CN202025043U - Improved transformation ratio tester - Google Patents
Improved transformation ratio tester Download PDFInfo
- Publication number
- CN202025043U CN202025043U CN2010205991987U CN201020599198U CN202025043U CN 202025043 U CN202025043 U CN 202025043U CN 2010205991987 U CN2010205991987 U CN 2010205991987U CN 201020599198 U CN201020599198 U CN 201020599198U CN 202025043 U CN202025043 U CN 202025043U
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- power supply
- load voltage
- switching
- polarity
- voltage ratio
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Abstract
The utility model relates to an improved transformation ratio tester, comprising a standard power supply, a switching/short circuit relay, a polarity detection unit, an AC/DC switch power supply, an A/D converter and a one-chip microcomputer control unit. The standard power supply provides double voltage sources and is applied to a high-voltage side of a transformer; the switching/short circuit relay is used for multipath gating or short circuit of two paths; the polarity detection unit is used for detecting and storing a needed pole, and the detector provides a signal of a correct polarity when the circuit needs to be activated; the AC/DC switch power supply converts AC to DC; the A/D converter transits simulation signals to digital signals; and the one-chip microcomputer control unit takes a high speed microcontroller as the core and adopts a complete digitalized design. Measuring result of the improved transformation ratio tester is consistent with a real value of the transformer, and avoids misjudgment, with test time shortened and work efficiency improved.
Description
Technical field
The utility model relates to transformer and detects equipment technical field, especially a kind of modified no-load voltage ratio tester.
Background technology
The no-load voltage ratio test is one of conventional test project in transformer manufacturing and the maintenance process.Our the BBC6638 type no-load voltage ratio tester that uses only is applicable to the no-load voltage ratio test of the transformer of three-phase no-load voltage ratio balance at present.And it is just inapplicable for the unbalanced grounding transformer of three-phase no-load voltage ratio of picture think of source manufacturer production, there is error in test data, and three-phase no-load voltage ratio unbalance factor reaches 0.6%, exceeds the testing regulations required standard, measurement result can not reflect the transformer situation truly, causes erroneous judgement.
Summary of the invention
The utility model overcomes the problem of above-mentioned technical existence, and a kind of modified no-load voltage ratio tester is provided.
The technical solution of the utility model is: the modified no-load voltage ratio tester is used for mutual inductor and comprises no-load voltage ratio three-phase no-load voltage ratio balance and the unbalanced transformer of three-phase no-load voltage ratio the test of the various wiring groups of Z type.By reference power supply, switching/short-circuit relay, polarity detection, AC/DC Switching Power Supply, A/D converter and Single-chip Controlling unit totally six parts form.Reference power supply provides double voltage source, is added on the transformer high-voltage side; Switching/short-circuit relay is used for the multi channel selecting or the short circuit of two-way wherein; The polarity detecting unit is used to detect and preserve required polarity, and when the needs active circuit, detecting device provides the signal of correct polarity; The AC/DC Switching Power Supply is converted to DC quantity to of ac; A/D converter is analog signal conversion a digital signal; The Single-chip Controlling unit is core with the High Speed Microcontroller, the total digitalization design, and test data is stable, reliable, good reproducibility.
Concrete improvement project is as follows:
The circuit board of a, redesign instrument increases by three short circuits relay Sa, Sb, Sc and control section, the relay design figure and the figure three relay board pictorial diagram of seeing figure two testers.
B, redesign computing machine plate increase correspondent control circuits, increase photoisolator, see figure four instrument computing machine plate pictorial diagram.
C, redesign software program increase control corresponding function and calculation procedure, measure and the automatic computation purpose of three-phase no-load voltage ratio unbalance factor to reach the no-load voltage ratio of finishing the unbalanced grounding transformer of three-phase no-load voltage ratio, finally reach request for utilization.
Program is carried out two parts reorganization, make instrument can satisfy the no-load voltage ratio test of the various wiring group transformers of three-phase no-load voltage ratio balance, can realize the no-load voltage ratio measurement of the unbalanced grounding transformer of three-phase no-load voltage ratio and the automatic calculating of three-phase no-load voltage ratio unbalance factor again.And, can carry out the judgement of tap automatically to common transformer.
The utility model technical indicator:
1, is applicable to test single-phase, three phase excitation no-load voltage ratio (simultaneously), promptly to mutual inductor and comprise the various wiring group transformers of Z type and the automatic calculating of test of the no-load voltage ratio of three-phase no-load voltage ratio balun and three-phase no-load voltage ratio unbalance factor.
2, on-load voltage: 110V/220V
3, measurement range: 1.000～5000
4, accuracy: 0.2 grade
5, tapping point setting: three nineteen tapping points can be provided with the branch ad valorem arbitrarily
6, connect group selection: connect group arbitrarily
Of the present utility model have a suitable effect:
1, can judge group and polarity automatically, its large-screen lc screen can intuitively show information such as single-phase (three-phase) no-load voltage ratio, error, tap position and three-phase no-load voltage ratio unbalance factor.
2, instruments design has tap winding testing longitudinal function, can judge tap position automatically and carry out the storage of phase strain ratio value.
3, power lead, ground wire and the p-wire of instrument one end connect, and instrument need not to take out from packing case during use, avoid the instrument damaged in collision.
4, this instrument is not only applicable to the no-load voltage ratio test of common transformer and mutual inductor, and is applicable to the no-load voltage ratio test of the unbalanced grounding transformer of three-phase no-load voltage ratio of special construction and the automatic calculating of three-phase imbalance rate.Measurement result conforms to the transformer actual value, avoids erroneous judgement.Both shortened test period, increased work efficiency again.
Description of drawings
Fig. 1 is the utility model circuit theory diagrams;
Fig. 2 is a relay switch unit design drawing of the present utility model;
Fig. 3 is a program flow diagram of the present utility model.
Embodiment
As Fig. 1, the modified no-load voltage ratio tester, by reference power supply, switching/short-circuit relay, polarity detection, AC/DC Switching Power Supply, A/D converter and Single-chip Controlling unit totally six parts form.Reference power supply provides double voltage source, is added on the transformer high-voltage side; Switching/short-circuit relay is used for the multi channel selecting or the short circuit of two-way wherein; The polarity detecting unit is used to detect and preserve required polarity, and when the needs active circuit, detecting device provides the signal of correct polarity; The AC/DC Switching Power Supply is converted to DC quantity to of ac; A/D converter is analog signal conversion a digital signal; The Single-chip Controlling unit is core with the High Speed Microcontroller, the total digitalization design, and test data is stable, reliable, good reproducibility.
Concrete improvement project is as follows:
The circuit board of a, redesign instrument increases by three short circuits relay Sa, Sb, Sc and control section.
B, redesign computing machine plate increase correspondent control circuits, increase photoisolator.
C, redesign software program increase control corresponding function and calculation procedure, measure and the automatic computation purpose of three-phase no-load voltage ratio unbalance factor to reach the no-load voltage ratio of finishing the unbalanced grounding transformer of three-phase no-load voltage ratio, finally reach request for utilization.
Program is carried out two parts reorganization, make instrument can satisfy the no-load voltage ratio test of the various wiring group transformers of three-phase no-load voltage ratio balance, can realize the no-load voltage ratio measurement of the unbalanced grounding transformer of three-phase no-load voltage ratio and the automatic calculating of three-phase no-load voltage ratio unbalance factor again.And, can carry out the judgement of tap automatically to common transformer.
Program circuit is seen Fig. 3, and is as described below:
The wiring group of input transformer before the test, nominal transformation ratio, differential, total number of taps.Input finishes, and presses feeler switch, and software carries out the measurement of three-phase no-load voltage ratio successively according to the information of input.By Single-chip Controlling, press the special mode of connection before measuring:
A phase: high pressure side joint U_N, low pressure side joint w-u, short circuit v-n;
B phase: high pressure side joint V_N, low pressure side joint u-v, short circuit w-n;
C phase: high pressure side joint W_N, low pressure side joint v-w, short circuit u-n.
Finish back panel wiring, realize the low-pressure side short circuit, the high-pressure side powers up.Finish measurement to high pressure and low-pressure side voltage by software control, single-chip microcomputer carries out filtering, calculating, analysis to the data of measuring, and what determine current measurement automatically is which tap, the error of calculation then.If the situation of wiring errors such as high-low pressure reversal connection, instrument carries out corresponding prompting in test process.
Claims (1)
1. modified no-load voltage ratio tester, by reference power supply, switching/short-circuit relay, polarity detection, AC/DC Switching Power Supply, A/D converter and Single-chip Controlling unit totally six parts form, it is characterized in that reference power supply provides double voltage source, be added on the transformer high-voltage side; Switching/short-circuit relay is used for the multi channel selecting or the short circuit of two-way wherein; The polarity detecting unit is used to detect and preserve required polarity, and when the needs active circuit, detecting device provides the signal of correct polarity; The AC/DC Switching Power Supply is converted to DC quantity to of ac; A/D converter is analog signal conversion a digital signal; The Single-chip Controlling unit is core with the High Speed Microcontroller, the total digitalization design.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205991987U CN202025043U (en) | 2010-11-10 | 2010-11-10 | Improved transformation ratio tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205991987U CN202025043U (en) | 2010-11-10 | 2010-11-10 | Improved transformation ratio tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202025043U true CN202025043U (en) | 2011-11-02 |
Family
ID=44849988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205991987U Expired - Fee Related CN202025043U (en) | 2010-11-10 | 2010-11-10 | Improved transformation ratio tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202025043U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565557A (en) * | 2012-02-22 | 2012-07-11 | 明珠电气有限公司 | Method and device for testing transformation ratio of dry type transformer |
| CN104360175A (en) * | 2014-11-17 | 2015-02-18 | 国家电网公司 | Measurement method for head-dismounting-free turns ratio test of oil-oil sleeve pipe transformer |
| CN106124875A (en) * | 2016-06-13 | 2016-11-16 | 国家电网公司 | A kind of separate switching circuit measured for transformer voltage ratio |
-
2010
- 2010-11-10 CN CN2010205991987U patent/CN202025043U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565557A (en) * | 2012-02-22 | 2012-07-11 | 明珠电气有限公司 | Method and device for testing transformation ratio of dry type transformer |
| CN104360175A (en) * | 2014-11-17 | 2015-02-18 | 国家电网公司 | Measurement method for head-dismounting-free turns ratio test of oil-oil sleeve pipe transformer |
| CN106124875A (en) * | 2016-06-13 | 2016-11-16 | 国家电网公司 | A kind of separate switching circuit measured for transformer voltage ratio |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111102 Termination date: 20111110 |