CN215417841U

CN215417841U - Zero sequence transformer core penetrating structure

Info

Publication number: CN215417841U
Application number: CN202120708914.9U
Authority: CN
Inventors: 付正刚; 盛浩
Original assignee: Zhenlan Electric Shanghai Co ltd
Current assignee: Zhenlan Electric Shanghai Co ltd
Priority date: 2021-04-07
Filing date: 2021-04-07
Publication date: 2022-01-04
Anticipated expiration: 2031-04-07

Abstract

The utility model discloses a zero sequence transformer feed-through structure, which is characterized in that: the transformer comprises a zero sequence transformer, an A phase connection plate, an insulation plug, a B phase connection plate, a C phase connection plate, an N phase connection plate and a surrounding shell, wherein the A phase connection plate, the B phase connection plate, the C phase connection plate and the N phase connection plate penetrate through the zero sequence transformer and the surrounding shell, a separation cavity which is mutually separated and used for containing each phase connection plate is arranged inside the surrounding shell, the insulation plug is connected and matched with the surrounding shell, a containing cavity is arranged in the insulation plug, and the containing cavity is arranged on the periphery of the separation cavity and used for insulating the phase of each phase connection plate at the penetrating and collecting position. The zero sequence transformer core-penetrating interphase insulation mode is optimized, the insulation mode of winding an insulation tape is cancelled, and the risk of interphase breakdown of each connecting plate at the core-penetrating convergence position is avoided; the core penetrating process of the zero sequence transformer is simplified, and the production cost of the circuit breaker is reduced.

Description

Zero sequence transformer core penetrating structure

Technical Field

The utility model relates to a zero sequence mutual inductor feed-through structure, and belongs to the field of circuit protection.

Background

The residual current operated circuit breaker is a circuit breaker used for a low-voltage distribution network, and protects circuits and equipment from being damaged by faults such as overload, short circuit and residual current, so that the safety of a power grid and the equipment is ensured.

The zero sequence transformer is used as a detection module of the residual current operated circuit breaker, and whether residual current exists in the circuit is judged by utilizing the principle of phase current vector sum balance of each phase. The current of each phase of the circuit breaker needs to pass through the zero sequence transformer, so that the electric clearance at the collection position of each connecting plate is insufficient, and the interphase breakdown is easily caused. For the above reasons, when each phase connection plate passes through the zero sequence transformer, the insulation performance between each phase connection plate must be considered.

The existing zero sequence transformer feed-through structure is usually formed by winding an insulating tape on each connecting plate, but has the following problems:

firstly, the winding of the insulating tape has certain requirements on assembly staff, and if the insulating tape is not wound in place, a user has the risk of interphase breakdown in the using process.

Secondly, the production cost of the circuit breaker is increased, and firstly, the material cost of the insulating tape is higher; and secondly, the winding of the insulating tape is time-consuming, and the process cost is relatively high.

Disclosure of Invention

The technical problem to be solved by the utility model is as follows: the insulation mode of the existing zero sequence transformer feed-through structure is high in cost and has the problem of breakdown risk in the using process.

In order to solve the above problems, the technical scheme of the present invention is to provide a zero sequence transformer feedthrough structure, which is characterized in that: the transformer comprises a zero sequence transformer, an A phase connection plate, an insulation plug, a B phase connection plate, a C phase connection plate, an N phase connection plate and a surrounding shell, wherein the A phase connection plate, the B phase connection plate, the C phase connection plate and the N phase connection plate penetrate through the zero sequence transformer and the surrounding shell, a separation cavity which is mutually separated and used for containing each phase connection plate is arranged inside the surrounding shell, the insulation plug is connected and matched with the surrounding shell, a containing cavity is arranged in the insulation plug, and the containing cavity is arranged on the periphery of the separation cavity and used for insulating the phase of each phase connection plate at the penetrating and collecting position.

Preferably, the separation cavity comprises a first separation cavity for accommodating the A-phase connecting plate, a second separation cavity for accommodating the C-phase connecting plate and a third separation cavity for accommodating the N-phase connecting plate, and the first separation cavity, the second separation cavity and the third separation cavity are separated from each other.

Preferably, an I-shaped gap is formed between the first separation cavity and the second separation cavity.

Preferably, the insulating plug is in plug connection with the surrounding shell.

Preferably, the containing cavity comprises a first containing cavity and a second containing cavity, the first containing cavity and the second containing cavity are formed by inward protruding I-shaped structures of insulating plugs, and the I-shaped structures and the I-shaped gaps are matched to insulate the connecting plates at the crossing and gathering positions.

Compared with the prior art, the utility model has the beneficial effects that:

the zero sequence transformer core-penetrating interphase insulation mode is optimized, the insulation mode of winding an insulation tape is cancelled, and the risk of interphase breakdown of each connecting plate at the core-penetrating convergence position is avoided; the core penetrating process of the zero sequence transformer is simplified, and the production cost of the circuit breaker is reduced.

Drawings

Fig. 1 is a schematic diagram of a zero sequence transformer feedthrough structure according to the present invention;

FIG. 2 is a schematic view of a wrap-around housing configuration;

FIG. 3 is a schematic view of an insulation plug structure;

FIG. 4 is a schematic diagram of the insertion of the surrounding shell and the insulating plug;

fig. 5 is a sectional view of fig. 4 in the direction of the arrows.

Detailed Description

In order to make the utility model more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 5, the zero sequence transformer feedthrough structure of the present invention includes a zero sequence transformer 1, an a-phase connection plate 2, an insulation plug 3, a B-phase connection plate 4, a C-phase connection plate 5, an N-phase connection plate 6, and a surrounding shell 7. The A-phase connecting plate 2, the B-phase connecting plate 4, the C-phase connecting plate 5 and the N-phase connecting plate 6 penetrate through the zero sequence transformer 1 and the surrounding shell 7, mutually separated separating cavities for containing the connecting plates are machined in the surrounding shell 7, each separating cavity comprises a first separating cavity 71 for containing the A-phase connecting plate 2, a second separating cavity 72 for containing the C-phase connecting plate 5 and a third separating cavity 73 for containing the N-phase connecting plate, the first separating cavity 71, the second separating cavity 72 and the third separating cavity 73 are mutually separated, and an I-shaped gap is formed between the first separating cavity 71 and the second separating cavity 72.

A containing cavity is processed in the insulating plug 3 and comprises a first containing cavity 31 and a second containing cavity 32, and the first containing cavity 31 and the second containing cavity 32 are formed by inward protruding I-shaped structures of the insulating plug 3. The insulating plug 3 is connected with the surrounding shell 7 in an inserting mode, the I-shaped structure is matched with the I-shaped gap, the first separation cavity 71 is inserted into the second containing cavity 32, the second separation cavity 72 is inserted into the first containing cavity 31, the first separation cavity and the second separation cavity form an opposite insertion structure, all the connecting plates are completely isolated, and the interphase insulation of all the connecting plates at the penetrating and collecting position is achieved.

The utility model mainly comprises the design of a surrounding shell and an insulating plug, wherein the surrounding shell and the insulating plug are in a mutual insertion structure. The surrounding shell comprises a group of separation cavities which contain and separate the connecting plates of the circuit breaker, and then an insulating plug is inserted into the surrounding shell to completely separate the connecting plates, so that the insulation of the connecting plates is realized.

The utility model cancels the insulation mode of winding the insulation tape, has simple assembly mode, and greatly reduces the core penetrating cost of the zero sequence transformer under the condition of ensuring the phase insulation performance of each connecting plate.

Claims

1. The utility model provides a zero sequence transformer structure of punching which characterized in that: the connecting device comprises a zero sequence transformer (1), an A-phase connecting plate (2), an insulating plug (3), a B-phase connecting plate (4), a C-phase connecting plate (5), an N-phase connecting plate (6) and a surrounding shell (7), wherein the A-phase connecting plate (2), the B-phase connecting plate (4), the C-phase connecting plate (5) and the N-phase connecting plate (6) penetrate through the zero sequence transformer (1) and the surrounding shell (7), mutually separated separating cavities for containing the connecting plates are formed in the surrounding shell (7), the insulating plug (3) is connected and matched with the surrounding shell (7), a wrapping cavity is formed in the insulating plug (3), and the wrapping cavity is formed in the periphery of the separating cavities and used for insulating the phase of the connecting plates at the penetrating and collecting positions.

2. The zero sequence transformer feedthrough structure of claim 1, wherein: the separation cavity comprises a first separation cavity (71) used for accommodating the A-phase connecting plate (2), a second separation cavity (72) used for accommodating the C-phase connecting plate (5) and a third separation cavity (73) used for accommodating the N-phase connecting plate, and the first separation cavity (71), the second separation cavity (72) and the third separation cavity (73) are separated from each other.

3. The zero sequence transformer feedthrough structure of claim 2, wherein: an I-shaped gap is formed between the first separation cavity (71) and the second separation cavity (72).

4. The zero sequence transformer feedthrough structure of claim 1, wherein: the insulating plug (3) is connected with the surrounding shell (7) in an inserting mode.

5. The zero sequence transformer feedthrough structure of claim 1, wherein: the containing cavity comprises a first containing cavity (31) and a second containing cavity (32), the first containing cavity (31) and the second containing cavity (32) are formed by inward protruding I-shaped structures of insulating plugs (3), and the I-shaped structures and the I-shaped gaps are matched to insulate the connecting plates at the crossing and gathering positions.