CN204375555U - A kind of novel current transformer - Google Patents
A kind of novel current transformer Download PDFInfo
- Publication number
- CN204375555U CN204375555U CN201420811878.9U CN201420811878U CN204375555U CN 204375555 U CN204375555 U CN 204375555U CN 201420811878 U CN201420811878 U CN 201420811878U CN 204375555 U CN204375555 U CN 204375555U
- Authority
- CN
- China
- Prior art keywords
- spring
- upper cover
- box
- device body
- current transformer
- Prior art date
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- Expired - Fee Related
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Abstract
The utility model discloses a kind of novel current transformer, comprise upper cover, lower cover, device body, a wire clamp, spring, alignment pin, fastener, protect box and spacing change over switch, described upper cover and described lower cover are installed on the two ends up and down of described device body respectively, described device body be provided with a multiple described wire clamp, in described upper cover, described spring is installed, one end of described spring be installed on described on the described alignment pin that covers be connected, the other end of described spring protects box described in described upper cover side and is connected with being installed on, describedly to protect on box engaging and have described fastener, the bottom of described lower cover is connected with described spacing change over switch by wire.The utility model protects box by setting can not be subject to external magnetic field interference, arranges spring and spacer pin, can make the size limiting rated current, can carry out DC component; The utility model has the advantage that stability is strong, structure simple, the scope of application is comparatively wide and useful life is longer.
Description
Technical field
The utility model relates to a kind of instrument transformer, particularly relates to a kind of novel current transformer.
Background technology
The theoretical foundation of current transformer is electromagnetic induction, is generally made up of the iron core closed and winding.Rated current, as a major parameter of current transformer, refers to the lowest high-current value that current transformer can bear under the operational environment allowed.
Domestic and international current transformer specification and shape have a variety of, but the inductance ratings of traditional current transformer is nearly all below 20 peaces, when electric power system primary equipment breaks down, there will be the electric current of running current more than 20 times in system.In addition, owing to having inductance in circuit, short circuit current can not increase suddenly.So also there will be an and direct current of decaying contrary with periodic component electric current in incipient moment (during t=0), i.e. aperiodic component, superimposed with short circuit current.When voltage initial angle be 0 ° or 180 ° time, the maximum instantaneous value of short circuit current half cycle after short circuit occurs.And traditional instrument transformer is after electric current is raised to 20 of rated value, magnetic flux unshakable in one's determination close to zone of saturation, thus causes output waveform to distort, and the aperiodic component of the secondary progress of disease is decayed in advance, and after failure removal, secondary output is with a series of phenomenons such as hangovers.In recent years, along with the upgrading of system, also require that instrument transformer accurately can measure 30 times of running current or even the short circuit current of 40 times, and accurately can reflect the waveform of aperiodic component truly.This is difficult to realize, especially there is short trouble in system, transformer primary electric current is when being raised to 20 times of-60 times of rated current, existing current transformer can not the DC component of accurate progress of disease 20-160ms, there is no good transient process response, truly can not reflect the attenuation state of aperiodic component, output waveform easily after saturated and distortion and failure removal primary current when being zero secondary waveform have conditions of streaking, damping time constant error, peak error are large.Existing small product size is large, complex process and unstable, can not meet the upgrading requirement of system.
Along with the proposition of national intelligent grid, intelligent substation has started to come into State Grid's system, electronic current mutual inductor is the important component part of intelligent grid, relative to traditional ammeter, instrument transformer, Luo-coil is as the primary sensing element detecting electric current, there is the linearity good, without magnetic saturation; Measuring range is wide, can from a few A to hundreds of kA.But there is very large interference in extraneous magnetic field to Luo-coil.
Utility model content
The purpose of this utility model is just to provide a kind of novel current transformer to solve the problem.
The utility model is achieved through the following technical solutions above-mentioned purpose:
The utility model comprises upper cover, lower cover, device body, a wire clamp, spring, alignment pin, fastener, protect box and spacing change over switch, described upper cover and described lower cover are installed on the two ends up and down of described device body respectively, described device body is provided with a multiple described wire clamp, in described upper cover, described spring is installed, one end of described spring be installed on described on the described alignment pin that covers be connected, the other end of described spring protects box described in described upper cover side and is connected with being installed on, describedly to protect on box engaging and have described fastener, the bottom of described lower cover is connected with described spacing change over switch by wire.
Further, the middle part of described device body is provided with " U " font groove, and described primary line folder comprises three, around being arranged on the inwall of described " U " font groove.
Further, described fastener can rotate described protecting on box.
Further, described ring spring winding is placed on the outer wall of described " U " font groove.
The beneficial effects of the utility model are:
The utility model protects box by setting can not be subject to external magnetic field interference, arranges spring and spacer pin, can make the size limiting rated current, can carry out DC component; The utility model has the advantage that stability is strong, structure simple, the scope of application is comparatively wide and useful life is longer.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of novel current transformer described in the utility model.
In figure: the spacing change over switch of 1-, 2-wire clamp, 3-lower cover, 4-upper cover, 5-alignment pin, 6-spring, 7-fastener, 8-protect box, 9-device body, 10-wire.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1: the utility model comprises upper cover 4, lower cover 3, device body 9, a wire clamp 2, spring 6, alignment pin 5, fastener 7, protect box 8 and spacing change over switch 1, upper cover 3 and lower cover 3 are installed on the two ends up and down of device body 9 respectively, the middle part of device body 9 is provided with " U " font groove, a described wire clamp 2 comprises three, around being arranged on the inwall of " U " font groove, spring 6 is installed in upper cover 4, spring 6 is around being arranged on the outer wall of " U " font groove, one end of spring 6 is connected with the alignment pin 5 be installed on upper cover 4, the other end of spring 6 is connected with the box 8 that protects being installed on upper cover 4 side, protect engaging on box 8 and have fastener 7, fastener 7 can protect rotation on box 8, the bottom of lower cover 3 is connected with spacing change over switch 1 by wire 10.
Those skilled in the art do not depart from essence of the present utility model and spirit, various deformation scheme can be had to realize the utility model, the foregoing is only the better feasible embodiment of the utility model, not thereby interest field of the present utility model is limited to, the equivalent structure change that all utilization the utility model specifications and accompanying drawing content are done, is all contained within interest field of the present utility model.
Claims (4)
1. a novel current transformer, it is characterized in that: comprise upper cover, lower cover, device body, a wire clamp, spring, alignment pin, fastener, protect box and spacing change over switch, described upper cover and described lower cover are installed on the two ends up and down of described device body respectively, described device body is provided with a multiple described wire clamp, in described upper cover, described spring is installed, one end of described spring be installed on described on the described alignment pin that covers be connected, the other end of described spring protects box described in described upper cover side and is connected with being installed on, describedly to protect on box engaging and have described fastener, the bottom of described lower cover is connected with described spacing change over switch by wire.
2. a kind of novel current transformer according to claim 1, is characterized in that: the middle part of described device body is provided with " U " font groove, and described primary line folder comprises three, around being arranged on the inwall of described " U " font groove.
3. a kind of novel current transformer according to claim 1, is characterized in that: described fastener can rotate described protecting on box.
4. a kind of novel current transformer according to claim 2, is characterized in that: described ring spring winding is placed on the outer wall of described " U " font groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420811878.9U CN204375555U (en) | 2014-12-22 | 2014-12-22 | A kind of novel current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420811878.9U CN204375555U (en) | 2014-12-22 | 2014-12-22 | A kind of novel current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204375555U true CN204375555U (en) | 2015-06-03 |
Family
ID=53331751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420811878.9U Expired - Fee Related CN204375555U (en) | 2014-12-22 | 2014-12-22 | A kind of novel current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204375555U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105575603A (en) * | 2016-01-15 | 2016-05-11 | 胡小青 | High-voltage instrument transformer for improving wire clamping strength |
| CN105845420A (en) * | 2016-05-16 | 2016-08-10 | 国家电网公司 | Buckle type current transformer |
-
2014
- 2014-12-22 CN CN201420811878.9U patent/CN204375555U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105575603A (en) * | 2016-01-15 | 2016-05-11 | 胡小青 | High-voltage instrument transformer for improving wire clamping strength |
| CN105845420A (en) * | 2016-05-16 | 2016-08-10 | 国家电网公司 | Buckle type current transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150603 Termination date: 20151222 |
|
| EXPY | Termination of patent right or utility model |