CN202975313U - Ratio error self calibration system for miniature current transformer - Google Patents
Ratio error self calibration system for miniature current transformer Download PDFInfo
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- CN202975313U CN202975313U CN 201220338476 CN201220338476U CN202975313U CN 202975313 U CN202975313 U CN 202975313U CN 201220338476 CN201220338476 CN 201220338476 CN 201220338476 U CN201220338476 U CN 201220338476U CN 202975313 U CN202975313 U CN 202975313U
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Abstract
A ratio error self calibration system for a miniature current transformer comprises a 10-segment single disc miniature sensing diverter, a 5 A/0.5 A miniature current comparator, three multi-ratio miniature current comparators, a power supply current transformer, a test current source, an error measurement apparatus, a zeroing impedance casing and a galvanometer, wherein 5 A/0.5 A to 0.001 A ratio values are led out employing a reference current method self calibration line and a current comparator cascade single-disc induction diverter ratio expansion line. The ratio error self calibration system for a miniature current transformer is characterized in that the current ratio measuring ranges are divided into three segments as following: 5 A/0.5 A to 0.1 A, 5 A/0.05 A to 0.01 A and 5 A/0.005 A to 0.001 A, which are covered respectively by three multi-ratio miniature current comparators. The advantages are provided as following: the number of self calibration operation steps is small, the measuring range expansion efficiency is high, and value reproducibility is good.
Description
Technical field
The utility model relates to current transformer, and micro-transformer of current especially belongs to the Electric Measurement Technology field.
Background technology
Micro-transformer of current refers to that the primary current that machinery industry standard JB/T10665 " micro-transformer of current " defines is no more than 10A, secondary current 1mA～100mA, the power current mutual inductor that power supply minor electric energy meter and other instrument and meter use.The error of micro-transformer of current is used the differential technique calibrating according to national metrological verification regulations JJG313 " Verification of Measuring Current Transformer ".Differential technique need to use standard current transformer or the current comparator of same current ratio, the present domestic value standard of also not setting up micro-transformer of current, what check micro-transformer of current error was used is the voltage difference method, standard current transformer secondary circuit access shunt at rated secondary current 0.5A～5A obtains reference voltage, compares with the tested voltage that obtains on the load resistance that accesses tested micro-transformer of current secondary circuit.Use non-standard method to cause the disunity of error magnitude, affected the enforcement of standard.
Summary of the invention
The purpose of this utility model is by the self calibration of miniature inductive shunt and miniature current comparator and Range Extension operation, press the metrology definition and derive little current ratio standard value, be used for the error testing of micro-transformer of current, provide technical support for implementing the micro-transformer of current industry standard.
The technical scheme that its technical matters that solves the utility model adopts is achieved in that
A kind of micro-transformer of current ratio error self-calibration system is provided, it forms self-calibration system jointly by one 10 sections single-deck miniature inductive shunts, miniature current comparator of 5A/0.5A, three miniature current comparators of polytropic ratio, supply current mutual inductor, test current source, error measuring means, zeroing impedance case, galvanometer, adopts reference current method self-correcting circuit and current comparator cascade single-deck inductive shunt ratio extended circuit to derive 5A/0.5A～0.001A ratio value; It is characterized in that, the current ratio range is divided into three sections of 5A/0.5A～0.1A, 5A/0.05A～0.01A, 5A/0.005A～0.001A, covers with three miniature current comparator segmentations of polytropic ratio.
The utility model has the advantages that the self calibration operation steps is few, Range Extension efficient is high, and realization is good.
Description of drawings
Fig. 1 is the miniature inductive shunt self calibration conspectus that the utility model adopts.
Fig. 2 is the conspectus of the miniature current comparator cascade miniature inductive shunt extensive ratio range of the utility model employing.
Fig. 3 is the conspectus of the miniature current comparator calibrating of the polytropic ratio of the utility model employing micro-transformer of current.
In figure: 1. test current source, 2. 10 sections single-deck miniature inductive shunts, 3. the miniature current comparator of 5A/0.5A, 4. error measuring means, the 5. miniature current comparator of polytropic ratio, 6. supply current mutual inductor, 7. the impedance case returns to zero, 8. power frequency galvanometer, 9. micro-transformer of current, 10. secondary load resistance.
Embodiment
Below, 1 be further described to 3 pairs of the utility model of accompanying drawing by reference to the accompanying drawings.
In Fig. 1, miniature current comparator 3 is as with reference to current transformer, current ratio 5A/0.5A, no-load voltage ratio 10/1; Inductive shunt 2 has 10 sections, and putting the primary current tap is n-1 and n.Note ε n is n section streaming error,
Be the reference current transformer error,
Be measured value, have:
After having carried out 10 sections measurements, the addition of each section error:
Obtain:
Can calculate accordingly inductive shunt 2 and put ratio 10/
KError ε k and the error ε s of the 5A/0.5A range of miniature current comparator 3:
In Fig. 2, the output of the secondary of miniature current comparator 3 is connected with the first paragraph of miniature inductive shunt through supply current mutual inductor 6, forms the cascade circuit, and the current ratio after cascade equals 5A/0.05A.The miniature current comparator 5 of polytropic ratio is put current ratio 5A/0.05A, is in the calibrating state that is subjected to.The measurement result that error measuring means 4 is obtained adds that the error value epsilon s of miniature current comparator 3 and inductive shunt 2 and ε k are exactly the error of the miniature current comparator 5 of polytropic ratio.As long as change the segmented mode of inductive shunt 2, just can obtain other current ratio such as 5A/0.02A, 5A/0.01A etc.If in Fig. 2 circuit, miniature current comparator 3 is replaced by the miniature current comparator of next polytropic ratio with 5A/0.05A, continue and inductive shunt 2 cascades, just can obtain 5A/0.005A, 5A/0.002A, 5A/0.001A etc. the current ratio value, and then pass to the miniature current comparator of another polytropic ratio.Because miniature current comparator 3 is operated in zero magnetic flux state, can not export secondary current, its secondary loop current needs supply current mutual inductor 6 to produce, and when adjusting zeroing impedance case 7 made galvanometer 8 nulling, miniature current comparator 3 arrived zero magnetic flux states.Can derive respectively the standard value of the various current ratios that micro-transformer of current need to use with above step.
In Fig. 3, micro-transformer of current 9 is in accredited state, and its secondary circuit is by the load resistance 10 of product technology condition access regulation.The miniature current comparator 5 of polytropic ratio is as etalon, and test current source 1 provides the primary current of regulation, measures error by error measuring means 4 at last.The error of miniature current comparator is 10
-5Below magnitude, the calibrating micro-transformer of current does not generally need to revise the error that comparator is introduced.
Although above shown detailed embodiment of the present utility model, those skilled in the art is under prerequisite of the present utility model, can carry out the part modifications and changes; The content of mentioning in description above and accompanying drawing is the illustration of property as an illustration only, is not limitation of the utility model, and the micro-transformer of current ratio error self-calibration system with above-mentioned technical characterictic all falls into this patent protection domain.
Claims (1)
1. micro-transformer of current ratio error self-calibration system, it forms self-calibration system jointly by one 10 sections single-deck miniature inductive shunts, miniature current comparator of 5A/0.5A, three miniature current comparators of polytropic ratio, supply current mutual inductor, test current source, error measuring means, zeroing impedance case, galvanometer, adopts reference current method self-correcting circuit and current comparator cascade single-deck inductive shunt ratio extended circuit to derive 5A/0.5A～0.001A ratio value; It is characterized in that, described current ratio range is divided into three sections of 5A/0.5A～0.1A, 5A/0.05A～0.01A, 5A/0.005A～0.001A, and covers with three miniature current comparator segmentations of polytropic ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220338476 CN202975313U (en) | 2012-07-13 | 2012-07-13 | Ratio error self calibration system for miniature current transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220338476 CN202975313U (en) | 2012-07-13 | 2012-07-13 | Ratio error self calibration system for miniature current transformer |
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| CN202975313U true CN202975313U (en) | 2013-06-05 |
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| CN 201220338476 Expired - Fee Related CN202975313U (en) | 2012-07-13 | 2012-07-13 | Ratio error self calibration system for miniature current transformer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103543428A (en) * | 2012-07-13 | 2014-01-29 | 天门市电工仪器仪表研究所 | Miniature current transformer ratio error self-calibration system |
| CN103823100A (en) * | 2013-07-29 | 2014-05-28 | 中国计量科学研究院 | High-accuracy current comparator and self-checking method |
| CN104297710A (en) * | 2014-09-26 | 2015-01-21 | 天津电气科学研究院有限公司 | High-current sensor calibration method based on curve fitting method |
| CN106405469A (en) * | 2016-10-10 | 2017-02-15 | 中国电力科学研究院 | Variable-ratio magnetic potential comparison type transformer calibration system capable of self-calibration |
-
2012
- 2012-07-13 CN CN 201220338476 patent/CN202975313U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103543428A (en) * | 2012-07-13 | 2014-01-29 | 天门市电工仪器仪表研究所 | Miniature current transformer ratio error self-calibration system |
| CN103543428B (en) * | 2012-07-13 | 2017-01-25 | 天门市电工仪器仪表研究所 | Miniature current transformer ratio error self-calibration system |
| CN103823100A (en) * | 2013-07-29 | 2014-05-28 | 中国计量科学研究院 | High-accuracy current comparator and self-checking method |
| CN104297710A (en) * | 2014-09-26 | 2015-01-21 | 天津电气科学研究院有限公司 | High-current sensor calibration method based on curve fitting method |
| CN106405469A (en) * | 2016-10-10 | 2017-02-15 | 中国电力科学研究院 | Variable-ratio magnetic potential comparison type transformer calibration system capable of self-calibration |
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Legal Events
| 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: 20130605 Termination date: 20170713 |