CN113972563B

CN113972563B - A primary conductive circuit structure of a miniaturized medium voltage switchgear

Info

Publication number: CN113972563B
Application number: CN202111427023.7A
Authority: CN
Inventors: 彭和敏; 付凯兴; 吴峰毅; 黄坚; 黄水庚; 符建; 陈召敬
Original assignee: Weisheng Energy Technology Co ltd
Current assignee: Weiyuan Energy Technology Co ltd
Priority date: 2021-11-28
Filing date: 2021-11-28
Publication date: 2025-06-13
Anticipated expiration: 2041-11-28
Also published as: CN113972563A

Abstract

The present invention discloses a primary conductive circuit structure of a miniaturized medium-voltage switch cabinet, including a busbar chamber in which the distance between busbar copper bars is not less than a specified air insulation safety distance through an adapter and a T-type adapter; a three-phase contact box is respectively connected with a first adapter, a second adapter and a third adapter through a T-type adapter, and the adapters are respectively connected with three-phase busbar chamber copper bars. This connection structure not only enables the horizontal distance and the vertical distance between the busbar chamber copper bars to meet the specified air safety insulation distance, but is also suitable for miniaturized medium-voltage switch cabinets. The present invention is a primary conductive circuit copper bar vertical placement scheme of the entire equipment composed of a mixed copper bar scheme of vertical placement, horizontal connection, oblique connection and special-shaped copper bar connection, which can meet the safety insulation distance requirements and operation requirements, and is a highly novel primary conductive circuit layout scheme inside a switch cabinet.

Description

Primary conductive loop structure of miniaturized medium-voltage switch cabinet

Technical Field

The invention belongs to the technical field of electric power, and particularly relates to a primary conductive loop structure of a miniaturized medium-voltage switch cabinet.

Background

The miniature medium-voltage switch cabinet is a complete power distribution device of a 3.6-12 kV three-phase alternating current 50Hz single bus and single bus sectioning system. The main market is coastal areas, particularly in power distribution room areas with relatively tight land resources, and in order to be applied to the market, the equipment is specially developed, and has the greatest advantages of saving civil area, effectively reducing the cost control target of the whole power distribution project and having wide market prospect. The product can be applied to the power distribution fields of substations, power stations, petroleum, textiles, automobiles, ports, markets and the like. The design difficulty of the very important primary conductive loop is very high, the structural specificity and the space limitation are the difficulty, and whether the reasonable design can be related to the success or failure of the miniaturized product.

At present, the connection between the contact boxes and the copper bars of the large switch cabinet on the market is directly connected with the plane where the copper bars are located, the minimum air distance of the three-phase busbar according to the national regulations for insulation safety distance cannot be less than 125mm, the safety distance between the copper bars is easy to control for the large switch cabinet, and the safety insulation distance between the bus copper bars can be met by adjusting the distance between the contact boxes.

However, in the miniaturization process of the switch cabinet, as the distances between the three-phase busbar and the corresponding adapter plates are limited, and the planes of the three-phase busbar and the adapter plates are usually arranged on one plane, the occupied lengths of the three-phase busbar are the sum of the widths of the three-phase busbar, and the space between two sides of the busbar and the adjacent busbar, namely, the preset space width in the switch cabinet is the minimum busbar width Lx 3+125mm 4, so that the switch cabinet cannot be further miniaturized.

Therefore, a primary conductive loop with a reasonable and novel structure is required to be designed, and the requirement of the air insulation safety distance of the miniaturized switch cabinet can be met.

Disclosure of Invention

In order to solve the problems, the invention discloses a primary conductive loop structure of a miniaturized medium-voltage switch cabinet. The structure that is connected to bus-bar room copper bar and contact box improves, will be originally the bus-bar room copper bar of lug and bus-bar room copper bar through T type adaptor and lug be connected, has saved the interval of the width of lug and busbar to the cubical switchboard is further miniaturized of being convenient for.

In order to achieve the above purpose, the technical scheme of the invention is as follows:

A primary conductive loop structure of a miniaturized medium-voltage switch cabinet comprises a contact box and a switch cabinet body, wherein the contact box comprises an A-phase contact box, a B-phase contact box and a C-phase contact box, T-shaped transfer pieces are connected to the A-phase contact box, the B-phase contact box and the C-phase contact box, the A-phase contact box is connected with a first transfer piece through the T-shaped transfer pieces, the B-phase contact box is connected with a second transfer piece through the T-shaped transfer pieces, the C-phase contact box is connected with a third transfer piece through the T-shaped transfer pieces, the first transfer piece is connected with an A-phase bus chamber copper bar, the second transfer piece is connected with a B-phase bus chamber copper bar, the third transfer piece is connected with a C-phase bus chamber copper bar, the plane distances among the first transfer piece, the second transfer piece, the third transfer piece and the side wall of the switch cabinet body are not smaller than the specified air safe insulation distance, the A-phase bus chamber copper bar and the B-phase bus chamber copper bar are not smaller than the specified air safe insulation distance, the first transfer piece and the third transfer piece are not parallel to the first transfer piece and are not in the same plane.

Further improvement, the upper ends of first switching piece, second switching piece and third switching piece all are formed with the kink, the kink is connected with A looks busbar room copper bar, B looks busbar room copper bar and C looks busbar room copper bar respectively.

Further improved, the A-phase bus chamber copper bar and the B-phase bus chamber copper bar are both L-shaped.

Further improvement, the second switching piece and the third switching piece are arranged in the vertical direction, and the first switching piece is arranged in the transverse direction.

Further improved, the L-shaped bending surfaces of the A-phase bus chamber copper bar and the B-phase bus chamber copper bar and the C-phase bus chamber copper bar are both on the same plane.

Further improved, the specified air safety insulation distance is 125mm.

Further improvement, the cubical switchboard cabinet body still includes the cable chamber, the contact box is installed to cable chamber top lateral wall, the one end of contact box outside the cable chamber is connected with the circuit breaker, the one end level of contact box inside the cable chamber is connected with the one end of the horizontal copper bar of cable chamber, the other end of the horizontal copper bar of cable chamber is connected with the transformer, certain angle is connected with cable chamber earthing switch copper bar below the transformer, cable chamber earthing switch copper bar below is connected with earthing switch.

Further improvement, be provided with the cable connecting hole on the cable chamber earthing switch copper bar.

The invention has the advantages that:

the special space layout among the bus bar, the T-shaped adapter, the adapter piece and the contact box can be realized, and the insulation air distance can be met by fully utilizing the space inside the bus bar chamber of the cabinet body.

Drawings

FIG. 1 is a schematic diagram of a three-phase copper bar structure of a bus bar chamber;

FIG. 2 is a schematic view of a T-adapter;

FIG. 3 is a schematic diagram of a contact box to T-adapter connection;

FIG. 4 is a schematic diagram of a bus bar overall scheme;

FIG. 5 is a schematic diagram of a cable chamber transformer;

FIG. 6 is a sectional view of a primary circuit configuration layout;

fig. 7 is a schematic overall view of the primary circuit structure layout.

The bus room phase A copper bar 1, the bus room phase B copper bar 2, the bus room phase C copper bar 3, the T-shaped adapter 4, the phase A contact box 5, the transformer 7, the cable room grounding switch copper bar 8, the cable connecting hole 9, the grounding switch 10, the circuit breaker 11, the switch cabinet body 12, the phase B contact box 13, the phase C contact box 14, the first adapter 15, the second adapter 16, the third adapter 17 and the contact box 18.

Detailed Description

The invention is further described below with reference to the drawings and examples.

Examples

The primary conductive loop structure of the miniaturized medium-voltage switch cabinet shown in fig. 1 is characterized in that the space of the bus chamber is limited because of the small space, the copper bars of the bus chamber cannot be designed according to a general conventional scheme, but are designed according to a three-phase combined copper bar scheme of fig. 1, and the primary conductive loop structure mainly comprises a copper bar 1 of a bus chamber A phase, a copper bar 2 of a bus chamber B phase and a copper bar 3 of a bus chamber C phase, wherein the copper bars of each phase are vertically placed and horizontally placed, are mutually staggered, furthest utilize the three-dimensional space, and fulfill the aim of meeting the insulation air distance. The bottom of each phase of copper bar is provided with a T-shaped adapter 4 as shown in fig. 2, and in this embodiment, the T-shaped adapter 4 is a special-shaped connection copper bar, and the function of the T-shaped adapter is mainly reversing connection, one end of the T-shaped connection copper bar is connected with a vertically arranged bus bar chamber copper bar, and the other end of the T-shaped connection copper bar is connected with the upper surface of a mounting surface in the contact box 18. The special-shaped connecting copper bar is an open-die molding piece, has a special process and is not processed by a bending process through a common numerical control bending machine.

The contact box 18 connected with the upper contact arm of the circuit breaker at the bottom of the bus bar chamber is connected with the phase A copper bar 1 of the bus bar chamber, the phase B copper bar 2 of the bus bar chamber and the phase C copper bar 3 of the bus bar chamber through special-shaped connection copper bars to form a bus bar chamber mixed copper bar scheme together, and the third switching piece 17 is arranged to be transverse so that the distance of a base point is low and the space can be fully utilized. As shown in fig. 4, a bus-bar chamber mixed copper bar scheme with an insulation air distance is formed by a special space layout combination and special-shaped copper bar connectors of bus-bar chamber copper bars, special-shaped connection copper bars and contact boxes 18, and is also a bus-bar chamber primary conductive loop copper bar standing scheme.

The space of the cable chamber is very small, the copper bars can only be directly connected and lapped, otherwise, insufficient insulating air distance can occur, and fault arc is caused. The copper bar connection scheme of the transformer part is shown in fig. 5, and mainly comprises a 6-cable-chamber horizontal copper bar 6, a transformer 7 and a cable-chamber grounding switch copper bar 8, wherein the cable-chamber horizontal copper bar 6 is horizontally erected, so that the copper bar is convenient to process and install, the cable-chamber grounding switch copper bar 8 is obliquely erected, the other end of the cable-chamber grounding switch copper bar is arranged on a grounding switch 10 shown in the following figure, the main purpose of the cable-chamber grounding switch copper bar is that the insulation distance is met, and a cable connection hole 9 is formed in the cable-chamber grounding switch copper bar 8, so that customers can conveniently lap a primary cable on the load side. The cable chamber primary conductive loop copper bar standing scheme is formed by the cable chamber horizontal copper bar 6 and the cable chamber grounding switch copper bar 8 through a novel space layout structure.

In the primary conductive loop of the miniaturized switch equipment, as shown in fig. 6 and 7, the primary conductive loop copper bar standing scheme of the whole equipment is mainly formed by the copper bar standing, horizontal connection, inclined-pull connection and special-shaped connection mixed copper bar scheme, so that the requirements of safe insulation distance and operation can be met, and the primary conductive loop layout scheme in the switch cabinet is a novel primary conductive loop layout scheme

Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown, which are well suited to various fields of use, and further modifications may be readily made by those skilled in the art without departing from the general concepts defined in the claims and the equivalents thereof, and therefore the invention is not limited to the specific details and illustrations herein.

Claims

1. A primary conductive circuit structure of a miniaturized medium-voltage switch cabinet, comprising a contact box (18) and a switch cabinet body (12), characterized in that the contact box (18) comprises an A-phase contact box (5), a B-phase contact box (13) and a C-phase contact box (14); the A-phase contact box (5), the B-phase contact box (13) and the C-phase contact box (14) are all connected to a T-type adapter (4); the A-phase contact box (5) is connected to the A-phase contact box (5) through the T-type adapter (4); The first adapter plate (15) is connected to the B-phase contact box (13) via a T-type adapter (4); the C-phase contact box (14) is connected to a third adapter plate (17) via a T-type adapter (4); the first adapter plate (15) is connected to the A-phase busbar room copper bar (1); the second adapter plate (16) is connected to the B-phase busbar room copper bar (2); the third adapter plate (17) is connected to the C-phase busbar room copper bar (3); the plane distances between the first adapter plate (15), the second adapter plate (16), the third adapter plate (17) and the side wall of the switch cabinet body (12) are not less than 125 mm; the vertical space distances between the A-phase busbar room copper bar (1) and the B-phase busbar room copper bar (2) and the C-phase busbar room copper bar (3) are not less than 125 mm; the first adapter plate (15), the second adapter plate (16) and the third adapter plate (17) are all located in different planes, and the planes in which they are located are parallel to each other; the upper ends of the first adapter plate (15), the second adapter plate (16) and the third adapter plate (17) are all formed with bent portions, and the bent portions are respectively connected to the A-phase busbar room copper bar (1), the B-phase busbar room copper bar (2) and the C-phase busbar room copper bar (3); the second adapter plate (16) and the first adapter plate (15) are arranged in the vertical direction, and the third adapter plate (17) is arranged in the horizontal direction.

2. A primary conductive circuit structure of a miniaturized medium voltage switch cabinet according to claim 1, characterized in that the A-phase busbar compartment copper bar (1) and the B-phase busbar compartment copper bar (2) are both L-shaped.

3. A primary conductive circuit structure of a miniaturized medium-voltage switchgear as claimed in claim 1, characterized in that the switchgear cabinet (12) further comprises a cable room, a contact box (18) is installed on the top side wall of the cable room, one end of the contact box (18) outside the cable room is connected to a circuit breaker (11), one end of the contact box (18) inside the cable room is horizontally connected to one end of a horizontal copper busbar (6) in the cable room, the other end of the horizontal copper busbar (6) in the cable room is connected to a mutual inductor (7), a cable room grounding switch copper busbar (8) is connected at a certain angle below the mutual inductor (7), and a grounding switch (10) is connected below the cable room grounding switch copper busbar (8).

4. A primary conductive circuit structure of a miniaturized medium voltage switch cabinet as claimed in claim 3, characterized in that a cable connection hole (9) is provided on the copper busbar (8) of the cable room grounding switch.