CN203164408U - Current transformer error testing circuit - Google Patents
Current transformer error testing circuit Download PDFInfo
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- CN203164408U CN203164408U CN 201320141627 CN201320141627U CN203164408U CN 203164408 U CN203164408 U CN 203164408U CN 201320141627 CN201320141627 CN 201320141627 CN 201320141627 U CN201320141627 U CN 201320141627U CN 203164408 U CN203164408 U CN 203164408U
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- current transformer
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- mutual inductor
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Abstract
The utility model relates to a current transformer error testing circuit, which comprises a test current transformer, a test main circuit, a DC excitation winding and a load winding, wherein the test current transformer is connected to the test main circuit in series, and the DC excitation winding and the load winding are connected with the test current transformer. Compared with the prior art, the current transformer error testing circuit has the advantages of simple structure, high test precision and the like.
Description
Technical field
The utility model relates to mutual inductor experimental technique field, especially relates to a kind of current transformer error hookup.
Background technology
The current transformer principle is according to electromagnetic induction principle.Current transformer is made up of iron core and the winding of closure.Its umber of turn seldom, string is in the circuit of the electric current that needs are measured, so it often has whole electric currents of circuit to flow through, the Secondary Winding turn ratio is more, is serially connected in measurement instrument and the protection loop.Continuous expansion along with the electric system transmission line capability, the application of novel current sensor in middle and high piezoelectricity net more and more widely, current sensor is as the important component part of electric power meter, the accuracy of its translation data and rationality are directly connected to the calculating of total errors of electric energy countings, therefore must carry out accuracy test to current sensor.A kind of current sensor error check-out console is disclosed as utility application 03271777.6, mainly the circuit of being made up of pressure regulator, current lifting device, standard current transformer, current-to-voltage converter and mutual-inductor tester connects, but this device is only applicable to the medium voltage network test.
Summary of the invention
The purpose of this utility model is exactly that a kind of simple in structure, current transformer error hookup that test accuracy is high is provided in order to overcome the defective that above-mentioned prior art exists.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of current transformer error hookup, comprise test current mutual inductor, test major loop, DC excitation winding and load winding, described test current mutual inductor is serially connected in the test major loop, and described DC excitation winding is connected with the test current mutual inductor respectively with the load winding.
Described test major loop comprises current lifting device, switch, second reometer and the stake resistance that connects successively, and described test current mutual inductor is serially connected between second reometer and stake resistance, and described current lifting device and stake resistance be ground connection respectively.
Described DC excitation winding comprises direct supply, adjustable resistance and first reometer that connects successively, and described first reometer is connected with direct supply.
Described load winding comprises inductive coil, the 3rd reometer and pull-up resistor, and described inductive coil winding is on the test current mutual inductor, and the inductive coil two ends connect the 3rd reometer and pull-up resistor respectively, described pull-up resistor ground connection.
Described test current mutual inductor is Verification of Measuring Current Transformer.
Compared with prior art, the utility model is additional DC excitation winding in hookup, control the DC current that flows into mutual inductor by the adjustable resistance of connecting in the DC excitation winding, under different direct current biasings, observe the variation of the faradic distortion degree of load end and progress of disease characteristic, thereby the error to current transformer detects, and has advantage simple in structure, that test accuracy is high.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.Present embodiment is that prerequisite is implemented with technical solutions of the utility model, provided detailed embodiment and concrete operating process, but protection domain of the present utility model is not limited to following embodiment.
As shown in Figure 1, a kind of current transformer error hookup, comprise test current mutual inductor CT, test major loop, DC excitation winding and load winding, described test current mutual inductor CT is serially connected in the test major loop, and described DC excitation winding is connected with the test current mutual inductor respectively with the load winding.Described test current mutual inductor is Verification of Measuring Current Transformer.
Described test major loop comprises current lifting device I, K switch, the second reometer A2 and the stake resistance Z that connects successively, and described test current mutual inductor CT is serially connected between the second reometer A2 and stake resistance Z, and described current lifting device I and stake resistance Z be ground connection respectively.Described DC excitation winding comprises direct supply E, adjustable resistance R and the first reometer A1 that connects successively, the described first reometer A1 is connected with direct supply E, described adjustable resistance R is connected with the first reometer A1 by lead L, and lead L walks around test current mutual inductor CT.Described load winding comprises inductive coil, the 3rd reometer A3 and pull-up resistor R
L, described inductive coil winding is on test current mutual inductor CT, and the inductive coil two ends connect the 3rd reometer A3 and pull-up resistor R respectively
L, described pull-up resistor R
LGround connection.
When utilizing above-mentioned current transformer error hookup to test, control the DC current that flows into mutual inductor by the adjustable resistance of connecting in the DC excitation winding, under different direct current biasings, observe the variation of the faradic distortion degree of load end and progress of disease characteristic, thereby the error of current transformer is detected.
According to test findings, DC magnetic bias current is less to the influence of Verification of Measuring Current Transformer angular difference.When the direct current ampere-turn reaches 9NI, be in the critical error place during 5% rated primary current; Only reach at 20% o'clock at primary current, angular difference is 13 minutes, surpasses 3 minutes angle of GB.Contrast GB 0.5S level is measured the error limit value with CT, with the measurement CT of the CT under the 9NI DC magnetic biasing as the 0.5s level, just can satisfy error range.
DC magnetic bias current is more obvious to measuring with the ratio influence of CT.When the direct current ampere-turn reaches 5NI, during 50%, 80% rated primary current, error divides-0.22 ,-0.24 respectively, and error range has surpassed the error of the 0.2S level of GB regulation, has reached 1.1 times to 1.2 times.When the direct current ampere-turn reaches 9NI, the error amount that the rated primary current error more than 20% has been stipulated in the GB has reached 1.6 times to 2.5 times.Same, be 5NI when above at the direct current ampere turns, the measurement of 0.2S level is measured as the 0.5S level with CT use CT, at this moment just can satisfy the measuring error size.
Claims (5)
1. current transformer error hookup, it is characterized in that, comprise test current mutual inductor, test major loop, DC excitation winding and load winding, described test current mutual inductor is serially connected in the test major loop, and described DC excitation winding is connected with the test current mutual inductor respectively with the load winding.
2. a kind of current transformer error hookup according to claim 1, it is characterized in that, described test major loop comprises current lifting device, switch, second reometer and the stake resistance that connects successively, described test current mutual inductor is serially connected between second reometer and stake resistance, and described current lifting device and stake resistance be ground connection respectively.
3. a kind of current transformer error hookup according to claim 1 is characterized in that, described DC excitation winding comprises direct supply, adjustable resistance and first reometer that connects successively, and described first reometer is connected with direct supply.
4. a kind of current transformer error hookup according to claim 1, it is characterized in that, described load winding comprises inductive coil, the 3rd reometer and pull-up resistor, described inductive coil winding is on the test current mutual inductor, the inductive coil two ends connect the 3rd reometer and pull-up resistor respectively, described pull-up resistor ground connection.
5. a kind of current transformer error hookup according to claim 1 is characterized in that, described test current mutual inductor is Verification of Measuring Current Transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320141627 CN203164408U (en) | 2013-03-26 | 2013-03-26 | Current transformer error testing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320141627 CN203164408U (en) | 2013-03-26 | 2013-03-26 | Current transformer error testing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203164408U true CN203164408U (en) | 2013-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320141627 Expired - Lifetime CN203164408U (en) | 2013-03-26 | 2013-03-26 | Current transformer error testing circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN203164408U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104950138A (en) * | 2015-07-22 | 2015-09-30 | 王振环 | Electromagnetic measuring instrument for detecting motion acceleration capacity of human body or limbs |
| CN106291431A (en) * | 2016-10-24 | 2017-01-04 | 中国科学院上海应用物理研究所 | A kind of tracking accuracy measuring method of current sensor |
| CN109490809A (en) * | 2018-12-12 | 2019-03-19 | 威胜信息技术股份有限公司 | The unpaired calibration method of CT DC current return |
| CN115394030A (en) * | 2022-08-02 | 2022-11-25 | 山东鑫泽消防技术服务有限公司 | Residual current electrical fire detector with re-detection function and use method |
-
2013
- 2013-03-26 CN CN 201320141627 patent/CN203164408U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104950138A (en) * | 2015-07-22 | 2015-09-30 | 王振环 | Electromagnetic measuring instrument for detecting motion acceleration capacity of human body or limbs |
| CN107976558A (en) * | 2015-07-22 | 2018-05-01 | 王振环 | For detecting the electromagnetic type measuring instrument of human body or limb motion acceleration capacity |
| CN107976558B (en) * | 2015-07-22 | 2020-03-24 | 诸暨市枫桥天竺五金油漆店 | Electromagnetic measuring instrument for detecting acceleration capacity of human body or limb movement |
| CN106291431A (en) * | 2016-10-24 | 2017-01-04 | 中国科学院上海应用物理研究所 | A kind of tracking accuracy measuring method of current sensor |
| CN106291431B (en) * | 2016-10-24 | 2018-11-27 | 中国科学院上海应用物理研究所 | A kind of tracking accuracy measurement method of current sensor |
| CN109490809A (en) * | 2018-12-12 | 2019-03-19 | 威胜信息技术股份有限公司 | The unpaired calibration method of CT DC current return |
| CN109490809B (en) * | 2018-12-12 | 2020-12-25 | 威胜信息技术股份有限公司 | Unpaired calibration method for CT direct current loop |
| CN115394030A (en) * | 2022-08-02 | 2022-11-25 | 山东鑫泽消防技术服务有限公司 | Residual current electrical fire detector with re-detection function and use method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130828 |
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| CX01 | Expiry of patent term |