CN2796202Y - Gas insulation metal sealed closed switch device - Google Patents

Abstract

The utility model relates to a gas-insulated metal-enclosed switchgear, which is characterized in that the circuit breaker of each gas-insulated metal-enclosed switch is vertically connected to the bottom frame, and one end of two current transformers is respectively arranged at the upper and lower outlet terminals of the circuit breaker , the other end of the current transformer on the upper side is connected to two bus isolating switches, the lower ends of the two bus isolating switches are respectively connected to the grounding switch on both sides, and the other end of the bus isolating switch is connected to the connecting bus, and the end of the connecting bus is connected to the vertical voltage Transformer, the lower end of the voltage transformer is equipped with a cable terminal connection box, the other end of the current transformer at the outlet end of the circuit breaker is connected to two busbar isolating switches, and the other end of the outer busbar isolating switch is connected to a grounding switch, and the two busbars are isolated The lower ends of the switches are vertically connected with the main bus bars respectively. The utility model has the advantages of small occupied area, low construction cost of the power station, simple structure and reduced operation work.

Description

A gas-insulated metal-enclosed switchgear

technical field

The utility model relates to a gas-insulated metal-enclosed switchgear, which is a key device in a high-voltage power transmission and transformation system and is used for line measurement, control, protection and maintenance and peak regulation of the power system, and belongs to the high-voltage switchgear

technology field.

Background technique

Conventional gas-insulated metal-enclosed switchgear mainly consists of circuit breakers, disconnectors, grounding switches, current transformers, voltage transformers, lightning arresters, busbars, and outgoing line components. They are independent components that are connected through standard parts. Together, its disadvantages are:

——The arc extinguishing unit of the circuit breaker adopts a compressed air structure, which must be equipped with a large operating power to complete the action;

——The action of the circuit breaker is completed by a pneumatic device, and the action of this device must be equipped with a compressed air station as a power source and the air source is sent to this pneumatic device by laying a certain length of pipeline, The laying of the pipeline is easy to cause compressed air leakage, which makes the pneumatic device unable to reach the pressure value of the action. In addition, the placement of the compressed air station causes the equipment to occupy a large area and the equipment cost is high;

——The overall size of the isolating switch is large and the versatility is poor;

——The structure of the sealed shaft is complex;

- The voltage transformer and the cable terminal box are not combined together;

——The structure of the busbar is large in size and occupies a large area;

——The large-capacity bus connection structure is complex.

Contents of the invention

The purpose of the utility model is to invent a gas-insulated metal-enclosed switchgear with small floor space, low power station construction cost, simple structure, reduced operating power, and improved generalization and compounding of equipment.

In order to achieve the above objectives, the technical solution of the utility model is to provide a gas-insulated metal-enclosed switchgear, which is characterized in that it consists of three-pole gas-insulated metal-enclosed switches parallel to each other, and each gas-insulated metal-enclosed switch is composed of a circuit breaker , chassis, current transformer, bus disconnector, bracket, main bus,

It consists of grounding switch, two busbar isolating switches, connecting busbars, voltage transformers and cable terminal connection boxes. It is vertically installed at the upper and lower outlet ends of the circuit breaker. The other end of the upper outlet current transformer is connected to two bus disconnectors with outlet function. A grounding switch is installed on both sides of the lower ends of the two bus disconnectors. The other end of the bus isolating switch is connected to the connecting bus, and the end of the connecting bus is vertically connected to the voltage transformer. The cable terminal connection box leads out high-voltage cables, the adjustable cable terminal connection box is fixed on the bracket, the voltage transformer, the cable terminal connection box and the bracket are arranged on the same center line, and the current mutual inductance of the outlet terminal on the lower side of the circuit breaker The other end of the transformer is connected to two bus isolating switches connected together, the current transformer at the outlet end of the lower side and the two connected bus isolating switches are set on the same center line, and the other end of the outer bus isolating switch is connected to the grounding switch , the lower ends of the two busbar isolating switches are vertically connected with two parallel main busbars, and the adjustable main busbars are fixed on the bracket.

The utility model changes the compressed air arc extinguishing structure of the circuit breaker into a self-energy arc extinguishing structure, reduces the operating work, changes the pneumatic device into a spring operating device, cancels the air source equipment, and makes the equipment layout more compact. The area of the power station is greatly reduced, which reduces the capital investment in the construction of the power station, and at the same time reduces the overall size of the disconnector, enhances the versatility of the structure, simplifies the structure of the sealing shaft, makes the equipment simpler and more reliable, and facilitates the manufacture of products. The combination of cable terminal boxes simplifies the bus connection structure, reduces the overall size and makes the equipment more compact.

The utility model has the advantages of small occupied area, low construction cost of the power station, simple structure, reduced operation work, and improved generalization and compounding of equipment.

Description of drawings

Figure 1 is a schematic diagram of the appearance and structure of a gas-insulated metal-enclosed switchgear;

Fig. 2 is a top view of a gas-insulated metal-enclosed switchgear;

Fig. 3 is a schematic structural diagram of a one-pole gas-insulated metal-enclosed switch;

Figure 4 is a schematic diagram of the structure of the circuit breaker;

Fig. 5 is a structural schematic diagram of a current transformer;

Fig. 6 is a schematic diagram of the switch structure of the bus isolating switch 6a;

Fig. 7 is a schematic diagram of the H-direction structure of the bus isolating switch 6a;

Fig. 8 is a structural schematic diagram of a grounding switch;

Fig. 9 is a schematic diagram of the switch structure of the bus isolating switch 6b;

Figure 10 is a schematic diagram of the structure of the main busbar;

Figure 11 is a schematic diagram of the connection busbar structure;

Fig. 12 is a schematic structural diagram of the cable terminal connection box 14;

Fig. 13 is a schematic diagram of the appearance and structure of the gas-insulated metal-enclosed switchgear in Embodiment 2;

Fig. 14 is a schematic diagram of the appearance and structure of the gas-insulated metal-enclosed switchgear in Embodiment 3;

Fig. 15 is a schematic diagram of the appearance and structure of the gas-insulated metal-enclosed switchgear in Embodiment 4.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Example 1

As shown in Figures 1, 2, and 3, it is a schematic structural diagram of a gas-insulated metal-enclosed switchgear, which is composed of gas-insulated metal-enclosed switches 1 with three poles arranged in parallel with each other, and each gas-insulated metal-enclosed switch 1 is composed of an open circuit Device 2, chassis 3, current transformer 4, bus disconnector 6a, 6b, bracket 7, main busbar 8a, 8b, grounding switch 9, two busbar disconnectors 11, connecting busbar 12, voltage transformer 13, cable terminal The connection box 14 is composed of a base frame 3 made of metal profiles installed on the foundation 10. The rotatable circuit breaker 2 is vertically connected with the base frame 3. This connection is an adjustable connection. Two parallel current transformers 4 One end is vertically installed on the upper and lower outlet ends of the circuit breaker 2, the other end of the upper outlet current transformer 4 is connected to two bus disconnectors 11 with outlet function, and the lower ends of the two bus disconnectors 11 are respectively installed on both sides. A grounding switch 9 is connected to the connecting bus 12 at the other end of the bus isolating switch 11, and the end of the connecting bus 12 is vertically connected to the voltage transformer 13, and the upper outgoing current transformer 4, the bus isolating switch 11 and the connecting bus 12 are arranged in the same center On the line, the lower end of the voltage transformer 13 is provided with a cable terminal connection box 14. The cable terminal connection box 14 leads to a high-voltage cable 15, and the adjustable cable terminal connection box 14 is fixed on the bracket 16. This kind of fixing is an adjustable fixed , the voltage transformer 13, the cable terminal connection box 14 and the support 16 are located on the same center line, and the other end of the current transformer 4 at the outlet end of the circuit breaker 2 is connected to two bus disconnectors 6a, 6b, the current transformer 4 at the outlet end of the lower side and the two bus isolating switches 6a and 6b connected together are set on the same center line, and the other end of the outer bus isolating switch 6a is connected to the grounding switch 9, and the two bus isolating switches 6a The lower ends of , 6b are respectively vertically connected with two parallel main busbars 8a, 8b, and the adjustable main busbars 8a, 8b are fixed on the bracket 7.

The upper outlet of each pole of the circuit breaker 2 can usually rotate 90° or 180° around the pole axis. Since each pole of the circuit breaker 2 has an independent drive device, each pole can have outlets in different directions.

As shown in Figure 4, it is a schematic structural diagram of the circuit breaker 2. The static contact 20 at the center upper end of the housing 17 of the circuit breaker 2 is connected to the cover plate 22 through a fixed insulator 21, and an explosion-proof sheet 23 is installed on the cover plate 22. The contact 20 is connected to the sliding conductor 28 of the current transformer 4 through the contact device 24 vertically installed on the right side, and the moving contact device 25 is installed at the lower end of the static contact 20, and the moving contact device 25 is connected to the bottom of the housing 17 through the fixed insulator 26 The fixed contact 20 and the moving contact device 25 are respectively connected to the sliding conductor 28 of the current transformer 4 through the contact device 24 vertically installed on the right side. The upper end of rod 18 is provided with movable contact 19, and the lower end of insulating operating rod 18 is connected driving device 5, and driving device 5 is installed in the lower end of shell 17, and shell 17, static contact 20, moving contact device 25 and driving device 5 are provided with On the same central line, the shell 17 gaps are filled with SF ₆ gas.

The contact device 25 transmits the current and voltage to the lower part of the circuit breaker 2 through the contact device 24, and connects the working current when the circuit breaker is closed, and the driving device 5 transmits the force to the insulating operating rod 18 through force conversion, The insulating operating rod 18 pushes the movable contact 19 in the movable contact device 25 to move upward, and the upper part of the arc extinguishing unit fixed on the cover plate 24 is hung into the casing from above during installation.

As shown in Figure 5, it is a schematic diagram of the structure of a current transformer. The current transformer 4 includes an airtight metal shell 29 and a primary conductor 28, a secondary coil 30, and a shielding cylinder 36 installed inside it. The shielding cylinder 36 is fixed in the casing 29, and 1 to 5 secondary coils 30 can be placed on the shielding cylinder 36. In order to prevent the secondary coil 30 from being displaced due to vibration when installed on the shielding cylinder 36, the The upper part of 30 is fixed with a set of metal clamps 31 fixed on the shielding cylinder 36, and a primary conductor 28 is passed through the center of the shielding cylinder 36. One end of the primary conductor 28 is connected to the circuit breaker 2, and the other end is passed through the contact assembly. 37, 38, 39, 40 are connected to the connecting bus bar 12. When the current transformer 4 is working, when the current passes through the high-potential primary conductor 28, a low-potential secondary current is induced in the secondary coil 30, and is drawn out through the current. The wire 32 is drawn out, and the current lead-out wire 32 is fixed on the connecting wire 34 of an insulator 33 to lead the current signal to the outside, and the insulator 99 is airtightly connected with the metal shell 29 by bolts. And the outside is covered with a metal cover 35.

As shown in Figures 6 and 7, it is a schematic diagram of the structure of the bus disconnector. The insulator 56 through which the conductor 57 on the left side of the housing 43 of the bus disconnector 6a passes through the flange 58 and the cover plate 59 and the hole 41 of the housing 43 Air-tight connection with bolts, another flange 60 for fixing the cover plate 59 is installed on the outside of the cover plate 59, and connected vertically with the insulating pull rod 61, the insulating pull rod 61 passes through the shielding cover 55 to connect the driving device 62, the shielding cover 55 Install the moving contact 49 that can move vertically, the conductor 47 is fixed on the conductor 42, the conductor 42 is connected with the current connection conductor 57, a movable contact 48 is installed on the conductor 47, and the moving contact 49 is connected by the conductor 47, so that The current flows from the conductor 47 of the isolating switch to the movable contact 49. The movable contact 49 and the movable contact 48 are all on the same axis. The upper end of the contact seat 50 is installed, and the conductor 47 and the outer surface of the contact seat 50 should be smoothly transitioned to facilitate the distribution of the electric field. The end of the contact seat 50 near the shielding cover 55 is installed with a static contact 52 that matches the moving contact 48. , there is a disconnection distance between the shielding cover 55 and the static contact 52 with an electric boundary effect, when the isolating switch 6a is opened, there is a certain disconnection distance between the shielding cover 55 and the static contact 52, which can withstand The right side of the casing 43 is connected to the grounding switch 9 through the flange 46, the upper end of the casing 43 is connected to the end cover 45 through the flange 44, and the current connecting conductors 57, 51 It is at high potential during operation and is insulated from the metal case of the product.

When the isolating switch 6a is turned on, the insulating pull rod 61 operated by the isolating switch driving device 62 makes the movable contact 48 move along the vertical axis to contact with the static contact 52, because between the shielding cover 55 and the static contact 52 The power frequency voltage of the isolating switch produces a voltage pre-breakdown during the connection process of the isolating switch. Through the geometric structure of the shielding cover 55 and the static contact 52, the dynamic force caused by the power frequency voltage between the shielding cover 55 and the static contact 52 can be reduced. The voltage pre-breakdown arc between the contact 49 and the static contact 52 is fully controlled and will not spread to the shell 43. The disconnector drive device 62 is designed to reliably move the movable contact 49 to the predetermined contact under any circumstances. This ensures that the contacts under the rated current are reliably energized, and there is no problem with the isolating switch being disconnected.

As shown in Figure 8, it is a schematic diagram of the structure of the grounding switch. The housing 66 of the grounding switch 9 is provided with a concentrically arranged contact seat 67, and the inner wall of the contact seat 67 is provided with connecting contact fingers 64 and two garden rings. 68, the moving contact 69 is installed in the center of the contact seat 67, one end is connected with the contact device 62 with the shield 63, and the end of the grounding switch housing 66 is provided with an explosion-proof sheet 65.

As shown in Figure 9, it is a schematic diagram of the structure of the disconnector 6b. The structure of the disconnector 6b is exactly the same as that of the disconnector 6a, except that the grounding switch 9 is not installed, and the current-carrying conductor 70 is connected to the disconnector 6a through the connecting conductor 57 instead. A grounding switch 9 in common can be reliably grounded.

The isolating switch 6a, 6b can be installed at any position of the product, and the grounding switch 9 can also be installed at any position, so it is not limited by the installation position. The grounding switch 9 can be used as a grounding switch or as a fault closing grounding switch In use, the isolating switches 6a, 6b connected to the earthing switch 9 are compact in structure and occupy a small enough space in the direction of the axis, so that the entire product can be made into a smaller size.

The contact movement of the isolating switch 6a, 6b is controlled by an electric or spring drive device arranged outside the isolating switch housing, but the isolating switch 6a, 6b can also be driven manually, and the contact movement of the earthing switch 9 is also controlled by an electric or spring drive device arranged on the grounding switch. Electric or spring drives outside the switch housing and the drives for the disconnectors 6a, 6b and the earthing switch 9 are arranged at the same level for easy access. The isolating switch and the grounding switch are equipped with mechanically connected position indicators and locking devices, which have the advantage of convenient operation and maintenance.

As shown in Figure 10, the schematic diagram of the main busbar structure, the main busbar 8a and the main busbar 8b have the same structure, the main busbar 8a is a three-pole common box type, and the busbar housing 71 is equipped with three insulating support members 77 , respectively connected to the three-pole current-carrying conductor 78 through the contact seat 76, the three-pole current-carrying conductor 78 is arranged in a triangle, each contact seat 76 is installed with a conductor 75 along the vertical direction, and a shielding cover is installed above the conductor 75 Connect the contact 74, the contact assembly 72 is installed in the connection contact 74, the contact assembly 72 is connected with the current connection conductor 51 with bolts, and the insulator 53 through which the current connection conductor 51 passes is connected with the flange 73, so that the external Current is introduced into the main busbars 8a, 8b.

As shown in FIG. 11 , it is a schematic diagram of the connection busbar structure. The current connection conductor 80 on the static contact side insulator 79 of the isolating switch 11 extends outwards to connect with a contact assembly 81 , and the lower end of the contact assembly 81 passes through the static contact 82 It is connected with the grounding switch 9 vertically arranged at the lower end of the isolating switch 11 , the contact assembly 81 and the contact assembly 85 are connected through the current-carrying conductor 84 with the connection ring 83 , and the contact assembly 85 is connected with the connection conductor 87 on the insulator 86 .

The connection mode between the isolating switch 11 and the earthing switch 9 is the same as that between the isolating switch 6a and the earthing switch 9, the only difference being that the moving and static contacts of the earthing switch 9 connected with the isolating switch 6a are along the horizontal axis.

As shown in Figure 12, it is a schematic diagram of the structure of the cable terminal connection box 14. The connecting conductor 89 inside the cable connection terminal box 14 is connected to the connecting conductor 87 on the insulator 86 through the connecting conductor 90, and the cable is connected above the terminal box 14. The contact base 93 fixed on the connecting conductor 89, the connecting conductor 92 and the contact assembly 91 are electrically connected to the transformer 13 for measuring voltage, and the contact assembly 94 with the plum blossom contact 95 fixed on the connecting conductor 89 is connected to the lower part. The connection conductor 96 at the end of the cable is connected. Considering the uniform distribution of the electric field, a shielding cover 97 is provided outside the contact assembly 94 and the connection conductor 96 of the cable.

When working, the utility model, as a high-voltage switch product, plays a function of power-off and power-on in the power station. When the power station needs to send power to the outside, the grounding switch 9 in the device is opened, the isolating switch 6 and the circuit breaker. Switch 2 closes, when the power station equipment needs to be overhauled or other reasons need to cut off the power supply, the isolating switch 6 and the circuit breaker 2 switch off in the equipment, and the grounding switch 9 closes.

Example 2

As shown in Figure 13, it is a schematic diagram of the appearance structure of the gas-insulated metal-enclosed switchgear in Embodiment 2. The utility model can remove the isolating switch 6b near the side of the circuit breaker 2, the bus bar 8 and the conductor 70 according to the needs, and put the grounding on the right side The switch 9 is connected to the isolating switch 6a, and the outgoing line arranged on the upper side of the circuit breaker 2 can also be arranged along the axis by 180° rotation.

Example 3

As shown in Figure 13, it is a schematic diagram of the appearance structure of the gas-insulated metal-enclosed switchgear of Embodiment 3. The utility model is only a cable entry and exit mode. When the overhead line entry and exit mode is changed, the voltage transformer 13 is canceled and replaced. The most important is the porcelain bushing 98 with the current-carrying conductor inside, the bushing axis is perpendicular to the base 10, the lower cable terminal connection box 14 and the cable 15 are also canceled, and the connecting conductor 100 is replaced by the connecting conductor 100, and the contact assembly is installed 93 are the same as the busbar 99 of the contact assembly, and the busbar housing of this section is connected to the flange of the porcelain sleeve 98 through the upper side of the bolt, and the left side is connected to the connecting busbar 12 housing flange.

Example 4

As shown in Figure 14, it is a schematic diagram of the appearance structure of the gas-insulated metal-enclosed switchgear of Embodiment 4. When the utility model changes from being connected with a cable to being connected with a transformer, the voltage transformer 13 is canceled, and a cover plate 101 is installed to seal it with bolts. The lower structure of this hole is similar to the cable connection method, except that the epoxy cone at the end of the cable is replaced with the oil-gas bushing 102 at the end of the transformer.

Claims (9)

1. Cubicle Gas-Insulated Switchgear, it is characterized in that, gas-insulated metal enclosed switchgear (1) by three extremely mutual flat rafts is formed, each gas-insulated metal enclosed switchgear (1) is by circuit breaker (2), underframe (3), current transformer (4), bus isolating switch (6a, 6b), support (7), main bus bar (8a, 8b), earthed switch (9), two bus isolating switchs (11), connection bus (12), voltage transformer (13), cable termination link box (14) is formed, underframe (3) places on the basis (10), rotatable circuit breaker (2) vertically is connected with underframe (3), two current transformer that is parallel to each other (4) one ends are vertical at two leading-out terminals up and down of circuit breaker (2) respectively, the other end of upside outlet current transformer (4) is connected with two bus isolating switchs (11) with outlet function, the both sides, lower end of two bus isolating switchs (11) are respectively equipped with an earthed switch (9), the other end at bus isolating switch (11) is connected with connection bus (12), the terminal vertical voltage transformer (13) that connects of connection bus (12), upside outlet current transformer (4), bus isolating switch (11) and connection bus (12) are located on the same center line, the lower end of voltage transformer (13) is provided with cable termination link box (14), cable termination link box (14) is drawn high-tension cable (15), adjustable cable termination link box (14) is fixed on the support (16), voltage transformer (13), cable termination link box (14) and support (16) are located on the same center line, the other end of the current transformer (4) of described circuit breaker (2) downside leading-out terminal connects two bus isolating switch (6a that connect together, 6b), bus isolating switch (the 6a that the current transformer of downside leading-out terminal (4) connects together with two, 6b) be located on the same center line, the other end of side bus isolating switch (6a) connects earthed switch (9) outside, two bus isolating switch (6a, 6b) lower end respectively with two main bus bar (8a that are parallel to each other, 8b) vertical connection, adjustable main bus bar (8a, 8b) be fixed on the support (7).

2. a kind of Cubicle Gas-Insulated Switchgear according to claim 1, it is characterized in that, the fixed contact (20) of the upper end, shell (17) center of described circuit breaker (2) is connected with cover plate (22) by fixed insulation (21), cover plate (22) is provided with blast protection sheet (23), the contact apparatus (24) that fixed contact (20) vertically is provided with by a side is connected with the sliding conductor (28) of current transformer (4), fixed contact (20) lower end is provided with trigger device (25), trigger device (25) is connected with shell (17) flange in the bottom (27) by fixed insulation (26), fixed contact (20), the contact apparatus (24) that trigger device (25) vertically is provided with by homonymy respectively is connected with the sliding conductor (28) of current transformer (4), trigger device (25) center is provided with insulating bar (18), the upper end of insulating bar (18) is provided with moving contact (19), the lower end of insulating bar (18) connects drive unit (5), drive unit (5) is located at the lower end of shell (17), shell (17), fixed contact (20), trigger device (25) and drive unit (5) are located on the same center line, and shell is provided with SF6 gas in (17).

3. a kind of Cubicle Gas-Insulated Switchgear according to claim 1, it is characterized in that, described current transformer (4) comprises a shell (29) and is contained in its inner Primary Conductor (28), secondary coil (30), shielding cylinder (36), shielding cylinder (36) is fixed in the shell (29), on shielding cylinder (36), be provided with secondary coil (30), the top of secondary coil (30) is fixing by the metal fixture (31) that is fixed on the shielding cylinder (36), shielding cylinder (36) the center be provided with Primary Conductor (28), one end of Primary Conductor (28) is connected with circuit breaker (2), the other end is by contact assembly (37,38,39,40) be connected with connection bus (12), secondary coil (30) is drawn by electric current lead-out wire (32), electric current lead-out wire (32) is fixed on by insulator (33) and connects on the lead (34), insulator (33) is connected with metal shell (29), and metal cap (35) is located at outside the insulator (33).

4. a kind of Cubicle Gas-Insulated Switchgear according to claim 3 is characterized in that, described secondary coil (30) is 1～5.

5. a kind of Cubicle Gas-Insulated Switchgear according to claim 1, it is characterized in that, the insulator (56) that housing (43) one side conductors (57) of described bus isolating switch (6a) pass is connected with the hole (41) of housing (43) with cover plate (59) by flange (58), be provided with another flange that is used for fixing cover plate (59) (60) in cover plate (59) outside, and vertically be connected with insulated tension pole (61), insulated tension pole (61) passes radome (55) and connects contact device (62), radome (55) but in be provided with the moving contact (49) of movement in vertical direction, conductor (47) is fixed on the conductor (42), conductor (42) is connected with electric current bonding conductor (57), on conductor (47), be provided with a movable contact (48), connect moving contact (49) by conductor (47), moving contact (49), movable contact (48) all is on the same axis, the insulator (53) that conductor (51) passes is connected with housing (43) lower end by flange (54), the upper end of conductor (51) is provided with contact base (50), contact base (50) is provided with a fixed contact (52) that is complementary with moving contact (48) near radome (55) one ends, be provided with break distance between radome (55) and the fixed contact (52), the opposite side of housing (43) is connected with earthed switch (9) by flange (46), and the upper end of housing (43) is connected with end cap (45) by flange (44).

6. a kind of Cubicle Gas-Insulated Switchgear according to claim 1, it is characterized in that, be provided with the contact base (67) of arranged concentric in the housing (66) of described earthed switch (9), this contact base (67) inwall is provided with and connects fingertip (64) and two garden rings (68), moving contact (69) is located at the center of contact base (67), one end is connected with the contact device that has radome (63) (62), and the end of earthed switch housing (66) is provided with blast protection sheet (65).

7. a kind of Cubicle Gas-Insulated Switchgear according to claim 1, it is characterized in that, described main bus bar (8a) is identical with main bus bar (8b) structure, described main bus bar (8a) is three boxes extremely altogether, bus housing (71) inside is provided with three insulation supporters (77), be connected with three utmost point currents (78) respectively by contact base (76), three utmost point currents (78) are triangularly arranged, each contact base (76) vertically is provided with conductor (75), be provided with a connection contact (74) that has radome in conductor (75) top, contact assembly (72) is located at and is connected in the contact (74), contact assembly (72) is electrically connected with electric current bonding conductor (51), and the insulator (53) that electric current bonding conductor (51) passes is connected with flange (73).

8. a kind of Cubicle Gas-Insulated Switchgear according to claim 1, it is characterized in that, electric current bonding conductor (80) on the fixed contact side insulator (79) of described isolating switch (11) stretches out and is connected with a contact assembly (81), contact assembly (81) lower end is connected with the earthed switch (9) that is vertical at isolating switch (11) lower end by fixed contact (82), contact assembly (81) is connected by the current (84) that has connecting ring (83) with contact assembly (85), and contact assembly (85) is connected with bonding conductor (87) on the insulator (86).

9. a kind of Cubicle Gas-Insulated Switchgear according to claim 1, it is characterized in that, inner bonding conductor (89) one sides of described cable connecting terminal case (14) are connected with bonding conductor (87) on the insulator (86) by bonding conductor (90), cable connecting terminal case (14) top is by being fixed on the contact base (93) on the bonding conductor (89), bonding conductor (92) and contact assembly (91) are electrically connected with the instrument transformer (13) of measuring voltage, the below is connected with the bonding conductor (96) of cable end piece by the contact assembly that has Mume flower contact (95) (94) that is fixed on the bonding conductor (89), is provided with radome (97) in bonding conductor (96) outside of contact assembly (94) and cable.

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