CN208256448U - A kind of current transformer - Google Patents

Abstract

The utility model relates to a kind of current transformers, the current transformer includes bus casing, one end of bus casing is connect with cabinet body, the other end of bus casing is equipped with plugging plate, the current transformer further includes housing, housing includes housing ontology and is fixed on the inside of housing ontology, at least two fixed structures to extend internally, fixed structure is equipped at least one through-hole, the axis of through-hole and the axis of housing ontology are parallel to each other, constitute the mounting hole for installing plugging plate and/or shielding line, at least one described through-hole constitutes the location hole for the core pulling location fit with mutual-inductor mould simultaneously.The problem of electric property difference present in current transformer of the existing end with plugging plate mounting hole has been well solved using the housing of this structure, it is very useful.

Description

A kind of current transformer

Technical field

The utility model relates to mutual inductor fields, are specifically related to a kind of current transformer.

Background technique

At present there are two types of the mounting means of contact cabinet median generatrix bushing transformer: one is the metal structures being fixed in cabinet On frame, another kind is fixed on the side plate of switchgear.In order to meet metering, measurement and the requirement of defencive function, in mutual inductance Multiple windings can be tied on device, along with the requirement of user's large capacity, it is larger to directly result in mutual inductor shape, in this way using will When bus sheath tubular type mutual inductor is fixed on this mounting means in switch cabinet side panel, understand that some is exposed outside switchgear, such as Fruit part not exposed to mutual inductor carries out closure processing, will make easily the wearing from mutual inductor end of the micronic dust in external environment Enter at round, to accumulate in mutual inductor product surface or switchgear, and then form one layer of dirt, when encounter mist, dew, When the weather such as drizzle, conductance increases, so that decreasing insulating, so that the normal operation to power equipment causes certain peace Full hidden danger.

On the other hand, current transformer also has shielding construction, and in bushing transformer production process, shielding is tied Fixed requirement of the structure in mold is stringenter, and the fixed bad generation that will lead to partial discharge phenomenon influences current transformer Electric property.

For the closure processing of current transformer exposed parts, notification number is that the Chinese patent of CN207097649U discloses A kind of structure, i.e., in the direct aperture in the end of current transformer casing to install plugging plate, although this structure can be realized pair The effective protection of mutual inductor end exposed parts, but the overall structure of current transformer casing can be destroyed, reduce Current Mutual Inductance The insulation performance and electric property of device.

Utility model content

In view of the above-mentioned problems, the purpose of this utility model is to provide a kind of current transformer, to solve existing end The problem of the difference of electric property existing for current transformer with plugging plate mounting hole.

To achieve the above object, technical solution provided by the utility model is: a kind of current transformer, including bus sheath Pipe, one end of the bus casing are connect with cabinet body, and the other end of the bus casing is equipped with plugging plate, the current transformer Further include housing, the housing include housing ontology and be fixed at it is on the inside of housing ontology, at least two to The fixed structure of interior extension, the fixed structure are equipped at least one through-hole, axis and the housing ontology of the through-hole Axis is parallel to each other, constitutes the mounting hole for installing plugging plate and/or shielding line, at least one described through-hole constitutes use simultaneously In the location hole of the core pulling location fit with mutual-inductor mould.

The utility model has the beneficial effects that the current transformer is equipped with housing, on the fixed structure being arranged on housing Equipped at least one through-hole, which can will be sealed when current transformer is installed on the side plate of switchgear with appended claims Closure plate is mounted on current transformer, is avoided and is opened up plugging plate mounting hole in the end of current transformer, thus also it is avoided that The impurities accumulations such as the micronic dust in environment influence insulation performance on mutual inductor surface；This through-hole can also be tight by inserting simultaneously Housing is fixed in the core pulling of current transformer mold by firmware, enables position in the current transformer of housing after shaping It sets between two parties, reaches better shield effectiveness, make its excellent electric properties and stabilization.

Further, plugging plate is fixed on current transformer in order to facilitate fastener, while also facilitated housing It is fixed in the core pulling of current transformer mold, limits the through-hole as threaded hole.

Further, in order to make current transformer have good shield effectiveness, keep the field distribution in it more uniform, It limits the housing ontology and fixed structure is made of metal material.

Further, for the ease of the connection of housing ontology and fixed structure, at the arris for limiting the fixed structure Whole rounded corners, fixed structure are cambered surface identical with circular diameter in housing ontology with housing ontology junction.

Further, in order to enable housing preferably positions in current transformer, the fixed structure is limited around screen The axis for covering set ontology is evenly arranged.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of housing on the current transformer；

Fig. 2 is the cross-sectional view of housing in Fig. 1；

Fig. 3 is the structural schematic diagram of metal fixed block on housing；

Fig. 4 is the schematic diagram of the current transformer；

In figure, 1- housing, 2- high-tension shielding lead, 3- plugging plate, 4- current transformer, 5- wears round, 11- housing Ontology, 12- metal fixed block, 121- shielding line mounting hole, 122- plugging plate mounting hole.

Specific embodiment

Specific embodiment of the present utility model is described further with reference to the accompanying drawing, but is not limited thereto.

The specific embodiment 1 of current transformer, as shown in Figures 1 to 4, the current transformer include housing 1 and installation Plugging plate 3 on current transformer 4, plugging plate 3 and current transformer 4 are molded by epoxy resin, epoxy resin Also there is preferable impact resistance, since material is identical, two after the installation of plugging plate 3 while with good insulation performance Person seems one, more beautiful, and plugging plate 3, which is equipped with, wears round 5 for busbar connector plug.Housing 1 includes by metal material Expect housing ontology 11 made of T2 copper sheet, has the gold made of T2 copper sheet using phosphor-copper Welding on housing ontology 11 Belong to fixed block 12, weld is polished after welding, there is it without wedge angle and welding slag.Whole housing 1 has good lead Electro ultrafiltration, in field distribution it is uniform, housing ontology 11 with a thickness of 1-3mm, metal fixed block 12 and housing ontology 11 welds are arc surface identical with circular diameter in housing ontology 11, and whole rounded corner at the arris of metal fixed block, In order to facilitate the intensity for welding and guaranteeing metal fixed block 12, metal fixed block 12 with a thickness of 5-10mm, metal fixed block 12 rest part mechanism will not make it cause point discharge.Parallel arrangement has plugging plate mounting hole on metal fixed block 12 122 and shielding line mounting hole 121, and the two Kong Douwei threaded holes, convenient for installing for fastener.It is poured in current transformer 4 When injection forming, groove structure is set in core pulling or an independent core pulling above and below current transformer mold, can be efficiently used at this time 122) mounting hole 121(on metal fixed block 12 is fixed on mould core pulling by fastener, enable housing 1 at The position in current transformer 4 after type is placed in the middle, does not have any deflection situation, so that the shield effectiveness of current transformer 4 reaches To best.By the shielding line mounting hole 121 on metal fixed block 12, high-voltage shielding line 2 can be easily connected, in housing 1 On due to making its excellent electric properties and stabilization without other redundant structures.

Current transformer 4 after molding in use, if be mounted on the side plate of switchgear, using shielding Plugging plate mounting hole 122 on set 1, the plugging plate 3 of the purposive suitable buss bar dimensions of selection, such setting avoid Aperture is carried out on current transformer 4, not destroying the structure of current transformer 4, effective solution current transformer 4 is not changing To the requirement of creepage distance on the basis of shape size, and the influence to insulation performance；Also reach in the prior art simultaneously To the requirement that current transformer 4 blocks, the sundries such as micronic dust effectivelying prevent in environment gather from the entrance from round of wearing of mutual inductor In mutual inductor surface or switchgear, so that mutual inductor decreasing insulating, so that the normal operation to power equipment causes Some potential safety problems.

The embodiment 2 of the current transformer, the difference with above-described embodiment 1 are: the metal fixed block 12 is shielding Cover ontology 11 in be equipped with 3, and two of them metal fixed block formed central angle be 60 °, another metal firmware fastly with The central angle that above-mentioned two metal fixed block is formed is respectively 150 °.

The embodiment 3 of the current transformer, the difference with above-described embodiment 1 are: the metal fixed block 12 is shielding Left and right sides is respectively symmetrically equipped with 2 in set ontology 11, and the central angle formed between two metal fixed blocks 12 of every side is 60°。

The embodiment 4 of current transformer, the embodiment and the difference of above-described embodiment 1 are that the plugging plate 3 is equipped with Mounting hole, the underface for the plugging plate mounting hole 122 which is arranged on the metal fixed block 12, and the mounting hole Diameter is greater than the diameter of the plugging plate mounting hole 122, avoids the plugging plate mounting hole 122 on metal fixed block 12 and blocks Deviations existing for mounting hole on plate 3 and causing, which are unfavorable for blocking the fixed situation of cover board, to be occurred.

Claims (5)

1. one end of a kind of current transformer, including bus casing, the bus casing is connect with cabinet body, the bus casing The other end is equipped with plugging plate, and the current transformer further includes housing, it is characterised in that: the housing includes housing sheet Body and on the inside of housing ontology, at least two fixed structures to extend internally are fixed at, the fixed structure is equipped with The axis of at least one through-hole, the axis and housing ontology of the through-hole is parallel to each other, constitute for install plugging plate and/or The mounting hole of shielding line, at least one described through-hole constitute the positioning for the core pulling location fit with mutual-inductor mould simultaneously Hole.

2. current transformer according to claim 1, it is characterised in that: the through-hole is threaded hole.

3. current transformer according to claim 1, it is characterised in that: the housing ontology and the fixed structure are It is made of metal material.

4. current transformer according to claim 1 or 2 or 3, it is characterised in that: whole at the arris of the fixed structure Rounded corner, fixed structure are cambered surface identical with circular diameter in housing ontology with housing ontology junction.

5. current transformer according to claim 1 or 2 or 3, it is characterised in that: the fixed structure is around housing ontology Axis be evenly arranged.