CN204028194U - A kind of self compensation small current mutual inductor - Google Patents
A kind of self compensation small current mutual inductor Download PDFInfo
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- CN204028194U CN204028194U CN201420342501.3U CN201420342501U CN204028194U CN 204028194 U CN204028194 U CN 204028194U CN 201420342501 U CN201420342501 U CN 201420342501U CN 204028194 U CN204028194 U CN 204028194U
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- mutual inductor
- small current
- current mutual
- self compensation
- coil
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Abstract
Self compensation small current mutual inductor, comprises primary winding and secondary coil, it is characterized in that: be also provided with the interpole coil of connecting with secondary coil in Current Transformer Secondary side, described interpole coil is connected with secondary coil through power amplification circuit.CT after compensation, its performance ratio and angular difference reduce greatly, and it is good that the linearity keeps, and improved the accurate precision of mutual inductor, and then improved the precision of checkout equipment insulation Leakage Current signal.
Description
Technical field
The design relates to self compensation small current mutual inductor, belongs to electrical equipment detection technique field.
Background technology
(CTD is used for the important measurement mechanism of collecting device insulated leakage current signal to small current mutual inductor in dielectric loss digitized measurement system, the little CT of high precision, high stability is the important guarantee of accurately measuring dielectric loss.Due to the error of CT line having property degree and angular difference, can not meet the requirement of dielectric loss measurement, must compensate.
Summary of the invention
According to above-mentioned requirements, the design provides a kind of self compensation small current mutual inductor, increases by an interpole coil at secondary side, produces the error of an additional excitatory mmf of magnetomotive force compensation to reduce to be produced by excitatory mmf from CT secondary side.
For achieving the above object, the design realizes by following technological means:
A kind of self compensation small current mutual inductor, comprises primary winding and secondary coil, it is characterized in that: be also provided with the interpole coil of connecting with secondary coil in Current Transformer Secondary side, described interpole coil is connected with secondary coil through power amplification circuit.
Preferred:
Described a kind of self compensation small current mutual inductor, is characterized in that: described power amplification circuit is made up of operational amplifier A 1 and power amplifier.
Described a kind of self compensation small current mutual inductor, is characterized in that: the output after operational amplifier A 2 is amplified of the voltage signal of described secondary coil.
Described a kind of self compensation small current mutual inductor, is characterized in that: in secondary side output circuit, be also provided with load R.
Described a kind of self compensation small current mutual inductor, is characterized in that: the iron core of described circuit mutual inductor adopts the ferromagnetic material with high initial magnetoconductivity.
Described a kind of self compensation small current mutual inductor, is characterized in that: described ferromagnetic material is permalloy.
The invention has the beneficial effects as follows: the CT after compensation, its performance ratio and angular difference reduce greatly, and it is good that the linearity keeps, and improved the accurate precision of mutual inductor, and then improved the precision of checkout equipment insulation Leakage Current signal.
Brief description of the drawings
Fig. 1 is the utility model example structure schematic diagram.
Embodiment
Below in conjunction with Figure of description, design is further described.
As shown in Figure 1, a kind of self compensation small current mutual inductor, comprises primary winding and secondary coil, it is characterized in that: be also provided with the interpole coil of connecting with secondary coil in Current Transformer Secondary side, described interpole coil is connected with secondary coil through power amplification circuit.
Due to the effect of exciting curent, in compensating coil, induce electromotive force e, e after amplifying, amplifier A1 is connected with secondary coil by power amplification circuit.According to superposition principle, can think that e produces the offset current with a certain size and phase place on secondary coil and load R, it and secondary coil formation demagnetization magnetic potential, the impact of having offset excitatory magnetic potential, like this, first and second and compensating coil formed a self balancing duty.The voltage signal at load two ends amplifies output through amplifier A2.
Preferred:
Described a kind of self compensation small current mutual inductor, is characterized in that: described power amplification circuit is made up of operational amplifier A 1 and power amplifier.
Described a kind of self compensation small current mutual inductor, is characterized in that: the output after operational amplifier A 2 is amplified of the voltage signal of described secondary coil.
Described a kind of self compensation small current mutual inductor, is characterized in that: in secondary side output circuit, be also provided with load R.
Described a kind of self compensation small current mutual inductor, is characterized in that: the iron core of described circuit mutual inductor adopts the ferromagnetic material with high initial magnetoconductivity.
More than show and described the design's ultimate principle, principal character and advantage.The technician of the industry should understand; the design is not restricted to the described embodiments; the principle that the design is just described of describing in above-described embodiment and instructions; do not departing under the prerequisite of the design's spirit and scope; the design also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the design.The claimed scope of the design is defined by appending claims and equivalent thereof.
Claims (6)
1. a self compensation small current mutual inductor, comprises primary winding and secondary coil, it is characterized in that: be also provided with the interpole coil of connecting with secondary coil in Current Transformer Secondary side, described interpole coil is connected with secondary coil through power amplification circuit.
2. a kind of self compensation small current mutual inductor as claimed in claim 1, is characterized in that: described power amplification circuit is made up of operational amplifier A 1 and power amplifier.
3. a kind of self compensation small current mutual inductor as claimed in claim 1, is characterized in that: the output after operational amplifier A 2 is amplified of the voltage signal of described secondary coil.
4. a kind of self compensation small current mutual inductor as claimed in claim 1, is characterized in that: in secondary side output circuit, be also provided with load R.
5. a kind of self compensation small current mutual inductor as claimed in claim 1, is characterized in that: the iron core of described circuit mutual inductor adopts the ferromagnetic material with high initial magnetoconductivity.
6. a kind of self compensation small current mutual inductor as claimed in claim 5, is characterized in that: described ferromagnetic material is permalloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420342501.3U CN204028194U (en) | 2014-06-26 | 2014-06-26 | A kind of self compensation small current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420342501.3U CN204028194U (en) | 2014-06-26 | 2014-06-26 | A kind of self compensation small current mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204028194U true CN204028194U (en) | 2014-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420342501.3U Expired - Fee Related CN204028194U (en) | 2014-06-26 | 2014-06-26 | A kind of self compensation small current mutual inductor |
Country Status (1)
| Country | Link |
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| CN (1) | CN204028194U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108107396A (en) * | 2017-08-01 | 2018-06-01 | 国网江西省电力公司电力科学研究院 | A kind of current transformer error detection device for compensating leakage current |
| CN108333458A (en) * | 2018-05-09 | 2018-07-27 | 国家电网公司 | A kind of device measuring Zinc-Oxide Arrester electric property |
-
2014
- 2014-06-26 CN CN201420342501.3U patent/CN204028194U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108107396A (en) * | 2017-08-01 | 2018-06-01 | 国网江西省电力公司电力科学研究院 | A kind of current transformer error detection device for compensating leakage current |
| CN108107396B (en) * | 2017-08-01 | 2024-06-04 | 国网江西省电力公司电力科学研究院 | Current transformer error detection device for compensating leakage current |
| CN108333458A (en) * | 2018-05-09 | 2018-07-27 | 国家电网公司 | A kind of device measuring Zinc-Oxide Arrester electric property |
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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: 20141217 Termination date: 20150626 |
|
| EXPY | Termination of patent right or utility model |