 2, the leakage electricity that both ends detect
Stream uses I respectivelyLAnd IRIt indicates.By distinguishing pre-set current transformer between the both ends and ground of the metal sheath in cable
The current signal at the metal sheath both ends of (circle indicates current transformer in figure) the detection cable.Pass through the Current Mutual Inductance
Device can accurately detect the current signal at the metal sheath both ends for flowing through cable, convenient for subsequently according to the metal of the cable
The current signal at sheath both ends determines Leakage Current, and then determines the position of fault point.
In an embodiment of the present invention, the step 2 specifically comprises the following steps：
Step 21：Fast Fourier Transform (FFT) (FFT) is carried out to the current signal at the metal sheath both ends of the cable, is obtained
The original signal at the metal sheath both ends of cable, specific transformation for mula are as follows：
Wherein,For twiddle factor；X (n) is the finite length sequence that a length is N, i.e. current transformer is adopted
The original signal collected；X (k) is the finite length sequence of frequency domain N points.
Step 22：The amplitude for extracting the original signal DC component obtains letting out for the metal sheath both ends of the cable
Reveal electric current ILAnd IR。
After carrying out FFT transform decomposition to original signal, the amplitude of its DC component (generally at n=0) is can extract, respectively
Correspondence is denoted as ILAnd IR.Fast Fourier Transform (FFT) and direct current are carried out by the current signal at the metal sheath both ends to the cable
Component amplitude extraction process can remove the interference signals such as present collected noise so that testing result is more accurate.
After short trouble occurs for cable, manipulated untwisted cable circuit one end terminal fitting, using power supply, transformer and rectified current
Road adds DC voltage between cable core and metal sheath, as shown in figure 3, can be at cable run both ends using current transformer
Metallic shield grounding point detects leakage current, and equivalent circuit is as shown in Figure 4.Wherein, UDCFor Equivalent DC voltage source, RfFor electricity
Cable short circuit breakdown channel equivalent resistance, Rg1For the equivalent ground resistance in cable one end, Rg2For the equivalent ground resistance of the cable other end, R1
For fault point to the equivalent resistance of metal sheath one end, R2For fault point to the metal sheath equivalent resistance of the other end, USFor event
Barrier point metal sheath voltage.The leakage current I that both ends detectLAnd IRShown in formula (3) and (4).
If unit length metal sheath equivalent resistance is RS0, cable run overall length is L, position of failure point xf, then leak
Shown in the direct proportionate relationship of electric current such as formula (5)：
For a known cable run, cable run length L, unit length metal sheath equivalent resistance RS0It is normal
Number, the metal sheath two-terminal-grounding resistance R of cableg1And Rg2It can be obtained by test.Therefore, in the metal for detecting cable
Sheath both ends leakage current ILAnd IRAfterwards, pass through formula (5) ILAnd IRRatio can calculate fault point and cable and apply voltage position
Distance and position x between settingf, as shown in formula (6), you can determine position of failure point.
It can be according to the Leakage Current and phase at the metal sheath both ends for the cable that abovementioned steps obtain by above-mentioned formula
Known parameters are closed, fault point and cable is accurately calculated and applies at a distance between voltage location, consequently facilitating accurately really
Determine the fixed exact position of failure.
The offline distance measuring method of high voltage single-core cable short trouble of the present invention is logical according to high voltage single-core cable structure and failure
Road characteristic, by the alive method of failure phase cable, measuring the leakage current in cable metal sheath, and by leakage
The analysis of electric current carries out fault point ranging.Alive amplitude according to the present invention is not the traveling wave letter in " Low Voltage Impulse Method "
Number voltage magnitude, without that will bring the voltage up to, fault point is breakdown again, and this method carries under the premise of ensureing safety
High range accuracy, and it is suitable for high resistive fault and flashover failure.
The present invention also provides a kind of offline range unit of high voltage single-core cable short trouble, including DC power supply, two
Current transformer and processor；
The power supply, for adding direct current between the core of cable and the metal sheath of ground connection that short trouble occurs
Press signal；
Described two current transformers are correspondingly arranged between the both ends and ground of cable ends metal sheath in advance respectively, and
Current signal for the metal sheath both ends for acquiring cable；
Processor is used to correspond to the metal for determining cable respectively according to the current signal at the metal sheath both ends of the cable
The Leakage Current at sheath both ends, and position of failure point is calculated according to the Leakage Current at the metal sheath both ends of the cable.
The offline range unit of high voltage single-core cable short trouble of the present invention, it is alive to failure phase cable by power supply
Method, current transformer measures the leakage current in cable metal sheath, and is carried out to the analysis of leakage current by processor
Fault point ranging, it is breakdown again it is not necessary that fault point will be brought the voltage up to, under the premise of ensureing safety, improve ranging
Precision, and the fault point suitable for metallicity failure, high resistive fault and flashover failure is accurately positioned, to the exhausted of test cable
Edge resistance no requirement (NR).
As shown in Figure 3, it is preferable that on the basis of the above embodiments, the high voltage single-core cable short trouble is offline
Range unit further includes transformer and rectified current, and the power supply is AC power, the both ends of the power supply respectively with the change
The both ends of depressor primary coil correspond to electrical connection, the both ends of the secondary coil of the transformer respectively with the rectification circuit
Two input terminals correspond to electrical connection, and an output end of the rectification circuit is electrically connected with cable one end that short trouble occurs,
Another output end is grounded.As shown in figure 3, passing through power supply (generator or alternating current source may be used), transformer and rectified current
For stream between cable one end end line core and metal sheath plus DC voltage, current transformer collects current signal in real time, and by
Processor determines the Leakage Current at cable run both ends.
It is equipped with transformer by using AC power, voltage of the load between cable core and metal sheath can be adjusted
Size will be exchanged convenient for matching suitable voltage for the different suitable transformers of cable match selection by rectification circuit
Voltage signal is converted to d. c. voltage signal, in this way can be to avoid due to loading the friendship between cable core and metal sheath
It flows signal and generates electromagnetic induction, influence the detection accuracy of Leakage Current.
It is highly preferred that on the basis of the above embodiments, the transformer is adjustable transformer.By the way that adjustable transformation is arranged
Device can be directed to same cable and load different size of d. c. voltage signal, take multiple measurements, improve measurement accuracy, simultaneously
It is also possible that whole device is applicable in the fault detect of different cables, enhance its versatility.
In an embodiment of the present invention, the processor is distinguished according to the current signal at the metal sheath both ends of the cable
The Leakage Current at the corresponding metal sheath both ends for determining cable is implemented as：
Fast Fourier Transform (FFT) is carried out to the current signal at the metal sheath both ends of the cable, obtains the metal shield of cable
The original signal at layer both ends, specific transformation for mula are as follows：
Wherein,For twiddle factor；X (n) is the finite length sequence that a length is N, i.e. current transformer is adopted
The original signal collected；X (k) is the finite length sequence of frequency domain N points.
The amplitude for extracting the original signal DC component obtains the Leakage Current I at the metal sheath both ends of the cableL
And IR。
After carrying out FFT transform decomposition to original signal, the amplitude of its DC component (generally at n=0) is can extract, respectively
Correspondence is denoted as ILAnd IR.Fast Fourier Transform (FFT) and direct current are carried out by the current signal at the metal sheath both ends to the cable
Component amplitude extraction process can remove the interference signals such as present collected noise so that testing result is more accurate.
In an embodiment of the present invention, the processor is calculated according to the Leakage Current at the metal sheath both ends of the cable
The specific formula for calculation of position of failure point is：
Wherein, L is cable length, RS0It is constant, R for the unit length metal sheath equivalent resistance of cableg1And Rg2Point
Not Wei cable metal sheath two-terminal-grounding resistance, ILAnd IRThe respectively Leakage Current at the metal sheath both ends of cable, xfFor event
Barrier is put at a distance between cable application voltage location, and specific derivation process has been discussed in detail above, and which is not described herein again.
It can be according to the Leakage Current and phase at the metal sheath both ends for the cable that abovementioned steps obtain by above-mentioned formula
Known parameters are closed, fault point and cable is accurately calculated and applies at a distance between voltage location, consequently facilitating accurately really
Determine the fixed exact position of failure.
The present invention also provides a kind of offline range-measurement systems of high voltage single-core cable short trouble, it is characterised in that：Including nothing
Line communicating circuit, monitor terminal and at least one offline range unit of high voltage single-core cable short trouble, the processing
Device is electrically connected with the wireless communication line, and the wireless communication line is wirelessly connected with the monitor terminal.
The offline range-measurement system of high voltage single-core cable short trouble of the present invention, it is offline by high voltage single-core cable short trouble
Range unit measures position of failure point information, and is sent to monitor terminal via wireless communication line, is easy to implement remote monitoring,
It is simple and convenient, efficient quick.
In the present invention, PC machine, smart mobile phone, tablet computer or PDA etc., which may be used, in the monitor terminal has interaction work(
The terminal device of energy.GPRS communication module, bluetooth module or wifi module etc. may be used in the wireless communication line.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of offline distance measuring method of high voltage single-core cable short trouble, which is characterized in that include the following steps：
Step 1：D. c. voltage signal is added between the core of cable and the metal sheath of ground connection that short trouble occurs, and is divided
Not Cai Ji cable metal sheath both ends current signal；
Step 2：Correspond to the metal sheath both ends for determining cable respectively according to the current signal at the metal sheath both ends of the cable
Leakage Current；
Step 3：Position of failure point is calculated according to the Leakage Current at the metal sheath both ends of the cable.
2. the offline distance measuring method of high voltage single-core cable short trouble according to claim 1, which is characterized in that the step
In 1, by the way that pre-set current transformer detects the cable respectively between the both ends and ground of the metal sheath in cable
The current signal at metal sheath both ends.
3. the offline distance measuring method of high voltage single-core cable short trouble according to claim 1, which is characterized in that the step
2 specifically comprise the following steps：
Step 21：Fast Fourier Transform (FFT) is carried out to the current signal at the metal sheath both ends of the cable, obtains the gold of cable
Belong to the original signal at sheath both ends；
Step 22：The amplitude for extracting the original signal DC component obtains the leakage electricity at the metal sheath both ends of the cable
Flow ILAnd IR。
4. the offline distance measuring method of high voltage single-core cable short trouble according to claim 1, which is characterized in that the step
In 3, the calculation formula that the metal sheath both ends Leakage Current according to the cable calculates position of failure point is：
Wherein, L is cable length, RS0It is constant, R for the unit length metal sheath equivalent resistance of cableg1And Rg2Respectively
The metal sheath two-terminal-grounding resistance of cable, ILAnd IRThe respectively Leakage Current at the metal sheath both ends of cable, xfFor fault point
At a distance between cable application voltage location.
5. a kind of offline range unit of high voltage single-core cable short trouble, it is characterised in that：It is mutual including DC power supply, two electric currents
Sensor and processor；
The power supply, for believing plus DC voltage between the core of cable and the metal sheath of ground connection that short trouble occurs
Number；
Described two current transformers are correspondingly arranged between the both ends and ground of cable ends metal sheath in advance respectively, and are used for
Acquire the current signal at the metal sheath both ends of cable；
Processor is used to correspond to the metal sheath for determining cable respectively according to the current signal at the metal sheath both ends of the cable
The Leakage Current at both ends, and position of failure point is calculated according to the Leakage Current at the metal sheath both ends of the cable.
6. the offline range unit of high voltage single-core cable short trouble according to claim 5, it is characterised in that：Further include becoming
Depressor and rectified current, the power supply are AC power, the both ends of the power supply respectively with the transformer two
The both ends of the corresponding electrical connection in end, the secondary coil of the transformer are corresponding with two input terminals of the rectification circuit electric respectively
Connection, an output end of the rectification circuit are electrically connected with cable one end that short trouble occurs, another output end ground connection.
7. the offline range unit of high voltage single-core cable short trouble according to claim 6, it is characterised in that：The transformation
Device is adjustable transformer.
8. the offline range unit of high voltage single-core cable short trouble according to claim 5, it is characterised in that：The processing
Device corresponds to the leakage electricity at the metal sheath both ends for determining cable according to the current signal at the metal sheath both ends of the cable respectively
Stream is implemented as：
Fast Fourier Transform (FFT) is carried out to the current signal at the metal sheath both ends of the cable, obtains the metal sheath two of cable
The original signal at end；
The amplitude for extracting the original signal DC component obtains the Leakage Current I at the metal sheath both ends of the cableLAnd IR。
9. the offline range unit of high voltage single-core cable short trouble according to claim 5, it is characterised in that：The processing
Device according to the Leakage Current at the metal sheath both ends of the cable calculate position of failure point specific formula for calculation be：
Wherein, L is cable length, RS0It is constant, R for the unit length metal sheath equivalent resistance of cableg1And Rg2Respectively
The metal sheath two-terminal-grounding resistance of cable, ILAnd IRThe respectively Leakage Current at the metal sheath both ends of cable, xfFor fault point
At a distance between cable application voltage location.
10. a kind of offline range-measurement system of high voltage single-core cable short trouble, it is characterised in that：Including wireless communication line, monitoring
Terminal and the offline range unit of at least one claim 5-9 any one of them high voltage single-core cable short trouble, the place
Reason device is electrically connected with the wireless communication line, and the wireless communication line is wirelessly connected with the monitor terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810825654.6A CN108646144A (en) | 2018-07-25 | 2018-07-25 | A kind of offline distance measuring method of high voltage single-core cable short trouble, apparatus and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810825654.6A CN108646144A (en) | 2018-07-25 | 2018-07-25 | A kind of offline distance measuring method of high voltage single-core cable short trouble, apparatus and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108646144A true CN108646144A (en) | 2018-10-12 |
Family
ID=63760268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810825654.6A Pending CN108646144A (en) | 2018-07-25 | 2018-07-25 | A kind of offline distance measuring method of high voltage single-core cable short trouble, apparatus and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108646144A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157915A (en) * | 2019-12-31 | 2020-05-15 | 国网北京市电力公司 | Cable leakage current detection method and device, storage medium and processor |
| CN111856208A (en) * | 2020-07-17 | 2020-10-30 | 山东科汇电力自动化股份有限公司 | Ultrahigh-voltage cable sheath fault point positioning device and method |
| CN112045107A (en) * | 2020-08-13 | 2020-12-08 | 无锡市华美电缆有限公司 | Intelligent shearing mechanism for cable |
| CN113030649A (en) * | 2021-03-29 | 2021-06-25 | 国网上海市电力公司 | Intelligent cable fault automatic positioning method |
| CN113447767A (en) * | 2021-06-25 | 2021-09-28 | 北京英瑞来科技有限公司 | Method and system for positioning metal jacket fault of high-voltage power cable |
| CN114550993A (en) * | 2022-02-28 | 2022-05-27 | 国网江苏省电力有限公司无锡供电分公司 | Method and system for directly grounding two ends of single-phase sheath of high-voltage power cable |
| CN114639882A (en) * | 2022-03-07 | 2022-06-17 | 广州鹏辉能源科技股份有限公司 | Battery package thermal runaway protection system |
| CN116718875A (en) * | 2023-08-10 | 2023-09-08 | 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 |
| CN116953425A (en) * | 2023-07-03 | 2023-10-27 | 国网四川省电力公司成都供电公司 | Power transmission cable metal sheath grounding fault positioning method based on fixed frequency alternating current coupling |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101196550A (en) * | 2007-12-21 | 2008-06-11 | 赵瑞琳 | Power cable monitoring device and method for monitoring power cable state using the same |
| CN101782621A (en) * | 2010-03-23 | 2010-07-21 | 淄博威特电气有限公司 | Method and device for judging fault point locations in cable protective layer fault detection |
| CN103941161A (en) * | 2014-05-12 | 2014-07-23 | 国家电网公司 | On-line monitoring system for current and carrying capacity of cable sheath |
| CN105303927A (en) * | 2014-06-07 | 2016-02-03 | 国家电网公司 | Medium-voltage cable electrical test skill training system |
| CN106597197A (en) * | 2016-12-09 | 2017-04-26 | 国网江苏省电力公司苏州供电公司 | Method and apparatus for positioning short circuit of crossed and interconnected structure of high-voltage single-core cable |
| CN106771863A (en) * | 2016-12-09 | 2017-05-31 | 国网江苏省电力公司苏州供电公司 | The short trouble localization method of high-tension cable-trolley line mixed power transmission line |
| CN106940413A (en) * | 2017-05-11 | 2017-07-11 | 国网江苏省电力公司苏州供电公司 | The short trouble section determination methods and device of high pressure long cable circuit |
| CN106990327A (en) * | 2017-05-11 | 2017-07-28 | 国网江苏省电力公司苏州供电公司 | High voltage single-core cable short trouble point detecting method |
-
2018
- 2018-07-25 CN CN201810825654.6A patent/CN108646144A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101196550A (en) * | 2007-12-21 | 2008-06-11 | 赵瑞琳 | Power cable monitoring device and method for monitoring power cable state using the same |
| CN101782621A (en) * | 2010-03-23 | 2010-07-21 | 淄博威特电气有限公司 | Method and device for judging fault point locations in cable protective layer fault detection |
| CN103941161A (en) * | 2014-05-12 | 2014-07-23 | 国家电网公司 | On-line monitoring system for current and carrying capacity of cable sheath |
| CN105303927A (en) * | 2014-06-07 | 2016-02-03 | 国家电网公司 | Medium-voltage cable electrical test skill training system |
| CN106597197A (en) * | 2016-12-09 | 2017-04-26 | 国网江苏省电力公司苏州供电公司 | Method and apparatus for positioning short circuit of crossed and interconnected structure of high-voltage single-core cable |
| CN106771863A (en) * | 2016-12-09 | 2017-05-31 | 国网江苏省电力公司苏州供电公司 | The short trouble localization method of high-tension cable-trolley line mixed power transmission line |
| CN106940413A (en) * | 2017-05-11 | 2017-07-11 | 国网江苏省电力公司苏州供电公司 | The short trouble section determination methods and device of high pressure long cable circuit |
| CN106990327A (en) * | 2017-05-11 | 2017-07-28 | 国网江苏省电力公司苏州供电公司 | High voltage single-core cable short trouble point detecting method |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157915A (en) * | 2019-12-31 | 2020-05-15 | 国网北京市电力公司 | Cable leakage current detection method and device, storage medium and processor |
| CN111856208A (en) * | 2020-07-17 | 2020-10-30 | 山东科汇电力自动化股份有限公司 | Ultrahigh-voltage cable sheath fault point positioning device and method |
| CN111856208B (en) * | 2020-07-17 | 2023-09-19 | 山东科汇电力自动化股份有限公司 | Device and method for positioning fault point of ultra-high voltage cable sheath |
| CN112045107B (en) * | 2020-08-13 | 2022-11-01 | 无锡市华美电缆有限公司 | Intelligent shearing mechanism for cable |
| CN112045107A (en) * | 2020-08-13 | 2020-12-08 | 无锡市华美电缆有限公司 | Intelligent shearing mechanism for cable |
| CN113030649A (en) * | 2021-03-29 | 2021-06-25 | 国网上海市电力公司 | Intelligent cable fault automatic positioning method |
| CN113447767A (en) * | 2021-06-25 | 2021-09-28 | 北京英瑞来科技有限公司 | Method and system for positioning metal jacket fault of high-voltage power cable |
| CN114550993A (en) * | 2022-02-28 | 2022-05-27 | 国网江苏省电力有限公司无锡供电分公司 | Method and system for directly grounding two ends of single-phase sheath of high-voltage power cable |
| CN114639882A (en) * | 2022-03-07 | 2022-06-17 | 广州鹏辉能源科技股份有限公司 | Battery package thermal runaway protection system |
| CN114639882B (en) * | 2022-03-07 | 2024-04-16 | 广州鹏辉能源科技股份有限公司 | Battery Bao Re runaway protection system |
| CN116953425A (en) * | 2023-07-03 | 2023-10-27 | 国网四川省电力公司成都供电公司 | Power transmission cable metal sheath grounding fault positioning method based on fixed frequency alternating current coupling |
| CN116953425B (en) * | 2023-07-03 | 2024-02-09 | 国网四川省电力公司成都供电公司 | Power transmission cable metal sheath grounding fault positioning method based on fixed frequency alternating current coupling |
| CN116718875A (en) * | 2023-08-10 | 2023-09-08 | 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 |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108646144A (en) | A kind of offline distance measuring method of high voltage single-core cable short trouble, apparatus and system | |
| CN108181552B (en) | Underground cable fault detection system and fault detection method thereof | |
| CN108152596B (en) | A kind of electric force pole tower ground resistance measuring instrument and resistance measurement method | |
| CN108896872A (en) | Handheld cable fault detection system and method based on SSTDR | |
| CN102298104B (en) | A kind of method for detecting ground fault of bridge cable | |
| CN110346688A (en) | A kind of high pressure complexity cable fault quick segmentation differentiates and localization method | |
| CN102735994B (en) | A kind of input based on capacitance sensing non-contact signal or the method and apparatus detecting | |
| CN108548962A (en) | A kind of grounded screen alternating current and direct current and impulse resistance integrated test system and method | |
| CN105467192B (en) | A kind of method for measuring current conversion station ground potential and rising | |
| Heizmann et al. | On-site partial discharge measurements on premoulded cross-bonding joints of 170 kV XLPE and EPR cables | |
| CN109387733A (en) | A kind of distribution circuit single-phase earth fault localization method and system | |
| CN205539205U (en) | Measure transmission tower earth impedance's return circuit impedance test system | |
| Dong et al. | A diagnosis of grounding grid corrosion defects based on branch voltage disturbance | |
| CN103424627A (en) | Method for measuring zero-sequence impedance of parallel distribution network circuit at double ends | |
| CN203405561U (en) | Direct current power source grounding fault searching device | |
| Anane et al. | Non-contact measurement of traveling wave of overhead transmission line | |
| Liu et al. | A magnetic detecting and evaluation method of substation’s grounding grids with break and corrosion | |
| Lin et al. | Fault location for three-ended ring-topology power system using minimum GPS-based measurements and CVT/CT sensing | |
| CN103424628A (en) | Method for measuring parallel grid line positive sequence impedance | |
| Sarmiento et al. | Survey of low ground electrode impedance measurements | |
| CN206038784U (en) | Live line measurement zinc oxide arrester's wireless tester | |
| CN106841916B (en) | Distribution automation system earth fault positioning method based on traveling wave measure and transient zero-mode reactive power direction | |
| CN113820536A (en) | Zinc oxide arrester live-line detection method based on wireless synchronous current measurement technology | |
| CN114675128A (en) | Submarine cable insulation fault on-line positioning method based on sheath current and voltage | |
| CN210109246U (en) | Power cable intermediate head partial discharge detection system based on composite electric field |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181012 |