CN108508271A - A kind of transformer frequency sweep impedance test device - Google Patents
A kind of transformer frequency sweep impedance test device Download PDFInfo
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- CN108508271A CN108508271A CN201810565980.8A CN201810565980A CN108508271A CN 108508271 A CN108508271 A CN 108508271A CN 201810565980 A CN201810565980 A CN 201810565980A CN 108508271 A CN108508271 A CN 108508271A
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- 238000005259 measurement Methods 0.000 claims abstract description 9
- 238000005070 sampling Methods 0.000 abstract description 14
- 238000010998 test method Methods 0.000 abstract description 6
- 230000000875 corresponding Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001808 coupling Effects 0.000 description 2
- 238000002847 impedance measurement Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000001186 cumulative Effects 0.000 description 1
- 230000001066 destructive Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
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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
Abstract
The present invention provides a kind of transformer frequency sweep impedance test devices, it is high to solve requirement of traditional test method to sampling system, it is difficult to the technical issues of ensureing sampling precision.Apparatus of the present invention include：Sweep Source, power amplifier, first measure resistance, the second measurement resistance, hardware divider and true effective value converting circuit；The output end of Sweep Source and the input terminal of power amplifier connect；The output end of power amplifier is connect with the first input end of the input terminal of transformer and hardware divider respectively；First measurement resistance is connected between power amplifier and transformer；The output end of transformer and the second input terminal of hardware divider connect；The output end of transformer also measures resistance eutral grounding by second；The output end of hardware divider and the input terminal of true effective value converting circuit connect.
Description
Technical field
The present invention relates to transformer field of measuring technique more particularly to a kind of transformer frequency sweep impedance test devices.
Background technology
In the power system, transformer is expensive and important one of equipment.Due to the particularity of its internal structure, personnel
The factors such as operation error, lightning current impact and load capacity mutation can all cause running transformer extremely serious damage.
When transformer is by short-circuit impact electric current, winding is since powerful electric power can be distorted, it is permanent with displacement etc. to collapse
Deformation such as finds and reparation, cumulative effect can be such that deformation further develops not in time, and then causes the failure of winding exterior insulation,
And it ultimately causes entire electric system and power outage occurs.Correctly timely transformer winding state is detected, it can be most
Limits ensure the safe operation of transformer, to extend the working life of transformer.
The Repair of Transformer of early stage is mostly manually to hang cover inspection, and this method takes time and effort, and effect is general, misoperation
Humidified insulation can also be caused.In order to solve problem above, there has been proposed the transformer non-destructive testings based on frequency sweep impedance detection
Method-frequency sweep impedance method.
Frequency sweep impedance method is a kind of lossless inspection of novel transformer of combination frequency response analysis and short circuit impedance method advantage
Survey method.This method can accurately differentiate the situation of winding by comparing the deviation of short-circuit impedance value under 10Hz-1MHz frequencies,
According to the change of transformer frequencies-impedance curve (i.e. frequency sweep impedance curve), type and the position of failure can determine, test
System is as shown in Figure 2.
Impedance solution formula is as follows：
Wherein, j ω are plural angle, Zk(j ω) is complex impedance, Ui(j ω) is plural input voltage, Uo(j ω) is multiple
Number output voltage, I1(j ω) is plural output current, and α is sampling resistor coefficient.It can be seen from formula (1) how
Under 10Hz-1MHz frequencies can accurate measuring transformer plural short-circuit impedance, and finally solve the mould of plural short-circuit impedance |
Zk1(j ω) | it is a problem.
Shown in traditional test method Fig. 3, U is acquired with high-speed collection cardi(j ω) and Uo(j ω), due to being needed in calculating
It is accurate to calculate Ui(j ω) and UoThe phase and amplitude of (j ω) is believed to meet the required precision of phase and amplitude 1% in input
Number under the extreme case of 1MHz, to need the sample frequency of 100MHz, while taller precision samples, and exists to sampling system
It is required that high, it is difficult to the technical issues of ensureing sampling precision.
Invention content
The present invention provides a kind of transformer frequency sweep impedance test devices, solve traditional test method to sampling system
Requirement it is high, it is difficult to the technical issues of ensureing sampling precision.
The present invention provides a kind of transformer frequency sweep impedance test devices, including：
Sweep Source, power amplifier, first measure resistance, the second measurement resistance, hardware divider and RMS conversion
Circuit；
The output end of the Sweep Source is connect with the input terminal of the power amplifier；
The output end of the power amplifier is defeated with the first of the input terminal of transformer and the hardware divider respectively
Enter end connection；
The first measurement resistance is connected between the power amplifier and the transformer；
The output end of the transformer is connect with the second input terminal of the hardware divider；
The output end of the transformer also measures resistance eutral grounding by described second；
The output end of the hardware divider is connect with the input terminal of the true effective value converting circuit.
Optionally, a kind of transformer frequency sweep impedance test device provided by the invention further includes：
Data collecting card；
The input terminal of the data acquisition is connect with the output end of the true effective value converting circuit.
Optionally, the Sweep Source generates sinusoidal signal.
Optionally, the voltage magnitude of the sinusoidal signal is amplified at least 20V by the power amplifier, by the sine
The current amplitude of signal is amplified at least 1A.
As can be seen from the above technical solutions, the present invention has the following advantages：
The present invention provides a kind of transformer frequency sweep impedance test devices, including：Sweep Source, power amplifier, first are surveyed
Measure resistance, the second measurement resistance, hardware divider and true effective value converting circuit；The output end of the Sweep Source and the power
The input terminal of amplifier connects；The output end of the power amplifier respectively with the input terminal of transformer and the hardware division
The first input end of device connects；The first measurement resistance is connected between the power amplifier and the transformer；It is described
The output end of transformer is connect with the second input terminal of the hardware divider；The output end of the transformer also passes through described
Two measure resistance eutral grounding；The output end of the hardware divider is connect with the input terminal of the true effective value converting circuit.
The present invention is handled the measuring signal that Sweep Source is sent out by hardware divider and true effective value converting circuit,
The precision of transformer impedance measurement, and the characteristic using hardware divider in the time domain are improved, the phase of complex division is remained
Position characteristic, ensure that the correctness of test result, it is high to solve requirement of traditional test method to sampling system, it is difficult to protect
The technical issues of demonstrate,proving sampling precision.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of structural schematic diagram of transformer frequency sweep impedance test device provided by the invention；
Fig. 2 is the equivalent circuit diagram of transformer frequency sweep testing impedance；
Fig. 3 is the structural schematic diagram of traditional transformer frequency sweep impedance test device；
Wherein, reference numeral is：
1, Sweep Source；2, power amplifier；3, first resistance is measured；4, second resistance is measured；5, transformer；6, hardware removes
Musical instruments used in a Buddhist or Taoist mass；7, true effective value converting circuit；8, data collecting card；9, computer.
Specific implementation mode
An embodiment of the present invention provides a kind of transformer frequency sweep impedance test devices, solve traditional test method to adopting
The requirement of sample system is high, it is difficult to the technical issues of ensureing sampling precision.
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
All other embodiment that those of ordinary skill is obtained without making creative work, belongs to protection of the present invention
Range.
Referring to Fig. 1, the present invention provides a kind of one embodiment of transformer frequency sweep impedance test device, including：
Sweep Source 1, power amplifier 2, first measure resistance 3, second and measure resistance 4, hardware divider 6 and real effective
Conversion circuit 7；
The output end of Sweep Source 1 is connect with the input terminal of power amplifier 2；
The output end of power amplifier 2 connects with the first input end of the input terminal of transformer 5 and hardware divider 6 respectively
It connects；
First measurement resistance 3 is connected between power amplifier 2 and transformer 5；
The output end of transformer 5 is connect with the second input terminal of hardware divider 6；
The output end of transformer 5 also measures resistance 4 by second and is grounded；
The output end of hardware divider 6 is connect with the input terminal of true effective value converting circuit 7；
It should be noted that since hardware divider 6 is analog circuit, division is to complete in the time domain, can be effective
CompletionOperation.The U that hardware divider 6 inputsi(jω)、Uo(j ω) is the sine voltage under 10Hz-1MHz frequencies
Signal obtains result of division Zk1(j ω) is also a sine voltage signal, Zk1Phase and amplitude spy is completely remained in (j ω)
Sign.
True effective value converting circuit 7 can be defeated at DC voltage the RMS-DC converter of different frequency sine voltage signal
Go out, it, can be by the sine voltage signal Z under 10Hz-1MHz frequencies for this test devicek1(j ω) is converted into | Zk1(jω)
| corresponding d. c. voltage signal.
The measuring signal that the embodiment of the present invention sends out Sweep Source 1 by hardware divider 6 and true effective value converting circuit 7
It is handled, improves the precision of 5 impedance measurement of transformer, and the characteristic using hardware divider 6 in the time domain, remained multiple
The phase characteristic of number division, ensure that the correctness of test result, solves requirement of traditional test method to sampling system
It is high, it is difficult to the technical issues of ensureing sampling precision.
Further, a kind of transformer frequency sweep impedance test device provided in an embodiment of the present invention further includes：
Data collecting card 8；
The input terminal of data acquisition is connect with the output end of true effective value converting circuit 7；
It should be noted that relative to the data collecting card 8 in traditional test scheme, capture card only needs height in new departure
What the acquisition true effective value converting circuit 7 of precision exported | Zk1(j ω) | corresponding d. c. voltage signal, the sampling of 100Hz
Rate can be met the requirements, and can be selected rate low at this time but the higher capture card of precision, significantly be reduced capture card
Cost and difficulty, while the precision of sampling is greatly improved；Data collecting card 8 is connect with computer 9, by collected data
It is sent to computer 9 and carries out subsequent calculating and analysis.
Further, Sweep Source 1 generates sinusoidal signal.
Further, the voltage magnitude of sinusoidal signal is amplified at least 20V by power amplifier 2, by the electricity of sinusoidal signal
Stream amplitude is amplified at least 1A.
A kind of working method of transformer frequency sweep impedance test device provided in an embodiment of the present invention is as follows：
S1) Sweep Source 1 exports the small signal of sinusoidal voltage of 10Hz-1MHz according to swept frequency node requirements；
S2) power amplifier 2 puts high low signal sinusoidal voltage waveform, and the maximum voltage value of amplified signal requires to be not less than
20V, output maximum current require to be not less than 1A；
S3 amplified signal) is inputted into transformer 5 to be measured；
S4) resistance 3, second being measured by first and measuring the conversion of resistance 4, input voltage Ui and output voltage Uo are sent to
6 circuit of hardware divider completes the sine voltage signal division arithmetic under time domain, and exports the sinusoidal voltage of corresponding result of division
Signal Zk1；
S5 the output signal of hardware divider 6) is input to true effective value converting circuit 7, by having for sine voltage signal
Valid value is converted into d. c. voltage signal；
S6 d. c. voltage signal) is inputted into capture card, and completes the high precision collecting of voltage signal；
S7) the voltage and current data of acquisition feeding computer 9 is calculated and analyzed；
S8 the related conclusions of 5 operating condition of transformer) are obtained.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed system, device and method can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be the indirect coupling by some interfaces, device or unit
It closes or communicates to connect, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can be stored in a computer read/write memory medium.Based on this understanding, technical scheme of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the present invention
Portion or part steps.And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before
Stating embodiment, invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to preceding
The technical solution recorded in each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
Modification or replacement, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (4)
1. a kind of transformer frequency sweep impedance test device, which is characterized in that including：
Sweep Source, power amplifier, first measure resistance, the second measurement resistance, hardware divider and true effective value converting circuit；
The output end of the Sweep Source is connect with the input terminal of the power amplifier；
The output end of the power amplifier respectively with the input terminal of transformer and the first input end of the hardware divider
Connection；
The first measurement resistance is connected between the power amplifier and the transformer；
The output end of the transformer is connect with the second input terminal of the hardware divider；
The output end of the transformer also measures resistance eutral grounding by described second；
The output end of the hardware divider is connect with the input terminal of the true effective value converting circuit.
2. transformer frequency sweep impedance test device according to claim 1, which is characterized in that further include：
Data collecting card；
The input terminal of the data acquisition is connect with the output end of the true effective value converting circuit.
3. transformer frequency sweep impedance test device according to claim 1, which is characterized in that the Sweep Source generates sinusoidal
Signal.
4. transformer frequency sweep impedance test device according to claim 3, which is characterized in that the power amplifier is by institute
The voltage magnitude for stating sinusoidal signal is amplified at least 20V, and the current amplitude of the sinusoidal signal is amplified at least 1A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810565980.8A CN108508271B (en) | 2018-06-04 | 2018-06-04 | Frequency sweep impedance testing device for transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810565980.8A CN108508271B (en) | 2018-06-04 | 2018-06-04 | Frequency sweep impedance testing device for transformer |
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| CN108508271A true CN108508271A (en) | 2018-09-07 |
| CN108508271B CN108508271B (en) | 2021-01-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244127A (en) * | 2019-07-30 | 2019-09-17 | 广东电网有限责任公司 | A kind of the frequency sweep impedance test device and method of transformer |
| CN111624404A (en) * | 2020-05-08 | 2020-09-04 | 西安交通大学 | Online transformer impedance spectrum measurement system and measurement method |
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2018
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| CN1776441A (en) * | 2005-11-30 | 2006-05-24 | 上海市电力公司 | Device for detecting transformer winding state utilizing sweep frequency power source exciting |
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| CN107037313A (en) * | 2016-11-28 | 2017-08-11 | 国家电网公司 | The method for setting up deformation of transformer winding failure and frequency sweep impedance characteristic corresponding relation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244127A (en) * | 2019-07-30 | 2019-09-17 | 广东电网有限责任公司 | A kind of the frequency sweep impedance test device and method of transformer |
| CN110244127B (en) * | 2019-07-30 | 2021-03-12 | 广东电网有限责任公司 | Device and method for testing frequency sweeping impedance of transformer |
| CN111624404A (en) * | 2020-05-08 | 2020-09-04 | 西安交通大学 | Online transformer impedance spectrum measurement system and measurement method |
| CN111624404B (en) * | 2020-05-08 | 2022-04-05 | 西安交通大学 | Online transformer impedance spectrum measurement system and measurement method |
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| Publication number | Publication date |
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| CN108508271B (en) | 2021-01-26 |
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