CN102928641A - Electronic current transformer - Google Patents
Electronic current transformer Download PDFInfo
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- CN102928641A CN102928641A CN2012104313612A CN201210431361A CN102928641A CN 102928641 A CN102928641 A CN 102928641A CN 2012104313612 A CN2012104313612 A CN 2012104313612A CN 201210431361 A CN201210431361 A CN 201210431361A CN 102928641 A CN102928641 A CN 102928641A
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- conversion module
- mutual inductor
- light signal
- shunt
- optical signal
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Abstract
The invention discloses an electronic current transformer which comprises a shunt, a digital conversion module, an optical signal conversion module and a mutual inductor combining unit, wherein the digital conversion module is used for converting simulation signals into digital signals, and the optical signal conversion module is used for converting electrical signals into optical signals; two ends of the shunt are respectively connected with two input ends of the digital conversion module; and two output ends of the digital conversion module are connected with two input ends of the optical signal conversion module, and the optical signals output by the optical signal conversion module are input to the mutual inductor combining unit. The current transformer is good in linearity, real and reliable in transmission and conversion performance, free of wave distortion phenomenon, magnetic saturation phenomenon and trailing phenomenon, strong in anti-interference performance, wide in measuring range and capable of performing testing from several amperes to several kiloamperes.
Description
Technical field
The invention belongs to electric system current detection technology field, refer more particularly to a kind of electronic current mutual inductor.
Background technology
Current-voltage transformer is indispensable visual plant in the electric system, and its effect is in proportion the high voltage on the transmission line of electricity and large electric current to be dropped to the standard figures that can directly measure with instrument, in order to directly measure with instrument.Traditional electric power mutual-inductor (being CT, PT) is owing to self exist electrical insulation properties poor, and dynamic range is little, and the defectives such as saturated easily occur.The electronic current voltage mutual inductor that development in recent years is got up (being ECT, EPT) adopts novel sensing principle, can effectively overcome the defective of conventional electric power mutual inductor, for the safe operation of electric system, save cost, optimize secondary device solid foundation is provided.
Because electronic mutual inductor has many-sided advantage, have the history in more than 30 year abroad for the research of electronic mutual inductor, larger manpower and materials have been dropped into, constantly advance the development of electronic mutual inductor, and existing multiple prototype design out, but the overwhelming majority only limits to experiment or trial run stage.Although electronic mutual inductor has the advantage of the aspects such as insulation, in reliability. compare with traditional method for electromagnetically measuring aspect stability and the accuracy and also exist certain gap, have much room for improvement.Especially its important component part, since beginning one's study, there has been poor anti-interference in sensor Rogowski coil as primary current gathers both at home and abroad all the time, the problems such as poor stability are so that electronic mutual inductor is difficult to all the time spread and forms industrialization.This is also so that country " 12.Five " in the intelligent grid of plan, must be difficult to the all-round construction expansion by the Intelligent transformer station take electronic mutual inductor as the basis.
Summary of the invention
In order to solve above technical matters, the technical solution used in the present invention is as follows: electronic current mutual inductor comprises shunt, data-converting block, light signal modular converter and mutual inductor merge cells; Wherein:
It is digital signal that data-converting block is used for analog signal conversion, and the light signal modular converter is used for electric signal is converted to light signal;
The two ends of shunt connect two input ends of data-converting block; Two output terminals of data-converting block connect two input ends of light signal modular converter, and the light signal of light signal modular converter output is input to the mutual inductor merge cells.
Compared with prior art, beneficial effect of the present invention: traditional mutual inductor 20-30 that electric current is raised to ratings doubly after, magnetic flux unshakable in one's determination is near the zone of saturation, thereby cause the output waveform distortion, the aperiodic component of the secondary progress of disease is decayed in advance, and secondary output is with conditions of streaking behind the failure removal, the Luo Kefusi lubber ring year of in recent years up-to-date employing has been realized wide region, undersaturated current acquisition, but anti-interference type extreme difference affect the stability of operation of power networks and the authenticity that device gathers.And the current transformer linearity of the present invention is good, and measurement range is wide, magnetic saturation phenomenon and conditions of streaking can not occur; True waveform of the progress of disease can replace traditional electrical magnetic-type mutual inductor coil or Rogowski coil part fully.
Description of drawings
Fig. 1 is that tradition uses Luo-coil as the electronic mutual inductor that detects electric current;
Fig. 2 is electronic current mutual inductor of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail.
Fig. 1 is existing Luo-coil current transformer and using method.
Fig. 2 is electronic current transducer of the present invention and using method: electronic current mutual inductor, it is characterized in that, and comprise shunt, data-converting block, light signal modular converter and mutual inductor merge cells; Wherein:
It is digital signal that data-converting block is used for analog signal conversion, and the light signal modular converter is used for electric signal is converted to light signal; The two ends of shunt connect two input ends of data-converting block; Two output terminals of data-converting block connect two input ends of light signal modular converter, and the light signal of light signal modular converter output is input to the mutual inductor merge cells.Shunt directly is series at wire to be measured, and the outside also is provided with a cylindrical shape protective cover, and protective cover is connected with the ground base by insulator.
As previously mentioned, measure a very large alternating current, for example hundreds of ampere, even tens kiloamperes if measure with traditional electrical magnetic-type mutual inductor coil or Rogowski coil, can attract many insoluble on-the-spot problems, therefore adopts shunt here.Shunt is one can when electric current flows through shunt, one several millivolts-several volts will occur with interior voltage at its two ends by the milliohm level precision resistance of large electric current, comes the measure traverse line electric current with this.
The mutual inductor merge cells is electronic current mutual inductor technical field known technology, and merge cells is the middle device of connecting electronic formula mutual inductor secondary conversion portion and substation secondary device.Its digitizing and analog quantity interface merge data and process and in accordance with regulations form is issued secondary device, thereby realize the intelligent scheduling robotization after receiving the electric current and voltage data that current/voltage collector and other merge cellses transmit.
Claims (1)
1. electronic current mutual inductor is characterized in that, comprises shunt, data-converting block, light signal modular converter and mutual inductor merge cells; Wherein:
It is digital signal that data-converting block is used for analog signal conversion, and the light signal modular converter is used for electric signal is converted to light signal;
The two ends of shunt connect two input ends of data-converting block; Two output terminals of data-converting block connect two input ends of light signal modular converter, and the light signal of light signal modular converter output is input to the mutual inductor merge cells.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104313612A CN102928641A (en) | 2012-10-31 | 2012-10-31 | Electronic current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104313612A CN102928641A (en) | 2012-10-31 | 2012-10-31 | Electronic current transformer |
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| CN102928641A true CN102928641A (en) | 2013-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012104313612A Pending CN102928641A (en) | 2012-10-31 | 2012-10-31 | Electronic current transformer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346007A (en) * | 2013-07-26 | 2013-10-09 | 常州博瑞电力自动化设备有限公司 | Electronic current transformer of isolation circuit breaker |
| CN110895289A (en) * | 2018-09-12 | 2020-03-20 | 西安西电高压开关有限责任公司 | Current measuring device |
| CN112748274A (en) * | 2019-10-31 | 2021-05-04 | 西安西电高压开关有限责任公司 | Current measuring device |
| CN116243043A (en) * | 2023-02-07 | 2023-06-09 | 泰安市众诚自动化软件有限公司 | Explosion-proof type voltage current transformer of motor side |
Citations (6)
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| CN201017764Y (en) * | 2007-02-08 | 2008-02-06 | 北京国电四维电力技术有限公司 | Electronic high voltage current mutual inductor |
| CN101571556A (en) * | 2008-04-30 | 2009-11-04 | 上海新跃仪表厂 | Sagnac interferometer type all-fiber current transformator |
| CN201392731Y (en) * | 2009-03-12 | 2010-01-27 | 西安交通大学苏州研究院 | Photoelectric DC current transformer |
| CN201594465U (en) * | 2009-12-25 | 2010-09-29 | 中国西电电气股份有限公司 | Electronic high-voltage direct current transformer |
| CN101916648A (en) * | 2010-08-23 | 2010-12-15 | 山东电力研究院 | Digital type linear alternating voltage transformer of multi-frequency range measurement and measuring method thereof |
| CN202916326U (en) * | 2012-10-31 | 2013-05-01 | 南京江北自动化技术有限公司 | Electronic current transformer |
-
2012
- 2012-10-31 CN CN2012104313612A patent/CN102928641A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201017764Y (en) * | 2007-02-08 | 2008-02-06 | 北京国电四维电力技术有限公司 | Electronic high voltage current mutual inductor |
| CN101571556A (en) * | 2008-04-30 | 2009-11-04 | 上海新跃仪表厂 | Sagnac interferometer type all-fiber current transformator |
| CN201392731Y (en) * | 2009-03-12 | 2010-01-27 | 西安交通大学苏州研究院 | Photoelectric DC current transformer |
| CN201594465U (en) * | 2009-12-25 | 2010-09-29 | 中国西电电气股份有限公司 | Electronic high-voltage direct current transformer |
| CN101916648A (en) * | 2010-08-23 | 2010-12-15 | 山东电力研究院 | Digital type linear alternating voltage transformer of multi-frequency range measurement and measuring method thereof |
| CN202916326U (en) * | 2012-10-31 | 2013-05-01 | 南京江北自动化技术有限公司 | Electronic current transformer |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346007A (en) * | 2013-07-26 | 2013-10-09 | 常州博瑞电力自动化设备有限公司 | Electronic current transformer of isolation circuit breaker |
| CN110895289A (en) * | 2018-09-12 | 2020-03-20 | 西安西电高压开关有限责任公司 | Current measuring device |
| CN112748274A (en) * | 2019-10-31 | 2021-05-04 | 西安西电高压开关有限责任公司 | Current measuring device |
| CN112748274B (en) * | 2019-10-31 | 2023-05-16 | 西安西电高压开关有限责任公司 | Current measuring device |
| CN116243043A (en) * | 2023-02-07 | 2023-06-09 | 泰安市众诚自动化软件有限公司 | Explosion-proof type voltage current transformer of motor side |
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Application publication date: 20130213 |