CN103543429A - Micro current transformer calibrator - Google Patents
Micro current transformer calibrator Download PDFInfo
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- CN103543429A CN103543429A CN201210241729.9A CN201210241729A CN103543429A CN 103543429 A CN103543429 A CN 103543429A CN 201210241729 A CN201210241729 A CN 201210241729A CN 103543429 A CN103543429 A CN 103543429A
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- transformer
- current
- micro
- error
- primary current
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Abstract
A micro current transformer calibrator is characterized by comprising a signal transformer. A working loop sampling diverter is arranged on a primary current side of the signal transformer, and a central shaft head, an in-phase component and orthogonal component polarity selection switch, a multi-disc conductance box and a multi-disc capacitance box are arranged on a secondary current side of the signal transformer. The working loop sampling diverter different in resistance value is utilized on the primary current side of a signal generator to acquire and measure voltage signals corresponding to measuring range, a measured error is a fiducial error, and fiducial value is primary current. An elementary-error current source of the micro current transformer calibrator has enough high excitation voltage, and even if electric potential of a difference current node is abnormally increased due to large unbalance degree, balance is easy to adjust and enough sensitivity is realized.
Description
Technical field
The present invention relates to mutual-inductor tester, especially micro-transformer of current tester, belongs to 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, according to national metrological verification regulations JJG313 < < Verification of Measuring Current Transformer > >, is used differential technique calibrating.Traditional mutual-inductor tester is pressed JB/T9306 < < mutual-inductor tester technical conditions > > and is manufactured, work loop rated current is 0.5A～5A, because working current is enough large, the conversion of range is flowed back to road in difference and is completed.The secondary current of micro-transformer of current has exceeded traditional mutual-inductor tester lower limit measurement range, because working current is very little, on the poor road of flowing back to, carry out the sensitivity restriction that range conversion has been subject to tester, make traditional tester can not be for micro-transformer of current error measure.What the micro-transformer of current tester of current domestic use was used is voltage difference method, can not meet the requirement of standard and rules.Use non-standard method to cause the tester of even same model different batches of different model inconsistent to the measurement result of identical product.Affected the enforcement of standard; Thereby be necessary to be improved on this basis.
Summary of the invention
The object of the invention 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 meet the micro-transformer of current tester of JB/T10665 standard-required, for implementing micro-transformer of current industry standard, provide technical support.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of micro-transformer of current tester is provided, 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; In the primary current side of described signal generator, use the work loop sampling shunt of different resistance values to obtain the voltage signal corresponding with measuring range, the error recording is fiducial error, and fiducial value is primary current.
Described work loop sampling shunt selects respectively 0.2 Ω and 0.02 Ω resistance value to obtain the voltage signal corresponding with measuring range.
Described electric guide box
gand capacitive
cby 5 ten, entering dish forms.
Advantage of the present invention is that the elementary errors current source of tester has sufficiently high driving voltage, even if the current potential of difference current node, because uneven degree raises greatly and extremely, is also easy to adjustment and has enough sensitivity.
Accompanying drawing explanation
Fig. 1 is circuit theory schematic diagram of the present invention.
In figure: R
n1and R
n2be work loop sampling shunt, TV is that no-load voltage ratio is
signal transformer, Ka is in-phase component polar selecting switch, Kb is quadrature component polar selecting switch, Kc is error range-changing switch,
gpolydisc electricity guide box,
cpolydisc 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 schematic diagram of an embodiment of the present invention.
Embodiment
Below, by reference to the accompanying drawings 1 and accompanying drawing 2 the invention will 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
n2upper generation voltage drop, after range switch Kc selects, output voltage
,
, R
nrepresent R
n1or R
n2one of,
be applied to a winding W of signal transformer TV
1, at Secondary Winding W
2and W
3upper induction produces equal secondary voltage
with
, for center tap D,
=-
, polar selecting switch Ka and Kb are used for gating
or
, the voltage after gating is applied to electric guide box
gand capacitive
cupper, while measuring micro-transformer of current error, between terminal K and D, access galvanometer, when galvanometer nulling, K and D equipotential, elementary errors electric current
.According to the position of polarity switch and electric guide box
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, actual error is
, use ratio difference
fwhile 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,
gby 5 ten, enter dish and form, scale range 0.011111S～0.0000001S,
cby 5 ten, enter dish and form, scale range 11.111 μ F～0.0001 μ F.Range switch is put R
n1time, the in-phase error that the first dish is put 1 correspondence is
, the % of unit, corresponding phase error is
, unit
crad.Arranging 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 of class of accuracy 0.01 and following micro-transformer of current.When
k=10000 o'clock, range switch was put R
n2, can measure equally the error of class of accuracy 0.01 and following micro-transformer of current.
Although shown detailed embodiment of the present invention above, those skilled in the art is under prerequisite of the present invention, can carry out part modifications and changes; The content of mentioning in description above and accompanying drawing, only as illustrative case, is not limitation of the present invention, and the micro-transformer of current tester with above-mentioned technical characterictic all falls into this patent protection domain.
Claims (3)
1. a micro-transformer of current tester, 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; In the primary current side of described signal generator, use the work loop sampling shunt of different resistance values to obtain the voltage signal corresponding with measuring range, the error recording 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 respectively 0.2 Ω and 0.02 Ω resistance value to obtain the voltage signal corresponding with measuring range.
3. micro-transformer of current tester according to claim 1, is characterized in that: electric guide box
gand capacitive
cby 5 ten, entering dish forms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210241729.9A CN103543429A (en) | 2012-07-13 | 2012-07-13 | Micro current transformer calibrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210241729.9A CN103543429A (en) | 2012-07-13 | 2012-07-13 | Micro current transformer calibrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103543429A true CN103543429A (en) | 2014-01-29 |
Family
ID=49967052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210241729.9A Pending CN103543429A (en) | 2012-07-13 | 2012-07-13 | Micro current transformer calibrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103543429A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443561A (en) * | 2016-09-23 | 2017-02-22 | 国网江西省电力公司电力科学研究院 | Overall inspection method and apparatus for electric energy metering devices of 35kV or below |
| 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 |
| CN110824407A (en) * | 2019-11-21 | 2020-02-21 | 上海方融科技有限责任公司 | High-precision current mutual inductance self-adjustment detection device |
| CN111025211A (en) * | 2019-11-27 | 2020-04-17 | 中国电力科学研究院有限公司 | Magnitude tracing method and system of broadband voltage standard measuring device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11142459A (en) * | 1997-11-07 | 1999-05-28 | Soken Denki Kk | Transformer error testing device with zero load function |
| CN1851495A (en) * | 2006-06-01 | 2006-10-25 | 宁波市科技园区合众电力自动化设备有限公司 | Current mutual inductor in-situ detecting device and method |
| CN201203666Y (en) * | 2008-06-06 | 2009-03-04 | 北京浩霆光电技术有限责任公司 | Multifunctional mutual-inductor tester |
| CN101493509A (en) * | 2009-01-13 | 2009-07-29 | 国网电力科学研究院 | Verifying apparatus for measuring extra-high voltage transformer error |
| CN203037842U (en) * | 2012-07-13 | 2013-07-03 | 湖北天瑞电子有限公司 | Miniature current transformer calibrator |
-
2012
- 2012-07-13 CN CN201210241729.9A patent/CN103543429A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11142459A (en) * | 1997-11-07 | 1999-05-28 | Soken Denki Kk | Transformer error testing device with zero load function |
| CN1851495A (en) * | 2006-06-01 | 2006-10-25 | 宁波市科技园区合众电力自动化设备有限公司 | Current mutual inductor in-situ detecting device and method |
| CN201203666Y (en) * | 2008-06-06 | 2009-03-04 | 北京浩霆光电技术有限责任公司 | Multifunctional mutual-inductor tester |
| CN101493509A (en) * | 2009-01-13 | 2009-07-29 | 国网电力科学研究院 | Verifying apparatus for measuring extra-high voltage transformer error |
| CN203037842U (en) * | 2012-07-13 | 2013-07-03 | 湖北天瑞电子有限公司 | Miniature current transformer calibrator |
Non-Patent Citations (1)
| Title |
|---|
| 王文海等: "400HZ电流互感器校验仪的检定", 《测量与检修》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443561A (en) * | 2016-09-23 | 2017-02-22 | 国网江西省电力公司电力科学研究院 | Overall inspection method and apparatus for electric energy metering devices of 35kV or below |
| CN106443561B (en) * | 2016-09-23 | 2023-06-16 | 国网江西省电力公司电力科学研究院 | Integral inspection method and device for electric energy metering device with voltage of 35kV or below |
| 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 |
| CN110824407A (en) * | 2019-11-21 | 2020-02-21 | 上海方融科技有限责任公司 | High-precision current mutual inductance self-adjustment detection device |
| CN110824407B (en) * | 2019-11-21 | 2021-11-23 | 上海方融科技有限责任公司 | High-precision current mutual inductance self-adjustment detection device |
| CN111025211A (en) * | 2019-11-27 | 2020-04-17 | 中国电力科学研究院有限公司 | Magnitude tracing method and system of broadband voltage standard measuring device |
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Application publication date: 20140129 |