CN205230781U - Three -phase current transformer's magnetism shielding structure based on air core coil - Google Patents
Three -phase current transformer's magnetism shielding structure based on air core coil Download PDFInfo
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- CN205230781U CN205230781U CN201520919351.2U CN201520919351U CN205230781U CN 205230781 U CN205230781 U CN 205230781U CN 201520919351 U CN201520919351 U CN 201520919351U CN 205230781 U CN205230781 U CN 205230781U
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- air core
- core coil
- box body
- shielding structure
- current transformer
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Abstract
Three -phase current transformer's magnetism shielding structure based on air core coil includes: box body and lid, the box body with the lid assembly forms the enclosure space that holds the air core coil, be provided with phase partition in the box body, phase partition will box body internal partitioning is 3 and holds the chamber, and each holds the intracavity and sets up an air core coil, be provided with 3 pairs of locating holes on the bottom surface of box body, a pair of locating hole corresponds with an air core coil, the elementary stream that the locating hole supplied to link to each other with the air core coil passes, be provided with respectively the pin hole that corresponds with three air core coil on the lid, the signal line that the pin hole supplied to link to each other with the air core coil passes. The utility model discloses can completely cut off the external magnetic field and disturb the influence when measuring the component to the air core coil as the three phase current of three -phase electric energy meter, be favorable to guaranteeing air core coil measured value and three -phase electric energy meter measuring accuracy's accuracy, stability and uniformity.
Description
Technical field
The utility model relates to the design of current transformer, particularly relates to a kind of magnet shielding structure of the threephase current transformer based on air core coil.
Background technology
Existing market is more and more higher to multinomial technical requirements such as the measurement current dynamic range of measuring instrumentation, saturated, the anti-high-intensity magnetic field of anti-direct current, electrical isolation, and traditional current transformer is subject to the restriction of technology and cost, cannot meet this development need.Air core coil is owing to having the characteristics such as wide dynamic range, saturated, the anti-high-intensity magnetic field of anti-direct current, good electrical isolation, and the advantage of low cost, is applied to field of current measurement and has positive meaning.
Air core coil leans on the principle of electromagnetic coupled to realize primary current amplitude and phase measurement, due to the discreteness of air core coil wire winding and its output signal weak, air core coil is inevitably caused easily to be subject to the interference of other electromagnetic signals of coil outer, coil is caused to measure the electromagnetic signal of non-primary current, impact adopts air core coil to judge as the table meter event of current measuring transformer, cause measuring accuracy inaccurate, so, how to design electromagnetic shielding measure, be subject to external electromagnetic interference significant to avoid air core coil.
Utility model content
The purpose of this utility model is to provide the magnet shielding structure of the good threephase current transformer based on air core coil of a kind of shield effectiveness.
To achieve these goals, the utility model takes following technical solution:
Based on the magnet shielding structure of the threephase current transformer of air core coil, comprising: box body and lid, described box body and described lid assemble the enclosure space being formed and hold air core coil; Phase partition is provided with in described box body, described tray interior is divided into 3 container cavities by described phase partition, an air core coil is set in each container cavity, the bottom surface of described box body is provided with 3 pairs of location holes, a pair location hole is corresponding with an air core coil, and described location hole passes for the current line be connected with air core coil; Described lid is provided with fairlead corresponding with three air core coils respectively, described fairlead passes for the holding wire be connected with air core coil.
Further, the gap of a connection two location holes is offered between described every a pair location hole.
Further, the width in described gap is 1.5 millimeters.
Further, described current line is arranged with three-phase electric energy meter main terminal and is connected.
Further, described holding wire is connected with the sample circuit of three-phase electric energy meter.
Further, the magnet shielding structure that described box body and lid are formed is connected with the ground wire of three-phase electric energy meter.
From above technical scheme, shielding construction of the present utility model is made up of box body and lid, be divided into the separate space of placing air core coil by phase partition in box body, extraneous electromagnetic signals not only can be avoided to cause interference to air core coil, also can prevent from not interfering with each other between homophase air core coil, be conducive to the interference of isolated external magnetic field to the impact during three-phase current measuring element of air core coil as three-phase electric energy meter, the stability of measured value can be improved, and improve stability and the consistency of measuring accuracy.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment, simple introduction is done below by the accompanying drawing used required in embodiment or description of the prior art, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the utility model embodiment.
Fig. 2 is the structural representation of another angle of the utility model.
Fig. 3 is decomposition texture schematic diagram of the present utility model.
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in more detail.
Embodiment
With reference to Fig. 1, Fig. 2 and Fig. 3, magnet shielding structure of the present utility model comprises box body 1 and lid 2, and box body 1 and lid 2 are assembled together and form the enclosure space of accommodation air core coil.Magnet shielding structure of the present utility model is arranged in three-phase electric energy meter, air core coil is the current sample element of electric energy meter, air core coil comprises A phase air core coil, B phase air core coil and C phase air core coil, 3 air core coils are connected by once holding conductor (current line) to arrange with three-phase electric energy meter main terminal, size and the phase place of primary side (input) alternating current are flow through in air core coil induction, export the differential signal of alternating current from secondary side (output).
Be provided with two panels phase partition 3 in box body 1, space in box body 1 is divided into three container cavities by phase partition 3, holds A, B, C phase air core coil respectively, and phase partition 3 provides magnetic screen for the air core coil of three in box body 1.For convenience of description, the side that box body 1 is relative with lid 2 is defined as bottom surface, the bottom surface of box body 1 is provided with 3 couples of location hole 1a, all offers the gap 1b of these two location hole 1a of a connection between every a pair location hole 1a, a pair location hole is corresponding with an air core coil.The current line that location hole 1a is used for for being connected with air core coil is passed, and primary side current signal flows out from current line after flowing through air core coil by current line again.Such as, be connected through arranging with the main terminal of electric energy meter after a pair location hole corresponding with A phase air core coil with two current line that A phase air core coil is connected, primary side current flows out from another root current line after flowing into A phase air core coil from a current line.
In embodiment of the present utility model, gap is set between two location holes, the flux loop of magnet shielding structure at corresponding air core coil place under outside magnetic disturbance can be cut off, be conducive to the effect improving the outside magnetic disturbance of shielding; And this gap can cut off the coupling circuit of magnetic interference between each phase air core coil, arranges in pairs or groups with phase partition, jointly improve the alternate antijamming capability of the threephase current transformer based on air core coil.Consider shield effectiveness when this gap exists and the processing and manufacturing based on this structure, this gap position is selected between two location holes, within gap width can be chosen at 1.5mm.
Lid 2 offers fairlead 2a corresponding with three air core coils respectively, fairlead 2a passes for the holding wire be connected with air core coil, and the induced signal of air core coil secondary side exports through holding wire, and holding wire is connected with the sample circuit of three-phase electric energy meter.
Box body of the present utility model, lid and phase partition all adopt high permeability materials to make, as electrical pure iron etc. is easy to the material of processing.The shielding space that box body and lid are formed is enough large, walk along this shielding construction to facilitate the magnetic line of force of external disturbing field, enough little of the inner remnant fields of 3 container cavities that box body lid and phase partition are formed, be unlikely to affect air core coil sense residual interference magnetic field to affect its apply three-phase electric energy meter event judge and the accuracy of metering, improve shielding properties with this.
Simultaneously, magnet shielding structure of the present utility model is connected with the ground wire of three-phase electric energy meter, to make magnet shielding structure and the same electromotive force of three-phase electric energy meter earth signal, no current on magnet shielding structure, prevent the weak current that shielding construction is responded to from disturbing the secondary of inner air core coil, and then guarantee is based on the measuring accuracy accuracy of the threephase current transformer of air core coil and stability.
Above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit, although be described in detail the utility model with reference to above-described embodiment, those of ordinary skill in the field are to be understood that, still can modify to embodiment of the present utility model or equivalent replacement, and not departing from any amendment of the utility model spirit and scope or equivalent replacement, it all should be encompassed among right of the present utility model.
Claims (6)
1. based on the magnet shielding structure of the threephase current transformer of air core coil, it is characterized in that, comprising:
Box body and lid, described box body and described lid assemble the enclosure space being formed and hold air core coil;
Phase partition is provided with in described box body, described tray interior is divided into 3 container cavities by described phase partition, an air core coil is set in each container cavity, the bottom surface of described box body is provided with 3 pairs of location holes, a pair location hole is corresponding with an air core coil, and described location hole passes for the current line be connected with air core coil;
Described lid is provided with fairlead corresponding with three air core coils respectively, described fairlead passes for the holding wire be connected with air core coil.
2., as claimed in claim 1 based on the magnet shielding structure of the threephase current transformer of air core coil, it is characterized in that: the gap offering a connection two location holes between described every a pair location hole.
3., as claimed in claim 2 based on the magnet shielding structure of the threephase current transformer of air core coil, it is characterized in that: the width in described gap is 1.5 millimeters.
4., as claimed in claim 1 based on the magnet shielding structure of the threephase current transformer of air core coil, it is characterized in that: described current line is arranged with three-phase electric energy meter main terminal and is connected.
5., as claimed in claim 1 based on the magnet shielding structure of the threephase current transformer of air core coil, it is characterized in that: described holding wire is connected with the sample circuit of three-phase electric energy meter.
6., as claimed in claim 1 based on the magnet shielding structure of the threephase current transformer of air core coil, it is characterized in that: the magnet shielding structure that described box body and lid are formed is connected with the ground wire of three-phase electric energy meter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201520919351.2U CN205230781U (en) | 2015-11-17 | 2015-11-17 | Three -phase current transformer's magnetism shielding structure based on air core coil |
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CN201520919351.2U CN205230781U (en) | 2015-11-17 | 2015-11-17 | Three -phase current transformer's magnetism shielding structure based on air core coil |
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CN205230781U true CN205230781U (en) | 2016-05-11 |
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CN201520919351.2U Expired - Fee Related CN205230781U (en) | 2015-11-17 | 2015-11-17 | Three -phase current transformer's magnetism shielding structure based on air core coil |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108051621A (en) * | 2017-12-18 | 2018-05-18 | 中山市晓明电器实业有限公司 | A kind of composite ultraphonic ripple standing wave electric current and vector current collector |
CN111430140A (en) * | 2020-04-29 | 2020-07-17 | 河北申科电力股份有限公司 | Wide-temperature miniature combined current transformer |
-
2015
- 2015-11-17 CN CN201520919351.2U patent/CN205230781U/en not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108051621A (en) * | 2017-12-18 | 2018-05-18 | 中山市晓明电器实业有限公司 | A kind of composite ultraphonic ripple standing wave electric current and vector current collector |
CN108051621B (en) * | 2017-12-18 | 2019-10-25 | 中山市晓明电器实业有限公司 | A kind of composite ultraphonic wave standing wave electric current and vector current collector |
CN111430140A (en) * | 2020-04-29 | 2020-07-17 | 河北申科电力股份有限公司 | Wide-temperature miniature combined current transformer |
CN111430140B (en) * | 2020-04-29 | 2021-05-11 | 河北申科电力股份有限公司 | Wide-temperature miniature combined current transformer |
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Legal Events
Date | Code | Title | Description |
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C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160511 Termination date: 20181117 |