CN109765455A - A kind of transformer winding detection platform and its operating method based on harmonic source - Google Patents
A kind of transformer winding detection platform and its operating method based on harmonic source Download PDFInfo
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- CN109765455A CN109765455A CN201910152691.XA CN201910152691A CN109765455A CN 109765455 A CN109765455 A CN 109765455A CN 201910152691 A CN201910152691 A CN 201910152691A CN 109765455 A CN109765455 A CN 109765455A
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- harmonic source
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Abstract
The invention discloses a kind of transformer winding detection platform and its operating method based on harmonic source, comprising: control system, harmonic source, acceleration transducer, A/D data collecting card and vibration test system；The control signal output of control system is connected with the signal input part of harmonic source, and the electric signal of harmonic source output is used for the input as measurement main body；Acceleration transducer is installed on measurement body surfaces；The output end of acceleration transducer is connected with the input terminal of A/D data collecting card, and A/D data collecting card is used to received vibration signal being converted to digital signal；The output end of A/D data collecting card is connected with the data input pin of vibration test system.Detection platform of the invention can be used in transformer winding and loosen and deform failure, can show vibration frequency response function of the transformer winding in wide-band excitation range, can obtain the operating status of transformer winding.
Description
Technical field
The invention belongs to transformer winding detection technique field, in particular to a kind of transformer winding inspection based on harmonic source
Survey platform and its operating method.
Background technique
In the power system, can power transformer carries conversion voltage and distributes the vital task of electric energy, normal
Work decides the reliability and stability of electric system.Long-term running power transformer is easy to produce various failures, wherein
Loosening, the deformation of transformer winding are most commonly seen, these failures will have a negative impact to transformer station high-voltage side bus.Existing transformer
Winding deformation detection platform can only apply single-frequency electric current, and frequency is lower, generally can only achieve 300Hz, cannot have comprehensively
Effect ground shows vibration frequency response function of the transformer winding in wide-band excitation range.
To sum up, it would be highly desirable to a kind of novel test platform that deformation failure is loosened for detecting transformer winding.
Summary of the invention
The purpose of the present invention is to provide a kind of transformer winding detection platform and its operating method based on harmonic source, with
Solve above-mentioned one or more technical problems.Detection platform of the invention can be used in finding the loosening of transformer winding
With deformation failure, vibration frequency response function of the transformer winding in wide-band excitation range can be measured, can obtain transformer around
The operating status of group.
In order to achieve the above objectives, the invention adopts the following technical scheme:
A kind of transformer winding detection platform based on harmonic source, comprising: control system, harmonic source, acceleration transducer,
A/D data collecting card and vibration test system；
Control system is used to adjust the electric current and frequency of harmonic source；The control signal output of control system and harmonic source
Signal input part is connected, and the electric signal of harmonic source output is used for the input as measurement main body；
Acceleration transducer is installed on measurement body surfaces, for acquiring the vibration signal of winding in measurement main body；
The output end of acceleration transducer is connected with the input terminal of A/D data collecting card, and A/D data collecting card is used for will
Received vibration signal is converted to digital signal；The output end of A/D data collecting card and the data input pin of vibration test system
It is connected.
A further improvement of the present invention is that, further includes: default transformer；
The electric signal of harmonic source output is applied on default transformer, and the electric signal after presetting transformer conversion is used for conduct
Measure the input of main body.
A further improvement of the present invention is that default transformer is intermediate-frequency transformer.
A further improvement of the present invention is that default transformer is dry type intermediate-frequency transformer.
A further improvement of the present invention is that acceleration transducer is piezoelectric type vibration acceleration transducer.
A further improvement of the present invention is that acceleration transducer is uniaxial or three axis piezoelectric type vibration acceleration sensings
Device.
A further improvement of the present invention is that, further includes: PC terminal；Control system and vibration test system load on PC end
End.
A kind of operating method of transformer winding detection platform based on harmonic source of the invention, comprising the following steps:
Step 1, acceleration transducer is arranged in the predeterminated position on transformer-cabinet surface to be measured；
Step 2, the exciting current that harmonic source can be changed to transformer injected frequency to be measured is controlled by control system；
Step 3, the vibration signal for obtaining transformer winding to be measured obtains excitation and rings after analyzing by vibration test system
Functional relation is answered, transformer winding detection to be measured is completed.
Wherein, the acceleration responsive that acceleration transducer measures and exciting current it is square directly proportional.
Further, in step 3, by the vibration frequency response under the vibration frequency response function and health status that are obtained under test mode
Transformer winding detection to be measured is completed in the comparison of function.
Compared with prior art, the invention has the following advantages:
Detection platform of the invention, with the exciting current that harmonic source can be changed to transformer winding injected frequency, in transformer
Tank surface arranges that acceleration transducer acquires vibration signal, and thus to obtain vibration acceleration frequency response function；Frequency response will be vibrated
After function comparative analysis, the Vibration Condition and machine performance of transformer winding can be obtained.Platform of the invention can detect in difference
The vibration frequency response function of the lower transformer winding of excitation, it can be achieved that power hammer act under mechanical excitation and different frequency electric current electricity
The comparison of excitation.
Common winding detection platform generally only measures the single response under single-frequency excitation, and winding of the invention is examined
The harmonic source of wide-band exciting current can be provided by surveying platform use；Compared with prior art, the present invention can widen the frequency of response
Section obtains the vibration frequency response curve of different frequency range, more fully reflects the basket vibration situation of transformer.Platform of the invention is adopted
Vibration method of frequency response method has higher sensitivity, the especially variation in winding deformation and pretightning force compared with frequency response method
Aspect has good detection effect.
Further, for transformer fault detection and the deficiency of conventional vibration signal time frequency analysis, present invention use can
Multifrequency to provide wide-band frequency sweep synthesizes power supply as excitation harmonic source, can input the excitation electricity that frequency is up to 2500Hz
Stream can apply crossing current swept frequency excitation for transformer winding, widen frequency range, obtain more complete transformer winding operating status
Information.
Detailed description of the invention
Fig. 1 is a kind of structural schematic block diagram of transformer winding detection platform based on harmonic source of the embodiment of the present invention；
When Fig. 2 is that No. 1 measuring point exciting current is 60A in the embodiment of the present invention, the comparison of health status and the state of loosening is shown
It is intended to；
When Fig. 3 is that No. 1 measuring point exciting current is 80A in the embodiment of the present invention, the comparison of health status and the state of loosening is shown
It is intended to；
When Fig. 4 is that No. 1 measuring point exciting current is 100A in the embodiment of the present invention, the comparison of health status and the state of loosening is shown
It is intended to.
Specific embodiment
In order to which the technical problems, technical solutions and beneficial effects solved by the present invention is more clearly understood, below in conjunction with
The present invention will be described in further detail for the drawings and specific embodiments.It should be appreciated that the specific embodiments described herein
It is only used to explain the present invention, be not intended to limit the present invention.
Referring to Fig. 1, a kind of transformer winding detection platform based on harmonic source of the embodiment of the present invention, comprising: control
System, harmonic source, default transformer, acceleration transducer, A/D data collecting card and PC terminal.
Control system is used to adjust the electric current and frequency of harmonic source, and Control System Software and harmonic source are same company
Auxiliary products can be realized by the way that Control System Software to be loaded on computer.
The control signal output of control system is connected with the signal input part of harmonic source, the electric signal of harmonic source output
It is applied on default transformer, presets transformer for the electric signal input measurement main body after conversion.
The collection terminal of acceleration transducer is installed on measurement body surfaces, for acquiring the vibration letter of winding in measurement main body
Number；The output end of acceleration transducer is connected with the input terminal of A/D data collecting card, and A/D data collecting card is by received vibration
Dynamic signal is converted to digital signal, and is transmitted in the power transformer sound and vibration detecting and analysing system of PC terminal computer.
Harmonic source of the harmonic source using the electrical Science and Technology Ltd.'s production of Shanghai Qian Li in the embodiment of the present invention, output
Power is 180kVA, and output frequency is 50~2500Hz, and output voltage is 0~340V, the power utilization high speed FPGA and DSP
Digital chip technology realizes and injects to the different frequency electric current of transformer winding, and can amplitude and phase to different frequency electric current
Position is independently controlled, and simulates realistically the state of transformer winding in actual work.
Default transformer in the embodiment of the present invention is dry type intermediate-frequency transformer, rated capacity 240kVA, specified input
Voltage is 340V, and specified input current is 705.88A；High-pressure side can change series-parallel winding by 12 and constitute, individually around
The voltage rating of group is that 600V, output-current rating 34A can make to export by changing the series and parallel structure of high-voltage winding
Voltage and current is more matched with tested transformer, improves the load capability of power supply.
Measurement main body in the embodiment of the present invention is transformer to be tested.
Acceleration transducer in the embodiment of the present invention is specially uniaxial or three axis piezoelectric type vibration acceleration transducers,
The sensor bulk is small, light-weight, stability is high, operating frequency range is wide, can under the adverse circumstances such as high-intensity magnetic field, high current work
Make, is highly suitable for using in this platform.Using piezoelectric material, charge can be generated on surface after stress, convenient for measuring force or
The non-electrical physical quantity of power can be converted to, is used to measure vibration signal in detection platform of the invention.
A/D data collecting card in the embodiment of the present invention can convert analog signal to digital signal, detection of the invention
It is that collected voltage signal is converted into digital signal in platform, in system, is handled to input computer.
PC terminal in the embodiment of the present invention: it is carried out in the signal and input transformer vibration test system after collecting conversion
Data processing.
The workflow of detection platform of the invention are as follows:
By the exciting current of harmonic source output different frequency, by injecting transformer to be measured after intermediate-frequency transformer transformation；?
Choose symmetrical several vibration signal data collection points, the piezoelectric type vibration of arrangement single shaft or three axis in transformer-cabinet surface to be measured
Acceleration transducer acquires transformer vibration signal by sensor, and inputs A/D capture card, is converted into digital signal；It will be digital
Signal is transmitted to PC terminal, acquires data using vibration test system, finally draws vibration frequency response function curve by data and divides
Analyse result.The vibration frequency response function of transformer winding is obtained by power transformer sound and vibration detecting and analysing system, according to test mode
Under vibration frequency response function and health status under vibration frequency response function comparison, can detecte transformer winding loosening, become
The failures such as shape and its degree.
A kind of operating method of transformer winding detection platform based on harmonic source of the invention, the present invention is using vibration frequency
The method of sound measures, and specifically includes:, can to transformer injected frequency by harmonic source in transformer-cabinet surface layout collection point
The exciting current of change obtains the vibration signal of transformer winding, the method for excitation and receptance function relationship is obtained after analysis.Vibration
The response curve frequency range that method of frequency response method obtains is wider, can completely obtain the Frequency Response of transformer winding；Furthermore frequency response is vibrated
The sensitivity of method is very high, is especially suitable for the variation of detection winding deformation and pretightning force.To the axial vibration equation both ends of transformer
Fourier transformation is carried out, the ratio between exciting current and the vibration acceleration square of application H can be obtained1(ω), as transformer around
The vibration frequency response function of group, knows the acceleration responsive and exciting current that measure in transformer-cabinet surface layout sensor by the formula
It is square directly proportional.
In conclusion the present invention is directed to the deficiency of transformer fault detection, provide a kind of based on vibration frequency response function
Deformation of transformer winding detection platform is loosened, can be used for the detection that transformer winding loosens, deforms failure.The present invention is with harmonic source
The exciting current that can be changed to transformer winding injected frequency, is obtained using the piezoelectric vibration pickup of transformer-cabinet surface layout
Vibration signal is taken, can get the vibration frequency response function curve of transformer winding through analyzing, transformer can finally be obtained by comparison
The operating status of winding.The comparison of transformer winding vibration frequency response function under different energisation modes can be achieved in the present invention；It will vibration
Acceleration sensor axis detects transformer in different operating conditions to transformer winding surface is installed on, by vibration acceleration sensor
The vibration signal of lower transformer winding；The comparison of transformer winding vibration frequency response function under different energisation modes, and then realize and become
The related coefficient of depressor vibration frequency response function analyzes transformer winding machine performance.This platform structure is simple, is convenient for group
Dress；It only include piezoelectric type single shaft and three axis vibration sensors, A/D data collecting card and terminal meter in addition to measuring main body transformer
Calculation machine.
Application of the invention:
Platform of the invention studies transformer based on vibration method of frequency response method using the exciting current of harmonic source injection different frequency
The Vibration Condition of winding obtains machine performance different when transformer winding is run according to the variation of vibration frequency response function, accordingly
It can determine whether transformer winding the failures such as is deformed, loosens.
Embodiment is as follows:
In order to probe into the relationship that transformer winding vibration frequency response function and its loosen state, measure under four kinds of loosening states,
When exciting current is 60A, 80A and 100A, driving frequency vibrates frequency response letter from the transformer of 50Hz-1000Hz (step-length 10Hz)
Number.For taking No. 1 measuring point (CH0), as a result as 2 to shown in Fig. 4.
By Fig. 2 to Fig. 4, can be clear that the formant of No. 1 measuring point, full frequency band have 260Hz, 300Hz, 620Hz,
The several natural frequency values of 740Hz, 910Hz, 960Hz.In addition, the difference of four loosening condition curves and health status curve can also
Whether loosened with characterizing winding, aeration level etc..Therefore, continue the utilization phase relation proposed in simplex winding model test herein
Number assessment thought, calculate loosen and health status under vibrate frequency response function amplitude between related coefficient, judge transformer around
The looseness fault of group.
The above description is merely a specific embodiment, but application range of the invention is not limited thereto, any
Belong to those skilled in the art in the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, all answers
Cover within application range of the invention.Therefore, application range of the invention should be subject to the protection scope in claims.
Claims (10)
1. a kind of transformer winding detection platform based on harmonic source characterized by comprising control system, harmonic source, acceleration
Spend sensor, A/D data collecting card and vibration test system；
Control system is used to adjust the electric current and frequency of harmonic source；The control signal output of control system and the signal of harmonic source
Input terminal is connected, and the electric signal of harmonic source output is used for the input as measurement main body；
Acceleration transducer is installed on measurement body surfaces, for acquiring the vibration signal of winding in measurement main body；
The output end of acceleration transducer is connected with the input terminal of A/D data collecting card, and A/D data collecting card will be for that will receive
Vibration signal be converted to digital signal；The output end of A/D data collecting card is connected with the data input pin of vibration test system
It connects.
2. a kind of transformer winding detection platform based on harmonic source according to claim 1, which is characterized in that also wrap
It includes: default transformer；
The electric signal of harmonic source output is applied on default transformer, and the electric signal after presetting transformer conversion is used for as measurement
The input of main body.
3. a kind of transformer winding detection platform based on harmonic source according to claim 2, which is characterized in that default to become
Depressor is intermediate-frequency transformer.
4. a kind of transformer winding detection platform based on harmonic source according to claim 2, which is characterized in that default to become
Depressor is dry type intermediate-frequency transformer.
5. a kind of transformer winding detection platform based on harmonic source according to claim 1, which is characterized in that acceleration
Sensor is piezoelectric type vibration acceleration transducer.
6. a kind of transformer winding detection platform based on harmonic source according to claim 1, which is characterized in that acceleration
Sensor is uniaxial or three axis piezoelectric type vibration acceleration transducers.
7. a kind of transformer winding detection platform based on harmonic source according to claim 1, which is characterized in that also wrap
It includes: PC terminal；
Control system and vibration test system load on PC terminal.
8. a kind of operating method of transformer winding detection platform based on harmonic source described in claim 1, which is characterized in that
The following steps are included:
Step 1, acceleration transducer is arranged in the predeterminated position on transformer-cabinet surface to be measured；
Step 2, the exciting current that harmonic source can be changed to transformer injected frequency to be measured is controlled by control system；
Step 3, the vibration signal for obtaining transformer winding to be measured obtains excitation and response letter after analyzing by vibration test system
Transformer winding detection to be measured is completed in number relationship, comparison.
9. a kind of operating method of transformer winding detection platform based on harmonic source according to claim 8, feature
Be, the acceleration responsive that acceleration transducer measures and exciting current it is square directly proportional.
10. a kind of operating method of transformer winding detection platform based on harmonic source according to claim 8, feature
It is, in step 3, the comparison for vibrating frequency response function vibrated under frequency response function and health status that will be obtained under test mode,
Complete transformer winding detection to be measured.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111024376A (en) * | 2019-11-27 | 2020-04-17 | 国网江苏省电力有限公司电力科学研究院 | System and method for detecting defects of electrical equipment by using sweep frequency impact current |
| CN112556828A (en) * | 2020-11-20 | 2021-03-26 | 国网天津市电力公司电力科学研究院 | Transformer winding loosening fault detection method |
| CN113916346A (en) * | 2021-11-14 | 2022-01-11 | 广东电网有限责任公司江门供电局 | Power distribution equipment identification method with triaxial vibration attitude data judgment function |
| CN114485540A (en) * | 2022-01-20 | 2022-05-13 | 西安交通大学 | Method and system for rapidly acquiring deformation degree and position of transformer winding |
| CN114563165A (en) * | 2022-04-27 | 2022-05-31 | 成都盛及航空科技发展有限公司 | Landing lamp test device, system, method and storage medium |
| CN114859274A (en) * | 2022-07-08 | 2022-08-05 | 成都工百利自动化设备有限公司 | Transformer winding deformation online monitoring method and electronic device |
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| CN105699838A (en) * | 2016-01-28 | 2016-06-22 | 云南电网有限责任公司电力科学研究院 | A voltage transformer winding state detection method and an apparatus thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111024376A (en) * | 2019-11-27 | 2020-04-17 | 国网江苏省电力有限公司电力科学研究院 | System and method for detecting defects of electrical equipment by using sweep frequency impact current |
| CN112556828A (en) * | 2020-11-20 | 2021-03-26 | 国网天津市电力公司电力科学研究院 | Transformer winding loosening fault detection method |
| CN113916346A (en) * | 2021-11-14 | 2022-01-11 | 广东电网有限责任公司江门供电局 | Power distribution equipment identification method with triaxial vibration attitude data judgment function |
| CN113916346B (en) * | 2021-11-14 | 2023-11-17 | 广东电网有限责任公司江门供电局 | Distribution equipment identification method with triaxial vibration attitude data judgment function |
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| CN114563165A (en) * | 2022-04-27 | 2022-05-31 | 成都盛及航空科技发展有限公司 | Landing lamp test device, system, method and storage medium |
| CN114563165B (en) * | 2022-04-27 | 2022-07-12 | 成都盛及航空科技发展有限公司 | Landing lamp test device, system, method and storage medium |
| CN114859274A (en) * | 2022-07-08 | 2022-08-05 | 成都工百利自动化设备有限公司 | Transformer winding deformation online monitoring method and electronic device |
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