CN109298370A - The detection method and device of the characteristic of mutual inductor - Google Patents
The detection method and device of the characteristic of mutual inductor Download PDFInfo
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- CN109298370A CN109298370A CN201811405173.6A CN201811405173A CN109298370A CN 109298370 A CN109298370 A CN 109298370A CN 201811405173 A CN201811405173 A CN 201811405173A CN 109298370 A CN109298370 A CN 109298370A
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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
Abstract
The present invention provides the detection method and device of a kind of characteristic of mutual inductor, and the detection method of mutual inductor characteristic includes the critical saturation current for obtaining mutual inductor；According to the critical saturation current of the mutual inductor, the test coil to match with the critical saturation current of the mutual inductor is chosen；The current signal of the mutual inductor is acquired by the test coil；According to the current signal, the characteristic of the mutual inductor is calculated, wherein, by obtaining the critical saturation current of mutual inductor, matched test coil is chosen, when avoiding the current signal of test coil acquisition mutual inductor, since test coil chooses improper the case where leading to increase test error, to promote the accuracy of measurement, and the current signal of mutual inductor is acquired by test coil, and according to the current signal of mutual inductor, the characteristic for the mutual inductor being accurately calculated.
Description
Technical field
The present invention relates to mutual inductor detection technique field more particularly to a kind of detection methods and dress of the characteristic of mutual inductor
It sets.
Background technique
Mutual inductor includes voltage transformer and current transformer, high voltage can be become to low-voltage, high current becomes small electricity
Stream, for measuring or protecting system, function is mainly by high voltage or high current scaling transformation at normal low voltage or mark
Quasi- low current, to realize standardization, the miniaturization of measuring instrumentss, protection equipment and automatic control equipment.Therefore, mutual inductor is
The critical elements of progress of disease current signal in electric system, reliably working is to the safe and stable most important of electric system.Tradition
The characteristic test of upper mutual inductor generallys use indirect analysis method and determines, i.e., powers up mode from secondary side to carry out mutual inductor spy
Property test, such as current transformer is realized simple although powering up test current transformer characteristic from secondary side, can not analyze
Stable state of the current transformer under higher electric current and transient state Transfer characteristic.
Summary of the invention
Based on this, it is necessary to stable state of the mutual inductor under higher electric current can not be analyzed for traditional mutual inductor detection method
With transient state Transfer characteristic, it is necessary to provide a kind of detection method and device of the characteristic of mutual inductor.
A kind of detection method of the characteristic of mutual inductor, comprising:
Obtain the critical saturation current of mutual inductor.
According to the critical saturation current of the mutual inductor, the survey to match with the critical saturation current of the mutual inductor is chosen
Try coil.
The current signal of the mutual inductor is acquired by the test coil.
According to the current signal, the characteristic of the mutual inductor is calculated.
The described the step of current signal of the mutual inductor is acquired by the test coil in one of the embodiments,
Later, further includes:
Using full-wave fourier algorithm, the interference signal for obtaining and carrying in the current signal is calculated, by the interference signal
It filters out.
The step of critical saturation current for obtaining mutual inductor in one of the embodiments, comprising:
Low current test is carried out to the secondary side of the mutual inductor, obtains the test parameter of the mutual inductor.
According to the test parameter of the mutual inductor, the critical saturation current of the mutual inductor is calculated.
The test parameter includes: that internal resistance, knee voltage and the volt-ampere of the mutual inductor are special in one of the embodiments,
Linearity curve.
The critical saturation current according to the mutual inductor in one of the embodiments, is chosen and the mutual inductor
Critical saturation current match test coil the step of, comprising:
According to the critical saturation current of the mutual inductor, sieve to match with the critical saturation current of the mutual inductor is chosen
Family name's coil.
The critical saturation current according to the mutual inductor in one of the embodiments, is chosen and the mutual inductor
Critical saturation current match test coil the step of, comprising:
The self induction electromotive force and the internal impedance of the Rogowski coil and the electromotive force of external impedance for comparing the Rogowski coil, when
When the self induction electromotive force is greater than the electromotive force of the internal impedance and external impedance, according to the critical saturation current of the mutual inductor,
Choose with the critical saturation current of the mutual inductor match from integration type Rogowski coil, when the self induction electromotive force is less than institute
When stating the electromotive force of internal impedance and external impedance, according to the critical saturation current of the mutual inductor, chooses and face with the mutual inductor
The outer integration type Rogowski coil that boundary's saturation current matches.
The quantity of the test coil is two in one of the embodiments, described to be acquired by the test coil
The step of current signal of the mutual inductor includes:
Two test coils are respectively connected to the secondary side of the primary side and the mutual inductor of the mutual inductor.
Acquire the current signal and the mutual inductor of the primary side of the mutual inductor respectively by two test coils
Secondary side current signal.
It is described according to the current signal, the step of characteristic of the mutual inductor is calculated, comprising:
According to the current signal of the current signal of the primary side of the mutual inductor and the secondary side of the mutual inductor, calculate
To the characteristic of the mutual inductor.
It is described according to the current signal in one of the embodiments, the step of the characteristic of the mutual inductor is calculated
Suddenly, comprising:
According to the current signal, the angular difference of the mutual inductor is calculated.
It is described according to the current signal in one of the embodiments, the step of the characteristic of the mutual inductor is calculated
Suddenly, comprising:
According to the current signal, the ratio that the mutual inductor is calculated is poor.
A kind of detection device of the characteristic of mutual inductor, including mutual inductor, test coil and processing module, the test coil
For acquiring the current signal of the mutual inductor, the processing module is used to obtain the critical saturation current of the mutual inductor, institute
Processing module is stated to be also used to that the characteristic of the mutual inductor is calculated according to the current signal of the test coil acquisition.
The detection method of the characteristic of above-mentioned mutual inductor is chosen matched by obtaining the critical saturation current of mutual inductor
Coil is tested, avoids choosing the improper situation for causing test error larger due to test coil, so that the accuracy of measurement is promoted,
And the current signal of mutual inductor is acquired by test coil, and according to the current signal of mutual inductor, the mutual inductance being accurately calculated
The characteristic of device.
Detailed description of the invention
Fig. 1 is the flow diagram of the detection method of the characteristic of mutual inductor in one embodiment；
Fig. 2 is the flow diagram that the critical saturation current of mutual inductor is obtained in one embodiment.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give better embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more the disclosure
Add thorough and comprehensive.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term used herein is intended merely to the mesh of description specific embodiment
, it is not intended that in the limitation present invention.
For example, a kind of detection method of the characteristic of mutual inductor, comprising: obtain the critical saturation current of mutual inductor；According to institute
The critical saturation current of mutual inductor is stated, the test coil to match with the critical saturation current of the mutual inductor is chosen；Pass through institute
State the current signal that test coil acquires the mutual inductor；According to the current signal, the characteristic of the mutual inductor is calculated.
The detection method of the characteristic of above-mentioned mutual inductor is chosen matched by obtaining the critical saturation current of mutual inductor
Coil is tested, avoids choosing the improper situation for causing test error larger due to test coil, so that the accuracy of measurement is promoted,
And the current signal of mutual inductor is acquired by test coil, and according to the current signal of mutual inductor, the mutual inductance being accurately calculated
The characteristic of device.
In one of the embodiments, referring to Fig. 1, a kind of detection method of the characteristic of mutual inductor, comprising:
Step 110, the critical saturation current of mutual inductor is obtained.
Specifically, obtaining the critical saturation current of the primary side of mutual inductor, i.e. acquisition mutual inductor is under different output loadings
Critical saturation current, specifically, when in stable state, short circuit current reaches rated accuracy limit electric current, then at the iron core of mutual inductor
In critical saturation state, the electric current of mutual inductor is known as the critical saturation current of mutual inductor at this time.The critical saturation of different mutual inductors
Electric current is different, it is worth mentioning at this point that, the critical saturation current is related to the no-load voltage ratio of mutual inductor.In one embodiment, described mutual
Sensor is current transformer.
Step 120, according to the critical saturation current of the mutual inductor, the critical saturation current phase with the mutual inductor is chosen
Matched test coil.
In one embodiment, according to the critical saturation current of the mutual inductor, choose maximum input current and it is described mutually
The test coil that the critical saturation current of sensor matches, that is, the maximum input current and the mutual inductor of the test coil chosen
Critical saturation current match.In the present embodiment, according to the critical saturation current of the mutual inductor, maximum input current is chosen
The test coil equal with the critical saturation current of the mutual inductor, that is, choose test coil maximum input current with it is described
The critical saturation current of mutual inductor is equal, in another embodiment, sets preset threshold, according to the critical full of the mutual inductor
And electric current, the maximum input current of the test coil of selection and the difference of the critical saturation current are in the preset threshold.
Specifically, according to the critical saturation current of the mutual inductor, it is defeated when detecting to obtain the mutual inductor in this step
Enter the range of electric current, specifically, according to the critical saturation current, available mutual inductor is in steady state test and transient test
Through-flow size determines that maximum input current and the mutual inductor exist according to the size of mutual inductor input current when detecting
The test coil that the size of input current matches when detection, that is to say, that the maximum input current of the test coil and mutual inductance
The critical saturation current of device matches, in this way, choosing the test coil to match with critical saturation current, can accurately measure mutually
The current signal of sensor, to avoid choosing the improper situation for causing measurement error big because of test coil.
Step 130, the current signal of the mutual inductor is acquired by the test coil.
Specifically, the input voltage signal of mutual inductor can be converted to current signal by test coil, that is, test coil energy
It is enough that the voltage signal of mutual inductor is really reduced into corresponding current signal, it therefore, will be mutual by the way that the test coil is arranged
The voltage signal of sensor is converted into current signal, it should be understood that the test coil can carry out the voltage signal of output
The voltage signal of output is really restored input current signal by the circuit of integral, to can acquire institute by the test coil
State the current signal of mutual inductor.
Step 140, according to the current signal, the characteristic of the mutual inductor is calculated.
Specifically, the characteristic of the mutual inductor include: mutual inductor ratio is poor, the excitation of angular difference of mutual inductor and mutual inductor is special
Property, it is to measure the main indicator of the performance of mutual inductor of protection, and the characteristic of the mutual inductor is believed with the electric current of mutual inductor
It is number related, that is, pass through the current signal of the mutual inductor, the characteristic of the mutual inductor can be calculated.
The detection method of the characteristic of above-mentioned mutual inductor is chosen matched by obtaining the critical saturation current of mutual inductor
Coil is tested, avoids choosing the improper situation for causing test error larger due to test coil, so that the accuracy of measurement is promoted,
And the current signal of mutual inductor is acquired by test coil, and according to the current signal of mutual inductor, the mutual inductance being accurately calculated
The characteristic of device.
It is described in one of the embodiments, to pass through institute in order to further enhance the accuracy of the Characteristics Detection of mutual inductor
It states and tests after the step of coil acquires the current signal of the mutual inductor, further includes:
Using full-wave fourier algorithm, the interference signal for obtaining and carrying in the current signal is calculated, by the interference signal
It filters out.
Specifically, some clutters are adulterated in the current signal of the mutual inductor acquired by test coil, specifically, passing through survey
Trying the current signal of the mutual inductor of coil acquisition, there are also various integer harmonics, non-whole secondary humorous in addition to containing 50 hertz of fundamental wave other than
Wave.I.e. a cycle function can be decomposed into DC component an, fundametal compoment bnAnd the infinite series of each harmonic, at one
In embodiment, by the current signal of acquisition by full-wave fourier algorithm, by the DC component and each harmonic electricity in current signal
Flow component filters out, specifically, assuming the expression formula of the current signal i (t) of the mutual inductor of test coil acquisition are as follows:
Wherein, ω1Indicate fundamental wave frequency；anFor the sinusoidal amplitude of each harmonic, bnFor the width of the cosine of each harmonic
Value, wherein as n=0, i.e. b0Indicate DC component, a1Indicate the amplitude of the sine term of fundametal compoment, b1Indicate fundametal compoment
Cosine term amplitude.
Then according to the principle of fourier series, DC component a is calculatednWith fundametal compoment bnExpression formula be respectively as follows:
Then nth harmonic current component in(t) expression formula are as follows:
in(t)=bn cos(nw1t)+an sin(nw1t) (4)
It then can be in the hope of the virtual value i of nth harmonic current componentnWith the phase angle of nth harmonic current componentExpression formula
Are as follows:
The amplitude of each harmonic component and the phase angle of each harmonic component can be found out by full-wave fourier algorithm, i.e., by complete
All fourier algorithms can effectively filter out Constant Direct Current component and each harmonic component, to promote the standard of the Characteristics Detection of mutual inductor
True property.
In order to further enhance the accuracy of the detection of the characteristic of mutual inductor, in one embodiment, the mutual inductor
Characteristic detection method, further include, by the current signal by WAVELET PACKET DECOMPOSITION and full wave Fourier algorithm, by the electric current
The interference signal of signal filters out, specifically, Fault Signal Analyses in HV Transmission expression formula are as follows:
Wherein: σ is system time constant；An、The respectively amplitude and phase of n-th harmonic；Short-circuit initial time (t
=0) voltage phase angle, ω0For fundamental frequency (power frequency 50Hz).
DC component is extracted using WAVELET PACKET DECOMPOSITION method, wavelet transformation is to carry out original signal and a wavelet basis function
Convolution, there is wavelet basis function time domain and frequency domain to have localization, translatable flexible property, by convolution by signal decomposition at not
Ingredient on same frequency band-period.Wavelet transformation is defined as follows:
In formula: b is time shift, and a is scale factor,As wavelet.
Using the sinusoidal component U of full-wave fourier algorithm measurement fundamental waveR1With the cosine component U of fundamental waveI1Expression formula are as follows:
Wherein: N is fundamental frequency cycles number of samples；U (t) is the voltage magnitude of sampling instant.Current signal is passed through into small echo
Packet decomposes and full-wave fourier algorithm, so as to obtain the sinusoidal component U of fundamental waveR1With the cosine component U of fundamental waveI1, thus directly
Current signal after obtaining filtering interference signals further promotes the accuracy of the Characteristics Detection of mutual inductor.
In order to preferably realize mutual inductor critical saturation current acquisition, please refer to figure in one of the embodiments,
2, it is described obtain mutual inductor critical saturation current the step of, comprising:
Step 111, low current test is carried out to the secondary side of the mutual inductor, obtains the test parameter of the mutual inductor.
Step 112, according to the test parameter of the mutual inductor, it is critical under different output loadings to calculate the mutual inductor
Saturation current.
The test parameter includes: that internal resistance, knee voltage and the volt-ampere of the mutual inductor are special in one of the embodiments,
Linearity curve.
Specifically, low current test is the test of low current C-V characteristic, low current test is boosted using low current frequency conversion
Method, by obtain mutual inductor monodrome magnetization curve, the mathematical model of mutual inductor is established, to simulate mutual inductor in stable state
A kind of test method of Transfer characteristic under high current, specifically, the secondary side of the mutual inductor, the i.e. output end of mutual inductor,
Low current test is carried out by secondary side to mutual inductor, to obtain the internal resistance of mutual inductor, the knee voltage of mutual inductor and mutually
The VA characteristic curve of sensor passes through the VA characteristic curve of the internal resistance of mutual inductor, the knee voltage of mutual inductor and mutual inductor, meter
Calculation obtains critical saturation current of the mutual inductor under different output loadings, wherein mutual inductor is critical under different output loadings
The expression formula of saturation current are as follows:
Wherein, Z2For secondary output load impedance；For the power factor of output loading；R1It is electric in secondary circuit
Resistance；X1For secondary circuit internal impedance；E2For knee voltage；N is current transformer ratio.
In this way, corresponding test parameter is obtained, consequently facilitating obtaining mutual inductor by carrying out low current test to mutual inductor
Critical saturation current under different output loadings, and according to the critical saturation current of mutual inductor under different loads is obtained, it can
To determine input current range of the mutual inductor in test, testing cost can be caused higher to avoid because input current is excessive in this way
The case where, or cause mutual inductor not can enter saturation state because input current is smaller, influence the accuracy of test.
It is described according to institute in one of the embodiments, for the ease of promoting the precision for the current signal for acquiring mutual inductor
The step of stating the critical saturation current of mutual inductor, choosing the test coil to match with the critical saturation current of the mutual inductor,
Include:
According to the critical saturation current of the mutual inductor, sieve to match with the critical saturation current of the mutual inductor is chosen
Family name's coil.
Specifically, the critical saturation current according to the mutual inductor under different output loadings, chooses and the mutual inductor
The Rogowski coil that critical saturation current under different output loadings matches, i.e., according to the critical of the primary side of the mutual inductor
Saturation current chooses the Rogowski coil to match with the critical saturation current of the primary side of the mutual inductor.Pass through the Roche
Coil acquires the current signal of the mutual inductor, is free of ferrimagnet since Rogowski coil has, no hysteresis effect, almost
Zero phase error；Performance without magnetic saturation elephant, thus measurement range can satisfy from several amperes to the electric current of hundreds of kilo-amperes
The primary side high current of mutual inductor acquires, and Rogowski coil has measurement range wide, and precision is high, and reliable and stable, response band is wide
Characteristic, and Rogowski coil can integrate the voltage signal of the output of mutual inductor, so as to really restore input
Electric current acquires the current signal of mutual inductor by Rogowski coil, the precision for obtaining current signal can be promoted, to promote mutual inductance
The accuracy of the Characteristics Detection of device.
In order to further make to improve Rogowski coil acquisition mutual inductor current signal accuracy, one embodiment wherein
In, the critical saturation current according to the mutual inductor chooses the survey to match with the critical saturation current of the mutual inductor
The step of trying coil, comprising:
The self induction electromotive force and the internal impedance of the Rogowski coil and the electromotive force of external impedance for comparing the Rogowski coil, when
When the self induction electromotive force is greater than the electromotive force of the internal impedance and external impedance, according to the critical saturation current of the mutual inductor,
Choose with the critical saturation current of the mutual inductor match from integration type Rogowski coil, when the self induction electromotive force is less than institute
When stating the electromotive force of internal impedance and external impedance, according to the critical saturation current of the mutual inductor, chooses and face with the mutual inductor
The outer integration type Rogowski coil that boundary's saturation current matches.
In one of the embodiments, the critical saturation current according to the mutual inductor is chosen and the mutual inductor
Critical saturation current match test coil the step of, comprising:
The self induction electromotive force and the internal impedance of the Rogowski coil and the electromotive force of external impedance for comparing the Rogowski coil, when
When the self induction electromotive force is much larger than the electromotive force of the internal impedance and external impedance, according to the critical saturation of mutual inductor electricity
Stream, choose with the critical saturation current of the mutual inductor match from integration type Rogowski coil, when the self induction electromotive force is remote
When less than the electromotive force of the internal impedance and external impedance, according to the critical saturation current of the mutual inductor, choose and the mutual inductance
The outer integration type Rogowski coil that the critical saturation current of device matches.
Specifically, the equivalent-circuit model of Rogowski coil it is to be understood that Rogowski coil induced electromotive force e (t) and line
The induced current i flowed through in circle2(t) relationship are as follows:
Wherein: e (t) is the induced electromotive force of Rogowski coil, i2It (t) is the induced current flowed through in Rogowski coil, i1(t)
To be tested electric current, i.e., by the current signal of the mutual inductor of Rogowski coil acquisition, M is mutual between Rogowski coil and current-carrying conductor
Feel coefficient, LCFor the electrodynamic capacity of Rogowski coil, RCFor Rogowski coil and internal resistance；RSFor terminal resistance,For Roche
The self induction electromotive force of coil, (RC+RS)i2It (t) is the electromotive force of the internal impedance of Rogowski coil and external impedance.
Formula (10) are substituted into (11), are obtained:
When electromotive force of the self induction electromotive force much larger than the internal impedance and external impedance, using from integration type Roche line
Circle, that is, work as LC(di2(t)/dt) > > (RS+RC)i2(t) when, using from integration type Rogowski coil.
Since self induction electromotive force is much larger than the electromotive force of internal impedance and external impedance, i.e. LC(di2(t)/dt) > > (RS+RC)i2
(t), specifically, then, (RC+RS)i2(t) it can be ignored, i.e.,
Then it is tested electric current i1(t) expression formula is
i1(t)≈-LCi2(t)/M (14)
Wherein, the electrodynamic capacity expression formula of Rogowski coil is LC
LC=nM (15)
Wherein, n is the small number of wire turns of Rogowski coil.
Formula (15) are substituted into formula (14), so that tested electric current i be calculated1(t) expression formula are as follows:
i1(t)≈-ni2(t) (16)
Then when self induction electromotive force is much larger than the electromotive force of internal impedance and external impedance, the input voltage essence of Rogowski coil itself
Degree can not connect integral amplifier in the case where meeting, then using from integration type Rogowski coil, can accurately acquire the mutual inductance
The current signal of device.
When the self induction electromotive force is much smaller than the electromotive force of the internal impedance and external impedance, then outer integration type Roche is used
Coil.Work as LC(di2(t)/dt) < < (RS+RC)i2(t) when, using outer integration type Rogowski coil.
When due to self induction electromotive force much smaller than the electromotive force of internal impedance and external impedance, i.e. LC(di2(t)/dt) < < (RS+
RC)i2(t), then, LC(di2(t)/dt) it can be ignored, i.e.,
Then, it is tested electric current i1(t) expression formula are as follows:
Wherein, USIt (t) is terminal resistance RSEnd voltage.
Then, when self induction electromotive force is much smaller than the electromotive force of internal impedance and external impedance, electric current, the i.e. electric current of mutual inductor are tested
Signal is needed through integrating circuit, the voltage of terminal could be reduced into tested electric current, therefore, when self induction electromotive force is much smaller than
When the electromotive force of internal impedance and external impedance, believed using the electric current that outer integration type Rogowski coil can accurately acquire the mutual inductor
Number.
It is worth mentioning, preset threshold is set, self induction electromotive force is much larger than the electromotive force of internal impedance and external impedance, that is, from
The size of induction electromotive force is more than the preset threshold multiple of the electromotive force of internal impedance and external impedance, and self induction electromotive force is much smaller than internal impedance
With the electromotive force of external impedance, i.e. preset threshold multiple of the size of the electromotive force of internal impedance and external impedance more than self induction electromotive force.
The preset threshold is 20 in one of the embodiments, and in another embodiment, the preset threshold is 100, is worth one
It mentioning, the preset threshold is bigger, then the current signal of Rogowski coil measurement is more accurate, and the current signal of measurement is more accurate,
When Rogowski coil acquires the current signal of mutual inductor, the difference comparsion of the electromotive force of self induction electromotive force and internal impedance and external impedance
Greatly, i.e., one of electromotive force can be ignored, and influence on the accuracy of detection little.
Therefore, by judging the self induction electromotive force of the Rogowski coil and the internal impedance and external impedance of the Rogowski coil
The size of electromotive force chooses matched Rogowski coil, can further promote the current signal of Rogowski coil acquisition mutual inductor
Accuracy, the case where avoiding Rogowski coil selection improper and increase test error.
For the ease of the current signal of the secondary side of the current signal and mutual inductor of the primary side of acquisition mutual inductor, wherein
In one embodiment, the quantity of the test coil is two, the electricity that the mutual inductor is acquired by the test coil
Flow signal the step of include: by two it is described test coils be respectively connected to the mutual inductor primary side and the mutual inductor two
Secondary side；By two it is described test coils acquire respectively the mutual inductor primary side current signal and the mutual inductor two
The current signal of secondary side.
It is described according to the current signal in the present embodiment, the step of characteristic of the mutual inductor is calculated, comprising:
According to the current signal of the current signal of the primary side of the mutual inductor and the secondary side of the mutual inductor, it is calculated described mutual
The characteristic of sensor.
In the present embodiment, a test coil is accessed to the primary side of the mutual inductor, by another test
Coil accesses the secondary side of the mutual inductor；The electric current letter of the primary side of the mutual inductor is acquired by a test coil
Number, the current signal of the secondary side of the mutual inductor is acquired by test coil described in another, in this way, passing through two surveys of setting
Examination coil acquires the current signal of the current signal of the primary side of mutual inductor and the secondary side of mutual inductor respectively, consequently facilitating acquisition
The current signal of the secondary side of the current signal and mutual inductor of the primary side of mutual inductor, and when detection, it is to the primary of mutual inductor
The larger current for directly measuring the primary side of mutual inductor may be implemented, so as to realize mutual inductor higher in side galvanization
The detection of stable state and transient state Transfer characteristic under electric current.By the way that two test coils are arranged, consequently facilitating the one of acquisition mutual inductor
The current signal of the secondary side of the current signal and mutual inductor of secondary side.
In one embodiment, the specifications parameter of described two test coils is identical.Due to the electricity of the secondary side of mutual inductor
Stream or voltage are less than the current or voltage of the primary side of mutual inductor, then the maximum input current for testing coil is greater than mutual inductor
Therefore the electric current of secondary side using the current signal of the test coil acquisition mutual inductor of two same size parameters, is chosen and mutual
The test coil that the critical saturation current of sensor matches will not use the electric current of the secondary side of mutual inductor and generate error, because
This, the specifications parameters of two test coils are identical, will not influence test coil to the secondary of the primary side of mutual inductor and mutual inductor
The current signal of side acquires.
It is described according to the electricity in one of the embodiments, in order to realize that the angular difference characteristic to mutual inductor detects
The step of flowing signal, the characteristic of the mutual inductor be calculated, comprising: according to the current signal, the mutual inductance is calculated
The angular difference of device.
Specifically, the angular difference of the mutual inductor refers to phaseangle of a current transformer, i.e. the secondary side electricity of current transformer
Flow the phase angle difference after phasor turns 180 ° counterclockwise between the primary current of mutual inductor.The then expression formula of the angular difference δ of mutual inductor are as follows:
Wherein, μ is the magnetic conductivity of core material；For dielectric loss angle；lcFor magnetic circuit average length；ScIt is effective for iron core
Sectional area；N1、N2For first and second the number of turns；F is supply frequency；α is secondary impedance angle, I1For the electric current of the primary side of mutual inductor
Signal, I2For the current signal of the secondary side of mutual inductor, specifically, the current signal includes the electric current of the primary side of mutual inductor
The current signal of the secondary side of signal and mutual inductor.In this way, the angle of mutual inductor can be calculated according to the current signal
Difference detects the angular difference characteristic of mutual inductor to realize.
It is described according to the electric current in wherein one implementation in order to realize detecting than difference characteristic to mutual inductor
Signal, the step of characteristic of the mutual inductor is calculated, comprising: according to the current signal, the mutual inductor is calculated
Ratio it is poor.
Specifically, the ratio difference of the mutual inductor refers to current transformer when measuring electric current, due to actual current ratio and volume
Constant current is multiplied by the one of nominal transformation ratio and mutual inductor than different equal caused errors, the i.e. actual current of the secondary side of mutual inductor
The difference of the actual current of secondary side, and the percentage of the actual current to the primary side of mutual inductor.Then, mutual inductor than difference ε's
Expression formula are as follows:
Wherein, KnFor rated current ratio, μ is the magnetic conductivity of core material；For dielectric loss angle；lcIt is averagely long for magnetic circuit
Degree；ScFor iron core effective sectional area；N1、N2For first and second the number of turns；F is supply frequency；α is secondary impedance angle, I1For mutual inductance
The current signal of the primary side of device, I2For the current signal of the secondary side of mutual inductor, specifically, the current signal includes mutual inductance
The current signal of the secondary side of the current signal and mutual inductor of the primary side of device.In this way, can be calculated according to the current signal
The ratio for obtaining mutual inductor is poor, to realize detecting than difference characteristic to mutual inductor.
A kind of detection device of the characteristic of mutual inductor, including mutual inductor, test coil are provided in one of the embodiments,
And processor, the test coil are used to acquire the current signal of the mutual inductor, the processor is for obtaining the mutual inductance
The critical saturation current of device, the processor are also used to be calculated according to the current signal of the test coil acquisition
The characteristic of the mutual inductor.
The detection device of the characteristic of above-mentioned mutual inductor is chosen matched by obtaining the critical saturation current of mutual inductor
Coil is tested, when avoiding the current signal of test coil acquisition mutual inductor, causes to increase since test coil selection is improper and test
The case where error, to promote the accuracy of measurement, and acquires the current signal of mutual inductor by test coil, and according to mutual inductance
The current signal of device, the characteristic for the mutual inductor being accurately calculated.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of detection method of the characteristic of mutual inductor characterized by comprising
Obtain the critical saturation current of mutual inductor；
According to the critical saturation current of the mutual inductor, the p-wire to match with the critical saturation current of the mutual inductor is chosen
Circle；
The current signal of the mutual inductor is acquired by the test coil；
According to the current signal, the characteristic of the mutual inductor is calculated.
2. the detection method of the characteristic of mutual inductor according to claim 1, which is characterized in that described to pass through the p-wire
Circle acquired after the step of current signal of the mutual inductor, further includes:
Using full-wave fourier algorithm, the interference signal for obtaining and carrying in the current signal is calculated, the interference signal is filtered out.
3. the detection method of the characteristic of mutual inductor according to claim 1, which is characterized in that described to obtain facing for mutual inductor
The step of boundary's saturation current, comprising:
Low current test is carried out to the secondary side of the mutual inductor, obtains the test parameter of the mutual inductor；
According to the test parameter of the mutual inductor, the critical saturation current of the mutual inductor is calculated.
4. the detection method of the characteristic of mutual inductor according to claim 3, which is characterized in that the test parameter includes:
Internal resistance, knee voltage and the VA characteristic curve of the mutual inductor.
5. the detection method of the characteristic of mutual inductor according to claim 1, which is characterized in that described according to the mutual inductor
Critical saturation current, the step of choosing the test coil to match with the critical saturation current of the mutual inductor, comprising:
According to the critical saturation current of the mutual inductor, the Roche line to match with the critical saturation current of the mutual inductor is chosen
Circle.
6. the detection method of the characteristic of mutual inductor according to claim 5, which is characterized in that described according to the mutual inductor
Critical saturation current, the step of choosing the test coil to match with the critical saturation current of the mutual inductor, comprising:
The self induction electromotive force and the internal impedance of the Rogowski coil and the electromotive force of external impedance for comparing the Rogowski coil, when described
When self induction electromotive force is greater than the electromotive force of the internal impedance and external impedance, according to the critical saturation current of the mutual inductor, choose
With the critical saturation current of the mutual inductor match from integration type Rogowski coil, when the self induction electromotive force is less than in described
When the electromotive force of impedance and external impedance, according to the critical saturation current of the mutual inductor, choose critical full with the mutual inductor
The outer integration type Rogowski coil to match with electric current.
7. the detection method of the characteristic of mutual inductor according to claim 1, which is characterized in that the quantity of the test coil
It is two, described the step of acquiring the current signal of the mutual inductor by the test coil includes:
Two test coils are respectively connected to the secondary side of the primary side and the mutual inductor of the mutual inductor；
By two it is described test coils acquire respectively the mutual inductor primary side current signal and the mutual inductor two
The current signal of secondary side；
It is described according to the current signal, the step of characteristic of the mutual inductor is calculated, comprising:
According to the current signal of the current signal of the primary side of the mutual inductor and the secondary side of the mutual inductor, institute is calculated
State the characteristic of mutual inductor.
8. the detection method of the characteristic of mutual inductor according to claim 1, which is characterized in that described to be believed according to the electric current
Number, the step of characteristic of the mutual inductor is calculated, comprising:
According to the current signal, the angular difference of the mutual inductor is calculated.
9. the detection method of the characteristic of mutual inductor according to claim 1, which is characterized in that described to be believed according to the electric current
Number, the step of characteristic of the mutual inductor is calculated, comprising:
According to the current signal, the ratio that the mutual inductor is calculated is poor.
10. a kind of detection device of the characteristic of mutual inductor, which is characterized in that including mutual inductor, test coil and processing module, institute
The current signal that test coil is used to acquire the mutual inductor is stated, the processing module is used to obtain the critical full of the mutual inductor
And electric current, the processing module are also used to that the mutual inductance is calculated according to the current signal of the test coil acquisition
The characteristic of device.
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