CN202796419U - Current transformer for accurately measuring linearity of small current and unsaturation degree of large current - Google Patents
Current transformer for accurately measuring linearity of small current and unsaturation degree of large current Download PDFInfo
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- CN202796419U CN202796419U CN201220462534.2U CN201220462534U CN202796419U CN 202796419 U CN202796419 U CN 202796419U CN 201220462534 U CN201220462534 U CN 201220462534U CN 202796419 U CN202796419 U CN 202796419U
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Abstract
The utility mode discloses a current transformer for accurately measuring linearity of small current and unsaturation degree of large current. The current transformer is characterized by being ring-shaped, and comprising a secondary coupling coil, a magnetic core and a tight sealing shell. The magnetic core is arranged in the tight sealing shell, and the secondary coupling coil is also arranged in the tight sealing shell. According to the current transformer for accurately measuring linearity of small current and unsaturation degree of large current, in measures for balancing, the characteristics of high magnetic induction intensity and high superposition coefficient of a silicon steel sheet are used, in combination with thickening the diameter of a varnished wire as much as possible under allowance and increasing the section area of the superposition as much as possible under the limitation on space and weight of the current transformer, the aim of guaranteeing good linearity while measuring the small current is realized, and the current transformer is prevented from generating saturation phenomenon when being used as fault wave recording large current.
Description
Technical field
The utility model relates to a kind of current transformer, relates in particular to the current transformer of the little electric current linearity of a kind of accurate measurement and large electric current degree of unsaturation.
Background technology
Current transformer is the foremost Coupling device as the monitoring of power cable current status, present current transformer is because the core material selection of using is improper, perhaps the parameter of selection is improper, it is improper that the wire diameter of enamelled wire is selected, cause current transformer can only realize a kind of application, can not adapt to the application that the current range span is wider and requirement is stricter.
The utility model content
The purpose of this utility model is exactly in order to address the above problem, and provides the current transformer of the little electric current linearity of a kind of accurate measurement and large electric current degree of unsaturation, the advantage of large electric current degree of unsaturation when the linearity when it has the little electric current of accurate measurement and failure wave-recording.
To achieve these goals, the utility model adopts following technical scheme:
The current transformer of the little electric current linearity of a kind of accurate measurement and large electric current degree of unsaturation, it is circular ring type, and it comprises secondary coupling coil, magnetic core and fit sealing shell, wherein, in the fit sealing shell, be provided with magnetic core, in the fit sealing shell, also be provided with secondary coupling coil.
Secondary coupling coil is at the opening diameter 25mm～70mm of magnet ring.
Described magnetic core adopts some silicon steel sheet closed assembly designs, silicon steel sheet realizes obtaining under the same magnetic field higher magnetic strength, magnetic core adopts the design of silicon steel sheet thin slice, silicon steel sheet smooth surface, smooth and even thickness, the pile pieces coefficient of making iron core is high, so during closed assembly between sheet the gap very little, be equivalent to increase the magnetic core sectional area by closed assembly; Simultaneously, in the situation of instrument transformer weight and spatial volume permission, increase the silicon steel sheet sectional area as far as possible, can both prevent that like this saturated phenomenon from appearring in current transformer when being used as the large electric current of failure wave-recording.The thickness of described silicon steel sheet thin slice is 0.23mm～0.35mm.
Described current transformer, according to measuring current range, the used enamelled wire of secondary coupling coil has a minimum wire diameter requirement, satisfying under the condition of this requirement, in the situation of current mutual inductor coiling space permission, improve the wire diameter of enamelled wire as far as possible, on the one hand, by the overstriking of wire diameter, the enamelled wire internal resistance is reduced, when measuring little electric current, can guarantee that the linearity is good like this, improve the accuracy of measuring little electric current, on the other hand, after the overstriking of enamelled wire wire diameter, the electric current that can bear increases, and can prevent that saturated phenomenon, the wire diameter 0.5mm of the enamelled wire of described secondary coupling coil～1.0mm from appearring in current transformer when being used as the large electric current of failure wave-recording.
The beneficial effects of the utility model: accurately measure the little electric current linearity and large current recording unsaturated current transformer and take into account measure and utilize the higher magnetic flux density of silicon steel sheet itself, and the high characteristics of stack coefficient, in conjunction with the as far as possible overstriking in situation about allowing of enamelled wire wire diameter, and in the situation of instrument transformer space and weight permission, improve the closed assembly sectional area as far as possible, can guarantee that the linearity is good when having reached the little electric current of measurement, prevent that simultaneously saturated phenomenon from appearring in current transformer when being used as the large electric current of failure wave-recording.
Description of drawings
Fig. 1 is profile of the present utility model;
Fig. 2 is profile of the present utility model.
Wherein, 1. magnetic core, 2. fit sealing shell, 3. time level coupling coil, 4. the A part of current transformer, 5. the B part of current transformer.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.
Such as Fig. 1, accurately measure the little electric current linearity and large current recording unsaturated current transformer is comprised of current transformer A part 4 summation current transformer B parts 5, by the hold-down screw that designs and the closure of fit sealing shell 2 realization current transformers.In this design, the opening diameter of magnet ring is 55mm, satisfies the desired opening diameter of field failure record ripple.
Wherein, magnetic core 1 adopts the design of silicon steel sheet closed assembly, in the accurate measurement of the fault current of 0～3KA and failure wave-recording design, adopts every layer of silicon steel sheet 0.23mm, and 52 stacked dresses reach magnetic core sectional area 1.4mm
2, it is unsaturated to satisfy when the highest 3KA electric current instrument transformer.
Above-mentioned just for a kind of design in the highest 3KA failure wave-recording of the primary current case study on implementation, for different failure wave-recording requirements, can change the opening diameter of current transformer, the thickness of silicon steel sheet, the stack number of plies, and the enamelled wire wire diameter of secondary coupling coil, with the linearity and the accuracy of better guarantee small current measurement, and the degree of unsaturation in fault current when monitoring.
Although above-mentionedly by reference to the accompanying drawings embodiment of the present utility model is described; but be not the restriction to the utility model protection range; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection range of the present utility model.
Claims (5)
1. the current transformer of the little electric current linearity of accurate measurement and large electric current degree of unsaturation is characterized in that it is circular ring type, it comprises secondary coupling coil, magnetic core and fit sealing shell, wherein, in the fit sealing shell, be provided with magnetic core, in the fit sealing shell, also be provided with secondary coupling coil.
2. the current transformer of the little electric current linearity of accurate measurement as claimed in claim 1 and large electric current degree of unsaturation is characterized in that described magnetic core adopts some silicon steel sheet thin slice closed assemblies, silicon steel sheet smooth surface, smooth and even thickness.
3. the current transformer of the little electric current linearity of accurate measurement as claimed in claim 1 and large electric current degree of unsaturation is characterized in that the wire diameter 0.5mm of the enamelled wire of described secondary coupling coil～1.0mm.
4. the current transformer of the little electric current linearity of accurate measurement as claimed in claim 1 and large electric current degree of unsaturation is characterized in that the thickness of described silicon steel sheet thin slice is 0.23mm～0.35mm.
5. the current transformer of the little electric current linearity of accurate measurement as claimed in claim 1 and large electric current degree of unsaturation is characterized in that secondary coupling coil is at the opening diameter 25mm～70mm of magnet ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220462534.2U CN202796419U (en) | 2012-09-12 | 2012-09-12 | Current transformer for accurately measuring linearity of small current and unsaturation degree of large current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220462534.2U CN202796419U (en) | 2012-09-12 | 2012-09-12 | Current transformer for accurately measuring linearity of small current and unsaturation degree of large current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202796419U true CN202796419U (en) | 2013-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220462534.2U Expired - Lifetime CN202796419U (en) | 2012-09-12 | 2012-09-12 | Current transformer for accurately measuring linearity of small current and unsaturation degree of large current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202796419U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103996508A (en) * | 2014-05-26 | 2014-08-20 | 国家电网公司 | Mutual inductor with waterproof casing |
| CN105738675A (en) * | 2014-12-26 | 2016-07-06 | 甲神电机株式会社 | Holder for saturable magnetic core, holding method and magnetic flux gate current transducer |
| CN106291432A (en) * | 2016-08-26 | 2017-01-04 | 广东电网有限责任公司佛山供电局 | The method of inspection of CT saturation degree and system |
| CN106373714A (en) * | 2016-10-17 | 2017-02-01 | 江阴市星火电子科技有限公司 | Waterproof type mutual inductor and assembling process therefor |
| CN108231385A (en) * | 2018-03-22 | 2018-06-29 | 国家海洋技术中心 | The ocean inductively underwater magnet ring of data transmission |
| CN109387690A (en) * | 2018-12-06 | 2019-02-26 | 国网辽宁省电力有限公司鞍山供电公司 | A kind of portable high-pressure based on arc laminated core is wireless current detection means |
-
2012
- 2012-09-12 CN CN201220462534.2U patent/CN202796419U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103996508A (en) * | 2014-05-26 | 2014-08-20 | 国家电网公司 | Mutual inductor with waterproof casing |
| CN103996508B (en) * | 2014-05-26 | 2016-04-13 | 国家电网公司 | A kind of instrument transformer with water proof type shell |
| CN105738675A (en) * | 2014-12-26 | 2016-07-06 | 甲神电机株式会社 | Holder for saturable magnetic core, holding method and magnetic flux gate current transducer |
| CN105738675B (en) * | 2014-12-26 | 2020-04-10 | 甲神电机株式会社 | Saturable core holder, saturable core fixing method and fluxgate current sensor |
| CN106291432A (en) * | 2016-08-26 | 2017-01-04 | 广东电网有限责任公司佛山供电局 | The method of inspection of CT saturation degree and system |
| CN106373714A (en) * | 2016-10-17 | 2017-02-01 | 江阴市星火电子科技有限公司 | Waterproof type mutual inductor and assembling process therefor |
| CN106373714B (en) * | 2016-10-17 | 2017-12-01 | 江阴市星火电子科技有限公司 | Water proof type transformer and its assembly technology |
| CN108231385A (en) * | 2018-03-22 | 2018-06-29 | 国家海洋技术中心 | The ocean inductively underwater magnet ring of data transmission |
| CN108231385B (en) * | 2018-03-22 | 2024-05-03 | 国家海洋技术中心 | Ocean inductively coupled data transmission underwater magnetic ring |
| CN109387690A (en) * | 2018-12-06 | 2019-02-26 | 国网辽宁省电力有限公司鞍山供电公司 | A kind of portable high-pressure based on arc laminated core is wireless current detection means |
| CN109387690B (en) * | 2018-12-06 | 2024-02-06 | 国网辽宁省电力有限公司鞍山供电公司 | Portable high-voltage wireless current detection device based on arc laminated iron core |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 250101 A203, block F, entrepreneurship square, Qilu Software Park, No.1 Shunhua Road, high tech Development Zone, Jinan City, Shandong Province Patentee after: Conway Communication Technology Co.,Ltd. Address before: 250101 Qilu Software Park, No. 1 Shunhua Road, Jinan High-tech Development Zone, Shandong Province, A 203 Patentee before: SHANDONG KANGWEI COMMUNICATION TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130313 |