CN107918079A - A kind of one-phase earthing failure in electric distribution network localization method and system based on frequency sweep injection - Google Patents
A kind of one-phase earthing failure in electric distribution network localization method and system based on frequency sweep injection Download PDFInfo
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- CN107918079A CN107918079A CN201711144938.0A CN201711144938A CN107918079A CN 107918079 A CN107918079 A CN 107918079A CN 201711144938 A CN201711144938 A CN 201711144938A CN 107918079 A CN107918079 A CN 107918079A
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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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- 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
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- 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 present invention provides a kind of one-phase earthing failure in electric distribution network localization method and system based on frequency sweep injection, including some bit lines undetermined, the input terminal of some bit lines undetermined is connected with three-phase bus output terminal respectively, and the output terminal of some bit lines undetermined is sequentially connected electrically threephase potential transformer and three high-voltage switch gears；Some fault detectors that the controllable electric power being electrically connected with three high-voltage switch gears and scattering device are further included in some bit lines undetermined and is respectively positioned on after three high-voltage switch gears.By controllable electric power for three-phase bus injected frequency is wide and the adjustable electric current of amplitude, injection process utilizes frequency sweep method, Injection Current can be according to different power grid architecture parameter settings, and therefrom choose optimal injection characteristic current, region of being out of order is accurately positioned according to the real-time characteristic current value produced in each phase of three-phase bus of fault detector passback for optimal injection characteristic current, compared to existing positioning method, accuracy rate higher.
Description
Technical field
The invention belongs to the singlephase earth fault positioning field of three-phase isolated neutral system distribution network line, especially relate to
And a kind of one-phase earthing failure in electric distribution network localization method and system based on frequency sweep injection.
Background technology
The domestic and international widely used isolated neutral of medium voltage distribution network or through the grounding through arc method of operation, relative to height
Power transmission network is pressed, the probability that medium voltage distribution network breaks down is high, and wherein singlephase earth fault takes place frequently.Since single-phase fault is grounded
When, non-faulting phase-to-ground voltage rise, overvoltage may cause earth fault to be converted into phase fault, seriously endanger system
Insulation and equipment safety, cause tripping and power failure.For system safety operation, need rapid true after singlephase earth fault
Faulty line and position of failure point are determined, further to take troubleshooting measure.
Active localization method and two class of passive type localization method are broadly divided into method for locating single-phase ground fault at present.
Passive type Fault Locating Method is mainly to carry out positioning meter using the feature of failure caused voltage and current signal in itself
Calculate.But since this signal is easily disturbed, cause such a method positioning result not accurate enough.Active Fault Locating Method
Main to utilize AC signal injection method, this method is mainly noted using signal injection device by bus-bar potential transformer to system
Enter the ac current signal of specific frequency, fault location is realized by the position distribution of the signal on detection failure circuit.But
It is shadow of this method there is Injection Signal by the shunting of voltage transformer capacity limit and distribution capacity to Injection Signal
Ring, for the distribution network line framework of different parameters distribution, fault location failure is easy to cause using this method.
The singlephase earth fault of three-phase isolated neutral system distribution network line is determined in conclusion further improving
Position accuracy is problem to be solved.
The content of the invention
The present invention provides a kind of single-phase grounding fault positioning and method based on frequency sweep injection, to improve three
The positioning accuracy of the singlephase earth fault of phase isolated neutral system distribution network line.
In a first aspect, the single-phase grounding fault positioning provided by the invention based on frequency sweep injection, if including
Dry bar bit line undetermined, the input terminal of some bit lines undetermined are connected with power distribution network three-phase bus output terminal respectively, institute
The output terminal for stating some bit lines undetermined is sequentially connected electrically threephase potential transformer and three high-voltage switch gears.Further include and institute
The centralized processing device that threephase potential transformer and three high-voltage switch gears are electrically connected is stated, and it is electric with three high-voltage switch gears
The controllable electric power of connection, the other end ground connection of the controllable electric power.Scattering device is further included in some bit lines undetermined
Some fault detectors that are upper and being respectively positioned on after three high-voltage switch gears；All fault detectors with the concentration
Processor communication connects.
Preferably, in the above-mentioned single-phase grounding fault positioning based on frequency sweep injection, the controllable electric power is
Cascaded H-bridges.
Preferably, in the above-mentioned single-phase grounding fault positioning based on frequency sweep injection, close to the controllable electric
The return current detection device being electrically connected with the centralized processing device is provided with the ground terminal in source.
Preferably, in the above-mentioned single-phase grounding fault positioning based on frequency sweep injection, the centralized processing device
Including three-phase bus real-time voltage receiving module, single-phase fault judgment module, the controllable electric power access event over the ground being sequentially connected electrically
Hinder phase control module, frequency sweep injection order sending module, real-time characteristic current receiv module and singlephase earth fault locating module；
Wherein, real-time voltage receiving module is electrically connected the three-phase bus with the threephase potential transformer over the ground, the controllable electric power
Access failure phase control module and the high-voltage switch gear is electrically connected, the frequency sweep injection order sending module and the controllable electric power
It is electrically connected, the real-time characteristic current receiv module is communicated to connect with the fault detector.
Preferably, in the above-mentioned single-phase grounding fault positioning based on frequency sweep injection, the fault detector
Including characteristic current sending module, the characteristic current sending module is communicated to connect with the real-time characteristic current receiv module.
With reference to first aspect, the second aspect of the present invention provides a kind of based on frequency sweep injection positioning power distribution network single-phase earthing
The method of failure, applied in centralized processing device, this method includes,
Receive the power distribution network three-phase bus real-time voltage over the ground that threephase potential transformer is sent；
Judge whether single-phase fault occur according to the three-phase bus voltage-to-ground of stating, if so, continuing failure judgement phase；
Control is closed with the corresponding high-voltage switch gear of the failure so that controllable electric power accesses the failure phase；
Localization of fault order is sent to the controllable electric power, so that it utilizes frequency sweep normal direction failure phase injected frequency and width
It is worth adjustable voltage or electric current, and to produce the characteristic current on the circuit of the upstream of the failure phase fault point；
The real-time characteristic set of currents that each fault detector is sent in failure phase is received, every group of real-time characteristic electric current is equal
Including three characteristic currents corresponding with three-phase bus same position, the real-time characteristic electric current carries corresponding failure and refers to
Show the positional information for surveying device；
Determine in the fault detector corresponding to the unequal real-time characteristic set of currents of amplitude of three characteristic currents, distance
Position after the farthest fault detector of the output terminal of three-phase bus is abort situation.
Preferably, the earth current of detection controllable electric power in real time is further included.
Preferably, tell and send localization of fault order to the controllable electric power, so that it utilizes frequency sweep normal direction failure phase
Injected frequency and the adjustable voltage of amplitude or electric current, and cause on the circuit of the upstream of the failure phase fault point described in generation
Characteristic current specifically refers to：
Determine the initial frequency value, frequency step and termination frequency values of the injected frequency；
Determine initial current/voltage magnitude, current/voltage step-length and terminate current/voltage amplitude；
Controllable electric power presses frequency step, changes output frequency to frequency values are terminated from initial frequency value, completes a frequency sweep,
By current/voltage step-length, change output current/voltage magnitude to terminating current/voltage amplitude from initial current/voltage magnitude,
Repeat frequency sweep；Terminate untill centralized processing device determines position of failure point or reaches termination current/voltage amplitude
Frequency sweep injection process, so that producing the characteristic current in the lines upstream of the failure phase fault point.
Preferably, the injected frequency fcomMeet following range intervals：
Wherein, R is trouble point grounding resistance, and C0 is normal operation system uniline direct-to-ground capacitance value, and ω is power supply
Angular frequency,For the voltage magnitude in earth fault phase,For neutral point voltage-to-ground amplitude；The Injection Current amplitude
Scope is less than or equal to 1st/20th of the earth current.
Preferably, the Injection Current is direct current or alternating current.
The present invention is using active positioning method positioning singlephase earth fault.It is to be injected in three-phase bus by controllable electric power
Electric current, controllable electric power Injection Current, wide with frequency, amplitude is adjustable, and can realize the advantages of voltage or electric current export.Note
Enter process and utilize frequency sweep method, Injection Current can be according to different power grid architecture parameter setting scopes, and therefrom choose optimal note
Enter characteristic current, according to the real-time spy produced in each phase of three-phase bus of fault detector passback for optimal injection characteristic current
Sign current value is accurately positioned region of being out of order, compared to existing positioning method, accuracy rate higher.
Brief description of the drawings
Fig. 1 is the structure of the single-phase grounding fault positioning provided in an embodiment of the present invention based on frequency sweep injection
Schematic diagram；
Fig. 2 is the structure diagram of character voltage injection circuit in Fig. 1；
Fig. 3 is the structure diagram that device is focused in Fig. 1；
Wherein 1- focuses on device, and real-time voltage receiving module, 102- single-phase faults judge mould to 101- three-phase bus over the ground
Block, 103- controllable electric powers access failure phase control module, 104- frequency sweeps injection order sending module, 105- real-time characteristic electric currents connect
Receive module, 106- singlephase earth fault locating modules, 2- threephase potential transformers, 3- high-voltage switch gears, 4- controllable electric powers, 5- failures
Indicator, 501- characteristic current sending modules, 6- return current detection devices.
Embodiment
The present invention provides a kind of single-phase grounding fault positioning and method based on frequency sweep injection, to improve three
The positioning accuracy of the singlephase earth fault of phase isolated neutral system distribution network line.Carry out by way of examples below
Explanation.
Single-phase grounding fault positioning provided by the invention based on frequency sweep injection, including some to be positioned
Circuit, the input terminal of some bit lines undetermined are connected with power distribution network three-phase bus output terminal respectively.Described some are treated
The output terminal of positioning line fault is sequentially connected electrically threephase potential transformer and three high-voltage switch gears.Further include and the three-phase voltage
The centralized processing device that mutual inductor and three high-voltage switch gears are electrically connected, and be electrically connected with three high-voltage switch gears controllable
Power supply, the other end ground connection of the controllable electric power.Scattering device is further included in some bit lines undetermined and is respectively positioned on
Some fault detectors after three high-voltage switch gears；All fault detectors focus on device communication link with described
Connect.
Alignment system provided by the invention, the bit line undetermined of three-phase bus connection can be a plurality of, and the present invention is to circuit
Bar number does not limit.In implementation, busbar only need to be divided into some branches, each bar bit line undetermined is accessed this some points respectively
Branch so that all bit lines undetermined are accessed in three-phase bus.Please refer to Fig.1, the figure shows offer of the embodiment of the present invention
Based on frequency sweep injection single-phase grounding fault positioning structure.The embodiment is connected with the output terminal of three-phase bus
Connect and illustrate exemplified by three bit lines undetermined.As shown in the figure, the alignment system includes three bit lines undetermined, this three undetermined
The input terminal of bit line is connected with power distribution network three-phase bus output terminal respectively, and the output terminal of this three bit lines undetermined is electric successively
Connect threephase potential transformer 2 and three high-voltage switch gears 3.Three high-voltage switch gears are K1、K2And K3, respectively with three-phase bus
A phases, B phases are connected with C.The centralized processing device 1 being electrically connected with threephase potential transformer 2 and three high-voltage switch gears 3 is further included,
And the controllable electric power 4 being electrically connected with three high-voltage switch gears 3, the other end ground connection of the controllable electric power 4.
Scattering device is further included in some bit lines undetermined and is respectively positioned on after three high-voltage switch gears 3
Some fault detectors 5；All fault detectors are communicated to connect with the centralized processing device (1).As shown in Figure 1, therefore
Barrier indicator mark is A to F.All fault detectors are communicated to connect with the centralized processing device 1.Fault detector is exactly
Fault detector, possesses the functions such as current detecting, fault alarm.It can identify the specific frequency electric current of injection, read feature electricity
Flow amplitude information.A to F includes being connected to corresponding three fault detectors of three-phase bus same position.In bit line 1 undetermined
Access is A and D, and that accessed in bit line 2 undetermined is B and F, and that accessed in bit line 3 undetermined is C and E.
The course of work of the system is divided into three phases.First stage is to judge whether single-phase fault occur；Second
Stage is mutually to inject characteristic current using frequency sweep normal direction failure, and adjustment injection characteristic current is optimal injection feature before injection starts
Electric current, the 3rd is the single-phase earthing position that failure phase is positioned when Injection Current is optimal injection characteristic current.Below according to this
The order of three working stages illustrates the course of work of the system.
Threephase potential transformer 4 detects power distribution network three-phase bus real-time voltage, and this is real-time over the ground in the first phase
Voltage-to-ground is sent to centralized processing device.With reference to Fig. 1, three real-time voltage-to-ground U have been obtainedA、UBAnd UC, when no single-phase earthing
During failure, UA、UBAnd UCIt should be equal or approximately equal, and if UA、UBOr UCIn occur it is wherein a certain be lower suddenly, remaining
Two-phase raises but is less than line voltage, then judges singlephase earth fault, and U occurA、UBOr UCWhat middle real-time voltage reduced is mutually
Failure phase is, it is necessary at once to this fault location.With reference to Fig. 1, it is assumed that Single-phase Ground Connection Failure Ig, failure is mutually C phases.Positioning
Before, the control of centralized processing device 1 and the corresponding high-voltage switch gear K of C3Closure so that controllable electric power 4 accesses the C phases.So, close
Fault detector C and E is allowed for after conjunction C phases to connect with controllable electric power 4.
The character voltage injection circuit that this method uses is as shown in Fig. 2, controllable electric power 4 uses cascaded H-bridges topology, Mei Geji
The DC side of connection H bridges is all powered using DC power supply, and by PWM modulation technology, cascaded H-bridges can be on C phases busbar and ground
Between inject the character voltage of certain frequency and amplitude.The controllable electric power can be cascaded H-bridges.Electricity is injected using cascaded H-bridges
Stream is because following two reasons：First, cascaded H-bridges are the common structure forms of direct screening equipment, when can meet direct linked network
Output voltage requirement, can match different cascaded H-bridges for the power grid of different frameworks.Second, cascaded H-bridges are specific in output
During frequency current, harmonic wave is less, removes transformer coupled link so that the current amplitude increase that can be injected, is conducive to the standard positioned
True property.
The Injection Current of the controllable electric power of cascaded H-bridges can be that direct current injection mode can also be exchange injection mode, not have
There is regulation according to concrete condition two kinds of injection modes can be selected to be applied in combination.
In second stage, centralized processing device 1 sends localization of fault order to the controllable electric power 4, so that it is utilized
Frequency sweep normal direction C phases injected frequency and the adjustable voltage of amplitude or electric current, and cause in C phase faults point IgUpstream circuit on produce
Raw characteristic current.After a certain amount of feature voltage-to-ground is injected at C phase busbares, the spy of identical frequency can be produced in C phase lines
Electric current is levied, this characteristic current can be from line mutual-ground capacitor C1With earth point IgFlow through, and flow back to cascaded H-bridges.C and E on C circuits
Fault detector can measure characteristic current amplitude information, and these real-time characteristic electric currents carry corresponding positional information, this
Positional information refers to geographical location information.By wireless communication by real-time characteristic current back centralized processing system, so as to
Judge the specific section of earth point.It is provided with what is be electrically connected with the centralized processing device at the ground terminal of the controllable electric power
Return current detection device, for detecting the Injection Current from controllable electric power outflow in real time, feature electricity is mutually generated by failure
Stream, and back flow current value when flowing back to cascaded H-bridges.This back flow current value is back to the real-time of centralized processing device with fault detector
Characteristic current value is combined, and as feedback and can adjust the foundation of the real-time Injection Current of controllable electric power.Can be with by this feedback
By controllable electric power your Injection Current adjust to the most matched optimal injection characteristic current of power grid architecture parameter.The process of adjustment
Realized using frequency sweep injection method.
In second stage, frequency sweep injection method specifically refers to：Determining initial frequency value, the frequency steps of the injected frequency
Long and termination frequency values, it is controllable after determining initial current/voltage magnitude, current/voltage step-length and terminating current/voltage amplitude
Power supply presses frequency step, changes output frequency to frequency values are terminated from initial frequency value, a frequency sweep is completed, by current/voltage
Step-length, changes output current/voltage magnitude to current/voltage amplitude is terminated from initial current/voltage magnitude, repeats to sweep
Frequently；Terminate frequency sweep untill centralized processing device determines position of failure point or reaches termination current/voltage amplitude to inject
Journey, so that producing the characteristic current in the lines upstream of the failure phase fault point.
Wherein, it is optimal injection characteristic current selection concrete operations for：First according to neutral point voltage-to-ground UA、UBAnd therefore
Hinder phase voltage UCCalculate grounding resistance.In order to reduce shunt influence of the failure phase line distribution capacity to line characteristics electric current,
The scope of Injection Current frequency can be obtained according to the relation between ground resistance and the impedance of distribution capacity.Again, Fig. 1 is passed through
Shown in the return current detection device 6 that is set at the ground terminal of controllable electric power 4 detect in real time controllable electric power ground connection it is electric
Stream.Consider influence of the Injection Current to system, according to fault detector accuracy of detection and earth current size, determine Injection Current
Amplitude range.Experiment show that the Injection Current amplitude range is less than or equal to electric during 1st/20th of the earth current
Influence of the stream to system is smaller and is easy to detect at the same time.Earth current is sent to centralized processing device 1, and centralized processing device is according to ground connection
The amplitude of the output current of current control controllable electric power is less than or equal to 1st/20th of the earth current.
Injected frequency fcomMeet following range intervals：
Wherein, R is trouble point grounding resistance, C0For normal operation system uniline direct-to-ground capacitance value, ω is power supply
Angular frequency,For the voltage magnitude in earth fault phase,For neutral point voltage-to-ground amplitude.For same power grid electricity
Road,WithFor constant.
After the frequency range of electric current injection and amplitude range is determined, the injection of controllable electric power output voltage or electric current are determined
Injection.If electric current injects, initial current is chosen to be minimum value, during frequency sweep, frequency from the optional scope of calculating most
Big value starts, and 0Hz is gradually adjusted by frequency step and completes a frequency sweep, increases Injection Current, Zhi Daoji according to current steps
Untill middle processing system can receive the signal of fault detector transmission.If voltage injects, initial voltage is swept since 0v
During frequency, frequency gradually adjusts 0Hz since the maximum of the optional scope of calculating, by frequency step and completes once to sweep
Frequently, injecting voltage is increased according to voltage step size, untill centralized processing system can receive the signal of fault detector transmission.
The process of frequency sweep injection method is illustrated with concrete numerical value below.The direct-to-ground capacitance C of power distribution network is obtained first0, connect
Ground resistance R.Original frequency is arranged to the maximum of the injection characteristic frequency calculated, is sequentially reduced with frequency step 5Hz, terminates frequency
Rate 0Hz.Under electric current injection, for ease of detection of the fault detector to characteristic current, initial current amplitude is arranged to 50mA, electric current
With step-length 10mA increase, terminate current amplitude according to earth current be dimensioned to 5% earth current (generally 20A~
30A sizes).Under voltage injection, initial voltage amplitude is arranged to 0V, and voltage step size is arranged to 30V, and final voltage amplitude is according to dress
The DC voltage put and determine, be arranged to the 5% of DC voltage, so ensure all the time in the available range of capacity of device.
Set according to above-mentioned parameter, change output frequency to frequency values are terminated from initial frequency value, a frequency sweep is completed, by electric current/electricity
Step-length is pressed, changes output current/voltage magnitude to current/voltage amplitude is terminated from initial current/voltage magnitude, repeats to sweep
Frequently；Terminate frequency sweep untill centralized processing device determines position of failure point or reaches termination current/voltage amplitude to inject
Journey.
In the phase III, by the above process, it is determined that after optimal injection characteristic current, for this optimal characteristics electric current
Value is accurately positioned region of being out of order.Specifically position fixing process is：Determine the unequal real-time characteristic electricity of amplitude of three characteristic currents
In fault detector corresponding to stream group, the position after the fault detector farthest apart from the output terminal of three-phase bus is failure
Position.With reference to Fig. 1, detailed process is：Three fault detectors in C and E fault detectors positioned on same position will detect
Characteristic current amplitude be transmitted back to centralized processing device.When singlephase earth fault occurs, same position before trouble point
Occur that a characteristic quantity hands over other two electric currents substantially increased situation in fault detector in three characteristic currents, and failure
The current value of three characteristic currents of the fault detector of the position after point can be basically identical.Therefore, can be by concentrating
The feature electricity of all passbacks is compared in processor, is judged in same position with larger characteristic current amount for failure
Phase, and according to the positional information carried in characteristic current, determine the unequal real-time characteristic electric current of amplitude of three characteristic currents
In the corresponding fault detector of group, the position after the fault detector farthest apart from the output terminal of three-phase bus is fault bit
Put.With reference to Fig. 1, failure is mutually C phases, abort situation Ig, when being filled with characteristic current to C phases, detected by C fault detectors
Characteristic current amount, and E fault detectors are not detected by characteristic current amount, and centralized processing system then can be according to passing letter back
Number, it may be determined that Single-phase Ground Connection Failure is on the distribution line between C fault detectors and E fault detectors.
Although the fault detector in Fig. 1 in failure phase merely illustrates C and E, and trouble point IgFault detector before
Merely illustrate C.But Fig. 1 is only exemplary, if power distribution network length is longer and failure rate is higher, indicating fault can be improved
The layout density of device, for example, being sequentially arranged five fault detector C between C and E in Fig. 11-C5, in order to more accurate
Find earth point IgIt is located at C actually1-C5Exact position, can be by injecting multiple and different frequencies and magnitude current signal.Collection
Middle processor obtains multiple C1-C5Pass back three groups of real-time characteristic electric currents.The Injection Current of one frequency and amplitude, corresponding one
The secondary real-time characteristic electric current passed back.For example, after returning for the first time, in C1-C5In in three characteristic currents, there is a feature
Amount hands over other two electric currents substantially increased situation, after n-th passback, in C1-C5In in three characteristic currents, only C1-C3Go out
An existing characteristic quantity hands over other two electric currents substantially increased situation, C4-C5Do not occur such case, it is seen that according to multiple passback
Information can more accurately determine Single-phase Ground Connection Failure, until locking trouble point Ig exact positions.Wherein, the spy of different frequency
The frequency range of sign electric current meets above-mentioned fcomScope.
In conclusion the present invention is using active positioning method positioning singlephase earth fault.It is three-phase by controllable electric power
Injection Current in busbar, controllable electric power Injection Current, wide with frequency, amplitude is adjustable, and can realize that voltage or electric current are defeated
The advantages of going out.Injection process utilizes frequency sweep method, and Injection Current can be according to different power grid architecture parameter setting scopes, and therefrom
Optimal injection characteristic current is chosen, is produced according in each phase of three-phase bus of fault detector passback for optimal injection characteristic current
Raw real-time characteristic current value is accurately positioned region of being out of order, compared to existing positioning method, accuracy rate higher.
In order to realize three above-mentioned working stages, please refer to Fig.3, the figure shows the structure of centralized processing device.It is described
Centralized processing device includes the three-phase bus that is sequentially connected electrically real-time voltage receiving module 101, single-phase fault judgment module over the ground
102nd, controllable electric power access failure phase control module 103, frequency sweep injection order sending module 104, real-time characteristic current receiv mould
Block 105 and singlephase earth fault locating module 106；Wherein, the three-phase bus over the ground real-time voltage receiving module 101 with it is described
Threephase potential transformer 2 is electrically connected, and the controllable electric power access failure phase control module 103 and the high-voltage switch gear 3 are electrically connected,
The frequency sweep injection order sending module 104 is electrically connected with the controllable electric power 4, the real-time characteristic current receiv module 105
It is connected with fault detector communication 501.Communication connection mode can be preferably communication.The fault detector
5 include characteristic current sending module, and the characteristic current sending module 501 is logical with the real-time characteristic current receiv module 105
Letter connection.Centralized processing device the course of work be：Real-time voltage receiving module 101 receives three-phase voltage mutual inductance to three-phase bus over the ground
Device 2 send real-time three phase-to-ground voltage, single-phase fault judgment module 102 according to it is described state three-phase bus voltage-to-ground judge be
It is no single-phase fault occur, if so, continuing failure judgement phase.After phase is out of order in judgement, controllable electric power access failure phase control
Module 103 is controlled to be closed with the corresponding high-voltage switch gear of the failure so that controllable electric power accesses the failure phase.Frequency sweep is injected
Order sending module 104 sends localization of fault order to the controllable electric power, so that it is mutually injected using frequency sweep normal direction failure
Frequency and the adjustable voltage of amplitude or electric current, and to produce the feature on the circuit of the upstream of the failure phase fault point
Electric current.Real-time characteristic current receiv module 105 receives 501 transmission of fault detector communication in each fault detector in failure phase
Real-time characteristic set of currents.Singlephase earth fault locating module 106 determines that the amplitude of three characteristic currents is unequal special in real time
Levy in the fault detector corresponding to set of currents, the position after the fault detector farthest apart from the output terminal of three-phase bus is
Abort situation.Detailed process may be referred to above-mentioned on the single-phase grounding fault positioning that is injected based on frequency sweep
The introduction of the course of work of three phases, this is not repeated.
It should be noted that the fault detector in Fig. 1 is several in the fault detector in Fig. 3, labeled as A-E.
In practice, the clipping room of fault detector can be determined, in general, easily being sent out in failure according to actual motion circuit away from being not specified by
In circuit, a fault detector is placed every 5km.The easy hair line road of non-faulting, distance can be increased suitably.It is single-phase in order to occur
After earth fault, track walker quickly excludes earth fault, facilitates the region of line walking sparse can install, it has not been convenient to the area of line walking
Domain needs intensive installation.The geographical accuracy of present invention positioning Single-phase Ground Connection Failure has with current detector actual installation distance
Close, installation is more intensive, and geo-localisation information is more accurate.
In conclusion using the one-phase earthing failure in electric distribution network localization method provided by the invention based on frequency sweep injection, press
According to the course of work in above three stage, apply and determine in the one-phase earthing failure in electric distribution network provided by the invention based on frequency sweep injection
In the system of position, it is possible to increase the positioning accuracy of the singlephase earth fault of three-phase isolated neutral system distribution network line.
The above is only the embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of single-phase grounding fault positioning based on frequency sweep injection, it is characterised in that undetermined including some
Bit line, the input terminal of some bit lines undetermined are connected with power distribution network three-phase bus output terminal respectively, described some
The output terminal of bit line undetermined is sequentially connected electrically threephase potential transformer (2) and three high-voltage switch gears (3)；
The centralized processing device (1) being electrically connected with the threephase potential transformer (2) and three high-voltage switch gears (3) is further included, with
And the controllable electric power (4) being electrically connected with three high-voltage switch gears (3), the other end ground connection of the controllable electric power (4)；
Scattering device is further included in some bit lines undetermined and is respectively positioned on after three high-voltage switch gears (3)
Some fault detectors (5)；All fault detectors are communicated to connect with the centralized processing device (1).
2. the single-phase grounding fault positioning according to claim 1 based on frequency sweep injection, it is characterised in that
The controllable electric power (4) is cascaded H-bridges.
3. the single-phase grounding fault positioning according to claim 1 based on frequency sweep injection, it is characterised in that
The return current being electrically connected with the centralized processing device (1) is provided with the ground terminal of the controllable electric power (4) and detects dress
Put (6).
4. the single-phase grounding fault positioning according to claim 1 based on frequency sweep injection, it is characterised in that
Real-time voltage receiving module (101), single-phase fault judge the three-phase bus that the centralized processing device includes being sequentially connected electrically over the ground
Module (102), controllable electric power access failure phase control module (103), frequency sweep injection order sending module) (104), real-time characteristic
Current receiv module (105) and singlephase earth fault locating module (106)；Wherein, real-time voltage connects the three-phase bus over the ground
Receive module (101) to be electrically connected with the threephase potential transformer (2), the controllable electric power access failure phase control module (103)
It is electrically connected with the high-voltage switch gear (3), the frequency sweep injection order sending module (104) is electrically connected with the controllable electric power (4),
The real-time characteristic current receiv module (105) communicates to connect with the fault detector (5).
5. the single-phase grounding fault positioning according to claim 4 based on frequency sweep injection, it is characterised in that
The fault detector includes characteristic current sending module (501), the characteristic current sending module (501) and the spy in real time
Levy current receiv module (105) communication connection.
6. it is a kind of based on frequency sweep injection one-phase earthing failure in electric distribution network localization method, applied to centralized processing device in, its feature
It is, including：
Receive the power distribution network three-phase bus real-time voltage over the ground that threephase potential transformer is sent；
Judge whether single-phase fault occur according to the three-phase bus voltage-to-ground of stating, if so, continuing failure judgement phase；
Control is closed with the corresponding high-voltage switch gear of the failure so that controllable electric power accesses the failure phase；
Localization of fault order is sent to the controllable electric power, so that it can using frequency sweep normal direction failure phase injected frequency and amplitude
The voltage or electric current of tune, and to produce the characteristic current on the circuit of the upstream of the failure phase fault point；
The real-time characteristic set of currents that each fault detector is sent in failure phase is received, every group of real-time characteristic electric current includes
Three characteristic currents corresponding with three-phase bus same position, the real-time characteristic electric current carry corresponding indicating fault and survey
The positional information of device；
Determine in the fault detector corresponding to the unequal real-time characteristic set of currents of amplitude of three characteristic currents, apart from three-phase
Position after the farthest fault detector of the output terminal of busbar is abort situation.
7. the one-phase earthing failure in electric distribution network localization method according to claim 6 based on frequency sweep injection, it is characterised in that
Further include the earth current of detection controllable electric power in real time.
8. the one-phase earthing failure in electric distribution network localization method according to claim 7 based on frequency sweep injection, it is characterised in that
Tell and send localization of fault order to the controllable electric power, so that it can using frequency sweep normal direction failure phase injected frequency and amplitude
The voltage or electric current of tune, and make it that producing the characteristic current on the circuit of the upstream of the failure phase fault point is specifically
Refer to：
Determine the initial frequency value, frequency step and termination frequency values of the injected frequency；
Determine initial current/voltage magnitude, current/voltage step-length and terminate current/voltage amplitude；
Controllable electric power presses frequency step, changes output frequency to frequency values are terminated from initial frequency value, a frequency sweep is completed, by electricity
Stream/voltage step size, changes output current/voltage magnitude to current/voltage amplitude is terminated from initial current/voltage magnitude, repeats
Carry out frequency sweep；Terminate frequency sweep untill centralized processing device determines position of failure point or reaches termination current/voltage amplitude
Injection process, so that producing the characteristic current in the lines upstream of the failure phase fault point.
9. the one-phase earthing failure in electric distribution network localization method according to claim 8 based on frequency sweep injection, it is characterised in that
The injected frequency fcomMeet following range intervals：
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Wherein, R is trouble point grounding resistance, C0For normal operation system uniline direct-to-ground capacitance value, ω is power supply angular frequency
Rate,For the voltage magnitude in earth fault phase,For neutral point voltage-to-ground amplitude；The Injection Current amplitude range
Less than or equal to 1st/20th of the earth current.
10. the one-phase earthing failure in electric distribution network localization method according to claim 5 based on frequency sweep injection, its feature exist
In the Injection Current is direct current or alternating current.
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