CN2836202Y - PCB-based hollow coil current transformer - Google Patents
PCB-based hollow coil current transformer Download PDFInfo
- Publication number
- CN2836202Y CN2836202Y CNU2005200349697U CN200520034969U CN2836202Y CN 2836202 Y CN2836202 Y CN 2836202Y CN U2005200349697 U CNU2005200349697 U CN U2005200349697U CN 200520034969 U CN200520034969 U CN 200520034969U CN 2836202 Y CN2836202 Y CN 2836202Y
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- hollow coil
- coil
- circuit board
- printed circuit
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Abstract
The utility model belongs to the field of measurement and protection of an electric system, particularly a hollow coil current transformer based on a printed circuit board. The utility model utilizes a printed circuit board hollow coil to measure a bus current; besides, the utility model utilizes an analog-digital conversion A/D and signal processing unit to convert signals of a measuring coil to corresponding digital signals, and the digital signals are output. The printed circuit board hollow coil is achieved by using three layers of printed plates, and top layer conducting wires and bottom layer conducting wires of the printed plates are uniformly distributed along the circumference and connected into coils by through holes so as to ensure the equality of the cross section of each coil; a middle layer of the printed plates is used for arranging coil rewinding wires and reducing measurement error caused by environment temperature, the positions of a bus and the influence of external magnetic fields. Besides, a signal processing section uses digital integral taking a programmable logic device FPGA as a core to solve the defects of large measurement error and easy saturation because the traditional analog integral is influenced by the environment temperature and DC component.
Description
Technical field:
The utility model relates to a kind of printed circuit board current mutual inductor with hollow coil, and affiliated technical field is measurement and the protection field in the electric power system.
Background technology:
Existing power system electromagnetic current transducer is to be around in same iron core altogether by primary coil and secondary coil to constitute; former edge joint system high pressure; secondary output is as signal source and the required part power source of system's relaying protection; insulation system complexity, reliability are low; measuring range is limited; the magnetic saturation phenomenon is arranged, and can not directly be the microcomputer protective relay service of modern power systems.
Hollow coil is used for measuring because coil output voltage and power are all smaller, are difficult to directly drive the back level and measure and protection equipment in magnetic field at first, therefore can't directly apply to the electric power system current measurement for a long time.Along with the development of measuring technique, microelectric technique, the accurate measurement of small-signal has been become possibility, obtain fast development based on the electronic current mutual inductor of hollow coil, and will replace the conventional current instrument transformer.
The hollow coil that existing electronic current mutual inductor adopts generally is that flexible conductor (being generally enamelled wire) is wound on the skeleton of being made by non-magnetic material, coil coiled even level, and adopt the line that unrolls to eliminate the interference of external magnetic field.The certainty of measurement of hollow coil depends mainly on the coefficient of mutual inductance of coil, is that a stable constant must satisfy following 3 conditions and will make coefficient of mutual inductance: 1, every circle coil section equates; 2, the even coiling of coil; 3, coil section is long-pending vertical with center line.When adopting the conventional coil winding method to make hollow coil,, realize that above-mentioned 3 conditions are very difficult owing to the restriction that is subjected on the craft precision.Therefore, the hollow coil certainty of measurement that adopts conventional method to make is not high, can not satisfy the needs of power system measuring usually, also exists simultaneously because parameter dispersion problem manual or that semi-automatic making hollow coil causes.On the other hand, the analog integrator circuit that existing current mutual inductor with hollow coil adopts is subjected to the influence of ambient temperature and DC component, and it is saturated that integration takes place measure error more greatly, easily, and these have all limited current mutual inductor with hollow coil in application on power system.
The utility model content:
The purpose of this utility model provides the hollow coil of a kind of novel printed circuit board coil as electronic current mutual inductor, eliminate the error in the general hollow coil manufacturing process, make hollow coil be easy to industrial mass manufacture, and guarantee the consistency of performance of hollow coil industrial mass manufacture; The analog integration that adopts digital integration to solve existing current mutual inductor with hollow coil simultaneously is subjected to ambient temperature and DC component to influence big, the easy saturated deficiency of measure error.
Operation principle of the present utility model is: current bus bar passes hollow coil; hollow coil induce with current bus bar in electric current the voltage signal of fixed relationship is arranged; this voltage signal is delivered to the signal acquisition process unit and is converted to digital signal by fixing rule through the double layer screen twisted wire; digital signal is transferred to by Ethernet by digital interface and measures and microcomputer protection system, and on the spot by analog interface output analog signal.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of current mutual inductor with hollow coil based on printed circuit board (PCB) of the utility model is by the printed circuit board hollow coil, transmission double layer screen twisted wire, signal processing unit, composition such as digital interface and analog interface, the printed board substrate that it is characterized in that hollow coil is three layers of printed board structure, the top layer and the bottom of printed board evenly connect up, bottom lead and top layer lead are through the via hole formation coil that is connected, its coil turn is that 200 circles are to 300 circles, the printed board intermediate layer line that unrolls links to each other with top layer lead and hollow coil are terminal respectively, the intermediate layer line that unrolls is arranged in the intermediate layer of printed board, its position is the geometric center of coil section, and the hollow coil head end links to each other with the bottom lead.
Described printed circuit board hollow coil is made up of by hollow coil head end terminal a plurality of printed circuit board hollow coils and is connected with hollow coil end terminals first and last end.
The profile of described printed circuit board hollow coil is circle, rectangle or ellipse.
Described signal acquisition process unit is by the signal condition part, the A/D analog to digital converter, programmable logic device FPGA, D/A analog to digital converter, electrical to optical converter constitute, and according to signal flow to the printed circuit board (PCB) that adopts conducting wiring to be linked in sequence and to make.
The digital integration of described signal reduction is finished by programmable logic controller (PLC) FPGA.
The beneficial effects of the utility model are: the utility model has adopted the hollow coil of printed circuit board, processing is simple, be easy to industrial mass manufacture, the performance dispersiveness of having avoided craft or semi-hand coiling hollow coil to cause, can guarantee the hollow coil stable performance and the consistency of industrial mass manufacture, improve the certainty of measurement of instrument transformer greatly.Simultaneously, the utility model has adopted digital integration, has avoided the analog integration of existing current mutual inductor with hollow coil influenced by temperature and DC component, causes big, the easy saturated deficiency of measure error.
Description of drawings:
The utility model is described in further detail below in conjunction with accompanying drawing
Fig. 1 is the schematic diagram of the utility model printed circuit board current mutual inductor with hollow coil.
Fig. 2 is the hollow coil schematic diagram of the utility model printed circuit board current mutual inductor with hollow coil.
Fig. 3 is the exemplary embodiments schematic diagram of the utility model printed circuit board current mutual inductor with hollow coil.
Parts, position and numbering among the figure:
1 current bus bar, 2 printed circuit board (PCB) hollow coils, 3 double layer screen twisted wires
4 signal acquisition process unit, 5 analog interfaces, 6 digital interfaces
The terminal 9 printed board substrates of 7 hollow coil head ends, 8 hollow coils
Line unrolls in 10 bottom leads, 11 top layer leads, 12 intermediate layers
13 via holes, 14 coil stationary screws, 15 signal condition parts
16A/D analog to digital converter 17 programmable logic device FPGA 18D/A analog to digital converters
19 electricals to optical converter
Embodiment:
The utility model as shown in Figure 1, when high voltage bus (1) when flowing through electric current, induce the voltage signal that fixed relationship is arranged with this current signal in the measuring printed circuit board hollow coil (2), transmission double layer screen twisted wire (3) is transferred to signal acquisition process unit (4) with this signal and handles; Digital signal after treatment is transferred to the industry ethernet of electric power system by digital interface (5), and analog signal is exported by analog interface (6) simultaneously.
Hollow coil structure of the present utility model is as shown in Figure 2: printed board substrate (9) adopts three layers of printed board structure, the top layer and the bottom of printed board evenly connect up, bottom lead (10) dots with top layer lead (11) represents that with solid line the coil number of formation is 200～300 circles through via hole (13) the formation coil that is connected; Hollow coil head end (7) is connected with bottom lead (10), and the printed board intermediate layer line (12) that unrolls is represented to be connected with hollow coil end (8) with top layer lead (11) respectively with chain-dotted line; The printed board intermediate layer line (12) that unrolls is used to eliminate the interference of external magnetic field.
Most preferred embodiment of the present utility model is as shown in Figure 3: when flowing through electric current in the high voltage bus (1), printed circuit board hollow coil (2) induces the correspondent voltage signal; Hollow coil (2) is by four identical circuit board serial connections, each circuit board adopts the three ply board structure, and evenly connect up at the top layer and the bottom of circuit board, connect through via hole (13), form coil 240 circles, the intermediate layer of printed circuit board has arranged that wire body constitutes the intermediate layer line (12) that unrolls, and this intermediate layer line (12) that unrolls is positioned over the geometric center lines place of hollow coil around the cross section, eliminates external magnetic field and disturbs; The double layer screen twisted wire (3) that connects is the technical grade cable; Double layer screen twisted wire (3) is transferred to the measuring range that signal condition part (15) is carried out filtering and is amplified to A/D analog to digital converter (16) with this signal; The output signal of programmable logic controller (PLC) FPGA (17) control analog to digital converter (16) sampled signal conditioning part (15), and send among the programmable logic controller (PLC) FPGA (17) after being converted to digital signal; Digital integrating circuit in the programmable logic controller (PLC) FPGA carries out integration to the digital signal of input, and voltage signal is reduced into and the synchronous digital signal of high voltage bus (1) electric current; Programmable logic controller (PLC) FPGA (17) digital signal behind the integration is become light signal by electrical to optical converter (19) after the Optical Fiber Transmission that is connected with digital interface (6) to industry ethernet; Simultaneously also the signal behind programmable logic controller (PLC) FPGA (17) integration can be converted to analog signal through D/A digital to analog converter (18) is exported by analog interface (5).Signal condition chip (15), A/D analog to digital converter (16), programmable logic controller (PLC) FPGA (17), D/A digital to analog converter (18), electrical to optical converter (19), digital interface (6) is the technical grade general-purpose chip.
Claims (4)
1, a kind of based on the printed circuit board current mutual inductor with hollow coil, it is by printed circuit board hollow coil (2), transmission double layer screen twisted wire (3), signal processing unit (4), digital interface (5) and analog interface compositions such as (6), the printed board substrate (9) that it is characterized in that hollow coil (2) is three layers of printed board structure, the top layer and the bottom of printed board evenly connect up, bottom lead (10) and top layer lead (11) are through via hole (13) the formation coil that is connected, its coil turn is that 200 circles are to 300 circles, the printed board intermediate layer line (12) that unrolls links to each other with hollow coil end (8) with top layer lead (11) respectively, the intermediate layer line (12) that unrolls is arranged in the intermediate layer of printed board, its position is the geometric center of coil section, and hollow coil head end (7) links to each other with bottom lead (10).
2, printed circuit board current mutual inductor with hollow coil according to claim 1 is characterized in that printed circuit board hollow coil (2) is made up of by hollow coil head end (7) terminal a plurality of printed circuit board hollow coils to be connected with hollow coil end (8) terminal first and last end.
3, printed circuit board current mutual inductor with hollow coil according to claim 1 is characterized in that the profile of printed circuit board hollow coil (2) is circle, rectangle or ellipse.
4, according to claim 1, the board-like current mutual inductor with hollow coil of 2 described printed circuits, it is characterized in that signal acquisition process unit (4) is to be made of signal condition part (15), A/D analog to digital converter (16), programmable logic device FPGA (17), D/A analog to digital converter (18), electrical to optical converter (19), and according to signal flow to the printed circuit board (PCB) that adopts conducting wiring to be linked in sequence and to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200349697U CN2836202Y (en) | 2005-08-01 | 2005-08-01 | PCB-based hollow coil current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200349697U CN2836202Y (en) | 2005-08-01 | 2005-08-01 | PCB-based hollow coil current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2836202Y true CN2836202Y (en) | 2006-11-08 |
Family
ID=37300852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2005200349697U Expired - Fee Related CN2836202Y (en) | 2005-08-01 | 2005-08-01 | PCB-based hollow coil current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2836202Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474220A (en) * | 2013-09-13 | 2013-12-25 | 大连第一互感器有限责任公司 | Electronic transformer allowing error adjustment |
| CN105706194A (en) * | 2013-10-17 | 2016-06-22 | Abb股份公司 | Current transformer for low voltage residual current circuit breakers |
| CN106409489A (en) * | 2016-08-23 | 2017-02-15 | 珠海瑞捷电气股份有限公司 | Small digitized mutual inductor |
-
2005
- 2005-08-01 CN CNU2005200349697U patent/CN2836202Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474220A (en) * | 2013-09-13 | 2013-12-25 | 大连第一互感器有限责任公司 | Electronic transformer allowing error adjustment |
| CN105706194A (en) * | 2013-10-17 | 2016-06-22 | Abb股份公司 | Current transformer for low voltage residual current circuit breakers |
| CN106409489A (en) * | 2016-08-23 | 2017-02-15 | 珠海瑞捷电气股份有限公司 | Small digitized mutual inductor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |