CN107271785A - A kind of common code impedance On-line testing method of common mode choke - Google Patents
A kind of common code impedance On-line testing method of common mode choke Download PDFInfo
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- CN107271785A CN107271785A CN201710453297.0A CN201710453297A CN107271785A CN 107271785 A CN107271785 A CN 107271785A CN 201710453297 A CN201710453297 A CN 201710453297A CN 107271785 A CN107271785 A CN 107271785A
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- common
- common mode
- voltage
- mode choke
- current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
Abstract
The invention discloses a kind of common code impedance On-line testing method of common mode choke, it measures the common-mode voltage and common mode current of common mode choke by oscillograph spectrum channel, the method being divided by using common-mode voltage and common mode current spectrum, obtains the spectral characteristic of common mode choke common code impedance.Compared to traditional by electromagnetism numerical method and by the method for network impedance analyzer extraction impedance parameter, the inventive method need not set up simulation model by software, and process is easier and is easily achieved；Characteristic during common mode choke real work can not be embodied during relatively conventional method extraction impedance, and the common code impedance extracting method of the present invention is measured in system operation, the characteristic that common mode choke shows in actual applications can more accurately be reflected, to suppress electromagnetic interference in systems there is more preferable directive significance.
Description
Technical field
The invention belongs to power electronics technical field of electromagnetic compatibility measurement, and in particular to a kind of common mode resistance of common mode choke
Anti- On-line testing method.
Background technology
Frequency converter has excellent speed adjusting performance and significant energy-saving effect, be widely used in metallurgy, machinery, oil,
The fields such as communications and transportation, and generate significant economic benefit.However, being opened at a high speed because the switching device inside frequency converter is in
Off status, frequency converter has serious electromagnetic interference (EMI), affects the safe and stable operation of Variable Frequency Drives,
Nearby device, supply network can also be threatened simultaneously.
Pulse width modulating technology can cause output side transducer voltage asymmetrical three-phase, so as to produce common-mode voltage, altogether
Mode voltage is by the common mode loop of frequency changing driving system, the propagation in system in the form of common mode current by common mode disturbances.Common mode
Electric current can flow through bearing, and be converted into shaft current, cause bearing galvano-cautery, endanger bearing life.Further, since common mode current is passed
The earth-return circuit line that approach includes the system acted on single-polarized antennas is broadcast, common mode disturbances can be influenceed in the form of near-field thermal radiation
The normal work of nearby device equipment, and common mode disturbances can flow into power network by the earth-return circuit of system, influence the steady of power network
It is fixed.
With the fast development of frequency converter, common mode disturbances problem becomes increasingly conspicuous, and how to eliminate with suppression common mode interference
Become the study hotspot of current academia and industrial quarters, it is a kind of effective side to add common mode choke in frequency converter input side
Method.The impedance operator of common mode choke has important influence to filter effect, to analyze its core saturation effects, high-frequency parasitic
Effect etc. contributes to adjustment element, it is necessary to the impedance to common mode choke is extracted by the impedance for extracting common mode choke
Parameter simultaneously improves filter effect.
At present, extracting the impedance operator of common mode choke mainly has two class methods, i.e. electromagnetism numerical method and network resistance
Anti- method of testing.Main electromagnetism numerical method is FInite Element, Time-limited integral, finite difference calculus, moment method etc., but is utilized
Numerical method need to set up simulation model when extracting impedance parameter by software, it must be understood that accurate physical arrangement, calculate multiple
It is miscellaneous and simulation time is longer, do not possess versatility.Network impedance method of testing is impedance extraction method relatively conventional at present, and it is needed
Largely calculated and approximate processing, and electric impedance analyzer is expensive.In addition, two class methods are all off-line types above,
Characteristic during common mode choke real work can not be embodied.
The content of the invention
In view of it is above-mentioned, the invention provides a kind of common code impedance On-line testing method of common mode choke, it can be transported in system
Measured during row, can more accurately reflect the characteristic that common mode choke shows in actual applications, system where to suppressing
In electromagnetic interference there is more preferable directive significance.
A kind of common code impedance On-line testing method of common mode choke, comprises the following steps：
(1) three phase capacitance is installed with Y types connected mode in common mode choke both sides；
(2) voltage between the three phase capacitance neutral point of common mode choke both sides is measured using voltage probe, the voltage is
The common-mode voltage of common mode choke, and then record using oscillograph spectrum channel the frequency spectrum U of the common-mode voltageCM；
(3) the three-phase current vector of common mode choke is flowed through using current probe measurement, the current phasor and be altogether
The common mode current of mould choke coil, and then record using oscillograph spectrum channel the frequency spectrum I of the common mode currentCM；
(4) by making common-mode voltage spectrum division corresponding with common mode current, you can obtain common mode choke common code impedance
Frequency spectrum.
Further, the three phase capacitance installed in the step (1), both sides total of six electric capacity and capacitance is equal, specifically
Capacitance meets relationship below：
Wherein：fsFor the frequency of line voltage, U is power network phase voltage, iinTo flow through the three-phase electricity stream peak of common mode choke
Value, C is capacitor's capacity.
Further, the spectral range that common-mode voltage and common mode current are set in the step (4) is 1kHz~30MHz,
And then according to formula ZCM=3UCM/ICMCalculate the single-phase frequency spectrum Z for obtaining common mode choke common code impedanceCM。
Compared to traditional by electromagnetism numerical method and by the method for network impedance analyzer extraction impedance parameter,
The inventive method need not set up simulation model by software, and process is easier and is easily achieved.Relatively conventional method is extracted
Characteristic during common mode choke real work can not be embodied during impedance, common code impedance On-line testing method of the present invention can be
Measured during system operation, can more accurately reflect the characteristic that common mode choke shows in actual applications, where suppressing
Electromagnetic interference in system has more preferable directive significance；The inventive method is simple and easy to do simultaneously, and the frequency range of measurement is wide, essence
Degree is high.
Brief description of the drawings
Fig. 1 is the measurement structural representation of common mode choke common-mode voltage of the present invention and common mode current.
Fig. 2 obtains the common-mode voltage spectrum diagram of common mode choke for measurement.
Fig. 3 obtains the common mode current spectrum diagram of common mode choke for measurement.
Fig. 4 is the common code impedance spectrum diagram of common mode choke.
Embodiment
In order to more specifically describe the present invention, below in conjunction with the accompanying drawings and embodiment is to technical scheme
It is described in detail.
The common code impedance On-line testing method of common mode choke of the present invention, comprises the following steps：
(1) as shown in figure 1, installing three phase capacitance respectively with Y types connected mode in common mode choke front-end and back-end, wherein
Property point be E points and F points, utilize voltage probe measurement F points and F points between voltage UEFThe as common-mode voltage of common mode choke,
Voltage spectrum U is recorded using oscillograph spectrum channelCM, it is that 1kHz~30MHz is the impedance for expecting to obtain to set spectral range
The frequency range of frequency spectrum.
Two groups of three phase capacitance capacitances are equal in present embodiment.It is generally acknowledged that the three-phase inlet wire electricity of frequency converter rectification unit
When stream is much larger than the electric current for the three phase capacitance for flowing through addition, the insertion of electric capacity does not produce influence on system, and it is 500 to take its multiple
Times, then the capacitance of six electric capacity meets relationship below：
Wherein, fsFor the frequency and f of line voltages=50Hz, U are power network phase voltage and U=380V, iinIt is whole for frequency converter
Flow the peak value and i of unit three-phase inlet wire currentin=8A, C are the capacitance of three phase capacitance, and calculating obtains C<134nF.Take C=100pF
When, the common-mode voltage spectrum measurement result of common mode choke is as shown in Figure 2.
(2) as shown in figure 1, measured using current probe by the current phasor of three winding common mode choke and, using showing
Ripple device spectrum channel records current spectrum ICM, setting spectral range is 1kHz~30MHz；The common mode current frequency of common mode choke
Compose test result as shown in Figure 3.
(3) it is divided by by common-mode voltage and common mode current spectrum and obtains common code impedance ZCM, because the common mode current measured is
Three-phase line current sum, therefore be converted into single-phase needs divided by 3, then it can obtain formula：
The frequency spectrum that common mode choke common code impedance is finally given in 1kHz~30MHz is as shown in Figure 4.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using the present invention.
Person skilled in the art obviously can easily make various modifications to above-described embodiment, and described herein general
Principle is applied in other embodiment without passing through performing creative labour.Therefore, the invention is not restricted to above-described embodiment, ability
Field technique personnel are according to the announcement of the present invention, and the improvement made for the present invention and modification all should be in protection scope of the present invention
Within.
Claims (3)
1. a kind of common code impedance On-line testing method of common mode choke, comprises the following steps：
(1) three phase capacitance is installed with Y types connected mode in common mode choke both sides；
(2) voltage between the three phase capacitance neutral point of common mode choke both sides is measured using voltage probe, the voltage is common mode
The common-mode voltage of choke coil, and then record using oscillograph spectrum channel the frequency spectrum U of the common-mode voltageCM；
(3) the three-phase current vector of common mode choke is flowed through using current probe measurement, the current phasor and as common mode is gripped
The common mode current of circle is flowed, and then records using oscillograph spectrum channel the frequency spectrum I of the common mode currentCM；
(4) by making common-mode voltage spectrum division corresponding with common mode current, you can obtain the frequency spectrum of common mode choke common code impedance.
2. common code impedance On-line testing method according to claim 1, it is characterised in that：Installed in the step (1)
Three phase capacitance, both sides total of six electric capacity and capacitance is equal, specific capacitance meets relationship below：
<mrow>
<mi>C</mi>
<mo><</mo>
<mfrac>
<msub>
<mi>i</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
<mrow>
<mn>1000</mn>
<msub>
<mi>&pi;Uf</mi>
<mi>s</mi>
</msub>
</mrow>
</mfrac>
</mrow>
Wherein：fsFor the frequency of line voltage, U is power network phase voltage, iinTo flow through the three-phase current peak value of common mode choke, C
For capacitor's capacity.
3. common code impedance On-line testing method according to claim 1, it is characterised in that：Set altogether in the step (4)
The spectral range of mode voltage and common mode current is 1kHz~30MHz, and then according to formula ZCM=3UCM/ICMCalculating obtains common mode and gripped
The single-phase frequency spectrum Z of stream circle common code impedanceCM。
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| CN201710453297.0A CN107271785A (en) | 2017-06-15 | 2017-06-15 | A kind of common code impedance On-line testing method of common mode choke |
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| CN201710453297.0A CN107271785A (en) | 2017-06-15 | 2017-06-15 | A kind of common code impedance On-line testing method of common mode choke |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112926225A (en) * | 2021-04-12 | 2021-06-08 | 北京交通大学 | Modeling and parameter measuring method for high-frequency shaft current of alternating current motor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1996030A (en) * | 2006-12-22 | 2007-07-11 | 南京师范大学 | Device for detecting internal impedance of conductive electromagnetic interference noise source |
| CN104714079A (en) * | 2015-04-01 | 2015-06-17 | 浙江大学 | Common-mode voltage measuring method for frequency converter |
| CN105606899A (en) * | 2015-09-08 | 2016-05-25 | 浙江大学 | Frequency conversion transmission system motor side common code impedance extraction method |
| CN205450154U (en) * | 2016-03-30 | 2016-08-10 | 东莞市广安电气检测中心有限公司 | A device for test of common mode conducted disturbance noise immunity |
-
2017
- 2017-06-15 CN CN201710453297.0A patent/CN107271785A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1996030A (en) * | 2006-12-22 | 2007-07-11 | 南京师范大学 | Device for detecting internal impedance of conductive electromagnetic interference noise source |
| CN104714079A (en) * | 2015-04-01 | 2015-06-17 | 浙江大学 | Common-mode voltage measuring method for frequency converter |
| CN105606899A (en) * | 2015-09-08 | 2016-05-25 | 浙江大学 | Frequency conversion transmission system motor side common code impedance extraction method |
| CN205450154U (en) * | 2016-03-30 | 2016-08-10 | 东莞市广安电气检测中心有限公司 | A device for test of common mode conducted disturbance noise immunity |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112926225A (en) * | 2021-04-12 | 2021-06-08 | 北京交通大学 | Modeling and parameter measuring method for high-frequency shaft current of alternating current motor |
| CN112926225B (en) * | 2021-04-12 | 2023-09-22 | 北京交通大学 | Modeling and parameter measuring method for high-frequency shaft current of alternating-current motor |
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Application publication date: 20171020 |