CN201503769U - Embedded current transformer capable of resisting direct-current component - Google Patents
Embedded current transformer capable of resisting direct-current component Download PDFInfo
- Publication number
- CN201503769U CN201503769U CN2009201030935U CN200920103093U CN201503769U CN 201503769 U CN201503769 U CN 201503769U CN 2009201030935 U CN2009201030935 U CN 2009201030935U CN 200920103093 U CN200920103093 U CN 200920103093U CN 201503769 U CN201503769 U CN 201503769U
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- China
- Prior art keywords
- energy meter
- secondary coil
- wire
- copper
- 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 - Lifetime
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- Transformers For Measuring Instruments (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The utility model relates to a current transformer with a function of resisting direct current component in an electronic energy meter. An insulating shell of the embedded current transformer capable of resisting the direct current component is internally provided with a primary coil and a secondary coil; a copper primary leading wire passes through the primary coil by one turn; the end part of the copper primary leading wire is a sheet-shaped wiring terminal; the wiring terminal is provided with an installation hole which has consistent size and spacing with the energy meter; the secondary coil consists of a ring-shaped iron core and a varnished wire that enwound the external surface thereof; a secondary output leading wire of the secondary coil is connected with a current measuring circuit of the energy meter; and the copper primary leading wire and the secondary coil are integrally encapsulated in the insulating shell by an epoxy resin. The current transformer has the same high alternating current measuring accuracy with the normal alternating current transformer, and can control the influence of the direct current component and even harmonics in the alternating current circuits on the energy meter within standard requirements.
Description
Technical field
The utility model relates to the current transformer with anti-DC component function in a kind of electric energy meter parts, the especially electronic electric energy meter.
Background technology
The ripe current measurement mode of using always in the electronic electric energy meter at present is based on the common AC current transformer of electromagnetic induction principle, under normal circumstances be sinusoidal ac in the electrical network loop, this moment, common AC current transformer can realize accurate metering preferably; But development along with power electronic technology, applying also of various Switching Power Supplies brought interference and pollution to electrical network, make the simple alternating current waveform that distortion take place and contain in various degree DC component, this moment, the measure error of common AC current transformer can increase rapidly, it is big to cause the electric energy meter error in dipping to increase, also clearly stipulated the test request of DC component and the even-order harmonic amount of influence in the alternating current circuit in GB/T 17215-2002 " 1 grade exchange active electric energy meter with the 2 grades of state types " standard, common AC current transformer can not meet the demands.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of current transformer with anti-DC component function, this instrument transformer can also make DC component and even-order harmonic in the alternating current circuit that the amount of influence of electric energy meter is controlled in the standard-required when having high AC measurment accuracy.
The utility model adopts following technical scheme:
The utility model is provided with primary coil and secondary coil in the insulation crust of the anti-DC component instrument transformer of loading type, primary coil adopts the elementary lead-in wire of copper to wear a circle, the elementary lead-in wire of copper end is the sheet binding post, binding post is provided with size and the spacing installing hole consistent with energy meter terminal, secondary coil is formed by annular core with around the enamelled wire of its outside, the secondary output lead of secondary coil connects electrical energy meter electricity flowmeter amount circuit, for the electric energy meter chip provides current signal; The elementary lead-in wire of copper outside is with the insulating sleeve with the secondary wire turn turn insulation, and the elementary lead-in wire of copper, secondary coil are encapsulated in the insulation crust by the epoxy resin one.
The used annular core of the utility model is iron based nano crystal material and the compound iron core of Fe-based amorphous material.
The beneficial effects of the utility model are as follows:
The utility model not only has the very high ac current measurement accuracy of common AC current transformer, and DC component and even-order harmonic in the alternating current circuit are controlled in the standard-required the amount of influence of electric energy meter.
The elementary lead-in wire of copper of the present utility model end is the sheet binding post, good conductivity, and the intensity height except that making current lead-through, can also play the effect that installs and fixes instrument transformer.
The experiment proved that, 5 (40) the A electronic electric energy meters that the anti-DC component current transformer that utilizes the utility model to provide is made, it exchanges sum of errors dc error precision and all meets the demands, and 5 (40) the A electric energy meter error test datas that concrete experiment records are as follows:
Above-mentioned experimental data shows that the electronic electric energy meter that the anti-DC component current transformer that utilizes the utility model to provide is made can satisfy the interchange sum of errors dc error required precision of 1 grade of electric energy meter fully.
Description of drawings
Accompanying drawing 1 is a structural representation of the present utility model;
Accompanying drawing 2 is looked the surface structure schematic diagram for the right side of the present utility model;
Accompanying drawing 3 is the utility model principle schematic.
In the accompanying drawings: 1 level output lead, the anti-DC component instrument transformer of 2 loading types, the elementary lead-in wire of 3 bronze medals, 4 secondary coils, 5 insulation crusts.
Embodiment
The utility model utilizes electromagnetic induction principle, on annular core, be wound with primary coil and secondary coil respectively, primary coil adopts the elementary lead-in wire of copper to wear a circle, the elementary lead-in wire of copper end is the sheet binding post, the configuration of the primary and secondary coil ratio by instrument transformer, electric current that will be bigger accurately are transformed into the little electric current of milliampere level that can directly measure with instrument.Used annular core is new iron-based nanocrystalline material and the compound iron core of Fe-based amorphous material.
The utility model is the loading type structure, is provided with secondary coil and elementary lead-in wire in insulation shell, sets as one by the epoxy resin envelope.
Zinc-plated or the Nickel Plating Treatment of the elementary wire surface of copper of the present utility model, the binding post of elementary lead-in wire is connected with energy meter terminal.
The utility model has standard installation hole on the binding post of elementary lead-in wire, supporting with the energy meter terminal installation dimension.
The utility model secondary coil is output as the lead-in wire lead-out mode, and secondary output lead connects electrical energy meter electricity flowmeter amount loop.
Accompanying drawing 1,2,3 is an embodiment of the present utility model, shown in accompanying drawing 1,2,3, in the insulation crust 5 of the anti-DC component instrument transformer 2 of the utility model loading type, be provided with primary coil and secondary coil 4, primary coil adopts the elementary lead-in wire 3 of copper to wear a circle, the elementary lead-in wire of copper 3 ends are the sheet binding post, have standard installation hole on the binding post, and the size of installing hole is consistent with energy meter terminal with spacing; Secondary coil 4 is formed by annular core with around the enamelled wire of its outside, and the annular core that is adopted is new iron-based nanocrystalline material and the compound iron core of Fe-based amorphous material; The secondary output lead 1 of secondary coil 4 connects electrical energy meter electricity flowmeter amount circuit, for the electric energy meter chip provides current signal; Elementary lead-in wire 3 electroplating surfaces with tin of copper or Nickel Plating Treatment, good conductivity, anticorrosion, the elementary lead-in wire of copper 3 outsides are with insulating sleeve, and 4 insulation of assurance and secondary coil are good; By epoxy resin the elementary lead-in wire 3 of copper, secondary coil 4 one are encapsulated in the insulation crust 5 during production, insulation effect is good, moistureproof antidetonation.
Claims (1)
1. anti-DC component current transformer of loading type, it is characterized in that in the insulation crust (5) of the anti-DC component instrument transformer of loading type (2), being provided with primary coil and secondary coil (4), primary coil adopts the elementary lead-in wire of copper (3) to wear a circle, the elementary lead-in wire of copper (3) end is the sheet binding post, binding post is provided with size and the spacing installing hole consistent with energy meter terminal, secondary coil (4) is formed by annular core with around the enamelled wire of its outside, the secondary output lead (1) of secondary coil (4) connects electrical energy meter electricity flowmeter amount circuit, for the electric energy meter chip provides current signal; The elementary lead-in wire of copper (3) outside be with secondary coil (4) between the insulating sleeve that insulate, the elementary lead-in wire of copper (3), secondary coil (4) are encapsulated in the insulation crust (5) by the epoxy resin one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201030935U CN201503769U (en) | 2009-06-03 | 2009-06-03 | Embedded current transformer capable of resisting direct-current component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201030935U CN201503769U (en) | 2009-06-03 | 2009-06-03 | Embedded current transformer capable of resisting direct-current component |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201503769U true CN201503769U (en) | 2010-06-09 |
Family
ID=42454698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201030935U Expired - Lifetime CN201503769U (en) | 2009-06-03 | 2009-06-03 | Embedded current transformer capable of resisting direct-current component |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201503769U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104157421A (en) * | 2014-04-30 | 2014-11-19 | 广州金升阳科技有限公司 | Plastic-package transformer and manufacturing process thereof and special lead frame |
-
2009
- 2009-06-03 CN CN2009201030935U patent/CN201503769U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104157421A (en) * | 2014-04-30 | 2014-11-19 | 广州金升阳科技有限公司 | Plastic-package transformer and manufacturing process thereof and special lead frame |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100609 |
|
| CX01 | Expiry of patent term |