CN107728098A - With the method and system of direct current method verification current transformer electrical-magnetic model parameter - Google Patents
With the method and system of direct current method verification current transformer electrical-magnetic model parameter Download PDFInfo
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- CN107728098A CN107728098A CN201711147264.XA CN201711147264A CN107728098A CN 107728098 A CN107728098 A CN 107728098A CN 201711147264 A CN201711147264 A CN 201711147264A CN 107728098 A CN107728098 A CN 107728098A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The embodiment of the invention discloses a kind of method and system that current transformer electrical-magnetic model parameter is verified with direct current method, wherein, this method includes：Cause the core sataration of the current transformer to the primary side application DC current of the current transformer, obtain surveying secondary side current waveform；The current transformer model corresponding with the current transformer got, and apply the DC current to the primary side of the current transformer model, obtain emulating secondary side current waveform；Judge whether the actual measurement secondary side current waveform and the deviation of the emulation secondary side current waveform are more than preset distortion value, if being more than, determine that the parameter of the current transformer model is unqualified, if being not more than, determine that the parameter of the current transformer model is qualified.
Description
Technical field
Current transformer electromagnetism is verified the present invention relates to Relay Protection Technology in Power System field, more particularly to direct current method
The method and system of transient Model parameter.
Background technology
With the fast development of power industry, power network scale increasingly increases, structure even more complex, generating set single-machine capacity
Improve constantly, complicated transient process proposes higher requirement to the performance of protective current transformer, in power system.Closely
Excessive cause inrush current of transformer or external area error, which occur, for power network over a little years causes transformer, the thing of differential protection for generator malfunction
Part, to equipment, safety and system stable operation constitute harm in itself.Through analyzing, current transformer during electric network electromagnet transient
One of the main reason for generation saturation is caused differential protection exception.Because the factor for influenceing transformer saturation is numerous, such as one
The size and decay duration of short circuit current level, aperiodic component during subsystem short circuit, sky is caused when closing transformer to encourage
Magnetic shoves and size, rate of decay and load level with echo surge current, current transformer iron core structure and material (TPY, P, PR
Type) and secondary load impedence size etc., conventional manual calculation analysis method be difficult calculate current transformer above-mentioned each
Response output in kind transient process.
The method for being usually used in the calculating of current transformer excitation property at present has two kinds of analytical Calculation, electromagnetic transient simulation sides
Method.The former is only applicable to the linearity range of transformer iron core magnetization curve, in the non-linear section of magnetization curve, because magnetic conductivity is not
Constant, and its expression formula is extremely complex, it is difficult to carry out analytical Calculation.The latter current transformer model then be present needed for parameter be not easy
The problem of acquisition, lack reliable means although the method that existing document proposes various computation model parameters, in application and come school
Whether the setting for testing model parameter is reasonable.
Therefore, it is usually used in shortage reliable means in the method for current transformer excitation property calculating at present and carrys out Knowledge Verification Model ginseng
Whether several setting is rationally those skilled in the art's technical problem urgently to be resolved hurrily.
The content of the invention
The embodiments of the invention provide it is a kind of with direct current method verify current transformer electrical-magnetic model parameter method and
System, solve shortage reliable means in the current method for being usually used in current transformer excitation property and calculating and carry out Knowledge Verification Model parameter
The whether rational technical problem of setting.
The embodiments of the invention provide it is a kind of with direct current method verify current transformer electrical-magnetic model parameter method, its
It is characterised by, including：
S1：Cause the core sataration of the current transformer to the primary side application DC current of current transformer, obtain
Survey secondary side current waveform；
S2：The current transformer model corresponding with the current transformer got, and to the current transformer
The primary side of model applies the DC current, obtains emulating secondary side current waveform；
S3：Judge whether the actual measurement secondary side current waveform and the deviation of the emulation secondary side current waveform are more than in advance
Deviation is put, if being more than, determines that the parameter of the current transformer model is unqualified, if being not more than, determines the Current Mutual Inductance
The parameter of device model is qualified.
Preferably, the excitation property of the current transformer model is corresponding with the excitation property of the current transformer,
Wherein, the excitation property includes C-V characteristic and magnetization curve.
Preferably, step S2 is specifically included：
S201：Get the primary circuit parameter and two during applying the DC current to the current transformer
Minor loop parameter；
S202：The direct current established according to the primary circuit parameter, the secondary circuit parameter in l-G simulation test model
Source model, primary system Resistance model for prediction, primary system reactance model, breaker model, breaker control submodel, secondary load
Model and waveform recording and output submodel；
S203：The Current Mutual Inductance is established according to the excitation property of the current transformer by parameter identification computational methods
Device model；
S204：The l-G simulation test model is run, by the dc source model to the current transformer model
Primary side applies the DC current, obtains emulating secondary side current waveform.
Preferably, step S3 is specifically included：
As with reference to the moment at the time of to start to apply the DC current, actual measurement secondary side current waveform is raised to from above freezing
Point during 30% peak value will survey point of the secondary side current waveform from peak-fall to 30% peak value as taking as sampling starting point
Sample terminal, then using the section between the sampling starting point and the sampling terminal as sampling range, it is pointed to the sampling area
The interior actual measurement secondary side current waveform and the emulation secondary side current waveform are sampled point by point, obtain measured current
Sequence and simulated current sequence, judged by preset formula inclined between the measured current sequence and the simulated current sequence
Whether difference is more than preset distortion value, if being more than, determines that the parameter of the current transformer model is unqualified, if being not more than, it is determined that
The parameter of the current transformer model is qualified；
Wherein, the preset formula is：
Wherein, R is deviation, AnFor measured current sequence, BnFor simulated current sequence, N is total points of sampling.
Preferably, the preset distortion value is 0.1.
Preferably, the embodiment of the present invention additionally provides one kind direct current method verification current transformer electrical-magnetic model parameter
System, including：DC current generator, adjustable resistance, current transformer, wave tracer and electromagnetic transient simulation terminal；
The DC current generator is connected with the primary side of the current transformer；
The adjustable resistance is connected with the secondary side of the current transformer；
The wave tracer connects with the current transformer；
The electromagnetic transient simulation terminal is connected with the wave tracer；
The DC current generator is used to cause the electricity to the primary side application DC current of the current transformer
The core sataration of current transformer, obtain surveying secondary side current waveform；
The electromagnetic transient simulation terminal is used for the current transformer mould corresponding with the current transformer got
Type, and apply the DC current to the primary side of the current transformer model, obtain emulating secondary side current waveform；
The electromagnetic transient simulation terminal is additionally operable to judge the actual measurement secondary side current waveform and the emulation secondary side
Whether the deviation of current waveform is more than preset distortion value, if being more than, determines that the parameter of the current transformer model is unqualified, if
It is not more than, determines that the parameter of the current transformer model is qualified.
Preferably, the excitation property of the current transformer model is corresponding with the excitation property of the current transformer,
Wherein, the excitation property includes C-V characteristic and magnetization curve.
Preferably, the electromagnetic transient simulation terminal is specifically additionally operable to：
Get the primary circuit parameter and secondary returning during applying the DC current to the current transformer
Road parameter；
The dc source mould established according to the primary circuit parameter, the secondary circuit parameter in l-G simulation test model
Type, primary system Resistance model for prediction, primary system reactance model, breaker model, breaker control submodel, secondary load model
With waveform recording and output submodel；
The current transformer mould is established according to the excitation property of the current transformer by parameter identification computational methods
Type；
The l-G simulation test model is run, the primary side by the dc source model to the current transformer model
Apply the DC current, obtain emulating secondary side current waveform.
Preferably, when at the time of the electromagnetic transient simulation terminal is additionally operable to start to apply the DC current as reference
Carve, using survey secondary side current waveform from it is above freezing be raised to 30% peak value when point as starting point is sampled, secondary side current will be surveyed
Point of the waveform from peak-fall to 30% peak value is sampled between starting point and the sampling terminal as sampling terminal, then by described
Section is as sampling range, the actual measurement secondary side current waveform and the emulation secondary side being pointed in the sampling range
Current waveform is sampled point by point, obtains measured current sequence and simulated current sequence, judges the actual measurement by preset formula
Whether the deviation between current sequence and the simulated current sequence is more than preset distortion value, if being more than, determines that the electric current is mutual
The parameter of sensor model is unqualified, if being not more than, determines that the parameter of the current transformer model is qualified；
Wherein, the preset formula is：
Wherein, R is deviation, AnFor measured current sequence, BnFor simulated current sequence, N is total points of sampling.
Preferably, the preset distortion value is 0.1.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below：
The invention provides it is a kind of with direct current method verify current transformer electrical-magnetic model parameter method and system, its
In, this method includes：Cause the core sataration of the current transformer to the primary side application DC current of current transformer, obtain
To actual measurement secondary side current waveform；The current transformer model corresponding with the current transformer got, and to described
The primary side of current transformer model applies the DC current, obtains emulating secondary side current waveform；Judge the actual measurement two
Whether the deviation of secondary side current waveform and the emulation secondary side current waveform is more than preset distortion value, if being more than, it is determined that described
The parameter of current transformer model is unqualified, if being not more than, determines that the parameter of the current transformer model is qualified.The present invention with
The real-time transient response of comparison entity current transformer impact DC current and simulated current transformer model impact DC current
Real-time transient response based on, verify protective current transformer, electromagnetic transient simulation model parameter, the electricity established with this
Current transformer simulation model has the transient response performance highly consistent with prototype, can be greatly enhanced current transformer transient state biography
Become the degree of accuracy of Performance Analysis.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is a reality of the method provided by the invention that current transformer electrical-magnetic model parameter is verified with direct current method
Apply the schematic flow sheet of example；
Fig. 2 is another of the method provided by the invention that current transformer electrical-magnetic model parameter is verified with direct current method
The schematic flow sheet of embodiment；
Fig. 3 is a reality of the system provided by the invention that current transformer electrical-magnetic model parameter is verified with direct current method
Apply the structural representation of example.
Embodiment
The embodiments of the invention provide it is a kind of with direct current method verify current transformer electrical-magnetic model parameter method and
System, solve shortage reliable means in the current method for being usually used in current transformer excitation property and calculating and carry out Knowledge Verification Model parameter
The whether rational technical problem of setting.
To enable goal of the invention, feature, the advantage of the present invention more obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that disclosed below
Embodiment be only part of the embodiment of the present invention, and not all embodiment.Based on the embodiment in the present invention, this area
All other embodiment that those of ordinary skill is obtained under the premise of creative work is not made, belongs to protection of the present invention
Scope.
A kind of referring to Fig. 1, side that current transformer electrical-magnetic model parameter is verified with direct current method provided by the invention
One embodiment of method, including：
101st, cause the core sataration of current transformer to the primary side application DC current of current transformer, surveyed
Secondary side current waveform；
It should be noted that applying DC current suddenly to the primary side of current transformer in step 101 make it that electric current is mutual
The core sataration of sensor, obtain surveying secondary side current waveform.
102nd, the current transformer model corresponding with current transformer got, and to the one of current transformer model
Secondary side applies DC current, obtains emulating secondary side current waveform；
In the present embodiment, to entity in the DC current and step 101 that apply to the primary side of current transformer model
The size for the DC current that current transformer applies is identical with process.
103rd, judge whether survey secondary side current waveform and the deviation of emulation secondary side current waveform is more than preset distortion
Value, if being more than, determines that the parameter of current transformer model is unqualified, if being not more than, determines that the parameter of current transformer model is closed
Lattice.
Real-time transient response and simulated current transformer of the present invention with comparison entity current transformer impact DC current
Based on the real-time transient response of model impact DC current, the ginseng of protective current transformer, electromagnetic transient simulation model is verified
Number, the Simulation of current transformer model established with this are had the transient response performance highly consistent with prototype, can be greatly enhanced
The degree of accuracy of current transformer transient state progress of disease Performance Analysis.
It is above a kind of one embodiment for the method that current transformer electrical-magnetic model parameter is verified with direct current method, is
More specific description is carried out, a kind of the another of method that current transformer electrical-magnetic model parameter is verified with direct current method is provided below
One embodiment, a kind of current transformer electrical-magnetic model parameter is verified with direct current method referring to Fig. 2, provided by the invention
Another embodiment of method, including：
201st, cause the core sataration of current transformer to the primary side application DC current of current transformer, surveyed
Secondary side current waveform；
It should be noted that the current transformer in step 201 is entity current transformer, the current transformer is once
Side is connected with DC current generator, and secondary side is connected with the adjustable resistance as secondary load.
202nd, the primary circuit parameter and secondary circuit ginseng during applying DC current to current transformer are got
Number；
203rd, the dc source model established according to primary circuit parameter, secondary circuit parameter in l-G simulation test model, one
Subsystem Resistance model for prediction, primary system reactance model, breaker model, breaker control submodel, secondary load model and ripple
Shape records and output submodel；
Imitated it is understood that being established in electromagnetic transient simulation software according to primary circuit parameter, secondary circuit parameter
True test model, dc source model, primary system Resistance model for prediction, primary system reactance model, breaker mould in the model
Type, breaker control submodel, the parameter of secondary load model are consistent with primary circuit parameter, secondary circuit parameter, i.e., should
The primary circuit of l-G simulation test model, the parameter of secondary circuit and the primary circuit parameter and secondary circuit obtained in step 202
Parameter is consistent.
204th, current transformer model is established according to the excitation property of current transformer by parameter identification computational methods；
In the present embodiment, the excitation property of current transformer model and the excitation property of current transformer are corresponding, its
In, excitation property includes C-V characteristic and magnetization curve.It is special according to the excitation of current transformer by parameter identification computational methods
It is prior art in the art that property, which establishes current transformer model, and the calculating process repeats no more.
205th, l-G simulation test model is run, direct current is applied to the primary side of current transformer model by dc source model
Electric current, obtain emulating secondary side current waveform；
It should be noted that process of the process of l-G simulation test with applying DC current to entity current transformer primary side
It is similar, open dc source model and cause dc source model to apply DC current to the primary side of current transformer model.
It is understood that the primary system in l-G simulation test applies DC current completely in accordance with entity current transformer
Test identical parameter to establish, therefore the primary current size of l-G simulation test application and process and full-scale test are consistent.
206th, to start to apply DC current as with reference to the moment at the time of, actual measurement secondary side current waveform is raised to from above freezing
Point during 30% peak value will survey point of the secondary side current waveform from peak-fall to 30% peak value as taking as sampling starting point
Sample terminal, then using the section sampled between starting point and sampling terminal as sampling range, the actual measurement two being pointed in sampling range
Secondary side current waveform and emulation secondary side current waveform are sampled point by point, obtain measured current sequence and simulated current sequence,
Judge whether the deviation between measured current sequence and simulated current sequence is more than preset distortion value by preset formula, if greatly
In determining that the parameter of current transformer model is unqualified, if being not more than, determine that the parameter of current transformer model is qualified.
In the present embodiment, preset distortion value is 0.1.It should be noted that the determination of step 206 sampling range is with reality
It is determined on the basis of survey secondary side current waveform, is specifically raised to 30% peak value from above freezing to survey secondary side current waveform
When point as sampling starting point, point of the secondary side current waveform from peak-fall to 30% peak value will be surveyed as sampling terminal,
Again using it is described sampling starting point and it is described sampling terminal between section as sampling range, then to survey secondary side current waveform,
All numerical value that emulation secondary side current waveform is located in the sampling range are sampled.
Wherein, preset formula is：
Wherein, R is deviation, AnFor measured current sequence, BnFor simulated current sequence, N is total points of sampling.
The embodiments of the invention provide it is a kind of with direct current method verify current transformer electrical-magnetic model parameter method, with
The real-time transient response of comparison entity current transformer impact DC current and simulated current transformer model impact DC current
Real-time transient response based on, verify protective current transformer, electromagnetic transient simulation model parameter, the electricity established with this
Current transformer simulation model has the transient response performance highly consistent with prototype.Using the present invention, electric current can be greatly enhanced
The degree of accuracy of transformer transient progress of disease Performance Analysis.
Because the saturation flux density of protective current transformer, is higher, such as using conventional application industrial frequency AC electric current or
Alternating current is superimposed the method for aperiodic component, it is necessary to apply more than ten times to tens times of rated current, is generally relatively difficult to reality
Apply.By contrast, the lower current transformer core of impact DC current effect is more easy to saturation, and the DC current of required application is general not
More than rated current, therefore this test method shows for the Transient simulation model parameter for verifying protective current transformer,
So it is more easily performed, also can more accurately reflects that transformer iron core is operated in the situation of magnetization curve non-linear section.
Referring to Fig. 3, the embodiment of the present invention additionally provides one kind direct current method verification current transformer electrical-magnetic model
The system of parameter, including：DC current generator 301, adjustable resistance 302, current transformer 303, wave tracer 304 and electricity
Magnetic transient emulation terminal 305；
DC current generator 301 is connected with the primary side of current transformer 303；
Adjustable resistance 302 is connected with the secondary side of current transformer 303；
The summation current transformer 303 of wave tracer 304 connects, and wave tracer 304 is used to show and record current mutual inductance
The current waveform of device；
Electromagnetic transient simulation terminal 305 is connected with wave tracer 304；
DC current generator 301 is used to cause current transformer to the primary side application DC current of current transformer
Core sataration, obtain surveying secondary side current waveform；
Electromagnetic transient simulation terminal 305 is used for the current transformer model corresponding with current transformer got, and
Apply DC current to the primary side of current transformer model, obtain emulating secondary side current waveform；
Electromagnetic transient simulation terminal 305 is additionally operable to judge actual measurement secondary side current waveform with emulating secondary side current waveform
Whether deviation is more than preset distortion value, if being more than, determines that the parameter of current transformer model is unqualified, if being not more than, it is determined that electric
The parameter of current transformer model is qualified.
In the present embodiment, the excitation property of current transformer model and the excitation property of current transformer are corresponding, its
In, excitation property includes C-V characteristic and magnetization curve.
In the present embodiment, electromagnetic transient simulation terminal 305 is specifically additionally operable to：
Get the primary circuit parameter and secondary circuit parameter during applying DC current to current transformer；
The dc source model established according to primary circuit parameter, secondary circuit parameter in l-G simulation test model, it is once
System Resistance model for prediction, primary system reactance model, breaker model, breaker control submodel, secondary load model and waveform note
Record and output submodel；
Current transformer model is established according to the excitation property of current transformer by parameter identification computational methods；
L-G simulation test model is run, direct current is applied to the primary side of current transformer model by dc source model
Stream, obtain emulating secondary side current waveform.
In the present embodiment, electromagnetic transient simulation terminal 305 is additionally operable to two electric currents using numerical value as 30% current peak
It is worth for basic point, actual measurement secondary side current waveform is taken with the current value that emulates between two basic points of secondary side current waveform
Sample, measured current sequence and simulated current sequence are obtained, measured current sequence and simulated current sequence are judged by preset formula
Between deviation whether be more than preset distortion value, if being more than, determine that the parameter of current transformer model is unqualified, if being not more than,
Determine that the parameter of current transformer model is qualified；
Wherein, preset formula is：
Wherein, R is deviation, AnFor measured current sequence, BnFor simulated current sequence, N is total points of sampling.
In the present embodiment, preset distortion value is 0.1.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, the corresponding process in preceding method embodiment is may be referred to, will not be repeated here.
In several embodiments provided herein, it should be understood that disclosed system, apparatus and method can be with
Realize by another way.For example, device embodiment described above is only schematical, for example, the unit
Division, only a kind of division of logic function, can there is other dividing mode, such as multiple units or component when actually realizing
Another system can be combined or be desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or
The mutual coupling discussed or direct-coupling or communication connection can be the indirect couplings by some interfaces, device or unit
Close or communicate to connect, can be electrical, mechanical or other forms.
The unit illustrated as separating component can be or may not be physically separate, show as unit
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and is used as independent production marketing or use
When, it can be stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially
The part to be contributed in other words to prior art or all or part of the technical scheme can be in the form of software products
Embody, the computer software product is stored in a storage medium, including some instructions are causing a computer
Equipment (can be personal computer, server, or network equipment etc.) performs the complete of each embodiment methods described of the present invention
Portion or part steps.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
Described above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before
Embodiment is stated the present invention is described in detail, it will be understood by those within the art that：It still can be to preceding
State the technical scheme described in each embodiment to modify, or equivalent substitution is carried out to which part technical characteristic；And these
Modification is replaced, and the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
- A kind of 1. method that current transformer electrical-magnetic model parameter is verified with direct current method, it is characterised in that including：S1：Cause the core sataration of the current transformer to the primary side application DC current of current transformer, surveyed Secondary side current waveform；S2：The current transformer model corresponding with the current transformer got, and to the current transformer model Primary side apply the DC current, obtain emulating secondary side current waveform；S3：Judge whether the deviation of the actual measurement secondary side current waveform and the emulation secondary side current waveform is inclined more than preset Difference, if being more than, determine that the parameter of the current transformer model is unqualified, if being not more than, determine the current transformer mould The parameter of type is qualified.
- 2. the method according to claim 1 that current transformer electrical-magnetic model parameter is verified with direct current method, its feature It is, the excitation property of the current transformer model is corresponding with the excitation property of the current transformer, wherein, it is described to encourage Magnetic characteristic includes C-V characteristic and magnetization curve.
- 3. the method according to claim 2 that current transformer electrical-magnetic model parameter is verified with direct current method, its feature It is, step S2 is specifically included：S201：Get the primary circuit parameter and secondary returning during applying the DC current to the current transformer Road parameter；S202：The dc source mould established according to the primary circuit parameter, the secondary circuit parameter in l-G simulation test model Type, primary system Resistance model for prediction, primary system reactance model, breaker model, breaker control submodel, secondary load model With waveform recording and output submodel；S203：The current transformer mould is established according to the excitation property of the current transformer by parameter identification computational methods Type；S204：Run the l-G simulation test model, by the dc source model to the current transformer model once Side applies the DC current, obtains emulating secondary side current waveform.
- 4. the method according to claim 1 that current transformer electrical-magnetic model parameter is verified with direct current method, its feature It is, step S3 is specifically included：As with reference to the moment at the time of to start to apply the DC current, actual measurement secondary side current waveform is raised to 30% from above freezing It is whole as sampling will to survey point of the secondary side current waveform from peak-fall to 30% peak value as sampling starting point for point during peak value Point, then using the section between the sampling starting point and the sampling terminal as sampling range, be pointed in the sampling range The actual measurement secondary side current waveform and it is described emulation secondary side current waveform sampled point by point, obtain measured current sequence With simulated current sequence, judge that the deviation between the measured current sequence and the simulated current sequence is by preset formula It is no to be more than preset distortion value, if being more than, determine that the parameter of the current transformer model is unqualified, if being not more than, it is determined that described The parameter of current transformer model is qualified；Wherein, the preset formula is：<mrow> <mi>R</mi> <mo>=</mo> <msqrt> <mrow> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mo>&Sigma;</mo> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msup> <mrow> <mo>(</mo> <mfrac> <mrow> <msub> <mi>B</mi> <mi>n</mi> </msub> <mo>-</mo> <msub> <mi>A</mi> <mi>n</mi> </msub> </mrow> <msub> <mi>A</mi> <mi>n</mi> </msub> </mfrac> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mrow> </msqrt> </mrow>Wherein, R is deviation, AnFor measured current sequence, BnFor simulated current sequence, N is total points of sampling.
- 5. the method according to claim 4 that current transformer electrical-magnetic model parameter is verified with direct current method, its feature It is, the preset distortion value is 0.1.
- A kind of 6. system that current transformer electrical-magnetic model parameter is verified with direct current method, it is characterised in that including：Direct current Flow-generator, adjustable resistance, current transformer, wave tracer and electromagnetic transient simulation terminal；The DC current generator is connected with the primary side of the current transformer；The adjustable resistance is connected with the secondary side of the current transformer；The wave tracer connects with the current transformer；The electromagnetic transient simulation terminal is connected with the wave tracer；The DC current generator is used to make it that the electric current is mutual to the primary side application DC current of the current transformer The core sataration of sensor, obtain surveying secondary side current waveform；The electromagnetic transient simulation terminal is used for the current transformer model corresponding with the current transformer got, and Apply the DC current to the primary side of the current transformer model, obtain emulating secondary side current waveform；The electromagnetic transient simulation terminal is additionally operable to judge the actual measurement secondary side current waveform and the emulation secondary side current Whether the deviation of waveform is more than preset distortion value, if being more than, determines that the parameter of the current transformer model is unqualified, if less In determining that the parameter of the current transformer model is qualified.
- 7. the system according to claim 6 that current transformer electrical-magnetic model parameter is verified with direct current method, its feature It is, the excitation property of the current transformer model is corresponding with the excitation property of the current transformer, wherein, it is described to encourage Magnetic characteristic includes C-V characteristic and magnetization curve.
- 8. the system according to claim 7 that current transformer electrical-magnetic model parameter is verified with direct current method, its feature It is, the electromagnetic transient simulation terminal is specifically additionally operable to：Get the primary circuit parameter and secondary circuit ginseng during applying the DC current to the current transformer Number；The dc source model established according to the primary circuit parameter, the secondary circuit parameter in l-G simulation test model, one Subsystem Resistance model for prediction, primary system reactance model, breaker model, breaker control submodel, secondary load model and ripple Shape records and output submodel；The current transformer model is established according to the excitation property of the current transformer by parameter identification computational methods；The l-G simulation test model is run, is applied by the dc source model to the primary side of the current transformer model The DC current, obtain emulating secondary side current waveform.
- 9. the system according to claim 6 that current transformer electrical-magnetic model parameter is verified with direct current method, its feature It is, as with reference to the moment at the time of electromagnetic transient simulation terminal is additionally operable to start to apply the DC current, will surveys Secondary side current waveform from it is above freezing be raised to 30% peak value when point as sampling starting point, will actual measurement secondary side current waveform from peak value Drop to the point of 30% peak value as sampling terminal, then using the section between the sampling starting point and the sampling terminal as taking Sample section, the actual measurement secondary side current waveform being pointed in the sampling range and the emulation secondary side current waveform enter The point-by-point sampling of row, obtains measured current sequence and simulated current sequence, by preset formula judge the measured current sequence with Whether the deviation between the simulated current sequence is more than preset distortion value, if being more than, determines the current transformer model Parameter is unqualified, if being not more than, determines that the parameter of the current transformer model is qualified；Wherein, the preset formula is：<mrow> <mi>R</mi> <mo>=</mo> <msqrt> <mrow> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mo>&Sigma;</mo> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msup> <mrow> <mo>(</mo> <mfrac> <mrow> <msub> <mi>B</mi> <mi>n</mi> </msub> <mo>-</mo> <msub> <mi>A</mi> <mi>n</mi> </msub> </mrow> <msub> <mi>A</mi> <mi>n</mi> </msub> </mfrac> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mrow> </msqrt> </mrow>Wherein, R is deviation, AnFor measured current sequence, BnFor simulated current sequence, N is total points of sampling.
- 10. the system according to claim 9 that current transformer electrical-magnetic model parameter is verified with direct current method, its feature It is, the preset distortion value is 0.1.
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