CN101377979A - Electronic current transformer - Google Patents
Electronic current transformer Download PDFInfo
- Publication number
- CN101377979A CN101377979A CNA2007101317659A CN200710131765A CN101377979A CN 101377979 A CN101377979 A CN 101377979A CN A2007101317659 A CNA2007101317659 A CN A2007101317659A CN 200710131765 A CN200710131765 A CN 200710131765A CN 101377979 A CN101377979 A CN 101377979A
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- CN
- China
- Prior art keywords
- conductive body
- protection
- level winding
- coil
- transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000004804 winding Methods 0.000 claims abstract description 16
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 239000004020 conductor Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 3
- 230000005291 magnetic effect Effects 0.000 abstract description 4
- 238000002955 isolation Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000033772 system development Effects 0.000 description 1
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention relates to an electronic type voltage transformer device which consists of a first high voltage outlet terminal, a second measuring class winding, a first conductive body, and a second protection class winding, wherein, the second protection class winding uniformly winds a wire on a non-ferromagnetic ring-shaped skeleton by using the Rogowski coil principle, and the potential of the first conductive body, which is positioned between a coil and the conductive body, is arranged by an isolation method; then the wire passes through a second converter and outputs a rated second output voltage which conforms to the IEC60044-8: 2002 and GB/T20840 question mark 8 -2007 'Electronic Type Current Transformer' standard. The invention does not have the risk of a second high voltage open circuit of the traditional transformer, can not generate magnetic saturation and magnetic resonance phenomena, and has the advantages of small volume, light weight, low cost, and easy realization for the automation and digitization on measurement and protection.
Description
Technical field: the present invention relates to a kind of electronic current mutual inductor.
Technical background: therefore traditional electromagnetic transformer has limited power system development because volume and weight is big, cost is high, frequency band is narrow, be subjected to electromagnetic interference, output can not be with computer networking, can not realize intelligent control.
Summary of the invention: purpose of the present invention will provide a kind of electronic current mutual inductor exactly.It can overcome the existing above defective of traditional electromagnetic transformer well.The object of the present invention is achieved like this, a kind of electronic current mutual inductor mainly is made up of high-voltage terminal end, a secondary measurement level winding, primary conductive body, a second protection level winding, it is characterized in that: described second protection level winding adopt exactly Rogowski coil principle with lead equably on the non-ferromagnetic annular skeleton, it is that the method for isolating is provided with that Primary Conductor places the current potential between coil and the conductor; Lead is through secondary transducer, the rated secondary voltage of outputting standard then.The present invention does not have the danger of the second open circuit high pressure of traditional instrument transformer; Can not produce magnetic saturation and magnetic resonance phenomenon, especially under the environment of high voltage, big electric current; Adopt the Optical Fiber Transmission measurement result, have the good insulation performance performance, under the situation of high pressure, the big electric current of superhigh pressure, can satisfy the requirement of working under the hyperbaric environment; Measure bandwidth, dynamic range is big, makes the accuracy of measuring-signal and bandwidth that obvious improvement arranged, for fault current and the high order harmonic component of measuring and analyze the moment in the bulk power system provides possibility; Volume is little, in light weight, cheap, be easy to realize the automation and the digitlization of measuring and protecting.
Description of drawings: Fig. 1 is a conspectus of the present invention;
1. lead, 2. conductor, 3. non-ferromagnetic annular skeleton, 4. secondary transducer.
Embodiment: the invention will be further described below in conjunction with accompanying drawing;
In the drawings; a kind of electronic current mutual inductor mainly is made up of high-voltage terminal end, a secondary measurement level winding, Primary Conductor, a second protection level winding; it is characterized in that: described second protection level winding adopt exactly Rogowski coil principle with lead 1 equably on non-ferromagnetic annular skeleton 3; it is that the method for isolating is provided with that Primary Conductor 2 places the current potential between coil and the conductor 2; pass through secondary transducer 4 then, the rated secondary voltage of outputting standard.During concrete enforcement, adopt Rogowski coil principle be with lead equably on the non-ferromagnetic annular skeleton, one time bus places the current potential between coil and the bus to isolate; So owing to do not exist iron core not have saturated phenomenon; If bus current is I (t), according to Faraday's electromagnetic induction law, the induced potential e (t) that Rogowski coil two ends produce=-Mdi/dt, wherein M is a coefficient of mutual inductance; The induced potential e (t) that Rogowski coil two ends produce obtains and the proportional voltage signal of bus current after handling through integrator, pass through the processing, conversion of other link then after, can obtain and the proportional analog quantity output of primary current; Secondary is measured the level winding and is adopted the little ironcore choke of low energy consumption to be made; second protection level winding adopts Rogowski coil principle to be made; pass secondary with Primary Conductor then and measure level winding, second protection level winding; at the two ends of Primary Conductor the high-voltage terminal end is set respectively one time again, except that a high-voltage terminal end upper surface outer wrapping by epoxy resin mixed glue and pour into the electronic current mutual inductor that meets Rogowski coil principle.The present invention can be directly and instrument, protective relaying device interface, with connect under the intermediate switchgear cabinet supporting.Thereby realize the function of metering, control, measurement, protection.
Claims (1)
1. an electronic current mutual inductor is made up of high-voltage terminal end, a secondary measurement level winding, primary conductive body, a second protection level winding, it is characterized in that: described second protection level winding be adopt Rogowski coil principle with lead (1) equably on non-ferromagnetic annular skeleton (3), it is the method setting isolated that Primary Conductor (2) places current potential between coil and the conductor 2; Described lead (1) is provided with secondary transducer (4) at last.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101317659A CN101377979A (en) | 2007-08-29 | 2007-08-29 | Electronic current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101317659A CN101377979A (en) | 2007-08-29 | 2007-08-29 | Electronic current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101377979A true CN101377979A (en) | 2009-03-04 |
Family
ID=40421467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101317659A Pending CN101377979A (en) | 2007-08-29 | 2007-08-29 | Electronic current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101377979A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675433A (en) * | 2013-12-12 | 2014-03-26 | 国家电网公司 | Current sampling and protecting circuit for electronic current transformer |
| CN106199262A (en) * | 2016-07-04 | 2016-12-07 | 河南平高通用电气有限公司 | Coil pressure test device |
-
2007
- 2007-08-29 CN CNA2007101317659A patent/CN101377979A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675433A (en) * | 2013-12-12 | 2014-03-26 | 国家电网公司 | Current sampling and protecting circuit for electronic current transformer |
| CN106199262A (en) * | 2016-07-04 | 2016-12-07 | 河南平高通用电气有限公司 | Coil pressure test device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090304 |