CN206960634U - Measure transformer core material hysteresis loop line equipment therefor under harmonic excitation - Google Patents
Measure transformer core material hysteresis loop line equipment therefor under harmonic excitation Download PDFInfo
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- CN206960634U CN206960634U CN201720559375.0U CN201720559375U CN206960634U CN 206960634 U CN206960634 U CN 206960634U CN 201720559375 U CN201720559375 U CN 201720559375U CN 206960634 U CN206960634 U CN 206960634U
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Abstract
It the utility model is related to transformer core material hysteresis loop line equipment therefor under measurement harmonic excitation, it is characterised in that the device includes signal generator, power amplifier, transformer fe core model, power analyzer and recording equipment；Signal generator is connected by wire with the input of power amplifier, the output end of power amplifier is connected by wire with the current input terminal of power analyzer, the current output terminal of power analyzer is connected by wire with the magnetizing coil of transformer fe core model, and the magnetizing coil of transformer fe core model is connected by wire with the output end of power amplifier；The voltage output input of power analyzer is connected by wire with the both ends of the measuring coil of transformer fe core model, and power analyzer is connected by wire with recording equipment；Wherein transformer fe core model includes laminated core, magnetizing coil and measuring coil.
Description
Technical field
The measurement of transformer B-H loop is the utility model is related to, is specifically transformer core under a kind of measurement harmonic excitation
Material hysteresis loop line equipment therefor.
Background technology
With the high speed development of China's power system and the extensive use of power electronic devices, the harmonic problem of transformer
Getting worse.Transformer can produce when being run in the environment of harmonic excitation and largely be lost and generate heat, have a strong impact on transformation
The service life of device and the safe operation of power network.Research harmonic excitation condition is set to the influence caused by transformer for electromagnetism
Meter and structure optimization and the safe operation of power network have great importance.
Traditional hysteresis measurement method, such as traditional epstein frame measuring method and annular exemplar mensuration method
For typically with the sinusoidal excitation condition of standard, and the data measured at the standard conditions are due to have ignored Transformer Winding
Kelvin effect and transformer core influence of the eddy current effect to hysteresis curve, it is impossible to be used in the harmonic wave of transformer core swashs
Encourage in problem, the measurement of the hysteresis curve of transformer core is more complicated under harmonic excitation.In Electromagnetic Calculation, simply use
The magnetization curve of material substitutes hysteresis curve, it is impossible to accurately reflects the actual electromagnetic process of material, can cause certain error.
In order to reduce influence of the harmonic excitation to transformer, it is necessary to by accurate measurement, the hysteresis characteristic of transformer fe core material is obtained,
The hysteresis curve for especially obtaining the harmonic excitation lower core material for meeting voltage device real work situation is even more important.
In traditional hysteresis measurement method, such as chinese national standard：GB/T3655-2000《With Epstein side
The method of circle measurement electrical sheet (band) magnetic property》, epstein frame is made up of 4 coils, and print to be measured is inserted,
Square magnetic circuit is formed in the form of double overlap joints, magnetic induction intensity and magnetic can be measured according to the law of electromagnetic induction and Ampere ring road rule
Field intensity, but on condition that require to be evenly distributed along the magnetic field of magnetic circuit everywhere, epstein frame measuring method application is very wide
It is general, but many deficiencies be present：It is required that using the electrical sheet print of given size, all required for quality and quantity；And have
The effect length of magnetic path can not be determined accurately.
Annular exemplar mensuration is different from epstein frame method, and obtained magnetization characteristic is average flux density and magnetic field
Relation between intensity, magnetic flux density is measured also according to the law of electromagnetic induction, electric current is obtained using electric-resistivity method and then calculates magnetic
Field intensity size, but equally exist many deficiencies：Due to being had differences inside and outside annular exemplar between the length of magnetic path so that method
Not removable error component inherently be present；Compared with epstein frame method with annular exemplar method measure magnetic characteristic more
Difference, exemplar may be caused stress to be present due to partial annealing, the destruction of exemplar layer insulation causes vortex to occur, can not be accurate
The determination length of magnetic path.
Utility model content
In view of the shortcomings of the prior art, the technical problem that the utility model intends to solve is：There is provided and become under a kind of harmonic excitation
The measuring method of depressor core material hysteresis curve, the actual conditions that this method works according to power transformer, simulation harmonic wave swash
Condition of work under encouraging, hysteresis curve of the transformer fe core material under harmonic excitation thus being measured, this method is more accurate, and
There is no the application in earth's magnetic field.
Technical scheme is used by the utility model solves described problem：
Transformer core material hysteresis loop line equipment therefor under one kind measurement harmonic excitation, it is characterised in that the device includes
Signal generator, power amplifier, transformer fe core model, power analyzer and recording equipment；Signal generator passes through wire
It is connected with the input of power amplifier, the current input terminal phase that the output end of power amplifier passes through wire and power analyzer
Even, the current output terminal of power analyzer is connected by wire with the magnetizing coil of transformer fe core model, transformer fe core
The magnetizing coil of type is connected by wire with the output end of power amplifier；The voltage output input of power analyzer is by leading
Line is connected with the both ends of the measuring coil of transformer fe core model, and power analyzer is connected by wire with recording equipment；Wherein
Transformer fe core model includes laminated core, magnetizing coil and measuring coil；Two transformer fe core models are used during measurement, point
Do not accessed according to above-mentioned connected mode in circuit, measure two groups of data, magnetizing coil is a side line in transformer fe core model
Circle, measuring coil is second siding ring.
The measuring method of transformer core material hysteresis loop line under a kind of harmonic excitation is as follows the step of this method：
A, make device used in transformer core material hysteresis go-and-return measurement method under harmonic excitation：
Mainly using signal generator, power amplifier, transformer fe core model, power analyzer, recording equipment press with
Under connect and compose the measuring method equipment therefor of transformer core material hysteresis loop line under the harmonic excitation of the present embodiment；Signal is sent out
Raw device is connected by wire with the input of power amplifier, and the output end of power amplifier passes through wire and power analyzer
Current input terminal is connected, and the current output terminal of power analyzer is connected by wire with the magnetizing coil of transformer fe core model,
The magnetizing coil of transformer fe core model is connected by wire with the output end of power amplifier；The voltage output of power analyzer
Input is connected by wire with the both ends of the measuring coil of transformer fe core model, and power analyzer is set by wire and record
It is standby to be connected；Wherein transformer fe core model includes laminated core, magnetizing coil and measuring coil；Two transformers are used during measurement
Iron core model, access in the manner described above in circuit respectively, measure two groups of data, two transformer core mould shapes structure phases
Together, size is different, size it is big for big transformer fe core model, big transformer fe core model is measurand, size it is small be
Small transformers iron core model；Magnetizing coil is first siding ring in transformer fe core model, and measuring coil is second siding ring；
B, the dress used in the measuring method of transformer core material hysteresis loop line under the harmonic excitation made by step A
Put, obtain fundamental voltage amplitude according to the following steps in the range of 0~400v, any given alternate current operation point and any time, any content
The hysteresis curve of tested big transformer fe core model during harmonic wave collective effect；
The first step, harmonic excitation is given, determine the phase difference θ of fundamental wave and harmonic wave, two changes are then determined according to formula (1)
Magnetic close B', B corresponding to the input voltage of depressor iron core model1It is close for base time magnetic；
B '=B1sin(100πt)+knB1sin(n(100πt-Δθ)) (1)
Wherein knThe content and number of harmonic wave are respectively superimposed with n；
Second step, according to Faraday's electromagnetic induction law, corresponding driving voltage E is obtained using formula (2), by excitation electricity
Pressure E is input in signal generator,
E=100 π NSB1cos(100πt)-100πnknNSB1cos(n(100πt-Δθ)) (2)
Wherein fundamental voltage is E1=-100 π NSB1Cos (100 π t), N are the measuring coil circle of big transformer fe core model
Number, S are that the effective cross section of big transformer fe core model is accumulated；
3rd step, big transformer fe core model and small transformers iron core model are respectively connected in step A device, passed through
Power analyzer measure respectively fundamental voltage amplitude be in the range of 0~400v any given alternate current operation point with it is any secondary, arbitrarily contain
Measure total losses P during harmonic wave collective effectaAnd Pb；
4th step, if big transformer core model center region is homogeneity range, corner part is non-uniform area, then will become greatly
The homogeneity range of depressor iron core model regards the center section that big transformer fe core model subtracts each other with small transformers iron core model as, big to become
The non-uniform area of depressor iron core model regards small transformers iron core model as, takes one-level weighting method to try to achieve big change according to formula (3)
The accurate effective magnetic circuit length L of depressor iron core modele,
Le=α lm1+β·lm2 (3)
Weight α, β are calculated by formula (4),
Corresponding big transformer fe core model lm1With small transformers iron core model effective magnetic circuit length lm2Calculated by formula (5)
Obtain,
Wherein mtFor the gross mass of big transformer fe core model, l is the laminated core length of big transformer fe core model,
Ploss1And Ploss2The specific loss of respectively big transformer fe core model and small transformers iron core model, specific loss are calculated by formula (6)
Obtain,
Wherein mdFor total effective mass of laminated core in big transformer fe core model, maFor in small transformers iron core model
Total effective mass of laminated core；
5th step, by power analyzer measure fundamental voltage amplitude in the range of 0~400v any given alternate current operation point with
Any time, any content harmonic wave collective effect when, when t=0, record the excitatory of big transformer fe core model every Δ t
The exciting curent i of coil data, while the number of the induced voltage e of the measuring coil of big transformer fe core model corresponding to record
According to, altogether record q group data；
6th step, the big transformer fe core model is calculated using formula (7) for the induced voltage e that the 5th pacing measures
Magnetic induction density B, obtain T cycle intrinsic inductances B waveform, T=Δ tq,
Wherein N is the number of turn of the measuring coil of big transformer fe core model, and S is the effective transversal of big transformer fe core model
Area, e are the induced voltage that the 5th step obtains；
7th step, bring the exciting current i that the 5th step obtains into formulas (8), the magnetic field for calculating big transformer fe core model is strong
Spend H,
8th step, the magnetic induction density B obtained according to the 7th step and the 8th step and magnetic field intensity H, it is same as the cycle using T
Moment B-H is one group of data pair, is drawn, and obtains the hysteresis curve of big transformer fe core model under given harmonic excitation, i.e.,
Obtain the hysteresis curve of transformer fe core material under harmonic excitation.
Compared with prior art, the beneficial effects of the utility model are：
Due to the joint form that iron core model is overlapped using full bias seam, every grade of two panels, three-level stepping 5mm, overlap
Magnetic circuit is uneven, if equivalent magnetic circuit length takes definite value, can make it that the calculating of magnetic field intensity is inaccurate；The utility model harmonic wave swashs
Iron core corner field amount is considered in the determination for encouraging effective magnetic circuit length in the measuring method of lower transformer core material hysteresis loop line
Influence of the inhomogeneities of distribution to measurement result, it is close according to different magnetic, using the method for weighting, the effective magnetic circuit of dynamic calculation
Length, make the calculating of magnetic field intensity more accurate.
Because the measuring method of transformer core material hysteresis loop line under the utility model harmonic excitation becomes in view of electric power
Depressor running situation under the operating mode of nonsinusoidal excitation, using the form of harmonic excitation, resulting magnetic flux and hysteresis curve phase
The measurement data that more traditional single sheet measurement system and epstein frame measurement apparatus obtains under standard sine excitation is more
Magnetic characteristic when being worked close to transformer fe core material under harmonic excitation.The utility model method is to transformer in core material
Three-dimensional FEM simulation analysis calculating it is more accurate, also there is directive significance to the optimization design of transformer iron-core structure.
Brief description of the drawings
Fig. 1 is the measuring method equipment therefor principle of transformer core material hysteresis loop line under the utility model harmonic excitation
Figure.
Fig. 2 is the big transformation used in the measuring method of transformer core material hysteresis loop line under the utility model harmonic excitation
The structural representation of device iron core model.
Fig. 3 is the big transformation used in the measuring method of transformer core material hysteresis loop line under the utility model harmonic excitation
The laminated core cross-sectional view of device iron core model.
Fig. 4 is the big transformation used in the measuring method of transformer core material hysteresis loop line under the utility model harmonic excitation
The magnetizing coil of device iron core model and measuring coil cross-sectional view.
Fig. 5 is the small transformation used in the measuring method of transformer core material hysteresis loop line under the utility model harmonic excitation
The structural representation of device iron core model.
Fig. 6 be in the utility model embodiment 1 when fundamental voltage amplitude is 93V, be superimposed 30% triple-frequency harmonics, and harmonic wave with
During fundamental phase difference Δ θ=π/6, the hysteresis curve of transformer fe core material.
Fig. 7 be in the utility model embodiment 2 when fundamental voltage amplitude is 93V, be superimposed 30% triple-frequency harmonics, and harmonic wave with
During fundamental phase difference Δ θ=0 °, the hysteresis curve of transformer fe core material.
Fig. 8 be in the utility model embodiment 3 when fundamental voltage amplitude is 93V, be superimposed 30% quintuple harmonics, and harmonic wave with
During fundamental phase difference Δ θ=0 °, the hysteresis curve of transformer fe core material.
In figure:1. signal generator, 2. power amplifiers, 3. transformer fe core models, 4. magnetizing coils, 5. measurement lines
Circle, 6. power analyzers, 7. recording equipments, 8. coils, 9. laminated cores.
Embodiment
The utility model is explained further with reference to embodiment and accompanying drawing, but is not wanted in this, as to the application right
Ask the restriction of protection domain.
The measuring method of transformer core material hysteresis loop line, its step are as follows under the utility model harmonic excitation：
A, make device used in transformer core material hysteresis go-and-return measurement method under harmonic excitation：
Mainly using signal generator 1, power amplifier 2, transformer fe core model 3, power analyzer 6, recording equipment 7
By the measuring method equipment therefor of transformer core material hysteresis loop line under the following harmonic excitation for connecting and composing the present embodiment；Letter
Number generator 1 is connected by wire with the input of power amplifier 2, and the output end of power amplifier passes through wire and power point
The current input terminal of analyzer 6 is connected, and the current output terminal of power analyzer passes through wire and the excitatory line of transformer fe core model
Circle 4 is connected, and the magnetizing coil 4 of transformer fe core model is connected by wire with the output end of power amplifier 2；Power analyzer
Voltage output input be connected by wire with the both ends of the measuring coil 5 of transformer fe core model, power analyzer 6 passes through
Wire is connected with recording equipment 7, records measurement data；Wherein transformer fe core model 3 include laminated core 9, magnetizing coil and
Measuring coil 5；Two transformer fe core models 3 are used during measurement, are accessed in the manner described above in circuit respectively, measure two groups of numbers
According to, two transformer core mould shapes structures are identical, and size is different, size it is big for big transformer fe core model, big transformation
Device iron core model is measurand, and size is small for small transformers iron core model；Transformer fe core described in the utility model
Type is the Product-level model formed according to the standard technology closed assembly of actual electrical transformer cores, is swashed in transformer fe core model
Magnetic coil is first siding ring, and measuring coil is second siding ring；
B, the dress used in the measuring method of transformer core material hysteresis loop line under the harmonic excitation made by step A
Put, obtain fundamental voltage amplitude according to the following steps in the range of 0~400v, any given alternate current operation point and any time, any content
The hysteresis curve of tested big transformer fe core model during harmonic wave collective effect；
The first step, harmonic excitation is given, determine the phase difference θ of fundamental wave and harmonic wave, two changes are then determined according to formula (1)
Magnetic close B', B corresponding to the input voltage of depressor iron core model1It is close for base time magnetic；
B '=B1sin(100πt)+knB1sin(n(100πt-Δθ)) (1)
Wherein knThe content and number of harmonic wave are respectively superimposed with n；
Second step, according to Faraday's electromagnetic induction law, corresponding driving voltage E is obtained using formula (2), by excitation electricity
Pressure E is input in signal generator 1,
E=100 π NSB1cos(100πt)-100πnknNSB1cos(n(100πt-Δθ)) (2)
Wherein fundamental voltage is E1=-100 π NSB1Cos (100 π t), N are the circle of measuring coil 5 of big transformer fe core model
Number, S are that the effective cross section of big transformer fe core model is accumulated；
3rd step, big transformer fe core model and small transformers iron core model are respectively connected in step A device, passed through
Power analyzer 6 measure respectively fundamental voltage amplitude be in the range of 0~400v any given alternate current operation point with it is any secondary, arbitrarily contain
Measure total losses P during harmonic wave collective effectaAnd Pb；
4th step, it is contemplated that influence of the inhomogeneities of iron core corner field amount distribution to measurement result, if big transformer
Iron core model center region is homogeneity range, and corner part is non-uniform area, then the homogeneity range of big transformer fe core model can be regarded as
The center section that big transformer fe core model subtracts each other with small transformers iron core model, the non-uniform area of big transformer fe core model can
Regard small transformers iron core model as, take one-level weighting method according to formula (3) to try to achieve big transformer fe core model accurately effective
Length of magnetic path Le,
Le=α lm1+β·lm2 (3)
Weight α, β are calculated by formula (4),
Corresponding big transformer fe core model lm1With small transformers iron core model effective magnetic circuit length lm2Calculated by formula (5)
Obtain,
Wherein mtFor the gross mass of big transformer fe core model, l is the laminated core length of big transformer fe core model,
Ploss1And Ploss2The specific loss of respectively big transformer fe core model and small transformers iron core model, specific loss are calculated by formula (6)
Obtain,
Wherein mdFor total effective mass of laminated core in big transformer fe core model, maFor in small transformers iron core model
Total effective mass of laminated core；
5th step, by power analyzer measure fundamental voltage amplitude in the range of 0~400v any given alternate current operation point with
Any time, any content harmonic wave collective effect when, when t=0, record the excitatory of big transformer fe core model every Δ t
The exciting curent i of coil data, while the number of the induced voltage e of the measuring coil of big transformer fe core model corresponding to record
According to, altogether record q group data；
6th step, the big transformer fe core model is calculated using formula (7) for the induced voltage e that the 5th pacing measures
Magnetic induction density B, obtain T cycle intrinsic inductances B waveform, T=Δ tq,
Wherein N is the number of turn of the measuring coil 5 of big transformer fe core model, and S is effective horizontal stroke of big transformer fe core model
Sectional area, e are the obtained induced voltage of the 5th step, are integrated since t=0 integrates the moment, and step-length is Δ t, by q time step
Integration, T cycle intrinsic inductances B waveform can be obtained；
7th step, bring the exciting current i that the 5th step obtains into formulas (8), the magnetic field for calculating big transformer fe core model is strong
Spend H,
8th step, the magnetic induction density B obtained according to the 7th step and the 8th step and magnetic field intensity H, it is same as the cycle using T
Moment B-H is one group of data pair, is drawn, and obtains the hysteresis curve of big transformer fe core model under given harmonic excitation, i.e.,
Obtain the hysteresis curve of transformer fe core material under harmonic excitation.
The utility model method is further characterized by Δ t=0.1-0.5ms, q=200-400.
It is of the present utility model that to be further characterized by the transformer fe core model be the measurement for being close to laminated core coiling
Coil and magnetizing coil, and clamped with insulating part, laminated core is taken using 45 ° of full bias seams, every grade of two panels, three-level stepping 5mm
The stacking technique connect, measuring coil winding of single layer.
Transformer fe core model described in the utility model includes big transformer fe core model and small transformers iron core mould
Type, manufacture craft, cross-sectional area and the core material all same of the two, but the two iron yoke section length are different, big transformer core
The size of model is big, the iron yoke head of district, and the size of small transformers iron core model is small, and iron yoke area is short.In two transformer fe core models
Measuring coil and the number of turn of magnetizing coil winding can be the same or different.
Embodiment 1
Big transformer fe core model and small transformers iron core model are orientated using core material B30P105 in the present embodiment
Silicon steel sheet is made, and given fundamental voltage amplitude is 93V, is superimposed 30% triple-frequency harmonics, harmonic wave and fundamental phase difference Δ θ=π/6.Letter
The model WF1974, the model NF4520A of power amplifier, the model LMG500 of power analyzer of number generator.
A, make harmonic excitation under transformer core material hysteresis go-and-return measurement method equipment therefor, by signal generator,
Power amplifier, transformer fe core model, power analyzer, recording equipment are connected and composed the transformer fe of the present embodiment by Fig. 1
The measuring method equipment therefor of hysteresis curve under the harmonic excitation of core material.
Signal generator is connected by wire with power amplifier input, and power amplifier output passes through wire and work(
The current input terminal of rate analyzer is connected, and the current output terminal of power analyzer is excitatory by wire and transformer fe core model
Coil 4 is connected, and the magnetizing coil of transformer fe core model is connected by wire with the output end of power amplifier.Power analyzer
Voltage output input be connected by wire with the both ends of the measuring coil 5 of transformer fe core model, power analyzer passes through
Wire is connected with recording equipment, records measurement data.
Wherein transformer fe core model is the measuring coil and magnetizing coil for being close to iron core winding, and is clamped with insulating part.
The joint form that the iron core of the transformer fe core model is overlapped using 45 ° of full bias seams, every grade of two panels, three-level stepping 5mm, transformation
Device iron core model includes laminated core 9, magnetizing coil 4 and measuring coil 5, and measuring coil 5 and magnetizing coil 4 are referred to as coil 8.
Magnetizing coil line gauge isMeasuring coil line gauge isIron core cross-sectional area is 2.0 × 103mm2, measuring coil twines
Around the number of turn be 144 circles, winding of single layer.Wherein Fig. 2 is the structural representation of big transformer fe core model, and Fig. 2 shows, big transformation
A length of 800mm outside the silicon steel sheet of device iron core model, interior a length of 600mm, gross weight 41.55kg, Fig. 5 show that small transformers are folded
A length of 600mm outside the silicon steel sheet of piece iron core model, interior a length of 400mm, gross weight 29.68kg.Fig. 3 is big transformer fe core
The longitudinal profile of type, the peripheral wound around coil 8 of laminated core 9, the silicon of big transformer fe core model and small transformers iron core model
Steel disc goes out that size is identical, i.e., width is 110mm, is highly 26mm；Fig. 4 is the He of magnetizing coil 4 of big transformer fe core model
The thickness of the partial enlarged drawing of measuring coil 5, magnetizing coil 4 and measuring coil 5 is 8mm, magnetizing coil 4 and transformer core
Silicon steel sheet distance be 1mm.
B, filled with the transformer fe core material made by step A under harmonic excitation used in hysteresis measurement method
Put, obtain the triple-frequency harmonics that fundamental voltage amplitude is 30% with content when being 93V according to the following steps, phase difference is common when being Δ θ=π/6
The hysteresis curve of the tested big transformer fe core model of effect.
The first step, determine that magnetic is close according to (9) formula, calculate fundamental wave and be superimposed 30% triple-frequency harmonics, and fundamental wave and harmonic phase are poor
For Δ θ=π/6 when the close waveform of magnetic, determine that the magnetic corresponding to the input voltage of two transformer fe core models is close,
B '=B1Sin (100 π t)+30%B1sin(300πt-π/2) (9)
Second step, according to Faraday's electromagnetic induction law, corresponding driving voltage E waveform is obtained using formula (10), will
Driving voltage E is input in signal generator 1,
E=100 π NSB1cos(100πt)+90πNSB1cos(300πt-π/2) (10)
3rd step, big transformer fe core model is measured with small transformers iron core model in base by power analyzer 6 respectively
It is 30% triple-frequency harmonics that content is superimposed when wave amplitude is 93V, and fundamental wave and harmonic phase difference for Δ θ=π/6 when total losses Pn
And Ps,
4th step, if big transformer core model center region is homogeneity range, corner part is non-uniform area, then big transformation
The homogeneity range of device iron core model can regard the center section that big transformer fe core model subtracts each other with small transformers iron core model as, big to become
The non-uniform area of depressor iron core model can regard small transformers iron core model as, take one-level weighting method to try to achieve big transformer core
The accurate effective magnetic circuit length L of modele, such as shown in (3)
Le=α lm1+β·lm2 (3)
Weight α, β are calculated by (4) formula
Corresponding big transformer fe core model lm1With small transformers iron core model effective magnetic circuit length lm2Calculated by (5) formula
Wherein mtFor the gross mass of big transformer fe core model, l is the laminated core length of big transformer fe core model,
Ploss1And Ploss2The specific loss of respectively big transformer fe core model and small transformers iron core model, calculated by (6) formula
Wherein mdFor total effective mass of laminated core in big transformer fe core model, maFor in small transformers iron core model
Total effective mass of laminated core, is calculated LeFor 2.92m；
5th step, it is 30% triple-frequency harmonics subharmonic to measure fundamental voltage amplitude to be superimposed content in 93V by power analyzer,
And fundamental wave and harmonic phase difference for Δ θ=π/6 when corresponding driving voltage effect under above-mentioned big transformer fe core model swash
The exciting current i of magnetic coil data, when t=0, every 0.1ms record once, while record corresponding to big transformation
The induced voltage e of the measuring coil of device iron core model data, 200 groups of data are recorded altogether；
6th step, the magnetic induction of the big transformer fe core model is calculated using formula (7) for the e that the 5th pacing measures
Intensity B, obtains T cycle intrinsic inductances B waveform, T=20ms,
Wherein N is the number of turn of the measuring coil 5 of big transformer fe core model, and S is effective horizontal stroke of big transformer fe core model
Sectional area, e are the obtained induced voltage of the 5th step, are integrated since t=0 integrates the moment, step-length 0.1ms, during by 200
The integration of step, 20ms cycle intrinsic inductances B waveform can be obtained；
Wherein S is that the effective cross section of big transformer fe core model is accumulated；
7th step, the exciting current i obtained to the 5th step use formula (8), calculate the magnetic field of big transformer fe core model
Intensity H,
Wherein LeIt is that four-step calculation obtains the big accurate effective magnetic circuit length of transformer fe core model, N is big transformer
The number of turn of measuring coil 5 of iron core model；
8th step, the magnetic induction density B obtained according to the 7th step and the 8th step and magnetic field intensity H, using 20ms as the cycle
Synchronization B-H is one group of data pair, is drawn, you can it is 93V to obtain transformer fe core material B30P105 in fundamental voltage amplitude
When with 30% triple-frequency harmonics, and fundamental wave and harmonic phase difference is be superimposeds hysteresis curve under excitation, gained magnetic hysteresis time during Δ θ=π/6
For line as shown in fig. 6, abscissa is magnetic field intensity in Fig. 6, unit is peace/rice, and ordinate is magnetic induction intensity, unit for it is special this
Draw.
Embodiment 2
Big transformer fe core model and small transformers iron core model are orientated using core material B30P105 in the present embodiment
Silicon steel sheet is made, and given fundamental voltage amplitude is 93V, is superimposed 30% triple-frequency harmonics, harmonic wave and fundamental phase difference Δ θ=0 °.Its
Remaining step is same as above, and gained hysteresis curve is as shown in fig. 7, abscissa is magnetic field intensity in Fig. 7, and unit is peace/rice, and ordinate is magnetic
Induction, unit are tesla.
Embodiment 3
Big transformer fe core model and small transformers iron core model are orientated using core material B30P105 in the present embodiment
Silicon steel sheet is made, and given fundamental voltage amplitude is 93V, is superimposed 30% quintuple harmonics, harmonic wave and fundamental phase difference Δ θ=0 °.Its
Remaining step is same as above, and gained hysteresis curve is as shown in figure 8, abscissa is magnetic field intensity in Fig. 8, and unit is peace/rice, and ordinate is magnetic
Induction, unit are tesla.
Comparison diagram 6-8 understands that overtone order, content, the phase difference being superimposed with fundamental wave all can be to transformer fe core materials
Hysteresis curve makes a big impact, it is impossible to substitutes the hysteresis curve under complex working condition, the utility model with simple magnetization curve
Method uses device to be consistent with transformer real work situation, the hysteresis characteristic of the accurate measuring transformer core material of energy, obtains
The hysteresis curve of transformer fe core material can be applied to transformer device structure and optimize closer to actual value under the harmonic excitation obtained
With in emulation.
The utility model does not address part and is applied to prior art.
Claims (3)
1. transformer core material hysteresis loop line equipment therefor under one kind measurement harmonic excitation, it is characterised in that the device includes letter
Number generator, power amplifier, transformer fe core model, power analyzer and recording equipment；Signal generator by wire with
The input of power amplifier is connected, the current input terminal phase that the output end of power amplifier passes through wire and power analyzer
Even, the current output terminal of power analyzer is connected by wire with the magnetizing coil of transformer fe core model, transformer fe core
The magnetizing coil of type is connected by wire with the output end of power amplifier；The voltage output input of power analyzer is by leading
Line is connected with the both ends of the measuring coil of transformer fe core model, and power analyzer is connected by wire with recording equipment；Wherein
Transformer fe core model includes laminated core, magnetizing coil and measuring coil, and magnetizing coil is once in transformer fe core model
Lateral coil, measuring coil are second siding ring.
2. transformer core material hysteresis loop line equipment therefor under measurement harmonic excitation according to claim 1, its feature
It is the measuring coil and magnetizing coil for being close to laminated core coiling to be the transformer fe core model, and is clamped with insulating part,
The stacking technique that laminated core is overlapped using 45 ° of full bias seams, every grade of two panels, three-level stepping 5mm, measuring coil winding of single layer.
3. transformer core material hysteresis loop line equipment therefor under measurement harmonic excitation according to claim 1, its feature
It is the model WF1974 of the signal generator, the model NF4520A of power amplifier, the model of power analyzer
LMG500。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110531288A (en) * | 2019-09-26 | 2019-12-03 | 武汉钢铁有限公司 | A kind of epstein frame magnetic property detection device and method |
| CN112051526A (en) * | 2020-07-22 | 2020-12-08 | 中国电力科学研究院有限公司 | Test platform and method for testing excitation characteristics of transformer model |
| CN114660370A (en) * | 2022-05-20 | 2022-06-24 | 保定天威保变电气股份有限公司 | Copper magnetic shielding measuring device under harmonic and direct current combined excitation |
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2017
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110531288A (en) * | 2019-09-26 | 2019-12-03 | 武汉钢铁有限公司 | A kind of epstein frame magnetic property detection device and method |
| CN110531288B (en) * | 2019-09-26 | 2021-05-25 | 武汉钢铁有限公司 | Epstein square ring magnetic property detection device and method |
| CN112051526A (en) * | 2020-07-22 | 2020-12-08 | 中国电力科学研究院有限公司 | Test platform and method for testing excitation characteristics of transformer model |
| CN112051526B (en) * | 2020-07-22 | 2023-08-18 | 中国电力科学研究院有限公司 | Test platform and method for testing excitation characteristics of transformer model |
| CN114660370A (en) * | 2022-05-20 | 2022-06-24 | 保定天威保变电气股份有限公司 | Copper magnetic shielding measuring device under harmonic and direct current combined excitation |
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