CN202041583U - Sweep-frequency measuring device for short-circuit impedance of transformer - Google Patents

Sweep-frequency measuring device for short-circuit impedance of transformer Download PDF

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Publication number
CN202041583U
CN202041583U CN2011200718767U CN201120071876U CN202041583U CN 202041583 U CN202041583 U CN 202041583U CN 2011200718767 U CN2011200718767 U CN 2011200718767U CN 201120071876 U CN201120071876 U CN 201120071876U CN 202041583 U CN202041583 U CN 202041583U
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China
Prior art keywords
power amplifier
transformer
winding
circuit impedance
voltage
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Expired - Lifetime
Application number
CN2011200718767U
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Chinese (zh)
Inventor
邓彦国
弓艳朋
许渊
刘有为
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State Grid Corp of China SGCC
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China Electric Power Research Institute Co Ltd CEPRI
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Priority to CN2011200718767U priority Critical patent/CN202041583U/en
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Publication of CN202041583U publication Critical patent/CN202041583U/en
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Expired - Lifetime legal-status Critical Current

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Abstract

The utility model belongs to the field of deformation measurement of a winding of a transformer, and particularly relates to a sweep-frequency measuring device for short-circuit impedance of a transformer. The measuring device comprises a signal generator, a power amplifier, a voltmeter, an ammeter and testing wire clamping pliers; the output end of the signal generator is connected with the input end of the power amplifier; the output end of the power amplifier is connected with a measured winding of a transformer; the ammeter is connected in series between the power amplifier and the measured winding of the transformer to measure the current effective value of an applied signal; the voltmeter is connected in parallel between two ends of the measured winding to measure the voltage effective value of the applied signal; the signal generator generates an excitation signal with the frequency ranging from 10 Hz to 1 kHz; and the amplitude values of the voltage and the current of the excitation signal are adjusted and amplified by the power amplifier. The measuring device has the characteristics of simple structure and convenience in use, and can measure short-circuit impedance under different frequencies.

Description

The sweep measurement device of transformer short-circuit impedance
Technical field
The utility model belongs to the deformation of transformer winding fields of measurement, is specifically related to a kind of sweep measurement device of transformer short-circuit impedance.
Background technology
Deformation of transformer winding can cause the variation of built-in electrical insulation structure, is one of main reason that causes transformer fault.At present, the method for diagnosis deformation of transformer winding mainly contains frequency response method and short circuit impedance method, and two kinds of methods have played positive effect to finding the transformer defective.Two kinds of methods have in fact all adopted the otherness method of discrimination, and judge the winding deformation situation by the size of difference, and testing requirements is carried out under identical experiment condition as far as possible.When but frequency response method was used at the scene, the result was subject to interference, wiring and the influence of other uncertain factor, and shortcoming determination methods directly perceived and accurate does not form simple and clear quantifiable criterion in the diagnosis.The electric current that the short circuit impedance method requirement provides will reach or near rated current, used testing equipment capacity is bigger, is difficult at the scene carry out.
The utility model content
In order to overcome the above-mentioned defective of prior art, the purpose of this utility model is to propose a kind of simple in structure, not only sweep measurement device of the transformer short-circuit impedance of energy measurement short-circuit impedance but also energy measurement frequency response.
For this reason, the utility model is achieved through the following technical solutions:
A kind of sweep measurement device of transformer short-circuit impedance, it is characterized in that: this measurement mechanism comprises signal generator, power amplifier, voltage table and reometer and test clamp pincers, the output terminal of described signal generator connects the input end of power amplifier, and the output terminal of described power amplifier links to each other with the tested winding of transformer; Described reometer is series between the tested winding of power amplifier and transformer, measures the current effective value that applies signal; Described voltage table is parallel to the two ends of tested winding, measures to apply the voltage of signals effective value; Described signal generator produces the pumping signal of frequency from 10Hz to 1kHz, and described power amplifier is regulated the voltage and current amplitude of this pumping signal and amplified.
Wherein, the output terminal of described power amplifier connects test clamp pincers by lead, and the tested winding of described test clamp clipper joint transformer is used for measuring the voltage effective value at tested winding two ends and flows through the current effective value of tested winding.
Wherein, the pumping signal of described signal generator generation is a sinusoidal excitation signal.
Wherein, the voltage magnitude that described power amplifier is regulated pumping signal is amplified to 90V, and the current amplitude of regulating pumping signal is amplified to 1A.
The beneficial effects of the utility model are: this measurement mechanism has characteristics simple in structure, easy to use, can realize the measurement to short-circuit impedance under the different frequency.
This measurement mechanism is to propose according to frequency response method and short-circuit impedance ratio juris and in conjunction with the two advantage, signal generator in this measurement mechanism can produce the pumping signal (being swept-frequency signal) of different frequency, measure the short-circuit impedance under the different frequency, can overcome the defective that only produces power frequency component in the short circuit impedance method, the mode of connection still adopts the mode of connection of short circuit impedance method.
Description of drawings
Fig. 1 is that the pressurized winding of detection is the test wiring diagram of the three-phase transformer of Yn wiring;
Fig. 2 is that the pressurized winding of detection is the test wiring diagram of the three-phase transformer of Y wiring;
Fig. 3 is that the pressurized winding of detection is the test wiring diagram of the three-phase transformer of Δ wiring.
Embodiment
Below in conjunction with accompanying drawing measurement mechanism of the present utility model is done further detailed description.
The sweep measurement device of transformer short-circuit impedance described in the utility model comprises signal generator, power amplifier, voltage table, reometer and test clamp pincers.Signal generator is used to export the sinusoidal excitation signal of 10Hz to 1kHz; Power amplifier is used for that voltage effective value with sinusoidal excitation signal is amplified to 90V or electric current is amplified to 1A; Voltage table is gathered the voltage that tested winding two ends apply; Reometer is gathered the electric current that tested winding applies.In the measuring process, when the frequency of pumping signal changes from 10Hz to 1kHz, adjusting power amplifier makes voltage and current in tolerance interval, and measure the voltage effective value at tested winding two ends and the current effective value of tested winding simultaneously, record frequency, test voltage and measuring current at this moment can obtain the short-circuit impedance under the different frequency.Under the situation of time permission, should suitably reduce the frequency sweep step-length.
This measurement mechanism can be realized the short-circuit impedance measurement under the different frequency, its not only energy measurement short-circuit impedance but also energy measurement frequency response.
Embodiment 1
As shown in Figure 1, be example with the test of A-O winding, behind all terminals of short circuit offside winding (non-tested winding open circuit), power amplifier output is added on the terminal of A-O, the output frequency of conditioning signal generator begins test from 10Hz.Measuring current is 1A, in the time can't reaching 1A because of power amplifier output voltage restriction measuring current, adopting the 80%-90% of power amplifier rated output voltage is test voltage (damaging instrument in test process), continue regulating frequency and test, reach 1kHz until test frequency.Recording frequency value and corresponding test voltage value, measuring current value in the test process.The test class of the test of B-O, C-O winding and A-O winding seemingly.
Embodiment 2
As shown in Figure 2, be example with the test of A-B winding, behind all terminals of short circuit offside winding (non-tested winding open circuit), power amplifier output is added on the terminal of A-B.According to the requirement to voltage, electric current, frequency in the embodiment one signal generator and power amplifier are regulated.Recording frequency value and corresponding test voltage value, measuring current value in the test process.Measurement result is A phase and B series connection short-circuit impedance mutually.The test class of the test of B-C, C-A winding and A-B winding seemingly.Measurement result can obtain the short-circuit impedance of single winding through converting.
Embodiment 3
As shown in Figure 3, be example with A-B winding test, behind all terminals of short circuit offside winding (non-tested winding open circuit), and short circuit B, C phase, power amplifier output is added on the terminal of A-B.According to the requirement to voltage, electric current, frequency in the embodiment one signal generator and power amplifier are regulated.Recording frequency value and corresponding test voltage value, measuring current value in the test process.Measurement result is AB phase and BC short-circuit impedance in parallel mutually.The test class of the test of B-C, C-A winding and A-B winding seemingly.Measurement result can obtain the short-circuit impedance of single winding through converting.
Should be noted that at last: above embodiment only is not intended to limit in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to the foregoing description, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement embodiment of the present utility model, and do not break away from any modification of the utility model spirit and scope or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims (4)

1. the sweep measurement device of a transformer short-circuit impedance, it is characterized in that: this measurement mechanism comprises signal generator, power amplifier, voltage table and reometer and test clamp pincers, the output terminal of described signal generator connects the input end of power amplifier, and the output terminal of described power amplifier links to each other with the tested winding of transformer; Described reometer is series between the tested winding of power amplifier and transformer, measures the current effective value that applies signal; Described voltage table is parallel to the two ends of tested winding, measures to apply the voltage of signals effective value; Described signal generator produces the pumping signal of frequency from 10Hz to 1kHz, and described power amplifier is regulated the voltage and current amplitude of this pumping signal and amplified.
2. the sweep measurement device of transformer short-circuit impedance according to claim 1, it is characterized in that: the output terminal of described power amplifier connects test clamp pincers by lead, the tested winding of described test clamp clipper joint transformer is used for measuring the voltage effective value at tested winding two ends and flows through the current effective value of tested winding.
3. the sweep measurement device of transformer short-circuit impedance according to claim 1 and 2 is characterized in that: the pumping signal that described signal generator produces is a sinusoidal excitation signal.
4. the sweep measurement device of transformer short-circuit impedance according to claim 1 and 2 is characterized in that: the voltage magnitude that described power amplifier is regulated pumping signal is amplified to 90V, and the current amplitude of regulating pumping signal is amplified to 1A.
CN2011200718767U 2011-03-17 2011-03-17 Sweep-frequency measuring device for short-circuit impedance of transformer Expired - Lifetime CN202041583U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011200718767U CN202041583U (en) 2011-03-17 2011-03-17 Sweep-frequency measuring device for short-circuit impedance of transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011200718767U CN202041583U (en) 2011-03-17 2011-03-17 Sweep-frequency measuring device for short-circuit impedance of transformer

Publications (1)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103792462A (en) * 2014-01-15 2014-05-14 国家电网公司 Power transformer winding turn-to-turn short circuit failure detecting method based on resistance frequency curve
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
CN110057283A (en) * 2019-03-11 2019-07-26 国网江苏省电力有限公司淮安供电分公司 A kind of deformation of transformer winding intelligent detecting method based on short-circuit reactance
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
CN110645888A (en) * 2019-10-18 2020-01-03 国网辽宁省电力有限公司抚顺供电公司 Winding deformation judgment method based on frequency response analysis FRA
CN112180147A (en) * 2020-09-25 2021-01-05 加特兰微电子科技(上海)有限公司 Power amplifier output impedance abnormity detection method, detection device and related device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103792462A (en) * 2014-01-15 2014-05-14 国家电网公司 Power transformer winding turn-to-turn short circuit failure detecting method based on resistance frequency curve
CN103792462B (en) * 2014-01-15 2017-01-18 国家电网公司 Power transformer winding turn-to-turn short circuit failure detecting method based on resistance frequency curve
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
CN110057283A (en) * 2019-03-11 2019-07-26 国网江苏省电力有限公司淮安供电分公司 A kind of deformation of transformer winding intelligent detecting method based on short-circuit reactance
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
CN110645888A (en) * 2019-10-18 2020-01-03 国网辽宁省电力有限公司抚顺供电公司 Winding deformation judgment method based on frequency response analysis FRA
CN112180147A (en) * 2020-09-25 2021-01-05 加特兰微电子科技(上海)有限公司 Power amplifier output impedance abnormity detection method, detection device and related device

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ASS Succession or assignment of patent right

Owner name: STATE GRID CORPORATION OF CHINA

Free format text: FORMER OWNER: CHINA ELECTRIC POWER RESEARCH INSTITUTE

Effective date: 20140321

Owner name: CHINA ELECTRIC POWER RESEARCH INSTITUTE

Effective date: 20140321

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Effective date of registration: 20140321

Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing

Patentee after: State Grid Corporation of China

Patentee after: China Electric Power Research Institute

Address before: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15

Patentee before: China Electric Power Research Institute

CX01 Expiry of patent term
CX01 Expiry of patent term

Granted publication date: 20111116