Bus coupler spacing structure based on double-break disconnecting switch

Abstract

The utility model relates to the field of disconnecting switches, in particular to a bus coupler spacing structure based on a double-break disconnecting switch, which comprises a circuit breaker, a low-side mechanism and a high-side mechanism. The low-side mechanism comprises a bent-neck branch arranged on a low-side outlet of the circuit breaker, and an electric grounding switch a, an isolating switch a and a manual grounding switch a which are connected with the bent-neck branch through a low-side shell; the tail end of the isolating switch a is connected with a bus a; the high-side mechanism comprises a current transformer arranged on a high-position side outlet of the circuit breaker, a horizontal branch bus connected with the current transformer, and an electric grounding switch b, an isolating switch b and a manual grounding switch b which are sequentially connected with the horizontal branch bus through a high-side shell, and the tail end of the isolating switch b is connected with a bus b. According to the isolation switch with the double-fracture structure, another fracture and an independent grounding switch still exist at the maintenance position of the circuit breaker, and the presence of multiple insurance enables the circuit breaker to be maintained in a live-line mode and the maintenance is very safe.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of disconnectors, especially to a bus tie bay structure based on double-break disconnectors. BACKGROUND

[0002] With the development of SF6 gas insulated metal enclosed combined electric appliance, the market requires the reliability of combined electric appliance higher and higher, and the power-off requirement for equipment maintenance is more and more strict, especially the maintenance of important components, such as the circuit breaker, the most important component of bus tie bay, which requires that the bus tie bay does not be powered off during the maintenance, otherwise it means that both buses are powered off, and for the combined electric appliance with double bus wiring form, the whole station needs to be powered off.

[0003] The existing bus tie bay structure uses conventional single-break disconnectors, and two buses need to be maintained, which faces the risk of double bus power-off, and the maintenance of important components faces the problem of double bus or whole station power-off. UTILITY MODEL CONTENTS

[0004] The utility model aims at the problem of maintenance facing double bus or whole station power-off in the background art, and provides a bus tie bay structure based on double-break disconnectors.

[0005] The technical scheme of the utility model: a bus tie bay structure based on double-break disconnectors, comprising a circuit breaker, a low-side mechanism arranged at the low-side outlet of the circuit breaker, and a high-side mechanism arranged at the high-side outlet of the circuit breaker;

[0006] The low-side mechanism comprises a bent neck branch arranged at the low-side outlet of the circuit breaker, and an electric grounding switch a, a disconnector a and a manual grounding switch a connected through a low-side shell with the bent neck branch; the disconnector a is connected with a bus a at the end;

[0007] The high-side mechanism comprises a current transformer arranged at the high-side outlet of the circuit breaker, a horizontal branch bus connected with the current transformer, and an electric grounding switch b, a disconnector b and a manual grounding switch b connected in sequence through a high-side shell with the horizontal branch bus; the high-side shell is electrically connected inside; the disconnector b is connected with a bus b at the end, and the disconnector b is connected with the electric grounding switch b through a straight cylinder branch bus.

[0008] Preferably, the manual grounding switch a and the disconnector a are integrated into a set of components and arranged on the same shell, and are electrically connected inside.

[0009] Preferably, the manual grounding switch b and the disconnector b are integrated into a set of components and fixed on the same shell, and are electrically connected inside.

[0010] Preferably, the manual grounding switch a and the manual grounding switch b are respectively the maintenance grounding switches of the disconnector a and the disconnector b.

[0011] Preferably, it also includes a three-way housing, with the isolating switch a connected to the three-way housing, the internal main circuit being electrically connected, and the horizontal outlet of the three-way housing being connected to the electric grounding switch a and the bent branch respectively.

[0012] Preferably, when disconnector a or disconnector b is in the operating state, both busbar a and busbar b form a double-break isolation state with the circuit breaker. At this time, manually operate manual grounding switch a and manual grounding switch b to make the two breaks form a reliable safety ground.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects: the double-break structure disconnect switch used has two isolation breaks between the circuit breaker maintenance position and the operating busbar, and there is an intermediate grounding between the two breaks. During the circuit breaker maintenance process, even if there is an insulation risk at the first break of the busbar, it will not be transmitted to the maintenance position. Moreover, there is still another break and an independent grounding switch at the circuit breaker maintenance position. The existence of multiple insurances makes the circuit breaker maintenance very safe, even if both busbars are in a live operating state. Attached Figure Description

[0014] Fig. 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0015] Fig. 2 This is a schematic diagram of the bus tie interval principle.

[0016] Reference numerals in the attached diagram: 1. Circuit breaker; 2. Disconnecting switch a; 3. Disconnecting switch b; 4. Manual grounding switch a; 5. Manual grounding switch b; 6. Electrically operated grounding switch a; 7. Electrically operated grounding switch b; 8. Current transformer; 9. Busbar a; 10. Busbar b; 11. Bent branch; 12. Horizontal branch busbar; 13. Straight branch busbar; 14. Tee housing. Detailed Implementation

[0017] Example 1

[0018] like Figs. 1-2 As shown, the present invention proposes a bus tie bay structure based on a double-break disconnector, including a circuit breaker 1, a low-side mechanism disposed at the low-side outlet of the circuit breaker 1, and a high-side mechanism disposed at the high-side outlet of the circuit breaker 1. The circuit breaker 1 is arranged vertically, and both the high and low-side outlets of the circuit breaker 1 are horizontally outgoing and arranged in a U-shape.

[0019] The low-side mechanism includes a bent branch 11 installed on the low-side outlet of the circuit breaker 1, and an electric grounding switch a6, a disconnecting switch a2 and a manual grounding switch a4 connected to the bent branch 11 through the low-side housing; the disconnecting switch a2 is connected to a busbar a9 at its end, and the two are connected by a vertical flange.

[0020] The high-side mechanism includes a current transformer 8 installed at the high-side outlet of circuit breaker 1, a horizontal branch busbar 12 connected to the current transformer 8, and an electric grounding switch b7, a disconnecting switch b3, and a manual grounding switch b5 connected in sequence to the horizontal branch busbar 12 through the high-side housing. The high-side housing is electrically connected inside. The end of the disconnecting switch b3 is connected to the busbar b10 through a vertical flange. The horizontal flange of the disconnecting switch b3 is connected to the electric grounding switch b7 through the straight branch busbar 13.

[0021] Example 2

[0022] like Figs. 1-2 As shown, this utility model proposes a bus tie interval structure based on a double-break disconnect switch. Compared with Embodiment 1, this embodiment further describes some details of the connection structure.

[0023] Manual grounding switch A4 and disconnecting switch A2 are integrated into a single unit, housed in the same casing, and electrically connected internally. Manual grounding switch B5 and disconnecting switch B3 are also integrated into a single unit, fixed in the same casing, and electrically connected internally. Manual grounding switches A4 and B5 serve as maintenance grounding switches for disconnecting switches A2 and B3, respectively.

[0024] It also includes a three-way housing 14, with the disconnecting switch a2 fixedly connected to the three-way housing 14 via a horizontal flange. The internal main circuit is electrically connected. The horizontal outlet of the three-way housing 14 is fixedly connected to the electric grounding switch a6 and the bent branch 11, thereby achieving connection to the low-position side of the circuit breaker 1.

[0025] In summary, when this utility model is in use, if disconnector a2 or disconnector b3 operates, busbars a9 and b10 will both form a double-break isolation state with circuit breaker 1. At this time, manually operating manual grounding switches a4 and b5 will reliably ground the two breaks. Manual grounding switches a4 and b5 are integrated with disconnector a2 and b3 respectively, significantly reducing equipment size. During use, this integrated structure forms multiple grounding points with electric grounding switches a6 and b, greatly improving the safety and reliability of circuit breaker 1 maintenance. Simultaneously, operations at the maintenance location will not affect the operating busbars a9 and b10. With its small size and high reliability, this invention has significant practical and economic value, especially for equipment maintenance and operation, and has been widely used in 252 kV combined electrical system projects.

[0026] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A bus tie bay structure based on a double-break disconnector, characterized in that, Includes a circuit breaker (1), a low-side mechanism provided at the low-side outlet of the circuit breaker (1), and a high-side mechanism provided at the high-side outlet of the circuit breaker (1). The low-side mechanism includes a bent branch (11) installed on the low-side outlet of the circuit breaker (1), and an electric grounding switch a (6), a disconnecting switch a (2) and a manual grounding switch a (4) connected to the bent branch (11) through the low-side housing; the disconnecting switch a (2) is connected to a busbar a (9) at its end; The high-side mechanism includes a current transformer (8) installed on the high-side outlet of the circuit breaker (1), a horizontal branch busbar (12) connected to the current transformer (8), and an electric grounding switch b (7), a disconnecting switch b (3) and a manual grounding switch b (5) connected in sequence to the horizontal branch busbar (12) through the high-side housing. The high-side housing is electrically connected inside. The disconnecting switch b (3) is connected to a busbar b (10) at its end. The disconnecting switch b (3) is connected to the electric grounding switch b (7) through a straight branch busbar (13).

2. The bus tie bay structure based on a double-break disconnector as described in claim 1, characterized in that, The manual grounding switch a(4) and the disconnecting switch a(2) are integrated into a single component, housed on the same housing, and are electrically connected internally.

3. The bus tie bay structure based on a double-break disconnector according to claim 1, characterized in that, The manual grounding switch b(5) and the disconnecting switch b(3) are integrated into a single component, fixed on the same housing, and electrically connected internally.

4. The bus tie bay structure based on a double-break disconnector as described in claim 1, characterized in that, Manual grounding switch a(4) and manual grounding switch b(5) are maintenance grounding switches for disconnecting switch a(2) and disconnecting switch b(3), respectively.

5. The bus tie bay structure based on a double-break disconnector according to claim 1, characterized in that, It also includes a three-way housing (14), with the isolating switch a (2) connected to the three-way housing (14), the internal main circuit being electrically connected, and the horizontal outlet of the three-way housing (14) being connected to the electric grounding switch a (6) and the bent branch (11) respectively.

6. The bus tie bay structure based on a double-break disconnector according to claim 1, characterized in that, When disconnector a(2) or disconnector b(3) is in operation, bus a(9) and bus b(10) are both isolated from circuit breaker (1) by double break. At this time, manually operate manual grounding switch a(4) and manual grounding switch b(5) to make the two breaks form a reliable safety ground.

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