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

Abstract

A fully insulated busbar type 40.5kV miniaturized switchgear is composed of an instrument room, a circuit breaker handcart room, a main busbar room, and a cable room separated by the shell and the inside of the shell; The head box leads out the upper branch busbar and the lower branch busbar; the upper branch busbar is located in the main busbar room, including A, B, C three-phase branch busbars, which are respectively connected with A, B, C three-phase main busbars through tee connectors; The lower branch busbar is located in the cable room, passes through the inner cavity of the core-type current transformer, reaches the grounding knife static contact and the shielding cover of the cable lap joint, and is connected with the grounding switch static contact, the arrester lead lap point and the cable head lap point Connection installation. The switchgear can fully meet the technical requirements of the eighteen countermeasures of the State Grid, improve the overall performance of the product, especially the insulation reliability under the working conditions such as condensation and pollution. The cable room has a large redundant space, which can meet the installation and multi-cable connection requirements of multi-winding current transformers.

Description

A fully insulated busbar type 40.5kV miniaturized switch cabinet

technical field

The utility model belongs to the technical field of electric power equipment, relates to switch equipment for substations, in particular to a fully insulated bus-type 40.5kV miniaturized switch cabinet.

Background technique

The rated voltage of 40.5kV switchgear for substations is responsible for power distribution and system protection, control, measurement and other functions. Higher, the State Grid's new "eighteen" countermeasures and other specifications have also put forward corresponding requirements for insulation reliability, and the problem of insulation reliability needs to be improved urgently.

The insulation system of metal-enclosed open-tube equipment and control equipment (referred to as switchgear) includes live phase-to-phase, phase-to-ground insulation distance, and surface creepage distance of insulating parts, etc. The current miniaturized 40.5kV air-insulated switchgear busbar overlaps with adjacent phases. The ground, the air distance between bare conductors and the composite insulation distance, and the phase-to-phase insulation at the static contact of the ground knife cannot fully meet the requirements of the national grid specification, and the specification also clarifies that measures such as phase-to-phase insulation partitions should not be taken, so this must be done. The insulation system of the switchgear is fully innovated.

SUMMARY OF THE INVENTION

Aiming at the problems existing in the above-mentioned background technology, the utility model proposes a fully insulated bus-type 40.5kV miniaturized switchgear. The connection is optimized, and the outer insulation of the conductor is completely solid insulated, forming a new concept of air-insulated switchgear. .

A fully insulated busbar type 40.5kV miniaturized switchgear is composed of an outer shell and an instrument room separated by the inner shell, a circuit breaker handcart room, a main busbar room, and a cable room;

In the switch cabinet, the circuit breaker handcart leads out the upper branch busbar and the lower branch busbar respectively from the upper and lower two groups of contact boxes;

The upper branch busbar is located in the main busbar room, including A, B, and C three-phase branch busbars, which are respectively connected to the A, B, and C three-phase main busbars through tee connectors;

The lower branch busbar is located in the cable room, passes through the inner hole of the core-type current transformer, reaches the grounding knife static contact and the shielding cover of the cable lap joint, and overlaps with the grounding switch static contact, the arrester lead lap joint and the cable head. Contact connection installation.

Further, the three-phase main busbars and branch busbars of A, B, and C all use circular tubular conductors, and the insulator outside the circular tubular conductors is formed of epoxy resin material.

Further, the vertical connection of the circular tubular conductors between the A, B, C three-phase main busbars and the upper branch busbars is switched by a tee connector with full external silicone rubber solid insulation, and the horizontal and longitudinal direction of the tee is connected with the busbar conductors. In addition to the electrical connection, a tapered insulating interface is provided with each other at the same time.

Further, the upper branch bus bar in the main bus bar room and the lower branch bus bar in the cable room and the lead wire of the contact box are all cylindrical conductors, and the insulator outside the cylindrical conductor is formed by epoxy resin material.

Further, the connection between the tubular conductors of the upper and lower branch bus bars and the outgoing rectangular conductors of the contact box is connected by the stress cone structure of the tubular inner hole.

Further, the main busbar is supported by light-weight small clamps when it passes through the side plate separation.

Further, the circuit breaker adopts a solid insulated pole type vacuum circuit breaker.

The beneficial effects achieved by the invention are as follows: a 40.5kV switchgear designed with a fully insulated busbar system, under the premise of miniaturization, can fully meet the series requirements proposed by the State Grid for improving insulation reliability, and improve the overall performance of the product, especially Insulation reliability under working conditions such as condensation and contamination. After adopting this design, the redundant space of the cable room is large, which can meet the requirements for the installation of multi-winding current transformers and the overlapping of multi-cables.

Description of drawings

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

In the figure, A-instrument room, B-breaker handcart room, C-main busbar room, D-cable room, 1-breaker handcart, 2-C-phase upper branch busbar, 3-C-phase main busbar and three Through connector, 4-B phase upper branch busbar, 5-B phase main busbar and tee connector, 6-A phase upper branch busbar, 7-A phase main busbar and tee connector, 8-contact box, 9- Core type current transformer, 10- Ground knife static contact and cable lap joint shield, 11- Lower branch busbar, 12- Earthing switch static contact, 13- Surge arrester lead lap point, 14- Cable head lap contact.

Detailed ways

The technical solutions of the present utility model are further described in detail below with reference to the accompanying drawings.

A fully insulated busbar type 40.5kV miniaturized switchgear is composed of a shell 15 and an instrument room A, a circuit breaker handcart room B, a main busbar room C, and a cable room D which are separated inside the shell.

In the switch cabinet, the circuit breaker adopts a solid insulated pole type vacuum circuit breaker, and the circuit breaker trolley 1 leads out the upper branch busbar and the lower branch busbar 11 from two contact boxes 8 .

The upper branch busbar is located in the main busbar room C, including the A, B, C three-phase branch busbars 2, 4, and 6, respectively corresponding to the A, B, and C three-phase main busbars through the three-way connectors 3, 5, and 7. .

The lower branch busbar 11 is located in the cable room D, passes through the core-type current transformer 9 set by the pipe busbar, and then in the shielding cover 10 of the ground knife static contact and the cable lap joint, and is connected with the grounding switch static contact 12, The arrester lead wire bonding point 13 and the cable head bonding point 14 are connected and installed.

A, B, C three-phase main busbars and branch busbars are all made of cylindrical conductors, and the insulators outside the cylindrical conductors are made of epoxy resin.

A, B, C three-phase main busbars and upper branch busbars are connected vertically with round tubular conductors using solid-insulated tee connectors of all external silicone rubber. In addition, a tapered insulating interface is arranged with each other at the same time. After the assembly is completed, the insulating ability of the interface is equivalent to that of a solid insulating material. .

The upper branch bus bar in the main bus bar room C and the lower branch bus bar 11 in the cable room D and the lead wire of the contact box 8 are all round tubular conductors, and the insulator outside the round tubular conductor is formed of epoxy resin material.

The connection between the tubular conductors of the upper and lower branch busbars and the outgoing rectangular conductors of the contact box 8 is connected by the stress cone structure of the tubular inner hole.

The grounding switch static contact 12, the arrester lead lap 13 and the cable head lap 14 are provided with an insulating component cover 10 with a voltage equalizing shield, which improves the electric field structure around the special-shaped electrode and improves the phase-to-phase and phase-to-earth insulation. ability.

The main busbar separation between switch cabinets can save the large-sized wall bushings and use light-weight small clamps for support.

Preferably, the thicknesses of the outer insulating layers of all conductors are designed to independently meet the insulation level of the rated voltage of 40.5kV.

The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments. All should be included in the protection scope described in the claims.

Claims (7)

1. A fully insulated busbar type 40.5kV miniaturized switchgear is composed of an instrument room, a circuit breaker handcart room, a main busbar room, and a cable room separated by a casing and the inside of the casing, and is characterized in that: In the switch cabinet, the circuit breaker handcart leads out the upper branch busbar and the lower branch busbar respectively from the upper and lower two groups of contact boxes; The upper branch busbar is located in the main busbar room, including A, B, and C three-phase branch busbars, which are respectively connected to the A, B, and C three-phase main busbars through tee connectors; The lower branch busbar is located in the cable room, passes through the inner hole of the core-type current transformer, reaches the grounding knife static contact and the shielding cover of the cable lap joint, and overlaps with the grounding switch static contact, the arrester lead lap joint and the cable head. Contact connection installation. 2. A kind of fully insulated busbar type 40.5kV miniaturized switchgear according to claim 1, characterized in that: A, B, C three-phase main busbars and upper and lower branch busbars all use round tube conductors, and the round tube The insulator outside the conductor is molded with epoxy resin. 3. A fully insulated busbar type 40.5kV miniaturized switchgear according to claim 1, characterized in that: the vertical connection of the round tubular conductors between the A, B, C three-phase main busbars and the upper branch busbars adopts the The external silicone rubber solid insulated tee connector is transferred, in addition to the electrical connection between the horizontal and vertical direction of the tee and the bus conductor, a tapered insulating interface is arranged with each other at the same time. 4. A fully insulated bus-type 40.5kV miniaturized switchgear according to claim 1, characterized in that: the upper branch bus in the main bus room and the lower branch bus in the cable room and the contact box lead-out line are all made of round pipes The outer insulator of the cylindrical conductor is made of epoxy resin material. 5. A fully insulated busbar type 40.5kV miniaturized switchgear according to claim 1, characterized in that: the connection between the tubular conductors of the upper and lower branch busbars and the outgoing rectangular conductors of the contact box adopts the tubular type The stress cone structure connection of the inner hole. 6 . The fully insulated busbar type 40.5kV miniaturized switchgear according to claim 1 , wherein the main busbars between the switchgears are supported by light-weight small clamps when they pass through the side plates to separate. 7 . 7 . The fully insulated busbar type 40.5kV miniaturized switch cabinet according to claim 1 , wherein the circuit breaker adopts a solid insulated pole type vacuum circuit breaker. 8 .

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