CN108336720B - Single-phase earthing traveling-wave protection method and device and computer equipment - Google Patents
Single-phase earthing traveling-wave protection method and device and computer equipment Download PDFInfo
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- CN108336720B CN108336720B CN201810066880.0A CN201810066880A CN108336720B CN 108336720 B CN108336720 B CN 108336720B CN 201810066880 A CN201810066880 A CN 201810066880A CN 108336720 B CN108336720 B CN 108336720B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/265—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured making use of travelling wave theory
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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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Abstract
The present invention provides a kind of single-phase earthing traveling-wave protection method and device and computer equipments.Wherein, method includes: to disturb when traveling wave occurs for route, judges whether disturbance occurs the non-transformer end of relay in the line；Occur to judge whether relay non-transformer end occurs singlephase earth fault at the non-transformer end of relay when determining to disturb；When determining that singlephase earth fault occurs, trip signal is issued based on the time delays adjusted according to stepped principle；If the relay issues trip signal according to trip signal, the relay of the route non-transformer side will issue trip signal according to the situation of change of the three-phase main-frequency electrical quantity detected.According to the technical solution of the present invention; realize power line protection successive Trip; quickly selectively from two tip cut-off singlephase earth fault of route; condition is provided for the power supply of fast quick-recovery regular link; improve power circuit operational reliability; and communication channel is not needed, there is good economy and practicability.
Description
Technical field
The present invention relates to protecting electrical power systems and control technology field, protect in particular to a kind of single-phase earthing traveling wave
Maintaining method, a kind of single-phase earthing traveling-wave protection device, a kind of computer equipment, a kind of computer readable storage medium.
Background technique
Most of existing distribution network protection technology is using traditional overcurrent protection adjusted according to trapezoidal principle.This skill
Art is suitable on China widely applied single supply radial multistage branch power lines road.
However, at present the power network neutral point in China mostly use greatly it is earth-free or through grounding through arc, i.e. neutral point
Non-effectively earthed system.In this distribution system, when singlephase earth fault occurs, fault current amplitudes very little, to failure
Detection and traditional overcurrent protection cause very big challenge.There is presently no quickly selectively one-phase ground protection, and it is single
After phase ground fault occurs, the raising of phase voltage may cause apparatus insulated breakdown, be further development of phase-to phase fault, so
It should give and timely identify and handle.
Existing power line protection technology includes current protection based on single-end electrical quantity, voltage protection and apart from guarantor
Shield, current differential protection, Unit protection based on Two-Terminal Electrical Quantities etc..But after power circuit breaks down, failure
Transient state travelling wave information afterwards all includes the fault messages such as failure generation, the position of fault as power frequency stable state electrical quantity.It is based on
Transient fault traveling wave information similarly may be constructed power line protection.And the protection technique ratio based on transient state travelling wave is based on power frequency
The protection technique of stable state has inborn rapidity.Therefore, research the relay protection based on transient state travelling wave can favorably promote after
The development of electric protection technology.
Fault message based on transient state travelling wave has been used for constructing traveling-wave protection, travelling wave ranging and traveling wave route selection, has obtained
Some progress.But the existing protection technique based on traveling wave information also has the deficiency of its own, such as due to being difficult to differentiate between event
Hinder the traveling wave that the traveling wave generated and system disturbance such as lightning stroke even switch operation generate and be easy to malfunction, in multistage branch power lines
It cannot be from two tip cut-off failure of faulty line in road.
Therefore, how a kind of single-phase ground protection method comprehensively utilizing the traveling-wave protection based on Polarity comparision is provided,
It can be quickly selectively from two tip cut-off of faulty line in the system with non effectively earth ed neutral on the road of branch power lines containing multistage
Singlephase earth fault becomes a technical problem to be solved urgently.
Summary of the invention
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, it is an aspect of the invention to propose a kind of single-phase earthing traveling-wave protection method.
Another aspect of the present invention is to propose a kind of single-phase earthing traveling-wave protection device.
Another aspect of the invention is to propose a kind of computer equipment.
Another aspect of the present invention is to propose a kind of computer readable storage medium.
In view of this, the invention proposes a kind of single-phase earthing traveling-wave protection methods, comprising: disturbed when traveling wave occurs for route
It is dynamic, judge whether disturbance occurs at the non-transformer end of route source side relay；When determine disturbance occur route source side after
The non-transformer end of electric appliance, judges whether the non-transformer end of line electricity source relay occurs singlephase earth fault；When judgement occurs
Singlephase earth fault issues trip signal based on the time adjusted according to stepped principle；If line electricity source relay according to
Trip signal issues trip signal, and the relay of the route non-transformer side will be according to the change of the three-phase main-frequency electrical quantity detected
Change situation, issues trip signal.
After power circuit breaks down, electric system enters stable state after failure after transient process.Transient state after failure
Traveling wave information and stable state power frequency information are all a part of phenomenon of the failure, also can faults, wherein transient state travelling wave information is anti-
The microcosmic situation after AC system breaks down is reflected, system is macro after stable state power frequency message reflection AC system breaks down
See situation.It will be generated after power circuit breaks down, in system from fault point at the beginning of the fault traveling wave of Systematic Communication, failure
The wave that begins only is influenced by electrical equipment on the path passed through, and is not influenced by the electrical equipment that traveling wave in system is not yet passed through,
Therefore, in measurement point, initial traveling wave is not influenced by neutral grounding mode.In addition, working as the pros of our specified current flow traveling waves
To when being directed toward next route for bus, after protected circuit breaks down, the initial current that source side relay test arrives is electric
Pressure polarity of traveling wave is on the contrary, the relay test initial current voltage traveling wave polarity that arrives in non-transformer side is identical.
Single-phase earthing traveling-wave protection method according to the present invention, neutral point on the road of branch power lines containing multistage is non-effective to be connect
Either branch route (i.e. the radial distribution line of the single ended power supply of single breaker disjunction) in ground system is protected based on detection
The traveling wave electric amount at route both ends judges whether disturbed on protected circuit, if being disturbed, is based on initial traveling wave
Polarity comparision, judge that disturbance occurs in relay which side, it is electrical based on power frequency if occurring at the non-transformer end of relay
Amount, judges whether relay non-transformer end has occurred singlephase earth fault, and be distinguish to failure and disturbance, if relay
Singlephase earth fault has occurred in non-transformer end, then based on the time delays waiting movement adjusted according to stepped principle, works as the time
The shortest relay of delayed setting takes the lead in after tripping, and faulty line is removed from source side, the non-transformer side relay of opposite end
Using the situation of change for the three-phase main-frequency electrical quantity experienced specifically, non-transformer side relay will detect that three-phase current has
Valid value levels off to zero, in this, as criterion, issues trip signal, cuts off from non-transformer side by faulty line.Through the invention
Single-phase earthing traveling-wave protection method can not only that accurately and quickly detect singlephase earth fault, and can be quickly selective
Power line protection successive Trip is realized from two tip cut-off singlephase earth fault of faulty line in ground, is that fast quick-recovery is normal
Line powering provides condition, improves power circuit operational reliability, and do not need communication channel, has good economy and reality
The property used.
Traveling wave in the present invention refers to running power equipment due to passing in the power system caused by being disturbed
The electromagnetic wave broadcast.
In the above-mentioned technical solutions, it is preferable that according to stepped principle adjust time, specifically: according to relay with
Corresponding setting time is arranged in the distance of power supply；Wherein, distance is closer, and setting time is longer.
In the technical scheme, relay is closer apart from power supply, corresponding to setting time it is longer.If system occurs
Traveling wave disturbance judges that disturbance occurs at which end of relay, if occurring to judge relay without electricity at relay non-transformer end
When whether source has occurred singlephase earth fault, if singlephase earth fault has occurred, each such relay will be according to corresponding
Setting time delay after act, after the shortest relay of being delayed issues trip signal, faulty line is removed from source side,
The non-transformer side relay of its other side utilizes the situation of change for the three-phase main-frequency electrical quantity experienced, to issue trip signal,
It is cut off from non-transformer side by faulty line.To realize power line protection successive Trip, that accurately and quickly detect
Singlephase earth fault, quickly selectively from two tip cut-off singlephase earth fault of route.
In any of the above-described technical solution, it is preferable that this method further include: the three-phase voltage row at acquisition route both ends in real time
Wave and three-phase current traveling wave；The analog quantity of the analog quantity of three-phase voltage traveling wave or three-phase current traveling wave and preset threshold are compared
Compared with if the analog quantity of the analog quantity of three-phase voltage traveling wave or three-phase current traveling wave greater than preset threshold, determines that traveling wave, which occurs, disturbs
It is dynamic.
In the technical scheme, in real time according to three-phase electricity on preset sample frequency (such as 1Mhz) synchronous acquisition protected circuit
Press traveling wave and three-phase current traveling wave；The analog input level of real-time three-phase voltage traveling wave or three-phase current traveling wave is more electric
Road judges traveling wave disturbance whether has occurred in system compared with preset threshold.Wherein, the setting of threshold value can be 200mv.Tool
For body, when three-phase voltage traveling wave analog quantity or three-phase voltage traveling wave analog quantity are greater than preset threshold, then decision-making system occurs
Traveling wave disturbance.
It should be appreciated by those skilled in the art that sample frequency is 1Mhz, but not limited to this；Preset threshold is 200mv, but not
It is limited to this.
In any of the above-described technical solution, it is preferable that judge whether disturbance occurs in route source side relay without electricity
The step of source, comprising: storing initial three-phase voltage traveling wave and initial three-phase current traveling wave respectively calculate three-phase voltage traveling wave
The modulus of modulus and three-phase current traveling wave；The modulus of the modulus of three-phase voltage traveling wave and three-phase current traveling wave is carried out four layers respectively
Wavelet transformation extracts corresponding wavelet modulus maxima according to respective wavelet transform result respectively；Respectively to every in four layers
The wavelet modulus maxima of the modulus of one layer of three-phase voltage traveling wave becomes with the small echo of the modulus of corresponding three-phase current traveling wave
It changes the mold maximum and carries out Polarity comparision；If there is the pole of the wavelet modulus maxima of the modulus of at least three layers of three-phase voltage traveling wave
Property with the polarity of the wavelet modulus maxima of the modulus of corresponding three-phase current traveling wave on the contrary, then determine disturbance occur in route
The non-transformer end of source side relay.
In any of the above-described technical solution, it is preferable that the modulus of three-phase voltage traveling wave includes three-phase voltage traveling wave line mould point
Amount and/or three-phase voltage traveling wave zero _exit, the modulus of three-phase current traveling wave include three-phase current traveling wave Aerial mode component and/or three
Phase current traveling wave zero _exit.
In the technical scheme, if monitoring that traveling wave disturbance, the modulus to three-phase voltage traveling wave and three have occurred in system
The modulus of phase current traveling wave carries out four layers of wavelet transformation respectively, and the primary of cubic B-spline function can be selected in wavelet function herein
Derived function.Corresponding modulus maximum is extracted according to respective wavelet transform result.It is small by comparing four layers of modulus of voltage traveling wave
The polarity of wave conversion modulus maximum and four layers of wavelet modulus maxima of modulus of corresponding current traveling wave, whether to judge disturbance
Occur at the non-transformer end of relay.
Specifically, if monitoring that traveling wave disturbance, storing initial three-phase voltage traveling wave and initial three-phase have occurred in system
Current traveling wave, each 64 point data such as before and after disturbance.Phase-model transformation is carried out to three-phase voltage traveling wave, phase mode transformation matrix are using triumphant
Human relations Bell's matrix, to obtain three-phase voltage traveling wave Aerial mode component and three-phase voltage traveling wave zero _exit.Similarly, to three-phase current
Traveling wave carries out phase-model transformation, and transformation matrix uses triumphant human relations Bell matrix, to obtain three-phase current traveling wave Aerial mode component and three-phase
Current traveling wave zero _exit.
Four layers of wavelet modulus maxima of comparison voltage traveling wave Aerial mode component with four layers of corresponding current traveling wave Aerial mode component
The polarity of wavelet modulus maxima, if there is being no less than three layers of voltage traveling wave Aerial mode component and corresponding current traveling wave line mould
The wavelet modulus maxima polarity of component is on the contrary, then determine that disturbance occurs at relay non-transformer end；Alternatively, comparison voltage row
Four layers of wavelet modulus maxima of wave zero _exit and four layers of wavelet modulus maxima of corresponding current traveling wave zero _exit
Polarity, if there is being no less than three layers of voltage traveling wave zero _exit and the wavelet modulus maxima pole of current traveling wave zero _exit
Property on the contrary, then determine disturbance occur at relay non-transformer end；If above-mentioned be all unsatisfactory for, determine that disturbance occurs by protective wire
Other than road.According to the technical solution of the present invention, singlephase earth fault and disturbance can be distinguish, so as to avoid related skill
The traveling wave and system disturbance for being difficult to differentiate between failure generation in art are easy to malfunction as lightning stroke even switch operates the traveling wave generated
Problem.
It should be appreciated by those skilled in the art that three-phase voltage traveling wave and three-phase current traveling wave the disturbance front and back acquired in real time is each
64 point datas, one of the transient state travelling wave data only after failure, but the transient state travelling wave data after failure are without being limited thereto.
In any of the above-described technical solution, it is preferable that judge whether the non-transformer end of line electricity source relay occurs list
The step of phase ground fault, comprising: the three-phase main-frequency voltage and three-phase main-frequency electric current at acquisition route both ends in real time；Storage is first respectively
Beginning three-phase main-frequency voltage and initial three-phase main-frequency electric current, and to initial three-phase main-frequency voltage and initial three-phase main-frequency electric current respectively into
Row Phase-Sequence Transformation obtains the virtual value of power frequency residual voltage and the virtual value of three-phase main-frequency electric current；Comparing power frequency residual voltage has
Valid value and voltage setting valve determine line electricity source relay if power frequency residual voltage virtual value is greater than voltage setting valve
Ground fault occurs for non-transformer end；When the non-transformer end generation ground fault for determining line electricity source relay, compare three-phase work
The virtual value and current setting of frequency electric current, if to be below electric current whole for the virtual value of each phase power current in three-phase main-frequency electric current
Definite value then determines that singlephase earth fault occurs for the non-transformer end of line electricity source relay.
After ground fault occurs for power circuit, significant change is had occurred in the stable state power frequency quality after failure compared with before failure
Change.Before failure, three-phase symmetrical, wherein three-phase voltage is symmetrical, maintains near voltage rating；Three-phase current is load current, nothing
Significant residual voltage and zero-sequence current.After failure, significant changes will occur in voltage and current.In system with non effectively earth ed neutral,
After singlephase earth fault, residual voltage is increased, and perfects the raising of phase phase voltage, the short trouble in addition to single-phase earthing, failure phase
Electric current increases, and faulted phase voltage reduces.
In the technical scheme, if monitoring, traveling wave disturbance is had occurred in line electricity source relay non-transformer end, and storage is real
When the initial three-phase main-frequency voltage and initial three-phase main-frequency electric current that acquire, such as 24 point datas after disturbing.To three-phase main-frequency voltage and
Three-phase main-frequency electric current carries out Phase-Sequence Transformation respectively, obtains positive and negative, 03 order components of three-phase main-frequency voltage, recycles Fourier
The virtual value of power frequency residual voltage and the virtual value of three-phase main-frequency electric current are sought in transformation respectively.By comparing residual voltage virtual value
Determine that the non-transformer end of relay is connect if residual voltage virtual value is greater than voltage setting valve with voltage setting valve
Earth fault；And then compare three-phase current virtual value and current setting, if three-phase current virtual value is below current setting,
Then determine that singlephase earth fault has occurred in the non-transformer end of relay.
It should be appreciated by those skilled in the art that 24 points after the three-phase main-frequency voltage and three-phase main-frequency current disturbing that acquire in real time
Data, one of stable state power frequency data only after failure, but the stable state power frequency data after failure are without being limited thereto.
In any of the above-described technical solution, it is preferable that voltage setting valve is equal to the residual voltage under route operates normally
The product of upper critical value and the first predetermined coefficient；Current setting be equal to route operate normally lower load current upper critical value and
The product of second predetermined coefficient.
In the technical scheme, voltage setting valve is that the maximum residual voltage width being likely to occur is operated normally down according to system
It is worth the adjusting that is multiplied with a safety factor, current setting operates normally down the maximum load current being likely to occur according to system
Be multiplied adjusting with another safety factor.
The invention also provides a kind of single-phase earthing traveling-wave protection devices, comprising: disturbance unit, for going when route
Wave disturbance, judges whether disturbance occurs the non-transformer end of line electricity source relay in the line；Trouble unit, for when judgement
Disturbance occurs to judge whether the non-transformer end of line electricity source relay occurs list at the non-transformer end of route source side relay
Phase ground fault；Protection location, for being sent out based on the time adjusted according to stepped principle when determining generation singlephase earth fault
Trip signal out；Protection location issues trip signal according to trip signal if being also used to line electricity source relay, and route is without electricity
The relay of source will issue trip signal according to the situation of change of the three-phase main-frequency electrical quantity detected.
Single-phase earthing traveling-wave protection device according to the present invention, neutral point on the road of branch power lines containing multistage is non-effective to be connect
Either branch route (i.e. the radial distribution line of the single ended power supply of single breaker disjunction) in ground system is protected based on detection
The traveling wave electric amount at route both ends judges whether disturbed on protected circuit, if being disturbed, is based on initial traveling wave
Polarity comparision, judge that disturbance occurs in relay which side, it is electrical based on power frequency if occurring at the non-transformer end of relay
Amount, judges whether relay non-transformer end has occurred singlephase earth fault, and be distinguish to failure and disturbance, if relay
Singlephase earth fault has occurred in non-transformer end, then based on the time delays waiting movement adjusted according to stepped principle, works as the time
The shortest relay of delayed setting takes the lead in after tripping, and faulty line is removed from source side, the non-transformer side relay of opposite end
Using the situation of change for the three-phase main-frequency electrical quantity experienced specifically, non-transformer side relay will detect that three-phase current has
Valid value levels off to zero, in this, as criterion, issues trip signal, cuts off from non-transformer side by faulty line.Through the invention
Single-phase earthing traveling-wave protection method can not only that accurately and quickly detect singlephase earth fault, and can be quickly selective
Power line protection successive Trip is realized from two tip cut-off singlephase earth fault of faulty line in ground, is that fast quick-recovery is normal
Line powering provides condition, improves power circuit operational reliability, and do not need communication channel, has good economy and reality
The property used.
In the above-mentioned technical solutions, it is preferable that according to stepped principle adjust time, specifically: according to relay with
Corresponding setting time is arranged in the distance of power supply, wherein distance is closer, setting time is longer.
In the technical scheme, relay is closer apart from power supply, corresponding to setting time it is longer.If system occurs
Traveling wave disturbance judges that disturbance occurs at which end of relay, if occurring to judge relay without electricity at relay non-transformer end
When whether source has occurred singlephase earth fault, if singlephase earth fault has occurred, each such relay will be according to corresponding
Setting time delay after act, after the shortest relay of being delayed issues trip signal, faulty line is removed from source side,
The non-transformer side relay of its other side utilizes the situation of change for the three-phase main-frequency electrical quantity experienced, to issue trip signal,
It is cut off from non-transformer side by faulty line.To realize power line protection successive Trip, that accurately and quickly detect
Singlephase earth fault, quickly selectively from two tip cut-off singlephase earth fault of route.
In any of the above-described technical solution, it is preferable that disturbance unit is specifically used for: the three-phase at acquisition route both ends in real time
Voltage traveling wave and three-phase current traveling wave；By the analog quantity of three-phase voltage traveling wave or the analog quantity and preset threshold of three-phase current traveling wave
It is compared, if the analog quantity of the analog quantity of three-phase voltage traveling wave or three-phase current traveling wave is greater than preset threshold, determines to occur
Traveling wave disturbance.
In the technical scheme, in real time according to three-phase electricity on preset sample frequency (such as 1Mhz) synchronous acquisition protected circuit
Press traveling wave and three-phase current traveling wave；The analog input level of real-time three-phase voltage traveling wave or three-phase current traveling wave is more electric
Road judges traveling wave disturbance whether has occurred in system compared with preset threshold.Wherein, the setting of threshold value can be 200mv.Tool
For body, when three-phase voltage traveling wave analog quantity or three-phase voltage traveling wave analog quantity are greater than preset threshold, then decision-making system occurs
Traveling wave disturbance.
It should be appreciated by those skilled in the art that sample frequency is 1Mhz, but not limited to this；Preset threshold is 200mv, but not
It is limited to this.
In any of the above-described technical solution, it is preferable that disturbance unit is specifically also used to: storing initial three-phase voltage respectively
Traveling wave and initial three-phase current traveling wave calculate the modulus of three-phase voltage traveling wave and the modulus of three-phase current traveling wave；Three are obtained respectively
The modulus of the modulus of phase voltage traveling wave and corresponding three-phase current traveling wave, by the modulus of three-phase voltage traveling wave and three-phase current traveling wave
Modulus carry out four layers of wavelet transformation respectively, corresponding wavelet transform modulus maxima is extracted according to respective wavelet transform result respectively
Value；It is popular with corresponding three-phase electricity to the wavelet modulus maxima of the modulus of each layer of three-phase voltage traveling wave in four layers respectively
The wavelet modulus maxima of the modulus of wave carries out Polarity comparision；If there is the small echo of the modulus of at least three layers of three-phase voltage traveling wave
The polarity of transformation modulus maximum is with the polarity of the wavelet modulus maxima of the modulus of corresponding three-phase current traveling wave on the contrary, then sentencing
Fixed disturbance occurs at the non-transformer end of route source side relay.
In any of the above-described technical solution, it is preferable that the modulus of three-phase voltage traveling wave includes three-phase voltage traveling wave line mould point
Amount and/or three-phase voltage traveling wave zero _exit, the modulus of three-phase current traveling wave include three-phase current traveling wave Aerial mode component and/or three
Phase current traveling wave zero _exit.
In the technical scheme, if monitoring that traveling wave disturbance, the modulus to three-phase voltage traveling wave and three have occurred in system
The modulus of phase current traveling wave carries out four layers of wavelet transformation respectively, and the primary of cubic B-spline function can be selected in wavelet function herein
Derived function.Corresponding modulus maximum is extracted according to respective wavelet transform result.It is small by comparing four layers of modulus of voltage traveling wave
The polarity of wave conversion modulus maximum and four layers of wavelet modulus maxima of modulus of corresponding current traveling wave, whether to judge disturbance
Occur at the non-transformer end of relay.
Specifically, if monitoring that traveling wave disturbance, storing initial three-phase voltage traveling wave and initial three-phase have occurred in system
Current traveling wave, each 64 point data such as before and after disturbance.Phase-model transformation is carried out to three-phase voltage traveling wave, phase mode transformation matrix are using triumphant
Human relations Bell's matrix, to obtain three-phase voltage traveling wave Aerial mode component and three-phase voltage traveling wave zero _exit.Similarly, to three-phase current
Traveling wave carries out phase-model transformation, and transformation matrix uses triumphant human relations Bell matrix, to obtain three-phase current traveling wave Aerial mode component and three-phase
Current traveling wave zero _exit.
Four layers of wavelet modulus maxima of comparison voltage traveling wave Aerial mode component with four layers of corresponding current traveling wave Aerial mode component
The polarity of wavelet modulus maxima, if there is being no less than three layers of voltage traveling wave Aerial mode component and corresponding current traveling wave line mould
The wavelet modulus maxima polarity of component is on the contrary, then determine that disturbance occurs at relay non-transformer end；Alternatively, comparison voltage row
Four layers of wavelet modulus maxima of wave zero _exit and four layers of wavelet modulus maxima of corresponding current traveling wave zero _exit
Polarity, if there is being no less than three layers of voltage traveling wave zero _exit and the wavelet modulus maxima pole of current traveling wave zero _exit
Property on the contrary, then determine disturbance occur at relay non-transformer end；If above-mentioned be all unsatisfactory for, determine that disturbance occurs by protective wire
Other than road.According to the technical solution of the present invention, singlephase earth fault and disturbance can be distinguish, so as to avoid related skill
The traveling wave and system disturbance for being difficult to differentiate between failure generation in art are easy to malfunction as lightning stroke even switch operates the traveling wave generated
Problem.
It should be appreciated by those skilled in the art that three-phase voltage traveling wave and three-phase current traveling wave the disturbance front and back acquired in real time is each
64 point datas, one of the transient state travelling wave data only after failure, but the transient state travelling wave data after failure are without being limited thereto.
In any of the above-described technical solution, it is preferable that trouble unit is specifically used for: the three-phase at acquisition route both ends in real time
Power-frequency voltage and three-phase main-frequency electric current；Storing initial three-phase main-frequency voltage and initial three-phase main-frequency electric current respectively, and to initial three
Phase power-frequency voltage and initial three-phase main-frequency electric current carry out Phase-Sequence Transformation respectively, obtain the virtual value and three-phase work of power frequency residual voltage
The virtual value of frequency electric current；Compare three-phase main-frequency residual voltage virtual value and voltage setting valve, if power frequency residual voltage virtual value is big
In voltage setting valve, then determine that singlephase earth fault occurs for the non-transformer end of line electricity source relay；When judgement line power
Ground fault occurs for the non-transformer end of side relay, compares the virtual value and current setting of three-phase main-frequency electric current, if three-phase work
The virtual value of each phase power current is below current setting in frequency electric current, then determines the non-transformer of line electricity source relay
Singlephase earth fault occurs for end.
After ground fault occurs for power circuit, significant change is had occurred in the stable state power frequency quality after failure compared with before failure
Change.Before failure, three-phase symmetrical, wherein three-phase voltage is symmetrical, maintains near voltage rating；Three-phase current is load current, nothing
Residual voltage and zero-sequence current.After failure, significant changes will occur in voltage and current.It is single-phase in system with non effectively earth ed neutral
After ground fault, residual voltage is increased, and perfects the raising of phase phase voltage, the short trouble in addition to single-phase earthing, faulted phase current
It increases, faulted phase voltage reduces.
In the technical scheme, if monitoring, traveling wave disturbance is had occurred in relay non-transformer end, and storage acquires first in real time
Beginning three-phase main-frequency voltage and initial three-phase main-frequency electric current, such as 24 point datas after disturbing.To three-phase main-frequency voltage and three-phase main-frequency electricity
Stream carries out Phase-Sequence Transformation respectively, obtains positive and negative, 03 order components of three-phase main-frequency voltage respectively, recycles Fourier transformation point
The virtual value of power frequency residual voltage and the virtual value of three-phase main-frequency electric current are not sought.By comparing residual voltage virtual value and voltage
Setting valve determines that ground fault has occurred in the non-transformer end of relay if residual voltage virtual value is greater than voltage setting valve；
And then compare three-phase current virtual value and current setting, if three-phase current virtual value is below current setting, determine
Singlephase earth fault has occurred in the non-transformer end of relay.
It should be appreciated by those skilled in the art that 24 points after the three-phase main-frequency voltage and three-phase main-frequency current disturbing that acquire in real time
Data, one of stable state power frequency data only after failure, but the stable state power frequency data after failure are without being limited thereto.
In any of the above-described technical solution, it is preferable that voltage setting valve is equal to the residual voltage under route operates normally
The product of upper critical value and the first predetermined coefficient；Current setting be equal to route operate normally lower load current upper critical value and
The product of second predetermined coefficient.
In the technical scheme, voltage setting valve is that the maximum residual voltage width being likely to occur is operated normally down according to system
It is worth the adjusting that is multiplied with a safety factor, current setting operates normally down the maximum load current being likely to occur according to system
Be multiplied adjusting with another safety factor.
The third aspect of the present invention, proposes a kind of computer equipment, including memory, processor and is stored in memory
Computer program that is upper and can running on a processor, processor are used to execute the step such as Arbitrary Term method in above-mentioned technical proposal
Suddenly.
Computer equipment according to the present invention, the processor for being included is for executing as single in any of the above-described technical solution
Mutually the step of ground connection traveling-wave protection method, thus the computer equipment can be realized the whole of the single-phase earthing traveling-wave protection method
Beneficial effect, details are not described herein.
The fourth aspect of the present invention proposes a kind of computer readable storage medium, is stored thereon with computer program, meter
Calculation machine program is realized when being executed by processor as in above-mentioned technical proposal the step of Arbitrary Term method.
Computer readable storage medium according to the present invention, the realization when computer program stored thereon is executed by processor
As in any of the above-described technical solution the step of single-phase earthing traveling-wave protection method, thus the computer readable storage medium can
Realize whole beneficial effects of the single-phase earthing traveling-wave protection method, details are not described herein.
Additional aspect and advantage of the invention will become obviously in following description section, or practice through the invention
Recognize.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 shows the flow diagram of single-phase earthing traveling-wave protection method according to an embodiment of the invention；
Fig. 2 shows the flow diagrams of single-phase earthing traveling-wave protection method according to another embodiment of the invention；
Fig. 3 shows the flow diagram of the single-phase earthing traveling-wave protection method of still another embodiment in accordance with the present invention；
Fig. 4 shows the flow diagram of single-phase earthing traveling-wave protection method according to still another embodiment of the invention；
Fig. 5 shows the flow diagram of single-phase earthing traveling-wave protection method according to still another embodiment of the invention；
Fig. 6 shows the schematic block diagram of single-phase earthing traveling-wave protection device according to an embodiment of the invention；
Fig. 7 shows the schematic block diagram of computer equipment according to an embodiment of the invention.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
As shown in Figure 1, the flow diagram of single-phase earthing traveling-wave protection method according to an embodiment of the invention.Its
In, this method comprises:
Step 102, it is disturbed when traveling wave occurs for route, judges whether disturbance occurs in route source side relay non-transformer
End；
Step 104, when determining to disturb generation at the non-transformer end of route source side relay, judge line electricity source relay
Whether device non-transformer end occurs singlephase earth fault；
Step 106, when determining generation singlephase earth fault, tripping letter is issued based on the time adjusted according to stepped principle
Number；
Step 108, if line electricity source relay according to trip signal issue trip signal, the route non-transformer side after
Electric appliance will issue trip signal according to the situation of change of the three-phase main-frequency electrical quantity detected.
Single-phase earthing traveling-wave protection method provided by the invention, neutral point on the road of branch power lines containing multistage is non-effective to be connect
Either branch route (i.e. the radial distribution line of the single ended power supply of single breaker disjunction) in ground system is protected based on detection
The traveling wave electric amount at route both ends judges whether disturbed on protected circuit, if being disturbed, is based on initial traveling wave
Polarity comparision, judge that disturbance occurs in relay which side, it is electrical based on power frequency if occurring at the non-transformer end of relay
Amount, judges whether relay non-transformer end has occurred singlephase earth fault, and be distinguish to failure and disturbance, if relay
Singlephase earth fault has occurred in non-transformer end, then based on the time delays waiting movement adjusted according to stepped principle, works as the time
The shortest relay of delayed setting takes the lead in after tripping, and faulty line is removed from source side, the non-transformer side relay of opposite end
Using the situation of change for the three-phase main-frequency electrical quantity experienced specifically, non-transformer side relay will detect that three-phase current has
Valid value levels off to zero, in this, as criterion, issues trip signal, cuts off from non-transformer side by faulty line.Through the invention
Single-phase earthing traveling-wave protection method can not only that accurately and quickly detect singlephase earth fault, and can be quickly selective
Power line protection successive Trip is realized from two tip cut-off singlephase earth fault of faulty line in ground, is that fast quick-recovery is normal
Line powering provides condition, improves power circuit operational reliability, and do not need communication channel, has good economy and reality
The property used.
Traveling wave in the embodiment of the present invention refer to running power equipment due to caused by being disturbed in power train
The electromagnetic wave propagated in system.
In the above embodiment, it is preferable that according to the time that stepped principle is adjusted, specifically: according to relay and electricity
Corresponding setting time is arranged in the distance in source, wherein distance is closer, setting time is longer.
In this embodiment, relay is closer apart from power supply, corresponding to setting time it is longer.If system has occurred
Traveling wave disturbance judges that disturbance occurs at which end of relay, if occurring to judge relay non-transformer at relay non-transformer end
When whether end has occurred singlephase earth fault, if singlephase earth fault has occurred, each such relay will be according to corresponding
It acting after setting time delay, after the shortest relay that is delayed issues trip signal, faulty line is removed from source side,
The non-transformer side relay of the other side utilizes the situation of change for the three-phase main-frequency electrical quantity experienced, to issue trip signal, from
Non-transformer side cuts off faulty line.To realize power line protection successive Trip, list is that accurately and quickly detected
Phase ground fault, quickly selectively from two tip cut-off singlephase earth fault of route.
As shown in Fig. 2, the flow diagram of single-phase earthing traveling-wave protection method according to another embodiment of the invention.
Wherein, this method comprises:
Step 202, the three-phase voltage traveling wave and three-phase current traveling wave at route both ends are acquired in real time；
Step 204, the analog quantity of the analog quantity of three-phase voltage traveling wave or three-phase current traveling wave and preset threshold are compared
Compared with；
Step 206, if the analog quantity of the analog quantity of three-phase voltage traveling wave or three-phase current traveling wave is greater than preset threshold, sentence
Surely traveling wave disturbance occurs；
Step 208, judge whether disturbance occurs at the non-transformer end of route source side relay；
Step 210, when determining to disturb generation at the non-transformer end of route source side relay, judge line electricity source relay
Whether the non-transformer end of device occurs singlephase earth fault；
Step 212, when determining generation singlephase earth fault, tripping letter is issued based on the time adjusted according to stepped principle
Number；
Step 214, if relay issues trip signal according to trip signal, the relay of the route non-transformer side will root
According to the situation of change of the three-phase main-frequency electrical quantity detected, trip signal is issued.
In this embodiment, in real time according to three-phase voltage on preset sample frequency (such as 1Mhz) synchronous acquisition protected circuit
Traveling wave and three-phase current traveling wave；By real-time three-phase voltage traveling wave or the analog input level comparison circuit of three-phase current traveling wave,
Compared with preset threshold, judge traveling wave disturbance whether has occurred in system.Wherein, the setting of threshold value can be 200mv.It is specific and
Speech, when three-phase voltage traveling wave analog quantity or three-phase voltage traveling wave analog quantity are greater than preset threshold, then traveling wave occurs for decision-making system
Disturbance.
It should be appreciated by those skilled in the art that sample frequency is 1Mhz, but not limited to this；Preset threshold is 200mv, but not
It is limited to this.
As shown in figure 3, the flow diagram of the single-phase earthing traveling-wave protection method of still another embodiment in accordance with the present invention.
Wherein, this method comprises:
Step 302, the three-phase voltage traveling wave and three-phase current traveling wave at route both ends are acquired in real time；
Step 304, the analog quantity of the analog quantity of three-phase voltage traveling wave or three-phase current traveling wave and preset threshold are compared
Compared with；
Step 306, if the analog quantity of the analog quantity of three-phase voltage traveling wave or three-phase current traveling wave is greater than preset threshold, sentence
Surely traveling wave disturbance occurs；
Step 308, difference storing initial three-phase voltage traveling wave and initial three-phase current traveling wave calculate three-phase voltage traveling wave
The modulus of modulus and three-phase current traveling wave；
Step 310, the modulus of the modulus of three-phase voltage traveling wave and three-phase current traveling wave is carried out to four layers of wavelet transformation respectively,
Corresponding wavelet modulus maxima is extracted according to respective wavelet transform result respectively；
Step 312, respectively to the wavelet modulus maxima of the modulus of each layer of three-phase voltage traveling wave in four layers with it is right
The wavelet modulus maxima of the modulus for the three-phase current traveling wave answered carries out Polarity comparision；
Step 314, if having the polarity of the wavelet modulus maxima of the modulus of at least three layers of three-phase voltage traveling wave with it is right
The polarity of the wavelet modulus maxima of the modulus for the three-phase current traveling wave answered is on the contrary, then determine that the nothing in relay occurs for disturbance
Power end；
Step 316, when determining to disturb generation at the non-transformer end of relay, judge the non-transformer of line electricity source relay
Whether end occurs singlephase earth fault；
Step 318, when singlephase earth fault occurs for judgement, based on the time sending tripping letter adjusted according to stepped principle
Number；
Step 320, if relay issues trip signal according to trip signal, the relay of the route non-transformer side will root
According to the situation of change of the three-phase main-frequency electrical quantity detected, trip signal is issued.
In any of the above-described embodiment, it is preferable that the modulus of three-phase voltage traveling wave includes three-phase voltage traveling wave Aerial mode component
And/or three-phase voltage traveling wave zero _exit, the modulus of three-phase current traveling wave include three-phase current traveling wave Aerial mode component and/or three-phase
Current traveling wave zero _exit.
In this embodiment, if monitoring that traveling wave disturbance has occurred in system, to the modulus and three-phase of three-phase voltage traveling wave
The modulus of current traveling wave carries out four layers of wavelet transformation respectively, and once leading for cubic B-spline function can be selected in wavelet function herein
Function.Corresponding modulus maximum is extracted according to respective wavelet transform result.By comparing four layers of small echo of modulus of voltage traveling wave
The polarity of modulus maximum and four layers of wavelet modulus maxima of modulus of corresponding current traveling wave is converted, to judge whether disturbance is sent out
Life is at the non-transformer end of route source side relay.
Specifically, if monitoring that traveling wave disturbance, storing initial three-phase voltage traveling wave and initial three-phase have occurred in system
Current traveling wave, each 64 point data such as before and after disturbance.Phase-model transformation is carried out to three-phase voltage traveling wave, phase mode transformation matrix are using triumphant
Human relations Bell's matrix, to obtain three-phase voltage traveling wave Aerial mode component and three-phase voltage traveling wave zero _exit.Similarly, to three-phase current
Traveling wave carries out phase-model transformation, and transformation matrix uses triumphant human relations Bell matrix, to obtain three-phase current traveling wave Aerial mode component and three-phase
Current traveling wave zero _exit.
Four layers of wavelet modulus maxima of comparison voltage traveling wave Aerial mode component with four layers of corresponding current traveling wave Aerial mode component
The polarity of wavelet modulus maxima, if there is being no less than three layers of voltage traveling wave Aerial mode component and corresponding current traveling wave line mould
The wavelet modulus maxima polarity of component is on the contrary, then determine that disturbance occurs at relay non-transformer end；Alternatively, comparison voltage row
Four layers of wavelet modulus maxima of wave zero _exit and four layers of wavelet modulus maxima of corresponding current traveling wave zero _exit
Polarity, if there is being no less than three layers of voltage traveling wave zero _exit and the wavelet modulus maxima pole of current traveling wave zero _exit
Property on the contrary, then determine disturbance occur at relay non-transformer end；If above-mentioned be all unsatisfactory for, determine that disturbance occurs by protective wire
Other than road.Embodiment through the invention can be distinguish singlephase earth fault and disturbance, so as to avoid the relevant technologies
In be difficult to differentiate between failure generation traveling wave and system disturbance as lightning stroke even switch operation generate traveling wave and be easy to asking for malfunction
Topic.
It should be appreciated by those skilled in the art that three-phase voltage traveling wave and three-phase current traveling wave the disturbance front and back acquired in real time is each
64 point datas, one of the transient state travelling wave data only after failure, but the transient state travelling wave data after failure are without being limited thereto.
As shown in figure 4, the flow diagram of single-phase earthing traveling-wave protection method according to still another embodiment of the invention.
Wherein, this method comprises:
Step 402, the three-phase voltage traveling wave and three-phase current traveling wave and three-phase main-frequency voltage at real-time acquisition route both ends
With three-phase main-frequency electric current；
Step 404, the analog quantity of the analog quantity of three-phase voltage traveling wave or three-phase current traveling wave and preset threshold are compared
Compared with；
Step 406, if the analog quantity of the analog quantity of three-phase voltage traveling wave or three-phase current traveling wave is greater than preset threshold, sentence
Determine system and traveling wave disturbance occurs；
Step 408, difference storing initial three-phase voltage traveling wave and initial three-phase current traveling wave calculate three-phase voltage traveling wave
The modulus of modulus and three-phase current traveling wave；
Step 410, the modulus of the modulus of three-phase voltage traveling wave and three-phase current traveling wave is carried out to four layers of wavelet transformation respectively,
Corresponding wavelet modulus maxima is extracted according to respective wavelet transform result respectively；
Step 412, respectively to the wavelet modulus maxima of the modulus of each layer of three-phase voltage traveling wave in four layers with it is right
The wavelet modulus maxima of the modulus for the three-phase current traveling wave answered carries out Polarity comparision；
Step 414, if having the polarity of the wavelet modulus maxima of the modulus of at least three layers of three-phase voltage traveling wave with it is right
The polarity of the wavelet modulus maxima of the modulus for the three-phase current traveling wave answered is on the contrary, then determine that disturbance occurs in route source side
The non-transformer end of relay；
Step 416, difference storing initial three-phase main-frequency voltage and initial three-phase main-frequency electric current, and to initial three-phase main-frequency electricity
Pressure and initial three-phase main-frequency electric current carry out Phase-Sequence Transformation respectively, obtain the virtual value and three-phase main-frequency electric current of power frequency residual voltage
Virtual value；
Step 418, compare power frequency residual voltage virtual value and voltage setting valve, if power frequency residual voltage virtual value is greater than electricity
Repoussage definite value then determines that ground fault occurs for the non-transformer end of line electricity source relay；
Step 420, compare the virtual value and current setting of three-phase main-frequency electric current, if each phase work in three-phase main-frequency electric current
The virtual value of frequency electric current is below current setting, then determines that single-phase earthing event occurs for the non-transformer end of line electricity source relay
Barrier；
Step 422, trip signal is issued based on the time adjusted according to stepped principle；
Step 424, if line electricity source relay issues trip signal, the relay of route non-transformer side according to trip signal
Device will issue trip signal according to the situation of change of the three-phase main-frequency electrical quantity detected.
In this embodiment, if monitoring, traveling wave disturbance is had occurred in relay non-transformer end, and storage acquires initial in real time
Three-phase main-frequency voltage and initial three-phase main-frequency electric current, such as 24 point datas after disturbing.To three-phase main-frequency voltage and three-phase main-frequency electric current
Phase-Sequence Transformation is carried out respectively, obtains positive and negative, 03 order components of three-phase main-frequency voltage, and Fourier transformation is recycled to seek respectively
The virtual value of power frequency residual voltage and the virtual value of three-phase main-frequency electric current.It is adjusted by comparing residual voltage virtual value and voltage
Value determines that ground fault has occurred in the non-transformer end of relay if residual voltage virtual value is greater than voltage setting valve；In turn
Compare three-phase current virtual value and current setting, if three-phase current virtual value is below current setting, determines relay
Singlephase earth fault has occurred in the non-transformer end of device.
It should be appreciated by those skilled in the art that 24 points after the three-phase main-frequency voltage and three-phase main-frequency current disturbing that acquire in real time
Data, one of stable state power frequency data only after failure, but the stable state power frequency data after failure are without being limited thereto.
In any of the above-described embodiment, it is preferable that voltage setting valve is equal to the upper of the residual voltage under route operates normally
The product of critical value and the first predetermined coefficient；Current setting is equal to the upper critical value and that route operates normally lower load current
The product of two predetermined coefficients.
In this embodiment, voltage setting valve is that the maximum residual voltage amplitude being likely to occur is operated normally down according to system
Be multiplied adjusting with a safety factor, current setting operated normally down according to system the maximum load current that is likely to occur with
The multiplication adjusting of another safety factor.
Specific embodiment: providing a kind of power circuit single-phase ground protection method of system with non effectively earth ed neutral,
As shown in figure 5, this method specifically includes:
Step 502, protected circuit both ends traveling wave electric amount and power frequency quality are acquired in real time；
Step 504, it is based on traveling wave electric amount, judges traveling wave disturbance whether has occurred in system；
Step 506, when traveling wave disturbance has occurred in decision-making system, it is based on the judgement disturbance of initial voltage current traveling wave polarity
No generation is at route source side relay non-transformer end；
Step 508, when determining to disturb generation at non-transformer end, it is based on power frequency quality, judges line electricity source relay
Whether non-transformer end has occurred singlephase earth fault；
Step 510, when singlephase earth fault has occurred in judgement, line electricity source relay is first, in accordance with step type cooperation
Time delays waiting movement；
Step 512, after the shortest actuating of relay that is delayed is tripped, the line electricity source relay of opposite end utilizes impression
To three-phase main-frequency electrical quantity variation come operational relay movement.
Single-phase earthing traveling-wave protection method provided in an embodiment of the present invention, the neutral point on the road of branch power lines containing multistage are non-
Either branch route (i.e. the distribution line of single breaker disjunction) in effectively earthed system, based on detection protected circuit both ends
Traveling wave electric amount, judge whether disturbed on protected circuit, if being disturbed, the polarity ratio based on initial traveling wave
Compared with, judge that disturbance occurs in relay which side, if occurring to be based on power frequency quality at the non-transformer end of relay, judge after
Whether electric appliance non-transformer end has occurred singlephase earth fault, and is distinguish to failure and disturbance, if relay non-transformer end
Singlephase earth fault has occurred, then based on the time delays waiting movement adjusted according to stepped principle, when time delayed setting
Shorter relay takes the lead in after tripping, and the non-transformer side relay of faulty line opposite end utilizes the three-phase main-frequency electrical quantity experienced
Situation of change, to issue trip signal.Single-phase earthing traveling-wave protection method through the invention, can not only be accurate and quick
Ground detects singlephase earth fault, and can realize electricity quickly selectively from two tip cut-off singlephase earth fault of faulty line
Power route protection successive Trip provides condition for the power supply of fast quick-recovery regular link, improves power circuit operational reliability,
And communication channel is not needed, there is good economy and practicability.
As shown in fig. 6, the schematic block diagram of single-phase earthing traveling-wave protection device according to an embodiment of the invention.Its
In, which includes:
Unit 602 is disturbed, for traveling wave disturbance to occur when route, judges whether disturbance occurs in route source side relay
Non-transformer end；
Trouble unit 604, for judging line electricity when determining to disturb generation at the non-transformer end of route source side relay
Whether the non-transformer end of source relay occurs singlephase earth fault；
Protection location 606, for being sent out based on the time adjusted according to stepped principle when determining generation singlephase earth fault
Trip signal out；
Protection location 606 issues trip signal according to trip signal if being also used to line electricity source relay, and route is without electricity
The relay of source will issue trip signal according to the situation of change of the three-phase main-frequency electrical quantity detected.
Single-phase earthing traveling-wave protection device 600 provided by the invention, neutral point on the road of branch power lines containing multistage is non-to be had
The either branch route (i.e. the radial distribution line of the single ended power supply of single breaker disjunction) in earthed system is imitated, based on detection quilt
The traveling wave electric amount at protection circuit both ends judges whether disturbed on protected circuit, if being disturbed, based on initial
The Polarity comparision of traveling wave judges that disturbance occurs in relay which side, if occurring to be based on power frequency electric at the non-transformer end of relay
Tolerance, judges whether relay non-transformer end has occurred singlephase earth fault, and is distinguish to failure and disturbance, if relay
Singlephase earth fault has occurred in device non-transformer end, then based on the time delays waiting movement adjusted according to stepped principle, at that time
Between the shortest relay of delayed setting take the lead in after tripping, faulty line is removed from source side, the non-transformer side relay of opposite end
Device is using the situation of change for the three-phase main-frequency electrical quantity experienced specifically, non-transformer side relay will detect that three-phase current
Virtual value levels off to zero, in this, as criterion, issues trip signal, cuts off from non-transformer side by faulty line.Through the invention
Single-phase earthing traveling-wave protection method, can not only that accurately and quickly detect singlephase earth fault, and can quickly have selection
Property from two tip cut-off singlephase earth fault of faulty line, realize power line protection successive Trip, be fast quick-recovery just
Normal line powering provides condition, improves power circuit operational reliability, and do not need communication channel, have good economy and
Practicability.
In the above embodiment, it is preferable that according to the time that stepped principle is adjusted, specifically: according to relay and electricity
Corresponding setting time is arranged in the distance in source, wherein distance is closer, setting time is longer.
In this embodiment, relay is closer apart from power supply, corresponding to setting time it is longer.If system has occurred
Traveling wave disturbance judges that disturbance occurs at which end of relay, if occurring to judge relay non-transformer at relay non-transformer end
When whether end has occurred singlephase earth fault, if singlephase earth fault has occurred, each such relay will be according to corresponding
It acting after setting time delay, after the shortest relay that is delayed issues trip signal, faulty line is removed from source side,
The non-transformer side relay of the other side utilizes the situation of change for the three-phase main-frequency electrical quantity experienced, to issue trip signal, from
Non-transformer side cuts off faulty line.To realize power line protection successive Trip, list is that accurately and quickly detected
Phase ground fault, quickly selectively from two tip cut-off singlephase earth fault of route.
In any of the above-described embodiment, it is preferable that disturbance unit 602 is specifically used for: the three-phase at acquisition route both ends in real time
Voltage traveling wave and three-phase current traveling wave；By the analog quantity of three-phase voltage traveling wave or the analog quantity and preset threshold of three-phase current traveling wave
It is compared, if the analog quantity of the analog quantity of three-phase voltage traveling wave or three-phase current traveling wave is greater than preset threshold, determines to occur
Traveling wave disturbance.
In this embodiment, in real time according to three-phase voltage on preset sample frequency (such as 1Mhz) synchronous acquisition protected circuit
Traveling wave and three-phase current traveling wave；By real-time three-phase voltage traveling wave or the analog input level comparison circuit of three-phase current traveling wave,
Compared with preset threshold, judge traveling wave disturbance whether has occurred in system.Wherein, the setting of threshold value can be 200mv.It is specific and
Speech, when three-phase voltage traveling wave analog quantity or three-phase voltage traveling wave analog quantity are greater than preset threshold, then traveling wave occurs for decision-making system
Disturbance.
It should be appreciated by those skilled in the art that sample frequency is 1Mhz, but not limited to this；Preset threshold is 200mv, but not
It is limited to this.
In any of the above-described embodiment, it is preferable that disturbance unit 602 is specifically also used to: storing initial three-phase voltage respectively
Traveling wave and initial three-phase current traveling wave calculate the modulus of three-phase voltage traveling wave and the modulus of three-phase current traveling wave；Three are obtained respectively
The modulus of the modulus of phase voltage traveling wave and corresponding three-phase current traveling wave, by the modulus of three-phase voltage traveling wave and three-phase current traveling wave
Modulus carry out four layers of wavelet transformation respectively, corresponding wavelet transform modulus maxima is extracted according to respective wavelet transform result respectively
Value；It is popular with corresponding three-phase electricity to the wavelet modulus maxima of the modulus of each layer of three-phase voltage traveling wave in four layers respectively
The wavelet modulus maxima of the modulus of wave carries out Polarity comparision；If there is the small echo of the modulus of at least three layers of three-phase voltage traveling wave
The polarity of transformation modulus maximum is with the polarity of the wavelet modulus maxima of the modulus of corresponding three-phase current traveling wave on the contrary, then sentencing
Fixed disturbance occurs at the non-transformer end of route source side relay.
In any of the above-described embodiment, it is preferable that the modulus of three-phase voltage traveling wave includes three-phase voltage traveling wave Aerial mode component
And/or three-phase voltage traveling wave zero _exit, the modulus of three-phase current traveling wave include three-phase current traveling wave Aerial mode component and/or three-phase
Current traveling wave zero _exit.
In this embodiment, if monitoring that traveling wave disturbance has occurred in system, to the modulus and three-phase of three-phase voltage traveling wave
The modulus of current traveling wave carries out four layers of wavelet transformation respectively, and once leading for cubic B-spline function can be selected in wavelet function herein
Function.Corresponding modulus maximum is extracted according to respective wavelet transform result.By comparing four layers of small echo of modulus of voltage traveling wave
The polarity of modulus maximum and four layers of wavelet modulus maxima of modulus of corresponding current traveling wave is converted, to judge whether disturbance is sent out
Life is at the non-transformer end of relay.
Specifically, if monitoring that traveling wave disturbance, storing initial three-phase voltage traveling wave and initial three-phase have occurred in system
Current traveling wave, each 64 point data such as before and after disturbance.Phase-model transformation is carried out to three-phase voltage traveling wave, phase mode transformation matrix are using triumphant
Human relations Bell's matrix, to obtain three-phase voltage traveling wave Aerial mode component and three-phase voltage traveling wave zero _exit.Similarly, to three-phase current
Traveling wave carries out phase-model transformation, and transformation matrix uses triumphant human relations Bell matrix, to obtain three-phase current traveling wave Aerial mode component and three-phase
Current traveling wave zero _exit.
Four layers of wavelet modulus maxima of comparison voltage traveling wave Aerial mode component with four layers of corresponding current traveling wave Aerial mode component
The polarity of wavelet modulus maxima, if there is being no less than three layers of voltage traveling wave Aerial mode component and corresponding current traveling wave line mould
The wavelet modulus maxima polarity of component is on the contrary, then determine that disturbance occurs at relay non-transformer end；Alternatively, comparison voltage row
Four layers of wavelet modulus maxima of wave zero _exit and four layers of wavelet modulus maxima of corresponding current traveling wave zero _exit
Polarity, if there is being no less than three layers of voltage traveling wave zero _exit and the wavelet modulus maxima pole of current traveling wave zero _exit
Property on the contrary, then determine disturbance occur at relay non-transformer end；If above-mentioned be all unsatisfactory for, determine that disturbance occurs by protective wire
Other than road.Embodiment through the invention can be distinguish singlephase earth fault and disturbance, so as to avoid the relevant technologies
In be difficult to differentiate between failure generation traveling wave and system disturbance as lightning stroke even switch operation generate traveling wave and be easy to asking for malfunction
Topic.
It should be appreciated by those skilled in the art that three-phase voltage traveling wave and three-phase current traveling wave the disturbance front and back acquired in real time is each
64 point datas, one of the transient state travelling wave data only after failure, but the transient state travelling wave data after failure are without being limited thereto.
In any of the above-described embodiment, it is preferable that trouble unit 604 is specifically used for: the three-phase at acquisition route both ends in real time
Power-frequency voltage and three-phase main-frequency electric current；Storing initial three-phase main-frequency voltage and initial three-phase main-frequency electric current respectively, and to initial three
Phase power-frequency voltage and initial three-phase main-frequency electric current carry out Phase-Sequence Transformation respectively, obtain the virtual value and three-phase work of power frequency residual voltage
The virtual value of frequency electric current；Compare three-phase main-frequency residual voltage virtual value and voltage setting valve, if power frequency residual voltage virtual value is big
In voltage setting valve, then determine that singlephase earth fault occurs for the non-transformer end of line electricity source relay；When judgement line power
Ground fault occurs for the non-transformer end of side relay, compares the virtual value and current setting of three-phase main-frequency electric current, if three-phase work
The virtual value of frequency electric current is below current setting, then determines that single-phase earthing event occurs for the non-transformer end of line electricity source relay
Barrier.
After ground fault occurs for power circuit, significant change is had occurred in the stable state power frequency quality after failure compared with before failure
Change.Before failure, three-phase symmetrical, wherein three-phase voltage is symmetrical, maintains near voltage rating；Three-phase current is load current, nothing
Residual voltage and zero-sequence current.After failure, significant changes will occur in voltage and current.It is single-phase in system with non effectively earth ed neutral
After ground fault, residual voltage is increased, and perfects the raising of phase phase voltage, the short trouble in addition to single-phase earthing, faulted phase current
It increases, faulted phase voltage reduces.
In this embodiment, if monitoring, traveling wave disturbance is had occurred in relay non-transformer end, and storage acquires initial in real time
Three-phase main-frequency voltage and initial three-phase main-frequency electric current, such as 24 point datas after disturbing.To three-phase main-frequency voltage and three-phase main-frequency electric current
Phase-Sequence Transformation is carried out respectively, obtains positive and negative, 03 order components of three-phase main-frequency voltage respectively, recycles Fourier transformation difference
Seek the virtual value of power frequency residual voltage and the virtual value of three-phase main-frequency electric current.It is whole by comparing residual voltage virtual value and voltage
Definite value determines that ground fault has occurred in the non-transformer end of relay if residual voltage virtual value is greater than voltage setting valve；Into
And compare three-phase current virtual value and current setting, if three-phase current virtual value is below current setting, determine after
Singlephase earth fault has occurred in the non-transformer end of electric appliance.
It should be appreciated by those skilled in the art that 24 points after the three-phase main-frequency voltage and three-phase main-frequency current disturbing that acquire in real time
Data, one of stable state power frequency data only after failure, but the stable state power frequency data after failure are without being limited thereto.
In any of the above-described embodiment, it is preferable that voltage setting valve is equal to the upper of the residual voltage under route operates normally
The product of critical value and the first predetermined coefficient；Current setting is equal to the upper critical value and that route operates normally lower load current
The product of two predetermined coefficients.
In this embodiment, voltage setting valve is that the maximum residual voltage amplitude being likely to occur is operated normally down according to system
Be multiplied adjusting with a safety factor, current setting operated normally down according to system the maximum load current that is likely to occur with
The multiplication adjusting of another safety factor.
As shown in fig. 7, the schematic diagram of computer equipment according to an embodiment of the invention.The wherein computer equipment
1, including memory 12, processor 14 and it is stored in the computer program that can be run on memory 12 and on processor 14, is located
Device 14 is managed for executing such as the step of any one of above-described embodiment method.
Computer equipment 1 provided by the invention, the processor 14 for being included is for executing as in above-mentioned any embodiment
The step of single-phase earthing traveling-wave protection method, thus the computer equipment 1 can be realized the single-phase earthing traveling-wave protection method
Whole beneficial effects, details are not described herein.
The fourth aspect of the present invention embodiment proposes a kind of computer readable storage medium, is stored thereon with computer
Program is realized when computer program is executed by processor as in above-described embodiment the step of Arbitrary Term method.
Computer readable storage medium provided by the invention, the realization when computer program stored thereon is executed by processor
As in above-mentioned any embodiment the step of single-phase earthing traveling-wave protection method, thus the computer readable storage medium can be real
Now whole beneficial effects of the single-phase earthing traveling-wave protection method, details are not described herein.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (14)
1. a kind of single-phase earthing traveling-wave protection method characterized by comprising
It is disturbed when traveling wave occurs for route, judges whether disturbance occurs the non-transformer in the line midline road source side relay
End；
Occur to judge the line electricity source relay at the non-transformer end of the line electricity source relay when determining to disturb
Whether non-transformer end occurs singlephase earth fault；
When determining that singlephase earth fault occurs, trip signal is issued based on the time adjusted according to stepped principle；
If the line electricity source relay issues trip signal according to the trip signal, the relay of route non-transformer side will
Trip signal can be issued according to the situation of change of the three-phase main-frequency electrical quantity detected；
The time adjusted according to stepped principle, specifically:
According to the line electricity source relay, corresponding setting time is set at a distance from power supply, wherein the distance is closer,
The setting time is longer.
2. single-phase earthing traveling-wave protection method according to claim 1, which is characterized in that the method also includes:
The three-phase voltage traveling wave and three-phase current traveling wave at the route both ends are acquired in real time；
The analog quantity of the analog quantity of the three-phase voltage traveling wave or the three-phase current traveling wave is compared with preset threshold, if
The analog quantity of the analog quantity of the three-phase voltage traveling wave or the three-phase current traveling wave is greater than the preset threshold, then determines to occur
Traveling wave disturbance.
3. single-phase earthing traveling-wave protection method according to claim 1, which is characterized in that described to judge whether disturbance occurs
The non-transformer end of the line midline road source side relay the step of, comprising:
Storing initial three-phase voltage traveling wave and initial three-phase current traveling wave respectively, calculate modulus and the institute of the three-phase voltage traveling wave
State the modulus of three-phase current traveling wave；
The modulus of the modulus of the three-phase voltage traveling wave and the three-phase current traveling wave is carried out to four layers of wavelet transformation respectively, respectively
Corresponding wavelet modulus maxima is extracted according to respective wavelet transform result；
Respectively to the wavelet modulus maxima with corresponding three-phase current of the modulus of each layer of three-phase voltage traveling wave in four layers
The wavelet modulus maxima of the modulus of traveling wave carries out Polarity comparision；
If having at least polarity of the wavelet modulus maxima of the modulus of three layers of the three-phase voltage traveling wave and corresponding three-phase
The polarity of the wavelet modulus maxima of the modulus of current traveling wave is on the contrary, then determine that disturbance occurs in the line electricity source relay
The non-transformer end of device.
4. single-phase earthing traveling-wave protection method according to claim 3, which is characterized in that
The modulus of the three-phase voltage traveling wave includes three-phase voltage traveling wave Aerial mode component and/or three-phase voltage traveling wave zero _exit；
The modulus of the three-phase current traveling wave includes three-phase current traveling wave Aerial mode component and/or three-phase current traveling wave zero _exit.
5. single-phase earthing traveling-wave protection method according to any one of claim 1 to 4, which is characterized in that the judgement
The step of whether the non-transformer end of the line electricity source relay occurs singlephase earth fault, comprising: acquire the line in real time
The three-phase main-frequency voltage and three-phase main-frequency electric current at road both ends；
Storing initial three-phase main-frequency voltage and initial three-phase main-frequency electric current respectively, and to the initial three-phase main-frequency voltage and described
Initial three-phase main-frequency electric current carries out Phase-Sequence Transformation respectively, obtain power frequency residual voltage virtual value and three-phase main-frequency electric current it is effective
Value；
Compare the power frequency residual voltage virtual value and voltage setting valve, if the power frequency residual voltage virtual value is more than or equal to institute
Voltage setting valve is stated, then determines that ground fault occurs for the non-transformer end of the line electricity source relay；
When ground fault occurs for the non-transformer end for determining the line electricity source relay, the three-phase main-frequency electric current has
Valid value and current setting, if the virtual value of each phase power current is below the current calibration in the three-phase main-frequency electric current
Value then determines that singlephase earth fault occurs for the non-transformer end of the line electricity source relay.
6. single-phase earthing traveling-wave protection method according to claim 5, which is characterized in that the method also includes:
The voltage setting valve be equal to the route operate normally lower residual voltage upper critical value and the first predetermined coefficient it
Product；
The current setting be equal to the route operate normally lower load current upper critical value and the second predetermined coefficient it
Product.
7. a kind of single-phase earthing traveling-wave protection device characterized by comprising
Disturb unit, for when route occur traveling wave disturbance, judge disturbance whether occur line midline road source side after
The non-transformer end of electric appliance；
Trouble unit, for judging the route when determining to disturb generation at the non-transformer end of the line electricity source relay
Whether the non-transformer end of source side relay occurs singlephase earth fault；
Protection location, for issuing tripping based on the time adjusted according to stepped principle when determining generation singlephase earth fault
Signal；
The protection location issues trip signal, line according to the trip signal if being also used to the line electricity source relay
The relay of road non-transformer side will issue trip signal according to the situation of change of the three-phase main-frequency electrical quantity detected；
The time adjusted according to stepped principle, specifically:
According to the line electricity source relay, corresponding setting time is set at a distance from power supply, wherein the distance is closer,
The setting time is longer.
8. single-phase earthing traveling-wave protection device according to claim 7, which is characterized in that the disturbance unit, it is specific to use
In:
The three-phase voltage traveling wave and three-phase current traveling wave at the route both ends are acquired in real time；
The analog quantity of the analog quantity of the three-phase voltage traveling wave or the three-phase current traveling wave is compared with preset threshold, if
The analog quantity of the analog quantity of the three-phase voltage traveling wave or the three-phase current traveling wave is greater than the preset threshold, then determines to occur
Traveling wave disturbance.
9. single-phase earthing traveling-wave protection device according to claim 7, which is characterized in that the disturbance unit, it is specific to go back
For:
Storing initial three-phase voltage traveling wave and initial three-phase current traveling wave respectively, calculate modulus and the institute of the three-phase voltage traveling wave
State the modulus of three-phase current traveling wave；
The modulus of the modulus of the three-phase voltage traveling wave and the three-phase current traveling wave is carried out to four layers of wavelet transformation respectively, respectively
Corresponding wavelet modulus maxima is extracted according to respective wavelet transform result；
Respectively to the wavelet modulus maxima with corresponding three-phase current of the modulus of each layer of three-phase voltage traveling wave in four layers
The wavelet modulus maxima of the modulus of traveling wave carries out Polarity comparision；
If having at least polarity of the wavelet modulus maxima of the modulus of three layers of the three-phase voltage traveling wave and corresponding three-phase
The polarity of the wavelet modulus maxima of the modulus of current traveling wave is on the contrary, then determine that disturbance occurs in the line electricity source relay
The non-transformer end of device.
10. single-phase earthing traveling-wave protection device according to claim 9, which is characterized in that
The modulus of the three-phase voltage traveling wave includes three-phase voltage traveling wave Aerial mode component and/or three-phase voltage traveling wave zero _exit；
The modulus of the three-phase current traveling wave includes three-phase current traveling wave Aerial mode component and/or three-phase current traveling wave zero _exit.
11. single-phase earthing traveling-wave protection device according to any one of claims 7 to 10, which is characterized in that the event
Hinder unit, be specifically used for:
The three-phase main-frequency voltage and three-phase main-frequency electric current at the route both ends are acquired in real time；
Storing initial three-phase main-frequency voltage and initial three-phase main-frequency electric current respectively, and to the initial three-phase main-frequency voltage and described
Initial three-phase main-frequency electric current carries out Phase-Sequence Transformation respectively, obtain power frequency residual voltage virtual value and three-phase main-frequency electric current it is effective
Value；
Compare the power frequency residual voltage virtual value and voltage setting valve, if the power frequency residual voltage virtual value is more than or equal to institute
Voltage setting valve is stated, then determines that ground fault occurs for the non-transformer end of the line electricity source relay；
When ground fault occurs for the non-transformer end for determining the line electricity source relay, the three-phase main-frequency electric current has
Valid value and current setting, if the virtual value of each phase power current is below the current calibration in the three-phase main-frequency electric current
Value then determines that singlephase earth fault occurs for the non-transformer end of the line electricity source relay.
12. single-phase earthing traveling-wave protection device according to claim 11, which is characterized in that
The voltage setting valve be equal to the route operate normally lower residual voltage upper critical value and the first predetermined coefficient it
Product；
The current setting be equal to the route operate normally lower load current upper critical value and the second predetermined coefficient it
Product.
13. a kind of computer equipment, including memory, processor and it is stored on the memory and can be on the processor
The computer program of operation, which is characterized in that the processor is for executing such as any one of claims 1 to 6 the method
The step of.
14. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that
The computer program is realized when being executed by processor such as the step of any one of claims 1 to 6 the method.
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| CN110470944B (en) * | 2019-08-28 | 2021-09-21 | 三峡大学 | Regional power grid fault positioning method based on node fault domain time difference method |
| CN111007427B (en) * | 2019-11-23 | 2021-05-04 | 清华大学 | Distribution line single-phase earth fault line selection method and computer readable storage medium |
| CN110736900A (en) * | 2019-12-04 | 2020-01-31 | 国家电网有限公司 | distribution line single-phase earth fault line selection method based on directional traveling waves |
| CN111123033B (en) * | 2019-12-23 | 2022-07-29 | 贵州电网有限责任公司 | Distribution line potential fault identification method |
| CN111123032A (en) * | 2019-12-23 | 2020-05-08 | 贵州电网有限责任公司 | Distribution lines latent fault identification system |
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