CN201444565U - Electronic control device utilizing low-current mutual transducer to detect high current - Google Patents
Electronic control device utilizing low-current mutual transducer to detect high current Download PDFInfo
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- CN201444565U CN201444565U CN2009200100199U CN200920010019U CN201444565U CN 201444565 U CN201444565 U CN 201444565U CN 2009200100199 U CN2009200100199 U CN 2009200100199U CN 200920010019 U CN200920010019 U CN 200920010019U CN 201444565 U CN201444565 U CN 201444565U
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- current
- electronic control
- current mutual
- impedance
- mutual inductor
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Abstract
The utility model discloses an electronic control device suitable for utilizing a low-current mutual transducer to detect high current. The electronic control device utilizes the existing lower-current transducers such as a zero-sequence current transducer, a residual current transducer and the like to detect high current. A thin and short impedance wire is used for being connected with a loading conductor in parallel so as to play a role of shunting by proportion; and a high-sensitivity electronic control circuit is provided to output current signals and protective signals.
Description
Affiliated technical field
The utility model relates to a kind of electronic-controlled installation that is fit to detect with small current mutual inductor big electric current.
Background technology
Current, be used for the device of current detecting, all adopt following 2 kinds of forms:
1, at the load wire resistors in series,
2, press the dress current transformer in load wire.
Above-mentioned the 1st kind of structure is mainly used in low-voltage, the detection of little electric current.Have the power consumption heating, use unsafe deficiency.Above-mentioned the 2nd kind of structure is mainly used in high voltage, the detection of big electric current, and it is big to have a current transformer volume, the cost height, precision is low, the deficiency that sensitivity is low.
Summary of the invention
For solving the deficiency of said structure, a kind of electronic-controlled installation that is fit to detect with small current mutual inductor big electric current of the utility model design has the saving material, does not generate heat, and the current transformer volume is little, and cost is low, precision height, highly sensitive characteristics.
The technical scheme that its technical problem that solves the utility model adopts is: use small current mutual inductor to detect big electric current.As utilize existing zero sequence current mutual inductor, residual current transformer etc.The centre bore of impedance line from zero sequence current mutual inductor passed, the impedance line two ends keep at a certain distance away and the load wire of zero sequence current mutual inductor both sides connects, impedance line is one section lead with resistance R 1 or connection electrical resistance R1, if the resistance between 2 tie-points of load wire is R2, the electric current that impedance line flows through is I1, and the electric current that flows through on the load wire is I2, and then the pass of I1 and I2 is: I1=I2 * R2/R1, this shows R1 is than big what times of R2.Then I1 be exactly I2 what/one, be equipped with highly sensitive electronic control circuit, RV4145 for example, LM54123.Signal to current transformer output amplifies control circuit output current control signal.The beneficial effects of the utility model are: utilize existing zero sequence current mutual inductor, small current mutual inductors such as residual current transformer detect big electric current, very thin with a relative load wire, very short impedance line is connected in parallel on the load wire, play shunting action in proportion, have simple in structurely, save material, improve control accuracy, can be used for automation control.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is a kind of electrical schematic diagram of the present utility model.
Fig. 2 is a current transformer of the present utility model, impedance line, the structural representation that load wire is coupled to each other.
1. control coils among the figure, 2. current transformer, 3. integrated circuit, 4. impedance line, 5. load wire.
Embodiment
At first press Fig. 2 current transformer 2; impedance line 4; load wire 5 is coupled to each other; the output lead of current transformer 2 is welded on by on the good control circuit of Fig. 1 electrical schematic diagram erection welding; the signal of 3 pairs of current transformers 2 of integrated circuit amplifies, control coil 1 output corresponding protection signal.For example, the load wire maximum current is 100A, with the instrument transformer detection of 100mA, if the line length of load wire and two tie-points of impedance line is 100mm, sees Fig. 2, and R1/R2=I2/I1=10000 is 200mm as if the load wire sectional area so
2, load wire and impedance line are isometric, identical materials, and then the impedance line sectional area is 0.02mm
2, Here it is very thin very short impedance line.In each concrete scheme, a very thin very short impedance line has just had the notion of amount.
More than be a kind of embodiment of the present utility model; the utility model is not limited to the foregoing description; under the situation that does not deviate from the utility model spirit and essence thereof; the technical staff who is familiar with electronic technology can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong within the protection range of claim of the present invention.
Claims (3)
1. electronic-controlled installation that detects big electric current with small current mutual inductor; it is characterized in that: utilize existing zero sequence current mutual inductor; small current mutual inductors such as residual current transformer detect big electric current; very thin with one with respect to load wire; very short impedance line is connected in parallel on the load wire; play shunting action in proportion, be equipped with highly sensitive electronic control circuit, can the output protection signal.
2. root a tree name claim 1 is described detects the electronic-controlled installation of big electric current with small current mutual inductor, and it is characterized in that: described highly sensitive electronic control circuit adopts integrated circuit RV4145 and LM54123.
3. root a tree name claim 1 is described detects the electronic-controlled installation of big electric current with small current mutual inductor, and it is characterized in that: described impedance line is one section lead with impedance, also can be to connect the lead of impedance and impedance to lump together and be referred to as impedance line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200100199U CN201444565U (en) | 2009-01-05 | 2009-01-05 | Electronic control device utilizing low-current mutual transducer to detect high current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200100199U CN201444565U (en) | 2009-01-05 | 2009-01-05 | Electronic control device utilizing low-current mutual transducer to detect high current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201444565U true CN201444565U (en) | 2010-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200100199U Expired - Fee Related CN201444565U (en) | 2009-01-05 | 2009-01-05 | Electronic control device utilizing low-current mutual transducer to detect high current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201444565U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106855584A (en) * | 2016-12-09 | 2017-06-16 | 德阳市库伦电气有限公司 | A kind of method that use current transformer measures electric current |
| CN109655654A (en) * | 2019-01-16 | 2019-04-19 | 江苏其厚智能电气设备有限公司 | A kind of Super-Current Measurement method and device based on by-pass shunt technology |
-
2009
- 2009-01-05 CN CN2009200100199U patent/CN201444565U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106855584A (en) * | 2016-12-09 | 2017-06-16 | 德阳市库伦电气有限公司 | A kind of method that use current transformer measures electric current |
| CN109655654A (en) * | 2019-01-16 | 2019-04-19 | 江苏其厚智能电气设备有限公司 | A kind of Super-Current Measurement method and device based on by-pass shunt technology |
| CN109655654B (en) * | 2019-01-16 | 2023-10-20 | 江苏其厚智能电气设备有限公司 | High-current measurement method and device based on bypass shunt technology |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100428 Termination date: 20120105 |