CN2368141Y

CN2368141Y - Protective cover for mutual-inductor

Info

Publication number: CN2368141Y
Application number: CN 99207654
Authority: CN
Inventors: 王少华
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-04-02
Filing date: 1999-04-02
Publication date: 2000-03-08
Anticipated expiration: 2009-04-02

Abstract

The utility model discloses a protective cover for mutual inductors, which aims to solve the problems of the prior art that the anti-interference capability of protective covers for mutual inductors is not ideal. The protective cover for mutual inductors comprises a sealed casing with a shape corresponding to the shape of a mutual inductor, wherein, a hole is respectively arranged on corresponding positions of two opposite side walls of the casing, and the side walls extend downwards along the holes, and mutually connected into a seamless through hole wall; one section of annular area of the surface of the through hole wall is exposed outside, and both the surfaces of the casing and the through hole wall are coated with at least one layer of complete electroplating metal film. The utility model can be widely used in places which use mutual inductors.

Description

A kind of instrument transformer protective cover

The utility model relates to a kind of instrument transformer protective cover.

Instrument transformer is the requisite electronic component of electron trade, but instrument transformer is subjected to the interference in magnetic field that space clutter, power circuit produce etc. through regular meeting, the precision of instrument transformer is affected, thereby the directly measurement of influence back level circuit, serious also can cause such as consequences such as computer corruptions; Simultaneously, the electric capacity that exists between the output of instrument transformer and the input also has influence on the antijamming capability of instrument transformer.

The purpose of this utility model provides a kind of instrument transformer protective cover that can obviously stop instrument transformer to be subjected to external interference, reduction I/O electric capacity.

For achieving the above object, the utility model is taked following design: a kind of instrument transformer protective cover comprises the corresponding housing that seals of a shape and instrument transformer shape; Relevant position on the two opposite side walls of described housing has an open-work, described open-work wall and described housing seamless link; Except that the surface of described open-work wall have one section ring-type exposed, the surface of described housing and the surface of described open-work wall all scribble the complete electroplating metal film of one deck at least.

In order not produce electric capacity between the I/O that makes the voltage-type instrument transformer, a metallic plate consistent with the open-work direction is arranged in the described open-work.

The utility model is owing to adopted above-mentioned design, housing is when carrying out electroplating the first time, not only plated metal film equably on the housing, also plated metal film on the wall of open-work, make extraneous interference can not have influence on instrument transformer, especially after housing plates second tunic, more strengthened its anti-jamming capacity; Owing to added metallic plate in the open-work of instrument transformer protective cover, make between the I/O of voltage-type instrument transformer and do not produce electric capacity, improve the antijamming capability of instrument transformer.

Experiment showed, the not instrument transformer protective cover of metal-coated membrane, the interference of the anti-300V of voltage transformer energy, the interference of the anti-600V of current transformer energy, and its antijamming capability becomes several times to increase after adding metal-coated membrane.

Below in conjunction with accompanying drawing embodiment of the present utility model is described further.

Fig. 1 is a cutaway view of the present utility model

As shown in Figure 1, the housing 1 of sealing is corresponding with instrument transformer 2 shapes that are positioned at it, and the coil input of instrument transformer 2, output 8 stretch out outside the housing 1; Relevant position on the two opposite side walls 101,102 of housing 1 has an open-work 5, the wall of open-work 5 and housing 1 seamless link; Except that the surface of open-work 5 walls have one section 501 ring-type exposed, the surface of the surface of housing 1 and open-work 5 walls all scribbles the complete copper film of one deck 6.

In order to make antijamming capability of the present utility model stronger, as shown in Figure 1, in the above-described embodiments, add plating one deck chromium film 7 on the surface of housing 1 again.

In order not produce electric capacity between the I/O that makes the voltage-type instrument transformer, in the above-described embodiments, can establish a metallic plate consistent in the open-work with the open-work direction, metallic plate length is identical with open-work, and shape is identical with the vertical section of open-work.

The utility model is used for the metal of plated film and selectes according to different needs; The shape of instrument transformer protective cover can change according to the shape difference of instrument transformer, and the shape of the open-work that the open-work wall is surrounded is various.

Claims

1, a kind of instrument transformer protective cover is characterized in that: the housing that comprises the corresponding sealing of a shape and instrument transformer shape; Relevant position on the two opposite side walls of described housing has an open-work, described open-work wall and described housing seamless link; Except that the surface of described open-work wall have one section ring-type exposed, the surface of described housing and the surface of described open-work wall all scribble the complete electroplating metal film of one deck at least.

2, a kind of instrument transformer protective cover according to claim 1, it is characterized in that: the electroplating metal film of described hull outside is two layers.

3, a kind of instrument transformer protective cover according to claim 1 and 2 is characterized in that: a metallic plate consistent with the open-work direction is arranged in the described open-work.

4, a kind of instrument transformer protective cover according to claim 3, it is characterized in that: the metallic plate length in the described open-work is identical with open-work, and shape is identical with the vertical section of open-work.