CN202794296U - Polyphase photoelectric current transformer - Google Patents
Polyphase photoelectric current transformer Download PDFInfo
- Publication number
- CN202794296U CN202794296U CN 201220341485 CN201220341485U CN202794296U CN 202794296 U CN202794296 U CN 202794296U CN 201220341485 CN201220341485 CN 201220341485 CN 201220341485 U CN201220341485 U CN 201220341485U CN 202794296 U CN202794296 U CN 202794296U
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- circuit
- polyphase
- control
- optical fiber
- current transformer
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- Expired - Fee Related
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- Measurement Of Current Or Voltage (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
Provided is a polyphase photoelectric current transformer which comprises a plurality of high-voltage side circuits, a plurality of transmission optical fibers and a low-voltage side circuit. Each high-voltage side circuit comprises a current sampling component, a sampling control circuit, a photoelectric conversion circuit and a power supply circuit. The low-voltage side circuit comprises a DSP controller, a measurement control circuit, and a photoelectric decoding circuit. Each transmission optical fiber comprises a measuring optical fiber and a controlling fiber. According to the polyphase photoelectric current transformer, polyphase currents can be sampled simultaneously, current conversion needs no iron core, the saturation phenomenon will not occur, current wave distortion will not occur, measurement frequency is wide, and precision is high.
Description
Technical field
The utility model relates to the power system measuring field, is specially a kind of polyphase photo-electric current transformer.
Background technology
The effect of current transformer is to be converted to the less secondary current of numerical value to the larger primary current of numerical value by certain no-load voltage ratio, is used for protecting, the purposes such as measurement.In electric system, conventional current transformer is used to measure electric current the history in more than 100 year, but increasing along with the power capacity of electric system transmission, electric pressure is more and more higher, conventional current transformer unsurmountable problem occurs because of its principle, mainly be: (1) is because transformer iron core is saturated and the impact of magnetic hysteresis loop, the transient state output current of mutual inductor seriously distorts, and need to increase a large amount of protective relaying devices for overcoming this distortion; (2) saturated transient response speed and the precision that can reduce mutual inductor under the transformer iron core malfunction; (3) need the electric pressure of measurement higher, insulation technology requires more complicated, and cost is more and more higher.
Because the shortcoming that above-mentioned routine transformer exists, both at home and abroad just at the active research For The Rogowski Optical Current Transformer, this type of current transformer is comprised of high-pressure side circuit, Transmission Fibers and lower-voltage circuit, the high-pressure side data sampling adopts three-phase to control separately, each phase sampler control sequential is produced by the single-chip microcomputer on the every phase sampler plate in high-pressure side, and such structure can make error rates of data higher.And separately control of three-phase employing, asynchronous sampling for measuring the functions such as Three-phase Power Systems power, Power System Fault Record, high-voltage line fault location, the result of mistake all can occur.
The utility model content
The technical matters that the utility model solves is to provide a kind of polyphase photo-electric current transformer, to solve the shortcoming in the above-mentioned background technology.
The technical matters that the utility model solves realizes by the following technical solutions:
Polyphase photo-electric current transformer, by a plurality of high-pressure side circuit, a plurality of Transmission Fibers and a low pressure end the electric circuit constitute, described high-pressure side circuit is comprised of current sampling element, sampling control circuit, photoelectric switching circuit, power circuit, and described low pressure end circuit comprises dsp controller, circuit of measurement and control, photoelectrolysis decoding circuit; Described Transmission Fibers comprises a measuring optical fiber and a control optical fiber, described measuring optical fiber connects described photoelectric switching circuit output terminal and described photoelectrolysis decoding circuit input end, described control optical fiber connects described sampling control circuit input end and described circuit of measurement and control output terminal, and described photoelectrolysis decoding circuit output terminal and described circuit of measurement and control input end all are connected to described dsp controller.Described dsp controller also is connected with a GPS module and a 3G module.
Beneficial effect
The utility model can realize that polyphase current samples simultaneously, and current transformation does not have iron core, can not produce saturated phenomenon, and current waveform is undistorted, and survey frequency is wide, precision is high, has also reduced cost simultaneously.
Description of drawings
Fig. 1 is the theory diagram of polyphase photo-electric current transformer.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
Referring to Fig. 1, the theory diagram of polyphase photo-electric current transformer, polyphase photo-electric current transformer, by a plurality of high-pressure side circuit 1, a plurality of Transmission Fibers 2 and a low pressure end circuit 3 form, described high-pressure side circuit 1 is comprised of current sampling element 4, sampling control circuit 5, photoelectric switching circuit 6, power circuit 7, and described low pressure end circuit 3 comprises dsp controller 8, circuit of measurement and control 9, photoelectrolysis decoding circuit 10; Described Transmission Fibers 2 comprises a measuring optical fiber 11 and a control optical fiber 12, described measuring optical fiber 11 connects described photoelectric switching circuit 6 output terminals and described photoelectrolysis decoding circuit 10 input ends, described control optical fiber 12 connects described sampling control circuit 5 input ends and described circuit of measurement and control 9 output terminals, and described photoelectrolysis decoding circuit 10 output terminals and described circuit of measurement and control 9 input ends all are connected to described dsp controller 8.Described dsp controller 8 also is connected with a GPS module 13 and a 3G module 14.
More than show and described ultimate principle of the present utility model and principal character and advantage of the present utility model; the technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and the instructions just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications; these changes and improvements all fall in claimed the utility model scope, and the claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (2)
1. polyphase photo-electric current transformer, by a plurality of high-pressure side circuit, a plurality of Transmission Fibers and a low pressure end the electric circuit constitute, described high-pressure side circuit is by the current sampling element, sampling control circuit, photoelectric switching circuit, power circuit forms, described low pressure end circuit comprises dsp controller, circuit of measurement and control, the photoelectrolysis decoding circuit, it is characterized in that, described Transmission Fibers comprises a measuring optical fiber and a control optical fiber, described measuring optical fiber connects described photoelectric switching circuit output terminal and described photoelectrolysis decoding circuit input end, described control optical fiber connects described sampling control circuit input end and described circuit of measurement and control output terminal, and described photoelectrolysis decoding circuit output terminal and described circuit of measurement and control input end all are connected to described dsp controller.
2. polyphase photo-electric current transformer according to claim 1 is characterized in that, described dsp controller also is connected with a GPS module and a 3G module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220341485 CN202794296U (en) | 2012-07-16 | 2012-07-16 | Polyphase photoelectric current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220341485 CN202794296U (en) | 2012-07-16 | 2012-07-16 | Polyphase photoelectric current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202794296U true CN202794296U (en) | 2013-03-13 |
Family
ID=47821538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220341485 Expired - Fee Related CN202794296U (en) | 2012-07-16 | 2012-07-16 | Polyphase photoelectric current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202794296U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016080556A1 (en) * | 2014-11-18 | 2016-05-26 | RI, Myong Ju | Suspension electronic current transformer |
-
2012
- 2012-07-16 CN CN 201220341485 patent/CN202794296U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016080556A1 (en) * | 2014-11-18 | 2016-05-26 | RI, Myong Ju | Suspension electronic current transformer |
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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: 20130313 Termination date: 20150716 |
|
| EXPY | Termination of patent right or utility model |