CN107979076A - A kind of line protection method and system based on transient state component spectrum signature - Google Patents
A kind of line protection method and system based on transient state component spectrum signature Download PDFInfo
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- CN107979076A CN107979076A CN201711235417.6A CN201711235417A CN107979076A CN 107979076 A CN107979076 A CN 107979076A CN 201711235417 A CN201711235417 A CN 201711235417A CN 107979076 A CN107979076 A CN 107979076A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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Abstract
A kind of line protection method and system based on transient state component spectrum signature, including：The circuit both sides three-phase current after failure is obtained, and calculates the β mould electric currents on the basis of three-phase；When the β moulds electric current of three-phase is not 0, generation phase-to phase fault, judges phase-to phase fault type using phase-to phase fault Protection criteria set in advance；When phase-to phase fault type is troubles inside the sample space, quick acting is protected；When phase-to phase fault type is external area error, without protection act；Phase-to phase fault Protection criteria set in advance includes：According to the circuit both sides β moulds current spectrum and spectral difference determines in area and external area error.Technical scheme criterion is adaptable, is applicable not only to distribution capacity larger super, UHV transmission line, to serial supplementary line and is provided with the transmission line of electricity of shunt reactor.
Description
Technical field
The present invention relates to technical field of electricity, and in particular to a kind of line protection based on transient state component spectrum signature
Method and system.
Background technology
For high-tension line, especially surpass, UHV transmission line, since line distribution capacitance is big, the capacitance after failure
Electric current can influence the performance of power frequency amount protection, and conventional method is that capacitance current is compensated at present.But event in area
During barrier, since the presence of trouble point can make circuit model change, so that taking action current and event after indemnifying measure
Barrier point electric current is variant, when line length reaches a certain level, is likely to result in relay fail.Due to heavy-duty generator and
The effective resistance very little of transmission line of electricity with split conductor, the damping time constant of network is very big, electric current, voltage when making short circuit
Transient state component decay it is very slow, thus transient state transient process will continue long period of time, power frequency quality can be seriously affected
Waveform and phase, and then protection misoperation may be caused, the measure used at present is filtered out using wave filter, but temporarily
Include substantial amounts of useful fault message in state component, the information by efficiently using transient state component can improve the action of protection
Performance.
At present, the Protective strategy based on transient state component focuses primarily upon temporal signatures utilization, special using transient state component frequency domain
The protection philosophy of sign is seldom.
The content of the invention
In order to solve the above-mentioned deficiency in the presence of the prior art, the present invention provides one kind and is based on transient state component spectrum signature
Line protection method and system.
A kind of line protection method based on transient state component spectrum signature, including：
The circuit both sides three-phase current after failure is obtained, and calculates the β mould electric currents on the basis of three-phase；
When the β moulds electric current of three-phase is not 0, generation phase-to phase fault, is sentenced using phase-to phase fault set in advance protection
It is judged that the phase-to phase fault type；
When the phase-to phase fault type is troubles inside the sample space, quick acting is protected；
When the phase-to phase fault type is external area error, without protection act；
The phase-to phase fault Protection criteria set in advance includes：According to the circuit both sides β moulds current spectrum and frequency spectrum
Difference determines in area and external area error.
Preferably, the phase-to phase fault Protection criteria set in advance includes：
The frequency spectrum of the β moulds electric current is calculated according to fourier algorithm model；
Calculus of differences pretreatment is carried out to the spectrum signal of the β moulds electric current according to the threshold value of setting；
It is poor that circuit both sides β mould current spectrums are calculated according to pretreated result；
According to the circuit both sides β moulds current spectrum and spectral difference determines in area and external area error.
Preferably, the circuit both sides three-phase current after failure is obtained, and calculates the β mould electric currents on the basis of three-phase, including：
Circuit both sides three-phase current after collection failure, calculates the β mould electric currents on the basis of A, B, C phase respectively.
Preferably, the frequency spectrum that the β moulds electric current is calculated according to fourier algorithm model, including:
The frequency spectrum of the β moulds electric current is calculated as follows
In formula, I (fN) represent：Current amplitude；N is represented:Frequency spectrum number；iβRepresent：Current beta modulus value；N is represented：Sampled value.
Preferably, calculus of differences pretreatment, bag are carried out to the spectrum signal of the β moulds electric current according to the threshold value of setting
Include：
The frequency values that amplitude in the current spectrum is less than to the threshold value carry out zero setting processing；
Otherwise, spectrum value is carried out putting 1A processing；
The threshold value is the frequency values of Iset.
Preferably, it is poor according to pretreated result calculating circuit both sides β mould current spectrums, including：
Calculate side β mould current spectrums in difference on the frequency of two amplitudes for 1A frequencies between, and transmission to circuit offside into
Row same treatment.
Preferably, according to the circuit both sides β moulds current spectrum and spectral difference determines in area and external area error, including：
The difference on the frequency size of alternative route both sides β mould current spectrums；
When the absolute value of the difference on the frequency of the both sides β mould current spectrums is less than definite value Ifset, it is determined as external area error,
Otherwise, it is determined that it is troubles inside the sample space.
Preferably, according to the circuit both sides β moulds current spectrum and spectral difference determines in area and external area error, further include：
When the frequency values for being more than the threshold value Iset in β mould current spectrums in side in circuit both sides without amplitude, opposite side
The frequency values for having amplitude to be more than the threshold value Iset in frequency spectrum β mould current spectrums, are judged as troubles inside the sample space；
When the frequency values for being more than the threshold value Iset in β moulds current spectrum in circuit both sides without amplitude, Protection criteria
Exit.
Another object of the present invention is to propose a kind of transmission line protection system based on transient state component spectrum signature, bag
Include：Obtain computing module, breakdown judge module, fault processing module and criterion module；
The acquisition computing module, for obtaining the circuit both sides three-phase current after failure, and calculates on the basis of three-phase
β mould electric currents；
The breakdown judge module, is not 0 for the β moulds electric current when three-phase, judges phase-to phase fault occurs, and adopt
Judge the phase-to phase fault type with phase-to phase fault Protection criteria set in advance；
The fault processing module, for when the phase-to phase fault type is troubles inside the sample space, protecting quick acting；Work as institute
When to state phase-to phase fault type be external area error, without protection act；
The criterion module, for determining event outside Nei He areas of area according to the circuit both sides β moulds current spectrum and spectral difference
Barrier.
Preferably, the criterion module, including：Calculating sub module, pretreatment submodule, calculate spectral difference submodule and really
Stator modules；
The calculating sub module, for calculating the frequency spectrum of the β moulds electric current according to fourier algorithm model；
The pretreatment submodule, difference is carried out for the threshold value according to setting to the spectrum signal of the β moulds electric current
Computing pre-processes；
The calculating spectral difference submodule, it is poor for calculating circuit both sides β mould current spectrums according to pretreated result；
The determination sub-module, for being determined according to the circuit both sides β moulds current spectrum and spectral difference outside Nei He areas of area
Failure.
Preferably, the calculating sub module, including：Fourier algorithm model；
By the fourier algorithm model, the frequency spectrum of the β moulds electric current is calculated as follows
In formula, I (fN) represent：Current amplitude；N is represented:Frequency spectrum number；iβRepresent：Current beta modulus value；N is represented：Sampled value.
Preferably, the fault processing module, the first processing submodule and second processing submodule；
The first processing submodule, for judging that the difference on the frequencies of line both sides β mould current spectrums and definite value Ifset's is big
It is small；
When the absolute value of the difference on the frequency of the both sides β mould current spectrums is less than definite value Ifset, it is determined as external area error；
Otherwise, it is determined that it is troubles inside the sample space；
The second processing submodule, amplitude and the threshold value Iset's of the β mould current spectrums for judging circuit both sides
Size；
When the frequency values for being more than the threshold value Iset in β mould current spectrums in side in circuit both sides without amplitude, opposite side
The frequency values for having amplitude to be more than the threshold value Iset in frequency spectrum β mould current spectrums, are judged as troubles inside the sample space；
When the frequency values for being more than the threshold value Iset in β moulds current spectrum in circuit both sides without amplitude, Protection criteria
Exit.
Compared with prior art, beneficial effects of the present invention are：
The technical scheme is that it is dynamic that quick protection is made based on the Protection criteria of current temporary state component spectrum signature
Make；After breaking down, the circuit both sides three-phase current of acquisition, and the β mould electric currents on the basis of three-phase are calculated, when the β moulds of three-phase
Electric current is not 0, phase-to phase fault occurs, and judge phase-to phase fault class by using phase-to phase fault Protection criteria set in advance
Type；According to circuit both sides β moulds current spectrum and spectral difference determines in area and external area error, when troubles inside the sample space, protects fast quick-action
Make, during external area error, protect not malfunction.
The Protection criteria of technical scheme is without circuit both ends electrical quantity synchronized sampling, from system operation side
Formula, load current, transition resistance, fault moment, PT and CT broken strings, system oscillation influence；And criterion is adaptable, not only fit
Larger for distribution capacity super, UHV transmission line, to serial supplementary line and is provided with the transmission line of electricity of shunt reactor.
Technical scheme only needs calculating current frequency spectrum, relatively low to sample rate requirement, utilizes Fourier algorithm meter
Frequency spectrum is calculated, calculation amount is small.
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is the transmission line malfunction schematic diagram of the present invention；
Circuit both sides β mould current spectrums when Fig. 3 is the F1 failures of the present invention；
β mould current spectrums after the data prediction of circuit both sides when Fig. 4 is the F1 failures of the present invention；
Circuit both sides β mould current spectrums when Fig. 5 is the F2 failures of the present invention；
β mould current spectrums after the data prediction of circuit both sides when Fig. 6 is the F2 failures of the present invention；
Wherein, F2 is troubles inside the sample space point in Fig. 1, and F1 is external area error point.
Embodiment
For a better understanding of the present invention, present disclosure is done further with reference to Figure of description and example
Explanation.
The present invention utilizes subregion inside and outside phase-to phase fault in transient state component spectrum region after transmission line malfunction.Due to transmission pressure
Between there are mutual inductance, three-phase electrical quantity can influence each other after failure, can be decoupled electrical quantity by transition matrix, eliminate
The influence of mutual inductance, obtains mutually independent electrical quantity.Electrical quantity after decoupling can be divided into Aerial mode componentWith zero mould point
AmountTwo kinds.There was only Aerial mode component during phase fault, without zero _exit.Phase-to phase fault includes phase fault and phase indirectly
Failure, phase fault is divided into three-phase shortcircuit and line to line fault, and when three-phase shortcircuit occurs for circuit, system is separated from short circuit,
The transient state component of trouble point both sides is independent；During line to line fault, short-circuit additional components in two failure phases are equal in magnitude, direction
On the contrary, the sum of electromotive force that they sense in phase is perfected is zero, so the transient state component of short dot both sides is independent of each other；Two-phase
During ground connection, β modulus is propagated between two failure phases, from the influence of zero _exit and trouble point opposite side transient state component.Circuit
During generation phase-to phase fault (phase fault and two phase ground), trouble point both sides transient current β modulus is mutually independent.Utilize β
Frequency spectrum difference in modulus can realize area's internal and external fault identification.
A kind of line protection method based on transient state component spectrum signature as described in Figure 1, including：
The circuit both sides three-phase current after failure is obtained, and calculates the β mould electric currents on the basis of three-phase；
When the β moulds electric current of three-phase is not 0, generation phase-to phase fault, is sentenced using phase-to phase fault set in advance protection
It is judged that the phase-to phase fault type；
When the phase-to phase fault type is troubles inside the sample space, quick acting is protected；
When the phase-to phase fault type is external area error, without protection act；
Phase-to phase fault Protection criteria set in advance includes：It is true according to the circuit both sides β moulds current spectrum and spectral difference
Determine in area and external area error.
Phase-to phase fault Protection criteria set in advance includes：
The frequency spectrum of the β moulds electric current is calculated according to fourier algorithm model；
Calculus of differences pretreatment is carried out to the spectrum signal of the β moulds electric current according to the threshold value of setting；
It is poor that circuit both sides β mould current spectrums are calculated according to pretreated result；
According to the circuit both sides β moulds current spectrum and spectral difference determines in area and external area error.
The circuit both sides three-phase current after failure is obtained, and calculates the β mould electric currents on the basis of three-phase, including：Collection event
Circuit both sides three-phase current after barrier, calculates the β mould electric currents on the basis of A, B, C phase respectively.
The frequency spectrum that the β moulds electric current is calculated according to fourier algorithm model, including:
The frequency spectrum of the β moulds electric current is calculated as follows
In formula, I (fN) represent：Current amplitude；N is represented:Frequency spectrum number；iβRepresent：Current beta modulus value；N is represented：Sampled value.
Calculus of differences pretreatment is carried out to the spectrum signal of the β moulds electric current according to the threshold value of setting, including：
The frequency values that amplitude in the current spectrum is less than to the threshold value carry out zero setting processing；
Otherwise, spectrum value is carried out putting 1A processing；
The threshold value is the frequency values of Iset.
It is poor according to pretreated result calculating circuit both sides β mould current spectrums, including：
Calculate side β mould current spectrums in difference on the frequency of two amplitudes for 1A frequencies between, and transmission to circuit offside into
Row same treatment.
According to the circuit both sides β moulds current spectrum and spectral difference determines in area and external area error, including：
The difference on the frequency size of alternative route both sides β mould current spectrums；
When the absolute value of the difference on the frequency of the both sides β mould current spectrums is less than definite value Ifset, it is determined as external area error,
Otherwise, it is determined that it is troubles inside the sample space.
According to the circuit both sides β moulds current spectrum and spectral difference determines in area and external area error, further includes：
When the frequency values for being more than the threshold value Iset in β mould current spectrums in side in circuit both sides without amplitude, opposite side
The frequency values for having amplitude to be more than the threshold value Iset in frequency spectrum β mould current spectrums, are judged as troubles inside the sample space；
When the frequency values for being more than the threshold value Iset in β moulds current spectrum in circuit both sides without amplitude, Protection criteria
Exit.
Embodiment 1：System shown in Figure 2 F1 point external area errors
(1) transmission line of electricity both sides three-phase current is gatheredCalculate circuit both sides current beta mould point
Amount, calculation formula areβ mould current spectrums (Fig. 3 is calculated using Fourier algorithm
It is shown).
It is calculated as follows
In formula, I (fN) represent：Current amplitude；N is represented:Frequency spectrum number；iβRepresent：Current beta modulus value；N is represented：Sampled value.
(2) calculus of differences is carried out to spectrum signal, sets threshold value Iset, amplitude in current spectrum is less than to the frequency of Iset
Rate value zero setting.Retain amplitude in frequency spectrum and be more than the frequency values of Iset, and its amplitude is set to 1A, remaining sets to 0, the frequency spectrum after processing
As shown in Figure 4.
(3) frequency difference Δ f at protection 1 is calculated1, protection 2 is transmitted to, frequency difference is Δ f at protection 22, and Δ f2-Δf2＜
Fset, is judged as external area error.
Embodiment 2：System shown in Figure 2 F2 point troubles inside the sample spaces
(1) transmission line of electricity both sides three-phase current is gatheredCalculate circuit both sides current beta mould point
Amount, calculation formula areCalculate β moulds current spectrum (shown in Fig. 5).
(2) calculus of differences is carried out to spectrum signal, sets threshold value Iset, amplitude in current spectrum is less than to the frequency of Iset
Rate value zero setting.Retain amplitude in frequency spectrum and be more than the frequency values of Iset, and its amplitude is set to 1A, such as Fig. 6 of the frequency spectrum after processing institutes
Show.
(3) frequency difference Δ f at protection 1 is calculated1, protection 2 is transmitted to, frequency difference is Δ f at protection 22, and Δ f2-Δf2＞
Fset, is judged as troubles inside the sample space.
A kind of transmission line protection system based on transient state component spectrum signature of proposition of the present invention, the principle and a kind of base
It is identical in the line protection method of transient state component spectrum signature, the module of system is further described below：
Including：Obtain computing module, breakdown judge module, fault processing module and criterion module；
Computing module is obtained, for obtaining the circuit both sides three-phase current after failure, and calculates the β moulds on the basis of three-phase
Electric current；
Breakdown judge module, is not 0 for the β moulds electric current when three-phase, judges phase-to phase fault occurs, and using pre-
The phase-to phase fault Protection criteria first set judges the phase-to phase fault type；
Fault processing module, for when the phase-to phase fault type is troubles inside the sample space, protecting quick acting；When the phase
Between fault type when being external area error, without protection act；
Criterion module, for according to the circuit both sides β moulds current spectrum and spectral difference determines in area and external area error.
Criterion module, including：Calculating sub module, pretreatment submodule, calculate spectral difference submodule and determination sub-module；
Calculating sub module, for calculating the frequency spectrum of the β moulds electric current according to fourier algorithm model；
Submodule is pre-processed, calculus of differences is carried out to the spectrum signal of the β moulds electric current for the threshold value according to setting
Pretreatment；
Spectral difference submodule is calculated, it is poor for calculating circuit both sides β mould current spectrums according to pretreated result；
Determination sub-module, for according to the circuit both sides β moulds current spectrum and spectral difference determines in area and external area error；
Calculating sub module, including：Fourier algorithm model；
By the fourier algorithm model, the frequency spectrum of the β moulds electric current is calculated as follows
In formula, I (fN) represent：Current amplitude；N is represented:Frequency spectrum number；iβRepresent：Current beta modulus value；N is represented：Sampled value.
Fault processing module, the first processing submodule and second processing submodule；
First processing submodule, for judging the difference on the frequency of line both sides β mould current spectrums and the size of definite value Ifset；
When the absolute value of the difference on the frequency of the both sides β mould current spectrums is less than definite value Ifset, it is determined as external area error；
Otherwise, it is determined that it is troubles inside the sample space；
Second processing submodule, for the amplitude and the size of threshold value Iset of the β mould current spectrums for judging circuit both sides；
When the frequency values for being more than the threshold value Iset in β mould current spectrums in side in circuit both sides without amplitude, opposite side
The frequency values for having amplitude to be more than the threshold value Iset in frequency spectrum β mould current spectrums, are judged as troubles inside the sample space；
When the frequency values for being more than the threshold value Iset in β moulds current spectrum in circuit both sides without amplitude, Protection criteria
Exit.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program
Product.Therefore, the application can use the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the application can use the computer for wherein including computer usable program code in one or more
The computer program production that usable storage medium is implemented on (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is with reference to the flow according to the method for the embodiment of the present application, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or square frame in journey and/or square frame and flowchart and/or the block diagram.These computer programs can be provided
The processors of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices, which produces, to be used in fact
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided and is used for realization in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a square frame or multiple square frames.
It these are only the embodiment of the present invention, be not intended to limit the invention, it is all in the spirit and principles in the present invention
Within, any modification, equivalent substitution, improvement and etc. done, be all contained in apply pending scope of the presently claimed invention it
It is interior.
Claims (12)
- A kind of 1. line protection method based on transient state component spectrum signature, it is characterised in that including：The circuit both sides three-phase current after failure is obtained, and calculates the β mould electric currents on the basis of three-phase；When the β moulds electric current of three-phase is not 0, generation phase-to phase fault, is sentenced using phase-to phase fault Protection criteria set in advance The disconnected phase-to phase fault type；When the phase-to phase fault type is troubles inside the sample space, quick acting is protected；When the phase-to phase fault type is external area error, without protection act；The phase-to phase fault Protection criteria set in advance includes：It is true according to the circuit both sides β moulds current spectrum and spectral difference Determine in area and external area error.
- 2. the line protection method based on transient state component spectrum signature as claimed in claim 1, it is characterised in that described Phase-to phase fault Protection criteria set in advance includes：The frequency spectrum of the β moulds electric current is calculated according to fourier algorithm model；Calculus of differences pretreatment is carried out to the spectrum signal of the β moulds electric current according to the threshold value of setting；It is poor that circuit both sides β mould current spectrums are calculated according to pretreated result；According to the circuit both sides β moulds current spectrum and spectral difference determines in area and external area error.
- 3. the line protection method based on transient state component spectrum signature as claimed in claim 1, it is characterised in that obtain Circuit both sides three-phase current after failure, and the β mould electric currents on the basis of three-phase are calculated, including：Circuit both sides three-phase current after collection failure, calculates the β mould electric currents on the basis of A, B, C phase respectively.
- 4. the line protection method based on transient state component spectrum signature as claimed in claim 2, it is characterised in that described The frequency spectrum of the β moulds electric current is calculated according to fourier algorithm model, including:The frequency spectrum of the β moulds electric current is calculated as follows<mrow> <mi>I</mi> <mrow> <mo>(</mo> <msub> <mi>f</mi> <mi>N</mi> </msub> <mo>)</mo> </mrow> <mo>=</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>n</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <msub> <mi>i</mi> <mi>&beta;</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msup> <mi>e</mi> <mrow> <mo>-</mo> <mi>j</mi> <mfrac> <mrow> <mn>2</mn> <mi>&pi;</mi> </mrow> <mi>N</mi> </mfrac> </mrow> </msup> <mo>,</mo> <mi>N</mi> <mo>=</mo> <mn>0</mn> <mo>,</mo> <mn>1</mn> <mo>,</mo> <mn>...</mn> <mo>,</mo> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow>In formula, I (fN) represent：Current amplitude；N is represented:Frequency spectrum number；iβRepresent：Current beta modulus value；N is represented：Sampled value.
- 5. the line protection method based on transient state component spectrum signature as claimed in claim 2, it is characterised in that according to The threshold value of setting carries out calculus of differences pretreatment to the spectrum signal of the β moulds electric current, including：The frequency values that amplitude in the current spectrum is less than to the threshold value carry out zero setting processing；Otherwise, spectrum value is carried out putting 1A processing；The threshold value is the frequency values of Iset.
- 6. the line protection method based on transient state component spectrum signature as claimed in claim 2, it is characterised in that according to Pretreated result calculating circuit both sides β mould current spectrums are poor, including：Difference on the frequency of two amplitudes between 1A frequencies in the β mould current spectrums of side is calculated, and sends to circuit offside and carries out phase With processing.
- 7. the line protection method based on transient state component spectrum signature as claimed in claim 2, it is characterised in that according to The circuit both sides β moulds current spectrum and spectral difference determines in area and external area error, including：The difference on the frequency size of alternative route both sides β mould current spectrums；When the absolute value of the difference on the frequency of the both sides β mould current spectrums is less than definite value Ifset, it is determined as external area error,Otherwise, it is determined that it is troubles inside the sample space.
- 8. the line protection method based on transient state component spectrum signature as claimed in claim 7, it is characterised in that according to The circuit both sides β moulds current spectrum and spectral difference determines in area and external area error, further includes：As the frequency values for being more than the threshold value Iset in β mould current spectrums in side in circuit both sides without amplitude, opposite side frequency spectrum β The frequency values for having amplitude to be more than the threshold value Iset in mould current spectrum, are judged as troubles inside the sample space；When the frequency values for being more than the threshold value Iset in β moulds current spectrum in circuit both sides without amplitude, Protection criteria exits.
- A kind of 9. transmission line protection system based on transient state component spectrum signature, it is characterised in that including：Obtain and calculate mould Block, breakdown judge module, fault processing module and criterion module；The acquisition computing module, for obtaining the circuit both sides three-phase current after failure, and calculates the β moulds on the basis of three-phase Electric current；The breakdown judge module, is not 0 for the β moulds electric current when three-phase, judges phase-to phase fault occurs, and using pre- The phase-to phase fault Protection criteria first set judges the phase-to phase fault type；The fault processing module, for when the phase-to phase fault type is troubles inside the sample space, protecting quick acting；When the phase Between fault type when being external area error, without protection act；The criterion module, for according to the circuit both sides β moulds current spectrum and spectral difference determines in area and external area error.
- 10. the transmission line protection system as claimed in claim 9 based on transient state component spectrum signature, it is characterised in that institute Criterion module is stated, including：Calculating sub module, pretreatment submodule, calculate spectral difference submodule and determination sub-module；The calculating sub module, for calculating the frequency spectrum of the β moulds electric current according to fourier algorithm model；The pretreatment submodule, calculus of differences is carried out for the threshold value according to setting to the spectrum signal of the β moulds electric current Pretreatment；The calculating spectral difference submodule, it is poor for calculating circuit both sides β mould current spectrums according to pretreated result；The determination sub-module, for according to the circuit both sides β moulds current spectrum and spectral difference determines in area and external area error.
- 11. the transmission line protection system as claimed in claim 10 based on transient state component spectrum signature, it is characterised in that institute Calculating sub module is stated, including：Fourier algorithm model；By the fourier algorithm model, the frequency spectrum of the β moulds electric current is calculated as follows<mrow> <mi>I</mi> <mrow> <mo>(</mo> <msub> <mi>f</mi> <mi>N</mi> </msub> <mo>)</mo> </mrow> <mo>=</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>n</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <msub> <mi>i</mi> <mi>&beta;</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msup> <mi>e</mi> <mrow> <mo>-</mo> <mi>j</mi> <mfrac> <mrow> <mn>2</mn> <mi>&pi;</mi> </mrow> <mi>N</mi> </mfrac> </mrow> </msup> <mo>,</mo> <mi>N</mi> <mo>=</mo> <mn>0</mn> <mo>,</mo> <mn>1</mn> <mo>,</mo> <mn>...</mn> <mo>,</mo> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow>In formula, I (fN) represent：Current amplitude；N is represented:Frequency spectrum number；iβRepresent：Current beta modulus value；N is represented：Sampled value.
- 12. the transmission line protection system as claimed in claim 9 based on transient state component spectrum signature, it is characterised in that institute State fault processing module, the first processing submodule and second processing submodule；The first processing submodule, for judging the difference on the frequency of line both sides β mould current spectrums and the size of definite value Ifset；When the absolute value of the difference on the frequency of the both sides β mould current spectrums is less than definite value Ifset, it is determined as external area error；Otherwise, it is determined that it is troubles inside the sample space；The second processing submodule, for the amplitude and the size of threshold value Iset of the β mould current spectrums for judging circuit both sides；As the frequency values for being more than the threshold value Iset in β mould current spectrums in side in circuit both sides without amplitude, opposite side frequency spectrum β The frequency values for having amplitude to be more than the threshold value Iset in mould current spectrum, are judged as troubles inside the sample space；When the frequency values for being more than the threshold value Iset in β moulds current spectrum in circuit both sides without amplitude, Protection criteria exits.
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