CN105738674A - Current transformer - Google Patents
Current transformer Download PDFInfo
- Publication number
- CN105738674A CN105738674A CN201410768696.2A CN201410768696A CN105738674A CN 105738674 A CN105738674 A CN 105738674A CN 201410768696 A CN201410768696 A CN 201410768696A CN 105738674 A CN105738674 A CN 105738674A
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- China
- Prior art keywords
- current transformer
- sensing module
- optical fiber
- merging unit
- exchange box
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- 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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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses a current transformer. The current transformer comprises a sensing module 1 and a merging unit 2, the current transformer employs a non-magnetic framework 3, wherein the non-magnetic framework 3 is wound by a spiral wire 4, the spiral wire 4 is uniformly wound to form a Rogowski coil, the lower end of the non-magnetic framework 3 is connected with a fiber 6 through a far-end module 5, an outer end of the fiber 6 is wrapped in a zigzag-shaped composite insulator 7, the lower end of the fiber 6 is connected with an exchange box 8 and penetrates through the exchange box 8 to be directly connected with an optical cable 9, the right end of the optical cable 9 is connected with the sensing module 1, and the sensing module 1 is connected with the network secondary equipment through the merging unit 2. The current transformer is advantaged in that the current transformer has high measurement precision, is safe, realizes environmental protection and has no equipment combustion or explosion risks.
Description
【Technical field】
The present invention relates to a kind of transformer, particularly to the current transformer of a kind of electronic type.
[background technology]
The primary current of power system, primary voltage are measured by current transformer and voltage transformer, therefore, whether safe and reliable operation depends on that whether current transformer and voltage transformer are enough accurately with reliable in power system, visible, current transformer and voltage transformer are the visual plants in power system.Conventional current transformer is rather similar to transformator with the structure of voltage transformer, is based on electromagnetic induction principle.However, as the growth of electricity needs, the electric pressure of transformer station gradually steps up, and the shortcoming of old-fashioned electromagnetic type transformer also presents gradually, and therefore, current transformer starts to be manufactured.The insulating requirements of current transformer is simple, and structure is also uncomplicated, and its cost raises along with electric pressure unlike routine transformer and substantially strengthens, and then the electric pressure of power system is more high, and the advantage of applying electronic transformer is more big.Current transformer can be divided into power type and non-transformer formula two kinds.The optically-based sensing principle of power free current transformer, relies on magneto-optic effect (current transformer) and electrooptic effect (voltage transformer) to be designed respectively, and is made up of pure optics.Power free current transformer no longer contains electronic circuit, but power free current transformer is higher to the requirement of optical sensing material, and precision is easily subject to the impact of ambient temperature, external stress, and, the technological difficulties such as encapsulation of sensing head not yet solve at present.The difference is that, although having the current transformer of power supply after the development of significant period of time, but technology is still not mature enough.Therefore, at present for electronic type transformer study increase gradually.
【Summary of the invention】
Present invention is primarily targeted at, it is provided that one not only conforms to required precision, simultaneously safe and environment-friendly current sensor.
For achieving the above object, the technical scheme that the present invention takes is:
A kind of current transformer, including sensing module 1 and merging unit 2, the employing of described current transformer is non magnetic skeleton 3, and what described non magnetic skeleton 3 was wound around is helix 4, and described helix 4 is uniform winding, constitutes Luo-coil；Described non-magnetic modules skeleton 3 lower end connects optical fiber 6 by remote end module 5, and described optical fiber 6 outer end is enclosed with jagged composite insulator 7；The lower end of described optical fiber 6 is connected to exchange box 8, and through exchanging box 8 and being joined directly together with optical cable 9, what the right-hand member of described optical cable 9 connected is described sensing module 1, and described sensing module 1 is responsible for gathering voltage, electric current, and converts described voltage, electric current to digital signal；Described sensing module 1 is connected with network secondary device by merging unit 2, and described merging unit 2 is two sub-cells, measures and monitoring;Described exchange box 8 at least includes a ferromagnetic iron core, and connects loading resistor, by compensating the connection of electric current line in described exchange box.
In the present invention, described non magnetic skeleton is the coil of hollow.
In the present invention, described optical fiber 9 is internally provided with capacitance partial pressure equipment 10, and oils and fats or medium glue 11 are filled up in space.
In the present invention, in described sensing module 1, current trend is process 14 to data from PIN12 again to drive circuit 13, finally arrives laser instrument, and described data process and are directly connected to merge unit.
Compared with prior art, there is advantages that
(1) certainty of measurement is high: can meet measuring accuracy and protection application requirement simultaneously, be conducive to protection device, measure and control device, the integration of the Elementary Functions such as metering device.
(2) safety, economical environment-protective: current transformer takes up space little, convenient transport, and floor space is few, is easily installed, and reduces the generation of the open circuit phenomenon of secondary circuit, will not endanger the person and equipment safety because producing too high voltages.
(3) without equipment burning or risk of explosion: current transformer design is simple, it is not necessary to fill oil, without equipment burning or risk of explosion, fire will not be caused.
[accompanying drawing explanation]
Fig. 1 is the structural representation of the present invention；
Wherein, 1-sensing module 2-merges unit, the non magnetic skeleton of 3-, 4-helix, 5-remote end module, 6-connection optical fiber, 7-composite insulator, 8-exchange box, 9-optical cable, 10-capacitance partial pressure equipment, 11-oils and fats or medium glue, 12-PIN, 13-drive circuit, the process of 14-data.
【Detailed description of the invention】
For the technological means making the present invention realize, creation characteristic, reach purpose and effect and be easy to understand, below in conjunction with detailed description of the invention, the present invention is expanded on further.
As it is shown in figure 1, sensing module 1 and merging unit 2, the employing of described current transformer is non magnetic skeleton 3, and what described non magnetic skeleton 3 was wound around is helix 4, and described helix 4 is uniform winding, constitutes Luo-coil；Described non-magnetic modules skeleton 3 lower end connects optical fiber 6 by remote end module 5, and described optical fiber 6 outer end is enclosed with jagged composite insulator 7；The lower end of described optical fiber 6 is connected to exchange box 8, and through exchanging box 8 and being joined directly together with optical cable 9, what the right-hand member of described optical cable 9 connected is described sensing module 1, and described sensing module 1 is responsible for gathering voltage, electric current, and converts described voltage, electric current to digital signal；Described sensing module 1 is connected with network secondary device by merging unit 2, and described merging unit 2 is two sub-cells, measures and monitoring;Described exchange box 8 at least includes a ferromagnetic iron core, and connects loading resistor, by compensating the connection of electric current line in described exchange box.Wherein, described non magnetic skeleton is the coil of hollow.Described optical fiber 9 is internally provided with capacitance partial pressure equipment 10, and oils and fats or medium glue 11 are filled up in space.In described sensing module 1, current trend is process 14 to data from PIN12 again to drive circuit 13, finally arrives laser instrument, and described data process and are directly connected to merge unit.
Being wound into uniformly by helical on non magnetic skeleton, constitute Luo-coil, its output signal is the differential of tested electric current, and the linearity of output is fine.Sensing module and merging unit constitute the current transformer of power supply.Sensing module is arranged on high-pressure side, is responsible for gathering primary side voltage, electric current and converting thereof into digital signal;Merging unit is secondary device, and it is between current transformer and networking secondary device, it is possible to merges the signal that each phase remote end module transmits, and is transmitted to the use of other device.
The ultimate principle of the present invention is, current transformer eliminates the iron core within old-fashioned transformer, will not produce the saturation problem of transformer, without causing ferromagnetic resonance.Conclude, after putting into operation, current transformer transient response function admirable, improve power supply reliability.Additionally, fiber-optic transfer need not build substantial amounts of cable duct so that transformer station is compacter, reducing expropriation of land cost, and saved secondary device investment, these all significantly reduce the construction cost of transformer station
Meanwhile, the insulation system that the present invention adopts is very simple, owing to transmitting electric power by optical fiber, substantially increases sensing module simultaneously and merges the height of unit so that it is more suitable in the application of high pressure level.
The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described.Skilled person will appreciate that of the industry; the present invention is not restricted to the described embodiments; described in above-described embodiment and description is that principles of the invention is described; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements both fall within the claimed scope of the invention.Claimed scope is defined by appending claims and equivalent thereof 。
Claims (4)
1. a current transformer, including sensing module (1) and merging unit (2), it is characterized in that, the employing of described current transformer is non magnetic skeleton (3), the upper winding of described non magnetic skeleton (3) is helix (4), and described helix (4) is uniform winding, constitute Luo-coil；Described non-magnetic modules skeleton (3) lower end connects optical fiber (6) by remote end module (5), and described optical fiber (6) outer end is enclosed with jagged composite insulator (7)；The lower end of described optical fiber (6) is connected to exchange box (8), and through exchanging box (8) and being joined directly together with optical cable (9), what the right-hand member of described optical cable (9) connected is described sensing module (1), described sensing module (1) is responsible for gathering voltage, electric current, and converts described voltage, electric current to digital signal；Described sensing module (1) is connected with network secondary device by merging unit (2), and described merging unit (2) is two sub-cells, measures and monitoring;Described exchange box (8) at least includes a ferromagnetic iron core, and connects loading resistor, by compensating the connection of electric current line in described exchange box.
2. a kind of current transformer according to claim 1, it is characterised in that described non magnetic skeleton is the coil of hollow.
3. a kind of current transformer according to claim 1, it is characterised in that: described optical fiber (9) is internally provided with capacitance partial pressure equipment (10), and oils and fats or medium glue (11) are filled up in space.
4. a kind of current transformer according to claim 1, it is characterized in that, in described sensing module (1), current trend is from PIN(12) to drive circuit (13) again to data process (14), finally arrive laser instrument, and described data process and are directly connected to merge unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410768696.2A CN105738674A (en) | 2014-12-12 | 2014-12-12 | Current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410768696.2A CN105738674A (en) | 2014-12-12 | 2014-12-12 | Current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105738674A true CN105738674A (en) | 2016-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410768696.2A Pending CN105738674A (en) | 2014-12-12 | 2014-12-12 | Current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105738674A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597346A (en) * | 2016-12-08 | 2017-04-26 | 中国电力科学研究院 | Electronic current transformer laser energy supply self-diagnosis method and system thereof |
-
2014
- 2014-12-12 CN CN201410768696.2A patent/CN105738674A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597346A (en) * | 2016-12-08 | 2017-04-26 | 中国电力科学研究院 | Electronic current transformer laser energy supply self-diagnosis method and system thereof |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160706 |