CN203759208U - Transformer on-load tapping switch detection device - Google Patents
Transformer on-load tapping switch detection device Download PDFInfo
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- CN203759208U CN203759208U CN201420070693.7U CN201420070693U CN203759208U CN 203759208 U CN203759208 U CN 203759208U CN 201420070693 U CN201420070693 U CN 201420070693U CN 203759208 U CN203759208 U CN 203759208U
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- voltage
- frequency
- frequency multiplication
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Abstract
The utility model discloses a transformer on-load tapping switch detection device comprising an input power supply, an input power supply control switch, a central control and data processor, a frequency multiplication voltage generator and an isolation driving module. When the power supply control switch is connected, the frequency multiplication voltage generator outputs test voltage which passes through a secondary filter circuit and an output control switch and then is applied to the two ends of the tested on-load tapping switch. When the tested on-load tapping switch acts, a voltage and current sensor works, and the acquired data are processed via the central control and data processor and then transmitted to a computer to display. According to the detection device, pure contact resistance and switch action characteristics of the on-load tapping switch in action of the on-load tapping switch can be effectively detected, factors of inductance and capacitance influencing measuring errors in the tested system can be eliminated, accuracy and precision of measurement are enhanced and uniqueness of measuring results is enhanced.
Description
Technical field
The utility model relates to the detection field of transformer auxiliary device, is specifically related to a kind of on-load tap changers of transformers pick-up unit, is applicable to the shunting switch Characteristics Detection test with load ratio bridging switch transformer.
Background technology
At present, high-power transformer accident rate takes place frequently, analyzing reason, to have 30% fault be due to on-load tap changers of transformers remarkable action, on-load tap changers of transformers be in transformer unique under high-voltage large current the parts of rapid movement, himself failure rate is relatively high, as its quality problems, the reasons such as assembly technology and operation maintenance are not in place cause tapping switch contact contact resistance to increase can be overheated when transformer moves, scaling loss, shunting switch handoff procedure extremely directly threatens the safe operation of transformer and electrical network, in preventive trial, on-load tap changers of transformers acting characteristic has been proposed to testing requirement for this reason, power industry mainly adopted direct current method to carry out on-load tap changers of transformers acting characteristic site test in the past, the domestic patent that relates to transformer on-load tap changer tester device is as " power transformer load tap changer comprehensive tester " patent No. 96218971 mostly based on direct current mode, " transformer on-load tap changer tester " patent No. 201010584656.4 grades are all instrument patents of testing based on direct current method, because DC experiment method is subject to oil film effect, in load ratio bridging switch handoff procedure, Transformer Winding is perception and produces reverse potential and cause input current vibration, the confidence level of test result is poor, test waveform often occurs without level, interrupted and jump problem, since power industry " DL/T265-2012 on-load tap changers of transformers site test guide rule " is promulgated, there is interchange detection method, the patent detecting for communication method is as " AC test device for transformer on-load tap-changer operating characteristic " patent No. 200910066429.X and the patent No. 200820030319.9, although alternating-current measurement has solved direct current method test existing problems, it is that Transformer Winding cannot be separated with load ratio bridging switch that but on-the-spot on-load tap changers of transformers acting characteristic detects, winding inductance and cannula tip capacitance variations during detection, affect accuracy of detection, test waveform still has certain deviation.
Utility model content
Goal of the invention: in order to overcome the deficiencies in the prior art, the utility model proposes a kind of on-load tap changers of transformers pick-up unit, can eliminate inductance, the impact of capacity effect problem on measurement result, improve the precision of measurement and the uniqueness of measurement result, for the correct assessment apparatus state that detects provides authentic and valid foundation.
Technical scheme: for solving the problems of the technologies described above, the utility model provides a kind of on-load tap changers of transformers pick-up unit, comprise input power, input power gauge tap, center-control and data processor, isolation drive module and frequency multiplication voltage generator, when the conducting of input power gauge tap, center-control and the output of data processor controlled isolation drive module drive frequency multiplication voltage generator preset the trial voltage of frequency, trial voltage is through secondary filtering circuit, output control switch is applied to tested load ratio bridging switch two ends by bushing shell for transformer and Transformer Winding, voltage, current sensor is connected with load ratio bridging switch, when tested load ratio bridging switch action, voltage, current sensor gathers load ratio bridging switch electric current, voltage, by being sent on computing machine and showing after center-control and data processor processes.
As preferably, described input power is unidirectional 220V alternating voltage; As preferably, described trial voltage is sinusoidal wave three-phase frequency multiplication voltage.
As preferably, described frequency multiplication voltage generator comprises input filter module, rectification module and three groups of single-phase inversion modules, input power is after input filter module filtered and rectification module rectification, enter three groups of single-phase inversion modules detection voltage is provided, detect voltage and be sent to output boostering transformer after by output filtering module filtered, output boostering transformer output frequency is the three-phase high voltage that presets frequency, it is that center-control and data processor are undertaken by controlling three groups of single-phase inversion modules of isolation drive module drive that three-phase frequency multiplication output voltage frequency is switched with controlling, three groups of single-phase inversion modules comprise A phase full-bridge inverting module, B phase full-bridge inverting module, C phase full-bridge inverting module.
The invention also discloses a kind of detection method of on-load tap changers of transformers pick-up unit, based on times frequency sine-wave, detect and utilize wave analysis and approximating method, the reactance of detected test product under frequency multiplication is had to X
2=2X
1, the value of resistance R, not with the feature of frequency change, utilizes following formula (a) to measured waveform analytical Calculation, and while realizing load ratio bridging switch action, its pure contact resistance and switch action characteristic effectively detect
2Z
1-Ζ
2=2×(R+jX
1)-(R+jX
2)=2×(R+jX
1)-(R+j2X
1)=R （a）
Wherein, Z
1and X
1being respectively frequency is f
1time corresponding impedance and reactance, Ζ
2and X
2being respectively frequency is f
2time corresponding impedance and reactance, f
2=2f
1; R is resistance.
This detection method, based on the disclosed pick-up unit of the utility model, comprises the following steps:
1) by center-control and the output of data processor controlled isolation drive module drive frequency multiplication voltage generator, presetting frequency is f
1sine voltage, utilize voltage-current sensor to gather load ratio bridging switch electric current, voltage, obtain impedance Z
1;
2) by center-control and the output of data processor controlled isolation drive module drive frequency multiplication voltage generator, presetting frequency is f
2sine voltage, f
2for f
1multiple to close be f
2=2f
1, utilize voltage-current sensor to gather load ratio bridging switch electric current, voltage, obtain impedance Z
2;
3) detect impedance Z=R+jX, X is the reactance value of detected system, X=ω L=2 π fL, and ω is angular frequency, and unit is rad/s, and f is frequency, and unit is Hz, and L is the inductance value of detection system, is certain value, and unit is H; R is for being detected the resistance (being mainly load ratio bridging switch contact resistance) of system, and unit is Ω, and when frequency multiplication detects, when input detects electric voltage frequency difference, X reactance is also different, testing result under frequency multiplication: reactance corresponding relation is X
2=2X
1, but the resistance value of R does not change with frequency shift.By formula below to measured waveform analytical Calculation, its pure contact resistance value variation characteristic in the time of can obtaining load ratio bridging switch action:
2Z
1-Ζ
2=2×(R+jX
1)-(R+jX
2)=2×(R+jX
1)-(R+j2X
1)=R （a）
Center-control and data processor according to formula (a) by obtain waveform according to not in the same time wave analysis calculate, when then data fitting obtains load ratio bridging switch action, its pure resistance value changes waveform, changes to have to judge more intuitively whether load ratio bridging switch acting characteristic and body have problems according to resistance R.
In the utility model, computing machine is connected with data processor with center-control with host computer interface by display interface device.
In the utility model, adopt two invertings of AC-DC-AC, by alternating current 220V power supply through input filter module, rectification, the combination of three groups of single-phase inversion modules and output filtering, step-up transformer booster tension, realize and detect that required frequency is constant, the pure sine wave three-phase frequency multiplication measuring voltage of voltage stabilization, simple in structure, for on-load tap changers of transformers acting characteristic accurately detects and provides safeguard.
In the utility model, each frequency data while utilizing frequency multiplication to detect compare, the correctness detecting is verified and verification, measurement mechanism is affected to measurement factor (as temperature drift, external interference signal etc.) to be revised, having reduced surveying instrument self affects measuring error factor, has improved accuracy and the precision measured.
Beneficial effect: a kind of on-load tap changers of transformers pick-up unit of the present utility model, compared with prior art, has the following advantages:
1, this apparatus structure is compact, and circuit is reliable and stable, and when load ratio bridging switch is moved, its resistance change characteristic detects, and has overcome measured system inductance, distributed capacitance effect problem, has improved on-load tap changers of transformers measuring accuracy;
2, the two inverters by AC-DC-AC complete frequency multiplication voltage generator, measurement mechanism is simple in structure, pure sine wave detection power supply output frequency is constant, the frequency conversion source of high stability, guarantee unique validity of test result, improved the order of accuarcy of on-load tap changers of transformers acting characteristic pick-up unit;
When 3, on-load tap changers of transformers acting characteristic pick-up unit utilizes frequency multiplication to detect, each frequency data compares, and device is affected to measurement factor and revise, and having reduced surveying instrument self affects measuring error factor.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is frequency multiplication voltage generator structural representation in the utility model;
Fig. 3 is isolation drive module circuit diagram in the utility model;
Fig. 4 is frequency multiplication power control circuit figure in the utility model;
Fig. 5 is measurement data analysis process figure in the utility model;
Fig. 6 measures main program flow chart in the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
As depicted in figs. 1 and 2, a kind of on-load tap changers of transformers pick-up unit of the present utility model, comprises input power, input power gauge tap 1, center-control and data processor 6, frequency multiplication voltage generator 2 and isolation drive module 5.When tested on-load tap changers of transformers is measured, the utility model device incoming transport 220V single phase poaer supply, by input power gauge tap 1, to device, power, after starting, device sets through self check and device initial parameter the parameters such as frequency that comprise wanted output voltage, trigger center-control and data processor 6 and control 5 driving frequency multiplication voltage generator 2 work of isolation drive module, it is f that center-control and data processor 6 control isolation drive modules 5 drive 2 outputs of frequency multiplication voltage generator to preset frequency
1trial voltage, trial voltage passes through secondary filtering circuit 3, output control switch 4 successively, by bushing shell for transformer and Transformer Winding, be applied to tested load ratio bridging switch 10 two ends, load ratio bridging switch 10 two ends are connected with voltage-current sensor 7, when tested load ratio bridging switch 10 action, voltage-current sensor 7 gathers load ratio bridging switch 10 electric currents, voltage and angle, then sends center-control and data processor 6 to and detects data processing, analysis, storage and uploading detection data file and to computing machine, carry out the work such as detection waveform parsing.Computing machine is connected with data processor 6 with center-control with host computer interface 9 by display interface device 8.
In the utility model, input power is unidirectional 220V alternating voltage, and trial voltage is sinusoidal wave three-phase frequency multiplication voltage.Fig. 2 is the schematic diagram of frequency multiplication voltage generator, frequency multiplication voltage generator is to realize by two inverters of AC-DC-AC, because on-load tap changers of transformers acting characteristic testing requirement detection power supply output frequency is constant, voltage stabilization, pure three-phase sine wave voltage, therefore frequency multiplication voltage generator 2 core components have adopted input filter module, rectification module and three groups of single-phase inversion modules, when input power (ac working power supply) is after input filter module filtered and rectification module rectification, through three groups of single-phase inversion modules, formed three phase AC sine wave voltage, this voltage boosts through output boostering transformer by output filtering module filtered, can output frequency be f
1three phase AC sine wave detect voltage, the frequency that three-phase sine-wave detects voltage is that center-control is controlled by three groups of single-phase inversion modules of control isolation drive module 5 drivings with data processor 6 by controls.
In use, first by center-control and data processor 6 control isolation drive modules 5, drive 2 outputs of frequency multiplication voltage generators to preset frequency is f to the utility model
1sine voltage, utilize voltage-current sensor 7 to gather load ratio bridging switch 10 electric currents, voltage, obtaining an impedance is Z
1; By center-control and data processor 6 control isolation drive modules 5, driving 2 outputs of frequency multiplication voltage generators to preset frequency is f
2sine voltage, f
2for f
1multiple relation, utilize voltage-current sensor 7 to gather load ratio bridging switch 10 electric currents, voltage, obtaining an impedance is Z
2; Because applied sine wave AC signal frequency is that multiple relation (is f
2=2f
1), detecting impedance Z=R+jX, X is the reactance value of detected system, X=ω L=2 π fL, R, for being detected the resistance value (being mainly load ratio bridging switch 10 contact resistances) of system, detects electric voltage frequency difference when inputting when frequency multiplication detects, X reactance is also different, and the reactance testing result under frequency multiplication has: X
2=2X
1, the feature that the resistance value of R does not change with frequency shift, utilizes below formula to measured waveform analytical Calculation, its pure contact resistance value variation characteristic in the time of can obtaining load ratio bridging switch 10 action:
2Z
1-Ζ
2=2×(R+jX
1)-(R+jX
2)=2×(R+jX
1)-(R+j2X
1)=R （a）
Center-control and data processor 6 according to formula (a) by obtain waveform according to not in the same time wave analysis calculate, when then data fitting obtains load ratio bridging switch 10 action, its pure resistance value changes waveform.
Circuit as shown in Figure 3, is the representative instance circuit of realizing isolation module, the variable-frequency power sources isolation drive module 5 that adopts the devices such as opto-coupler chip TLP250 and metal-oxide-semiconductor and resistance to realize.
Circuit as shown in Figure 4, it is the representative instance circuit of realizing three-phase frequency multiplication output voltage control module, comprise SG3525, central control processor, DAC0832, ADC0809 and peripheral voltage, current sensor, display, keyboard, central control processor utilizes ADC0809 to detect three-phase frequency multiplication output voltage, size of current, by computing, then utilize DAC0832 to regulate Ub, Uv changes electric current on transistor collector, reach and control SG3525 output pwm pulse frequency and pulsewidth, driving isolation driver module 5, three-phase frequency multiplication output voltage frequency and amplitude are controlled.
Device of the present utility model in use, can coordinate and call a primary control program and a detection DAP, described primary control program writes in the storer of center-control and data processor 6, and described detection DAP is to carry out on the host computer beyond this device.
As shown in Figure 5, to detecting data, carry out the flow process of specialty analysis, start detection data specialty analysis program, by transferring measurement data file, to data comparative analysis under each frequency, comparative analysis correction affects the factor of device, frequency multiplication is detected to data waveform and carry out Storage & Display.
Start detection data specialty analysis program is carried out frequency multiplication to detected system and is detected data analysis, while 1. utilizing frequency multiplication to detect, each audio data compares, on-load tap changers of transformers 10 acting characteristic pick-up units self are affected to measurement factor and revise, improve measurement accuracy; 2. the feature that impedance has according to input frequency multiplication voltage detecting, according to computing method below, measurement data is carried out to analytical Calculation:
2Z
1-Ζ
2=2×(R+jX
1)-(R+jX
2)=2×(R+jX
1)-(R+j2X
1)=R
Its pure contact resistance value in the time of can obtaining load ratio bridging switch 10 action, on test specimen, obtain waveform according to above-mentioned computing to wave analysis in the same time not, while realizing load ratio bridging switch 10 action by computational data matching, its true pure contact resistance value changes waveform and switch action characteristic, realizes load ratio bridging switch 10 and effectively detects.
As shown in Figure 6, for primary control program process flow diagram, master routine provides the functions such as device startup, self-check of device survey, detected parameters initial setting, output voltage control and the storage of detection data, display measurement waveform, self-check of device before detection, initial parameter setting and demonstration in real time, data storage, simplify testing process, improved detection efficiency and precision.
While starting master routine, first surveying instrument carries out self check, sets initial measurement parameter, if do not triggered, enters initial measurement setting parameter state and wait; If triggered, starter gear times frequency power, output f
1frequency three-phase detection voltage shows f on display
1voltage to frequency waveform, measures and finishes measurement data to store; f
1after frequency measurement, enter and measure judgement state, if do not continue to measure, finish; If continue to measure, start so a times frequency power output f
2voltage to frequency detects, and shows f
2frequency three-phase detection voltage waveform, measures and finishes measurement data to store.
From said process, can find out: device of the present utility model can be eliminated inductance, the impact of capacity effect problem on measurement result, improve the precision of measurement and the uniqueness of measurement result, for the correct assessment apparatus state that detects provides authentic and valid foundation; When next utilizes frequency multiplication to detect, each audio data compares, and device is waited and affects measurement factor and revise, and can reduce the measuring error of surveying instrument self, raising accuracy of detection and antijamming capability.
Below be only preferred implementation of the present utility model; be noted that for those skilled in the art; not departing under the prerequisite of the utility model principle, can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (3)
1. an on-load tap changers of transformers pick-up unit, it is characterized in that: comprise input power, input power gauge tap (1), center-control and data processor (6), frequency multiplication voltage generator (2) and isolation drive module (5), when input power gauge tap (1) conducting, frequency multiplication voltage generator (2) powers on, center-control and data processor (6) are controlled isolation drive module (5) and are driven frequency multiplication voltage generator (2) output to preset the trial voltage of frequency, trial voltage passes through secondary filtering circuit (3) successively, output control switch (4), trial voltage is after filtering applied to tested load ratio bridging switch (10) two ends by bushing shell for transformer and Transformer Winding, load ratio bridging switch (10) is connected with voltage-current sensor (7), when tested load ratio bridging switch (10) moves, voltage-current sensor (7) gathers load ratio bridging switch (10) electric current, voltage, after then processing by center-control and data processor (6), is sent on computing machine and shows.
2. on-load tap changers of transformers pick-up unit according to claim 1, is characterized in that: described trial voltage is sinusoidal wave three-phase frequency multiplication voltage.
3. on-load tap changers of transformers pick-up unit according to claim 2, it is characterized in that: described frequency multiplication voltage generator (2) comprises input filter module, rectification module and three groups of single-phase inversion modules, input power is after input filter module filtered and rectification module rectification, enter three groups of single-phase inversion modules detection voltage is provided, detect voltage and enter output boostering transformer after by output filtering module filtered, output boostering transformer output frequency is the three-phase frequency multiplication output voltage that presets frequency, it is that center-control and data processor (6) drive three groups of single-phase inversion modules to carry out by controlling isolation drive module (5) that three-phase frequency multiplication output voltage frequency is switched with control.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420070693.7U CN203759208U (en) | 2014-02-18 | 2014-02-18 | Transformer on-load tapping switch detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420070693.7U CN203759208U (en) | 2014-02-18 | 2014-02-18 | Transformer on-load tapping switch detection device |
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| Publication Number | Publication Date |
|---|---|
| CN203759208U true CN203759208U (en) | 2014-08-06 |
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|---|---|---|---|
| CN201420070693.7U Withdrawn - After Issue CN203759208U (en) | 2014-02-18 | 2014-02-18 | Transformer on-load tapping switch detection device |
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|---|---|
| CN (1) | CN203759208U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777139A (en) * | 2014-02-18 | 2014-05-07 | 南京卓实电气有限责任公司 | Device and method for detecting transformer on-load tap-changer |
| CN105223496A (en) * | 2015-04-17 | 2016-01-06 | 吉林省电力科学研究院有限公司 | On-load tap changers of transformers naked switch action characteristic alternating-current measurement device |
-
2014
- 2014-02-18 CN CN201420070693.7U patent/CN203759208U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777139A (en) * | 2014-02-18 | 2014-05-07 | 南京卓实电气有限责任公司 | Device and method for detecting transformer on-load tap-changer |
| CN103777139B (en) * | 2014-02-18 | 2016-03-30 | 南京卓实电气有限责任公司 | A kind of on-load tap changers of transformers pick-up unit and detection method |
| CN105223496A (en) * | 2015-04-17 | 2016-01-06 | 吉林省电力科学研究院有限公司 | On-load tap changers of transformers naked switch action characteristic alternating-current measurement device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140806 Effective date of abandoning: 20160330 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |