CN108508271A - A kind of transformer frequency sweep impedance test device - Google Patents

A kind of transformer frequency sweep impedance test device Download PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
transformer
output
power amplifier
input terminal
connect
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201810565980.8A
Other languages
Chinese (zh)
Other versions
CN108508271B (en
Inventor
周丹
孙文星
杨贤
林春耀
马志钦
魏征
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electric Power Research Institute of Guangdong Power Grid Co Ltd
Original Assignee
Electric Power Research Institute of Guangdong Power Grid Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electric Power Research Institute of Guangdong Power Grid Co Ltd filed Critical Electric Power Research Institute of Guangdong Power Grid Co Ltd
Priority to CN201810565980.8A priority Critical patent/CN108508271B/en
Publication of CN108508271A publication Critical patent/CN108508271A/en
Application granted granted Critical
Publication of CN108508271B publication Critical patent/CN108508271B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring 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

A kind of transformer frequency sweep impedance test device
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.
CN201810565980.8A 2018-06-04 2018-06-04 Frequency sweep impedance testing device for transformer Active CN108508271B (en)

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

Applications Claiming Priority (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

Publications (2)

Publication Number Publication Date
CN108508271A true CN108508271A (en) 2018-09-07
CN108508271B CN108508271B (en) 2021-01-26

Family

ID=63402756

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810565980.8A Active CN108508271B (en) 2018-06-04 2018-06-04 Frequency sweep impedance testing device for transformer

Country Status (1)

Country Link
CN (1) CN108508271B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN105004260A (en) * 2015-07-02 2015-10-28 贵阳供电局 Method for deformation test of transformer winding by utilization of frequency sweep short circuit impedance method
CN105445553A (en) * 2015-11-12 2016-03-30 广东电网有限责任公司电力科学研究院 Method for precisely acquiring short-circuit impedance value of transformer at 50Hz
CN106771625A (en) * 2017-02-28 2017-05-31 国网陕西省电力公司电力科学研究院 A kind of frequency sweep impedance test system of low-power consumption
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN105004260A (en) * 2015-07-02 2015-10-28 贵阳供电局 Method for deformation test of transformer winding by utilization of frequency sweep short circuit impedance method
CN105445553A (en) * 2015-11-12 2016-03-30 广东电网有限责任公司电力科学研究院 Method for precisely acquiring short-circuit impedance value of transformer at 50Hz
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
CN106771625A (en) * 2017-02-28 2017-05-31 国网陕西省电力公司电力科学研究院 A kind of frequency sweep impedance test system of low-power consumption

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
连贯: "基于C8051F系列单片机的变压器绕组变形测试仪的研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 *

Cited By (4)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
CN108508271B (en) 2021-01-26

Similar Documents

Publication Publication Date Title
James et al. Development of computer-based measurements and their application to PD pattern analysis
CN101556302B (en) Ultrasound partial discharge diagnostic equipment and method thereof
CN108508271A (en) A kind of transformer frequency sweep impedance test device
CN102135593A (en) On-line diagnosis and evaluation method of insulation state of large electric machine
CN111007450A (en) Method for detecting result reliability of load identification equipment
CN107167693A (en) A kind of resistive current of gapless metal-oxide lighting arrester inversion method and device
CN103336186A (en) Method for testing transformer equipment without disassembling lead
CN108037449A (en) A kind of high-voltage circuitbreaker automatic checkout system
CN104237727B (en) Transformer near-region short circuit signal monitoring device and short circuit recording analysis method
CN107918092A (en) A kind of temporary electric discharge quantity measuring method of partial discharge of switchgear
CN205720418U (en) High tension cable circulating current detector
CN106932699A (en) A kind of GIS oscillatory surges pressure test signal detection system
Abu-Siada et al. Impact of transformer model parameters variation on FRA signature
CN106338237A (en) Transformer winding deformation detection method based on frequency response impedance method
CN102645574A (en) On-site transient overvoltage measuring method based on network transfer function calculation
CN111157864B (en) Partial discharge ultrasonic signal and map recognition system and method
CN105974353A (en) Mutual inductor amplitude and phase detection method based on virtual instrument
CN201319063Y (en) Detecting and analyzing device of relay protection testing device
CN104111027B (en) Lissajous figure analytical method based transformer power frequency signal sensor system
CN107576259A (en) Deformation of transformer winding online test method based on very fast transient overvoltage characteristic
CN202512199U (en) Measuring device for identifying partial discharge modes of transformer
CN105116199A (en) High precision automatic function testing device of rail transit sensor
CN113358914B (en) Voltage measurement circuit, voltage measurement method thereof and voltage measurement equipment
CN110794344B (en) Frequency response test method for transformer winding deformation with influence of sleeve eliminated
Tomlain et al. Experimental Verification of the Fully-Digital High Voltage FPGA-Based Diagnostic Equipment

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant