Single-bus segmented prefabricated cabin type GIS combined electric appliance

Abstract

The utility model relates to the technical field of power systems, in particular to a single-bus segmented prefabricated cabin type GIS (gas insulated switchgear). GIS combined electric appliances are arranged in the prefabricated cabin body, two columns of GIS combined electric appliances are arranged, each column is provided with two sets of total combined electric appliances and a plurality of control cabinets, the total combined electric appliances are symmetrically arranged and correspond to one another in position, a first three-station isolation grounding switch is arranged at the upper end of a supporting piece, and the upper end of the first three-station isolation grounding switch is connected with a wire outlet sleeve tee joint through a transposition conductor. One end of the first three-position isolation grounding switch is connected with the current transformer, the current transformer is connected with an interface at the upper end of one side of the circuit breaker, an interface at the lower end of the other side of the circuit breaker is connected with the second three-position isolation grounding switch, and a transposition conductor is arranged on one side of the second three-position isolation grounding switch. Compared with the prior art, the arrangement size of the GIS combined electric appliance is reduced, the equipment cost is reduced, the on-site workload is reduced, transportation is convenient, and prefabricated cabins of different sizes can be adapted more easily.

Description

Technical Field

[0001] This utility model relates to the field of power system technology, specifically a single-busbar segmented prefabricated GIS combined electrical appliance. Background Technology

[0002] Gas-insulated metal-enclosed switchgear (hereinafter referred to as GIS switchgear) is one of the most important power transmission and transformation equipment for the power grid, and its safety and reliability are crucial to the safe operation of the power grid. With the rapid urbanization in China, the miniaturization of power transmission and transformation equipment is particularly emphasized, especially in prefabricated GIS switchgear. GIS switchgear includes control cabinets, circuit breakers, current transformers, voltage transformers, surge arresters, disconnect switches, grounding switches, and maintenance grounding switches. Prefabricated GIS switchgear combines advantages such as small footprint, convenient installation, environmental friendliness, and the elimination of the need for separate GIS rooms for extreme outdoor equipment (extremely low temperatures, sandstorms, high altitudes, etc.), resulting in minimal on-site work and gaining popularity among users.

[0003] Traditional single-busbar segmented GIS switchgear, due to its inclusion of busbars and segmented bays, requires a large footprint for the busbars. Given the height and width restrictions imposed on transport vehicles for prefabricated modules, how to install the GIS switchgear within the prefabricated module is a problem that needs to be solved. Utility Model Content

[0004] To address the problems mentioned in the background art, a single-busbar segmented prefabricated GIS switchgear is provided, comprising a prefabricated cabin containing GIS switchgear. The GIS switchgear is arranged in two rows, each row containing two sets of main switchgear and several control cabinets. Each set of main switchgear is symmetrically arranged and their positions correspond to each other. The main switchgear includes a support component, support feet, a three-position isolation grounding switch one, a three-position isolation grounding switch two, a tee bushing, a sleeve, a current transformer, and a circuit breaker. The upper end of the support component has the three-position isolation grounding switch one, whose upper end is connected to the tee bushing via a transposition conductor. The outlet of the tee bushing is connected to the sleeve. One end of the three-position isolation grounding switch one is connected to the current transformer, which is connected to the upper interface on one side of the circuit breaker. The lower interface on the other side of the circuit breaker is connected to the three-position isolation grounding switch two. A transposition conductor is provided on one side of the three-position isolation grounding switch two. The conductors are arranged in an "L" shape, and the lower end of the three-position isolating grounding switch 2 is equipped with a support foot. The three-position isolating grounding switches 2 of the two sets of main combined electrical appliances in the first column are each connected to the bus equipment bay through a transposition conductor. A grounding switch is provided on one side of the bus equipment bay, and a VT voltage transformer is installed upside down at the upper end of the bus equipment bay. The three-position isolating grounding switches 2 of the first set of main combined electrical appliances in the second column are connected to the three-position isolating grounding switch 3 through a transposition conductor. The other end of the three-position isolating grounding switch 3 is connected to a current transformer. The current transformer is connected to the lower end interface on one side of circuit breaker 2. The upper end interface on the other side of circuit breaker 2 is connected to the three-position isolating grounding switch 4. The other end of the three-position isolating grounding switch 4 is connected to the bus tie tee through a transposition conductor. The bus tie tee is connected to the three-position isolating grounding switch 2 of the other set of main combined electrical appliances through a transposition conductor. The circuit breaker, circuit breaker 2 and bus tie tee of the main combined electrical appliances are arranged in a "Z" shape. The three-position isolating grounding switches 2 of the first and second sets of main combined electrical appliances are connected through a transposition conductor.

[0005] Each group of main electrical appliances is equipped with a DXN series live indicator on its three-position isolating grounding switch.

[0006] The first column of two groups of main combined electrical appliances has a grounding switch two at the lower end of the three-position isolation grounding switch.

[0007] The second column of two sets of total combined electrical appliances has a fast grounding switch at one end of the three-position isolation grounding switch, and a detachable conductor at the other end of the three-position isolation grounding switch. A PT voltage transformer is installed at the lower end of the detachable conductor.

[0008] A surge arrester is provided on the outside of the outgoing sleeve.

[0009] Compared with existing technologies, this invention makes better use of space, reduces the layout size of GIS switchgear, reduces equipment costs, reduces on-site workload, and facilitates transportation. At the same time, the miniaturized GIS switchgear is more easily adaptable to prefabricated cabins of different sizes. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the cross-sectional structure of the first column of GIS combined electrical appliances;

[0011] Figure 2 This is a schematic diagram of the cross-sectional structure of the second column of GIS combined electrical appliances;

[0012] Figure 3 This is a plan view of the present invention;

[0013] See Figures 1 to 3 1. Base frame, 2. Control cabinet, 3. Support components, 4. Support feet, 5. Three-position isolating grounding switch one, 6. Three-position isolating grounding switch two, 7. Outgoing bushing tee, 8. Outgoing sleeve, 9. Current transformer, 10. Circuit breaker, 11. Surge arrester, 12. Busbar equipment bay, 13. Grounding switch, 14. VT voltage transformer, 15. Three-position isolating grounding switch three, 16. Circuit breaker two, 17. Detachable conductor, 18. Fast grounding switch, 19. PT voltage transformer, 20. Three-position isolating grounding switch four, 21. Bus tie tee, 22. Grounding switch two. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] like Figures 1 to 3A single-busbar segmented prefabricated GIS switchgear includes a prefabricated cabin 1, within which GIS switchgear is installed. The GIS switchgear is arranged in two rows, each row containing two sets of main switchgear and several control cabinets 2. Each set of main switchgear is symmetrically arranged and their positions correspond to each other. The main switchgear includes a support 3, support feet 4, a three-position isolation grounding switch 1 5, a three-position isolation grounding switch 2 6, a tee bushing 7, a sleeve bushing 8, a current transformer 9, and a circuit breaker 10. The upper end of the support 3 is equipped with the three-position isolation grounding switch 1 5, and the upper end of the three-position isolation grounding switch 1 5 is connected by a transposition conductor. The outlet of the outlet bushing tee 7 is connected to the outlet sleeve 8. One end of the three-position isolation grounding switch 5 is connected to the current transformer 9. The current transformer (CT) is used to measure the current and provide a current signal to the protection device. The current transformer 9 is connected to the upper interface on one side of the circuit breaker 10. The lower interface on the other side of the circuit breaker 10 is connected to the three-position isolation grounding switch 6. A transposition conductor is provided on one side of the three-position isolation grounding switch 6. The three-position isolation grounding switch 6 and the transposition conductor are arranged in an "L" shape, which helps to save space. The lower end of the three-position isolation grounding switch 6 is provided with a support foot 4.

[0016] The three-position isolation grounding switch 6 of the two groups of main combined electrical appliances in the first column are each connected to the bus equipment bay 12 through the transposition conductor, connecting the busbars of different bays to ensure normal current transmission between equipment. A grounding switch 13 is provided on one side of the bus equipment bay 12, and a VT voltage transformer 14 is installed upside down at the upper end of the bus equipment bay 12, which helps to save space.

[0017] The second set of three-position isolating grounding switches 26 of the main combined electrical appliances are connected to three-position isolating grounding switches 315 via a transposition conductor. The other end of three-position isolating grounding switches 315 is connected to a current transformer. The current transformer is connected to the lower interface on one side of circuit breaker 216. The upper interface on the other side of circuit breaker 216 is connected to three-position isolating grounding switches 420. The other end of three-position isolating grounding switches 420 is connected to bus tie tee 21 via a transposition conductor. Bus tie tee 21 is connected to the three-position isolating grounding switches 26 of another set of main combined electrical appliances via a transposition conductor. The circuit breakers 10, 216 and 21 of the main combined electrical appliances are arranged in a "Z" shape, which helps to save busbar space. The three-position isolating grounding switches 26 of the first and second sets of main combined electrical appliances are connected by a transposition conductor.

[0018] Each group of main electrical appliances is equipped with a DXN series live indicator on its three-position isolating grounding switch 5.

[0019] The first row of two groups of main combined electrical appliances has a three-position isolating grounding switch 5 at its lower end, which is grounding switch 22 to ensure safety during maintenance or repair.

[0020] The lower end of the three-position isolation grounding switch 5 of the two groups of main combined electrical appliances in the second column is equipped with a fast grounding switch 18, and the other end of the three-position isolation grounding switch 5 is equipped with a detachable conductor 17. The lower end of the detachable conductor 17 is equipped with a PT voltage transformer 19, which is used to measure voltage and provide voltage signals for protection devices and instruments.

[0021] A surge arrester 11 is provided on the outside of the outgoing sleeve 8 to protect the equipment from overvoltage.

[0022] By optimizing current distribution through conductor transposition and reducing electromagnetic interference, a segmented single busbar structure is achieved, with the connection between the three-position isolating grounding switch and the busbar. The three-position isolating grounding switch 26 and the transposition conductor are arranged in an "L" shape; the VT voltage transformer 14 is inverted at the upper end of the busbar equipment bay 12; and the circuit breaker 10, circuit breaker 26, and bus tie tee 21 of the main switchgear are arranged in a "Z" shape, saving bay space. This ensures that the embodiment of this invention has a length not exceeding 19m, a height not exceeding 2.9m, and a width not exceeding 2m, allowing the use of standard prefabricated containers.

Claims

1. A single-busbar segmented prefabricated GIS combined electrical system, comprising a prefabricated cabin body, characterized in that: The prefabricated cabin (1) is equipped with a GIS combined electrical system. The GIS combined electrical system is arranged in two rows, each row with two sets of main combined electrical systems and several control cabinets (2). Each set of main combined electrical systems is symmetrically arranged and the positions correspond to each other. The main combined electrical system includes a support (3), a support foot (4), a three-position isolation grounding switch one (5), a three-position isolation grounding switch two (6), a tee for outgoing bushings (7), an outgoing sleeve (8), a current transformer (9), and a circuit breaker (10). The upper end of the support (3) is equipped with a three-position isolation grounding switch one (5). The upper end of the grounding switch 1 (5) is connected to the outgoing bushing tee (7) via a transposition conductor. The outlet of the outgoing bushing tee (7) is connected to the outgoing sleeve (8). One end of the three-position isolation grounding switch 1 (5) is connected to the current transformer (9). The current transformer (9) is connected to the upper interface on one side of the circuit breaker (10). The lower interface on the other side of the circuit breaker (10) is connected to the three-position isolation grounding switch 2 (6). A transposition conductor is provided on one side of the three-position isolation grounding switch 2 (6). The three-position isolation grounding switch 2 (6) and the transposition conductor are arranged in an "L" shape. The lower part of the three-position isolation grounding switch 2 (6) The end is provided with a support foot (4); the two sets of three-position isolation grounding switches of the first column are each connected to the bus equipment bay (12) through a transposition conductor. A grounding switch (13) is provided on one side of the bus equipment bay (12). A VT voltage transformer (14) is installed upside down at the upper end of the bus equipment bay (12); the two sets of three-position isolation grounding switches of the second column are connected to the three-position isolation grounding switch (15) through a transposition conductor. The other end of the three-position isolation grounding switch (15) is connected to a current transformer, and the current transformer is connected to the circuit breaker (16). The lower interface on one side of the circuit breaker 2 (16) is connected to the upper interface on the other side of the three-position isolation grounding switch 4 (20). The other end of the three-position isolation grounding switch 4 (20) is connected to the bus tie tee (21) through the transposition conductor. The bus tie tee (21) is connected to the three-position isolation grounding switch 2 (6) of another group of main combined electrical appliances through the transposition conductor. The circuit breaker (10), circuit breaker 2 (16) and bus tie tee (21) of the main combined electrical appliances are arranged in a "Z" shape. The three-position isolation grounding switches 2 (6) of the first and second columns of the main combined electrical appliances are connected through the transposition conductor.

2. The single-busbar segmented prefabricated GIS combined electrical system according to claim 1, characterized in that: Each group of total combined electrical appliances is equipped with a DXN series live indicator on the three-position isolation grounding switch (5).

3. The single-busbar segmented prefabricated GIS combined electrical system according to claim 1, characterized in that: The first column of two groups of total combined electrical appliances has a grounding switch 2 (22) at the lower end of the three-position isolation grounding switch 1 (5).

4. The single-busbar segmented prefabricated GIS combined electrical system according to claim 1, characterized in that: The second column of two groups of total combined electrical appliances has a fast grounding switch (18) at the lower end of the three-position isolation grounding switch (5) and a detachable conductor (17) at the other end of the three-position isolation grounding switch (5). A PT voltage transformer (19) is provided at the lower end of the detachable conductor (17).

5. The single-busbar segmented prefabricated GIS combined electrical system according to claim 1, characterized in that: A surge arrester (11) is provided on the outside of the outgoing sleeve (8).

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