CN203037842U - Miniature current transformer calibrator - Google Patents
Miniature current transformer calibrator Download PDFInfo
- Publication number
- CN203037842U CN203037842U CN 201220338460 CN201220338460U CN203037842U CN 203037842 U CN203037842 U CN 203037842U CN 201220338460 CN201220338460 CN 201220338460 CN 201220338460 U CN201220338460 U CN 201220338460U CN 203037842 U CN203037842 U CN 203037842U
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- CN
- China
- Prior art keywords
- transformer
- current
- signal transformer
- error
- primary current
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Provided is a miniature current transformer calibrator, characterized by comprising a signal transformer, and a primary current side of the signal transformer is provided with working circuit sampling shunts. A secondary current side of the signal transformer is provided with a center tap, in-phase component and quadrature component polarity selection switches, a multiple-disc conductance cabinet and a multiple-disc capacitance cabinet. The a primary current side of the signal transformer uses the working circuit sampling shunts in different resistance values to obtain voltage signals corresponding to measuring spans, and measured error is fiducial error, and a fiducial value is primary current. A differential current source of the miniature current transformer calibrator has enough high excitation voltage, and even if electric potential of a differential current node rise abnormally since unbalance degree is great, miniature current transformer calibrator can easily adjust balance and has enough sensitivity.
Description
Technical field
The utility model relates to mutual-inductor tester, and especially the micro-transformer of current tester belongs to the Electric Measurement Technology field.
Background technology
Micro-transformer of current refers to that the primary current that mechanical 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 ".Traditional mutual-inductor tester is pressed JB/T9306 " mutual-inductor tester technical conditions " and is made, and work loop rated current is 0.5A～5A, because working current is enough big, the conversion of range is flowed back to the road in difference and finished.The secondary current of micro-transformer of current has exceeded traditional mutual-inductor tester lower limit measurement range, because working current is very little, flow back to the road in difference and carry out the sensitivity restriction that range conversion has been subjected to tester, make traditional tester can not be used for the micro-transformer of current error measure.What the micro-transformer of current tester of present domestic use used is the voltage difference method, can not satisfy the requirement of standard and rules.Use non-standard method to cause different model in addition the tester same model different batches inconsistent to the measurement result of identical product.Influenced the enforcement of standard; Thereby be necessary to be improved on this basis.
Summary of the invention
The purpose of this utility model is to improve the measuring circuit of traditional mutual-inductor tester, a kind of JJG313 electric current differential technique principle that meets is proposed, can satisfy the micro-transformer of current tester of JB/T10665 standard-required, 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:
A kind of micro-transformer of current tester is provided, it is characterized in that: it comprises a signal transformer, and the primary current side of signal transformer is provided with work loop sampling shunt; Described signal transformer secondary current side is provided with center tap, in-phase component and quadrature component polar selecting switch, polydisc electricity guide box and polydisc capacitive; Use the work loop sampling shunt of different resistance values to obtain the voltage signal corresponding with measuring range in the primary current side of described signal transformer, the error that records is fiducial error, and fiducial value is primary current.
Described work loop sampling shunt selects for use 0.2 Ω and 0.02 Ω resistance value to obtain the voltage signal corresponding with measuring range respectively.
Described electric guide box
GAnd capacitive
CAdvancing dish by 5 ten forms.
The elementary errors current source that the utility model has the advantages that tester has sufficiently high driving voltage, and unusual the rising also is easy to adjustment and enough sensitivity is arranged even the current potential of difference current node is because uneven degree is big.
Description of drawings
Fig. 1 is the utility model circuit theory synoptic diagram.
Among the figure: R
N1And R
N2Be work loop sampling shunt, TV is that no-load voltage ratio is
Signal transformer, Ka is the in-phase component polar selecting switch, Kb is the quadrature component polar selecting switch, Kc is the error range-changing switch,
GBe polydisc electricity guide box,
CBe the polydisc capacitive, L
1And L
2Be the work loop current input terminal of tester, K and D are elementary errors current output terminal of tester.
Fig. 2 is the circuit theory synoptic diagram of a kind of embodiment of the utility model.
Embodiment
Below, by reference to the accompanying drawings 1 and 2 pairs of the utility model of accompanying drawing be further described:
Referring to Fig. 1, primary current
From work loop terminals L
1Flow to, from L
2Flow out, at shunt R
N1And R
N2Last generation voltage drop, after range switch Kc selects, output voltage
,
, R
NExpression R
N1Or R
N2One of,
Be applied to the winding W of signal transformer TV
1, at Secondary Winding W
2And W
3Last induction produces the secondary voltage that equates
With
, for center tap D,
=-
, polar selecting switch Ka and Kb are used for gating
Or
, the voltage behind the gating is applied to electric guide box
GAnd capacitive
COn, insert galvanometer between terminal K and D when measuring the micro-transformer of current error, when the galvanometer nulling, K and D equipotential, elementary errors electric current
Position and electric guide box according to polarity switch
GAnd capacitive
CIndicating value, can calculate conversion and to the error measuring value of primary current be:
If the no-load voltage ratio of tested micro-transformer of current is
k, then actual error is
, use ratio difference
fWhen representing with phase differential δ:
In the embodiment of Fig. 2,
,
R N1=0.2 Ω,
R N2=0.02 Ω,
m 1=0.5,
m 2=1.59,
GAdvance dish by 5 ten and form, scale range 0.011111S～0.0000001S,
CAdvance dish by 5 ten and form scale range 11.111 μ F～0.0001 μ F.Range switch is put R
N1The time, the in-phase error that first dish is put 1 correspondence is
, the % of unit, corresponding phase error is
, unit
CradArranging like this can make ratio difference and phase differential have identical scale factor.When
k=1000 o'clock, the resolution of measurement dish was 0.001%, can be used for measuring the error that class of accuracy 0.01 reaches following micro-transformer of current.When
k=10000 o'clock, range switch was put R
N2, can measure the error that class of accuracy 0.01 reaches following micro-transformer of current equally.
Though 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 the accompanying drawing is the illustration of property as an illustration only, is not to restriction of the present utility model, and the micro-transformer of current tester with above-mentioned technical characterictic all falls into this patent protection domain.
Claims (2)
1. micro-transformer of current tester, it is characterized in that: it comprises a signal transformer, the primary current side of signal transformer is provided with work loop sampling shunt; Described signal transformer secondary current side is provided with center tap, in-phase component and quadrature component polar selecting switch, polydisc electricity guide box and polydisc capacitive; Use the work loop sampling shunt of different resistance values to obtain the voltage signal corresponding with measuring range in the primary current side of signal transformer, the error that records is fiducial error, and fiducial value is primary current.
2. a kind of micro-transformer of current tester as claimed in claim 1 is characterized in that: described work loop sampling shunt selects for use 0.2 Ω and 0.02 Ω resistance value to obtain the voltage signal corresponding with measuring range respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220338460 CN203037842U (en) | 2012-07-13 | 2012-07-13 | Miniature current transformer calibrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220338460 CN203037842U (en) | 2012-07-13 | 2012-07-13 | Miniature current transformer calibrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203037842U true CN203037842U (en) | 2013-07-03 |
Family
ID=48689952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220338460 Expired - Fee Related CN203037842U (en) | 2012-07-13 | 2012-07-13 | Miniature current transformer calibrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203037842U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103543429A (en) * | 2012-07-13 | 2014-01-29 | 湖北天瑞电子有限公司 | Micro current transformer calibrator |
| CN106405465A (en) * | 2015-07-29 | 2017-02-15 | 中国电力科学研究院 | Voltage transformer measurement error checking method |
| CN109387802A (en) * | 2018-09-18 | 2019-02-26 | 国网江苏省电力有限公司淮安供电分公司 | A kind of rated current error testing method of high-tension current inductor |
| CN110471023A (en) * | 2019-08-02 | 2019-11-19 | 珠海科盈自动化系统有限公司 | A kind of test fixture and method of Direct Current Instrument |
-
2012
- 2012-07-13 CN CN 201220338460 patent/CN203037842U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103543429A (en) * | 2012-07-13 | 2014-01-29 | 湖北天瑞电子有限公司 | Micro current transformer calibrator |
| CN106405465A (en) * | 2015-07-29 | 2017-02-15 | 中国电力科学研究院 | Voltage transformer measurement error checking method |
| CN109387802A (en) * | 2018-09-18 | 2019-02-26 | 国网江苏省电力有限公司淮安供电分公司 | A kind of rated current error testing method of high-tension current inductor |
| CN110471023A (en) * | 2019-08-02 | 2019-11-19 | 珠海科盈自动化系统有限公司 | A kind of test fixture and method of Direct Current Instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20160713 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |