WO2023207206A1

WO2023207206A1 - Current transformer comprising built-in contact box

Info

Publication number: WO2023207206A1
Application number: PCT/CN2022/144406
Authority: WO
Inventors: 张涛; 张海涛; 姚丽敏
Original assignee: 镇江市丹高电器有限公司
Priority date: 2022-04-25
Filing date: 2022-12-31
Publication date: 2023-11-02
Also published as: CN217134190U

Abstract

A current transformer comprising a built-in contact box. A current transformer and a contact box are provided in a transformer shell (1); the current transformer is provided on the left side of the interior of the transformer shell (1); the contact box is provided on the right side of the interior of the transformer shell (1); and the contact box is connected to the current transformer by means of a contact socket (8). By optimizing the designing of secondary coil hoisting, the technical problems that the internal space of the contact box is limited, and the insulation distance of a primary coil and a secondary coil of a built-in transformer is limited are solved.

Description

A current transformer with built-in contact box

Technical field

The utility model belongs to the technical field of current transformers, and specifically relates to a current transformer with a built-in contact box.

Background technique

With the rapid development of domestic urban construction, every housing project, commercial building and company factory building has sprung up like mushrooms after a rain, and the supporting power supply equipment is indispensable. With the development of miniaturization and intelligence of switch cabinets, , the original KYN28 high-voltage cabinet in the mid-mounted cabinet was gradually eliminated from the market, and was replaced by a miniaturized 550 mid-mounted cabinet. In order to achieve this miniaturization design purpose, the main electrical components must be matched within the cabinet. The corresponding optimized design keeps its size within the size range of 550*1450*2200, achieving features such as land saving, energy saving, consumption reduction, and easy maintenance.

shortcomings of existing products on the market;

The round KYN28 mid-mounted cabinet power supply unit is connected by busbars, connected in series by copper bars, and is supported by contact box insulation. There is no current transformer at the bottom. The internal space of the cabinet is large, and the power distribution room occupies a large area.

Once the copper bar is connected to the contact box in series, due to the air gap between the contact box and the copper bar, flash and penetration often occur internally.

Utility model content

The utility model belongs to a current transformer with a built-in contact box. A current transformer and a contact box are provided inside the transformer housing. A current transformer is provided on the left side of the transformer housing. The transformer housing There is a contact box on the right side of the interior. The contact box is connected to the current transformer through the contact socket. Due to the limited internal space of the contact box, the insulation distance between the primary coil and the secondary coil of the built-in transformer is greatly affected. By optimizing the design plan, a breakthrough was found in the secondary coil hoisting, thereby solving this difficulty.

Furthermore, the shape of the transformer housing is a ladder type, the left side of the transformer housing is in the shape of a rectangular cube, the right side of the transformer housing is in the shape of a cylinder, and a transformer slot is provided at the bottom of the left end of the transformer housing. The outer right part of the shell is equipped with a contact outer latch. In the original center cabinet contact box, due to the air gap between the primary copper bar and the contact box, the partial discharge level could not be solved. Now the primary coil and the secondary coil surround it. In the contact box, through primary and secondary coil shielding, the partial discharge level can be controlled below 5pc.

Furthermore, the current transformer includes a mutual inductance core, a mutual inductance coil and a mutual inductor port. A mutual inductance coil is provided outside the mutual inductance core, and the mutual inductance core and the mutual inductance coil are located on the inner left side of the transformer housing. The transformer port is located in the transformer slot, the transformer port is connected to the mutual inductance core, and the mutual inductance core is connected to the contact box.

Furthermore, the contact box includes a contact cavity, a tenon inside the contact, a waterproof ring for the contact and a contact socket. The shape of the contact cavity is a cylindrical opening, and the contact cavity is located on the right side of the transformer housing. Inside the side of the contact cavity, there is a contact socket at the left end of the contact cavity, a contact inner latch above the left end of the contact cavity, and a contact waterproof ring inside the right side of the contact cavity. The secondary tenon ensures that the contact head can be more securely positioned in the contact box, and a waterproof ring is added to ensure the overall waterproof performance of the contact head.

Furthermore, the shape of the transformer slot is a rectangular opening slot, and the opening of the transformer slot is located at the left end and bottom of the transformer housing. The shape of the outer tenon of the contact is a ring, and the outer tenon of the contact is a ring. The right end is equipped with an external clamping tongue and groove.

Furthermore, the shape of the inner latch of the contact is rectangular, and the top of the inner latch of the contact is provided with an inner latch groove. The shape of the contact waterproof ring is annular, and several contact waterproof rings are arranged at equal intervals. Right side of the contact cavity.

Furthermore, the contact socket is connected to the mutual induction core, and now the primary and secondary coils are surrounded in the contact box and shielded by the primary and secondary coils.

beneficial effects

Due to the limited internal space of the contact box, the insulation distance between the primary coil and the secondary coil of the built-in transformer is greatly restricted. By optimizing the design scheme, a breakthrough was found in the hoisting of the secondary coil, thus solving this difficulty. In the original mid-mounted cabinet contact box, due to the air gap between the primary copper bar and the contact box, the partial discharge level could not be solved. Now the primary coil and secondary coil are surrounded in the contact box and are shielded by the primary and secondary coils. , the partial discharge level can be controlled below 5pc.

Description of the drawings

Figure 1 is a schematic cross-sectional view of a current transformer with a built-in contact box;

In the picture; 1. Transformer shell, 2. Contact chamber, 3. Mutual induction core, 4. Mutual induction coil, 5. Contact outer latch, 6. Contact waterproof ring, 7. Contact inner latch, 8. Contact socket, 9. Transformer port.

Detailed ways

In order to deepen the understanding of the present utility model, the present utility model will be further described in detail below with reference to the embodiments and drawings. The embodiments are only used to explain the present utility model and do not constitute a limitation on the protection scope of the present utility model.

Transformer housing 1, contact cavity 2, mutual induction core 3, mutual induction coil 4, contact outer latch 5, contact waterproof ring 6, contact inner latch 7, contact socket 8, transformer port 9.

As shown in Figure 1;

A current transformer with a built-in contact box. A current transformer and a contact box are provided inside the transformer housing 1. A current transformer is provided on the left side of the transformer housing 1. A current transformer is provided inside the transformer housing 1. There is a contact box on the right side. The contact box is connected to the current transformer through the contact socket. Due to the limited internal space of the contact box, the insulation distance between the primary coil and the secondary coil of the built-in transformer is greatly affected. Limitation, by optimizing the design scheme, a breakthrough was found in the secondary coil hoisting, thus solving this difficulty.

In this implementation example, the shape of the transformer housing 1 is stepped, the left side of the transformer housing 1 is in the shape of a rectangular cube, the right side of the transformer housing 1 is in the shape of a cylinder, and the left end of the transformer housing 1 is provided with a mutual inductor at the bottom. The outer right part of the transformer shell 1 is provided with a contact outer latch 5. In the original center cabinet contact box, due to the air gap between the primary copper bar and the contact box, the partial discharge level could not be solved. Now the primary coil and secondary coil are surrounded in the contact box. Through the shielding process of the primary and secondary coils, the partial discharge level can be controlled below 5pc.

In this implementation example, the current transformer includes a mutual inductance core 3, a mutual inductance coil 4 and a transformer port 9. The mutual inductance core 3 is provided with a mutual inductance coil 4 outside the mutual inductance core 3. The mutual inductance core 3 and the mutual inductance coil 4 are provided in the transformer. On the inner left side of the housing 1, the transformer port 9 is located in the transformer slot. The transformer port 9 is connected to the mutual inductance core 3, and the mutual inductance core 3 is connected to the contact box.

In this embodiment, the contact box includes a contact cavity 2, a contact inner latch 7, a contact waterproof ring 6 and a contact socket 8. The contact cavity 2 is in the shape of a cylindrical opening. 2 is located inside the right side of the transformer housing 1. There is a contact socket 8 at the left end of the contact cavity 2. There is a contact inner latch 7 above the left end of the contact cavity 2. There is a contact socket 7 inside the right side of the contact cavity 2. The head waterproof ring 6 ensures that the contact head in the contact box can be more securely positioned by placing a secondary latch in the contact chamber 2, and the waterproof ring is added to ensure the overall waterproof performance of the contact.

In this implementation example, the shape of the transformer slot is a rectangular opening slot, and the opening of the transformer slot is located at the left end and bottom of the transformer housing 1. The shape of the outer tenon 5 of the contact is a ring. The right end of the outer locking tenon 5 of the head is provided with an outer locking tenon groove.

In this embodiment, the shape of the inner latch 7 of the contact is rectangular, and the top of the inner latch 7 of the contact is provided with an inner latch groove. The shape of the contact waterproof ring 6 is annular, and the contact waterproof ring 6 is equidistant. There are several on the right side of the contact cavity 2.

In this implementation example, the contact socket 8 is connected to the mutual induction core 3. Now the primary coil and the secondary coil are surrounded in the contact box and shielded by the primary and secondary coils.

Implementation examples;

When the device is in use, connect the connector to the transformer port 9, insert the contact into the contact cavity 2, and tighten the inner and outer tenons of the contact cavity 2 to complete the assembly of the device and ensure the integration of the device. It also reduces the size, improves the integrity and improves the waterproofing capability.

The above descriptions are only preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in within the protection scope of this utility model.

Claims

A current transformer with a built-in contact box, characterized in that a current transformer and a contact box are provided inside the transformer housing, and a current transformer is provided on the left side of the transformer housing. The transformer housing There is a contact box on the right side of the interior, and the contact box is connected to the current transformer through the contact socket.
A current transformer with a built-in contact box according to claim 1, characterized in that the shape of the transformer housing is a stepped shape, the left side of the transformer housing is in the shape of a rectangular cube, and the right side of the transformer housing is in the shape of a rectangular cube. The side shape is cylindrical, the left end bottom of the transformer housing is provided with a transformer slot, and the outer right part of the transformer housing is provided with a contact outer latch.
A current transformer with a built-in contact box according to claim 2, characterized in that the current transformer includes a mutual inductance core, a mutual inductance coil and a mutual inductor port, and a mutual inductance is provided outside the mutual inductance core. The coil, the mutual inductance core and the mutual inductance coil are located on the inner left side of the transformer housing. The transformer port is located in the transformer slot. The transformer port is connected to the mutual inductance core. The mutual inductance core is connected to the contactor. The head box is connected.
A current transformer with a built-in contact box according to claim 3, characterized in that the contact box includes a contact cavity, a contact inner latch, a contact waterproof ring and a contact socket, and the The shape of the contact cavity is a cylindrical opening. The contact cavity is located inside the right side of the transformer housing. There is a contact socket at the left end of the contact cavity. There is a contact inner latch above the left end of the contact cavity. There is a contact waterproof ring inside the right side of the cavity.
A current transformer with a built-in contact box according to claim 2, characterized in that the shape of the transformer slot is a rectangular opening slot, and the opening of the transformer slot is located at the left end of the transformer housing. and the bottom, the outer latch of the contact is in the shape of a ring, and the right end of the outer latch of the contact is provided with an outer latch groove.
A current transformer with a built-in contact box according to claim 4, characterized in that the shape of the inner latch of the contact is a rectangle, and the top of the inner latch of the contact is provided with an inner latch groove, and the The shape of the contact waterproof ring is annular, and there are several contact waterproof rings equidistantly located on the right side of the contact cavity.
A current transformer with a built-in contact box according to claim 4, characterized in that the contact socket is connected to a mutual inductance magnetic core.