CN102707173A - Tester - Google Patents
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- CN102707173A CN102707173A CN2012101908005A CN201210190800A CN102707173A CN 102707173 A CN102707173 A CN 102707173A CN 2012101908005 A CN2012101908005 A CN 2012101908005A CN 201210190800 A CN201210190800 A CN 201210190800A CN 102707173 A CN102707173 A CN 102707173A
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Abstract
The invention discloses a tester. The tester comprises a power supply module, a first measuring module, a second measuring module and a master control module. The power supply module is used for providing a test power supply capable of adjusting voltage and frequency continuously. The first measuring module can obtain an output voltage and an output current of the power supply module in real time and performs predetermined volt-ampere characteristics treatment, no-load treatment or load treatment to the output voltage and the output current so as to realize the PT (Predetermined) volt-ampere characteristics, and single phase no-load and single phase load test of a transformer. The second measuring module is used for monitoring the high voltage side voltage of the transformer during an alternating current voltage withstand test of the transformer, and feeds the value to the master control module, so that the master control module adjusts the output of the power supply module according to the high voltage side voltage value and the predetermined withstand voltage value so as to perform the alternating current withstand voltage test of the transformer. Therefore, the tester provided by the invention integrates the test functions such as PT volt-ampere characteristics, single phase no-load and single phase load test of the transformer and alternating current voltage withstand test, thereby improving the test efficiency.
Description
Technical field
The invention belongs to the electric performance test equipment technical field, relate in particular to a kind of tester.
Background technology
When carrying out 10kv controller switching equipment flash test, often relate to test to the electric property of equipment such as voltage transformer (VT), substation transformer and power distribution cabinet.
But at present, all there are problems such as function singleness, measurement wiring are loaded down with trivial details to the required test apparatus of the test of voltage transformer (VT) and substation transformer.Especially in test site; When carrying out Multitest to multinomial electricity function index; As test PT (Phase Voltage Transformes; When the single-phase zero load of volt-ampere characteristic and transformer voltage transformer (VT)), single-phase load, ac voltage withstanding, need every required instrument of test is carried out wiring respectively.And every required instrument kind of test is numerous, thereby makes troubles for the management to instrument, and the wiring complicacy is prone to make mistakes.
To sum up, the function singleness that test apparatus exists in the prior art, measure shortcomings such as wiring is loaded down with trivial details, brought great inconvenience for the controller switching equipment flash test, and lose time, thereby greatly reduce the efficient of test.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of tester, addressing the above problem, realize PT volt-ampere characteristic and the single-phase zero load of transformer, single-phase load, AC voltage withstand test function are integrated in one, thereby improve the purpose of test efficiency.
For this reason, the present invention provides following technical scheme:
A kind of tester is used to carry out PT volt-ampere characteristic and the single-phase zero load of transformer, single-phase load, AC voltage withstand test, the main control module that comprises power module, first measurement module, second measurement module and be used for above-mentioned each module is controlled, wherein:
Said power module is used under the control of said main control module, but the experiment power supply of continuous voltage regulating frequency modulation is provided;
Said first measurement module; Be used under the control of said main control module; Obtain the output voltage and the output current of said power module in real time, according to the output voltage and the output current that are obtained, the volt-ampere characteristic of presetting is handled, the unloaded processing or the load processing;
Said second measurement module; Be used for when carrying out the transformer alternating withstand voltage test; Monitor the high side voltage of said transformer; And the transformer high-voltage side magnitude of voltage of being monitored fed back to said main control module, and then said main control module is regulated the output of power module according to said high side voltage value and preset withstand voltage.
Preferably, said power module comprises variable-frequency power sources and the isolating transformer that links to each other with said variable-frequency power sources, and wherein, said variable-frequency power sources comprises:
The variable-frequency power sources waveform generator is used to produce the sine power supply signal;
The digital am circuit is used under the control of said main control module, and said sine power supply signal is carried out amplitude modulation;
The variable-frequency power sources output circuit is used for carry out width modulation, power drive and output through the sine power supply signal after the amplitude modulation.
Preferably, said variable-frequency power sources output circuit specifically adopts sinusoidal pulse width modulation technology SPWM to carrying out width modulation through the sine power supply signal after the amplitude modulation.
Preferably, said first measurement module comprises parameter acquisition module, volt-ampere characteristic processing module, unloaded processing module and load processing module, wherein:
Said parameter acquisition module is used under the control of said main control module, obtains the output voltage and the output current of said power module in real time;
Said volt-ampere characteristic processing module is used for according to the output voltage and the output current that are obtained, and the volt-ampere characteristic of presetting is handled;
Said unloaded processing module is used for according to the output voltage and the output current that are obtained, and the zero load of presetting is handled;
Said load processing module is used for according to the output voltage and the output current that are obtained, and the load of presetting is handled.
Preferably, said parameter acquisition module comprises voltage transformer (VT), current transformer, first filter amplifier, second filter amplifier and mould/number A/D converter, wherein:
Said voltage transformer (VT) is used under the control of said main control module, gathering the output voltage of said power module in real time;
Said current transformer is used under the control of said main control module, gathering the output current of said power module in real time;
Said first filter amplifier is used for the output voltage of being gathered is carried out filter amplifying processing;
Said second filter amplifier is used for the output current of being gathered is carried out filter amplifying processing;
Said A/D converter is used for output voltage and output current through filter amplifying processing are carried out analog to digital conversion.
Preferably, said second measurement module specifically comprises capacitive divider.
Preferably, said tester also comprises memory module, is used to store the data that said first measurement module and said second measurement module are produced, and wherein: said memory module specifically comprises storer.
Preferably, said tester also comprises with said main control module and linking to each other, and is used to the display module that human-machine operation provides display interface, and wherein: said display module specifically comprises LCD.
Preferably, said tester also comprises with said main control module and linking to each other, and is used to button and key-press module that human-machine operation provides button and button.
Preferably, the control function of said main control module is specifically through chip microcontroller, wherein:
Said single-chip microcomputer is specially 32 automated route management ARM single-chip microcomputers.
Power module in the tester that the embodiment of the invention provides can be under the control of said main control module, but for PT volt-ampere characteristic test, the single-phase zero load of transformer, transformer single-phase load and transformer alternating withstand voltage test the experiment power supply of continuous voltage regulating frequency modulation is provided.And said first measurement module can obtain the output voltage and the output current of said power module in real time; And through the volt-ampere characteristic that said output voltage and output current are preset handle, unloaded handle or load is handled, realize PT volt-ampere characteristic test, the single-phase no-load test of transformer and the test of transformer single-phase load.Second measurement module; Be used for when carrying out the transformer alternating withstand voltage test; Monitor the high side voltage of said transformer; And the transformer high-voltage side magnitude of voltage of being monitored fed back to said main control module, and then said main control module can regulate the output of power module according to said high side voltage value and preset withstand voltage, thus can carry out the transformer alternating withstand voltage test.
It is thus clear that; Tester provided by the invention; Realized PT volt-ampere characteristic and the single-phase zero load of transformer, single-phase load, AC voltage withstand test function are integrated in the purpose of one; Thereby shortcomings such as the function singleness, the measurement wiring that have overcome test apparatus existence in the above-mentioned prior art are loaded down with trivial details, and then improved test efficiency.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a kind of structural representation of the tester that provides of the embodiment of the invention;
Fig. 2 is the structural representation of the variable-frequency power sources waveform generator that provides of the embodiment of the invention;
Fig. 3 is the fundamental diagram of the digital am circuit that provides of the embodiment of the invention;
Fig. 4 is the fundamental diagram of the variable-frequency power sources output circuit that provides of the embodiment of the invention;
Fig. 5 is the fundamental diagram of the parameter acquisition module that provides of the embodiment of the invention;
Fig. 6 is the another kind of structural representation of the tester that provides of the embodiment of the invention;
Fig. 7 is the PT volt-ampere characteristic test circuit diagram that the embodiment of the invention provides;
Fig. 8 is the PT volt-ampere characteristic test process flow diagram that the embodiment of the invention provides;
Fig. 9 is the PT VA characteristic curve that the embodiment of the invention provides;
Figure 10 is the single-phase no-load test circuit diagram of transformer that the embodiment of the invention provides;
Figure 11 is the transformer single-phase load test schematic that the embodiment of the invention provides;
Figure 12 is the transformer alternating withstand voltage test circuit diagram that the embodiment of the invention provides.
Embodiment
For quote and know for the purpose of, the technical term that hereinafter uses, write a Chinese character in simplified form or abridge to sum up and be explained as follows:
The PT volt-ampere characteristic: excitation property also is volt-ampere characteristic usually; The voltage transformer (VT) excitation property is under the situation of all opening a way other terminals of the terminal outlet terminal ground connection of winding of PT; Apply voltage U in Secondary Winding; Measure corresponding exciting current I, the relation between U and the I is exactly the excitation property of voltage transformer (VT).Is that the curve that ordinate is made is exactly the voltage transformer (VT) exciting characteristic curve with U for horizontal ordinate I.
No-load test: the no-load current of measuring transformer and open circuit loss.Can find part or defect in the magnetic circuit; Whether inspection winding inter-turn, layer insulation be good, iron core silicon steel sheet insulating situation and assembly quality etc.
Ac voltage withstanding: the test electrical equipment bears the superpotential ability.
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer; To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiment of the invention is carried out clear, intactly description; Obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Current, to the test of voltage transformer (VT) and substation transformer required test apparatus all have function singleness, measure problems such as wiring is loaded down with trivial details.Based on above-mentioned situation; The inventor is through discovering; All there is the phenomenon of using some same or similar functional part in a lot of pilot projects, thus can the required parts of Multitest project of the same or similar functional part of use be incorporated in the experimental provision, thereby when carrying out above-mentioned Multitest project; The quantity of test apparatus and wiring can be reduced, and then test efficiency can be improved.
For this reason; The embodiment of the invention provides a kind of tester; Be used to carry out PT volt-ampere characteristic and the single-phase zero load of transformer, single-phase load, AC voltage withstand test; See also Fig. 1, the main control module 400 that it comprises power module 100, first measurement module 200, second measurement module 300 and is used for above-mentioned each module is controlled.
Wherein, the control function of main control module 400 can be through the form realization of single-chip microcomputer with master control borad, and in the present embodiment, single-chip microcomputer specifically adopts 32 ARM (automated route management, automated route management) single-chip microcomputer.
Particularly, power module 100 comprises variable-frequency power sources and isolating transformer.
Variable-frequency power sources is a key component of the present invention, its under the control of main control module 400, but the experiment power supply of continuous voltage regulating frequency modulation is provided for PT volt-ampere characteristic test, the single-phase zero load of transformer, single-phase load and transformer alternating withstand voltage test.In the present embodiment, variable-frequency power sources has been used digital waveform synthetic technology and SPWM (Sinusoidal Pulse Width Modulation, sinusoidal pulse width modulation) technology, has realized the FMAM power supply output of 30Hz～300Hz.The output frequency and the amplitude of variable-frequency power sources are controlled through serial line interface by single-chip microcomputer.
Below the inner structure and the principle of work and power of variable-frequency power sources described.
Variable-frequency power sources specifically comprises variable-frequency power sources waveform generator, digital am circuit and variable-frequency power sources output circuit.
The variable-frequency power sources waveform generator is used to produce the sine power supply signal.See also Fig. 2; It shows a kind of structure of above-mentioned variable-frequency power sources waveform generator; Comprise the clock generator 201, counter 202, Wave data ROM (Read-Only Memory, read-only memory) 203 and D/A (digital/analog, the D/A) converter 204 that link to each other successively.Based on above-mentioned device, the principle that this variable-frequency power sources waveform generator produces the sine power supply signal is following: at first, clock generator 201 produces the pulse that is used for actuation counter 202; Afterwards, counter 202 sends to Wave data ROM203 and to be used for address signal that it is scanned under the driving of above-mentioned pulse; Next; When Wave data ROM203 receives above-mentioned address signal, export the data of sinusoidal variations in it input end of D/A converter 204 to, then in D/A converter 204; The data of sine transform are converted into the simulating signal and the output of sinusoidal variations, and this simulating signal is above-mentioned sine power supply signal.
Wherein, can change the frequency that sine wave output is above-mentioned sine power supply signal, in the present embodiment, the frequency adjustment of clock generator 201 specifically passed through the chip microcontroller of the function of realization main control module 400 through the frequency of regulating clock generator 201.
The digital am circuit is used under the control of main control module 400, and above-mentioned sine power supply signal is carried out amplitude modulation.Particularly, this digital am circuit is the modulation circuit that includes D/A converter, sees also Fig. 3, and single-chip microcomputer is specifically realized the amplitude modulation function of digital am circuit offset of sinusoidal power supply signal through the data that D/A converter is set.
The variable-frequency power sources output circuit is used for carry out width modulation, power drive and output through the sine power supply signal after the amplitude modulation.Because PT volt-ampere characteristic of the present invention and the single-phase zero load of transformer, ac voltage withstanding tester need powerful variable-frequency power sources output; See also Fig. 4; Present embodiment adopts SPWM technology and high-power IPM (Intelligent Power Module; SPM) to carrying out width modulation and power drive, last through the sine power supply signal after the amplitude modulation, export by isolating transformer after through the signal after the above-mentioned processing via LPF.
Parameter acquisition module is used under the control of main control module 400, obtains the output voltage and the output current of power module 100 in real time.Referring to Fig. 5; Parameter acquisition module comprises voltage transformer (VT) 501, current transformer 502, first filter amplifier 503 that links to each other with voltage transformer (VT), second filter amplifier 504 that links to each other with current transformer; And A/D (analog/digital, the mould/number) converter 505 that links to each other simultaneously with first filter amplifier 503 and second filter amplifier 504.The concrete principle of work of this parameter acquisition module is: it adopts the real time high-speed synchronous sampling technique under the control of single-chip microcomputer; Respectively output voltage, the output current of power module 100 are carried out signals collecting through voltage transformer (VT) 501, current transformer 502; The output voltage of being gathered afterwards and the signal of output current carry out filter amplifying processing through first filter amplifier 503 and second filter amplifier 504 respectively; Then; Two kinds of signals through after the filter amplifying processing are carried out mould/number conversion by A/D converter 505, obtain the output voltage and the output current of digital form.At last, the storer that the output voltage of digital form and output current are exported under the control of single-chip microcomputer in the following memory module is stored, and follow-up volt-ampere characteristic is handled or unloaded the processing so that carry out.
The volt-ampere characteristic processing module is used for the output voltage and the output current that obtain according to parameter acquisition module, and the volt-ampere characteristic of presetting is handled.
When carrying out the PT volt-ampere characteristic test, the voltage and current at external voltage mutual inductor two ends is the output voltage and the output current of voltage module 100, then can accomplish the PT volt-ampere characteristic test through the research to the volt-ampere characteristic of output voltage and output current.
Wherein, preset volt-ampere characteristic is handled and can be included but not limited to: above-mentioned output voltage and output current are carried out volt-ampere characteristic research and drafting VA characteristic curve, flex point analysis and calculating and some particular points that rules are stipulated compare etc.In the present embodiment, the function of volt-ampere characteristic processing module is specifically accomplished the control of corresponding processing program through single-chip microcomputer automatically.
Need to prove; Volt-ampere characteristic processing module among the present invention specifically realizes its function through the form of software; And those skilled in the art can write corresponding volt-ampere characteristic handling procedure according to the needs of oneself under the inspiration of the embodiment of the invention, like curve plotting program, flex point routine analyzer etc.; Need not performing creative labour, so locate no longer the concrete software implementing course of volt-ampere characteristic processing module is detailed.
Unloaded processing module is used for the output voltage and the output current that obtain according to parameter acquisition module, and the zero load of presetting is handled.
When carrying out the single-phase no-load test of transformer; Usually the hot side of transformer is opened a way; Step-down side adds rated voltage, so measure on the step-down side under the rated voltage electric current, above-mentioned rated voltage and current corresponding thereof are the no-load voltage and the no-load current of transformer.And the no-load voltage of transformer and no-load current are similarly the output voltage and the output current of power module 100, so can realize the research to the no-load characteristic of transformer through the research to output voltage and output current.
Wherein, Preset zero load is handled and is included but not limited to: at first; Draw the open circuit loss of transformer according to electricity formula P=UI (known), afterwards, whether meet the specification and the requirement of standard according to designing and calculating, the technology manufacturing of no-load current and open circuit loss checking transformer core; Whether the inspection transformer core exists defective, and like local overheating, minor insulation is bad etc.
Correspondingly, the function of unloaded processing module of the present invention realizes through form of software equally, no longer details here.
The load processing module is used for according to the output voltage and the output current that are obtained, and the load of presetting is handled.
For the ease of measuring, usually the high pressure winding is connected the direct short-circuit of low pressure winding with power supply during the test of transformer single-phase load.When making an experiment, make the high pressure winding electric current reach or near rated current, and then measure the voltage of transformer under the rated current.Above-mentioned rated current and corresponding voltage thereof are the load current and the load voltage of transformer.Correspondingly, in the present embodiment, the load current of transformer and load voltage are respectively the output current and the output voltage of power module 100, so can realize the transformer load The Characteristic Study through the research to output current and output voltage equally.
Above-mentioned preset load processing comprises but is not limited to: the load loss and the loaded impedance that draw transformer respectively according to electricity formula P=UI and R=U/I.Afterwards; Draw the copper loss of transformer according to the load loss of transformer, and calculate and confirm that transformer has or not the efficient of thermally-stabilised and the moving stable and calculating transformer maybe be with other transformers connected in parallel operation, calculating and testing transformer short circuit time the etc. according to load loss, load voltage and loaded impedance.
Equally, the function of load processing module also realizes through form of software, no longer details.
Wherein, second measurement module 300 comprises capacitive divider, and above-mentioned capacitive divider is specially the high impedance standard capacitor divider.
It is thus clear that; Tester provided by the invention; Realized the test function of PT volt-ampere characteristic and the single-phase zero load of transformer, single-phase load, ac voltage withstanding is integrated in the purpose of one; Thereby shortcomings such as the function singleness, the measurement wiring that have overcome test apparatus existence in the above-mentioned prior art are loaded down with trivial details, and then improved test efficiency.
In other embodiment of the present invention, referring to Fig. 6, above-mentioned tester also comprises memory module 601, and this memory module 601 is used to store the data that first measurement module 200 and second measurement module 300 are produced.Above-mentioned memory module 601 specifically comprises storer.
The memory module 601 of this embodiment is for the invention provides data storage function, to satisfy the present invention in that data are carried out in the processing procedure, to the demand of data buffer memory or backup.
In other embodiment of the present invention, still see also Fig. 6, above-mentioned tester also comprises button and key-press module 602, button links to each other with main control module 400 with key-press module 602, is used to human-machine operation button and button are provided.It can comprise function button and button and button is set and button.Like " startup ", " affirmation ", " withdrawing from ", " boosting " and buttons such as " step-downs ".When the user operates a certain button or button; Promptly be equivalent to the user and tester of the present invention assigned a steering order through this button or button; And then the single-chip microcomputer that links to each other with this button or button receives this steering order, and according to the content of steering order corresponding parts controlled.
In other embodiment of the present invention, still see also Fig. 6, above-mentioned tester also comprises display module 603, display module 603 links to each other with main control module 400, is used to human-machine operation display interface is provided.Wherein, display module 603 specifically can be LCD.From the angle of the internal operation of tester of the present invention, when carrying out a certain test, display module 603 is under the control of single-chip microcomputer; Receive the idsplay order of single-chip microcomputer; And on its interface that provides, carry out corresponding content of the test according to the content of idsplay order and show, as when starting a certain test, to this test test the demonstration of menu item accordingly, to the demonstration of experimental result etc.; To make things convenient for the user that test is advanced newly more to get information about,, the user the invention provides facility for using.
In other embodiment of the present invention, still see also Fig. 6, above-mentioned tester also comprises interface module 604.Interface module 604 comprises:
On-line interface is used for online;
Printer interface is used to connect printer.
Below the process of the test of utilizing the present invention to carry out PT volt-ampere characteristic test, the single-phase zero load of transformer, single-phase load test and transformer alternating withstand voltage test respectively is described in detail.
(1) PT volt-ampere characteristic test
Referring to Fig. 7, the present invention is carried out wiring with voltage transformer (VT) by annexation shown in the figure.Wherein, as shown in the figure, voltage is applied on the secondary terminal.In the present embodiment; The experiment power supply frequency is 50Hz; In when operation, the user is that 50Hz gets final product through button and key-press module and display module with the frequency setting of variable-frequency power sources specifically, and in tester of the present invention inside; Single-chip microcomputer is through the instruction control clock generator of the key-press module that receives, and then the frequency of clock generator control of conversion power supply is 50Hz.
Measurement point comprises 20%, 50%, 80%, 100%, 120%, 190% of rated voltage at least, and corresponding to the magnitude of voltage under the above-mentioned rated voltage factor, measuring corresponding exciting current and drawing out exciting characteristic curve is VA characteristic curve.Magnitude of voltage under the above-mentioned rated voltage factor specifically is provided with through function button by the user in advance; And magnitude of voltage under the above-mentioned rated voltage factor and exciting current thereof are the output voltage and the output current of above-mentioned variable-frequency power sources, measure and store its value by tester of the present invention.
Referring to Fig. 8, the detailed step that utilizes the present invention to carry out the PT volt-ampere characteristic is:
S1: start variable-frequency power sources.
S2: the state that reads variable-frequency power sources.
S3: whether the state of judging the variable-frequency power sources that is read is normal, if undesired, go to step S4, otherwise goes to S5.
S4: report an error, powered-down, and go to S1.
S5: the stepping and the pressurization of calculating the test point voltage of setting.
S6: the output voltage of read test point, output current and storage.
S7: judge whether over-voltage and over-current, if go to S4, otherwise go to S8.
S8: judge whether to arrive the test point of ceiling voltage, if not, go to S2, otherwise continue.
S9: the output of closing variable-frequency power sources.
S10: draw VA characteristic curve.
S11: print or storage.
Referring to Fig. 9, it is the PT VA characteristic curve that utilizes the present invention to draw.
(2) the single-phase no-load test of transformer
In the present embodiment, during no-load test, by power supply is boosted under the rated voltage, measuring, calculate open circuit loss and preserve, is that A, B, C three-phase after measuring and finishing add up each phase open circuit loss at three-phase, calculates total open circuit loss.In said process, each phase open circuit loss can show comparison.
Referring to Figure 10, it shows the line connecting relation of transformer and tester of the present invention, and it is specially A addition crimping line chart.During concrete test, at first set test parameters, as the rated voltage of test point etc., begin the single-phase no-load test of transformer afterwards when moving like no-load transformer.Tester according to the test parameters of setting, boosts to rated voltage with power supply automatically, measures and write down no-load voltage, the no-load current of transformer, according to the open circuit loss of above-mentioned no-load voltage and no-load current calculating transformer.
The measuring process of B phase, C phase is basic identical with above-mentioned A process mutually, afterwards, can verify whether designing and calculating, the technology manufacturing of transformer core meet the specification and the requirement of standard according to each phase no-load current, open circuit loss; Whether the inspection transformer core exists defective, and like local overheating, minor insulation is bad etc.
Whole process is carried out over-voltage and over-current, power supply status and keyboard interrupt and is judged; For example; In test process, if discharge or overcurrent condition, tester can cut off variable-frequency power sources automatically and show " test product discharge " or " overcurrent protection "; Like accident, the user can press " suddenly stopping " button and promptly stop test and cut off experiment power supply in the process of the test.
(3) transformer single-phase load test
In the present embodiment, during load test, by power supply is boosted under the rated current, measurement, computational load loss are also preserved.After three-phase is measured end, each item load loss is added up, calculate the total load loss.And in said process, each phase load loss can show comparison, and same whole process is carried out over-voltage and over-current, power supply status and keyboard interrupt and judged.
In this transformer single-phase load test, the line connecting relation of transformer and tester of the present invention sees also Figure 11, and likewise, it is specially A addition crimping line chart.Corresponding with above-mentioned no-load test; Rated current when this test at first need be set the transformer load operation, afterwards, tester is automatically according to this parameter of rated current of setting; Regulate the electric current of transformer; After it reaches rated current, measure and write down this electric current with and corresponding voltage, the i.e. load current of transformer and load voltage.And according to the load loss and the loaded impedance of load current and load voltage calculating transformer.
Change the wiring of corresponding phase; Repeat said process and can measure and calculate the load loss of B phase, C phase, loaded impedance etc.; Can study accordingly according to load loss, load voltage and the loaded impedance of three-phase afterwards; Address before the corresponding research of wherein carrying out according to load data, no longer set forth here.
(4) transformer alternating withstand voltage test
Referring to Figure 12, in the transformer alternating withstand voltage test, the circuit of testing transformer and tester of the present invention connects shown in figure 12.This experiment test transformer bears superpotential ability, at first sets a withstand voltage by the user, carries out pressure regulation according to the withstand voltage of setting afterwards, and monitors the state of transformer in the pressure regulation process, thereby realizes transformer is born the test of superpotential ability.
During concrete the test, can select manual or automatic two kinds of patterns.During manual mode, regulation voltage and frequency and button are arranged on the tester.At first set a withstand voltage and with the frequency adjustment of variable-frequency power sources to 50Hz or needed frequency; Regulate the output voltage of variable-frequency power sources then, at this moment, show in real time the output voltage and the output current of current variable-frequency power sources on the LCD, and the high side voltage of the testing transformer that measures by standard capacitor divider; Afterwards, the user regulates the output voltage of variable-frequency power sources, and judges whether it reaches the withstand voltage of setting according to the high side voltage of predefined withstand voltage and testing transformer, and the state of monitoring test transformer in the pressure regulation process.
During automatic mode, corresponding, need preestablish a withstand voltage, tester can be regulated the output voltage of variable-frequency power sources according to the withstand voltage of user's setting automatically slowly afterwards, makes the high side voltage of testing transformer reach the withstand voltage of setting.This process need not manually-operated by the control of monolithic and internal processing program thereof, and in case there is situation such as overcurrent-overvoltage puncture to take place, tester can cut out variable-frequency power sources output immediately, and makes prompting, warning.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (10)
1. tester; Be used to carry out voltage transformer pt volt-ampere characteristic and the single-phase zero load of transformer, single-phase load, AC voltage withstand test; It is characterized in that, the main control module that comprises power module, first measurement module, second measurement module and be used for above-mentioned each module is controlled, wherein:
Said power module is used under the control of said main control module, but the experiment power supply of continuous voltage regulating frequency modulation is provided;
Said first measurement module; Be used under the control of said main control module; Obtain the output voltage and the output current of said power module in real time, and according to the output voltage and the output current that are obtained, the volt-ampere characteristic of presetting is handled, the unloaded processing or the load processing;
Said second measurement module; Be used for when carrying out the transformer alternating withstand voltage test; Monitor the high side voltage of said transformer; And the transformer high-voltage side magnitude of voltage of being monitored fed back to said main control module, and then said main control module is regulated the output of power module according to said high side voltage value and preset withstand voltage.
2. tester according to claim 1 is characterized in that, said power module comprises variable-frequency power sources and the isolating transformer that links to each other with said variable-frequency power sources, and wherein, said variable-frequency power sources comprises:
The variable-frequency power sources waveform generator is used to produce the sine power supply signal;
The digital am circuit is used under the control of said main control module, and said sine power supply signal is carried out amplitude modulation;
The variable-frequency power sources output circuit is used for carry out width modulation, power drive and output through the sine power supply signal after the amplitude modulation.
3. tester according to claim 2 is characterized in that, said variable-frequency power sources output circuit specifically adopts sinusoidal pulse width modulation technology SPWM to carrying out width modulation through the sine power supply signal after the amplitude modulation.
4. tester according to claim 1 is characterized in that, said first measurement module comprises parameter acquisition module, volt-ampere characteristic processing module, unloaded processing module and load processing module, wherein:
Said parameter acquisition module is used under the control of said main control module, obtains the output voltage and the output current of said power module in real time;
Said volt-ampere characteristic processing module is used for according to the output voltage and the output current that are obtained, and the volt-ampere characteristic of presetting is handled;
Said unloaded processing module is used for according to the output voltage and the output current that are obtained, and the zero load of presetting is handled;
Said load processing module is used for according to the output voltage and the output current that are obtained, and the load of presetting is handled.
5. tester according to claim 4 is characterized in that, said parameter acquisition module comprises voltage transformer (VT), current transformer, first filter amplifier, second filter amplifier and mould/number A/D converter, wherein:
Said voltage transformer (VT) is used under the control of said main control module, gathering the output voltage of said power module in real time;
Said current transformer is used under the control of said main control module, gathering the output current of said power module in real time;
Said first filter amplifier is used for the output voltage of being gathered is carried out filter amplifying processing;
Said second filter amplifier is used for the output current of being gathered is carried out filter amplifying processing;
Said A/D converter is used for output voltage and output current through filter amplifying processing are carried out analog to digital conversion.
6. tester according to claim 1 is characterized in that, said second measurement module specifically comprises capacitive divider.
7. tester according to claim 1 is characterized in that also comprising memory module, is used to store the data that said first measurement module and said second measurement module are produced, and wherein: said memory module specifically comprises storer.
8. tester according to claim 1 is characterized in that also comprising with said main control module linking to each other that be used to the display module that human-machine operation provides display interface, wherein: said display module specifically comprises LCD.
9. tester according to claim 1 is characterized in that also comprising with said main control module linking to each other, and is used to button and key-press module that human-machine operation provides button and button.
10. according to each described tester of claim 1 ~ 9, it is characterized in that the control function of said main control module is specifically through chip microcontroller, wherein:
Said single-chip microcomputer is specially 32 automated route management ARM single-chip microcomputers.
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| CN2012101908005A CN102707173A (en) | 2012-06-11 | 2012-06-11 | Tester |
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| CN2012101908005A CN102707173A (en) | 2012-06-11 | 2012-06-11 | Tester |
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| CN103645393A (en) * | 2013-11-04 | 2014-03-19 | 株洲南车时代电气股份有限公司 | Converter automatic test system and method |
| CN103744031A (en) * | 2013-12-13 | 2014-04-23 | 珠海瑞捷电气有限公司 | Power supply detection apparatus |
| CN103901332A (en) * | 2014-04-23 | 2014-07-02 | 国网上海市电力公司 | Three-phase frequency doubling sensing voltage-withstand test device |
| CN105572518A (en) * | 2016-02-26 | 2016-05-11 | 国网山东省电力公司蓬莱市供电公司 | Power detection device and method thereof |
| CN107015037A (en) * | 2017-05-27 | 2017-08-04 | 国网上海市电力公司 | A kind of program control test power device and application process |
| CN107024631A (en) * | 2017-05-27 | 2017-08-08 | 国网上海市电力公司 | With the volt-ampere characteristic test method of Multifunctional coil kind equipment testing synthesis parameter device |
| CN107064694A (en) * | 2017-05-27 | 2017-08-18 | 国网上海市电力公司 | No-load test method based on Multifunctional coil kind equipment testing synthesis parameter device |
| CN107167710A (en) * | 2017-05-27 | 2017-09-15 | 国网上海市电力公司 | Pressure test method based on Multifunctional coil kind equipment testing synthesis parameter device |
| CN107167683A (en) * | 2017-05-27 | 2017-09-15 | 国网上海市电力公司 | Load test method based on Multifunctional coil kind equipment testing synthesis parameter device |
| CN107422201A (en) * | 2017-05-27 | 2017-12-01 | 国网上海市电力公司 | A kind of Multifunctional coil kind equipment testing synthesis parameter device |
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| CN108196130A (en) * | 2018-03-08 | 2018-06-22 | 云南电网有限责任公司电力科学研究院 | The dielectric loss test method and device of comparison current signal are acquired using resitstance voltage divider |
| CN108508394A (en) * | 2017-02-26 | 2018-09-07 | 武汉市欧睿科技有限公司 | The C-V characteristic detection method of mutual inductor |
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| CN110716482A (en) * | 2019-11-18 | 2020-01-21 | 国网上海市电力公司 | Distribution transformer man-machine interaction system and use method thereof |
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| CN103645393B (en) * | 2013-11-04 | 2017-04-12 | 株洲南车时代电气股份有限公司 | Converter automatic test system and method |
| CN103744031A (en) * | 2013-12-13 | 2014-04-23 | 珠海瑞捷电气有限公司 | Power supply detection apparatus |
| CN103744031B (en) * | 2013-12-13 | 2017-01-11 | 珠海瑞捷电气股份有限公司 | Power supply detection apparatus |
| CN103901332A (en) * | 2014-04-23 | 2014-07-02 | 国网上海市电力公司 | Three-phase frequency doubling sensing voltage-withstand test device |
| CN105572518A (en) * | 2016-02-26 | 2016-05-11 | 国网山东省电力公司蓬莱市供电公司 | Power detection device and method thereof |
| CN108508394A (en) * | 2017-02-26 | 2018-09-07 | 武汉市欧睿科技有限公司 | The C-V characteristic detection method of mutual inductor |
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| CN107024631A (en) * | 2017-05-27 | 2017-08-08 | 国网上海市电力公司 | With the volt-ampere characteristic test method of Multifunctional coil kind equipment testing synthesis parameter device |
| CN107167710A (en) * | 2017-05-27 | 2017-09-15 | 国网上海市电力公司 | Pressure test method based on Multifunctional coil kind equipment testing synthesis parameter device |
| CN107167683A (en) * | 2017-05-27 | 2017-09-15 | 国网上海市电力公司 | Load test method based on Multifunctional coil kind equipment testing synthesis parameter device |
| CN107422201A (en) * | 2017-05-27 | 2017-12-01 | 国网上海市电力公司 | A kind of Multifunctional coil kind equipment testing synthesis parameter device |
| CN107015037A (en) * | 2017-05-27 | 2017-08-04 | 国网上海市电力公司 | A kind of program control test power device and application process |
| CN108051670A (en) * | 2017-12-05 | 2018-05-18 | 深圳国创名厨商用设备制造有限公司南海分公司 | A kind of transformer testing frock |
| CN108196130A (en) * | 2018-03-08 | 2018-06-22 | 云南电网有限责任公司电力科学研究院 | The dielectric loss test method and device of comparison current signal are acquired using resitstance voltage divider |
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| CN110716482A (en) * | 2019-11-18 | 2020-01-21 | 国网上海市电力公司 | Distribution transformer man-machine interaction system and use method thereof |
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