CN203825100U - Transformer transformation ratio tester - Google Patents
Transformer transformation ratio tester Download PDFInfo
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- CN203825100U CN203825100U CN201420125377.5U CN201420125377U CN203825100U CN 203825100 U CN203825100 U CN 203825100U CN 201420125377 U CN201420125377 U CN 201420125377U CN 203825100 U CN203825100 U CN 203825100U
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- operational amplifier
- resistance
- transformer
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- effect transistor
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- 230000009466 transformation Effects 0.000 title abstract description 5
- 230000003750 conditioning effect Effects 0.000 claims abstract description 18
- 230000002093 peripheral effect Effects 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 238000007639 printing Methods 0.000 claims abstract description 4
- 230000005669 field effect Effects 0.000 claims description 24
- 239000003990 capacitor Substances 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical class [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 230000036541 health Effects 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 2
- 230000001143 conditioned effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model discloses a transformer transformation ratio tester. The transformer transformation ratio tester comprises a three-phase digital frequency conversion power source used for converting an alternating current power source into a three-phase power source, a relay used for controlling the output of the three-phase digital frequency conversion power source, a signal conditioning circuit used for respectively conditioning primary and secondary voltage signals of a transformer to be tested and transmitting conditioned voltage signals to a main control CPU, and peripheral interface and equipment which includes a USB interface, an RS232 interface, a display, an input device and a printer and is used for realizing input, transmission, display and printing operation of data; and an A/D conversion module is integrated in the main control CPU and is used for converting analog signals into digital signals which can be identified by the main control CPU. With the transformer transformation ratio tester of the utility model adopted, performance can be improved, while cost can be reduced; fault rate can be reduced, and losses brought by frequent maintenance and repair can be avoided; and measuring accuracy and testing speed can be improved.
Description
Technical field
The utility model relates to a kind of transformer voltage ratio tester.
Background technology
The test of existing transformer voltage ratio tester is often more single, in that group test, no-load voltage ratio test separate often and test result, often only comprises voltage ratio data.Voltage ratio is measured conventional two kinds of methods: two voltmeter methods and no-load voltage ratio bridge method.All use single phase poaer supply no matter use in two voltmeter methods or the experiment of no-load voltage ratio bridge measurement, this is that the voltage of the winding in this iron core column and the number of turn are proportional because of with single phase poaer supply, an iron core column being applied to voltage.While using three-phase supply, because three-phase voltage may be asymmetric, the relation of phase voltage and line voltage may be not equal to √ 3.Because the deviation that voltage ratio allows is very little, therefore may draw incorrect result.
Along with the long-term use of current no-load voltage ratio tester device, experimenter constantly finds new problem, new requirement is constantly proposed, at present in the urgent need to provide the turn ratio in measuring voltage ratio (line voltage), phase voltage ratio, the actual measurement voltage ratio of single phase power supply, concrete angle value when phase place meter method for measuring group, when measurement once with the intermediate results such as secondary line voltage, and some other data that cannot measure, to facilitate experimenter to analyze the parameter of transformer various aspects.
Utility model content
The purpose of this utility model is exactly in order to address the above problem, a kind of transformer voltage ratio tester has been proposed, this device can by user as required the principle of which kind of measuring method of choice for use measure, and tester inside has the three-phase inversion digital power of three-phase voltage symmetry, measurement result is accurate, measures efficiency high.
To achieve these goals, the utility model adopts following technical scheme:
A kind of transformer voltage ratio tester, three-phase digital variable-frequency power sources, relay, master cpu, signal conditioning circuit and peripheral interface and equipment;
Three-phase digital variable-frequency power sources: for AC power is transformed into three-phase supply;
Relay: for controlling the output of three-phase digital variable-frequency power sources;
Signal conditioning circuit: for transformer primary and secondary voltage signal to be measured is nursed one's health respectively, and deliver to master cpu;
Peripheral interface and equipment: comprise USB interface, RS232 interface, display, input equipment and printer, for realizing input, transmission, demonstration and the printing of data;
The inner integrated A/D modular converter of described master cpu, for changing into simulating signal the digital signal that master cpu can be identified;
Three-phase digital variable-frequency power sources is connected with relay, and relay is connected with master cpu through signal conditioning circuit, master cpu also with peripheral interface and equipment connection, relay is connected with transformer to be measured.
Described master cpu comprises ARM Cortex
tM-M4 kernel CPU and 16 8 passage A/D conversion chip A/D7606, described CPU model is STM32F407.
Described three-phase digital variable-frequency power sources comprises:
The drain electrode of field effect transistor Q1 is connected on bus, source electrode is connected with the drain electrode of field effect transistor Q2, and the grid of field effect transistor Q1 connects EPWM1A; The grid of field effect transistor Q2 connects EPWM1B, source ground;
The drain electrode of field effect transistor Q3 is connected on bus, source electrode is connected with the drain electrode of field effect transistor Q4, and the grid of field effect transistor Q3 connects EPWM2A; The grid of field effect transistor Q4 connects EPWM2B, source ground;
The drain electrode of field effect transistor Q5 is connected on bus, source electrode is connected with the drain electrode of field effect transistor Q6, and the grid of field effect transistor Q5 connects EPWM3A; The grid of field effect transistor Q6 connects EPWM3B, source ground;
Described signal conditioning circuit comprises:
Transformer signal negative input is surveyed in the reception after resistance R 1, resistance R 9 series connection of the reverse input end of operational amplifier U1, transformer signal electrode input end is surveyed in the reception after resistance R 3, resistance R 10 series connection of the positive input of operational amplifier U1, and resistance R 2 is serially connected between the output terminal and reverse input end of operational amplifier U1;
Transformer signal electrode input end is surveyed in the reception after resistance R 5, resistance R 10 series connection of the reverse input end of operational amplifier U2, transformer signal negative pole utmost point input end is surveyed in the reception after resistance R 7, resistance R 9 series connection of the positive input of operational amplifier U2, and resistance R 6 is serially connected between the output terminal and reverse input end of operational amplifier U2;
Positive input, the other end ground connection of resistance R 4 one termination operational amplifier U1; Positive input, the other end ground connection of resistance R 8 one termination operational amplifier U2;
The output terminal of operational amplifier U1 and operational amplifier U2 accesses respectively No. 3 pins and No. 2 pins of operational amplifier U3, No. 4 pins of operational amplifier U3 and No. 8 connect respectively-15V of pin and+15V power supply, No. 5 of operational amplifier U3, No. 6 pin ground connection, operational amplifier U3 connects controller, the output termination A/D modular converter of operational amplifier U3;
One end of capacitor C 1 and capacitor C 2 connects respectively No. 8 pins, the other end ground connection of operational amplifier U3;
One end of capacitor C 3 and capacitor C 4 connects respectively No. 4 pins, the other end ground connection of operational amplifier U3.
The model of described operational amplifier U3 is A/D8253.
The beneficial effects of the utility model are:
1. the utility model uses the dual core processor chip of Highgrade integration to replace original 51 series monolithics and numerous and diverse numerous peripherals thereof.When having improved performance, reduce on the contrary cost, also reduced the probability that fault produces simultaneously, the loss of having avoided frequent maintenance to bring.
2. the utility model adopts three-phase digital variable-frequency power sources, therefore there is no the massive original paper of the such volume of transformer, makes the volume and weight of overall instrument have obvious improvement; And output voltage can regulate (10V-160V) as required, use more flexible.
3. two of signal conditioning circuit of the present utility model differential amplifiers are configured to provide the connection of a differential output, therefore can ensure that be exist and process with the form of difference mode signal before signal enters A/D sampling always, therefore there is better antijamming capability, for requiring high performance application to realize accurate signal condition, outstanding common-mode rejection ratio and high bandwidth can be provided, outstanding gain accuracy can be provided, and there is good temperature characterisitic.The integrality of signal when these features can ensure signal attenuation at the corresponding levels and rear class programmable gain amplifier amplifying signal, thus higher measuring accuracy is provided.
4. the utility model is abandoned the method for former employing relay switch resistance change gain, change into and adopt A/D8253 to carry out signal amplification, reduce distorted signals and the gain error brought because of resistance error, and needed wait time (need when relay switch waiting signal stable) hardly, therefore can also improve the speed of test.
Brief description of the drawings
Fig. 1 is the utility model one-piece construction block diagram;
Fig. 2 is the utility model three-phase digital variable-frequency power sources circuit diagram;
Fig. 3 is the utility model signal conditioning circuit figure.
Wherein, 1. transformer to be measured, 2. signal conditioning circuit, 3. three-phase digital variable-frequency power sources, 4. master cpu, 6. display, 7. input equipment, 8.USB interface, 9.RS232 interface, 10. printer, 11. relays.
Embodiment:
Below in conjunction with accompanying drawing and embodiment, the utility model is described further:
As shown in Figure 1, a kind of transformer voltage ratio tester, comprising: three-phase digital variable-frequency power sources 3, relay 11, master cpu 4, A/D modular converter, signal conditioning circuit 2 and peripheral interface and equipment;
Three-phase digital variable-frequency power sources 3: for AC power is transformed into three-phase supply;
Relay 11: for controlling the output of three-phase digital variable-frequency power sources;
Signal conditioning circuit 2: for transformer primary and secondary voltage signal to be measured is nursed one's health respectively, and deliver to the AD conversion chip AD7606 of master cpu;
Peripheral interface and equipment: comprise USB interface 8, RS232 interface 9, display 6, input equipment 7 and printer 10, for realizing input, transmission, demonstration and the printing of data;
The inner integrated A/D modular converter of master cpu 4, for changing into simulating signal the digital signal that master cpu 4 can be identified;
Three-phase digital variable-frequency power sources 3 is connected with relay 11, and relay is connected with master cpu 4 through signal conditioning circuit 2, master cpu 4 also with peripheral interface and equipment connection, relay 11 is connected with transformer 1 to be measured.
Relay 11 control sections are added to the output of three-phase digital variable-frequency power sources 3 on transformer 1 to be measured on demand, for the situation short circuit transformer respective terminal that needs short circuit, signal conditioning circuit 2 is nursed one's health the voltage signal of transformer 1 primary and secondary to be measured respectively, and delivers to A/D modular converter.
As shown in Figure 2, this three-phase digital variable-frequency power sources 3 adopts SPWM inversion transformation technique, directly 220V AC power is transformed into three-phase supply, and three-phase supply in three-phase no-load voltage ratio tester in the past be then all the low voltage three-phase power supply that adopts the mode of power amplification to generate 10V left and right boost and obtain high pressure through transformer.
As shown in Figure 3, signal conditioning circuit 2 comprises:
Transformer signal negative input is surveyed in the reception after resistance R 1, resistance R 9 series connection of the reverse input end of operational amplifier U1, transformer signal electrode input end is surveyed in the reception after resistance R 3, resistance R 10 series connection of the positive input of operational amplifier U1, and resistance R 2 is serially connected between the output terminal and reverse input end of operational amplifier U1;
Transformer signal electrode input end is surveyed in the reception after resistance R 5, resistance R 10 series connection of the reverse input end of operational amplifier U2, transformer signal negative pole utmost point input end is surveyed in the reception after resistance R 7, resistance R 9 series connection of the positive input of operational amplifier U2, and resistance R 6 is serially connected between the output terminal and reverse input end of operational amplifier U2;
Positive input, the other end ground connection of resistance R 4 one termination operational amplifier U1; Positive input, the other end ground connection of resistance R 8 one termination operational amplifier U2;
The output terminal of operational amplifier U1 and operational amplifier U2 accesses respectively No. 3 pins and No. 2 pins of operational amplifier U3, No. 4 pins of operational amplifier U3 and No. 8 connect respectively-15V of pin and+15V power supply, No. 5 of operational amplifier U3, No. 6 pin ground connection, operational amplifier U3 connects controller, the output termination A/D modular converter of operational amplifier U3;
One end of capacitor C 1 and capacitor C 2 connects respectively No. 8 pins, the other end ground connection of operational amplifier U3;
One end of capacitor C 3 and capacitor C 4 connects respectively No. 4 pins, the other end ground connection of operational amplifier U3.
The model of described operational amplifier U3 is A/D8253.
By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the not restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendments that creative work can make or distortion still in protection domain of the present utility model.
Claims (5)
1. a transformer voltage ratio tester, is characterized in that, comprising: three-phase digital variable-frequency power sources, relay, master cpu, signal conditioning circuit and peripheral interface and equipment;
Three-phase digital variable-frequency power sources: for AC power is transformed into three-phase supply;
Relay: for controlling the output of three-phase digital variable-frequency power sources;
Signal conditioning circuit: for transformer primary and secondary voltage signal to be measured is nursed one's health respectively, and deliver to master cpu;
Peripheral interface and equipment: comprise USB interface, RS232 interface, display, input equipment and printer, for realizing input, transmission, demonstration and the printing of data;
The inner integrated A/D modular converter of described master cpu, for changing into simulating signal the digital signal that master cpu can be identified;
Three-phase digital variable-frequency power sources is connected with relay, and relay is connected with master cpu through signal conditioning circuit, master cpu also with peripheral interface and equipment connection, relay is connected with transformer to be measured.
2. a kind of transformer voltage ratio tester as claimed in claim 1, is characterized in that, described master cpu comprises ARMCortex
tM-M4 kernel CPU and 16 8 passage A/D conversion chip A/D7606, described CPU model is STM32F407.
3. a kind of transformer voltage ratio tester as claimed in claim 1, is characterized in that, described three-phase digital variable-frequency power sources comprises:
The drain electrode of field effect transistor Q1 is connected on bus, source electrode is connected with the drain electrode of field effect transistor Q2, and the grid of field effect transistor Q1 connects SPWM modulation signal EPWM1A; The grid of field effect transistor Q2 connects SPWM modulation signal EPWM1B, source ground;
The drain electrode of field effect transistor Q3 is connected on bus, source electrode is connected with the drain electrode of field effect transistor Q4, and the grid of field effect transistor Q3 connects SPWM modulation signal EPWM2A; The grid of field effect transistor Q4 connects SPWM modulation signal EPWM2B, source ground;
The drain electrode of field effect transistor Q5 is connected on bus, source electrode is connected with the drain electrode of field effect transistor Q6, and the grid of field effect transistor Q5 connects SPWM modulation signal EPWM3A; The grid of field effect transistor Q6 connects SPWM modulation signal EPWM3B, source ground.
4. a kind of transformer voltage ratio tester as claimed in claim 1, is characterized in that, described signal conditioning circuit comprises:
Transformer signal negative input is surveyed in the reception after resistance R 1, resistance R 9 series connection of the reverse input end of operational amplifier U1, transformer signal electrode input end is surveyed in the reception after resistance R 3, resistance R 10 series connection of the positive input of operational amplifier U1, and resistance R 2 is serially connected between the output terminal and reverse input end of operational amplifier U1;
Transformer signal electrode input end is surveyed in the reception after resistance R 5, resistance R 10 series connection of the reverse input end of operational amplifier U2, transformer signal negative pole utmost point input end is surveyed in the reception after resistance R 7, resistance R 9 series connection of the positive input of operational amplifier U2, and resistance R 6 is serially connected between the output terminal and reverse input end of operational amplifier U2;
Positive input, the other end ground connection of resistance R 4 one termination operational amplifier U1; Positive input, the other end ground connection of resistance R 8 one termination operational amplifier U2;
The output terminal of operational amplifier U1 and operational amplifier U2 accesses respectively No. 3 pins and No. 2 pins of operational amplifier U3, No. 4 pins of operational amplifier U3 and No. 8 connect respectively-15V of pin and+15V power supply, No. 5 of operational amplifier U3, No. 6 pin ground connection, operational amplifier U3 connects controller, the output termination A/D modular converter of operational amplifier U3;
One end of capacitor C 1 and capacitor C 2 connects respectively No. 8 pins, the other end ground connection of operational amplifier U3;
One end of capacitor C 3 and capacitor C 4 connects respectively No. 4 pins, the other end ground connection of operational amplifier U3.
5. a kind of transformer voltage ratio tester as claimed in claim 4, is characterized in that, the model of described operational amplifier U3 is A/D8253.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420125377.5U CN203825100U (en) | 2014-03-19 | 2014-03-19 | Transformer transformation ratio tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420125377.5U CN203825100U (en) | 2014-03-19 | 2014-03-19 | Transformer transformation ratio tester |
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| Publication Number | Publication Date |
|---|---|
| CN203825100U true CN203825100U (en) | 2014-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420125377.5U Expired - Fee Related CN203825100U (en) | 2014-03-19 | 2014-03-19 | Transformer transformation ratio tester |
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| CN (1) | CN203825100U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880616A (en) * | 2015-05-19 | 2015-09-02 | 苏州市华安普电力工程有限公司 | Transformation ratio automatic tester |
| CN106093609A (en) * | 2016-08-04 | 2016-11-09 | 深圳供电局有限公司 | Small-output-capacity current mutual inductance transformation ratio testing method and device |
-
2014
- 2014-03-19 CN CN201420125377.5U patent/CN203825100U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880616A (en) * | 2015-05-19 | 2015-09-02 | 苏州市华安普电力工程有限公司 | Transformation ratio automatic tester |
| CN106093609A (en) * | 2016-08-04 | 2016-11-09 | 深圳供电局有限公司 | Small-output-capacity current mutual inductance transformation ratio testing method and device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140910 Termination date: 20160319 |