CN105807183B - A kind of power transmission line fault locating method based on noncontacting proximity sensor - Google Patents
A kind of power transmission line fault locating method based on noncontacting proximity sensor Download PDFInfo
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- CN105807183B CN105807183B CN201610141292.XA CN201610141292A CN105807183B CN 105807183 B CN105807183 B CN 105807183B CN 201610141292 A CN201610141292 A CN 201610141292A CN 105807183 B CN105807183 B CN 105807183B
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
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- 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
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Abstract
The invention proposes a kind of power transmission line fault locating methods based on noncontacting proximity sensor, comprising the following steps: S1, the detection device for being used to detect travelling wave signal every 10 ~ 15km installation one on the transmission line；Current and voltage signals in S2, reception circuit, and Master Control Center is transferred to by communication module；S3, Master Control Center carry out after analysis finds fault traveling wave signal the data received, find the second fault traveling wave signal in the connected detection device An of the corresponding detection device Am of the fault traveling wave signal, and according to fault traveling wave signal and the second fault traveling wave signal, the time that first wavefront arrives separately at detection device Am and An is calculated；S4, fault point position is calculated.Power transmission line fault locating method positioning accuracy of the invention is high, can be widely applied to high-voltage transmission network.
Description
Technical field
The invention belongs to technical field of electric system protection, in particular to a kind of power transmission line based on noncontacting proximity sensor
Road Fault Locating Method.
Background technique
The position of failure point for quickly and accurately determining transmission line of electricity, can accelerate the reparation of permanent fault, remove a hidden danger in time
To avoid the generation again of a large amount of transient faults, have to the safety and stability and economical operation that guarantee electric system highly important
Meaning.
Currently, the fault location of transmission line of electricity, has been proposed a variety of methods both at home and abroad, mainly there are impedance method, S injection
Method, " fault detector " technology, FEEDER AUTOMATION and traveling wave method.Impedance method is by line impedance, load and power parameter
It is affected, for having the distribution line of multiple-limb, impedance method cannot exclude pseudo-fault point.The Injection Signal of S injection method
Finite energy, if fault point is far through very big resistance eutral grounding or fault point distance route beginning, signal will be very faint
It can not accurately measure.Although " fault detector " technology has obtained functionization, but the using effect of earth-fault indicator is then not
Highly desirable, accuracy is not high, and power grid occurs usually not react when singlephase earth fault.FEEDER AUTOMATION can not accurately
Failure is positioned, and the section of fault location is influenced by feeder automation equipment packing density.
Currently, domestic and foreign scholars have conducted extensive research 110kV and its above ultra-high-tension power transmission line fault-location problem,
And practicability progress is had been achieved with, when carrying out fault location using both-end travelling wave signal, the measurement of wavefront be can be used not
Same implementation method.Typical method is directly to carry out wave head detection using the secondary singal of current transformer.It is applied to electricity at present
The range unit of the comparative maturity of Force system, WFL2010, Xi'an Communications University and the mountain researched and developed such as China Electric Power Research Institute
The XC-11 etc. of the eastern electrical limited liability company's research and development of Memec.These traveling wave positioning devices mainly have using current transformer
Good progress of disease high-frequency signal ability, still, using current traveling wave signal carry out fault location when, the acquisition of current traveling wave
Signal is larger by corona interference, when carrying out wavelet analysis to data, it sometimes appear that wave head bad timing, causes positioning stablity
Property, reliability and the not high engineering adaptability of accuracy are relatively poor.And when corollary failure is insulated in non-lightning stroke, usually easily occur
Voltage peaks, voltage traveling wave is compared with current traveling wave high sensitivity.In addition, existing traveling wave ranging device is since sample rate is lower,
It is no more than 1MHz mostly, positioning accuracy is relatively low, and theoretical and practical range error is often beyond 1km.
Summary of the invention
The present invention overcomes the shortcomings of the prior art, and technical problem to be solved is to provide one kind based on contactless
The power transmission line fault locating method of sensor.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows: a kind of based on noncontacting proximity sensor
Power transmission line fault locating method, comprising the following steps: S1, every 10~15km install one for detecting on the transmission line
The detection device of travelling wave signal, is respectively labeled as A1, A2 ... Am, An ... At, and each detection device includes three contactless biographies
Sensor, sampling system, A/D conversion module, communication module, three noncontacting proximity sensors are separately mounted on transmission line of electricity
Each phase near；S2, three noncontacting proximity sensors receive the current and voltage signals in circuit, non-connect with described three
The connected sampling system of touch sensor carries out sample record to current and voltage signals, and is carried out by A/D conversion module
After processing, Master Control Center is transferred data to by the communication module；S3, Master Control Center carry out analysis hair to the data received
After existing fault traveling wave signal, find detection device Am corresponding with the fault traveling wave signal, and with the detection device Am
Corresponding second fault traveling wave signal of connected detection device An, and according to the fault traveling wave signal and second failed row
The time that first wavefront arrives separately at detection device Am and An is calculated in wave signal；S4, according to first traveling wave wave
Head reaches the time of detection device Am and An；The distance of fault point difference distance detection device An and Am is calculated, and according to detection
The specific location of device An and Am, calculate fault point position.
The detection device is mounted on the steel tower of transmission line of electricity, and three noncontacting proximity sensors are separately mounted to defeated
Near each phase of electric line, the response frequency of three noncontacting proximity sensors is greater than 10MHz.
Three noncontacting proximity sensors include electric-field sensor and magnetic field sensor, and the electric-field sensor is for surveying
The voltage of circuit is measured, the magnetic field sensor is used for the electric current of measuring circuit, the electric-field sensor and the magnetic field sensor
It is not connect with test line.
The sample frequency of the sampling system is 10MHz.
When the communication module transfers data to Master Control Center, if not finding fault traveling wave signal, the communication mould
Block carries out part to sampled data and extracts transmission；If Master Control Center issues detailed data upload request it was found that fault traveling wave signal,
After communication module receives detailed data upload request, whole uploads are carried out to the detailed sampled data of fault traveling wave signal.
The detection device further includes GPS positioning module, for carrying out clock alignment to detection device.
It is adopted compared with the prior art, the invention has the following beneficial effects: carrying out travelling wave signal using noncontacting proximity sensor
Collection, change are currently limited in practical substation Current Voltage sensor acquisition mode and carry out fault location, and detection device can be with
It is mounted on the steel tower of transmission line of electricity, can simplify installation difficulty；It, can be with by the high-speed response frequency of noncontacting proximity sensor
The sample frequency for improving detection device, further improves the reliability and accuracy of data, to further improve both-end
The positioning accuracy of traveling wave；Using the high speed output of 10MHz, and not only mentioned using the communication mode of data pick-up when communicating
High data precision, and amount of communication data is reduced, improve communication efficiency；Fault Locating Method of the invention can be realized height
The calibration of the abort situation of quality, fault location Precision Theory error reach within 100 meters, and field failure precision controlling is 200
Within rice.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the non-contact device sensor internal that the embodiment of the present invention uses
Fig. 2 is the schematic diagram of data pick-up communication and necessary detailed data communication in the embodiment of the present invention.
Specific embodiment
The present invention will be further described in detail in the following with reference to the drawings and specific embodiments.
The invention proposes a kind of power transmission line fault locating methods based on noncontacting proximity sensor, including following step
It is rapid:
S1, the detection device for being used to detect travelling wave signal every 10~15km installation one on the transmission line, to each
Detection device is numbered, and is respectively labeled as A1, A2 ... Am, An ... At.
Each detection device used by power transmission line fault locating method based on noncontacting proximity sensor of the invention
Including sensor module, sampling system, A/D conversion module, communication module, wherein sensor module includes 3 contactless biographies
Sensor is separately mounted in each phase of transmission line of electricity, and sampling system is connected with sensor module, for acquiring sensor module
In current and voltage signals, A/D conversion module is connected with sampling system, the signal output end of communication module and A/D conversion module
It is connected, the output signal of A/D conversion module can be sent to by communication module by way of mobile telephone network or satellite phone
Master Control Center
S2, the current and voltage signals in circuit are received by the sensor module in detection device, with sensor module phase
The current and voltage signals that sampling system even receives sensor carry out sample record, and by A/D conversion module at
It is transferred to communication module after reason, is transferred to Master Control Center by way of mobile telephone network or satellite phone by communication module.
S3, Master Control Center analyze current and voltage signals, once discovery fault traveling wave signal, Master Control Center just start
Search is found the fault traveling wave signal in the connected detection device An of the corresponding detection device Am of the fault traveling wave signal, and is led to
Cross the time tn that time tm and arrival detection device An that first wavefront arrives separately at detection device Am is calculated.
Wherein, when Master Control Center carries out calculation processing to fault traveling wave signal, in order to correctly measure traveling wave arrival time,
Level cannot simply be detected, it is also necessary to calculate to waveform rising point.It is handled using advanced software technology, so that failure
Waveform shape has little effect for resulting in, i.e., by fault traveling wave signal fixed clutter and traveling wave counted respectively
Calculate, be calculated by way of dispersion calculation first wavefront reach the time tm of detection device Am and reach An when
Between tn, for the method compared with simple differential calculation, influence of the frequency content of fixed clutter to calculation is relatively small.
S4, the time tm of detection device Am is reached according to first wavefront and reaches the time tn of detection device An；
The distance of fault point distance detection device Am and An is calculated, and according to the specific location of detection device Am and An, calculating is out of order
Locate position.
For faulty line, if transmission line of electricity overall length L (i.e. the distance of detection device Am and An), fault point is initial
Traveling wave reach time of detection device Am and An if it is known that if fault point device for detecting distance Am and An distance difference
Are as follows:
V is traveling wave speed in formula, due to zero line wave of transmission line of electricity there are attenuations big, parameter with frequency change greatly, velocity of wave
The problems such as unstable, does not use zero mould travelling wave ranging generally.The velocity of wave of line line wave can use route parameter calculation and actual measurement.
Consider the frequencfy-dependent behavior of line parameter circuit value, traveling wave speed calculation formula is as follows:
In formula: R, L, G, C be respectively the resistance of route unit length, inductance, conductance and capacitance parameter frequency characteristic, closely
Seemingly think that transmission line of electricity is uniform lossless long line, can simplify as the following formula and calculate line mould traveling wave speed:
In formula: Lma, Cma, Lmb, CmbThe respectively modulus inductance and capacitor of transmission line of electricity unit length.
Wherein, sensor module includes 3 noncontacting proximity sensors, as shown in Figure 1, for non-contact device sensor internal
Structural schematic diagram is made of electric-field sensor and magnetic field sensor two parts inside the noncontacting proximity sensor, two is passed by this
Sensor can detect the voltage and current signals of electrical body spaced apart.Testing principle are as follows: magnetic field sensor is in line
Loop-shaped can detecte out and flow through magnetic field caused by electric current in electrical body.Electric-field sensor can detecte voltage on electric body and produce
Raw electric field.Sensor cover can believe the voltage and current generated in electrical body with spaced apart to electrical body and when being arranged
It number is detected.This sensor has very good response characteristic for power frequency wave and high frequency waves, will by high performance cable
Signal is transferred to detection device, correctly tracer signal waveform.Due to not being connected directly with transmission line of electricity, which can
To be mounted on steel tower, change is currently limited to Current Voltage sensor acquisition mode in practical substation and carries out fault location.
In addition, the response frequency of the noncontacting proximity sensor can achieve 10MHz or more, thus, it is possible to obtain the failure of degree of precision
Travelling wave signal, so as to obtain accurate traveling wave arrival time, to realize accurate fault location.
Wherein, the representative value of the sample frequency of sampling system can be 10MHz.
Further, since the obtained Wave data of high-speed sampling, data volume is larger, and the present invention is excellent using necessary data part
First transmitting function reduces amount of communication data and transmission time, to reach efficient data communication, as shown in Fig. 2, sample waveform
Data point it is more, when fault-free travelling wave signal, communication module only to sampled data carry out part transmission, that is, take data to take out
The mode taken is communicated, once Master Control Center finds fault traveling wave signal, Master Control Center proposes detailed calculation data
Upload request after communication module receives the request, i.e., carries out whole uploads to the detailed sampled data of travelling wave signal, in master control
The heart calculates traveling wave arrival time further according to the data.
In addition, detection device can also include GPS positioning module, for carrying out clock alignment, clock to detection device
Calibration accuracy can achieve 10-7.
The present invention provides a kind of power transmission line fault locating methods based on noncontacting proximity sensor, by contactless
Sensor carries out travelling wave signal acquisition, and change is currently limited to Current Voltage sensor acquisition mode in practical substation and carries out event
Barrier positioning, may be mounted on the steel tower of transmission line of electricity, simplify installation difficulty, mounting distance can be 5~50km, preferred to pacify
Dress distance is 10-15km, so as to improve the positioning accuracy of both-end traveling wave；In addition, the high speed for passing through noncontacting proximity sensor
The sample frequency of detection device can be improved in response frequency, the reliability and accuracy of data is further improved, thus into one
Step improves the positioning accuracy of both-end traveling wave；When Master Control Center carries out fault traveling wave signal calculating analysis, by fault traveling wave signal
In fixed clutter and traveling wave calculated separately, first wavefront is calculated by way of dispersion calculation and reaches inspection
The time of device is surveyed, to keep influence of the frequency content of fixed clutter to calculation relatively small, improves the essence of time detection
Degree；Moreover, the high-precision GPS locating module used carries out positioning and clock alignment to detection module, time essence can also be improved
Degree, therefore Fault Locating Method of the invention is used, fault location Precision Theory error can achieve within 100 meters, scene event
Barrier precision can control within 200 meters, can be widely applied to high-voltage fence power transmission network.
The embodiment of the present invention is explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Example, within the knowledge of a person skilled in the art, can also make without departing from the purpose of the present invention
Various change out.
Claims (6)
1. a kind of power transmission line fault locating method based on noncontacting proximity sensor, it is characterised in that: the following steps are included:
S1, the detection device for being used to detect travelling wave signal every 10 ~ 15km installation one on the transmission line, are respectively labeled as
A1, A2 ... Am, An ... At, each detection device include three noncontacting proximity sensors, sampling system, and A/D conversion module leads to
Believe module, three noncontacting proximity sensors are separately mounted near each phase on transmission line of electricity；
S2, three noncontacting proximity sensors receive the current and voltage signals in transmission line of electricity, contactless with described three
The connected sampling system of sensor carries out sample record to current and voltage signals, and is handled by A/D conversion module
Afterwards, Master Control Center is transferred data to by the communication module；
S3, Master Control Center carry out the data received to find the fault traveling wave signal pair after analysis finds fault traveling wave signal
The detection device Am answered, and the second fault traveling wave signal corresponding with the adjacent detection device An of the detection device Am, and
According to the fault traveling wave signal and second fault traveling wave signal, first wavefront is calculated and arrives separately at detection
The time of device Am and detection device An；
S4, the time that detection device Am and detection device An are arrived separately at according to first wavefront calculate fault point distance
The distance of detection device An and Am, and according to the specific location of detection device An and Am, calculate fault point position.
2. a kind of power transmission line fault locating method based on noncontacting proximity sensor according to claim 1, feature
It is, the detection device is mounted on the steel tower of transmission line of electricity, and three noncontacting proximity sensors are separately mounted to transmit electricity
Near each phase of route, the response frequency of three noncontacting proximity sensors is greater than 10MHz.
3. a kind of power transmission line fault locating method based on noncontacting proximity sensor according to claim 1, feature
It is, three noncontacting proximity sensors include electric-field sensor and magnetic field sensor, and the electric-field sensor is for measuring
The voltage of circuit, the magnetic field sensor are used for the electric current of measuring circuit, and the electric-field sensor and the magnetic field sensor are equal
It is not connect with test line.
4. a kind of power transmission line fault locating method based on noncontacting proximity sensor according to claim 1, feature
It is, the sample frequency of the sampling system is 10MHz.
5. a kind of power transmission line fault locating method based on noncontacting proximity sensor according to claim 1, feature
It is, it is described logical if Master Control Center does not find fault traveling wave signal when the communication module transfers data to Master Control Center
Believe that module carries out part to sampled data and extracts transmission；If it was found that fault traveling wave signal, Master Control Center issues detailed data and uploads
Request after communication module receives detailed data upload request, carries out in whole the detailed sampled data of fault traveling wave signal
It passes.
6. a kind of power transmission line fault locating method based on noncontacting proximity sensor according to claim 1, feature
It is, the detection device further includes GPS positioning module, for carrying out clock alignment to detection device.
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| CN109085473B (en) * | 2018-08-24 | 2019-08-13 | 海南电网有限责任公司电力科学研究院 | A kind of identification of transmission line of electricity high-frequency discharge and localization method |
| CN109212378A (en) * | 2018-09-29 | 2019-01-15 | 北京中恒博瑞数字电力科技有限公司 | Middle and low voltage network Fault Locating Method |
| CN110109041B (en) * | 2019-06-03 | 2020-12-22 | 南方电网科学研究院有限责任公司 | Detection system and method of non-contact traveling wave distance measuring device |
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| CN113030635A (en) * | 2021-02-07 | 2021-06-25 | 广州长川科技有限公司 | Non-contact type traveling wave fault location method and device |
| CN112904155B (en) * | 2021-05-07 | 2024-02-02 | 武汉品迅科技有限公司 | Multi-branch dominant network fault pole tower stage positioning method |
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