CN201601017U - Current transformer - Google Patents
Current transformer Download PDFInfo
- Publication number
- CN201601017U CN201601017U CN2009202829502U CN200920282950U CN201601017U CN 201601017 U CN201601017 U CN 201601017U CN 2009202829502 U CN2009202829502 U CN 2009202829502U CN 200920282950 U CN200920282950 U CN 200920282950U CN 201601017 U CN201601017 U CN 201601017U
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- Prior art keywords
- coil
- current
- amplifier
- sampling
- current transformer
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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.)
- Expired - Fee Related
Links
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000005070 sampling Methods 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 6
- 239000003381 stabilizer Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract description 13
- 239000007769 metal material Substances 0.000 abstract description 2
- 238000005381 potential energy Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model discloses a current transformer and relates to a power transmission line current detection device. The current transformer comprises a shell and a coil arranged in the shell, wherein the coil comprises a coil 1 used for energy supply and provided with a magnetic frame, a coil 2 used for sampling and provided with a non-magnetic frame, and a current detection circuit; the current detection circuit comprises an amplifier and a current numerical value indicator gauge; the coil 2 is connected with the amplifier and provides sampling current data for the amplifier; the coil 1 is connected with the amplifier and the current numerical value indicator gauge and provides energy for the amplifier and the current numerical value indicator gauge; and the coil 1 and the coil 2 are concentrically arranged in the shell. The current transformer adopts the coil 2 wound by the non-magnetic frame for sampling, collects the weak voltage drop generated in the lead of the sampling coil by utilizing the electric potential energy difference in different magnetic field intensity, and generates larger electric energy by utilizing the coil 1 with a small magnetic frame, and the electric energy is provided for the current detection circuit. The current transformer can save a great amount of metal material resource.
Description
Technical field
The utility model relates to a kind of power transmission line current sensing means, relates in particular to a kind of current sensing means that is similar to instrument transformer.
Background technology
The domestic current transformer that adopts all is to adopt the A/A conversion regime at present, that is to say the mode that the primary current dress is changed to 0-5A.This mode has had the history of last 100 years, and the existing problem of this kind current transformer is: 1, power consumption is big; 2, the steel of Hao Yonging, copper material are many; 3, the no-load voltage ratio relation is arranged; 4, can not open-circuit working; 5, overload is fragile.
Especially preceding 2 points, at present, power consumer is more and more, causes the use amount of instrument transformer very big, and what no-load voltage ratio present instrument transformer need, and could take out metering signal, that is to say, at each user side, also needs to reuse two-stage instrument transformer at least.Leads such as used copper material, silicon steel sheet in each instrument transformer, magnetic material are a lot, and these materials, cost is big on the one hand, on the other hand can consumed power.
The utility model content
The utility model provides a kind of and has guaranteed to realize under the prerequisite of instrument transformer function the current transformer that the metal material utilization is few at above problem.
The technical solution of the utility model is: comprise housing, be arranged on the coil in the housing, described coil comprises the coil with magnetic skeleton one that is used for energy supply, coil with non magnetic skeleton two and the current detection circuit that is used to take a sample; Described current detection circuit comprises amplifier and current values display list; Described coil two connects amplifier, provides the sampling current data to amplifier; Described coil one connects amplifier and current values display list, gives amplifier and the energy supply of current values display list; Described coil one and coil two are arranged in the housing with one heart.
Described coil one links to each other with the current values display list with amplifier by an energy supply circuit, and described energy supply circuit comprises bridge rectifier, capacitor and voltage-stabiliser tube, and described capacitor and voltage-stabiliser tube also connect.
The utility model has adopted another kind of mode that the electric current in the interchange lead of electric power transfer is detected; Adopt one to use the coil two of non magnetic skeleton coiling to take a sample, utilize the energy of position under different magnetic field intensity poor, be captured in the weak voltage that produces in the lead of sample coil and fall; Utilize a coil one with very little magnetic skeleton to produce bigger electric energy again, be used to offer current detection circuit.Current detection circuit receives faint voltage drop signal, and amplifies this signal, and is final by showing on the current values display list of mA level, by methods such as dial plate conversions, draws the current value in the tested lead again.Conversion scale can be good in the budget of when design, also can survey the ratio that draws conversion by one or many.Current transformer need not to add working power.
Operation principle of the present utility model is: when the current transformer primary side passed through electric current, the Current Transformer Secondary side induced ac voltage.Linear relationship rising big or small in direct ratio when magnitude of voltage and primary current.Because coil winding can not produce the magnetic saturation phenomenon on a non-magnetic conduction skeleton, the non-constant width of all these instrument transformer ranges.The instrument transformer secondary voltage is very small to be amplified by electron-amplifier, converts digital signal output to by A/D again.
Description of drawings
Fig. 1 is the stereogram of Inside coil of the present utility model
1 is lead among the figure, the 2nd, and coil one, 21st, the output of coil one, the 3rd, coil two, 31st, the output of coil two;
Fig. 2 is that first kind of the utility model Inside coil is provided with form
Fig. 3 is that second kind of the utility model Inside coil is provided with form
Fig. 4 is a schematic diagram of getting the energy circuit in the utility model
Fig. 5 is the schematic diagram of sample circuit in the utility model
Fig. 6 be the utility model experiment test once, the secondary current relation table.
Embodiment
The utility model comprises housing, is arranged on the coil in the housing shown in Fig. 1-5, and described coil comprises the coil with magnetic skeleton 1 that is used for energy supply, coil with non magnetic skeleton 23 and the current detection circuit that is used to take a sample; Described current detection circuit comprises amplifier and current values display list; The output 31 of described coil 23 connects amplifier, provides the sampling current data to amplifier; The output 21 of described coil 1 connects amplifier and current values display list, gives amplifier and the energy supply of current values display list; Described coil 1 and coil 23 are arranged in the housing with one heart.
Described coil 1 links to each other with the current values display list with amplifier by an energy supply circuit, and described energy supply circuit comprises bridge rectifier, capacitor and voltage-stabiliser tube, and described capacitor and voltage-stabiliser tube also connect.
Wherein coil 1, coil 23 are provided with one heart, mutual interior external position relation shown in Fig. 2,3, whichever interior, that outside, all can realize the present invention.
The method of utilizing the utility model digital current instrument transformer to measure electric current in the ac transmission lead 1 is:
1), the employing spiral shell is responded to the ac transmission lead energies of position that magnetic field intensity difference forms on different circumference around the coil 23 on the non-magnetic skeleton, and this faint energy of position signal is transferred to sample circuit;
2), adopt spiral shell to gather the induced current of ac transmission lead around the coil 1 on the magnetic skeleton, and this electric current offered amplifier, processor, digital to analog converter, current values display list and analog to digital converter through rectification, filtering, as the work energy of amplifier, processor, digital to analog converter, current values display list and analog to digital converter;
3), the energy of position signal after amplifier amplifies, be transferred to analog to digital converter, be converted to digital signal; Be transferred to processor again, default conversion program in processor, the processor that is preset with the conversion program resolves digital signal, and is converted into current signal by digital to analog converter, is transferred to the electric current display list, shows the current value in the ac transmission lead.
Meaning of the present utility model is: 1, save copper material, steel in a large number, copper material only uses 30% of traditional instrument transformer copper material, and steel only use 40% of traditional instrument transformer; 2, physical quantity no distortion digital transmission, the long-distance transmissions of physical quantity.3, for realizing that digital transformer substation provides instrument transformer.
The utility model is implemented target: 1, electric pressure is 10kV and 400V; 2, current measurement signal converts to and gathers behind the voltage and carry out digital transmission; 3, can simulate output or numeral output; 4, good insulation preformance; 5, in light weight, have only about 1/2nd of traditional instrument transformer weight; 6, broad quantum can reach 0-1000A; 7, transmission is undistorted.
The explanation of experiment situation
The 10kV/400V current transformer of designing should be similar with the current transformer of original use on overall dimension, can directly substitute the existing current transformer that uses uses, and power consumption is little, guarantee long-time steady operation, signals collecting should guarantee that precision should be arranged, the signal transmission will guarantee undistorted, and signal output should be adopted the digital quantity output port, and transmission range can adapt to on-the-spot instructions for use.
Performance requirement
1, range 0-1000A
2. precision 1-0.5 level
3, operating voltage 3.3V
4, working temperature-25 ℃～+ 55 ℃
5, power consumption 50mW
6, digital quantity transmission, transmission range 4km
7, relative humidity＜93%
8, the withstand voltage 2000V of 400V instrument transformer
9, the withstand voltage 48kV of 10kV instrument transformer
10, can save copper material 70%, save steel 60%
11, overload capacity 200%
12, operation of current transformers safety is not afraid of open circuit and short circuit.
Experimental result as shown in Figure 6.
Claims (2)
1. current transformer comprises housing, is arranged on the coil in the housing, it is characterized in that described coil comprises the coil with magnetic skeleton one that is used for energy supply, coil with non magnetic skeleton two and the current detection circuit that is used to take a sample; Described current detection circuit comprises amplifier and current values display list; Described coil two connects amplifier, provides the sampling current data to amplifier; Described coil one connects amplifier and current values display list, gives amplifier and the energy supply of current values display list; Described coil one and coil two are arranged in the housing with one heart.
2. current transformer according to claim 1, it is characterized in that, described coil one links to each other with the current values display list with amplifier by an energy supply circuit, and described energy supply circuit comprises bridge rectifier, capacitor and voltage-stabiliser tube, and described capacitor and voltage-stabiliser tube also connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202829502U CN201601017U (en) | 2009-12-22 | 2009-12-22 | Current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202829502U CN201601017U (en) | 2009-12-22 | 2009-12-22 | Current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201601017U true CN201601017U (en) | 2010-10-06 |
Family
ID=42812080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202829502U Expired - Fee Related CN201601017U (en) | 2009-12-22 | 2009-12-22 | Current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201601017U (en) |
-
2009
- 2009-12-22 CN CN2009202829502U patent/CN201601017U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: YANGZHOU POWER SUPPLY CO., JIANGSU PROV ELECTRIC P Effective date: 20121113 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 225801 YANGZHOU, JIANGSU PROVINCE TO: 225800 YANGZHOU, JIANGSU PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20121113 Address after: 225800 members of the Baoying province Jiangsu County Road No. 288 Patentee after: Baoying County Power Supply Company of Jiangsu Electric Power Company Patentee after: Yangzhou Power Supply Company of Jiangsu Electric Power Company Patentee after: Jiangsu Electric Power Company Patentee after: State Grid Corporation of China Address before: 225801 members of the Baoying province Jiangsu County Road No. 288 Patentee before: Baoying County Power Supply Company of Jiangsu Electric Power Company |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101006 Termination date: 20171222 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |