CN109962426A - A gas-insulated metal-enclosed switchgear - Google Patents

Abstract

The invention discloses a gas-insulated metal-enclosed switchgear. The cabinet is provided with a bus bar room, an air box, a pressure relief flange of the gas box, a pressure relief channel room, a high-voltage cable room, a secondary instrument box and a mechanism operation room; A three-position isolation switch and circuit breaker are installed inside; the mechanism operating room is located at the front of the air box, and the isolation operating mechanism and the circuit breaker operating mechanism are installed in the mechanism operating room; the high-voltage cable room and the pressure relief channel room are located at the bottom of the gas box. The high-voltage cable room and the pressure relief channel room are separated by an air chamber partition; the air box pressure relief flange is installed at the bottom of the air box body and communicated with the pressure relief channel room; the circuit breaker in the air box is connected to the copper outlet. After the row is connected, it enters the high-voltage cable room through the outlet sleeve and goes out of the gas box; the secondary instrument box is installed on the gas box; the busbar room is located on the top or side of the gas box; the busbar in the gas box passes through the busbar The expansion sleeve is arranged in the busbar chamber after passing through the air box body.

Description

A gas-insulated metal-enclosed switchgear

technical field

The invention belongs to the technical field of power transmission and distribution equipment manufacturing, and in particular relates to a gas-insulated metal-enclosed switchgear.

Background technique

In the current power supply network system in my country, in order to improve the reliability of power supply, with the rapid development of contemporary social economy and modern industrial technology, the demand for power is increasing in various industries, especially the medium-voltage power distribution system. The whole power distribution system plays the role of "connecting the previous and the next" and occupies a very important position. Therefore, the performance of medium-voltage power distribution equipment is very important for the safe and continuous operation of the entire power grid. Gas-insulated metal-enclosed switchgear, referred to as C-GIS, is a power distribution device developed at the end of the last century and specially used in medium-voltage systems. With the development, the C-GIS manufacturing industry has risen rapidly, and the manufacturing technology has advanced by leaps and bounds.

Around 2000, medium-voltage C-GIS equipment developed by leaps and bounds, and new technologies, structures, processes, and equipment entered the stage of promotion and use. The technical parameters and reliability of the product are further improved, and the size is further reduced.

SUMMARY OF THE INVENTION

Objective: In order to overcome the deficiencies in the prior art, the present invention provides a gas-insulated metal-enclosed switchgear.

A gas-insulated metal-enclosed switchgear includes a cabinet, wherein a busbar room, a gas box, a pressure relief flange of the gas box, a pressure relief passage room, a high-voltage cable room, a secondary instrument box, and a mechanism operation room are arranged in the cabinet;

A three-position isolating switch and a circuit breaker are installed in the air box;

The mechanism operation room is located at the front of the air box body, and the isolation operation mechanism and the circuit breaker operation mechanism are installed in the mechanism operation room; the isolation operation mechanism and the circuit breaker operation mechanism are arranged up and down;

The high-voltage cable chamber and the pressure relief passage chamber are located at the bottom of the air box, and the high-voltage cable chamber and the pressure relief passage chamber are separated by an air chamber partition;

The air box pressure relief flange is mounted on the bottom of the air box body and communicated with the pressure relief passage chamber;

The circuit breaker in the air box is connected to the outgoing copper bar after passing through the outgoing conduit and passing out of the air box, and then enters the high-voltage cable room;

The secondary instrument box is installed on the air box body;

The busbar chamber is located on the top or side of the gas box body; the busbars in the gas box are arranged in the busbar chamber after passing through the gas box body through the busbar expansion sleeve.

As a preferred solution, the three-position isolating switch includes a grounding contact electrically connected to the grounding circuit, a main knife contact electrically connected to the busbar, a moving knife blade, a moving knife support, a moving knife turning arm, an insulating pull rod, a transmission turning Arm, worm gear, worm;

The movable knife blade is hingedly mounted on the movable knife support and can rotate around the hinge point; one end of the movable knife arm is fixedly connected to the movable knife blade, the other end is connected to one end of the insulating pull rod, and the other end of the insulating pull rod is connected to the transmission The crank arm is connected, and the transmission crank arm is fixedly connected with the central rotating shaft of the worm wheel;

the worm gear is meshed and connected with the worm, and the worm is connected with the isolation operating mechanism;

The main knife contact is located above the movable knife blade, and the ground contact is located behind the movable knife blade;

Under the active force of the isolation operating mechanism, through the mutual cooperation and action of the worm and the worm wheel, the worm wheel moves back and forth to drive the worm wheel to rotate, and the moving knife blade rotates around the hinge point through the drive arm, the insulating pull rod, and the moving knife arm in turn. The contact of the moving knife blade is rotated between the main knife contact and the grounding contact to realize rotary opening, closing or grounding.

Further, in the gas-insulated metal-enclosed switchgear, the transmission arm and the central rotating shaft of the worm gear are fixedly connected by splines.

As a preferred solution, the air box includes an air box body, and a three-position isolating switch and a circuit breaker are installed in the air box body;

The movable knife support of the three-position isolating switch is fixed at the rear end of the pole column of the circuit breaker;

The lower ends of the poles of each phase circuit breaker are respectively supported and fixed by pole support insulators;

The worm of the three-position isolation switch is connected with the isolation operating mechanism, and the rotary opening and closing or grounding is realized by operating the isolation operating mechanism;

The transmission part of the circuit breaker is connected with the circuit breaker operating mechanism, and the vacuum interrupter in the circuit breaker can be disconnected by operating the circuit breaker operating mechanism.

As a preferred solution, the outlet bushing is located at the front of the air box, and is arranged on the left, middle and right; after the circuit breaker is connected to the outlet copper bar, it passes through the outlet bushing and goes out of the gas box.

As a preferred solution, the gas-insulated metal-enclosed switchgear further includes a grounding portion, the grounding portion is located at the rear of the gas box, the upper end of the grounding portion is fixedly connected to the grounding contact, and the lower end of the grounding portion is grounded through a grounding copper block. The current is led to the outside of the air box.

As a preferred solution, a busbar extension sleeve is also installed on the gas box body; the busbar extension sleeve includes an A-phase busbar extension sleeve, a B-phase busbar extension sleeve, and a C-phase busbar extension sleeve.

As a preferred solution, the front part of the air box body is provided with an isolation fracture observation window, which is used for the operator to observe the isolation position.

As a preferred solution, the gas-insulated metal-enclosed switchgear further includes a support plate, which is used for assembling and supporting the central rotating shaft of the worm gear; the support plate is fixed on the inner wall of the gas box.

As a preferred solution, the cabinet body adopts a stainless steel plate welded structure.

In addition, the circuit breaker pole is made of epoxy resin or composite insulating material, and the vacuum bubble can be solid-sealed or installed in epoxy resin or composite insulating material later. The electric field of the charged part can be improved by means of feeder and other methods, and the corresponding insulation level can be achieved even under normal atmospheric pressure.

Beneficial effects: The gas-insulated metal-enclosed switchgear provided by the present invention has the following advantages:

1. The isolating switch adopts the round copper knife gate type to increase the insulation capacity of the fracture. The isolating switch adopts the rotary knife switch type, and the knife switch is fixed at the rear end of the pole column of the circuit breaker.

2. There is a pressure relief flange at the bottom of the air box. The pressure relief flange is made of thin plate. The weakest part of the cabinet is located at the bottom of the air box. The release channel is dedicated and isolated from the environment. The cabinet is provided with a special pressure relief channel, and eventually the gas will enter the cable trench. A special partition is provided to separate the cable room and the pressure relief channel.

3. The busbar expansion sleeve can be expanded from the top of the cabinet, or can be expanded from the side of the cabinet. The invention adopts a variety of voltage equalization and insulation means, and can realize miniaturization.

4. The poles of the circuit breaker can be pre-sealed with vacuum bubbles or installed later, which can be selected flexibly to meet the requirements of different users.

5. The present invention has a simple structure, is easy to produce and organize, and is maintenance-free.

Description of drawings

1 is a front view of a gas-insulated metal-enclosed switchgear of an embodiment;

2 is a front view of the gas-insulated metal-enclosed switchgear of the embodiment;

3 is a bottom view of the gas-insulated metal-enclosed switchgear of the embodiment;

4 is a top view of the gas-insulated metal-enclosed switchgear of the embodiment;

5 to 7 are schematic diagrams of the structure of the air box in the embodiment;

Fig. 8, Fig. 9 are the structural representations of the three-position isolating switch in the embodiment air box;

Fig. 10 is the grounding schematic diagram of the three-station isolating switch of the embodiment;

Fig. 11 is the closing schematic diagram of the three-position isolating switch of the embodiment;

In the figure: three-position isolation switch 1, circuit breaker pole 2, air box body 3, isolation operating mechanism 4, circuit breaker operating mechanism 5, high-voltage cable room 6, pressure relief channel room 7, secondary instrument box 8, Mechanism operation room 9, busbar room 10;

Ground contact 101, main knife contact 102, movable knife blade 103, movable knife support 104, movable knife arm 105, insulating pull rod 106, transmission arm 107, worm wheel 108, worm 109; pole support insulator 201, copper outlet Row 202, outlet bushing 301, grounding part 302, grounding copper block 303; busbar expansion bushing 304, air box pressure relief flange 305, isolation fracture observation window 306, support plate 307;

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the invention unless specifically stated otherwise. Meanwhile, it should be understood that, for the convenience of description, the dimensions of various parts shown in the accompanying drawings are not drawn in an actual proportional relationship. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the authorized description. In all examples shown and discussed herein, any specific value should be construed as illustrative only and not as limiting. Accordingly, other examples of exemplary embodiments may have different values. It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

Example 1

As shown in Figure 1, Figure 2, Figure 3, Figure 4, a gas-insulated metal-enclosed switchgear includes a cabinet body, and the cabinet body is provided with a busbar room 10, an air box, a pressure relief channel room 7, and a high-voltage cable room 6. Secondary instrument box 8, mechanism operating room 9;

The air box is equipped with a three-position isolation switch 1 and a circuit breaker;

The isolation operating mechanism 4 and the circuit breaker operating mechanism 5 are installed in the mechanism operating room 9; the isolation operating mechanism 4 and the circuit breaker operating mechanism 5 are arranged up and down;

The high-voltage cable chamber 6 and the pressure relief channel chamber 7 are located at the bottom of the air box body 3, and the high-voltage cable chamber 6 and the pressure relief channel chamber 7 are provided with an air chamber partition 701 for separation;

The air box pressure relief flange 305 is mounted on the bottom of the air box body 3, and communicates with the pressure relief channel chamber 7;

The circuit breaker in the air box is connected to the outgoing copper bar 202 after passing through the outgoing conduit 301 and passing out of the air box body 3, and then enters the high-voltage cable room 6;

The secondary instrument box 8 is installed on the air box body 3;

The busbar chamber 10 is located on the top or side of the gas box body 3 ; the busbars in the gas box are arranged in the busbar chamber 10 after passing through the gas box box body 3 through a busbar expansion sleeve 304 .

In some embodiments, as shown in FIGS. 5 to 7 , the air box includes an air box body 3, and a three-position disconnector 1 and a circuit breaker are installed in the air box body 3;

An isolation operating mechanism 4 and a circuit breaker operating mechanism 5 are installed at the front of the air box body 3; the isolation operating mechanism 4 and the circuit breaker operating mechanism 5 are arranged up and down;

The movable knife support 104 of the three-position isolating switch is fixed at the rear end of the circuit breaker pole;

The lower ends of the poles 2 of each phase circuit breaker are respectively supported and fixed by pole support insulators 201, which are used to ensure the strength of the isolating switch and the circuit breaker.

The worm 109 of the three-position isolation switch 1 is connected to the isolation operating mechanism 4, and the rotary opening and closing or grounding is realized by operating the isolation operating mechanism 4;

The transmission part of the circuit breaker is connected with the circuit breaker operating mechanism 5 , and the vacuum interrupter in the circuit breaker can be disconnected by operating the circuit breaker operating mechanism 5 .

In some embodiments, as shown in FIG. 8 and FIG. 9 , a three-position isolation switch 1 includes: a ground contact 101 electrically connected to a ground loop, a main tool contact 102 electrically connected to a bus bar, and a moving blade 103. Moving knife support 104, moving knife arm 105, insulating pull rod 106, transmission arm 107, worm wheel 108, worm 109;

The movable knife blade 103 is hingedly mounted on the movable knife support 104, and can rotate around the hinge point; one end of the movable knife arm 105 is fixedly connected to the movable knife blade 103, and the other end is connected to one end of the insulating pull rod 106 through a bolt and nut Connection, the other end of the insulating pull rod 106 is connected with the transmission arm 107, and the transmission arm 107 is fixedly connected with the central rotating shaft of the worm gear 108;

As shown in FIG. 9 , the worm gear 108 is engaged with the worm 109, and the worm 109 is connected with the isolation operating mechanism 4;

The main knife contact 102 is located above the movable knife blade 103, and the ground contact 101 is located behind the movable knife blade 103;

Under the active force of the isolation operating mechanism 4, through the mutual cooperation and action of the worm 109 and the worm wheel 108, the worm 109 moves back and forth to drive the worm wheel 108 to rotate, which is sequentially driven by the transmission arm 107, the insulating pull rod 106, and the movable knife arm 105. The knife blade 103 rotates around the hinge point, so that the contact of the movable knife blade 103 rotates between the main knife contact 102 and the grounding contact 101 to realize rotary opening, closing or grounding. The three-position isolating switch 1 adopts a rotary type, and is driven by a worm 109 and a worm gear 108, and the overall operation is more convenient and fast.

As shown in FIG. 10 , the contact of the movable blade 103 is in contact with the ground contact 101 , so that the three-position isolation switch 1 is in the grounding position.

As shown in FIG. 11 , the contact of the moving knife blade 103 is in contact with the main knife contact 102 , so that the three-position isolation switch 1 is in the closed position.

As a preferred solution, in some embodiments, as shown in FIG. 8 , the transmission arm 107 and the central rotating shaft of the worm gear 108 are fixedly connected by splines.

In some embodiments, as shown in FIG. 1 , the gas-insulated metal-enclosed switchgear gas box further includes an outlet bushing 301 . The outlet bushing 301 is located at the front of the gas box body 3 , and is arranged on the left, middle and right sides. ; After the circuit breaker is connected to the outgoing copper bar 202, it passes through the outgoing casing 301 and goes out of the air box body 3.

In the gas-insulated metal-enclosed switchgear gas box, the grounding part 302 is located at the rear of the gas box body 3 , the upper end of the grounding part 302 is fixedly connected to the grounding contact 101 , and the lower end of the grounding part 302 leads the grounding current through the grounding copper block 303 . to the outside of the air box body 3.

In some embodiments, as shown in FIG. 5 , a busbar extension sleeve 304 is also installed on the gas box body 3 ; the busbar extension sleeve 304 includes an A-phase busbar extension sleeve and a B-phase busbar extension sleeve , C-phase bus extension sleeve. The A-phase busbar extension sleeve, the B-phase busbar extension sleeve, and the C-phase busbar extension sleeve can be installed on the top of the air box body 3 or on one side of the air box body 3 . The busbar compartment 10 adopts the method of top expansion of the cabinet body or side expansion of the cabinet body according to the installation position of the busbar expansion sleeve.

In some embodiments, as shown in FIG. 5 , the bottom of the air box body 3 is provided with an air box pressure relief flange 305 .

In some embodiments, as shown in FIG. 5 , the front part of the air box body 3 is provided with an isolation fracture observation window 306 for the operator to observe the isolation position.

In some embodiments, as shown in FIGS. 5 , 8 and 9 , the gas-insulated metal-enclosed switchgear gas box further includes a support plate 307 for assembling and supporting the center of the worm gear 108 The rotating shaft; the support plate 307 is fixed on the inner wall of the air box body 3 .

As a preferred solution, the cabinet body is a stainless steel plate welded structure.

In the gas-insulated metal-enclosed switchgear provided by the present invention, the three-position isolating switch 1 adopts a rotary knife switch type, the movable knife support of the movable knife switch is fixed at the rear end of the circuit breaker, and the pole 2 of the circuit breaker adopts epoxy resin or composite insulation Materials, vacuum bubbles can be solid-sealed or installed in epoxy resin or composite insulating materials later. The exposed live parts use circular pressure equalizers, flat round feeders, etc. to improve the electric field of the live parts, even under normal atmospheric pressure. The corresponding insulation level can also be achieved.

2. The load switch transmission is directly driven by the main shaft, and the moving knife blade is rotated through the transmission.

3. The insulating gas can be dry air, high-purity nitrogen or SF ₆ and other insulating gases.

4. The sealed air box is in the form of laser welding, and the changes in the internal environment are monitored by barometers, humidity indicators, etc. to ensure high reliability of insulation.

5. The busbar expansion sleeve 304 can be expanded from the top of the cabinet, or can be expanded from the side of the cabinet.

6. The bottom of the air box box 3 is provided with an air box pressure relief flange 305, and the cabinet body is provided with a special pressure relief channel chamber 7, and finally the gas will enter the cable trench.

7. A special air chamber partition 701 is provided between the high-voltage cable chamber 6 and the pressure relief channel chamber 7.

The gas-insulated metal-enclosed switchgear of the present invention adopts stainless steel plate welding structure, adopts laser welding technology, synchronous vacuuming and inflation technology, SF ₆ gas leak detection technology, adopts new solid interface insulation plugging technology, and is applied to each gas chamber The connection between external high-voltage components such as voltage transformers and arresters, etc., can be used as the insulating medium, such as compressed air, N ₂ and SF ₆ . In the design and production process of the equipment, the explosion-proof membrane and the pressure release channel are designed, so that the probability of maintenance personnel being injured by accidents is almost zero. The fully-sealed cabinet structure completely isolates the conductors and some high-voltage components from the external environment, thereby avoiding the effects of damp heat, condensation, and air pollution caused by weather and environmental changes. Laser welding technology, new solid insulation interface plug-in technology And the application of silica gel material greatly improves the sealing performance between the air chambers of the cabinet, the cabinet and the external environment, and the strength of the cabinet.

In the description of this application, it should be understood that the terms "center", "portrait", "horizontal", "front", "rear", "left", "right", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or obscuring It means that the referred device or element must have a specific orientation, be constructed and operate for a specific orientation, and therefore cannot be understood as a limitation on the protection content of the present invention.

The above is only the preferred embodiment of the present invention, it should be pointed out that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made, and these improvements and modifications are also It should be regarded as the protection scope of the present invention.

Claims (10)

1. A gas-insulated metal-enclosed switchgear, comprising a cabinet, characterized in that the cabinet is provided with a bus bar room, an air box, a pressure relief flange for the gas box, a pressure relief passage room, a high-voltage cable room, a secondary instrument box, agency operating room; A three-position isolating switch and a circuit breaker are installed in the air box; The mechanism operation room is located at the front of the air box body, and the isolation operation mechanism and the circuit breaker operation mechanism are installed in the mechanism operation room; the isolation operation mechanism and the circuit breaker operation mechanism are arranged up and down; The high-voltage cable chamber and the pressure relief passage chamber are located at the bottom of the air box, and the high-voltage cable chamber and the pressure relief passage chamber are separated by an air chamber partition; The air box pressure relief flange is mounted on the bottom of the air box body and communicated with the pressure relief passage chamber; The circuit breaker in the air box is connected to the outgoing copper bar after passing through the outgoing conduit and passing out of the air box, and then enters the high-voltage cable room; The secondary instrument box is installed on the air box body; The busbar chamber is located on the top or side of the gas box body; the busbars in the gas box are arranged in the busbar chamber after passing through the gas box body through the busbar expansion sleeve. 2. The gas-insulated metal-enclosed switchgear according to claim 1, characterized in that, The three-position isolating switch includes a grounding contact electrically connected to the grounding circuit, a main knife contact electrically connected to the busbar, a moving knife blade, a moving knife support, a moving knife arm, an insulating pull rod, a transmission arm, a worm gear, worm; The movable knife blade is hingedly mounted on the movable knife support and can rotate around the hinge point; one end of the movable knife arm is fixedly connected to the movable knife blade, the other end is connected to one end of the insulating pull rod, and the other end of the insulating pull rod is connected to the transmission The crank arm is connected, and the transmission crank arm is fixedly connected with the central rotating shaft of the worm wheel; the worm gear is meshed and connected with the worm, and the worm is connected with the isolation operating mechanism; The main knife contact is located above the movable knife blade, and the ground contact is located behind the movable knife blade; Under the active force of the isolation operating mechanism, through the mutual cooperation and action of the worm and the worm wheel, the worm wheel moves back and forth to drive the worm wheel to rotate, and the moving knife blade rotates around the hinge point through the drive arm, the insulating pull rod, and the moving knife arm in turn. The contact of the moving knife blade is rotated between the main knife contact and the grounding contact to realize rotary opening, closing or grounding. 3. The gas-insulated metal-enclosed switchgear according to claim 2, characterized in that, The transmission arm and the central rotating shaft of the worm gear are fixedly connected by splines. 4. The gas-insulated metal-enclosed switchgear according to claim 2, characterized in that, The air box includes an air box body, and a three-position isolating switch and a circuit breaker are installed in the air box body; The movable knife support of the three-position isolating switch is fixed at the rear end of the pole column of the circuit breaker; The lower ends of the poles of each phase circuit breaker are respectively supported and fixed by pole support insulators; The worm of the three-position isolation switch is connected with the isolation operating mechanism, and the rotary opening and closing or grounding is realized by operating the isolation operating mechanism; The transmission part of the circuit breaker is connected with the circuit breaker operating mechanism, and the vacuum interrupter in the circuit breaker can be disconnected by operating the circuit breaker operating mechanism. 5. The gas-insulated metal-enclosed switchgear according to claim 4, wherein, The outlet bushing is located at the front of the air box body, and is arranged on the left, middle and right; the circuit breaker is connected with the outlet copper bar and passes through the outlet bushing and goes out of the air box box. 6 . The gas-insulated metal-enclosed switchgear according to claim 4 , further comprising a grounding portion, the grounding portion is located at the rear of the gas box, the upper end of the grounding portion is fixedly connected to the grounding contact, and the lower end of the grounding portion is fixedly connected to the grounding contact. 7 . Lead the ground current to the outside of the air box through the ground copper block. 7 . The gas-insulated metal-enclosed switchgear according to claim 1 , wherein a busbar expansion sleeve is also installed on the gas box body; the busbar expansion sleeve comprises an A-phase busbar expansion sleeve, a B-phase Phase busbar extension sleeve, C-phase busbar extension sleeve. 8 . The gas-insulated metal-enclosed switchgear according to claim 4 , wherein the front part of the gas box is provided with an isolation fracture observation window for the operator to observe the isolation position. 9 . 9 . The gas-insulated metal-enclosed switchgear according to claim 4 , further comprising a support plate, wherein the support plate is used for assembling and supporting the central rotating shaft of the worm gear; the support plate is fixed on the air box box. 10 . on the body wall. 10 . The gas-insulated metal-enclosed switchgear according to claim 4 , wherein the cabinet body adopts a stainless steel plate welded structure. 11 .