WO2013159278A1

WO2013159278A1 - Fixation and encapsulation type vacuum switch cabinet with solid insulating assembly

Info

Publication number: WO2013159278A1
Application number: PCT/CN2012/074571
Authority: WO
Inventors: 钱璿; 李武生; 邱长江; 赵海华
Original assignee: 北京维益埃电气有限公司
Priority date: 2012-04-24
Filing date: 2012-04-24
Publication date: 2013-10-31

Abstract

The present invention relates to a fixation and encapsulation type assembled vacuum switch cabinet with solid insulation, which comprises: a bus, at least two groups of load switching units. One of said load switching units comprises a first vacuum arc extinguishing chamber as load switch, a second vacuum arc extinguishing chamber as grounding switch, and a high voltage conductor for incoming and outgoing line. The high voltage conductor, the first vacuum arc extinguishing chamber and the second vacuum arcing chamber are mutually insulated and isolated by epoxy resin. Isolation switching units are installed corresponding to the load switching units, which comprises an isolation switch and a breaker extinguishing chamber which are insulated and isolated by epoxy resin. The present invention provides the fixation and encapsulation type load switching units and isolation switching units with epoxy resin as insulation material. On the one hand it guarantees respective unit's good insulation protection capability which isn't influenced by air humidity, dust and insects, and improves the apparatus's reliability; on the other hand it's beneficial for reducing the volume of the vacuum switch cabinet.

Description

Solid-sealed solid insulation combined vacuum switchgear

Technical field

The invention relates to a solid-sealed solid insulation combined vacuum switchgear.

Background technique

In medium voltage transmission and distribution switchgear, international standards, domestic standards and power industry standards require that the circuit breaker cabinet be provided with a visible isolation fracture, and that the vacuum interrupter in the vacuum circuit breaker is opened and closed. There is no visible fracture, so the vacuum circuit breaker cabinet must be equipped with an isolating switch. In the current transmission and distribution vacuum circuit breaker cabinet, the isolating switch and the arc extinguishing chamber are insulated by air or SF6, and the two insulation methods are The production process is limited by space and the volume is not small. Book content

In view of the above technical problems, the present invention designs and develops a solid-sealed solid insulation combined vacuum switchgear. In the present invention, the epoxy resin is used as an insulating material to form a solid-sealed load switch unit and an isolating switch unit, which ensures that each unit has good insulation protection and is not affected by air humidity, dust and insects. It improves the reliability of the equipment and on the other hand helps to reduce the volume of the vacuum switchgear.

The technical solution of the present invention is:

A solid-sealed solid insulation combined vacuum switchgear, comprising:

Busbar

At least two sets of load switch units, the one load switch unit including a first vacuum interrupter serving as a load switch, a second vacuum interrupter serving as a ground switch, and a high voltage incoming and outgoing line conductor, wherein a high voltage inlet and outlet conductor is selectively electrically connected to the bus bar through the first vacuum interrupter, selectively grounded through the second vacuum interrupter, and the high voltage inlet and outlet conductor, the first vacuum arc extinguishing Insulation is separated between the chamber and the second vacuum interrupter by epoxy resin, and the load switch unit is insulated from the outside by epoxy resin;

An isolating switch unit corresponding to the load switch unit, comprising an isolating switch and a circuit breaker arc extinguishing chamber, wherein one end of the circuit breaker arc extinguishing chamber is selectively electrically connected to the bus bar through the isolating switch, The other end of the circuit breaker arc extinguishing chamber is electrically connected to the first vacuum interrupter serving as a load switch, wherein The isolation switch is insulated from the arc extinguishing chamber of the circuit breaker by an epoxy resin, and the isolation switch unit is insulated from the outside by an epoxy resin.

Preferably, in the solid-sealed solid-insulated combined vacuum switchgear cabinet, the high-voltage incoming and outgoing line conductor is selectively electrically connected to the bus bar through the first vacuum interrupter, and passes through the second vacuum interrupter Selectively grounding is achieved by:

The first vacuum interrupter has a first stationary contact and a first contact bar that can be in contact with or disengaged from the first stationary contact relative to the first stationary contact, the first static The contact is electrically connected to the bus bar, and the first contact bar is electrically connected to one end of the circuit breaker arc extinguishing chamber, and when the first contact bar is in contact with the first static contact, the circuit breaker is arc extinguished The room is electrically connected to the busbar.

The second vacuum interrupter has a second stationary contact and a second contact bar that can contact or disengage the second stationary contact relative to the second stationary contact, the second static The second contact bar is electrically connected to one end of the circuit breaker arc extinguishing chamber, and the circuit breaker arc extinguishing chamber is electrically connected when the second contact bar is in contact with the second static contact Ground.

Preferably, in the solid-sealed solid-insulated combined vacuum switchgear cabinet, the circuit breaker arc extinguishing chamber is selectively connected to the bus bar through the isolating switch, which is realized by the following manner.

The isolating switch includes a third stationary contact and a third contact bar that can be in contact with or disengaged from the third stationary contact with respect to the third stationary contact, and the third contact bar is One end opposite to the end in contact with the third stationary contact is grounded, the third stationary contact is electrically connected to the bus bar, and the third contact bar is electrically connected to one end of the circuit breaker interrupting chamber, when When the third contact bar is in contact with the third stationary contact, the circuit breaker arc extinguishing chamber is electrically connected to the bus bar, and when the third contact bar is disengaged from the third stationary contact, the circuit breaker The arc chamber is grounded.

Preferably, the solid-sealed solid insulation combined vacuum switchgear further comprises:

a combination electric unit corresponding to the load switch unit, comprising a third vacuum interrupter serving as a load switch, a fourth vacuum interrupter serving as a ground switch, and a fuse, wherein the fuse Selectively electrically connected to the bus bar through the third vacuum interrupter, selectively electrically grounded through the fourth vacuum interrupter, the third vacuum interrupter, the fourth vacuum interrupter, and The fuses are insulated by epoxy resin, and the combined electrical unit is insulated from the outside by epoxy resin.

Preferably, in the solid-sealed solid insulation combined vacuum switchgear, the third vacuum interrupter a fourth contact bar having a fourth stationary contact and a contact or disengagement action with the fourth stationary contact relative to the fourth stationary contact, the fourth stationary contact being electrically connected to the bus bar, The fourth contact rod is electrically connected to one end of the circuit breaker arc extinguishing chamber, and when the fourth contact rod is in contact with the fourth static contact, the circuit breaker arc extinguishing chamber is electrically connected to the bus bar.

The fourth vacuum interrupter has a fifth stationary contact and a fifth contact bar that can be in contact with or disengaged from the fifth stationary contact with respect to the fifth stationary contact, the fifth static The fifth contact bar is electrically connected to one end of the circuit breaker arc extinguishing chamber, and the circuit breaker arc extinguishing chamber is electrically connected when the fifth contact bar is in contact with the fifth static contact Ground.

Preferably, the solid-sealed solid-insulated combined vacuum switchgear further includes a switch operating mechanism, wherein the switch operating mechanism is respectively connected to the first contact bar by a plurality of relatively independently operated insulating pull rods, Two stalks, the third stalk, the fourth stalk, and the fifth stalk.

a switch chamber, the load switch unit, the isolating switch unit and the combined electrical unit are disposed in the switch chamber;

a busbar chamber, the busbar is disposed in the busbar room;

An operating mechanism chamber, the switch operating mechanism being disposed in the operating mechanism chamber;

a cable compartment in which a cable is disposed, wherein the cable is electrically connected to the high-voltage inlet and outlet conductors; a low-voltage control room is provided with a main control switch, and the main control switch is located at the cable and the high voltage In the connection path of the incoming and outgoing conductors;

Wherein, the switch chamber, the busbar chamber, the operating mechanism chamber, the cable chamber and the low pressure control chamber are all located in a cabinet and are separated from each other by an isolating sealing plate.

Preferably, in the solid-sealed solid insulation combined vacuum switchgear cabinet,

An exhaust passage is opened in a rear portion of the cabinet, and the switch chamber and the busbar chamber are in gas communication with the exhaust passage.

The cabinet is provided with an observation window at a position of the switch room,

The cabinet is provided with a cable fault test room door at a position of the cable room.

The cabinet is also provided with a cabinet door at a position of the cable compartment.

Preferably, in the solid-sealed solid-insulated combined vacuum switchgear, the load switch unit, the isolating switch unit and the combined electrical unit each have a columnar housing made of epoxy resin. And the outer surface of the casing is uniformly coated with a semiconductor lacquer layer.

Preferably, in the solid-sealed solid-insulated combined vacuum switchgear cabinet, the bus bar includes a conductive core wire located in the inner layer and a ring shape coaxial with the conductive core wire outside the conductive core wire An insulating layer, wherein an outer surface of the annular insulating layer is uniformly coated with a semiconductor lacquer layer.

The solid-sealed solid-insulation combined vacuum switchgear according to the present invention uses epoxy resin as an insulating material to form a solid-sealed load switch unit and an isolating switch unit, and on the one hand, each unit has good insulation protection capability, and is not The humidity, dust and insects of the air increase the reliability of the equipment and, on the other hand, help to reduce the volume of the vacuum switchgear.

DRAWINGS

1 is a schematic structural view of a solid-sealed solid insulation combined vacuum switchgear according to the present invention.

2 is a schematic view showing the structure of a load switch unit of a solid-sealed solid insulation combined vacuum switchgear according to the present invention.

3 is a schematic view showing the structure of a combined electric unit of a solid-sealed solid-insulated combined vacuum switchgear according to the present invention.

4 is a schematic view showing the structure of an isolating switch unit of a solid-sealed solid-insulated combined vacuum switchgear according to the present invention.

detailed description

As shown in FIG. 1 , the present invention provides a solid-sealed solid insulation combined vacuum switchgear, comprising: a bus bar; at least two sets of load switch units, the one load switch unit including a first vacuum arc extinguisher used as a load switch a second vacuum interrupter serving as a grounding switch and a high voltage incoming and outgoing line conductor, wherein the high voltage incoming and outgoing line conductor is selectively electrically connected to the busbar through the first vacuum interrupter, through the The second vacuum interrupter is selectively grounded, and the high voltage inlet and outlet conductors, the first vacuum interrupter and the second vacuum interrupter are insulated by epoxy resin, and the load switch The unit is insulated from the outside by the epoxy resin; the isolating switch unit is disposed corresponding to the load switch unit, and includes an isolating switch and a circuit breaker arc extinguishing chamber 13, and the one end 12 of the circuit breaker arc extinguishing chamber passes The isolating switch 16 is selectively electrically connected to the bus bar, and the other end 14 of the circuit breaker arcing chamber is electrically connected to the first vacuum interrupter serving as a load switch, wherein Isolation between the said switch and the circuit breaker chamber by means of an epoxy resin insulating spacer achieved, while the isolation switch cell isolation from the outside of the insulation is achieved by an epoxy resin. In the solid-sealed solid-insulated combined vacuum switchgear, the high-voltage inlet and outlet conductors are selectively electrically connected to the busbar through the first vacuum interrupter, and are selectively grounded through the second vacuum interrupter Is achieved by the first vacuum interrupter having a first stationary contact and a first contact or disengagement action with the first stationary contact relative to the first stationary contact a first static contact electrically connected to the bus bar, the first contact bar being electrically connected to one end of the circuit breaker interrupter, when the first contact bar is in contact with the first stationary contact The circuit breaker arcing chamber is electrically connected to the bus bar, the second vacuum interrupter has a second static contact and the contact with the second stationary contact may occur with respect to the second stationary contact or a second contact bar that is disengaged, the second static contact is electrically grounded, and the second contact bar is electrically connected to one end of the circuit breaker arc extinguishing chamber, when the second contact bar is opposite to the second When the static contact is in contact, the circuit breaker arc extinguishing chamber is electrically grounded.

In the solid-sealed solid-insulated combination vacuum switchgear, the circuit breaker arc-extinguishing chamber is selectively connected to the bus bar through the isolating switch 16, which is realized by the following manner, the isolating switch includes a third static touch a point 15 and a third contact bar 11 that can be in contact with or disengaged from the third stationary contact with respect to the third stationary contact, and the third contact 11 can be connected to the third static One end of the contact contact is grounded at one end, the third static contact is electrically connected to the bus bar, and the third contact rod is electrically connected to one end of the circuit breaker interrupting chamber, when the third contact rod When the third static contact is in contact, the circuit breaker arc extinguishing chamber is electrically connected to the bus bar, and when the third contact bar is disengaged from the third static contact, the circuit breaker arc extinguishing chamber is grounded.

The solid-sealed solid-insulated combined vacuum switchgear further includes: a combined electric unit 9 corresponding to the load switch unit, including a third vacuum interrupter 96 serving as a load switch, and a grounding a fourth vacuum interrupter 97 of the switch and a fuse 91, wherein the fuse is selectively electrically connected to the bus bar through the third vacuum interrupter, and selectively electrified by the fourth vacuum interrupter Grounding, the third vacuum interrupter, the fourth vacuum interrupter, and the fuse are insulated by epoxy resin, and the combined electrical unit is insulated from the outside by epoxy resin. .

In the solid-sealed solid-insulated combined vacuum switchgear cabinet, the third vacuum interrupter 96 has a fourth stationary contact 94 and can be generated with respect to the fourth stationary contact and the fourth stationary contact a fourth contact bar 92 that contacts or disengages, the fourth stationary contact is electrically connected to the bus bar, and the fourth contact bar is electrically connected to one end of the circuit breaker arc extinguishing chamber, when the fourth contact bar When the fourth static contact is in contact, the circuit breaker arc chamber is electrically connected to the bus bar, and the fourth vacuum interrupter 97 has a fifth stationary contact 95 and can be generated relative to the fifth stationary contact a fifth contact lever 93 that is in contact with or disengages from the fifth stationary contact, the fifth static touch Electrically grounded, the fifth contact rod is electrically connected to one end of the circuit breaker arc extinguishing chamber, and when the fifth contact rod is in contact with the fifth static contact, the circuit breaker arc extinguishing chamber is electrically grounded .

The solid-sealed solid-insulated combined vacuum switchgear further includes: a switch operating mechanism, wherein the switch operating mechanism is respectively connected to the first contact bar and the second touch bar by a plurality of relatively independently operated insulating pull rods The third touch rod, the fourth touch rod and the fifth touch rod.

The solid-sealed solid-insulated combined vacuum switchgear further includes: a switch chamber, the load switch unit, the isolating switch unit and the combined electrical unit are disposed in the switch room; a busbar room, the busbar Provided in the busbar chamber; the operating mechanism chamber, the switch operating mechanism is disposed in the operating mechanism chamber; the cable room is provided with a cable therein, wherein the cable is electrically connected to the high-voltage inlet and outlet line conductor; a main control switch is disposed in the room, and the main control switch is located on a connecting path of the cable and the high-voltage incoming and outgoing line conductor; wherein the switch room, the bus bar room, the operating mechanism room, and the The cable compartment and the low pressure control compartment are both located in a cabinet and are separated from one another by a spacer seal.

In the solid-sealed solid-insulated combination vacuum switchgear, the rear portion of the cabinet is provided with an exhaust passage, and the switch chamber and the busbar chamber are in gas communication with the exhaust passage, and the cabinet is in The position of the switch room is provided with an observation window, and the cabinet body is provided with a cable fault test room door at a position of the cable room, and the cabinet body is further provided with a cabinet door at a position of the cable room.

In the solid-sealed solid-insulated combined vacuum switchgear cabinet, the load switch unit, the isolating switch unit and the combined electrical unit each have a columnar housing made of epoxy resin, and The outer surface is uniformly coated with a layer of semiconductor lacquer.

In the solid-sealed solid-insulated combined vacuum switchgear cabinet, the bus bar includes a conductive core wire located in the inner layer and an annular insulating layer on the outer side of the conductive core wire coaxial with the conductive core wire, wherein The outer surface of the annular insulating layer is uniformly coated with a semiconductor lacquer layer.

As shown in Fig. 1, the solid-sealed solid-insulated vacuum switchgear of the present invention is composed of a low-voltage control room 1, an operating mechanism room 2, a switch room 3, a cable room 4, and a bus bar room 5.

The switch chamber has at least two load switch units 8, a combined electrical unit 9 and an isolating switch unit

10.

The load switch unit 8 is formed by placing the connected first vacuum interrupter, the second vacuum interrupter, and the high-voltage inlet and outlet conductors in a mold, and injecting epoxy resin into the mold. A pole-shaped epoxy tree is formed around a vacuum interrupter, a second vacuum interrupter, and a high-voltage inlet and outlet conductor A grease housing that seals the three.

The first vacuum interrupter and the second vacuum interrupter in the load switch unit are arranged parallel to each other, and the high-voltage inlet and outlet conductors are connected to the movable contacts of the two vacuum interrupters, and the other end is the high-voltage cable access end. The upper portion of the load switching unit is a recess, and a corrugation for increasing the insulation distance is provided along the inner wall of the recess. The connection structure of the high-voltage inlet and outlet conductors and the movable contacts of the two vacuum interrupters is realized by a brush holder, a conductive sleeve, a coil spring and a guide sleeve. The two brush holders are welded to the high-voltage inlet and outlet conductors, and the conductive sleeves are respectively sleeved on the first contact rod of the first vacuum interrupter and the second contact rod of the second vacuum interrupter, and the coil spring is placed on the conductive sleeve and the brush Between the seats, the coil spring is in close contact with the conductive sleeve and the brush holder, and the guiding sleeve is sleeved on the conductive sleeve and fixedly mounted on the upper end of the brush holder. The material of the guide sleeve is polytetrafluoroethylene.

When the first contact rod of the first vacuum interrupter or the second contact rod of the second vacuum interrupter is pulled (ie, corresponding to the splitting and closing action of the switch), the conductive sleeve slides back and forth in the guide sleeve, and the coil spring ensures The close contact of the conductive sleeve and the brush holder ensures good electrical contact between the high voltage inlet and outlet conductors and the first and second contacts. Here, the movable contacts of the two vacuum interrupters refer to the first contact rod of the first vacuum interrupter and the second contact rod of the second vacuum interrupter.

The third stationary contact of the isolating switch unit is located at the lower end, and the movable contact is a third contact bar that moves up and down. When moving downward, contact with the third static contact to open the circuit breaker arc extinguishing chamber and the busbar side; when moving upward, contact the upper end of the circuit breaker arc extinguishing chamber and ground, and the upper and lower ends of the circuit breaker arc extinguishing chamber are turned on. After that, the outlet side is grounded to ensure the safety of the operator.

Load switch unit 8, combined electrical unit 9, the outer surface of the isolating switch unit 10 is sprayed with semiconductor paint, connected to the cabinet to access the earth, to ensure the safety of the operator. The three are located in the switch room, and an observation window can be set on the cabinet of the switch cabinet, and the opening and closing state can be observed through the observation window.

The busbar and the connector are touch-shielded, the inner layer is a conductor (conductive core), the conductor is wrapped by a rubber insulator, and the outer surface of the rubber insulator (insulation layer) is coated with a layer of semiconductor lacquer. The semiconductor lacquer is grounded directly through the grounding wire to ensure Operator safety. The busbar contacts are divided into straight busbar joints and bent busbar joints, which are easy to expand, easy to replace and safer, and realize compact installation of busbars.

Busbar room 5, cable room 4, operating mechanism room 2. There is an isolation sealing plate between the low-voltage control room 1 to prevent each other from affecting each other after a fault occurs.

The rear part of the cabinet is designed with an exhaust passage. When the switch room and the busbar room fail, the air can be exhausted from the cabinet section without damaging the front or rear operator. The cable compartment 4 is provided with two doors, one is a cabinet door, and the other is a cable fault test chamber door, which is interlocked with the operating mechanism chamber 2. In the event of a cable failure, it is not necessary to open the cabinet door, but the cable is operated in the order of operation. The fault test door is opened, and the fault point can be measured with a special tool, so that the fault point can be judged without removing the cable, and the efficiency of handling the accident on the spot is improved.

The above embodiments are merely illustrative of the present invention, and the structure and connection of the components may be varied. On the basis of the technical solution of the present invention, the connection and structure of individual components are improved according to the principles of the present invention. And equivalent transformations should not be excluded from the scope of protection of the present invention.

Claims

Claim

A solid-sealed solid insulation combined vacuum switchgear, characterized in that it comprises:

Busbar

An isolating switch unit corresponding to the load switch unit, comprising an isolating switch and a circuit breaker arc extinguishing chamber, wherein one end of the circuit breaker arc extinguishing chamber is selectively electrically connected to the bus bar through the isolating switch, The other end of the circuit breaker arc extinguishing chamber is electrically connected to the first vacuum interrupter serving as a load switch, wherein the isolating switch and the circuit breaker arc extinguishing chamber are insulated by epoxy resin, and at the same time The isolating switch unit is insulated from the outside by an epoxy resin.

2. The solid-sealed solid-insulated combined vacuum switchgear according to claim 1, wherein said high-voltage inlet and outlet conductors are selectively electrically connected to the busbar through said first vacuum interrupter, said said The selective connection of the two vacuum interrupters is achieved by the following means.

The solid-sealed solid-insulated combined vacuum switchgear according to claim 1, wherein the circuit breaker arc extinguishing chamber is selectively connected to the bus bar through the isolating switch, and is realized by the following manner. The isolating switch includes a third stationary contact and a third contact bar that can be in contact with or disengaged from the third stationary contact relative to the third stationary contact, and the third contact bar is The third stationary contact One end of the contact end is grounded, the third stationary contact is electrically connected to the bus bar, and the third contact bar is electrically connected to one end of the circuit breaker interrupter, when the third contact bar and the third When the three static contacts are in contact, the circuit breaker arc extinguishing chamber is electrically connected to the bus bar, and when the third contact bar is disengaged from the third static contact, the circuit breaker arc extinguishing chamber is grounded.

4. The solid-sealed solid-insulated combined vacuum switchgear according to claim 1, further comprising:

The solid-sealed solid-insulated combined vacuum switchgear according to claim 4, wherein the third vacuum interrupter has a fourth stationary contact and is movable relative to the fourth stationary contact a fourth contact bar that contacts or disengages the fourth stationary contact, the fourth stationary contact is electrically connected to the bus bar, and the fourth contact bar is electrically connected to one end of the circuit breaker interrupter When the fourth contact bar is in contact with the fourth stationary contact, the circuit breaker arc extinguishing chamber is electrically connected to the bus bar.

The solid-sealed solid-insulated combined vacuum switchgear according to claim 5, further comprising: a switch operating mechanism, wherein the switch operating mechanism is respectively connected to the first through a plurality of relatively independently operated insulating pull rods a touch lever, the second touch lever, the third touch lever, the fourth touch lever, and the fifth touch lever.

7. The solid-sealed solid-insulated combined vacuum switchgear cabinet of claim 6, further comprising:

a busbar chamber, the busbar is disposed in the busbar room; An operating mechanism chamber, the switch operating mechanism is disposed in the operating mechanism chamber; a cable room is provided with a cable therein, wherein the cable is electrically connected to the high voltage incoming and outgoing wire conductor; and a low voltage control room is provided therein a main control switch, wherein the main control switch is located on a connection path between the cable and the high voltage input and output line conductor;

8. The solid-sealed solid-insulated combined vacuum switchgear according to claim 7, wherein an exhaust passage is opened in a rear portion of the cabinet, the switch chamber and the busbar chamber and the exhaust Channel gas connection,

The solid-sealed solid-insulated combined vacuum switchgear according to claim 5, wherein the load switch unit, the isolating switch unit and the combined electrical unit each have an epoxy resin The cylindrical casing is uniformly coated with a semiconductor lacquer layer on the outer surface of the casing.

10 . The solid-sealed solid-insulated combined vacuum switchgear according to claim 1 , wherein the bus bar comprises a conductive core wire located in the inner layer and the conductive core wire outside the conductive core wire A coaxial annular insulating layer, wherein an outer surface of the annular insulating layer is uniformly coated with a semiconductor lacquer layer.