CN213752255U

CN213752255U - Current transformer for metering

Info

Publication number: CN213752255U
Application number: CN202023209668.7U
Authority: CN
Inventors: 黄志军; 张灿
Original assignee: Meiyi Electric Co ltd
Current assignee: Meiyi Electric Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-07-20
Anticipated expiration: 2030-12-28

Abstract

The application provides a current transformer for metering, which comprises a transformer body and a mounting seat; the mounting seat is provided with a mounting plane and a butt joint boss; an inward-concave socket is arranged on the butt joint boss; the mutual inductor body is provided with a matched butt joint groove corresponding to the butt joint boss; the bottom of the butt joint groove is provided with a matched conductive inserted rod corresponding to the socket, and the inner wall of the butt joint groove is provided with an insulating layer. According to the technical scheme that this application embodiment provided, can accomplish the butt joint of mutual-inductor body and mount pad through butt joint boss and butt joint groove, make mutual-inductor body and mount pad centre gripping on the outer wall of gas tank, the rethread socket has reached the effect that high pressure is all insulating again when having realized good electric conductivity with the butt joint cooperation insulating layer of electrically conductive inserted bar.

Description

Current transformer for metering

Technical Field

The application relates to the technical field of high-voltage metering, in particular to a current transformer for metering.

Background

The mutual inductor reduces the alternating voltage and the large current to the value which can be directly measured by the instrument according to the proportion, is convenient for the direct measurement of the instrument and provides power for relay protection and automatic devices. The mutual inductor for power system is a special transformer for transmitting the information of high voltage and large current of power network to the metering and measuring instrument and relay protection of low voltage and small current secondary side and automatic equipment. The mutual inductor is matched with the measuring instrument and the metering device, and can measure the voltage, the current and the electric energy of a primary system; and the device can be matched with a relay protection device and an automatic device to form electric protection and automatic control on various faults of a power grid. The performance of the mutual inductor directly influences the accuracy of measurement and metering of the power system and the reliability of the action of the relay protection device. Therefore, the mutual inductor has high requirements on precision and reliability, and the power grid metering requirements are gradually improved along with the gradual improvement of a power system. The accuracy of low voltage metering has not met the requirements of existing power systems, and high voltage metering is gradually being recognized by power systems. However, the existing metering transformer of the high-voltage system is greatly influenced by environmental factors, and has poor safety and high risk.

Disclosure of Invention

In view of the above-mentioned deficiencies or inadequacies in the prior art, it would be desirable to provide a current transformer for metering.

The application provides a current transformer for metering, which comprises a transformer body and a mounting seat; the mounting seat is provided with a mounting plane and a butt joint boss; an inward-concave socket is arranged on the butt joint boss; the mutual inductor body is provided with a matched butt joint groove corresponding to the butt joint boss; the bottom of the butt joint groove is provided with a matched conductive inserted rod corresponding to the socket, and the inner wall of the butt joint groove is provided with an insulating layer.

Furthermore, a shielding net is also arranged in the mounting seat; the shielding net is arranged around the socket.

Further, the mounting base is connected with the mutual inductor body through a bolt; the edge of the mounting seat is provided with corresponding mounting holes corresponding to the bolts.

Further, the device also comprises a sealing ring; the sealing ring is positioned between the mounting seat and the mutual inductor body; the mounting plane is provided with corresponding mounting grooves corresponding to the sealing rings; the mounting groove is located between mounting hole and the shielding net.

Furthermore, the socket is connected with the conductive insertion rod through a spring contact.

Further, the insulating layer is a silicone rubber sleeve.

The application has the advantages and positive effects that:

according to the technical scheme, the mutual inductor body and the mounting seat can be butted through the butt joint boss and the butt joint groove, so that the mutual inductor body and the mounting seat are clamped on the outer wall of the gas box, and the high-voltage full-insulation effect is achieved while good conductivity is achieved through the socket and the butt joint matching insulating layer of the conductive insertion rod.

Furthermore, the sealing ring is arranged on the mounting plane, so that the sealing problem that the air box is located at the mounting seat can be effectively solved.

Furthermore, the surface of the sealing ring is coated with insulating lubricating silicone grease to fill air gaps, so that the purpose of high-voltage insulation is achieved.

Furthermore, the whole transformer is formed by pouring epoxy resin, and the high-voltage electrified part is completely sealed in the epoxy resin, so that high-voltage full insulation is realized.

Drawings

Fig. 1 is a schematic structural diagram of a current transformer for metering according to an embodiment of the present application.

The text labels in the figures are represented as: 100-a transformer body; 110-docking slot; 120-conductive plugs; 121-spring contact; 130-an insulating layer; 200-a mounting seat; 210-docking boss; 220-a socket; 230-a shielding mesh; 240-bolt; 250-a sealing ring; 300-air box.

Detailed Description

The following detailed description of the present application is given for the purpose of enabling those skilled in the art to better understand the technical solutions of the present application, and the description in this section is only exemplary and explanatory, and should not be taken as limiting the scope of the present application in any way.

Referring to fig. 1, the present embodiment provides a current transformer for metering, which includes a transformer body 100 and a mounting base 200; the mounting seat 200 is provided with a mounting plane attached to the inner wall of the air box 300, the mounting plane is provided with a butt joint boss 210 penetrating through the air box 300, the boss 210 is provided with an inward concave socket 220, and the socket 220 is arranged along the direction vertical to the mounting plane; the mutual inductor body 100 is positioned outside the air box 300, and a butt joint groove 110 is arranged corresponding to the butt joint boss 210; the bottom of the docking slot 110 is provided with a conductive insertion rod 120 which is connected with the socket 220 in a plugging manner, and the inner wall of the docking slot is provided with an insulating layer 130.

In a preferred embodiment, the transformer body 100 is formed by pouring epoxy resin, and the high-voltage live part is completely sealed in the epoxy resin, so that high-voltage full insulation is realized.

In a preferred embodiment, the insulating layer 130 may be a silicone rubber sleeve.

In a preferred embodiment, a shielding mesh 230 is further disposed in the mounting base 200, and the shielding mesh 230 is disposed around the socket 220.

In a preferred embodiment, the mounting base 200 is connected with the transformer body 100 by bolts 240; mounting holes for bolts 240 to pass through are formed at the edges of the mounting base 200 and the transformer body 100.

In a preferred embodiment, a sealing ring 250 is further installed between the installation plane and the box body 300, and a matching installation groove is formed on the installation plane corresponding to the sealing ring 250; the mounting groove is positioned between the mounting hole and the shielding net 230; the air gap filling is realized by coating insulating lubricating silicone grease on the surface of the sealing ring, so that the purpose of high-voltage insulation is achieved.

In a preferred embodiment, the socket 220 and the conductive rod 120 can be connected by a spring contact 121, or can be connected by a tulip contact, so as to achieve complete contact and good conductivity.

The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention in other contexts without modification may be viewed as within the scope of the present application.

Claims

1. A current transformer for metering is characterized by comprising a transformer body (100) and a mounting seat (200); the mounting seat (200) is provided with a mounting plane and a butt joint boss (210); an inwards concave socket (220) is arranged on the butt joint boss (210); a matched butt joint groove (110) is formed in the mutual inductor body (100) corresponding to the butt joint boss; the bottom of the butt joint groove (110) is provided with a matched conductive inserted rod (120) corresponding to the socket (220), and the inner wall of the butt joint groove is provided with an insulating layer (130).

2. The metering current transformer according to claim 1, characterized in that a shielding net (230) is further arranged in the mounting seat (200); the shielding mesh (230) is disposed around the receptacle (220).

3. The metering current transformer of claim 2, wherein the mounting base (200) is connected with the transformer body (100) by a bolt (240); corresponding mounting holes are formed in the edge of the mounting base (200) corresponding to the bolts (240).

4. The metering current transformer of claim 3, further comprising a seal ring (250); the sealing ring (250) is positioned between the mounting seat (200) and the transformer body (100); a corresponding mounting groove is formed in the mounting plane corresponding to the sealing ring (250); the mounting groove is located between the mounting hole and a shielding net (230).

5. The metering current transformer of claim 1, wherein the socket (220) is connected to the conductive plunger (120) by a spring contact (121).

6. The metering current transformer of claim 1, wherein the insulating layer (130) is a silicone rubber sleeve.