CN2817142Y - Small-sized gas-insulated metal closed switch device - Google Patents

Abstract

The utility model relates to providing a miniaturized gas-insulated metal-enclosed switchgear, which is characterized in that a centralized control cabinet is arranged on one side of two three-position switches on the side of the busbar, and is respectively connected with the three-position switch on the side of the busbar, a circuit breaker, a current transformer, The three-position switch on the line side is connected to the cable terminal. One side of the circuit breaker is connected to the two three-position switches on the busbar side through two non-ventilated basin insulators, and the other side is connected to the current transformer through bolts, and then through the non-ventilated basin The insulator is connected to the three-position switch on the line side, and the cable terminal is connected to the lower part of the three-position switch on the line side. The three-position switch on the bus side is connected, and the circuit breaker operating device is set above the circuit breaker. The utility model has the advantages of least operating elements, smaller occupied space, reliable performance and complete functions.

Description

Miniaturized gas-insulated metal-enclosed switchgear

technical field

The utility model relates to a miniaturized gas-insulated metal-enclosed switchgear, which is used in various power plants, step-up and step-down substations, etc. in a 110kV high-voltage power transmission and transformation system to play the role of control, protection and measurement, and belongs to the high-voltage switchgear technology field.

Background technique

In a 110kV power system, as shown in Figures 1 and 2, it is a schematic structural diagram of a compartment of a traditional 110kV sulfur hexafluoride gas-insulated metal-enclosed switchgear, consisting of a circuit breaker 51, a current transformer 52, a line-side isolating switch 53, and Side grounding switch 54, line side fault closing grounding switch 55, cable terminal 56, bus side isolating switch 57, bus side grounding switch 58, bus side isolating switch 59, main bus 60, main bus 61, circuit breaker operating mechanism 62, Composed of combined electrical appliances centralized control cabinet 63, the upper end of circuit breaker 51 is connected to cable terminal 56 through current transformer 52 and line side isolating switch 53, and the lower end of circuit breaker 51 is provided with bus bar side isolating switch 57, bus bar side grounding switch 58, and bus bar side isolating switch The switch 59 , the main bus 60 , the main bus 61 , and the circuit breaker operating mechanism 62 are arranged below the circuit breaker 51 .

As shown in Figure 3, it is a schematic diagram of the structure of the arc extinguishing chamber of the porcelain column circuit breaker in the circuit breaker 51. The arc extinguishing chamber of the porcelain column circuit breaker is composed of an insulating pull rod 64, a support member 65, a porcelain bottle 66, and a plum blossom contact 67. , the main static contact 68, the moving contact 69, the insulating pull rod 64 is set at the bottom center of the porcelain bottle 66, the outer side of the insulating pull rod 64 is provided with a moving contact 69, and the main static contact 68 is set on the top of the moving contact 69 , The plum blossom contact 67 is located between the main static contact 68 and the moving contact 69.

Traditional 110kV sulfur hexafluoride gas-insulated metal-enclosed switchgear has a distance of 1300mm to 1500mm for each interval. Disconnectors, grounding switches, and main busbars are all independent units, which occupy a relatively large area and have many components. The maintenance workload is also large.

Contents of the invention

The purpose of the utility model is to invent a miniaturized gas-insulated metal-enclosed switchgear with the least operating elements and a smaller occupied space while providing reliable performance and complete functions.

In order to achieve the above objectives, the technical solution of this utility model is to provide a miniaturized gas-insulated metal-enclosed switchgear, which is characterized in that it consists of a centralized control cabinet, two three-position switches on the bus side, two three-position switch operating mechanisms, and a circuit breaker. device, circuit breaker operating device, current transformer, three-position switch operating device on the line side, three-position switch on the line side and the secondary connection of the cable terminal. The three-position switch on the busbar side, the circuit breaker, the current transformer, the three-position switch on the line side and the cable terminal are connected. Connect the current transformer through bolts, and then connect with the three-position switch on the line side through the non-ventilated basin insulator. The cable terminal is connected below the three-position switch on the line side, and the three-position switch operating device on the line side is located at the three-position switch on the line side On one side, two three-position switch operating mechanisms are respectively connected to two three-position switches on the busbar side, and the circuit breaker operating device is arranged above the circuit breaker.

The circuit breaker is composed of B-phase insulating pull rod, crank arm output shaft, connecting plate, A (C) phase operating crank arm, A (C) phase insulating pull rod, three-pole main conductor, three-pole arc extinguishing chamber, circuit breaker shell , conductors, the three-pole interrupter is supported by three insulating columns and the finished product is set in the circuit breaker shell. One end of the crank arm on the output shaft is connected to the B-phase insulating pull rod, and the other end is connected to the connecting plate. The connecting plate passes through A (C ) phase operation crank arm is connected with A (C) phase insulation pull rod, the three-pole main conductor is respectively connected with the lower part of the three-pole arc extinguishing chamber, and the current transformer conductor is connected with the upper part of the arc extinguishing chamber.

The arc extinguishing chamber for each pole is composed of an insulating column, a support platform, an insulating arc extinguishing platform, a support piece, an insulating platform, an insulating pull rod, an active contact, and a main static contact. , support piece, and insulating table form the shell of the arc extinguishing chamber, the insulating pull rod, the active contact and the main static contact are set in the shell, the active contact is set on the upper end of the main static contact, the insulating pull rod is connected with the active contact, and the support The stand is connected to the three-pole main conductor in the circuit breaker, and the insulation stand is connected to the upper flange of the circuit breaker.

The utility model has the following differences from the traditional combination switch:

1. The sufficient space required for the mechanism for operating and overhauling the circuit breaker between the intervals is canceled. The operating mechanism of the circuit breaker is changed from the original bottom to the top of the circuit breaker, and the connecting mechanism is connected with the insulating pull rod of the circuit breaker to realize the linkage of the movable part of the three-pole interrupter of the circuit breaker. Only in this way, it is possible to reduce the distance of each interval of the miniaturized combined electrical appliances from the original 1500mm-1300mm to 800mm.

2. The utility model arranges the three-pole arc extinguishing chamber in the shape of "pin" in the circuit breaker shell, and at the same time arranges the three-pole busbar conductor in the shape of "pin"; cancels the porcelain bottle and the arc extinguishing chamber of the original porcelain column circuit breaker. The plum blossom contact and the porcelain bottle are replaced by insulating columns, supporting parts, arc extinguishing insulating tables, supporting parts and upper insulating tables. The diameter of the arc extinguishing chamber is reduced to meet the requirements of three-pole arc extinguishing chambers being installed in the same cylinder. At the same time, the utility model reverses the dynamic and static parts of the arc extinguishing chamber of the porcelain column circuit breaker upside down, that is, the moving contact The opening is changed from downward movement to upward movement, and the insulating rod also moves upward.

The utility model cancels the main static contact and the supporting part in the arc extinguishing chamber of the porcelain column circuit breaker and replaces them with the supporting part and the main static contact, thereby reducing the number of parts and improving product reliability. Among them, the support is used to connect with the current transformer,

All the changes make the operating power of the circuit breaker arc extinguishing chamber only one-third of that of the compressed air arc extinguishing principle, and at the same time improve the breaking capacity of the circuit breaker, so the structure is light and handy, maintenance-free or less maintenance, making the utility model The failure rate is only 1/7 of the hydraulic mechanism and 1/14 of the pneumatic mechanism.

3. The utility model adopts a three-position switch on the busbar side and a three-position switch on the line side, which combines the original independent isolation switch 59, grounding switch 58, and main busbar 61 into one three-position switch on the busbar side; On the line side, the original independent isolating switch 53, grounding switch 54, and fault grounding switch 55 are combined into one as a three-position switch on the line side, which reduces the number of components and the number of component mechanisms accordingly; in addition, it is different from the traditional Compared with the control mechanism of the isolating switch, grounding switch and fault grounding switch on the side, the control mechanism of the three-position switch is on the front, so the distance between them can be reduced to 800mm, which further reduces the occupied area.

4. The utility model assembles the three-position switches in groups, that is, the combined switches are connected one by one at the basin insulators of the interface, forming the connection of conductors, thereby forming the main bus bar of the miniaturized switch, that is, canceling The original independent main bus element.

5. The utility model arranges the three-position switch on the outside of the circuit breaker, and the operating mechanism of the three-position switch is also changed from the space between the intervals to the outside of the interval. The purpose of this arrangement is to reduce the interval The space between and the interval makes it possible to reduce the interval distance of each combined electrical appliance from 1500mm-1300mm to 800mm.

6. The utility model arranges the three-position switch on the outside of the circuit breaker

The utility model has the advantages of:

1. This utility model uses SF ₆ gas as the insulation and arc extinguishing medium. Due to the self-energy arc extinguishing principle, it is equipped with a spring operating mechanism with a light structure. It has strong breaking capacity, small operating power, long mechanical life and reliability. High performance, also has the advantages of maintenance-free or less maintenance;

2. The utility model adopts the spring operating mechanism, so there is no air leakage of the pneumatic mechanism, large noise and oil leakage of the hydraulic mechanism; and there is no corresponding sealing requirement, so the manufacturability is good and the price is low;

3. The utility model adopts a three-position switch, which reduces the number of components, so the structure is simpler and more compact, and the production cost is reduced. The volume occupied is only 50% to 60% of the traditional gas-insulated metal-enclosed switchgear, and the applicability is wider. ;

4. Each element of the utility model is an independent closed unit, which can be combined into various units according to needs, so it has good versatility and can meet the different operation requirements of all power stations.

Description of drawings

Figure 1 is a schematic structural diagram of a traditional 110kV sulfur hexafluoride gas-insulated metal-enclosed switchgear;

Figure 2 is a top view of a traditional 110kV sulfur hexafluoride gas-insulated metal-enclosed switchgear;

Figure 3 is a schematic diagram of the structure of the arc extinguishing chamber of the porcelain column circuit breaker;

Fig. 4 is a schematic structural diagram of a miniaturized gas-insulated metal-enclosed switchgear;

Fig. 5 is a top view of a miniaturized gas-insulated metal-enclosed switchgear;

Figure 6 is a schematic structural diagram of a three-position switch on the bus side;

Figure 7 is a top view of the three-position switch on the bus side;

Figure 8 is a schematic structural diagram of the circuit breaker;

Figure 9 is a top view of the circuit breaker;

Figure 10 is a schematic diagram of the structure of the arc extinguishing chamber of the miniaturized combined electrical circuit breaker;

Fig. 11 is a structural schematic diagram of a three-position switch on the line side.

Detailed ways

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

Example

As shown in Figures 4 and 5, it is a schematic structural diagram of a miniaturized gas-insulated metal-enclosed switchgear. A miniaturized gas-insulated metal-enclosed switchgear consists of a centralized control cabinet 1, two busbar-side three-position switches 2, and two three-position switches Control cabinet 3, circuit breaker 4, circuit breaker operating device 5, current transformer 6, line side three-position switch operating device 7, line side three-position switch 8 and cable terminal 9, centralized control cabinet 1 is installed in two One side of the three-position switch 2 on the busbar side is respectively connected to the three-position switch 2 on the busbar side, the circuit breaker 4, the current transformer 6, the three-position switch 8 on the line side and the cable terminal 9, and the one side of the circuit breaker 4 passes through two airtight The pot insulators are respectively connected to two three-position switches 2 on the busbar side, and the other side is connected to the current transformer 6 through bolts, and then connected to the three-position switch 8 on the line side through the non-ventilated pot insulator, and the three-position switch 8 on the line side is below Connect the cable terminal 9, the three-position switch operating device 7 on the line side is installed on one side of the three-position switch 8 on the line side, the two three-position switch operating devices 3 are respectively connected to the two three-position switches 2 on the bus side, and the circuit breaker is operated The moving device 5 is located above the circuit breaker 4.

As shown in Figures 6 and 7, it is a schematic structural diagram of a three-position switch on the busbar side. The three-position switch 2 on the busbar side is composed of a housing 10, a three-phase conductive part 11, a pot insulator 12, a grounding switch static contact 13, a transmission device 14, gear 16, moving contact 17, isolating switch static contact 18, the three sides of the housing 10 are respectively connected to the pot insulator 12 by bolts, and the upper and lower ends of each phase conductive part 11 of the three-phase conductive parts are connected to the upper and lower The central conductor of the pot insulator 11 on the side, the static contact 18 of the disconnecting switch is connected to the lower end of the conductive part 11 by bolts, the moving contact 17 is connected to the pot insulator 12 on one side through the conductor 15, and the static contact 13 of the grounding switch is connected by The insulating flange is connected to the upper end of the housing 10, the moving contact 17, the static contact 18 of the isolating switch and the static contact 13 of the grounding switch are on the same center line, and the moving contact 17 is connected to the static contact 18 of the isolating switch and the static contact of the grounding switch 13 are respectively provided with a distance 19, and the transmission device 14 is arranged between the moving contact 17 and the conductor 15, and one side of the transmission device 14 meshes with the rack on the moving contact 17 which can move in a straight line through the gear 16 on the transmission device 14, and the transmission The upper end of the device 14 extends out of the casing 10 through a shaft seal and is connected with the three-position switch operating device 3 .

The transmission device 14 drives the upper rack of the movable contact 17 to move, so that when the movable contact 17 moves to the closing position of the static contact 13 of the grounding switch, it is the grounding switch; when it moves to the closing position of the static contact 18 of the isolating switch, it is the isolating switch ;Move to the middle position, which is the middle opening position, so it is a three-position switch, and the three-position switches are assembled in groups, that is, the combined switches are connected one by one at the basin insulator 12 of the interface, forming a three-phase The connection of the conductive parts 11 thus forms the main bus bar of the miniaturized switch, which has the same function as the main bus bar.

As shown in Figures 8 and 9, it is a schematic structural diagram of a circuit breaker. The circuit breaker 4 is composed of a B-phase insulating pull rod 20, an output shaft upper crank arm 21, a connecting plate 22, A (C) phase operating crank arm 23, A ( C) Phase insulation tie rod 24, three-pole main conductor 25, three-pole interrupter 26, circuit breaker housing 27, and conductor 28. The three-pole interrupter 26 is supported by three insulating columns 20 and 24, forming the shape of "pin" Set in the circuit breaker housing 27, one end of the crank arm 21 on the output shaft is connected to the B-phase insulating pull rod 20, and the other end is connected to the connecting plate 22, and the connecting plate 22 is insulated from the A (C) phase by operating the crank arm 23 of the A (C) phase The pull rods 24 are connected, the three-pole main conductors 25 are respectively connected with the three-pole arc extinguishing chambers 26 , and the conductors 28 are connected with the current transformer 6 .

As shown in Figure 10, it is a schematic diagram of the structure of the arc extinguishing chamber of a miniaturized combined electrical circuit breaker. The described arc extinguishing chamber 26 of each pole is composed of an insulating column 29, a supporting platform 30, an insulating arc extinguishing platform 31, supporting parts 32, 33, and an insulating Platform 34, insulating pull rod 35, active contact 36, main static contact 37, and the shell of arc extinguishing chamber 26 is composed of insulating column 29, supporting platform 30, insulating arc extinguishing platform 31, supporting parts 32, 33 and insulating platform 34 , the insulating pull rod 35, the active contact 36 and the main static contact 37 are installed in the shell, the active contact 36 is installed on the upper end of the main static contact 37, the insulating pull rod 35 is connected with the active contact 36, and the support table 30 is connected to the circuit breaker The three-pole main conductor 25 in 4, one end of the support member 33 is connected to the conductor 28 of the circuit breaker 4, the other end is connected to the current transformer 6, and the insulating platform 34 is connected to the upper flange of the circuit breaker 4.

The three-pole interrupter 26 is supported by three insulating columns 20, 24 and is insulated from the shell. The working current flows from the three-position switch 2 on the side of the busbar into the three-pole interrupter 26 of the circuit breaker, and passes through the main static contact 37, the dynamic The main contact 36 is transmitted to the upper support part 33 of the arc extinguishing chamber, and the conductor installed on the support part 33 flows to the current transformer 6, to the three-position switch 8 on the line side, and then transmitted out through the cable terminal 9.

As shown in Figure 11, it is a schematic structural diagram of a three-position switch on the line side. The three-position switch 8 on the line side includes a three-phase conductive component 38, a pot insulator 39, a housing 40, a static contact 41 of a disconnector, and a transmission device 42 , moving contact 43, grounding switch static contact 44, the middle side of the conductor connection 45 of the three-phase conductive part 38 is provided with a fast grounding switch static contact 46, and the fast grounding switch moving contact 47 passes through the insulating flange 49 Connected to the housing 40 , the moving contact 47 of the quick earthing switch is connected to the transmission device 48 , and the transmission device 48 is connected to the operating mechanism of the external quick earthing switch through the shaft seal 50 .

The rotation shaft of the three-position switch transmission device 42 rotates, driving the rack of the movable contact 43 to move, so that the movable contact 43 moves to the position where it contacts the static contact 41 of the isolating switch, which is the isolating switch, and moves to the static contact of the grounding switch. The position of 44 contacts is exactly the grounding switch; When not contacting with the isolating switch static contact 41, also not contacting with the grounding switch static contact 44, it is the middle opening position. At the same time, its fault grounding switch is installed on the three-position switch shell. When the output shaft of the transmission device 48 rotates, it drives the fault grounding switch movable contact 47 to move left and right, and contacts with the fault grounding switch static contact 46. Its function is the same as that of the original The fault earthing switch is the same.

The principle of the arc extinguishing chamber of the utility model is the same as that used in the original gas-insulated metal-enclosed switch. It adopts the principle of self-energy arc extinguishing, has double nozzles and double gas chambers, and makes full use of the arc itself. Energy, to produce arc blowing effect. Since the energy of the arc is fully utilized to extinguish the arc, the structure adopts a small-diameter air cylinder, and the area of the air cylinder is about 60% of the principle of the air arc extinguishing principle, thereby reducing the reaction of the air cylinder when breaking a large current. Force, reducing the operating work of the mechanism. The transmission device transmits the command of the operating mechanism to the moving contact system in the arc extinguishing chamber to make it move to complete the opening and closing of the circuit breaker. Its breaking current reaches 40kA at 110kV voltage level.

When working, the operation of the line-side three-position switch 6 is driven by the line-side three-position switch operating device 7, the circuit breaker operating mechanism 8 drives the output shaft 21 of the circuit breaker 4 to rotate, and the crank arm on the shaft drives the insulating pull rod 20 to move up and down. And it drives the A (C) phase operating crank arm 23 to rotate, and at the same time, the two-phase insulating rod 24 also moves up and down, thereby driving the three-pole linkage of the circuit breaker arc extinguishing chamber to realize the reliable operation of the circuit breaker opening, closing, or reclosing. The operation of the three-position switch on the bus side is driven by two three-position switch operating mechanisms 3 respectively, and the control and display of the entire interval are realized on the centralized control cabinet 1 .

Claims (6)

1. A miniaturized gas-insulated metal-enclosed switchgear, characterized in that it consists of a centralized control cabinet (1), two busbar side three-position switches (2), two three-position switch operating mechanisms (3), and a circuit breaker ( 4), circuit breaker operating device (5), current transformer (6), line side three-position switch operating device (7), line side three-position switch (8) and cable terminal (9), centralized control cabinet (1) Set on one side of the two three-position switches (2) on the busbar side, respectively connected to the three-position switch (2) on the busbar side, the circuit breaker (4), the current transformer (6), and the three-position switch on the line side (8) Secondary connection with the cable terminal (9), one side of the circuit breaker (4) is respectively connected to two three-position switches (2) on the busbar side through two non-ventilated basin insulators, and the other side is connected to the current transformer ( 6), and then connected to the three-position switch (8) on the line side through the non-ventilated pot insulator, the cable terminal (9) is connected to the bottom of the three-position switch (8) on the line side, and the three-position switch operating device (7) on the line side is set On one side of the three-position switch (8) on the line side, two three-position switch operating mechanisms (3) are respectively connected to two three-position switches (2) on the busbar side, and the circuit breaker operating device (5) is located on the circuit breaker ( 4) above. 2. The miniaturized gas-insulated metal-enclosed switchgear according to claim 1, characterized in that, the three-position switch (2) on the busbar side consists of a housing (10), a three-phase conductive component (11), a basin type The insulator (12), the static contact of the earthing switch (13), the transmission device (14), the gear (16), the moving contact (17), the static contact of the isolating switch (18), and the three sides of the housing (10) The pot insulators (12) are respectively connected by bolts, the upper and lower ends of each phase conductive part (11) of the three-phase conductive parts are connected to the center conductors of the upper and lower pot insulators (12), and the static contacts of the disconnector (18) pass through Bolts are connected to the lower end of the conductive part (11), the moving contact (17) is connected to the pot insulator (12) on one side through the conductor (15), and the static contact (13) of the grounding switch is connected to the housing ( 10) The upper end is connected, the moving contact (17), the static contact of the isolating switch (18) and the static contact of the grounding switch (13) are on the same center line, the moving contact (17) and the static contact of the isolating switch (18) and The static contacts (13) of the earthing switch are respectively provided with a distance 19, and the transmission device (14) is arranged between the movable contact (17) and the conductor (15), and one side thereof passes through the gear (16) on the transmission device (14). Engage with the rack on the moving contact (17) which can move linearly, and the upper end of the transmission device (14) protrudes out of the casing (10) through the shaft seal and connects with the three-position switch operating mechanism (3). 3. The miniaturized gas-insulated metal-enclosed switchgear according to claim 1, characterized in that the circuit breaker (4) consists of a B-phase insulating pull rod (20), a crank arm output shaft (21), a connecting plate ( 22), A (C) phase operation arm (23), A (C) phase insulation pull rod (24), three-pole main conductor (25), three-pole interrupter (26), circuit breaker housing (27), Conductor (28), the three-pole interrupter (26) is supported by three insulating columns (20, 24) and the finished product is arranged in the circuit breaker casing (27), and one end of the crank arm (21) on the output shaft is connected to the B phase Insulation pull rod (20), the other end connects connecting plate (22), and connecting plate (22) is connected with A (C) phase insulating pull rod (24) by A (C) phase operation crutch arm (23), three-pole main conductor ( 25) are respectively connected with the three-pole interrupter (26), and the conductor (28) is connected with the current transformer (6). 4. The miniaturized gas-insulated metal-enclosed switchgear according to claim 3, characterized in that, each pole of the arc extinguishing chamber (26) is composed of an insulating column (29), a supporting platform (30), an insulating arc extinguishing unit (31), support piece (32,33), insulating platform (34), insulating pull bar (35), active contact (36), main fixed contact (37) are made up of, by insulating column (29), supporting platform ( 30), insulating arc extinguishing unit (31), support pieces (32, 33), insulating unit (34) form the shell of arc extinguishing chamber (26), insulating pull rod (35), active contact (36) and main static contact The head (37) is located in the shell, the active contact (36) is located at the upper end of the main static contact (37), the insulating pull rod (35) is connected with the active contact (36), and the support table (30) is connected with the circuit breaker ( The other end of the three-pole main conductor (25) in 4) is connected to the current transformer (6), and the insulating platform (34) is connected to the upper flange of the circuit breaker (4). 5. The miniaturized gas-insulated metal-enclosed switchgear according to claim 1, characterized in that, the three-position switch (8) on the line side comprises a three-phase conductive part (38), a pot insulator (39), a shell body (40), isolating switch static contact (41), transmission device (42), moving contact (43), earthing switch static contact (44), the conductor (45) of the three-phase conductive part (38) ) is connected in the middle with the fast grounding switch static contact (46), the fast grounding switch moving contact (47) is connected to the housing (40) through the insulating flange (49), the fast grounding switch moving contact (47) and the transmission The device (48) is connected, and the transmission system (48) is connected with the external quick earthing switch operating mechanism through the shaft seal (50). 6. The miniaturized gas-insulated metal-enclosed switchgear according to claim 1, characterized in that, the circuit breaker operating device (5) is a spring operating mechanism.

Images