CN201478108U - Sampling coil of electronic current transformer - Google Patents
Sampling coil of electronic current transformer Download PDFInfo
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- CN201478108U CN201478108U CN2009203070354U CN200920307035U CN201478108U CN 201478108 U CN201478108 U CN 201478108U CN 2009203070354 U CN2009203070354 U CN 2009203070354U CN 200920307035 U CN200920307035 U CN 200920307035U CN 201478108 U CN201478108 U CN 201478108U
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Abstract
The utility model relates to a sampling coil of an electronic current transformer, which is applied to sensing heads in electronic current transformers for low current measurement. The sampling coil belongs to the technical field of measurement of electric power systems. The technical scheme includes that the sampling coil of the electronic current transformer is characterized by comprising a coil framework (1), a primary winding (2) and a secondary winding (3), the coil framework is annular, a groove is disposed on the coil framework, the primary winding is arranged inside the groove, the primary winding is fixed inside the groove through sealants, and the secondary winding is wound on the coil framework. The sampling coil has the advantages of substantially improving coefficient of mutual induction by adopting the technique to manufacture the coil, and strengthening the sensitivity of the coil, thereby being capable of accurately measuring low current within high voltage ranging from 0A to 5A, meeting national 0.2 level standard and enhancing anti-interference ability of the coil to outside.
Description
Technical field:
The utility model relates to a kind of sampling coil of electronic current mutual inductor, is used for the electronic current mutual inductor sensing head of small current measurement, belongs to the field of measuring technique of electric power system.
Background technology:
Rogowski (Luo Shi) coil is according to electromagnetic induction principle enamelled wire to be wrapped on the non magnetic skeleton of annular, allows bus current pass from frame center, and lead will induce and the proportional voltage signal of bus current like this.The Rogowski coil comes down to one group of conductor coils is wrapped on the non magnetic skeleton, owing to having distinct advantages such as certainty of measurement height, measuring range be wide, the Rogowski coil is widely used in current measurement, in recent years, the Rogowski coil is by each R﹠D institution's research both at home and abroad and be widely used in current measurement.Along with the further investigation of progress of science and technology and researcher, Rogowski coil miscellaneous is all developed, and its performance and precision also are greatly improved.But owing to the reason of loop construction and manufacture method in the past, the coefficient of mutual inductance of coil is very little, when the Rogowski coil is used to measure little electric current, the very faint and very difficult accurate measurement of its voltage signal that induces, the Preparation of Electronic-Optical Current Transformer based on the Rogowski coil that is used for small current measurement thus is acknowledged as a great problem of electric power system scientific research circle.
The utility model content:
The utility model purpose provides a kind of sampling coil of electronic current mutual inductor, improves coefficient of mutual inductance, and intensifier coil sensitivity solves the problems referred to above that exist in the background technology.
The technical solution of the utility model is: the sampling coil of electronic current mutual inductor comprises coil rack, elementary winding and secondary winding, coil rack is an annular, coil rack is provided with groove, elementary winding is arranged in the groove, by fluid sealant elementary winding is fixed in the groove, on coil rack, twines secondary winding.
In order to improve the coil anti-interference of electromagnetic field to external world, adopted " returning circle " technology, adding Michael Rawding paper between the layer of winding coiling and layer, and the screen of making of the metal adhesive tape is set at the outermost layer of coil.
Adopt epoxy phenolics to do coil rack, coil skeleton structure is made annular, and cross section is a rectangle; The elementary wire turn of coiling material adopts polyester copper coin enamelled wire, secondary employing is nonmagnetic polyurethane copper coin enamelled wire.In order to improve the coefficient of mutual inductance of coil, increase the size of coil rack, elementary winding is that multicircuit winding is arranged in the groove of coil rack, the secondary winding multilayer is arranged on the online ring framework.
The beneficial effects of the utility model are: owing to adopt this fabrication techniques coil can increase substantially coefficient of mutual inductance, coil sensitivity strengthens, thereby can accurately measure the interior little electric current of high pressure 0--5A scope, reach GB 0.2 grade standard, and improved coil antijamming capability to external world.
Description of drawings:
Accompanying drawing is the utility model example structure schematic diagram.
Among the figure: coil rack 1, elementary winding 2, secondary winding 3.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is described in further detail by embodiment.
In an embodiment, the sampling coil of electronic current mutual inductor comprises coil rack 1, elementary winding 2 and secondary winding 3, coil rack is an annular, coil rack is provided with groove, elementary winding is arranged in the groove, by fluid sealant elementary winding is fixed in the groove, on coil rack, twines secondary winding.
In the accompanying drawing 1, dotted line is the elementary coiling on the skeleton, and solid line is a secondary rolling thread, and the dotted circle in the middle of the skeleton is for returning circle.Adopt epoxy phenolics to do the skeleton of coil, determine the coefficient of mutual inductance of coil according to the relation between tested electric current and the induced potential, coil rack is made rectangle for the ease of processing with cross section, utilizes the mode of polishing to be made.Evenly carve six grooves that detour with laser behind the skeleton forming, so that wherein with elementary coiling coiling.Twine secondary rolling thread on this basis.On skeleton, twine the circle coiling conduct " return circle " opposite, so that drop to very low to the interference of useful signal to external magnetic field with the secondary rolling thread running direction.Twine two-layer secondary rolling thread then on this basis, ground floor want evenly close around, the second layer again uniform winding on ground floor, and between layer and layer, add Michael Rawding paper to reduce the external electromagnetic field interference.During actual coiling is the major defect that overcomes the Rogowski coil, is also noted that following problem:
(1) make every circle coil all unified as much as possible;
(2) make turn-to-turn apart from balanced as much as possible;
(3) carefully design the position of wire turn, so that obtain better compensation effect.
Claims (3)
1. the sampling coil of an electronic current mutual inductor, it is characterized in that comprising coil rack (1), elementary winding (2) and secondary winding (3), coil rack is an annular, coil rack is provided with groove, elementary winding is arranged in the groove, by fluid sealant elementary winding is fixed in the groove, on coil rack, twines secondary winding.
2. according to the sampling coil of the described electronic current mutual inductor of claim 1, it is characterized in that adding Michael Rawding paper between the layer of winding coiling and layer, at the outermost layer of coil the screen of making of the metal adhesive tape is set.
3. according to the sampling coil of the described electronic current mutual inductor of claim 1, it is characterized in that elementary winding is that multicircuit winding is arranged in the groove of coil rack, the secondary winding multilayer is arranged on the online ring framework.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203070354U CN201478108U (en) | 2009-07-29 | 2009-07-29 | Sampling coil of electronic current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203070354U CN201478108U (en) | 2009-07-29 | 2009-07-29 | Sampling coil of electronic current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201478108U true CN201478108U (en) | 2010-05-19 |
Family
ID=42414367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203070354U Expired - Fee Related CN201478108U (en) | 2009-07-29 | 2009-07-29 | Sampling coil of electronic current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201478108U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048509A (en) * | 2011-10-12 | 2013-04-17 | 施尼温特有限两合公司 | Current measuring coil for measuring current in conductor |
| CN104407192A (en) * | 2014-11-26 | 2015-03-11 | 国家电网公司 | Openable Rogowski coil assembly for measuring lightning current in power transmission line |
| CN111175558A (en) * | 2019-09-10 | 2020-05-19 | 上海嘉益电器设备有限公司 | Rogowski coil sensor and winding method thereof |
-
2009
- 2009-07-29 CN CN2009203070354U patent/CN201478108U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048509A (en) * | 2011-10-12 | 2013-04-17 | 施尼温特有限两合公司 | Current measuring coil for measuring current in conductor |
| CN104407192A (en) * | 2014-11-26 | 2015-03-11 | 国家电网公司 | Openable Rogowski coil assembly for measuring lightning current in power transmission line |
| CN111175558A (en) * | 2019-09-10 | 2020-05-19 | 上海嘉益电器设备有限公司 | Rogowski coil sensor and winding method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100519 Termination date: 20100729 |