CN209980946U

CN209980946U - Switch cabinet pluggable current transformer

Info

Publication number: CN209980946U
Application number: CN201921136309.8U
Authority: CN
Inventors: 张若雷; 耿直; 宋继新
Original assignee: SHENYANG HIGH VOLTAGE COMPLETE SWITCHGEAR Co Ltd
Current assignee: SHENYANG HIGH VOLTAGE COMPLETE SWITCHGEAR Co Ltd
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2020-01-21
Anticipated expiration: 2029-07-19

Abstract

A pluggable current transformer of a switch cabinet relates to the field of switch cabinets. This current transformer, at plug-in type wiring mouth outer wall, the mutual-inductor body surface between plug-in type wiring mouth and mounting panel increases the shirt rim respectively, the while has increased the lateral wall boss at mutual-inductor primary coil terminal, these structures have increased creepage distance between plug-in type wiring mouth and the mounting panel respectively and have adjacent creepage distance between electrified body and the electrified body of non-and the cabinet body metal sheet, be favorable to reducing between mutual-inductor and the mutual-inductor, and be used for installation distance between the cabinet body metal sheet, make installation distance compacter between the component, for equipment miniaturization, the compactification provides effectual solution. The current transformer can be conveniently matched with the contact box for use through the plug-in type wiring port, and the purpose of enabling elements to be closely matched and shortening the installation distance of the elements is achieved.

Description

Switch cabinet pluggable current transformer

Technical Field

The utility model relates to a high tension switchgear field, in particular to cubical switchboard grafting current transformer.

Background

With the wider application of power equipment, the requirements for miniaturization, compactness and safety are higher and higher. The switch cabinets are also increasingly compact and small, and the most representative of the switch cabinets are gas insulated cabinets, solid insulated cabinets and the like. The more compact the arrangement of elements in the switch cabinet is, the more closely the charged gaps in the national standard are met, and simultaneously, the elements in the cabinet are tightly connected. The current transformer is manufactured into a pluggable type and is matched with the pluggable contact box for use, the requirement of live clearance is met, the distance between the transformer and the contact box is shortened, and the installation working hour is saved.

Disclosure of Invention

The utility model aims at providing a cubical switchboard can peg graft current transformer to the not enough of prior art existence.

The utility model adopts the technical proposal that: a switch cabinet pluggable current transformer comprises a transformer body poured by epoxy resin, and is characterized in that a primary coil and a secondary coil are arranged in the transformer body, the secondary coil is sleeved on the primary coil, the wire inlet end of the primary coil is led out from a plug-in type wiring port of the transformer body, the secondary coil is connected with a secondary wiring terminal through a secondary lead, and the wire outlet end of the primary coil is arranged at the lower end of the transformer body and is connected with the load side of a switch cabinet; the upper end of the mutual inductor body is provided with a plug-in type wiring port, and the outer wall of the plug-in type wiring port is provided with a skirt edge for increasing creepage distance; the mounting panel is connected to mutual-inductor body one side, also is equipped with the shirt rim of increase creepage distance on the mutual-inductor body surface between mounting panel and the plug-in type wiring mouth, is equipped with the lateral wall boss on the mutual-inductor body surface of the leading-out terminal of primary coil.

In the above scheme, the plug-in type wiring port is a cuboid.

The utility model has the advantages that: this cubical switchboard can peg graft current transformer, at plug-in type wiring mouth outer wall, the mutual-inductor body surface between plug-in type wiring mouth and mounting panel increases the shirt rim respectively, the lateral wall boss has been increased simultaneously at mutual-inductor primary coil leading-out terminal, these structures have increased creepage distance between plug-in type wiring mouth and the mounting panel respectively and creepage distance between adjacent electrified body and the non-electrified body and the cabinet body metal sheet, be favorable to reducing between mutual-inductor and the mutual-inductor, and be used for installation distance between the cabinet body metal sheet, make installation distance compacter between the component, for equipment miniaturization, the compactification provides effectual solution. The current transformer can be conveniently matched with the contact box for use through the plug-in type wiring port, and the purpose of enabling elements to be closely matched and shortening the installation distance of the elements is achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a front view of a switch cabinet pluggable current transformer in an embodiment of the present invention;

FIG. 2 is a right side view of FIG. 1;

FIG. 3 is a top view of FIG. 1

FIG. 4 is a bottom view of FIG. 1

FIG. 5 is a partial view of the side wall boss of the primary coil outlet terminal of FIG. 1

Fig. 6 is a schematic view of an installation structure of the pluggable current transformer and the pluggable contact box of the switch cabinet in this embodiment;

the numbers in the figure illustrate the following: 1 mutual-inductor body, 2 plug-in type wiring mouth, 3 primary coil, 31 primary coil inlet wire end, 32 primary coil outlet terminal, 4 secondary coil, 5 secondary lead wires, 6 secondary binding post, 7 mounting panel, 8 shirt rims, 9 lateral wall bosss, 10 plug-in type contact box.

Detailed Description

The above objects, features and advantages of the present invention will be more clearly understood and the present invention will be explained in more detail with reference to the accompanying drawings 1 to 6 and the detailed description thereof.

The switch cabinet pluggable current transformer adopted by the embodiment comprises a transformer body 1 with a pluggable wiring port 2 and an installation cavity, a primary coil 3, a primary coil wire inlet end 31, a primary coil wire outlet end 32, a secondary coil 4, a secondary lead 5 and a secondary wiring terminal 6, wherein the primary coil 3, the primary coil wire inlet end 31, the primary coil wire outlet end 32, the secondary coil 4, the secondary lead 5 and the secondary wiring terminal 6 are arranged in the transformer body 1, and one side of the transformer body 1 is in threaded connection with. The secondary coil 4 is sleeved on the primary coil 3, and the secondary wiring terminal 6 is connected with the secondary coil 4 through a secondary lead 5 and is formed by epoxy resin casting.

Plug-in type wiring mouth 2 in this embodiment is the cuboid, is located the upper end of mutual-inductor body 1, and plug-in type wiring mouth 2 outer wall is equipped with shirt rim 8. This embodiment also is equipped with crowd's limit 8 on mutual-inductor body 1 surface between plug-in type wiring mouth 2 and mounting panel 7, and skirt edge 8 multiplicable and mounting panel 7 live distance increases the creepage distance. The primary coil wire inlet end 31 is led out from the plug-in type wire connecting port 2, and the primary coil wire outlet end 32 is positioned at the right middle lower part of the mutual inductor body 1. On the mutual inductor body 1, the side wall boss 9 is additionally arranged at the position of a primary coil wire outlet end 32, the creepage distance between adjacent current mutual inductors and cabinet body metal plates and non-charged bodies is increased, discharging to other elements is prevented, the insulation distance between other elements is increased, the distance between element installation is shortened, the installation space is saved, and the operation is safe and reliable.

The pluggable current transformer in the embodiment can be matched with the plug-in contact box for use. The plug-in type outlet of contact box is pegged graft in the plug-in type wiring mouth that is located the mutual-inductor body upper end in this embodiment, and the primary lead wire of primary coil contacts with the static contact installation mold insert in the contact box for current transformer is connected with plug-in type contact box.

The working principle is as follows:

the current transformer capable of being plugged into the switch cabinet is characterized in that according to the electromagnetic induction principle, a large current flowing through a primary coil 3 is converted into a small current for measurement and protection through a secondary coil 4, the number of turns of the primary coil 3 is small, the number of turns of the secondary coil 4 is large, the primary coil 3 is connected in series in a main loop of the switch cabinet and receives a primary total current flowing through the switch cabinet, the current is different from dozens of amperes to tens of thousands of amperes, the small current is induced and converted through the secondary coil 4 and is supplied to a measuring instrument and a microcomputer protection device through a secondary lead wire 5 and a secondary connecting terminal 6, the current is generally several milliamperes to 5 amperes, the creepage distance is increased by a skirt edge 8, the protection effect of the insulation distance is increased, the creepage of the arc leakage from an inserting gap between the transformer and an inserting type contact box 10 is prevented, the creepage is delayed on the surface of an inserting connecting port 2 of the transformer, and the current, or the insulation distance to other parts when the transformer is used independently is prevented, so that the transformer is safe and reliable to operate.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A switch cabinet pluggable current transformer comprises a transformer body poured by epoxy resin, and is characterized in that a primary coil and a secondary coil are arranged in the transformer body, the secondary coil is sleeved on the primary coil, the wire inlet end of the primary coil is led out from a plug-in type wiring port of the transformer body, the secondary coil is connected with a secondary wiring terminal through a secondary lead, and the wire outlet end of the primary coil is arranged at the lower end of the transformer body and is connected with the load side of a switch cabinet; the upper end of the mutual inductor body is provided with a plug-in type wiring port, and the outer wall of the plug-in type wiring port is provided with a skirt edge for increasing creepage distance; the mounting panel is connected to mutual-inductor body one side, also is equipped with the shirt rim of increase creepage distance on the mutual-inductor body surface between mounting panel and the plug-in type wiring mouth, is equipped with the lateral wall boss on the mutual-inductor body surface of the leading-out terminal of primary coil.

2. The pluggable current transformer of claim 1, wherein the pluggable connection port is a rectangular parallelepiped.