CN109962427A - A three-position isolating switch and gas-insulated metal-enclosed switchgear gas box - Google Patents

Abstract

The invention discloses a three-station isolating switch and a gas box of a gas-insulated metal-enclosed switchgear. A moving knife blade is hingedly mounted on a moving knife support and can rotate around the hinge point; one end of the moving knife arm is fixedly connected to the moving knife On the blade, the other end is connected with one end of the insulating pull rod, the other end of the insulating pull rod is connected with the transmission arm, and the transmission arm is fixedly connected with the central rotating shaft of the worm wheel; the worm wheel is meshed and connected with the worm, and the worm is connected with the isolation operating mechanism; the main knife contact It is located above the movable knife blade, and the grounding 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 forward and backward to drive the worm wheel to rotate, which in turn passes through the transmission arm and the insulating pull rod. , The moving knife arm drives the moving knife blade to rotate around the hinge point, so that the contact of the moving knife blade can realize rotary opening, closing or grounding by rotating between the main knife contact and the grounding contact.

Description

A three-position isolating switch and gas-insulated metal-enclosed switchgear gas box

technical field

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

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 the medium-voltage power distribution equipment is very important for the safe and continuous operation of the entire power grid. Gas-insulated metal-enclosed switchgear gas box and three-position disconnecting switch, referred to as C-GIS, C-GIS equipment is a power distribution equipment developed at the end of the last century and specially used in medium voltage systems. It has developed rapidly at the beginning of this century, making the C-GIS manufacturing industry rise rapidly, and the manufacturing technology advances 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 three-position isolation switch and a gas-insulated metal-enclosed switchgear gas box.

Technical scheme: in order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:

A three-position isolation switch, comprising: a grounding contact electrically connected with a grounding circuit, a main knife contact electrically connected with a busbar, a moving knife blade, a moving knife support, a moving knife arm, an insulating pull rod, a transmission arm, Turbine shaft;

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.

As a preferred solution, in the three-position isolating switch, the transmission arm and the central rotating shaft of the worm gear are fixedly connected by splines.

On the other hand, the present invention also provides a gas-insulated metal-enclosed switchgear gas box, comprising a gas box body, and the above-mentioned three-position isolating switch and circuit breaker are installed in the gas box box;

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

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.

Further, the gas-insulated metal-enclosed switchgear gas box also includes an outlet bushing, the outlet bushing is located at the front of the gas box body, and is arranged on the left, middle and right; the circuit breaker is connected to the outlet copper bar and passes through the outlet bushing. The tube passes out of the air box body.

As a preferred solution, it also includes a grounding portion, the grounding portion is located at the rear of the air box, the upper end of the grounding portion is fixedly connected to the grounding contact, and the lower end of the grounding portion leads the grounding current to the outside of the air box through the grounding copper block.

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.

Further, the A-phase busbar extension sleeve, the B-phase busbar extension sleeve, and the C-phase busbar extension sleeve are installed on the top of the gas box, or installed on one side of the gas box.

As a preferred solution, the bottom of the air box body is provided with an air box pressure relief flange.

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 gas box further includes a support plate, which is used to assemble and support the central shaft of the worm gear; the support plate is fixed on the inner wall of the gas box.

Further, the air box body is made of metal material.

Beneficial effects: The gas-insulated metal-enclosed switchgear gas box and the three-position isolating switch provided by the present invention have the following advantages:

1. The three-position 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. 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.

3. 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.

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. The circuit breaker mechanism has various forms, which can be spring or permanent magnet.

5. The air box is equipped with multiple safety measures to protect the operator, such as three-station isolation position observation window, pressure relief flange, etc.

6. The pressure relief flange is made of thin plate, and 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.

Description of drawings

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

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

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

Fig. 4, Fig. 5 are the structural schematic diagrams of the three-position isolating switch of the embodiment;

Fig. 6 is the grounding schematic diagram of the three-position isolating switch of the embodiment;

Fig. 7 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, gas box body 3, isolation operating mechanism 4, circuit breaker operating mechanism 5;

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 FIG. 4 and FIG. 5, a three-position isolation switch 1 includes: a grounding contact 101 electrically connected to a grounding circuit, a main knife contact 102 electrically connected to a bus bar, a moving knife blade 103, and a moving knife support 104. The movable knife arm 105, the insulating pull rod 106, the transmission arm 107, the worm wheel 108, and the 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 through a pin, and the transmission arm 107 is fixedly connected with the central axis of the worm gear 108;

As shown in FIG. 5 , the worm wheel 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. 6 , the contact of the movable knife blade 103 is in contact with the grounding contact 101 , so that the three-position disconnector 1 is in the grounding position.

As shown in FIG. 7 , the contact of the movable 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. 4 , the transmission arm 107 and the central rotating shaft of the worm gear 108 are fixedly connected by splines.

Example 2

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, a gas-insulated metal-enclosed switchgear gas box includes a gas box box body 3, and the three-way switchgear in the above-mentioned embodiment is installed in the gas box box body 3 Bit isolating switch 1 and circuit breaker;

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 isolation switch is fixed at the rear end of the circuit breaker pole 2;

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 pole 2 is disconnected by operating the circuit breaker operating mechanism 5 .

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.

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

In some embodiments, as shown in FIG. 1 , 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 expansion 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 .

In some embodiments, as shown in FIG. 1 , 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. 1 , 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 FIG. 1 and FIG. 5 , the gas-insulated metal-enclosed switchgear gas box further includes a support plate 307, and the support plate 307 is used to assemble and support the central shaft of the worm gear 108; The support plate 307 is fixed on the inner wall of the air box body 3 .

As a preferred solution, the air box body 3 is made of metal.

In the gas-insulated metal-enclosed switchgear gas box provided by the present invention, the three-position isolating switch 1 adopts a rotary knife switch type, the knife switch is fixed at the rear end of the circuit breaker pole 2, and the circuit breaker pole 2 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 phase sequence of the busbar is front, middle and rear, and the phase sequence of the outgoing line is arranged in the left, middle and right.

5. The bottom of the air box body 3 is provided with an air box pressure relief flange 305, which is used to communicate with the pressure relief channel. 7. A special air chamber partition 701 is provided between the high-voltage cable chamber 6 and the pressure relief channel chamber 7.

6. The circuit breaker mechanism can be operated by spring or permanent magnet.

7. The air box is equipped with a three-station isolation fracture observation window, and the operator and maintenance personnel can know the real-time position of the three-station at any time.

8. An insulating tie rod is used between the movable knife arm and the transmission arm to ensure sufficient electrical distance.

9. The isolation operating mechanism acts on the worm gear and the worm, and through the cooperation between the worm gear and the worm, the movable knife blade is in the opening and closing and grounding positions respectively.

The gas-insulated metal-enclosed switchgear air box of the present invention adopts a stainless steel plate welding structure, adopts laser welding technology, synchronous vacuuming and inflation technology, SF6 gas leak detection technology, adopts a new solid interface insulation plugging technology, and is applied to various gas For connection between rooms, cabinets and external high-voltage components such as voltage transformers and arresters, the insulating medium can be compressed air, N2 and SF6 and other insulating gases. In the design and production process of the equipment, explosion-proof membranes and pressure release channels are designed, so that the probability of maintenance personnel being injured by accidents is almost zero. The transmission part adopts mechanical gears with high reliability.

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 three-station isolating switch, is characterized in that, comprises: the grounding contact that is electrically connected with the grounding loop, the main knife contact that is electrically connected with the busbar, the moving knife blade, the moving knife support, the moving knife turning arm, the insulation Pull rod, transmission 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. 2 . The three-position isolating switch according to claim 1 , wherein the transmission arm and the central rotating shaft of the worm gear are fixedly connected by splines. 3 . 3. A gas-insulated metal-enclosed switchgear gas box, characterized in that it comprises a gas box body, characterized in that the three-position isolating switch according to claim 1 or 2 and the breaker; An isolation operating mechanism and a circuit breaker operating mechanism are installed at the front of the air box body; the isolation operating mechanism and the circuit breaker operating mechanism are arranged up and down; 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. 4 . The gas-insulated metal-enclosed switchgear gas box according to claim 3 , further comprising an outlet bushing, the outlet bushing is located at the front of the gas box body, and is arranged on the left, middle and right; the circuit breaker and the outlet After the copper bar is connected, it goes out of the air box through the outlet sleeve. 5 . The gas-insulated metal-enclosed switchgear gas box according to claim 3 , further comprising a grounding portion, the grounding portion is located at the rear of the gas box, and the upper end of the grounding portion is fixedly connected to a grounding contact, and the grounding portion is grounded. 6 . Part of the lower end leads the ground current to the outside of the air box through the ground copper block. 6 . The gas-insulated metal-enclosed switchgear gas box according to claim 3 , wherein the gas box body is further provided with a busbar expansion bushing; the busbar expansion bushing comprises an A-phase busbar expansion bushing. 7 . , B-phase busbar expansion sleeve, C-phase busbar expansion sleeve. 7. The gas-insulated metal-enclosed switchgear gas box according to claim 6, wherein the A-phase busbar extension sleeve, the B-phase busbar extension sleeve, and the C-phase busbar extension sleeve are mounted on the top of the gas box body , or installed on the side of the air box. 8 . The gas-insulated metal-enclosed switchgear gas box according to claim 3 , wherein a gas box pressure relief flange is provided at the bottom of the gas box body. 9 . 9 . The gas-insulated metal-enclosed switchgear gas box according to claim 3 , wherein the front part of the gas box is provided with an isolation fracture observation window for the operator to observe the isolation position. 10 . 10 . The gas-insulated metal-enclosed switchgear gas box according to claim 3 , further comprising a support plate, the support plate is used to assemble and support the central shaft of the worm wheel; the support plate is fixed on the gas. 11 . on the inner wall of the box.