CN204302401U - A kind of three-phase Special Transformer Ratio measurement mechanism - Google Patents
A kind of three-phase Special Transformer Ratio measurement mechanism Download PDFInfo
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- CN204302401U CN204302401U CN201420710590.2U CN201420710590U CN204302401U CN 204302401 U CN204302401 U CN 204302401U CN 201420710590 U CN201420710590 U CN 201420710590U CN 204302401 U CN204302401 U CN 204302401U
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Abstract
This programme discloses a kind of three-phase Special Transformer Ratio measurement mechanism, comprise high-pressure side, low-pressure side, transformer, output control, three-phase power amplifier, high-pressure side sampling, low-pressure side sampling, DAC, ADC, CPU, display and printing equipment, transformer is all passed through in described high-pressure side, low-pressure side.Described output control, three-phase power amplifier, DAC, CPU, display and printing equipment connect successively, and the sampling of described high-pressure side and low-pressure side sampling control between CPU in output.This programme can survey single transformer no-load voltage ratio, automatically measures three-phase transformer wiring group, no-load voltage ratio.Automatically carry out group conversion, automatic switching range, after input standard no-load voltage ratio, automatically can calculate relative error, one-shot measurement completes, and automatically cuts off trial voltage, setting data, and measurement result is preserved automatically, data before can checking.
Description
Technical field
This programme relates to the technical field of expansion link, especially a kind of three-phase Special Transformer Ratio measurement mechanism.
Background technology
Transformation ratio testing experiment is that in power transformer commissioning test must do project, and the object measuring no-load voltage ratio is: check whether transformation ratio conforms to nameplate, to ensure to meet the requirements of voltage transformation; The situation of inspection voltage tap switch; Check the correctness of Transformer Winding turn ratio; After transformer breaks down, conventional no-load voltage ratio of measuring checks whether transformer exists turn-to-turn short circuit; There is provided the order of accuarcy of transformation ratio, to judge that can transformer paired running.GB GB1094-79 specifies: " transformation ratio of power transformer, except voltage at below 35kV and the transformer permissible variation being less than 3 for except ± 1%, other all transformer (specified tap) permissible variation is ± 0.5%." test time, the transformation ratio of each mutually corresponding tap should be checked.Namely should measure in each tap joint position of each coil.When not only a coil is with tap, can measure an all tap joint position of coil in turn, its relative band tap coil is then received in specified tap joint position.The transformer of triple coil, only can check the transformation ratio of two pairs of coils, and is recommended on those less two pairs of coils of short-circuit voltage and carries out.Also can apply voltage in side, all the other two lateral coils measure transformation ratio, to reduce the error caused by exciting curent.
The common method measuring no-load voltage ratio has twin voltage table method, no-load voltage ratio bridge method etc.Twin voltage table method adds the suitable stable alternating voltage of numerical value in the high-pressure side (or low-pressure side) of transformer, then also will induce corresponding voltage in the low-pressure side (or high-pressure side) of correspondence, measure the magnitude of voltage of both sides with the voltage table being not less than 0.5 grade that two ranges are suitable simultaneously, again according to the reading of voltage table, calculate voltage ratio.Measurement is that the reading of two voltage tables must read simultaneously, particularly when voltage fluctuation is larger, more should note this point.When no-load voltage ratio is larger or when supply voltage is higher, the voltage transformer (VT) of 0.2 grade should be adopted to coordinate the magnitude of voltage measuring both sides, then carry out no-load voltage ratio calculating.No-load voltage ratio bridge method is applying voltage U 1 in power supply high-pressure side, and secondary side is first and after an ammeter series connection, then with a fixed value resistance R2 parallel connection, finally again with one variable resistor R1 connects, and the voltage at R1 and R2 two ends and equal with U1.During measurement, by adjusting the size of R1, make amperometric current indication be 0, the electric current namely passed through in R1 and R2 is equal.When the electric current that R1 and R2 passes through is identical, then transformation ratio etc. and corresponding resistance ratio, i.e. no-load voltage ratio K=(R1+R2)/R1=1+R1/R2, as known R1 and R2, can obtain no-load voltage ratio value.
Above no-load voltage ratio method of testing is testing crew manual operations, in no-load voltage ratio test job, make in this way that not only test connection comparatively bothers, running program is loaded down with trivial details, inefficiency (operating rate is slow, operating personnel are many), and when testing D.yn11 type transformer, wiring is easier to make mistakes with dangerous.This is because when applying trial voltage to transformer two-phase, need to carry out short circuit to corresponding terminal, if careless wrong line, be just easy to cause short circuit, damage equipment.
Therefore we need to develop a kind of high-grade 32 single-chip microcomputers is core, and the manufacturing process being equipped with high-speed peripheral chip and advanced person combines, and it can measure no-load voltage ratio and the group of single-phase, three-phase transformer, voltage transformer (VT) automatically.Instrument wiring is simple, easy for operation, and instrument more advanced in power transformer no-load voltage ratio group characteristic test both at home and abroad at present, with applicable users' needs.
Utility model content
For the problems referred to above, this programme aims to provide a kind of three-phase Special Transformer Ratio measurement mechanism.
For realizing this technical purpose, the scheme of this programme is: a kind of three-phase Special Transformer Ratio measurement mechanism, comprise high-pressure side, low-pressure side, transformer, output control, three-phase power amplifier, high-pressure side sampling, low-pressure side sampling, DAC, ADC, CPU, display and printing equipment, transformer is all passed through in described high-pressure side, low-pressure side.Described output control, three-phase power amplifier, DAC, CPU, display and printing equipment connect successively, and the sampling of described high-pressure side and low-pressure side sampling control between CPU in output.
This programme can survey single transformer no-load voltage ratio.Automatic measurement three-phase transformer wiring group, no-load voltage ratio.Automatically group conversion is carried out.Automatic switching range.After input standard no-load voltage ratio, automatically can calculate relative error.One-shot measurement completes, and automatically cuts off trial voltage.Setting data, measurement result is preserved automatically, data before can checking.It market is mostly single-phase measurement no-load voltage ratio, after one phase is measured, change other phases again to measure, so just expend time in very much, and have considerable special transformer to have phase place to change, angle requirement, so we can be improved, three-phase exports simultaneously, not only can measure no-load voltage ratio/group, can also measure phase place/angle simultaneously, reach the effect of a tractor serves several purposes.
Accompanying drawing explanation
Fig. 1 is this programme block diagram;
Fig. 2 position this programme hardware platform;
Fig. 3 is this programme software flow pattern.
Embodiment
Below in conjunction with accompanying drawing basis and specific embodiment, this programme is described in further details.
As shown in Figure 1, a kind of three-phase Special Transformer Ratio measurement mechanism of this programme embodiment, comprise high-pressure side 1, low-pressure side 2, transformer 3, output control 4, three-phase power amplifier 5, high-pressure side sampling 6, low-pressure side sampling 7, DAC8, ADC9, CPU10, display and printing equipment 11, described high-pressure side 1, low-pressure side are all by transformer 3.Described output control 4, three-phase power amplifier 5, DAC8, CPU10, display and printing equipment 11 connect successively, and described high-pressure side sampling 6 and low-pressure side sampling export between control 4 and CPU10 7.
This programme can survey single transformer no-load voltage ratio.Automatic measurement three-phase transformer wiring group, no-load voltage ratio.Automatically group conversion is carried out.Automatic switching range.After input standard no-load voltage ratio, automatically can calculate relative error.One-shot measurement completes, and automatically cuts off trial voltage.Setting data, measurement result is preserved automatically, data before can checking.It market is mostly single-phase measurement no-load voltage ratio, after one phase is measured, change other phases again to measure, so just expend time in very much, and have considerable special transformer to have phase place to change, angle requirement, so we can be improved, three-phase exports simultaneously, not only can measure no-load voltage ratio/group, can also measure phase place/angle simultaneously, reach the effect of a tractor serves several purposes.Wherein ARM hardware platform completes LCD menu, test data display; Keyboard scan; Micro-ly play control; PC-RS232 communicates; Programming amplifying controls; Export and control; DAC sends out ripple and controls; (reserving) is interrupted in power amplifier protection; Carry out with FPGA communicating, exchanges data; Calculating voltage effective value, phase place, no-load voltage ratio, group etc.FPGA hardware platform selects the low cost CYCLONE-II family chip EP2C8-T144 of ALTERA company, completes ADC sampling; FIR filtering; DFT converts.
The above; be only the preferred embodiment of this programme; not in order to limit this programme, every technical spirit according to this programme above embodiment is done any trickle amendment, equivalently replace and improve, within the protection domain that all should be included in this programme technical scheme.
Claims (1)
1. a three-phase Special Transformer Ratio measurement mechanism, comprise high-pressure side, low-pressure side, transformer, output control, three-phase power amplifier, high-pressure side sampling, low-pressure side sampling, DAC, ADC, CPU, display and printing equipment, it is characterized in that: transformer is all passed through in described high-pressure side, low-pressure side.Described output control, three-phase power amplifier, DAC, CPU, display and printing equipment connect successively, and the sampling of described high-pressure side and low-pressure side sampling control between CPU in output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420710590.2U CN204302401U (en) | 2014-11-24 | 2014-11-24 | A kind of three-phase Special Transformer Ratio measurement mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420710590.2U CN204302401U (en) | 2014-11-24 | 2014-11-24 | A kind of three-phase Special Transformer Ratio measurement mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204302401U true CN204302401U (en) | 2015-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420710590.2U Expired - Fee Related CN204302401U (en) | 2014-11-24 | 2014-11-24 | A kind of three-phase Special Transformer Ratio measurement mechanism |
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| CN (1) | CN204302401U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271830A (en) * | 2017-05-25 | 2017-10-20 | 保定丰源电子科技有限公司 | A kind of no-load voltage ratio quick calculation method under special transformer non-equilibrium state |
| CN114280387A (en) * | 2021-12-03 | 2022-04-05 | 国网浙江省电力有限公司双创中心 | Transformation ratio testing device, transformation ratio testing method, device and medium |
| CN114740246A (en) * | 2022-03-25 | 2022-07-12 | 苏州熠品质量技术服务有限公司 | Automatic measuring device for working voltage of transformer |
-
2014
- 2014-11-24 CN CN201420710590.2U patent/CN204302401U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271830A (en) * | 2017-05-25 | 2017-10-20 | 保定丰源电子科技有限公司 | A kind of no-load voltage ratio quick calculation method under special transformer non-equilibrium state |
| CN107271830B (en) * | 2017-05-25 | 2019-12-20 | 保定丰源电子科技有限公司 | Method for rapidly calculating transformation ratio of special transformer in unbalanced state |
| CN114280387A (en) * | 2021-12-03 | 2022-04-05 | 国网浙江省电力有限公司双创中心 | Transformation ratio testing device, transformation ratio testing method, device and medium |
| CN114740246A (en) * | 2022-03-25 | 2022-07-12 | 苏州熠品质量技术服务有限公司 | Automatic measuring device for working voltage of transformer |
| CN114740246B (en) * | 2022-03-25 | 2023-01-31 | 苏州熠品质量技术服务有限公司 | Automatic measuring device for working voltage of transformer |
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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: 20150429 Termination date: 20171124 |