CN210723712U

CN210723712U - Full-insulated bus type 40.5kV miniaturized switch cabinet

Info

Publication number: CN210723712U
Application number: CN201922236929.5U
Authority: CN
Inventors: 马炳烈
Original assignee: Wujiang Transformer Co Ltd
Current assignee: Wujiang Transformer Co Ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2020-06-09
Anticipated expiration: 2029-12-13

Abstract

A full-insulated bus type 40.5kV miniaturized switch cabinet comprises a shell, and an instrument room, a breaker handcart room, a main bus room and a cable room which are separated from the inside of the shell; in the switch cabinet, an upper branch bus and a lower branch bus are respectively led out of a circuit breaker handcart from an upper group of contact boxes and a lower group of contact boxes; the upper branch bus is positioned in the main bus chamber, comprises A, B, C three-phase branch buses, and is respectively connected with the A, B, C three-phase main bus through a three-way connector; the lower branch bus is positioned in the cable chamber, penetrates through the inner cavity of the core-through current transformer, reaches the grounding switch static contact and the cable lap joint shield, and is connected and installed with the grounding switch static contact, the lightning arrester lead lap joint and the cable joint lap joint. The switch cabinet can completely meet series technical requirements of eighteen measures of national power grids, improves the overall performance of products, and particularly integrally improves the insulation reliability under working condition environments such as condensation resistance and dirt resistance. The redundant space of the cable chamber is large, and the requirements of the installation of the multi-winding current transformer and the lap joint of a plurality of cables can be met.

Description

Full-insulated bus type 40.5kV miniaturized switch cabinet

Technical Field

The utility model belongs to the technical field of power equipment, a for the transformer substation switchgear is related to, concretely relates to miniaturized cubical switchboard of full insulated bus type 40.5 kV.

Background

The rated voltage 40.5kV switch cabinet for the transformer substation undertakes functions such as electric energy distribution and system protection, control and measurement, and the air insulation type product with the largest application amount has more remarkable insulation performance weakening and long-term operation aging phenomena under the conditions of humidity, heat and the like, has higher failure rate, and the new eighteen specifications of national power grid such as 'eighteen' countermeasures also put forward corresponding requirements on insulation reliability and the like, and the problem of the insulation reliability is to be improved urgently.

The insulation system of metal closed open-tube equipment and control equipment (switch cabinet for short) comprises electrified body interphase, phase-to-ground insulation distance, surface creep distance of an insulation part and the like, the existing miniaturized 40.5kV air insulation switch cabinet bus lap joint and adjacent phase and ground, air distance between bare conductors, composite insulation distance, interphase insulation at static contacts of grounding switch and the like cannot completely meet the requirements of national grid standards, and the standards clearly do not adopt measures such as interphase insulation partition plates and the like, so that the insulation system of the switch cabinet needs to be comprehensively innovated.

Disclosure of Invention

The utility model discloses to the problem that exists among the above-mentioned background art, provide a full insulation generating line type 40.5kV miniaturized cubical switchboard, optimize all current-carrying main circuit conductors such as main bus and the interior branch generating line of cabinet that connect between the cabinet in the cabinet and connect, adopt complete solid insulation to the conductor external insulation, formed the air insulated switchgear of a new concept. .

A full-insulated bus type 40.5kV miniaturized switch cabinet comprises a shell, and an instrument room, a breaker handcart room, a main bus room and a cable room which are separated from the inside of the shell;

in the switch cabinet, an upper branch bus and a lower branch bus are respectively led out of a circuit breaker handcart from an upper group of contact boxes and a lower group of contact boxes;

the upper branch bus is positioned in the main bus chamber, comprises A, B, C three-phase branch buses, and is respectively correspondingly connected with the A, B, C three-phase main bus through a three-way connector;

the lower branch bus is positioned in the cable chamber, penetrates through an inner hole of the core-through current transformer, reaches the grounding switch static contact and the cable lap joint shield cover, and is connected and installed with the grounding switch static contact, the lightning arrester lead lap joint and the cable joint lap joint.

Furthermore, A, B, C three-phase main bus and branch bus are all circular tube-shaped conductors, and the insulator outside the circular tube-shaped conductors is molded by epoxy resin materials.

Furthermore, the vertical connection of the circular tube-shaped conductor between the A, B, C three-phase main bus and the upper branch bus is switched by a three-way connector which is insulated by silicon rubber solid, and the transverse direction and the longitudinal direction of the three-way connector are mutually provided with conical insulating interfaces besides the electric connection with the bus conductor.

Furthermore, the upper branch bus of the main bus chamber, the lower branch bus of the cable chamber and the outgoing line of the contact box are all round tubular conductors, and insulators outside the round tubular conductors are molded by epoxy resin materials.

Furthermore, the tubular conductors of the upper branch bus and the lower branch bus are connected with the outgoing line rectangular conductor of the contact box by adopting a stress cone structure of a tubular inner hole.

Further, the main bus bars are supported by light-weight small-sized clamps when crossing the side plate partitions.

Further, the circuit breaker employs a solid insulation pole type vacuum circuit breaker.

The invention achieves the following beneficial effects: the 40.5kV switch cabinet adopting the fully-insulated bus system design can completely meet the series requirements of the national power grid on improving the insulation reliability on the premise of miniaturization, and improves the overall performance of the product, particularly the insulation reliability under the working condition environments of resisting condensation, dirt and the like. After the design is adopted, the redundant space of the cable chamber is large, and the requirements of the installation of the multi-winding current transformer and the lap joint of multiple cables can be met.

Drawings

Fig. 1 is a schematic structural diagram of a switch cabinet according to an embodiment of the present invention.

In the figure, an A-instrument room, a B-circuit breaker handcart room, a C-main bus room, a D-cable room, a 1-circuit breaker handcart, a 2-C phase upper branch bus, a 3-C phase main bus and a three-way connector, a 4-B phase upper branch bus, a 5-B phase main bus and a three-way connector, a 6-A phase upper branch bus, a 7-A phase main bus and a three-way connector, an 8-contact box, a 9-core-penetrating current transformer, a 10-grounding knife static contact and cable lap joint shielding cover, an 11-lower branch bus, a 12-grounding switch static contact, a 13-lightning arrester lead lap joint and a 14-cable joint.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings.

A full-insulated bus type 40.5kV miniaturized switch cabinet comprises a shell 15, and an instrument room A, a breaker handcart room B, a main bus room C and a cable room D which are separated from the inside of the shell.

In the switch cabinet, the circuit breaker adopts a solid insulation pole type vacuum circuit breaker, and a circuit breaker handcart 1 is led out of an upper branch bus and a lower branch bus 11 by two contact boxes 8.

The upper branch bus is positioned in the main bus chamber C, comprises A, B, C three-phase branch buses 2, 4 and 6, and is respectively correspondingly connected with the A, B, C three-phase main bus through three-

way connectors

3, 5 and 7.

The lower branch bus 11 is positioned in the cable chamber D, penetrates through the core-through current transformer 9 sleeved by the tubular bus, and is connected and mounted with the grounding switch static contact 12, the lightning arrester lead lapping point 13 and the cable head lapping point 14 in the grounding switch static contact and cable lap joint shielding cover 10.

A. B, C the three-phase main bus and branch bus are all round tubular conductors, and the insulator outside the round tubular conductors is molded by epoxy resin material.

A. B, C vertical connection of circular tube-shaped conductors between three-phase main bus and upper branch bus is switched by three-way connector with all-external silicon rubber solid insulation, and the transverse and longitudinal directions of the three-way are connected with bus conductors except for electric connection, and simultaneously are provided with conical insulation interfaces, after assembly, the insulation capacity of the interfaces is equal to that of solid insulation materials. .

The upper branch bus of the main bus chamber C, the lower branch bus 11 of the cable chamber D and the outgoing line of the contact box 8 are all round tubular conductors, and insulators outside the round tubular conductors are molded by epoxy resin materials.

The connection between the tubular conductors of the upper branch bus and the lower branch bus and the outgoing line rectangular conductors of the contact box 8 adopts a stress cone structure of a tubular inner hole for connection.

The insulating component cover 10 with voltage-sharing shielding is arranged at the grounding switch static contact 12, the lightning arrester lead wire lap joint point 13 and the cable head lap joint point 14, the electric field structure around the special-shaped electrode is improved, and the interphase and phase-to-ground insulating capability is improved.

The main bus separation between the switch cabinets can reduce and save large-size wall bushing and is supported by a light-weight small-size hoop.

Preferably, the thickness of the outer coating insulation of all conductors is designed to independently meet the insulation level of the rated voltage 40.5kV voltage class.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment, but all equivalent modifications or changes made by those skilled in the art according to the present invention should be included in the protection scope of the claims.

Claims

1. The utility model provides a miniaturized cubical switchboard of full insulation bus type 40.5kV, comprises shell and the inside instrument room, circuit breaker handcart room, main bus-bar room, the cable chamber of separating of shell, its characterized in that:

2. The fully insulated bus type 40.5kV miniaturized switch cabinet according to claim 1, characterized in that: A. b, C the three-phase main bus and the upper and lower branch buses are all made of round tubular conductors, and the insulators outside the round tubular conductors are made of epoxy resin materials.

3. The fully insulated bus type 40.5kV miniaturized switch cabinet according to claim 1, characterized in that: A. b, C the vertical connection of the round tubular conductor between the three-phase main bus and the upper branch bus is switched by a three-way connector insulated by silicon rubber solid, and the transverse and longitudinal directions of the three-way are connected with the bus conductor and are provided with conical insulated interfaces.

4. The fully insulated bus type 40.5kV miniaturized switch cabinet according to claim 1, characterized in that: the upper branch bus of the main bus chamber, the lower branch bus of the cable chamber and the outgoing line of the contact box are all round tubular conductors, and insulators outside the round tubular conductors are molded by epoxy resin materials.

5. The fully insulated bus type 40.5kV miniaturized switch cabinet according to claim 1, characterized in that: the tubular conductors of the upper branch bus and the lower branch bus are connected with the outgoing line rectangular conductor of the contact box by adopting a stress cone structure of a tubular inner hole.

6. The fully insulated bus type 40.5kV miniaturized switch cabinet according to claim 1, characterized in that: and when the main bus between the switch cabinets passes through the side plate for separation, a light-weight small-sized hoop is used for supporting.

7. The fully insulated bus type 40.5kV miniaturized switch cabinet according to claim 1, characterized in that: the circuit breaker adopts a solid insulation pole type vacuum circuit breaker.