CN102103179A - Distance-measuring and positioning method and device for failure of power transmission line - Google Patents
Distance-measuring and positioning method and device for failure of power transmission line Download PDFInfo
- Publication number
- CN102103179A CN102103179A CN2009101146480A CN200910114648A CN102103179A CN 102103179 A CN102103179 A CN 102103179A CN 2009101146480 A CN2009101146480 A CN 2009101146480A CN 200910114648 A CN200910114648 A CN 200910114648A CN 102103179 A CN102103179 A CN 102103179A
- Authority
- CN
- China
- Prior art keywords
- current
- distance
- failure
- voltage
- measuring
- 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
Images
Classifications
-
- 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
- Locating Faults (AREA)
Abstract
The invention relates to a distance-measuring and positioning method and device for the failure of a power transmission line, and belongs to the field of power systems. A plurality of low-power current generators are combined to form a high-voltage direct current generator; through the reasonable provision of parameters, a high enough voltage can be produced to break down a failure point again, and high enough current can be output to maintain a stable failure state, so as to create a condition for the ranging, the tracking and the positioning of the failure. AC (Alternating Current) components with a special frequency are superposed on a high voltage DC (Direct Current); the reactance value of a failure loop is directly measured and calculated at the frequency; and the reactance value is multiplied by a proportional constant to obtain the distance from a signal injection point to a failure point. The distance-measuring and positioning method is simple and convenient to operate, and has high measurement accuracy; the distance-measuring and positioning device has the advantages of small total capacity and easy realization and production, and is significant for shortening the failure eliminating time and improving the power supply quality of a power grid.
Description
Technical field
The invention belongs to field of power, particularly a kind of measuring distance of transmission line fault localization method and device.
Background technology
6 kilovolts to the 66 kilovolts transmission lines of electricity of China are usually with pole line or power cable, and transmission line malfunction all is by the intermittence arc grounding usually, develops into the arc grounding of continous-stable, becomes continuous earth at last.The fault progression process can be several seconds, may be several hrs also, is difficult to determine in advance.For avoiding fault to enlarge, can the back take place in fault stop power supply in very short time usually, search the trouble spot, change trouble unit, restore electricity after fixing a breakdown.After the grid power blackout, the arc grounding fault also disappears immediately, searches trouble location and becomes difficult and time-consuming, so, after grid power blackout, calculate the distance of trouble spot and carry out the fault trace location, to shortening troubleshooting time, improve grid supply quality, significant.
The method that Chinese patent CN2650145Y has proposed a kind of " the direct current open circuit exchanges and seeks track ", faulty line utilizes high-voltage D.C. generator that the trouble spot is punctured again after having a power failure, and the AC signal of reinjecting is sought track with detector road along the line, up to finding the trouble spot.This method has many advantages, but the deficiency of following two aspects is also arranged: 1. this method does not have the fault distance computing function, searches fault by artificial line walking, time is longer, 2. designs high-voltage D.C. generator according to a conventional method, and power capacity is too big, cost is too high, and technical also being difficult to realizes.With 10 KVs is example, and breakdown fault point needs 14000 volts of high pressure usually again, and keeping malfunction needs electric current more than 5 amperes, and according to the conventional method design, the high-voltage D.C. generator capacity will reach 70 kilowatts.To 35 kilovolts and 66 kilovolts of electric power systems, the high-voltage D.C. generator power capacity will be bigger, more be difficult to apply.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, propose a kind ofly under the situation that faulty line has a power failure, can calculate the distance of trouble spot and carry out the new method of fault trace location.
A kind of measuring distance of transmission line fault localization method and device, by the high voltage direct current flow-generator, fault distance measuring and calculating unit, detection is sought the track unit and is formed, when system break down stop power supply after, inject high-voltage direct current mutually and between the ground in fault, the breakdown fault point creates conditions for finding range and seeking track again, it is characterized in that: with the miniwatt DC current generator that (comprises 2) more than 2, be combined into a high-voltage direct-current current feedback circuit, the parameter of each small power electric flow-generator of reasonable disposition, the output HIGH voltage that has, but output current is less, the big electric current of the output that has, but output voltage is lower, has both satisfied request for utilization, significantly reduce the total volume of device again, array mode has multiple choices, can be parallel way, series system also can adopt string and hybrid mode.
Causing arc fault needs very high voltage usually, and after the arc fault generation, keeps stable arc grounding state, need the electric current more than 5 amperes, and the correspondent voltage value is very low.According to these characteristics of arc fault, high-voltage D.C. generator can be divided into the small power electric flow-generator that (contains 2) more than two, the performance of these small power electric flow-generators has nothing in common with each other: what have is used to produce high voltage, but output current is less; What have is used to produce big electric current, but output voltage is lower, a plurality of small power electric flow-generators like this link together by certain mode, very high voltage can be arranged, again breakdown fault point, again bigger electric current can be arranged, keep stable arc grounding state, for trouble spot range finding and trouble spot seeking track Positioning Creates condition.Be example with 10 KVs still, can design two small power electric flow-generators, the basic index of a small power electric flow-generator is designed to: 14000 volts of voltages, and 100 milliamperes in electric current, capacity are 1.4 kilowatts; The basic index of another small power electric flow-generator is set at: 500 volts of voltages, electric current 5 peaces, capacity is 2.5 kilowatts, two small power electric flow-generators are in parallel or be cascaded, satisfy the condition of keeping arc fault, total volume has only 3.9 kilowatts, than much smaller with single high-voltage D.C. generator capacity, and easier realization on the engineering.Can certainly design three small power electric flow-generators, the index Design of first small power electric flow-generator is: 14000 volts of voltages, and 10 milliamperes in electric current, capacity are 140 watts; The index Design of second small power electric flow-generator is: 3000 volts of voltages, and 100 milliamperes in electric current, capacity are 300 watts; The index Design of the 3rd small power electric flow-generator is: 500 volts of voltages, and electric current 5 peaces, capacity is 2.5 kilowatts; Total volume is 2.9 kilowatts.The small power electric flow-generator of design is many more, and the target setting of each small power electric flow-generator is just thin more, and shortcoming is to cause circuit design to become complicated.
The generation of high-voltage direct current, usually earlier with transformer will be lower alternating voltage raise, with diode rectifier circuit interchange is become direct current then.As long as parameter is suitable, the rectification circuit of a plurality of electric pressures can directly (perhaps be made isolated component with diode) and be connected in parallel, and also can directly be cascaded.
For the distance of calculating the trouble spot with carry out fault and seek the track location, also need the AC compounent of a characteristic frequency of stack on high-voltage direct current, by measuring and surveying this AC compounent, finish trouble spot distance calculation and fault and seek the track location.
By the voltage current waveform of arc grounding as can be known, after the trouble spot forms stable arc grounding, its transition impedance value is very little, the imaginary part of its little change complex equivalent impedance is zero, also promptly, for the interchange of stack, in fault loop, have only faulty line itself to comprise reactive component, the trouble spot equivalent reactance is zero.It is as follows to draw fault distance-finding method thus:
The AC compounent of stack characteristic frequency on high-voltage direct current, at the signal injection side, detect the voltage and current of this AC signal, calculate the imaginary part of fault loop complex impedance under this frequency, be reactance value, this reactance is on duty in a proportionality constant, promptly gets the signal decanting point to the distance between the trouble spot, when adopting a plurality of miniwatt DC current generators to make up, the AC compounent of the characteristic frequency that can on any one or more miniwatt DC current generators, superpose.
Utilizing the AC signal of stack to carry out fault, to seek the technology of track location very ripe, is not repeated herein.
Electric current for the output of control high voltage direct current flow-generator; usually use Current Control Technology; at this moment; as long as any one link in current control loop; particularly on the given DC quantity of electric current, the AC compounent of a characteristic frequency of stack is in the actual high-voltage DC current of output; the alternating current component that just includes this characteristic frequency does not need the circuit of extra generation alternating current.
Apparatus of the present invention are normally used in the power station, and dead line can be to not measuring the bigger interference of generation for other, and for reducing to disturb, the frequency of stack AC signal should be avoided the first-harmonic and the harmonic frequency of electrical network.The current measurement path filter should be selected identical structure and parameter for use with the voltage measurement path filter, be the issuable skew of correcting filter characteristic, can adopt the real-time calibration technology: impedor sets up standard in measurement mechanism, in measurement clearance, the AC signal of characteristic frequency is connected to the normal impedance device, current measurement passage and voltage measurement passage are carried out amplitude and phase place demarcation.The normal impedance device can be measuring resistance, inductance, electric capacity, or three's combination, but the selection standard resistance stability can be better, and cost is also lower.
Characteristics of the present invention and technique effect
The present invention has two distinguishing features: 1. with a plurality of small power electric flow-generators, be combined into a high-voltage direct-current current feedback circuit,, both satisfied request for utilization by the parameter of each small power electric flow-generator of reasonable disposition, significantly reduced the total volume of device again, realized easily and make; 2. on high voltage direct current, the AC compounent of stack characteristic frequency, under this frequency, directly calculate the reactance value of fault loop, this reactance is on duty in a proportionality constant, promptly get the distance of signal decanting point to the trouble spot, simple, the measuring accuracy height is to shortening troubleshooting time, improve grid supply quality, significant.
Description of drawings
Fig. 1 is the structural representation of apparatus of the present invention embodiment 1.
Fig. 2 is the structural representation of apparatus of the present invention embodiment 2.
Embodiment
Fig. 1 is the structural representation of apparatus of the present invention embodiment 1, adopt two miniwatt DC current generators to be in series, wherein the output maximum a.c. voltage peak value of transformer T1 is set at 14000 volts, maximum output current is set at 100 milliamperes, through bridge rectifier circuit, can produce 14000 volts of DC voltage.The output maximum a.c. voltage peak value of transformer T2 is set at 500 volts, and maximum output current is set at 5 peaces, through bridge rectifier circuit, can produce 500 volts of DC voltage.After two miniwatt DC current generator series connection, maximum voltage reaches 14500 volts, and maximum output current still is 5 peaces, is enough to again breakdown fault point and keeps stable malfunction.Two miniwatt DC current generators are by the control of control arithmetic unit, and two bridge rectifier circuits are all pressed 5 peace current design.Voltage measurement passage and current measurement passage are used to measure the voltage and current of stack AC signal, calculate fault distance by the control arithmetic unit, and are shown by display.The real-time calibration function realizes that by measuring resistance and switch in the fault localization gap, switch is connected to measuring resistance with set specific frequency signal, is used for nominal voltage and measures passage and current measurement passage.
Fig. 2 is the structural representation of apparatus of the present invention embodiment 2, adopts two miniwatt DC current generators to be formed in parallel, and the design objective of transformer T1 and T2 and embodiment's 1 is identical.After the parallel connection of two miniwatt DC current generators, maximum voltage reaches 14000 volts, and maximum output current is 5.1 peaces, is enough to again breakdown fault point and keeps stable malfunction.For simplifying the design of the bridge rectifier circuit that links to each other with T2, increased a diode D1 as isolated component, and selected withstand voltage parameter by 14000 volts of voltages.Other functions are identical with embodiment's 1, are not repeated.
Because the voltage of high voltage direct current flow-generator output is very high, single commutation diode is difficult to bear so high voltage, and drawn diode among the embodiment is actually by a plurality of diodes and is in series.
Claims (4)
1. measuring distance of transmission line fault localization method and device, by the high voltage direct current flow-generator, fault distance measuring and calculating unit, detection is sought the track unit and is formed, when system break down stop power supply after, inject high-voltage direct current mutually and between the ground in fault, again breakdown fault point, create conditions for finding range and seeking track, it is characterized in that: with the miniwatt DC current generator that (comprises 2) more than 2, be combined into a high-voltage direct-current current feedback circuit, array mode can be parallel way, series system, also can adopt string and hybrid mode.
2. measuring distance of transmission line fault localization method according to claim 1 and device, it is characterized in that: the AC compounent of stack characteristic frequency on high-voltage direct current, at the signal injection side, detect the voltage and current of this AC signal, calculate the imaginary part of fault loop complex impedance under this frequency, be reactance value, this reactance is on duty in a proportionality constant, promptly get the signal decanting point to the distance between the trouble spot, the AC compounent of the characteristic frequency that can on any one or more miniwatt DC current generators, superpose.
3. measuring distance of transmission line fault localization method according to claim 2 and device, it is characterized in that: any one link in current control loop, particularly on the given DC quantity of electric current, the AC compounent of a characteristic frequency of stack does not need the circuit of extra generation alternating current.
4. according to claim 2 or 3 described measuring distance of transmission line fault localization method and devices, it is characterized in that: impedor sets up standard in measurement mechanism, in measurement clearance, the AC signal of characteristic frequency is connected to the normal impedance device, current measurement passage and voltage measurement passage are carried out amplitude and phase place demarcation, the normal impedance device can be measuring resistance, inductance, electric capacity, or three's combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101146480A CN102103179A (en) | 2009-12-21 | 2009-12-21 | Distance-measuring and positioning method and device for failure of power transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101146480A CN102103179A (en) | 2009-12-21 | 2009-12-21 | Distance-measuring and positioning method and device for failure of power transmission line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102103179A true CN102103179A (en) | 2011-06-22 |
Family
ID=44156103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101146480A Pending CN102103179A (en) | 2009-12-21 | 2009-12-21 | Distance-measuring and positioning method and device for failure of power transmission line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102103179A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102508121A (en) * | 2011-11-08 | 2012-06-20 | 西安交通大学 | Direct-current line single-terminal fault location method for multiterminal flexible direct-current transmission system |
| CN103364180A (en) * | 2012-03-27 | 2013-10-23 | 通用电气公司 | Systems and methods of identifying types of faults |
| CN104204824A (en) * | 2011-11-28 | 2014-12-10 | 诺丁汉大学 | Fault location in power distribution systems |
| CN108287295A (en) * | 2018-01-29 | 2018-07-17 | 山东钢铁股份有限公司 | Power circuit earth fault location lookup method and system |
| CN110244192A (en) * | 2019-07-25 | 2019-09-17 | 淄博威特电气有限公司 | A kind of power overhead network earth fault distance measurement method |
| CN110412427A (en) * | 2019-08-21 | 2019-11-05 | 成都信息工程大学 | A kind of low-voltage power fault detection positioning system and fault detection method |
-
2009
- 2009-12-21 CN CN2009101146480A patent/CN102103179A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102508121A (en) * | 2011-11-08 | 2012-06-20 | 西安交通大学 | Direct-current line single-terminal fault location method for multiterminal flexible direct-current transmission system |
| CN102508121B (en) * | 2011-11-08 | 2015-03-04 | 西安交通大学 | Direct-current line single-terminal fault location method for multiterminal flexible direct-current transmission system |
| CN104204824A (en) * | 2011-11-28 | 2014-12-10 | 诺丁汉大学 | Fault location in power distribution systems |
| US10352984B2 (en) | 2011-11-28 | 2019-07-16 | The University Of Nottingham | Fault location in power distribution systems |
| CN103364180A (en) * | 2012-03-27 | 2013-10-23 | 通用电气公司 | Systems and methods of identifying types of faults |
| CN108287295A (en) * | 2018-01-29 | 2018-07-17 | 山东钢铁股份有限公司 | Power circuit earth fault location lookup method and system |
| CN108287295B (en) * | 2018-01-29 | 2024-01-30 | 山东钢铁股份有限公司 | Power line ground fault position finding method and system |
| CN110244192A (en) * | 2019-07-25 | 2019-09-17 | 淄博威特电气有限公司 | A kind of power overhead network earth fault distance measurement method |
| CN110412427A (en) * | 2019-08-21 | 2019-11-05 | 成都信息工程大学 | A kind of low-voltage power fault detection positioning system and fault detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101382577B (en) | Single-phase earth fault positioning device for electrical power distribution network | |
| CN106443358B (en) | Overhead power distribution network traveling wave positioning system based on signal injection device | |
| CN102662104B (en) | Zero-crossing detection method and circuit | |
| CN102103179A (en) | Distance-measuring and positioning method and device for failure of power transmission line | |
| CN101499716B (en) | Single phase power factor correcting analog circuit without need of detecting DC output voltage | |
| CN107918079B (en) | Power distribution network single-phase earth fault positioning method and system based on sweep frequency injection | |
| CN203688720U (en) | Fault detection system for DC transmission grounding electrode circuits | |
| CN102096019A (en) | Method and device for locating single-phase grounding fault of low-current grounding system | |
| CN201765290U (en) | Single-phase grounding fault location device of cable and overhead line hybrid system | |
| CN207021912U (en) | Multiple-channel output random waveform voltage source system | |
| CN103166489B (en) | A kind of control circuit of Three-Phase SVPWM Rectifier | |
| CN102749542B (en) | Power quality monitoring device based on double-velocity double-range sampling | |
| CN104198798A (en) | Method for measuring resonance of fault capacitive current of petersen coil device | |
| CN108196162A (en) | The DC distribution net monopolar grounding fault wireline inspection method of model and parameters identification | |
| CN203178354U (en) | Three-phase AC electronic quantities detection circuit suitable for one-chip microcomputer | |
| CN103036285A (en) | Super capacitor charging circuit | |
| CN204086454U (en) | A kind of distribution line fault location system | |
| CN108957307A (en) | A kind of direct current change-over switch parameter of oscillation measurement method based on many reference amounts | |
| CN201397372Y (en) | Single-phase earthing fault locating device for electric distribution network | |
| CN102427248B (en) | Direct-driven wind power synchronization control method based on Buck-Boost matrix converter | |
| CN106546895B (en) | Diode surge performance test circuit and control method thereof | |
| CN104917458B (en) | A kind of method and its circuit of sensorless detection output current | |
| CN105223470B (en) | A kind of Distribution Network Failure localization method based on failure high-frequency information | |
| CN203151389U (en) | Control circuit of three-phase high power factor rectifier | |
| CN203658471U (en) | Power frequency interference suppressing device for testing ground resistance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: Huang Hongquan Document name: Notification that Application Deemed to be Withdrawn |
|
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110622 |