CN209979723U

CN209979723U - Current transformer and pole-mounted switch

Info

Publication number: CN209979723U
Application number: CN201920424811.2U
Authority: CN
Inventors: 黎明; 张庆华
Original assignee: BEIJING MICROPOWER TECHNOLOGY Co Ltd
Current assignee: Micro energy Huitong (Liaoning) Power Technology Co.,Ltd.
Priority date: 2019-04-01
Filing date: 2019-04-01
Publication date: 2020-01-21
Anticipated expiration: 2029-04-01

Abstract

The utility model discloses a current transformer and column switch. Wherein, this current transformer includes: the transformer comprises a secondary body, an equipotential shielding cover of the body, an inner insulator, an outer insulating shell, a connecting port, a wiring contact pin and a shielding field equalizing ring, wherein the secondary body comprises a secondary winding and a transformer iron core; the secondary winding is wound on the transformer core, the secondary body is located in the body equipotential shield cover and connected with the body equipotential shield cover through a connecting line, the body equipotential shield cover is located in the outer insulating shell, an inner insulator is arranged between the body equipotential shield cover and the outer insulating shell, the connecting port is arranged on the outer insulating shell and comprises at least 2 wiring contact pins, and the shielding equal field ring is arranged in the wiring contact pins. The utility model provides a current transformer lead to the technical problem that circuit breaker partial discharge exceeds standard on the post easily.

Description

Current transformer and pole-mounted switch

Technical Field

The utility model relates to an electrical detection technical field particularly, relates to a current transformer and column switch.

Background

At present, along with the construction of a smart power grid, the standardization and integration degree of power distribution primary and secondary equipment is higher and higher, the transformer serving as an important component of the smart power grid should fully embody the characteristics and the requirements of high performance, low loss, safety, reliability and high fusion efficiency, and a primary and secondary fusion special current transformer, a voltage transformer, an electronic transformer and the like which are made of green and environment-friendly insulating materials with excellent performance are produced accordingly.

The method for manufacturing the primary and secondary fusion current transformer for the pole-mounted circuit breaker in the prior art comprises the following three modes, namely a mode of encapsulating a transformer body by epoxy resin vacuum casting, a mode of encapsulating the transformer body by insulating crepe paper, a glass fiber cloth belt and polyester film composite paper, a mode of manufacturing an inner insulator body by impregnating insulating paint, and a mode of encapsulating an insulating adhesive tape outside the transformer body; the transformer body is placed in the insulating shell and then is encapsulated with polyurethane material.

The above mode solves the problems of using and assembling the primary and secondary fusion current transformer for the pole-mounted circuit breaker with the switch to a certain extent, but has the following disadvantages: the mutual inductor does not take low partial discharge treatment measures, so that the integral partial discharge capacity of the on-column circuit breaker exceeds the standard after the mutual inductor is assembled with the on-column circuit breaker.

Aiming at the problem that the partial discharge of the on-pole circuit breaker exceeds the standard easily caused by the existing current transformer, an effective solution is not provided at present.

Disclosure of Invention

The embodiment of the utility model provides a current transformer and column switch to solve current transformer at least and lead to the technical problem that circuit breaker partial discharge exceeds standard on the column easily.

According to an aspect of an embodiment of the present invention, there is provided a current transformer, including a secondary body, an equipotential shield cover for the body, an inner insulator, an outer insulating casing, a connection port, a connection pin, and a shielding field equalizing ring, wherein the secondary body includes a secondary winding and a transformer core; the secondary winding is wound on the transformer core, the secondary body is located in the body equipotential shield cover and connected with the body equipotential shield cover through a connecting line, the body equipotential shield cover is located in the outer insulating shell, an inner insulator is arranged between the body equipotential shield cover and the outer insulating shell, the connecting port is arranged on the outer insulating shell and comprises at least 2 wiring contact pins, and the shielding equal field ring is arranged in the wiring contact pins.

Further, the material of the outer insulating shell is thermoplastic plastics, and the material of the thermoplastic plastics comprises at least one of the following materials: polyethylene, polyvinyl chloride, polypropylene, polystyrene, acrylonitrile-butadiene-styrene.

Furthermore, the inner insulator is formed by adopting epoxy resin sealing glue.

Further, the material of the transformer core comprises at least one of the following: cold rolled silicon steel strip, amorphous alloy, permalloy.

Further, the end face of the transformer core is processed in at least one of the following modes: epoxy curing, paint dipping and round corner guiding treatment.

Further, the material of the equipotential shielding case of the body comprises at least one of the following materials: conductive rubber, copper mesh, aluminum mesh, and semiconductor crepe paper.

Further, the material for shielding the field-equalizing ring comprises at least one of the following materials: conductive rubber, copper mesh, aluminum mesh, and semiconductor crepe paper.

Further, the shielding field equalizing ring is embedded in the wiring contact pin.

Further, the connection port is a low partial discharge connection port.

According to the utility model discloses an on the other hand still provides a column switch, including foretell current transformer.

The embodiment of the utility model provides an in, because the secondary ware body that secondary winding and mutual-inductor iron core constitute is located ware body equipotential shield cover, consequently formed effectual equipotential semiconductor wholly, in addition set up the connection port on the external insulation casing, can reach the technical effect who effectively reduces the partial discharge level, maintain electrical property to solved current mutual-inductor and leaded to the technical problem that circuit breaker partial discharge exceeds standard on the post easily.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

fig. 1 is a schematic structural diagram of a current transformer according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an alternative current transformer according to an embodiment of the present invention; and

fig. 3 is a schematic structural diagram of an alternative current transformer according to an embodiment of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

Example one

According to the embodiment of the utility model, a current transformer is provided, which comprises a secondary body, an equipotential shielding cover of the body, an inner insulator, an outer insulating shell, a connecting port, a wiring contact pin and a shielding field equalizing ring, wherein the secondary body comprises a secondary winding and a transformer iron core; the secondary winding is wound on the transformer core, the secondary body is located in the body equipotential shield cover and connected with the body equipotential shield cover through a connecting line, the body equipotential shield cover is located in the outer insulating shell, an inner insulator is arranged between the body equipotential shield cover and the outer insulating shell, the connecting port is arranged on the outer insulating shell and comprises at least 2 wiring contact pins, and the shielding equal field ring is arranged in the wiring contact pins.

Specifically, as shown in fig. 1, the following are sequentially performed from outside to inside: the transformer comprises an outer insulating shell 1, an inner insulator 2, a transformer body equipotential shielding case 3, a secondary winding 4 and a transformer iron core 5, wherein the secondary winding 4 is uniformly wound on the transformer iron core 5 to form a secondary transformer body, the inner insulator 2 is arranged between the outer insulating shell 1 and the transformer body equipotential shielding case 3, and the inner insulator 2 can be formed in a vacuum encapsulation mode.

As shown in fig. 2, a side position of the outer insulating housing 1 is provided with a connection port 6, the connection port 6 is used for being connected with a housing of an on-pole circuit breaker of an on-pole switch, as shown in fig. 3, the connection port 6 is provided with at least 2 connection pins 7, the connection pins 7 are used for a high-voltage bushing of the on-pole circuit breaker to pass through, and a shielding field equalizing ring 8 is arranged in the connection pins 7.

Specifically, the utility model discloses a current transformer's suitable scene includes but not limited to the circuit breaker uses once and twice fusion current transformer on the post.

In an alternative embodiment, as shown in fig. 3, the current transformer further includes a secondary shielding outlet 9, the secondary shielding outlet 9 is led out from the side of the outer insulating housing 1, and the secondary shielding outlet 9 may include a secondary shielding outlet plug having an open-circuit prevention function.

In an alternative embodiment, the material of the outer insulating shell is a thermoplastic, and the material of the thermoplastic comprises at least one of the following: polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), Polystyrene (PS), and Acrylonitrile Butadiene Styrene (ABS).

Specifically, current transformer is the mutual-inductor that encapsulates behind the insulating material dip coating, has the product operation a period after, and the vibration causes the insulating not hard up phenomenon of product, leads to product electrical property to descend, and dielectric strength reduces, takes place insulation breakdown's problem even, the utility model discloses a current transformer adopts the outer insulating casing that thermoplastic made, can regard as the insulating design mould of current transformer, and simple process manufacture, insulation thickness is unanimous, and the stable performance is reliable, shortens production cycle, reduces energy consumption, low carbon environmental protection, and electrical property is reliable and stable, and dielectric strength is high, can prevent to take place the problem of insulation breakdown.

In an alternative embodiment, the internal insulator is formed using an epoxy encapsulant.

Specifically, the internal insulator may be an epoxy resin internal insulator, specifically adopting a: the component B is prepared by pouring and sealing epoxy resin.

In an alternative embodiment, the material of the transformer core comprises at least one of the following materials according to different product purposes, accuracy grades and rated transformation ratios: cold rolled silicon steel strip, amorphous alloy, permalloy.

In an alternative embodiment, the end face of the transformer core is processed in at least one of the following ways: epoxy curing, paint dipping and round corner guiding treatment.

In an alternative embodiment, the material of the equipotential shield of the body comprises at least one of the following: conductive rubber, copper mesh, aluminum mesh, and semiconductor crepe paper.

In an alternative embodiment, the material shielding the field-equalizing ring comprises at least one of: conductive rubber, copper mesh, aluminum mesh, and semiconductor crepe paper.

In particular, the shield shimming ring may be a conductive or semiconductive material.

In an alternative embodiment, the shield shimming ring is embedded within the terminal pin.

Specifically, during the manufacturing process, the shielding uniform field ring can be embedded and fused in the wiring contact pin.

In an alternative embodiment, the connection port is a low partial discharge connection port.

Example two

Specifically, the pole top switch includes a pole top circuit breaker, which may be of the type zw20 pole top circuit breaker.

The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.

In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A current transformer is characterized by comprising a secondary transformer body, an equipotential shielding cover of the transformer body, an inner insulator, an outer insulating shell, a connecting port, a wiring contact pin and a shielding field equalizing ring, wherein the secondary transformer body comprises a secondary winding and a transformer iron core;

wherein, the secondary winding coiling is in on the mutual-inductor iron core, the secondary ware body is located in the ware body equipotential shield cover, the secondary ware body pass through the connecting wire with ware body equipotential shield cover is connected, ware body equipotential shield cover is located in the outer insulation casing, ware body equipotential shield cover with be provided with between the outer insulation casing interior insulator, connection port sets up on the outer insulation casing, connection port includes 2 at least the wiring contact pin, the equal field ring of shielding is set up in the wiring contact pin.

2. The current transformer of claim 1, wherein the material of the outer insulating housing is a thermoplastic comprising at least one of: polyethylene, polyvinyl chloride, polypropylene, polystyrene, acrylonitrile-butadiene-styrene.

3. The current transformer of claim 1, wherein the inner insulator is formed using an epoxy potting compound.

4. The current transformer of claim 1, wherein the material of the transformer core comprises at least one of: cold rolled silicon steel strip, amorphous alloy, permalloy.

5. The current transformer according to claim 1 or 4, characterized in that the end faces of the transformer core are treated in at least one of the following ways: epoxy curing, paint dipping and round corner guiding treatment.

6. The current transformer of claim 1, wherein the material of the body equipotential shield comprises at least one of: conductive rubber, copper mesh, aluminum mesh, and semiconductor crepe paper.

7. The current transformer of claim 1, wherein the material of the shielded shimming ring comprises at least one of: conductive rubber, copper mesh, aluminum mesh, and semiconductor crepe paper.

8. The current transformer of claim 1 or 7, wherein the shield shimming ring is embedded within the terminal pin.

9. The current transformer of claim 1, wherein the connection port is a low partial discharge connection port.

10. A pole switch comprising a current transformer according to any one of claims 1 to 9.