CN103700539A - Vacuum circuit breaker for switching capacitor bank gas insulated switch cabinet - Google Patents

Abstract

The invention discloses a vacuum circuit breaker for cutting a capacitor bank gas insulated switchgear, which comprises an upper contact, a first vacuum interrupter assembly, a first contact spring device, a second contact spring device, a second The vacuum interrupter assembly, the lower contact, the conductive series assembly, and the transmission power mechanism that are respectively hinged to the first contact spring device and the second contact spring device and push them to move toward each other or move in opposite directions, the first vacuum extinguisher The static end of the arc chamber assembly is electrically connected to the upper contact, the moving end of the first vacuum interrupter assembly is connected to the first contact spring device, and the static end of the second vacuum interrupter assembly is connected to the lower contact. Electrically connected, the moving end of the second vacuum interrupter assembly is connected to the second contact spring device, the moving end of the first vacuum interrupter assembly and the moving end of the second vacuum interrupter assembly are connected through a conductive series assembly Electrically connected in series. The invention can realize two opening fractures or closing connections at the same time, thereby increasing the effectiveness of the opening and closing states, effectively improving the insulation withstand voltage level of the opening fracture, reducing the probability of heavy breakdown, and enhancing breaking capacitive current capability.

Description

Vacuum circuit breaker for cutting capacitor bank gas insulated switchgear

technical field

The invention relates to a vacuum circuit breaker for cutting a capacitor bank gas insulated switchgear, belonging to the technical field of electrical equipment.

Background technique

At present, gas insulated switchgear is more and more widely used in power distribution systems, and there are more and more occasions involving breaking capacitive currents. In the process of breaking capacitive currents in power systems, the probability of heavy breakdown is relatively high , which has a relatively large impact on the power grid. Research shows that the occurrence of restrike mainly depends on the insulation withstand voltage level of the opening fracture after the vacuum circuit breaker breaks the capacitive current, and according to the breakdown voltage gain effect of the vacuum switch, it is found that the circuit breaker with double vacuum interrupters in series The fracture withstand voltage level is 2.5 times that of a circuit breaker with a single vacuum interrupter.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the prior art, and provide a vacuum circuit breaker for cutting capacitor bank gas insulated switchgear, which can realize two opening fractures or closing connections at the same time, thereby increasing The status validity of opening and closing can effectively improve the insulation withstand voltage level of the opening fracture, reduce the probability of re-breakdown, and enhance the breaking capacity of capacitive current.

In order to solve the above technical problems, the technical solution of the present invention is: a vacuum circuit breaker for cutting capacitor bank gas insulated switchgear, which includes an upper contact, a first vacuum interrupter assembly, a first contact spring device, The second contact spring device, the second vacuum interrupter assembly, the lower contact, the conductive series assembly, and the first contact spring device and the second contact spring device are hinged respectively and push them to move toward each other or move away from each other The transmission power mechanism of the first vacuum interrupter assembly is electrically connected to the upper contact, the moving end of the first vacuum interrupter assembly is connected to the first contact spring device, and the second vacuum interrupter The static end of the assembly is electrically connected to the lower contact, the moving end of the second vacuum interrupter assembly is connected to the second contact spring device, the moving end of the first vacuum interrupter assembly is connected to the second vacuum interrupter The movable end of the component is electrically connected in series through the conductive series component.

Further provided is a structural form of a conductive series assembly, the conductive series assembly includes a first conductive clip, a first flexible connecting body, a conductive connecting row, a second flexible connecting body and a second conductive clip electrically connected in sequence , the first conductive clip is connected to the moving end of the first vacuum interrupter assembly, and the second conductive clip is connected to the moving end of the second vacuum interrupter assembly.

Further, in order to improve the insulation performance of the opening fracture, a shielding cover is arranged on the periphery of the connection between the first contact spring device, the second contact spring device and the transmission power mechanism, and the two ends of the shielding cover A first bracket and a second bracket are respectively provided, the lower end of the first vacuum interrupter assembly is fixedly connected to the first bracket, and the moving end of the first vacuum interrupter assembly extends into the shielding case, so The upper end of the second vacuum interrupter assembly is fixedly connected to the second bracket, and the moving end of the second vacuum interrupter assembly extends into the shielding case.

Further, the first bracket and the second bracket are respectively provided with supporting insulators for installation and fixing.

Furthermore, the transmission power mechanism includes an energy storage mechanism, an energy storage shaft, a first crank arm, a closing trip, an opening trip, a second crank arm, a main shaft, a third crank arm, a connecting rod, an energy storage Spring, bellows assembly, three-link transmission mechanism, insulating pull rod and double transmission structure, the output end of the energy storage mechanism is matched with the energy storage shaft, the first crank arm is arranged on the energy storage shaft, and the first crank arm The brake release is used to fix the position of the energy storage shaft, the third crank arm is set on the main shaft, and the third crank arm is matched with the opening trip to fix the position of the main shaft, and the second crank arm is also set On the main shaft, and the second crank arm is hinged with the three-link transmission mechanism, and the three-link transmission mechanism is also hinged with one end of the bellows assembly, and the other end of the bellows assembly is connected by an insulating pull rod, which passes through a double transmission structure They are respectively hinged with the first contact spring device and the second contact spring device, the lower end of the energy storage spring is connected with the energy storage shaft, one end of the connecting rod is connected with the energy storage shaft, and the other end of the connecting rod is connected with the main shaft .

After adopting the above technical scheme, the first vacuum interrupter assembly and the second vacuum interrupter assembly are connected in series through the conductive series assembly in the middle, and the simultaneous opening and closing are realized through the transmission power mechanism, forming two One opening fracture, two closing connection ports are formed when closing, thus increasing the effectiveness of the opening and closing states, and a shielding cover is installed to even out the electric field, which can effectively improve the insulation withstand voltage level of the opening fracture , reduce the probability of heavy breakdown, and enhance the ability to break capacitive current.

Description of drawings

Fig. 1 is the structure diagram of the vacuum circuit breaker used for cutting capacitor bank gas insulated switchgear of the present invention;

Fig. 2 is a partial structural sectional view of Fig. 1;

Fig. 3 is a structural schematic diagram of the transmission power mechanism of the present invention.

Detailed ways

In order to make the content of the present invention more clearly understood, the present invention will be further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

As shown in Figures 1 and 2, a vacuum circuit breaker for cutting capacitor bank gas insulated switchgear, it includes an upper contact 1, a first vacuum interrupter assembly 2, a first contact spring device 3, a second The contact spring device 4, the second vacuum interrupter assembly 5, the lower contact 6, the conductive series assembly are respectively hinged with the first contact spring device 3 and the second contact spring device 4 and push them to move toward each other or The transmission power mechanism that moves in opposite directions, the static end of the first vacuum interrupter assembly 2 is electrically connected to the upper contact 1, and the moving end of the first vacuum interrupter assembly 2 is connected to the first contact spring device 3 , the static end of the second vacuum interrupter assembly 5 is electrically connected to the lower contact 6, the moving end of the second vacuum interrupter assembly 5 is connected to the second contact spring device 4, and the first vacuum interrupter The moving end of the assembly 2 and the moving end of the second vacuum interrupter assembly 5 are electrically connected in series through the conductive series assembly.

As shown in Figure 2, the conductive series assembly includes a first conductive clip 7, a first flexible connecting body 8, a conductive connecting row 9, a second flexible connecting body 10 and a second conductive clip 11, which are electrically connected in sequence. The clip 7 is connected to the moving end of the first vacuum interrupter assembly 2 , and the second conductive clip 11 is connected to the moving end of the second vacuum interrupter assembly 5 .

As shown in Figure 2, the first contact spring device 3, the second contact spring device 4, and the transmission power mechanism are provided with a shielding cover 12 on the periphery of the connecting part of the two, and the two ends of the shielding cover 12 are also provided with The first bracket 12-1 and the second bracket 12-2, the lower end of the first vacuum interrupter assembly 2 is fixedly connected with the first bracket 12-1, and the moving end of the first vacuum interrupter assembly 2 extends into the shielding Inside the cover 12, the upper end of the second vacuum interrupter assembly 5 is fixedly connected to the second bracket 12-2, and the moving end of the second vacuum interrupter assembly 5 extends into the shielding cover.

As shown in FIG. 2 , support insulators 13 for mounting and fixing are respectively provided on the first support 12 - 1 and the second support 12 - 2 .

As shown in Figure 3, the transmission power mechanism includes an energy storage mechanism 14, an energy storage shaft 15, a first crank arm 16, a closing trip 17, an opening trip 18, a second crank arm 19, a main shaft 20, a third crank Arm 21, connecting rod 22, energy storage spring 23, bellows assembly 24, three-link transmission mechanism 25, insulating pull rod 26 and double transmission structure 27, the output end of energy storage mechanism 14 cooperates with energy storage shaft 15, the first The crank arm 16 is arranged on the energy storage shaft 15, and the first crank arm 16 cooperates with the closing trip 17 so as to fix the position of the energy storage shaft 15, the third crank arm 21 is arranged on the main shaft 20, and the third The crank arm 21 cooperates with the opening trip 18 so as to be used to fix the position of the main shaft 20, the second crank arm 19 is also arranged on the main shaft 20, and the second crank arm 20 is hinged with the three-link transmission mechanism 25, and the three-link The rod transmission mechanism 25 is also hinged with one end of the bellows assembly 24, and the other end of the bellows assembly 24 is connected through an insulating pull rod 26, and the insulating pull rod 26 is respectively connected to the first contact spring device 3 and the second contact through a double transmission structure 27. The spring device 4 is hinged, the lower end of the energy storage spring 23 is connected with the energy storage shaft 15, one end of the connecting rod 22 is connected with the energy storage shaft 15, and the other end of the connecting rod 22 is connected with the main shaft 20. The bellows assembly 24 is installed on the circuit breaker frame 40 , and a sealing ring 41 is provided at the connection between the bellows assembly 24 and the circuit breaker frame 40 , and a sealing ring 41 is also provided at the connection between the circuit breaker frame 40 and the cabinet 42 .

The working principle of the present invention is as follows:

The action of the energy storage mechanism drives the energy storage shaft 15 to rotate, thereby compressing the energy storage spring 23 to obtain the closing energy, and at the same time, the first crank arm 16 rotates to be locked in the closing trip 17, the energy storage is completed, and the closing and tripping 17 is unlocked, the energy storage spring 23 releases energy, and the energy storage shaft 15 rotates and pulls the connecting rod 22, thereby driving the main shaft 20 to rotate, and the second crank arm 19 and the third crank arm 21 on the main shaft 20 also rotate simultaneously; the second crank arm 19 Push the three-link transmission structure 25 to move, thereby pushing the bellows assembly 24 to move to the right, driving the insulating rod 26 to move to the right, thereby simultaneously pushing the moving end and the static end of the first vacuum interrupter assembly 2 to contact and the second vacuum The moving end of the arc extinguishing chamber assembly 5 is in contact with the static end, so that the switch is turned on and turned on. At the same time, the third crank arm 21 rotates to the opening trip 18 and is locked; the opening trip 18 is unlocked, and the first contact The spring device 3 and the second contact spring device 4 release energy at the same time, so that the bellows assembly 24 and the three-link transmission structure 25 move in opposite directions, and finally the moving end and the static end of the first vacuum interrupter assembly 2 and the second The moving end and the static end of the second vacuum interrupter assembly 5 are separated at the same time to realize switch-off and power-off. Realize opening and closing at the same time, form two opening fractures when opening, and form two closing connections when closing, thus increasing the status effectiveness of breaking and closing, and installing a shielding cover, uniform The electric field can effectively improve the insulation withstand voltage level of the opening fracture, reduce the probability of heavy breakdown, and enhance the ability to break capacitive current.

The specific embodiments described above have further described the technical problems, technical solutions and beneficial effects solved by the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (5)

1. A vacuum circuit breaker for cutting capacitor bank gas insulated switchgear, characterized in that it includes an upper contact (1), a first vacuum interrupter assembly (2), a first contact spring device (3 ), the second contact spring device (4), the second vacuum interrupter assembly (5), the lower contact (6), the conductive series assembly and the first contact spring device (3) and the second contact The spring device (4) is hinged and pushes the two to move towards each other or move against each other. The static end of the first vacuum interrupter assembly (2) is electrically connected to the upper contact (1), and the first vacuum The moving end of the interrupter assembly (2) is connected to the first contact spring device (3), the static end of the second vacuum interrupter assembly (5) is electrically connected to the lower contact (6), and the second The movable end of the vacuum interrupter assembly (5) is connected with the second contact spring device (4), and the movable end of the first vacuum interrupter assembly (2) and the movable end of the second vacuum interrupter assembly (5) The terminals are electrically connected in series through a conductive series component. 2. The vacuum circuit breaker for cutting capacitor bank gas insulated switchgear according to claim 1, characterized in that: the conductive series assembly includes a first conductive clip (7), a first The flexible connector (8), the conductive connecting bar (9), the second flexible connector (10) and the second conductive clip (11), the first conductive clip (7) and the first vacuum interrupter assembly (2) The moving end is connected, and the second conductive clip (11) is connected with the moving end of the second vacuum interrupter assembly (5). 3. The vacuum circuit breaker for cutting capacitor bank gas insulated switchgear according to claim 1, characterized in that: the first contact spring device (3), the second contact spring device (4) and A shielding case (12) is arranged on the periphery of the connection part between the transmission power mechanism and the two, and the two ends of the shielding case (12) are respectively provided with a first bracket (12-1) and a second bracket (12-2), The lower end of the first vacuum interrupter assembly (2) is fixedly connected to the first bracket (12-1), and the moving end of the first vacuum interrupter assembly (2) extends into the shielding cover (12) , the upper end of the second vacuum interrupter assembly (5) is fixedly connected to the second bracket (12-2), and the moving end of the second vacuum interrupter assembly (5) extends into the shielding case. 4. The vacuum circuit breaker for cutting capacitor bank gas insulated switchgear according to claim 1, characterized in that: the first bracket (12-1) and the second bracket (12-2) are respectively set There are support insulators (13) for mounting and fixing. 5. The vacuum circuit breaker for cutting capacitor bank gas insulated switchgear according to claim 1, characterized in that: the transmission power mechanism includes an energy storage mechanism (14), an energy storage shaft (15), a first crank arm (16), closing trip (17), opening trip (18), second crank arm (19), main shaft (20), third crank arm (21), connecting rod (22), storage Energy spring (23), bellows assembly (24), three-link transmission mechanism (25), insulating pull rod (26) and double transmission structure (27), the output end of the energy storage mechanism (14) and the energy storage shaft (15 ), the first crank arm (16) is set on the energy storage shaft (15), and the first crank arm (16) cooperates with the closing trip (17) to fix the energy storage shaft (15) position, the third crank arm (21) is set on the main shaft (20), and the third crank arm (21) cooperates with the opening trip (18) to fix the position of the main shaft (20), the second crank arm (19) is also arranged on the main shaft (20), and the second crank arm (20) is hinged with the three-link transmission mechanism (25), and the three-link transmission mechanism (25) is also connected with one end of the bellows assembly (24) The other end of the bellows assembly (24) is connected by an insulating pull rod (26), and the insulating pull rod (26) is respectively connected to the first contact spring device (3) and the second contact spring device through a double transmission structure (27). (4) are hinged, the lower end of the energy storage spring (23) is connected to the energy storage shaft (15), one end of the connecting rod (22) is connected to the energy storage shaft (15), and the other end of the connecting rod (22) is connected to the The main shaft (20) is connected.

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