CN214479038U

CN214479038U - Large-breaking-capacity environment-friendly gas insulated switch cabinet

Info

Publication number: CN214479038U
Application number: CN202023221714.5U
Authority: CN
Inventors: 唐晓鹏; 孙龙; 王伟平; 齐佳伟; 张冬旭; 刘艳峰; 李宝云
Original assignee: Beijing Sojo Electric Co Ltd
Current assignee: Beijing Sojo Electric Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-10-22
Anticipated expiration: 2030-12-28

Abstract

The utility model relates to an environment-friendly gas insulated switch cabinet with large breaking capacity, which comprises a cabinet body, wherein the cabinet body is divided into a small bus chamber, a secondary control chamber, a mechanism chamber, a cable chamber, a main bus chamber, a switch chamber, a small bus chamber and a secondary control chamber, the mechanism room and the cable room are distributed on the left side of the cabinet body according to the sequence from top to bottom, the main bus room and the switch room are distributed on the right side of the cabinet body according to the sequence from top to bottom, a wire outlet sleeve and a ventilation device are installed in the cable room, a circuit breaker mechanism and an isolation mechanism are installed in the mechanism room, a current transformer, a circuit breaker assembly and an isolation switch assembly are installed in the switch room, the circuit breaker mechanism operates the circuit breaker assembly to act, the isolation mechanism operates the isolation switch assembly to act, the main bus sleeve is installed in the main bus room, the main bus sleeve, the isolation switch assembly, the circuit breaker assembly, the current transformer and the wire outlet sleeve are sequentially connected through a copper bar group. The structure is compact, the volume is small, the safety performance is high, and the heat dissipation effect is good.

Description

Large-breaking-capacity environment-friendly gas insulated switch cabinet

Technical Field

The utility model relates to an electrical equipment technical field, concretely relates to big break capacity environment-friendly gas insulated switchgear.

Background

The environment-friendly gas insulated switchgear with large breaking capacity is used for power transmission and distribution under the working conditions of a generator inlet cabinet or a power plant feeder cabinet and the like. The rated voltage is 12kV, the rated current is 3150A, and the rated short circuit breaking current is 40kA (4S). Traditional big disconnected type capacity switchgear adopts air insulation more, for solving the equipment temperature rise problem, adopts more to increase the equipment volume, installs modes such as fan increase circulation of air additional, causes the cabinet body volume of cubical switchboard great, occupies too much area. On the other hand, traditional cubical switchboard divides the cabinet setting with isolator and circuit breaker, forms corresponding isolator cabinet and circuit breaker cabinet respectively, and the space that occupies is great, and consequently switchgear's complete machine volume is also great.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a big break capacity environment-friendly gas insulated switchgear, it has compact structure, small, the security performance is high, the good advantage of radiating effect.

In order to solve the problems in the prior art, the utility model provides a large break capacity environment-friendly gas insulated switchgear, which comprises a cabinet body, wherein the cabinet body is divided into a small bus chamber, a secondary control chamber, a mechanism chamber, a cable chamber, a main bus chamber and a switch chamber, the small bus chamber, the secondary control chamber, the mechanism chamber and the cable chamber are distributed on the left side of the cabinet body from top to bottom, the main bus chamber and the switch chamber are distributed on the right side of the cabinet body from top to bottom, a wire outlet sleeve and a ventilation device are arranged in the cable chamber, a breaker mechanism and an isolation mechanism are arranged in the mechanism chamber, a current transformer, a breaker assembly and an isolation switch assembly are arranged in the switch chamber, the breaker mechanism operates the breaker assembly to act, the isolation mechanism operates the isolation switch assembly to act, the main bus sleeve is arranged in the main bus chamber, the main bus bushing, the isolating switch assembly, the breaker assembly, the current transformer and the wire outlet bushing are sequentially connected through the copper bar group.

Furthermore, the utility model relates to a big break capacity environment-friendly gas insulated switchgear, wherein, the circuit breaker subassembly includes insulating cylinder, vacuum interrupter, first conductive piece, insulating pull rod, electrically conductive slider, bellows and second conductive piece, the left end of insulating cylinder is connected with the backup pad of welding on the baffle between mechanism room and switch room, vacuum interrupter seals admittedly in the right half portion of insulating cylinder, the one end of first conductive piece is connected with the right-hand member of vacuum interrupter, and the other end of first conductive piece is connected with current transformer's incoming wire terminal through the copper bar group, insulating pull rod sets up in the left half portion of insulating cylinder and is connected with the left end of vacuum interrupter, electrically conductive slider cover is established at the right-hand member of insulating pull rod, the one end of bellows is connected with the left end of insulating pull rod, the other end of bellows and the output shaft of circuit breaker mechanism, the second conductive piece is embedded in the middle of the upper side of the insulating cylinder, the upper end of the second conductive piece is connected with the isolating switch assembly, the lower end of the second conductive piece is provided with a conductive frame, and the conductive sliding block is located in the conductive frame and connected with the conductive frame through flexible connection.

Further, the utility model relates to a big break capacity environment-friendly gas insulated switchgear, wherein, half right of insulating cylinder is circular columnar structure, half left of insulating cylinder is square columnar structure, and half left of insulating cylinder is equipped with the louvre of upper and lower fretwork.

Further, the utility model relates to a big break capacity environment-friendly gas insulated switchgear, wherein, the both sides respectively set up one, every along controlling the direction around the conductive frame both sides the flexible coupling the one end and the electrically conductive slider of flexible coupling are connected, and the other end of flexible coupling is connected with the conductive frame through turning over the back, the downside of conductive frame is the heat radiation structure of many curved surfaces.

Further, the utility model relates to a big break capacity environment-friendly gas insulated switchgear, wherein, the isolator subassembly includes support uide bushing, insulated lead screw, action sliding sleeve, ground connection support cover and the high-pressure cover of supporting of coaxial setting, ground connection supports the cover and installs on the baffle of mechanism room and switch room, the high-pressure supports the cover and organizes with main bus bar bushing through the copper bar, it is located ground connection support cover and high-pressure and supports between the cover to support the uide bushing, supports the lower half and the electrically conductive piece of second of uide bushing and is connected, ground connection support cover and isolator mechanism's output shaft is passed to insulated lead screw's one end, and insulated lead screw's the other end is located supports the uide bushing, the action sliding sleeve adorns soon on insulated lead screw and slides in the first half of support uide bushing.

Further, the utility model relates to a big disconnected capacity environment-friendly gas insulated switchgear, wherein, support the uide bushing for "T" font and the first structure of biasing to the right side, be equipped with a constant head tank along the axis on the periphery wall of action sliding sleeve, support the uide bushing about the first both ends be equipped with a locating hole respectively, be equipped with in the locating hole with the locating pin that the constant head tank matches, it touches the finger to be equipped with a watchband in the left end of support uide bushing, is equipped with two watchbands in the right-hand member of support uide bushing, it touches the finger to be equipped with a watchband in the ground connection support cover, it touches the finger to be equipped with two watchbands in the high pressure support cover.

Further, the utility model relates to a big break capacity environment-friendly gas insulated switchgear, wherein, the left end of first electrically conductive piece is equipped with the copper support frame, and the copper support frame passes through the copper gang group to be connected with current transformer's incoming line terminal, be connected with the insulating support frame between copper support frame and the high pressure support cover.

Further, the utility model relates to a big break capacity environment-friendly gas insulated switchgear, wherein, current transformer has three outgoing line sleeve pipe, every through copper bar group link to each other outgoing line sleeve pipe is connected with two cables of being qualified for the next round of competitions respectively.

Further, the utility model relates to a big break capacity environment-friendly gas insulated switchgear, wherein, copper bar group comprises three copper bars that set up side by side.

Further, the utility model relates to a big break capacity environment-friendly gas insulated switchgear, wherein, be equipped with condensing equipment in the cubical switchboard.

The utility model relates to a big break capacity environment-friendly gas insulated switchgear, when in-service use, little bus-bar room provides the electric energy for the secondary control room, and the action of the indoor circuit breaker mechanism of secondary control room electric control mechanism and isolation mechanism, the electric current gets into from the main bus-bar room of cabinet body upper end, flows through behind isolation switch subassembly, circuit breaker subassembly and the current transformer in the cubical switchboard room, from the play line sleeve pipe outflow in the cable chamber of cabinet body lower extreme. Install isolator subassembly and circuit breaker subassembly jointly in the switch chamber, the safety protection level of switch chamber can reach IP67, has reduced the holistic volume of cabinet body simultaneously, has saved installation space. Meanwhile, the ventilation device is arranged to accelerate the heat dissipation of the cabinet body.

The environment-friendly gas insulated switchgear with large breaking capacity according to the present invention will be described in detail with reference to the embodiments shown in the drawings.

Drawings

Fig. 1 is a schematic structural view of the environment-friendly gas insulated switchgear with large breaking capacity of the present invention.

Fig. 2 is a schematic diagram of a sectional structure of the disconnecting switch assembly and the circuit breaker assembly according to an embodiment of the present invention.

Fig. 3 is a schematic view of a connection structure of the second conductive member, the conductive slider, the flexible connection and the conductive frame according to an embodiment of the present invention.

Detailed Description

It should be noted that, in the present invention, the terms of upper, lower, front, rear, left, right, and the like are only described according to the accompanying drawings, so as to facilitate understanding, and are not intended to limit the technical solution and the scope of the present invention.

As shown in fig. 1 and fig. 2, the specific embodiment of the environment-friendly gas insulated switchgear with large breaking capacity of the present invention includes a cabinet body, which is divided into a small bus chamber 1, a secondary control chamber 2, a mechanism chamber 3, a cable chamber 4, a main bus chamber 5 and a switch chamber 6. The small bus chamber 1, the secondary control chamber 2, the mechanism chamber 3 and the cable chamber 4 are distributed on the left side of the cabinet body from top to bottom, and the main bus chamber 5 and the switch chamber 6 are distributed on the right side of the cabinet body from top to bottom. An outlet sleeve 41 and a ventilation device 42 (which can be a self-cooling fan and can accelerate air circulation and take away a large amount of heat) are arranged in the cable chamber 4; a breaker mechanism 31 and an isolation mechanism 32 are installed in the mechanism chamber 3; a current transformer 61, a breaker assembly 62 and a disconnecting switch assembly 63 are installed in the switch chamber 6, the breaker mechanism 31 operates the breaker assembly 62 to act, and the disconnecting switch assembly 63 operates the disconnecting switch mechanism 32 to act; a main bus bar bushing 51 is installed in the main bus bar compartment 5. The main bus bushing 51, the disconnecting switch assembly 63, the circuit breaker assembly 62, the current transformer 61 and the outgoing bushing 41 are connected in sequence through the copper bar group 7.

The environment-friendly gas insulated switch cabinet with large switching-off capacity, compact structure, small volume, high safety performance and good heat dissipation effect is formed through the arrangement. In actual use, the small bus chamber 1 provides electric energy for the secondary control chamber 2, the breaker mechanism 31 and the isolation mechanism 32 in the electric control mechanism chamber 6 of the secondary control chamber 2 act, current enters from the main bus chamber 5 at the upper end of the cabinet body, flows through the isolation switch assembly 63, the breaker assembly 62 and the current transformer 61 in the switch chamber 6, and then flows out from the outlet sleeve 41 in the cable chamber 4 at the lower end of the cabinet body. Install isolator subassembly 63 and circuit breaker subassembly 62 jointly in switch room 6, the safety protection level of switch room 6 can reach IP67, has reduced the holistic volume of cabinet body simultaneously, has saved installation space. Meanwhile, the ventilation device 42 is arranged to accelerate the heat dissipation of the cabinet body.

As an optimized solution, as shown in fig. 1 and in combination with fig. 2, in this embodiment, the circuit breaker assembly 62 is composed of an insulating cylinder 621, a vacuum interrupter 622, a first conductive member 623, an insulating pull rod 624, a conductive slider 625, a bellows 626, and a second conductive member 627. Wherein, the left end of the insulating cylinder 621 is connected with the supporting plate 64 welded on the partition plate between the mechanism chamber 3 and the switch chamber 6, and the vacuum arc-extinguishing chamber 622 is fixedly sealed in the right half of the insulating cylinder 621. One end of the first conductive member 623 is connected to the right end of the vacuum interrupter 622 (i.e., the dead end of the vacuum interrupter), and the other end of the first conductive member 623 is connected to the incoming terminal of the current transformer 61 (i.e., the output terminal of the current transformer) through the copper bar group 7. An insulating pull rod 624 is disposed in the left half of the insulating cylinder 621 and connected to the left end of the vacuum interrupter 622 (i.e., the moving end of the vacuum interrupter). The conductive sliding block 625 is sleeved at the right end of the insulating pull rod 624 and moves along with the insulating pull rod 624. One end of the bellows 626 is connected to the left end of the insulating pull rod 624, the other end of the bellows 626 is connected to the output shaft of the breaker mechanism 31, and the bellows 624 drives the insulating pull rod 624 to move. The second conductive member 627 is embedded in the middle of the upper side of the insulating cylinder 621, the upper end of the second conductive member 627 is connected to the isolating switch assembly 63, and the lower end of the second conductive member 627 is provided with a conductive frame 628. The conductive frame 628 is fixed, and the conductive slider 625 is located in the conductive frame 628 and connected to the conductive frame 628 through a flexible connection 629, so that the conductive slider 625 can also be freely operated under the condition that the conductive frame 628 is not moved.

The main loop can be switched on and off through the arrangement, and the action principle is as follows: when the circuit breaker mechanism 31 acts, the bellows 626 is driven to act, and the bellows 626 drives the insulating pull rod 624 to act through compression or extension, so that the vacuum arc-extinguishing chamber 622 is driven to realize opening and closing actions of the main circuit, and the main circuit is opened and closed.

Based on the above embodiment, as an optimized scheme, as shown in fig. 1 and fig. 2 and with reference to fig. 3, in the present embodiment, the right half of the insulating cylinder 621 is designed to be a circular cylindrical structure, the left half of the insulating cylinder 621 is designed to be a square cylindrical structure, and the left half of the insulating cylinder 621 is provided with a heat dissipation hole 620 that is hollowed out vertically. The flexible connections 629 are respectively arranged on the front side and the rear side of the conductive frame 628 in the left-right direction, one end of each flexible connection 629 is connected with the conductive slider 625, the other end of each flexible connection 629 is connected with the conductive frame 628 after being turned over, and the lower side of the conductive frame 628 is of a multi-curved-surface heat dissipation structure. In this embodiment, the heat dissipation holes 620 are disposed on the left half portion of the insulating cylinder 621, so as to accelerate the heat dissipation speed of each component inside the insulating cylinder 621. The lower side of the conductive frame 628 is designed to be a multi-curved surface structure for heat dissipation, so that effective heat dissipation can be realized through the above arrangement, and the change of electrical performance of each component due to overhigh temperature can be prevented.

Based on the above-mentioned embodiment, as an optimized solution, as shown in fig. 1 and in conjunction with fig. 2, the isolation switch assembly 63 in this embodiment is composed of a coaxially disposed support guide sleeve 631, an insulation lead screw 632, an action sliding sleeve 633, a ground support sleeve 634, and a high voltage support sleeve 635. Wherein, the ground supporting sleeve 634 is installed on the partition board of the mechanism chamber 3 and the switch chamber 6, and when the ground supporting sleeve 634 is installed, the end of the ground supporting sleeve 634 connected with the partition board can be designed into a flange type and then fixed. The high voltage support sleeve 635 is connected to the main bus bar sleeve 51 by a copper gang 7. The support guide sleeve 631 is positioned between the ground support sleeve 634 and the high voltage support sleeve 635, and the lower half of the support guide sleeve 631 is connected to the second conductive member 627. One end of the insulated screw rod 632 passes through the grounding support sleeve 634 to be connected with the output shaft of the isolation mechanism 32, the other end of the insulated screw rod 632 is positioned in the support guide sleeve 631, and the action sliding sleeve 633 is screwed on the insulated screw rod 632 and slides in the upper half part of the support guide sleeve 631. Through the setting, isolator subassembly 63 has just combined together with breaker subassembly 62 organic, and its connection structure is compact, has realized that breaker and isolator's cabinet setting altogether has also saved installation space when reducing cabinet body volume, and isolator subassembly 63 is the cylinder type, can be so that the internal electric field of cabinet is more even, can effectively prevent the emergence of tip effect and edge effect.

In this embodiment, a three-position operation of the disconnecting switch can be realized, and the action principle is as follows: the insulation screw 632 is driven by the isolation mechanism 32 to rotate, so that the action sliding sleeve 633 can move left and right along the axis direction of the insulation screw 632. When the left end of the action sliding sleeve 633 moves into the grounding support sleeve 634, the grounding operation is realized; when the right end of the action sliding sleeve 633 moves into the high-voltage support sleeve 635, the closing operation is realized; when both ends of the actuating sliding sleeve 633 are not in contact with the ground supporting sleeve 634 and the high voltage supporting sleeve 635, an isolation operation is achieved.

As shown in fig. 1 and 2, in the present embodiment, the support guide sleeve 631 is preferably configured in a "T" shape with the upper half thereof being offset to the right because the right end of the support guide sleeve 631 is a high-pressure end and is subjected to a high strength. In order to prevent the action sliding sleeve 633 from rotating, a positioning groove 636 is arranged on the outer peripheral wall of the action sliding sleeve 633 along the axis, positioning holes 637 are respectively arranged at the left end and the right end of the upper half of the support guide sleeve 631, and positioning pins matched with the positioning grooves 636 are arranged in the positioning holes 637, so that the positioning pins can prevent the action sliding sleeve 633 from rotating, and the action process of the action sliding sleeve 633 can be smoother. In order to ensure that the actuating slide 633 has good contact with the components during the three-position operation, a strap contact finger 638 is provided in the left end of the support guide 631, two strap contact fingers 638 are provided in the right end of the support guide 631, a strap contact finger 638 is provided in the ground support 634, and two strap contact fingers 638 are provided in the high-pressure support 635.

As an optimized solution, as shown in fig. 1 and fig. 2, in this embodiment, a copper support frame 8 is disposed at the left end of the first conductive member 623, the copper support frame 8 is connected to an incoming line terminal of the current transformer 61 through a copper row group 7, and an insulating support frame 9 is connected between the copper support frame 8 and the high-voltage support sleeve 635. The insulating support frame 9 is a square hollow structure and is used for connecting the copper support frame 8 and the high-voltage support sleeve 635, the height of the insulating support frame 9 is set according to the requirement of an electrical distance, and conductive parts in the disconnecting switch assembly 63 and the circuit breaker assembly 62 can be blocked when the action sliding sleeve 633 is at an isolating position and a grounding position.

It should be noted that, on the basis of the above embodiment, in order to reduce the current of a single outgoing cable, the current transformer 61 is connected to three outgoing bushings 41 through the copper bar group 7, and each outgoing bushing 41 is connected to two outgoing cables 411 respectively. In order to accelerate the heat dissipation, the copper bar group 7 may be composed of three copper bars arranged side by side, and a condensing device 65 is arranged in the switch chamber 6. To accommodate customer needs, the voltage transformer 10 may be installed in the cable room 4, and the voltage transformer 10 may preferably be a voltage transformer of model JSZW 12A.

The above embodiments are merely descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and various modifications made by the skilled in the art according to the technical solutions of the present invention should fall within the scope of the invention as defined by the appended claims without departing from the spirit of the present invention.

Claims

1. The utility model provides a big break capacity environment-friendly gas insulated switchgear, its characterized in that, includes the cabinet body, the cabinet body is divided into little bus-bar room (1), secondary control room (2), mechanism room (3), cable chamber (4), main bus-bar room (5) and switch room (6), little bus-bar room (1), secondary control room (2), mechanism room (3) and cable chamber (4) distribute on the left side of the cabinet body according to from last order extremely down, main bus-bar room (5) and switch room (6) distribute on the right side of the cabinet body according to from last order extremely down, install outlet sleeve pipe (41) and ventilation unit (42) in cable chamber (4), install circuit breaker mechanism (31) and isolator mechanism (32) in mechanism room (3), install current transformer (61), circuit breaker subassembly (62) and isolator subassembly (63) in switch room (6), breaker mechanism (31) operation circuit breaker subassembly (62) action, isolator mechanism (32) operation isolator subassembly (63) action, install main bus bar sleeve pipe (51) in main bus-bar room (5), main bus bar sleeve pipe (51), isolator subassembly (63), breaker subassembly (62), current transformer (61) and outlet sleeve pipe (41) are organized through the copper and are connected gradually (7).

2. The large-breaking-capacity environmentally-friendly gas insulated switchgear according to claim 1, wherein the circuit breaker assembly (62) comprises an insulating cylinder (621), a vacuum interrupter (622), a first conductive member (623), an insulating pull rod (624), a conductive slider (625), a bellows (626), and a second conductive member (627), the left end of the insulating cylinder (621) is connected to a support plate (64) welded to a partition between the mechanism chamber (3) and the switching chamber (6), the vacuum interrupter (622) is fixedly sealed in the right half of the insulating cylinder (621), one end of the first conductive member (623) is connected to the right end of the vacuum interrupter (622), the other end of the first conductive member (623) is connected to an incoming terminal of the current transformer (61) through a copper bar group (7), the insulating pull rod (624) is disposed in the left half of the insulating cylinder (621) and connected to the left end of the vacuum interrupter (622), the right-hand member at insulating pull rod (624) is established to electrically conductive slider (625), the one end of bellows (626) is connected with the left end of insulating pull rod (624), the other end of bellows (626) and the output shaft of circuit breaker mechanism (31), the upside middle part at insulating cylinder (621) is embedded in second electrically conductive piece (627), and the upper end and the isolator subassembly (63) of second electrically conductive piece (627) are connected, and the lower extreme of second electrically conductive piece (627) is equipped with electrically conductive frame (628), electrically conductive slider (625) are located electrically conductive frame (628) and are connected with electrically conductive frame (628) through flexible coupling (629).

3. The environment-friendly gas insulated switchgear with large open-close capacity as claimed in claim 2, wherein the right half of the insulation cylinder (621) is a circular column structure, the left half of the insulation cylinder (621) is a square column structure, and the left half of the insulation cylinder (621) is provided with heat dissipation holes (620) which are hollowed out up and down.

4. The environment-friendly gas insulated switchgear with large open-close capacity according to claim 2, wherein the flexible connections (629) are respectively arranged on the front side and the rear side of the conductive frame (628) along the left-right direction, one end of each flexible connection (629) is connected with the conductive slider (625), the other end of each flexible connection (629) is connected with the conductive frame (628) after being folded, and the lower side of the conductive frame (628) is of a multi-curved-surface structure.

5. The large-break-capacity environmentally-friendly gas insulated switchgear according to claim 2, wherein the disconnecting switch assembly (63) comprises a coaxially arranged supporting guide sleeve (631), an insulating lead screw (632), an actuating sliding sleeve (633), a grounding support sleeve (634) and a high-voltage support sleeve (635), the grounding support sleeve (634) is installed on a partition of the mechanism chamber (3) and the switch chamber (6), the high-voltage support sleeve (635) is connected with the main bus bar sleeve (51) through a copper bar group (7), the supporting guide sleeve (631) is located between the grounding support sleeve (634) and the high-voltage support sleeve (635), the lower half part of the supporting guide sleeve (631) is connected with the second conductive member (627), one end of the insulating lead screw (632) passes through the grounding support sleeve (634) to be connected with the output shaft of the disconnecting mechanism (32), and the other end of the insulating lead screw (632) is located in the supporting guide sleeve (631), the action sliding sleeve (633) is screwed on the insulating screw rod (632) and slides in the upper half part of the support guide sleeve (631).

6. The environment-friendly gas insulated switchgear with large breaking capacity as claimed in claim 5, wherein the supporting guide sleeve (631) is "T" shaped and has a structure with the upper half biased to the right, a positioning groove (636) is formed on the outer peripheral wall of the actuating sliding sleeve (633) along the axis, positioning holes (637) are respectively formed at the left and right ends of the upper half of the supporting guide sleeve (631), positioning pins matched with the positioning grooves (636) are arranged in the positioning holes (637), a watchband contact finger (638) is arranged in the left end of the supporting guide sleeve (631), two watchband contact fingers (638) are arranged in the right end of the supporting guide sleeve (631), a watchband contact finger (638) is arranged in the grounding supporting sleeve (634), and two watchband contact fingers (638) are arranged in the high-voltage supporting sleeve (635).

7. The environment-friendly gas insulated switchgear with large switching capacity according to claim 6, wherein a copper support frame (8) is disposed at the left end of the first conductive member (623), the copper support frame (8) is connected to the incoming line terminal of the current transformer (61) through a copper bar group (7), and an insulating support frame (9) is connected between the copper support frame (8) and the high voltage support sleeve (635).

8. The environment-friendly gas insulated switchgear with large breaking capacity as claimed in claim 1, wherein the current transformer (61) is connected with three outgoing line bushings (41) through a copper bar group (7), and each outgoing line bushing (41) is connected with two outgoing line cables (411) respectively.

9. An environment-friendly gas insulated switchgear with large breaking capacity as claimed in any of claims 1-8, characterized in that said copper row group (7) consists of three copper rows arranged side by side.

10. An environment-friendly gas insulated switchgear with large switching capacity as claimed in any of claims 1-8, characterized in that said switchgear cabinet (6) is provided with a condensing device (65).