CN202230862U

CN202230862U - After-current transformer

Info

Publication number: CN202230862U
Application number: CN2011203081125U
Authority: CN
Inventors: 邓国平; 周龙明; 王颂凯; 叶文杰; 金建达
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2011-08-23
Filing date: 2011-08-23
Publication date: 2012-05-23
Anticipated expiration: 2021-08-23

Abstract

The utility model discloses an after-current transformer, which comprises a casing. An accommodating cavity is formed inside the casing, and a transformer assembly composed of a rectangular iron core assembly, a shielding ring and a shielding sheet assembly is arranged inside the accommodating cavity, wherein the rectangular iron core assembly is electrically connected with a wiring board, and the wiring board is arranged in the accommodating cavity too. The rectangular iron core assembly comprises an iron core, a measuring coil and a testing coil, wherein the measuring coil and the testing coil are wound on the iron core. The iron core is formed by winding permalloy. A socket is arranged on the wiring board. The after-current transformer is provided with the testing coil and is convenient for users to detect whether performance of the after-current transformer is normal. The after-current transformer is in a rectangular shape and is especially suitable for a frame breaker with big rated current and good in balancing performance.

Description

A kind of residual current transformer

Technical field

The utility model belongs to the low-voltage electrical apparatus field, particularly a kind of residual current transformer.

Background technology

Common circuit breaker is used for the less breaker of plastic casing of current specification mostly with residual current transformer at present, and is installed on circuit breaker inside.For frame circuit breaker; Because overall volume is much bigger than breaker of plastic casing; Consider simultaneously that the frame circuit breaker inner space is limited, bus produces higher temperature rise, electric insulation and factor such as easy for installation during the big electric current of operation; Frame circuit breaker generally is installed on the circuit breaker outside with residual current transformer, so frame circuit breaker is more much bigger with the overall dimension of residual current transformer than breaker of plastic casing with the overall dimension of residual current transformer.

Because frame circuit breaker is bigger with residual current transformer overall dimension; The iron core loop area that surrounds bus also increases thereupon; Will have influence on the equilibrium response of residual current transformer like this according to Theory of Electromagnetic Field; And the electric current of frame circuit breaker actual motion is generally in several kiloamperes even reach ampere up to ten thousand, and more much bigger than the electric current of breaker of plastic casing actual motion, the importance of reliable operation is obvious.In addition; Breaker of plastic casing is measured the coil except having with residual current transformer; Usually the testing coil that also has a group or more, whether normal, will certainly produce interference to measuring coil but increase testing coil as everyone knows if being convenient to user test residue instrument transformer performance; Particularly can reduce the balance quality of residual current transformer; But because the electric current of iron core loop area and actual motion is all less, general measure can reduce testing coil to measuring the interference of coil to breaker of plastic casing basically, satisfies the normal operation of circuit breaker with residual current transformer.And use residual current transformer for frame circuit breaker, and the electric current of iron core loop area and actual motion is all bigger, and prior art can not satisfy the demands.

The utility model content

The technical problem that the utility model solved is to provide a kind of simple in structure, balance quality better and can satisfy the user and can detect the frame circuit breaker residual current transformer.

For solving the problems of the technologies described above; A kind of residual current transformer of the utility model; Comprise shell, the inside of shell forms a cavity volume, the transformer component that the cavity volume set inside is made up of rectangle iron core assembly, shading ring, shield blade assembly; Wherein the rectangle iron core assembly is electrically connected with terminal block, and this terminal block also is arranged in cavity volume.Described rectangle iron core assembly comprises iron core, is wound on measurement coil and testing coil on the iron core.Described iron core is reeled by Alperm and is processed.On the described terminal block socket is set.Described shading ring comprises inner shield ring and external shield ring, and the external shield ring is arranged on the periphery of inner shield ring.

The utility model compared with prior art; Its remarkable advantage is: the residual current transformer of the utility model has testing coil; Whether being convenient to the user, to detect the residual current transformer performance normal; The residual current transformer profile is a rectangle, and it is better to be particularly suitable for bigger frame circuit breaker of rated current and instrument transformer balance quality.

Description of drawings

Fig. 1 is the utility model residual current transformer structural representation.

Fig. 2 is the utility model residual current transformer core assembly partial enlarged drawing.

Fig. 3 is that the utility model residual current transformer is along A-A line cut-away view.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail.

In conjunction with Fig. 1, Fig. 2, Fig. 3; A kind of residual current transformer of the utility model; Comprise shell 5, the inside of shell 5 forms a cavity volume 51, the transformer component that cavity volume 51 set inside are made up of rectangle iron core assembly 2, shading ring 1, shield blade assembly 4; Wherein rectangle iron core assembly 2 is electrically connected with terminal block 3, and this terminal block 3 also is arranged in cavity volume 51.Described rectangle iron core assembly 2 comprises iron core 21, is wound on measurement coil 22 and testing coil 23 on the iron core 21.Described iron core 21 is reeled by Alperm and is processed.On the described terminal block 3 socket 31 is set.Described shading ring 1 comprises inner shield ring 12 and external shield ring 11, and external shield ring 11 is arranged on the periphery of inner shield ring 12.

Particularly; A kind of residual current transformer of the utility model; Comprise shell 5; The described shell 5 inner cavity volumes 51 that form, described cavity volume 51 inside are equipped with the transformer component of being made up of rectangle iron core assembly 2, shading ring 1, shield blade assembly 4, and are installed in the terminal block 3 that is electrically connected with rectangle iron core assembly 2 in the cavity volume 51.

Described iron core 21 is reeled by Alperm and is processed, through being loaded on after the heat treatment in the aluminium alloy protection box 8, close the lid 7 backs with yellow cured be with close around, with the fixing box 8 of protecting.During making, at first coil 22 is measured in coiling on protection box 8, around one deck insulating material 9 back coiling testing coils 23, forms rectangle iron core assembly 2 again.Measure coil 22 and link to each other with terminal block 3 through the welding hole on the terminal block 3 with the lead-out wire of testing coil 23, described electronics terminal block 3 is provided with socket 31, measures coil 22 and is connected with outside through socket 31 with testing coil 23.In the shading ring 1 of inner shield ring 12 and external shield ring 11 compositions, put into rectangle iron core assembly 2; Shield blade assembly 4 is formed one after being fixed with 703 glue by shield blade; Shield blade assembly 4 shell 5 of after the inner shield ring 12 of putting into core assembly 2, external shield ring 11 are fixedly clamped, packing into, and use silica stationary, also use silica stationary behind the draw-in groove 52 that terminal block 3 inserts in the shells 5; After treating that silica gel solidifies; Inwall along shell 5 pours into Embedding Material 6, shield blade assembly 4, inner shield ring 12, external shield ring 11 and terminal blocks 3 etc. in the shell 5 is all covered, but can not cover the Wiring port of terminal block 3.

Claims

1. residual current transformer; It is characterized in that: comprise shell [5]; The inside of shell [5] forms a cavity volume [51]; The transformer component that cavity volume [51] set inside is made up of rectangle iron core assembly [2], shading ring [1], shield blade assembly [4], wherein rectangle iron core assembly [2] is electrically connected with terminal block [3], and this terminal block [3] also is arranged in cavity volume [51].

2. residual current transformer according to claim 1 is characterized in that: described rectangle iron core assembly [2] comprises iron core [21], is wound on measurement coil [22] and testing coil [23] on the iron core [21].

3. residual current transformer according to claim 2 is characterized in that: described iron core [21] is reeled by Alperm and is processed.

4. residual current transformer according to claim 1 is characterized in that: socket [31] is set on the described terminal block [3].

5. residual current transformer according to claim 1 is characterized in that: described shading ring [1] comprises inner shield ring [12] and external shield ring [11], and external shield ring [11] is arranged on the periphery of inner shield ring [12].