WO2010031289A1

WO2010031289A1 - Epoxy resin casted solid insulation switch with three chambers

Info

Publication number: WO2010031289A1
Application number: PCT/CN2009/073343
Authority: WO
Inventors: 李文东; 朱书明; 李建; 魏海波; 刘天佐
Original assignee: 沈阳昊诚电力科技有限公司
Priority date: 2008-09-19
Filing date: 2009-08-19
Publication date: 2010-03-25
Also published as: CN101677177B; CN101677177A

Abstract

An epoxy resin casted solid insulation switch with three chambers comprises three switch bodies (7) with the same structure. The switch body (7) comprises an isolating chamber (21), a vacuum arc extinguishing chamber (19) and a fuse chamber (27). A bus contact (30) is disposed at the top of an isolating switch (29). A bus contact (30) is connected fixedly with an isolating contact (14) by a bus row (15). Two ends of the isolating switch (29) are installed with a grounding contact (22) and an isolating contact (14) separately. A middle contact (17) is disposed between the grounding contact (22) and the isolating contact (14). The contact bases (11) of three contacts have same structure. The front end of a leading screw (25) is connected with an insulation screw (18). The back end of the leading screw (25) is connected with an operating mechanism (24). A hole (31) is disposed at the center of the isolating moveable contact (16), which is connected fixedly with the insulation screw (18). The insulation screw (18) is sleeved on the leading screw (25) and connected with leading screw (25) rotatablely. The vacuum arc extinguishing chamber (19) and the fuse chamber (27) are disposed under the isolating chamber (21) separately.

Description

Epoxy cast three-chamber solid insulation switch

Technical field

The invention relates to a high-voltage switch for electric power, in particular to a fully insulated epoxy casting solid insulated switch with three compartments of isolation, vacuum interrupter and fuse.

Background technique

Power switch is one of the key equipments in the power supply industry. It is used for the safe operation of power station generator sets. It is used as a switch for power transmission and transformation lines. It is one of the key components in relay protection and plays a role in safe power transmission. Mines, oil fields, and enterprises are used as equipment for industrial power distribution and electrical traction. It seems that power switches play an important role in distributing electrical energy and protecting power distribution equipment.

The power switch currently used and the switchgear used with it are relatively large in size, and a large amount of SF6 gas is used, which can cause serious pollution to the environment, and the scalability of the power switch itself is poor, and the installation is inconvenient, sometimes due to The restrictions on the installation site, the actual installation or replacement of the power switch and the switchgear are difficult. The reliability of the power switch and the switchgear is also poor due to factors such as insulation performance, material material, and use environment, which greatly increases manufacturing costs and operation and maintenance costs. In order to improve the power supply reliability and power quality of the users, the current switchgear has determined the development of grid equipment to oil-free, high-security, high-reliability, miniaturization and integration, simplifying the voltage level, and building a double-loop network to make high voltage. Go deep into the load center and take a look at the planned city network structure. Therefore, there is a need for a fully insulated switch and switchgear that is fully insulated, compact, small, expandable, weatherproof, easy to install, maintenance free, environmentally friendly, and other features and features to meet the city's Rural power supply requirements.

Summary of the invention

The object of the present invention is to solve the problems that the current high-voltage switch and the switch cabinet are bulky, the SF6 gas arc-extinguishing energy can cause serious pollution to the environment, the expandability is poor, the installation is inconvenient, the reliability is poor, and the manufacturing cost and the operation and maintenance cost are high. Providing a compact structure, small size, and operation and maintenance Epoxy cast solid insulated double isolating switch that is low, unaffected by the operating environment, can significantly reduce power infrastructure investment and reduce loss of transmission and feeder lines.

The above objectives are achieved by the following technical solutions:

The epoxy cast solid insulated double isolating switch comprises a casing and three operating mechanisms of the same switch body and three finished parts corresponding to three phases of alternating currents A, B and C;

The switch body comprises a vacuum interrupter compartment and two upper and lower isolating switches of the same structure; the upper isolating switch, the vacuum interrupter compartment and the lower isolating switch are fixedly connected to each other, and the upper isolating switch is located in the vacuum interrupter compartment Above, the lower isolation switch is located under the vacuum interrupter compartment, and the horizontal installation direction is the same as the upper isolation switch, and the vertical installation direction is opposite to the upper isolation switch;

The upper and lower isolating switches include upper and lower busbar contacts, upper and lower isolated moving contacts, upper and lower grounding contacts, upper and lower isolating contacts, upper and lower intermediate contacts; and upper and lower busbar contacts The heads are respectively located at the top of the upper and lower isolating switches, and the upper and lower busbars are provided with upper and lower busbars at the bottom, and are fixedly connected with one ends of the upper and lower busbars, and the other ends of the upper and lower busbars are upper and upper, The lower isolating contact is fixedly connected; the upper and lower grounding contacts are respectively fixed with upper and lower grounding contacts and upper and lower isolating contacts, and the lower part of the upper part of the upper and lower isolating switches is fixedly mounted, The lower intermediate contact, the upper and lower isolating contacts, the upper and lower intermediate contacts, and the lower and lower grounding contacts are respectively provided with the same contact bases, and the three contact bases of the same isolating switch are located at the same horizontal line. The center of the contact base is respectively provided with a sliding guide hole; the sliding guide hole is provided with a commercially available finished part bracelet chain finger, and an upper and lower lead screw are respectively arranged in the sliding guide hole of the contact base of the upper and lower isolation switches,The front end of the lead screw is coupled with the insulating thread, and the rear end of the lead screw is coupled with the operating mechanism of the finished product;

The upper and lower isolated moving contacts are shaped like a tube, and the center of the upper and lower movable moving contacts are provided with through holes, and one ends of the upper and lower isolated moving contacts are respectively provided with upper and lower insulating wires, upper and lower isolation The movable contacts are respectively fixedly connected with the insulating nut, and the two insulating cores are respectively sleeved on the upper and lower screws and The lead screw is rotatably connected; the two ends of the upper and lower isolated moving contacts respectively correspond to the elastic contact of the bracelet contact fingers in the sliding guide holes on the contact bases of the upper and lower isolation contacts and the upper and lower intermediate contacts respectively The rotation of the upper and lower screws respectively correspond to elastic contact between the upper and lower intermediate contacts and the contact fingers of the sliding guide holes on the contact bases of the upper and lower ground contacts;

The upper and lower isolating switches, the upper and lower grounding contacts, the upper and lower busbar contacts, the upper and lower isolating contacts, and the upper and lower intermediate contacts are respectively cast by a known technique using an epoxy resin to form a fully sealed integrated structure. Double isolation switch with the same structure;

The vacuum interrupter chamber comprises a vacuum interrupter and an insulating pull rod; the rear end of the insulating rod is connected with a rotating component of the operating mechanism at the right end of the switch body, and the front end of the insulating rod is connected with the movable end of the vacuum interrupter. At the same time, the end of the soft connection is fastened, and the other end of the upper soft connection is fastened to the bottom end of the contact base of the upper intermediate contact; the movable end of the vacuum interrupter is located at the static end of the vacuum interrupter The two ends of the vacuum interrupter; the static end of the vacuum interrupter is fixedly connected to one end of the lower busbar, and the other end of the lower busbar is fixedly connected with the lower outlet contact;

The upper and lower isolating switches have three structural states: closing, opening and grounding. The grounding state is designed to make the isolating switch in a safe state. The grounding state is: the isolated moving contact is always backward with the screw rotating. Moving, the front end of the final isolated moving contact is in contact with the bracelet finger in the intermediate contact, and the rear end of the isolated moving contact is in contact with the bracelet finger in the contact base of the ground contact to complete the grounding process.

The above switch body is made of epoxy casting.

The principle and working procedure of epoxy cast solid insulated double isolation switch:

The epoxy cast solid insulated double isolating switch adopts a modular modular structure as shown in Figure 1. The upper part is the upper isolation switch of the incoming line, and the lower part is the lower isolation switch of the cable output. The configuration of the double isolation switch is convenient and safe. This switch is flexible and convenient. If you use the upper incoming line, AC power supply, B, C three-phase bus (can also be plugged into the cable), take one phase as an example: The current is transmitted to the upper isolation through the cable introduction device. The upper busbar contact of the switch passes the upper busbar contact to the upper isolation contact. If the upper isolation switch is in the closed state, the current flows from the upper isolation contact via the upper isolation movable contact to the upper intermediate contact, and the upper intermediate contact outputs The current is transmitted to the movable end of the vacuum interrupter via a soft connection, and the movable end and the static end of the vacuum interrupter can be separated or closed by the control of the operating mechanism. If the vacuum interrupter is in the closed state, the current output from the static end of the vacuum interrupter is transmitted to the lower intermediate middle through the lower lead busbar to the lower intermediate contact, and if the lower isolating switch is in the closed state, the current flows through The intermediate contact is transmitted to the lower isolation moving contact, and then is output to the lower busbar contact by the lower isolation moving contact to the lower isolation contact of the lower isolation switch, and the lower busbar contact transmits current to the cable to the external electrical connection. The device eventually forms a conductive loop.

If the down line is used, the current flow sequence is opposite to the upper line. AC power supply, B, C three-phase busbar (can also be plugged into the cable), taking one phase as an example, the power supply current is transmitted to the lower busbar contact of the lower isolation switch through the cable introduction device, and is touched by the lower busbar. Head-to-down isolation contact, if the lower isolation switch is in the closed state, the current passes through the lower isolation moving contact to the lower intermediate contact, and the current output from the lower intermediate contact to the lower lead busbar, through the lower lead busbar to the vacuum The static end of the arc chamber can be separated or closed by the control of the operating mechanism so that the movable end and the static end of the vacuum interrupter can be separated. If the vacuum interrupter is in the closed state, the current output from the movable end of the vacuum interrupter is transmitted to the intermediate contact of the upper isolating switch via the soft connection. If the upper isolating switch is in the closed state, the current is passed through the upper intermediate contact. The upper movable contact is separated, and then the upper movable contact is outputted to the upper bus contact, and the upper bus contact transmits current to the feed cable to the external electrical device to form a conductive loop.

Features of the invention:

1. The invention adopts epoxy resin casting full insulation equipment, is not affected by the surrounding environment during operation, and is not affected by condensation and pollution. 2. The invention has extremely high electrical safety performance, and there is no possibility of explosion when the switch is opened or the short-circuit current occurs.

3. The insulation of the invention is casted by a water-repellent epoxy resin, which does not have the risk of gas and liquid leakage, and does not pollute the environment.

4. The switch of the invention uses an epoxy resin to seal the cavity, and the seal is not affected by the outside air.

5. The present invention has two isolating switches that form two isolated fractures, i.e., the spacing between the upper and lower isolation contacts and the upper and lower intermediate contacts.

6, the line mode is flexible, you can go up the line, you can also enter the line.

7. The isolating switch of the invention has three states of closing, opening and grounding.

8. The grounding contact, the intermediate contact, the isolating contact and the busbar contact of the isolating switch of the invention are located on the same switch body, and are cast once, fully ensuring the concentricity of the three contacts, so that the transmission is reliable, the movable moving contact is The bracelet fingers in the sliding guide holes on the contact base are elastically in close contact, and the contact is guilty.

9. The invention adopts the insulated screw drive, the transmission is stable, accurate and no noise. At the same time, due to the linear transmission of the isolated moving contact, the tubular connection between the isolated moving contact and the bracelet contact in the contact base is adopted. The structure can greatly improve the thermal stability of the power products.

10. The isolated moving contact of the present invention adopts a tubular structure, and the isolated moving contact of the structure has large current carrying capacity and good heat dissipation performance.

11. The vacuum interrupter, the lower lead busbar, the lower wire contact and the switch body of the present invention are molded at one time.

The invention has reasonable design, relatively simple manufacturing process, small volume, light weight, stable performance and reliable action, and has strong practicability and advancement in economy saving or in electrical product application, and has extremely high Electrical safety performance is a strong guarantee for power supply reliability. Reduce the preconditions for user investment. It should be noted that changes or modifications made without departing from the spirit and scope of the invention are within the scope of the invention.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing the internal structure of the present invention. 2 is a top plan view of the busbar chamber of the present invention.

detailed description

Example

The manufacture and installation of the epoxy cast three-chamber solid insulated switch is highly technical and technical. The entire switch is formed by the thin metal sheet of the housing 13 to be separated from the surrounding environment for protection and isolation. As shown in Figures 1 and 2. The epoxy cast three-chamber solid insulated switch comprises a housing 13 and three switch bodies 7 of the same structure corresponding to AC three phases, B, C mounted in the housing 13.

The switch body 7 includes a compartment 21, a vacuum interrupter compartment 19 and a fuse compartment 27; the vacuum interrupter compartment 19 is located in the middle of the switch body 7, and the compartment 21 is located above the vacuum interrupter compartment 19, the fuse compartment 27 Located under the vacuum interrupter compartment 19; the compartment 21 includes an isolating switch 29, a busbar contact 30, an isolated moving contact 16, a grounding contact 22, an isolating contact 14 and an intermediate contact 17; the busbar contact 30 is in isolation At the top of the switch 29, the bottom of the busbar contact 30 is provided with a busbar 15 and is fixedly connected with one end of the busbar 15, and the other end of the busbar 15 is fixedly connected with the isolating contact 14; epoxy cast three-chamber solid insulated switch Since it is composed of three switch bodies 7 having the same structure, the bus bar contacts 30 are three, which are respectively disposed on the right side, the center, and the left of the upper portion of the corresponding isolating switch 29.

The grounding contact 22 and the isolating contact 14 are fixedly mounted on the lower ends of the two ends of the isolating switch 29, respectively. The lower portion of the intermediate portion is fixedly provided with the intermediate contact 17; the lower portion of the isolating contact 14, the intermediate contact 17 and the grounding contact 22 are respectively provided with the same contact base 11 , and the three contact bases 11 are located at the same horizontal line. The three contact bases 11 are absolutely concentric under the fixing of the casting mold, and the center of the contact base 11 is provided with a sliding guide hole 23; the sliding guide hole 23 is provided with a commercially available finished part bracelet finger, and the sliding guide hole 23 is arranged a lead screw 25, the front end of the lead screw 25 is fixedly coupled with the insulating nut 18, and the rear end of the lead screw 25 is coupled with the operating mechanism 24;

The movable moving contact 16 has the same tubular shape, and the center of the movable moving contact 16 is provided with a through hole 31. One end of the isolated moving contact 16 is provided with a insulating nut 18, and the isolated moving contact 16 is fixedly connected with the insulating nut 18, and is insulated. The nut 18 is sleeved on the lead screw 25 and is rotatably connected with the lead screw 25;

The isolating switch 29, the grounding contact 22, the bus bar contact 30, the isolating contact 14 and the intermediate contact 17 are cast into a fully sealed integrated structure by a known technique; the isolating switch 29 has three operations of closing, opening and grounding. The state, the grounding state is designed to make the isolating switch 29 in a safe state, that is, the moving contact always moves backward as the screw rotates, and the front end of the final moving contact is in contact with the bracelet finger in the intermediate contact. The rear end of the movable contact is in contact with the bracelet contact finger in the ground contact to complete the grounding process.

The vacuum interrupter chamber 19 includes a vacuum interrupter 9 and an insulating rod 20; the rear end of the insulating rod 20 is connected to the rotating member 26 of the operating mechanism 24 at the right end of the switch body 7, and the front end and the arc extinguishing of the insulating rod (20) The movable end 10 of the chamber 9 is connected and fastened to one end of the upper soft joint 12, and the other end of the upper soft joint 12 is fastened to the bottom end of the contact base 11 of the intermediate contact 17; 9 The movable end 10 and the static end 8 of the vacuum interrupter 9 are located at both ends of the vacuum interrupter 9; The fuse compartment 27 includes a fuse 5, a front contact 6, a rear contact 4, an insulating plug 28 and a cable lead The device 3; the fuse 5 is located at the front of the fuse compartment 27, the rear of the fuse compartment 27 is provided with an insulating plug 28, the insulating plug 28 is closely connected with the fuse 5, and the front contact 6 and the rear contact 4 are respectively Installation At the front end and the rear end of the fuse 5, the static end 8 of the vacuum interrupter 9 is fastened to the front contact 6 by screws, and the rear contact 4 is fastened to the cable entry and exit device 3; the fuse 5 and the front contact 6 and the rear contact 4 concentric, and closely cooperate with the bulkhead to function as a fixed support fuse 5, the fuse 5 can be replaced by rotating the insulation plug 28;

The cable lead device 3 includes a cable holder contact 1 and an external cable plug 2; the cable holder contact 1 is disposed at the bottom end of the fuse compartment 27 and is fixedly connected to the switch body 7, and the external cable plug 2 and the cable holder contact 1 are tightly connected. Solid connection. The switch body 7 is a single body. The present invention is a combination of three switch bodies 7 and is cast into a unitary structure by a known epoxy casting technique. On the outer shape, three bus bar contacts 30 are provided at the top for installation and maintenance. It is convenient to set the positions of the three bus bar contacts 30 to the left, center, and right. There are three cable holder contacts 1 at the bottom. The interior has three identical compartments 21, three identical vacuum interrupter compartments 19 and three identical fuse compartments 27.

Claims

Rights request

1. An epoxy cast three-chamber solid insulated switch comprising a housing and three switch body (7) mounted in the housing corresponding to alternating current three phases eight, B, C, characterized in that:

The switch body (7) comprises a cofferdam (21), a vacuum interrupter compartment (19) and a fuse compartment (27); the vacuum interrupter compartment (19) is located in the middle of the switch body (7), the compartment (21) Located above the vacuum interrupter compartment (19), the fuse compartment (27) is located below the vacuum interrupter compartment (19);

The cofferdam (21) includes an isolating switch (29), a bus bar contact (30), an isolating moving contact (16), a grounding contact (22), an isolating contact (14), and an intermediate contact (17);

The busbar contact (30) is located at the top of the isolating switch (29). The busbar contact (30) has a busbar (15) at the bottom and is fixedly connected to one end of the busbar (15). One end is fixedly connected to the isolating contact (14);

The grounding contact (22) and the isolating contact (14) are respectively fixed at the lower ends of the isolating switch (29), and the intermediate contact (17) is fixed at the lower part of the middle portion; the isolating contact (14), The lower part of the intermediate contact (17) and the ground contact (22) are respectively provided with the same contact base (11), the three contact bases (11) are located at the same horizontal line, and the center of the contact base (11) is provided Sliding guide hole (23); sliding guide hole (23) is provided with a bracelet finger, a sliding screw (23) is provided with a lead screw (25), and the front end of the lead screw (25) is fixedly connected with the insulating nut (18) , the rear end of the lead screw (25) is coupled to the operating mechanism (24);

The above-mentioned isolated moving contact (16) has a tubular shape, and the center of the isolated moving contact (16) is provided with a through hole (31), and one end of the isolated moving contact (16) is provided with a insulating nut (18), which is isolated and touched. The head (16) is fixedly connected to the insulating nut (18), and the insulating nut (18) is sleeved on the lead screw (25) and is connected to the wire Bar (25) is rotated;

The isolating switch (29), the grounding contact (22), the bus bar contact (30), the isolating contact (14) and the intermediate contact (17) are cast into a fully sealed integrated structure by epoxy resin;

The vacuum interrupter compartment (19) comprises a vacuum interrupter (9) and an insulating tie rod (20); a rear end of the insulating tie rod (20) and a rotation of the operating mechanism (24) at the right end of the switch body (7) The component (26) is connected, the front end of the insulating rod (20) is connected with the moving end (10) of the arc extinguishing chamber (9), and is fastened to the end of the upper soft connecting (12), and the soft connection is connected. The other end is fastened to the bottom end of the contact base (11) of the intermediate contact (17);

The fuse compartment (27) comprises a fuse (5), a front contact (6), a rear contact (4), an insulating plug (28) and a cable lead device (3); the fuse (5) is located at the fuse At the front of the chamber (27), the fuse box (27) is provided with an insulating plug (28) at the rear, the insulating plug (28) is tightly connected to the fuse (5), the front contact (6) and the rear The contact bases (4) are respectively installed at the front end and the rear end of the fuse (5), and the vacuum interrupter (9) and the front contact (6) are fastened by screws, and the rear contact seat (4) ) is fastened to the cable entry and exit lead device (3); the fuse (5) is concentric with the front contact (6) and the rear contact (4);

The cable lead device (3) comprises a cable holder contact (1) and an external cable plug (2); the cable holder contact (1) is disposed at a bottom end of the fuse compartment (27) and is connected to the switch body (7) ) Fixed connection, the external cable plug (2) is fastened to the cable holder contact (1).

The epoxy cast three-chamber solid insulated switch according to claim 1, wherein said switch body (7) is cast by epoxy resin.

3. The epoxy cast three-chamber solid insulated switch according to claim 1, wherein: said busbar contacts (30) are three, respectively disposed on the right side and the center of the upper portion of the corresponding isolating switch (29). And the left side.