CN112151301B - Arc extinguish chamber and circuit breaker - Google Patents

Abstract

The invention relates to an arc extinguishing chamber and a circuit breaker. The arc extinguishing chamber includes a parallel opening and closing main circuit and an opening and closing resistance branch circuit. The opening and closing main circuit includes a main fracture, and the opening and closing resistance branch includes a closing circuit. Resistor, moving side resistance contact and static side resistance contact, the moving side resistance contact and the static side resistance contact form a resistance fracture, the resistance fracture and the main fracture are arranged side by side in the width direction of the arc extinguishing chamber, the closing resistance includes The moving-side closing resistor and the static-side closing resistor set on both sides of the resistance break, when the resistance break takes precedence over the closing of the main break, the moving-side closing resistor and the static-side closing resistor each share a part of the voltage in the closing resistance branch , to reduce the pressure difference between the position of the resistance fracture and the static contact, thereby reducing the insulation distance between the main fracture and the resistance fracture that meets the insulation requirements, which helps to improve the compactness of the structure of the arc extinguishing chamber and reduce the The size of the arc extinguishing chamber in the width direction reduces the volume of the arc extinguishing chamber and the entire circuit breaker.

Description

A kind of arc extinguishing chamber and circuit breaker

technical field

The invention relates to an arc extinguishing chamber and a circuit breaker.

Background technique

The closing resistor is an important part of EHV and UHV circuit breakers, which can better limit the closing overvoltage of the AC system and prevent the operation overvoltage that endangers the safety of the power grid when closing the long line without load. In the prior art, the arc extinguishing chamber of the circuit breaker is generally cylindrical. The arc extinguishing chamber includes the opening and closing main circuit where the main fracture is located. The main fracture is formed by the moving contact and the static contact connected in series in the opening and closing main circuit. The arc extinguishing chamber also includes a closing resistance branch connected in parallel to the main road. The closing resistance branch has a closing resistance and a resistance fracture. The side resistance contact is formed, and the arc extinguishing chamber also includes a driving mechanism, which is used to drive the moving contact and the moving side resistance contact, so as to realize the closing and opening of the main fracture and the resistance fracture. The closing resistor is generally set on the moving side or static side of the closing circuit branch, and the resistance fracture is generally arranged in parallel with the main fracture of the opening and closing main circuit in the radial direction of the arc extinguishing chamber. For insulation, it is necessary to reserve an insulation distance between the main fracture and the resistance fracture, which will increase the shielding structure and the outer diameter of the arc extinguishing chamber accordingly. In order to ensure the insulation reliability of the circuit breaker, the distance between the arc extinguishing chamber and the circuit breaker housing The insulation distance remains unchanged, so the size of the circuit breaker housing will also be larger, and the amount of sulfur hexafluoride in the circuit breaker housing will also increase.

Contents of the invention

The purpose of the present invention is to provide an arc extinguishing chamber to solve the technical problem in the prior art that the volume of the arc extinguishing chamber in the closing resistor branch is relatively large; the corresponding purpose of the present invention is also to provide a circuit breaker to solve In the prior art, the size of the circuit breaker with the closing resistor branch is relatively large, and the consumption of sulfur hexafluoride in the circuit breaker is relatively large.

The arc extinguishing chamber of the present invention adopts the following technical scheme:

The interrupter includes:

The main circuit of opening and closing, including the moving contact and the static contact, the moving contact and the static contact form the main fracture;

The opening and closing resistance branch circuit is arranged in parallel with the opening and closing main circuit, including the closing resistance, the moving side resistance contact and the static side resistance contact, and the moving side resistance contact and the static side resistance contact form a resistance fracture;

The transmission mechanism is used for transmission connection with the operating mechanism to drive the moving contact and the resistance contact on the moving side to realize the closing and opening of the main fracture and the resistance fracture;

The closing resistance includes the moving side closing resistance and the static side closing resistance. The moving side closing resistance is conductively connected between the moving contact and the moving side resistance contact, and the static side closing resistance is conductively connected between the static contact and the static side. between the resistive contacts.

The beneficial effects of the present invention are: in the arc extinguishing chamber of the present invention, the closing resistance includes a moving side closing resistance and a static side closing resistance, and the moving side closing resistance and the static side closing resistance are respectively arranged on both sides of the resistance fracture, When the main break is closed with the priority of the resistance break, the closing resistance of the moving side and the closing resistance of the static side each share a part of the voltage in the closing resistance branch, so as to reduce the pressure difference between the position of the resistance break and the charged static contact , so that the insulation distance between the main fracture and the resistance fracture that meets the insulation requirements can be reduced, which helps to improve the compactness of the structure of the arc extinguishing chamber, reduce the size of the arc extinguishing chamber in the width direction, and reduce the volume of the arc extinguishing chamber .

Further, the arc extinguishing chamber also includes a moving support and a static support, the static support and the moving support are used to be fixed in the circuit breaker housing, the moving contacts are conductively arranged on the moving support, and the static contacts are conductively arranged on the static On the support, the static side resistance contact is mounted on the static support, the static side resistance contact is equipped with a static side resistance contact seat, the static side resistance contact seat is insulated and fixedly connected with the static support, and the moving side resistance contact is worn On the moving support, the moving side resistance contact is equipped with a moving side resistance contact seat, and the moving side resistance contact seat is insulated and fixedly connected with the moving support, so that the main fracture and the resistance fracture are both located between the static support and the moving support .

Its beneficial effects are: in the configuration of the above-mentioned combined moving-side resistance contact seat structure, the moving-side resistance contact is installed in the moving support, the static-side resistance contact is installed in the static support, and the moving contact is conductively arranged in the moving support. On the support, the static contact is conductively arranged on the static support, so that the main fracture and the resistance fracture are located between the static support and the dynamic support, so that the main fracture and the resistance fracture are not affected by the static support and the dynamic support. The size limit meets the minimum distance between the main fracture and the resistance port under the condition of insulation distance, which helps to improve the structure compactness of the arc extinguishing chamber.

Further, both the moving-side closing resistance and the static-side closing resistance are extended in the moving direction of the moving contact;

There are at least two groups of moving-side closing resistors. The moving-side closing resistors arranged in groups are arranged in parallel in the direction perpendicular to the movement of the moving contacts. The moving-side closing resistors arranged in groups are connected in series. The conductive connection end of the moving contact connected to the moving contact on the resistance is conductively and fixedly connected to the moving support, and the conductive connection end of the moving resistance contact connected to the moving resistance contact on the moving side closing resistor connected in series is connected to the moving support. The side resistor contacts are electrically and fixedly connected; and/or there are at least two groups of closing resistors on the static side, the closing resistors on the static side arranged in groups are arranged in parallel in the direction perpendicular to the moving The closing resistors are connected in series, the static side closing resistors connected in series with the static contacts are conductively connected to the static contact conductive connection end and the static support is conductively connected, the static side closing resistors connected in series are conductively connected with the static side resistance contacts The conductive connection end of the static side resistance contact is conductively and fixedly connected with the static side resistance contact seat.

Its beneficial effect is: the above-mentioned structural arrangement can reduce the size of the closing resistance on the moving side and/or the closing resistance on the static side in the moving direction of the moving contact, and help to reduce the distance between the arc extinguishing chamber and the moving direction of the moving contact. size.

Further, both the conductive connection end of the moving-side resistance contact and the conductive connection end of the moving contact are at the end of the moving-side closing resistor, which is close to the moving support.

Its beneficial effect is: the above-mentioned structural arrangement can make the conductive connection end of the moving side resistance contact and the conductive connection end of the moving contact close to the moving support, so as to realize the connection between the moving side closing resistor and the moving side resistance contact seat respectively. fixed connection between.

Further, in the moving direction of the moving contact, the moving-side closing resistance is set on the side of the moving support facing away from the main fracture, and the end of the moving-side closing resistance close to the moving support is fixed on the moving support, far away from the moving support. One end of the seat is fixed on the transmission mechanism through the moving side insulator.

Its beneficial effects are: in the above-mentioned structural setting, one end of the closing resistance on the moving side is fixed on the moving support at both ends of the moving direction of the moving contact, and the other end is fixed on the transmission mechanism, which helps to improve the speed of the moving side in the arc extinguishing chamber. Structural stability of closing resistors.

Further, the moving-side resistance contact is equipped with a moving-side resistance contact rod, and the moving-side resistance contact rod extends along the moving direction of the moving contact. The moving direction of the head is arranged at intervals to form an active space for the resistance contact rod on the power supply side to move back and forth in the moving direction of the moving contact.

The beneficial effect is: in the above structural arrangement, the moving side resistor contact rod is movably arranged between two groups of moving side closing resistors, which helps to improve the compactness of the structure of the arc extinguishing chamber and reduce the volume of the arc extinguishing chamber.

Further, the conductive connection end of the static side resistance contact and the conductive connection end of the static contact are both ends of the closing resistor on the static side that are close to the static support.

Its beneficial effect is: the above-mentioned structural setting can make the conductive connection end of the static side resistance contact and the conductive connection end of the static contact be arranged close to the static support, so as to realize the connection between the static side closing resistor and the static support and the static side resistance contact seat respectively. fixed connection between.

Further, in the moving direction of the moving contact, the static side closing resistor is set on the side of the static support facing away from the main fracture, and the end of the static side closing resistor close to the static support is fixed on the static support, far away from the static support. One end of the seat is fixed on the static side resistance contact seat through the static side insulator.

Its beneficial effects are: in the above-mentioned structural setting, one end of the closing resistor on the static side is fixed on the static support at both ends of the moving direction of the moving contact, and the other end is fixed on the resistance contact seat on the static side, which helps to improve the arc extinguishing chamber. Structural stability of the closing resistor on the neutral side.

Further, the moving-side resistance contact seat is fixed on the moving support through the moving-side insulator, and the static-side resistance contact seat is fixed on the static support through the static-side insulator, and the moving-side insulator and the static-side insulator At least one is fixed between the dynamic support and the static support.

Its beneficial effect is: since the main fracture requires a large installation space in the moving direction of the moving contact, the above-mentioned structural arrangement can make full use of the space between the moving support and the static support, which helps to increase the compactness of the structure of the arc extinguishing chamber , can reduce the size of the arc extinguishing chamber in the moving direction of the moving contact.

The circuit breaker of the present invention adopts the following technical scheme: the circuit breaker includes a circuit breaker housing, the circuit breaker housing is provided with an operating mechanism and an arc extinguishing chamber, the operating structure is connected to the arc extinguishing chamber in transmission, and the arc extinguishing chamber includes:

The main circuit of opening and closing, including the moving contact and the static contact, the moving contact and the static contact form the main fracture;

The opening and closing resistance branch circuit is arranged in parallel with the opening and closing main circuit, including the closing resistance, the moving side resistance contact and the static side resistance contact, and the moving side resistance contact and the static side resistance contact form a resistance fracture;

The transmission mechanism is used for transmission connection with the operating mechanism to drive the moving contact and the resistance contact on the moving side to realize the closing and opening of the main fracture and the resistance fracture;

The closing resistance includes the moving side closing resistance and the static side closing resistance. The moving side closing resistance is conductively connected between the moving contact and the moving side resistance contact, and the static side closing resistance is conductively connected between the static contact and the static side. between the resistive contacts.

The beneficial effects of the present invention are: in the arc extinguishing chamber of the circuit breaker of the present invention, the closing resistance includes a moving side closing resistance and a static side closing resistance, and the moving side closing resistance and the static side closing resistance are respectively arranged at two ends of the resistance fracture. side, when the main break is closed with the priority of the resistance break, the closing resistance of the moving side and the closing resistance of the static side each share a part of the voltage in the closing resistance branch, so as to reduce the gap between the position of the resistance break and the charged static contact. The pressure difference can reduce the insulation distance between the main fracture and the resistance fracture that meets the insulation requirements, which helps to improve the compactness of the structure of the arc extinguishing chamber and the circuit breaker, and reduces the distance between the arc extinguishing chamber and the circuit breaker in the width direction of the arc extinguishing chamber. The above size reduces the volume of the arc extinguishing chamber and circuit breaker.

Further, the arc extinguishing chamber also includes a moving support and a static support, the static support and the moving support are used to be fixed in the circuit breaker housing, the moving contacts are conductively arranged on the moving support, and the static contacts are conductively arranged on the static On the support, the static side resistance contact is mounted on the static support, the static side resistance contact is equipped with a static side resistance contact seat, the static side resistance contact seat is insulated and fixedly connected with the static support, and the moving side resistance contact is worn On the moving support, the moving side resistance contact is equipped with a moving side resistance contact seat, and the moving side resistance contact seat is insulated and fixedly connected with the moving support, so that the main fracture and the resistance fracture are both located between the static support and the moving support .

Its beneficial effects are: in the configuration of the above-mentioned combined moving-side resistance contact seat structure, the moving-side resistance contact is installed in the moving support, the static-side resistance contact is installed in the static support, and the moving contact is conductively arranged in the moving support. On the support, the static contact is conductively arranged on the static support, so that the main fracture and the resistance fracture are located between the static support and the dynamic support, so that the main fracture and the resistance fracture are not affected by the static support and the dynamic support. The size limit meets the minimum distance between the main fracture and the resistance port under the condition of the insulation distance requirement, which helps to improve the structure compactness of the arc extinguishing chamber and the circuit breaker.

Further, both the moving-side closing resistance and the static-side closing resistance are extended in the moving direction of the moving contact;

There are at least two groups of moving-side closing resistors. The moving-side closing resistors arranged in groups are arranged in parallel in the direction perpendicular to the movement of the moving contacts. The moving-side closing resistors arranged in groups are connected in series. The conductive connection end of the moving contact connected to the moving contact on the resistance is conductively and fixedly connected to the moving support, and the conductive connection end of the moving resistance contact connected to the moving resistance contact on the moving side closing resistor connected in series is connected to the moving support. The side resistor contacts are electrically and fixedly connected; and/or there are at least two groups of closing resistors on the static side, the closing resistors on the static side arranged in groups are arranged in parallel in the direction perpendicular to the moving The closing resistors are connected in series, the static side closing resistors connected in series with the static contacts are conductively connected to the static contact conductive connection end and the static support is conductively connected, the static side closing resistors connected in series are conductively connected with the static side resistance contacts The conductive connection end of the static side resistance contact is conductively and fixedly connected with the static side resistance contact seat.

Its beneficial effect is: the above-mentioned structural arrangement can reduce the size of the moving side closing resistance and/or the static side closing resistance in the moving direction of the moving contact, and help to reduce the size of the arc extinguishing chamber and the circuit breaker when the moving contact moves. Dimensions in the direction.

Further, both the conductive connection end of the moving-side resistance contact and the conductive connection end of the moving contact are at the end of the moving-side closing resistor, which is close to the moving support.

Its beneficial effect is: the above-mentioned structural arrangement can make the conductive connection end of the moving side resistance contact and the conductive connection end of the moving contact close to the moving support, so as to realize the connection between the moving side closing resistor and the moving side resistance contact seat respectively. fixed connection between.

Further, in the moving direction of the moving contact, the moving-side closing resistance is set on the side of the moving support facing away from the main fracture, and the end of the moving-side closing resistance close to the moving support is fixed on the moving support, far away from the moving support. One end of the seat is fixed on the transmission mechanism through the moving side insulator.

Its beneficial effects are: in the above-mentioned structural setting, one end of the closing resistance on the moving side is fixed on the moving support at both ends of the moving direction of the moving contact, and the other end is fixed on the transmission mechanism, which helps to improve the speed of the moving side in the arc extinguishing chamber. Structural stability of closing resistors.

Further, the moving-side resistance contact is equipped with a moving-side resistance contact rod, and the moving-side resistance contact rod extends along the moving direction of the moving contact. The moving direction of the head is arranged at intervals to form an active space for the resistance contact rod on the power supply side to move back and forth in the moving direction of the moving contact.

Its beneficial effects are: in the above-mentioned structural arrangement, the moving-side resistor contact rod is movably arranged between the two groups of moving-side closing resistors, which helps to improve the compactness of the arc extinguishing chamber and the entire circuit breaker structure, and can reduce arc extinguishing. The volume of the chamber and the circuit breaker.

Further, the conductive connection end of the static side resistance contact and the conductive connection end of the static contact are both ends of the closing resistor on the static side that are close to the static support.

Its beneficial effect is: the above-mentioned structural setting can make the conductive connection end of the static side resistance contact and the conductive connection end of the static contact be arranged close to the static support, so as to realize the connection between the static side closing resistor and the static support and the static side resistance contact seat respectively. fixed connection between.

Further, in the moving direction of the moving contact, the static side closing resistor is set on the side of the static support facing away from the main fracture, and the end of the static side closing resistor close to the static support is fixed on the static support, far away from the static support. One end of the seat is fixed on the static side resistance contact seat through the static side insulator.

Its beneficial effects are: in the above-mentioned structural arrangement, one end of the closing resistor on the static side is fixed on the static support at both ends of the moving direction of the moving contact, and the other end is fixed on the resistance contact seat on the static side, which helps to improve the arc extinguishing chamber. Structural stability of the closing resistor on the neutral side.

Further, the moving-side resistance contact seat is fixed on the moving support through the moving-side insulator, and the static-side resistance contact seat is fixed on the static support through the static-side insulator, and the moving-side insulator and the static-side insulator At least one is fixed between the dynamic support and the static support.

Its beneficial effect is: since the main fracture requires a large installation space in the moving direction of the moving contact, the above-mentioned structural arrangement can make full use of the space between the moving support and the static support, which helps to increase the structure of the arc extinguishing chamber and the circuit breaker. The compactness can reduce the size of the arc extinguishing chamber and the circuit breaker in the moving direction of the moving contact.

Description of drawings

Fig. 1 is a simplified schematic structural view of the circuit breaker in Embodiment 1 of the circuit breaker of the present invention;

Fig. 2 is a simplified structural schematic diagram of the arc extinguishing chamber in the specific embodiment 1 of the circuit breaker of the present invention;

Fig. 3 is a schematic structural view of the arc extinguishing chamber in Embodiment 1 of the circuit breaker of the present invention;

Fig. 4 is a schematic diagram of the structure at A in Fig. 2;

Fig. 5 is a schematic diagram of the partial structure of the arc extinguishing chamber in Embodiment 1 of the circuit breaker of the present invention;

Fig. 6 is a schematic structural view of the moving side resistance contact, the moving side resistance contact seat and the moving side insulating rod in the specific embodiment 1 of the circuit breaker of the present invention;

Fig. 7 is a schematic structural view of the moving side resistance contact seat in the specific embodiment 1 of the circuit breaker of the present invention;

Fig. 8 is a structural schematic diagram of the static side resistance contact, the static side resistance contact seat, the static side insulating rod and the end cover in the specific embodiment 1 of the circuit breaker of the present invention;

Fig. 9 is a schematic structural view of the static side resistance contact seat in the specific embodiment 1 of the circuit breaker of the present invention;

In the figure: 1-circuit breaker housing, 2-operating mechanism, 3-interrupter chamber, 4-moving contact, 5-moving side resistance contact, 6-static side resistance contact, 7-resistance fracture, 8 -main fracture, 9-moving side closing resistor, 10-static side closing resistor, 11-moving contact rod, 12-moving side resistance contact rod, 13-transmission box, 14-insulation support cylinder, 15-transmission Connecting plate, 16-connecting rod, 17-transmission rod, 18-moving support, 19-guide shaft, 21-static support, 22-static resistance contact rod, 23-insulation rod, 25-outlet end, 26 -High voltage inlet terminal, 27-resistance contact seat on moving side, 28-resistance contact seat on static side, 29-end cover, 30-spring, 31-connecting boss on moving side, 32-insulating rod on moving side, 33-static side Connecting boss, 34- static side insulating rod, 35- moving side conductive plate, 36- moving side conductive boss, 37- moving side insulating piece, 38- static side conductive plate, 39- static side conductive boss, 40- Static side insulation.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention, that is, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that relative terms such as the terms "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or order exists between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The characteristics and performance of the present invention will be described in further detail below in conjunction with the examples.

Specific embodiment 1 of the circuit breaker of the present invention:

As shown in Fig. 1 to Fig. 3, the circuit breaker includes a circuit breaker housing 1, inside which is provided an operating mechanism 2 and an arc extinguishing chamber 3, the arc extinguishing chamber 3 has a slender structure as a whole, and the arc extinguishing chamber 3 It includes the opening and closing main circuit and the opening and closing resistance branch extending along its length direction. The opening and closing main circuit and the opening and closing resistance branch are arranged in parallel. The main fracture 8 is formed between the moving contact 4 and the static contact. The moving contact 4 can move back and forth in the length direction of the arc extinguishing chamber. The opening and closing resistance branch is equipped with a moving resistance contact 5 and a static resistance The contact 6 and the moving-side resistance contact 5 can reciprocate in the length direction of the arc extinguishing chamber, and a resistance fracture 7 is formed between the movement-side resistance contact 5 and the static-side resistance contact 6, and the resistance fracture 7 and the main fracture 8 are extinguished The arc chamber 3 is arranged side by side in the width direction, and a closing electric group is also provided on the opening and closing resistance branch. The closing resistance includes a moving side closing resistance 9 and a static side closing resistance 10. On the opening and closing resistance branch, The moving side closing resistor 9 is conductively connected between the moving contact 4 and the moving side resistance contact 5, the static side closing resistor 10 is conductively connected between the static contact and the static side resistance contact 6, and the moving side closing resistance 9 and the moving side resistance contact 5 are located on the same side of the resistance break 7, and the static side closing resistor 10 and the static side resistance contact 6 are located on the same side of the resistance break 7, so that the closing resistance on both sides has a voltage dividing effect, When the resistance fracture 7 takes precedence over the main fracture 8 to close, the moving-side closing resistor 9 and the static-side closing resistor 10 each share a part of the voltage, so as to reduce the pressure difference between the position of the resistor port and the charged static contact, thereby Reducing the requirement for the insulation distance between the main fracture 8 and the resistance fracture 7 helps to improve the compactness of the structure of the arc extinguishing chamber 3 and the entire circuit breaker, reduces the size of the arc extinguishing chamber 3 in its width direction, and reduces the arc extinguishing The volume of the chamber 3 and the entire circuit breaker can reduce the amount of sulfur hexafluoride used in the circuit breaker housing 1 .

In this embodiment, as shown in Figures 1 to 4, a moving contact rod 11 is connected to the moving contact 4, the arc extinguishing chamber 3 includes a transmission mechanism connected to the moving contact rod 11, and the moving side resistance contact 5 is The moving side resistance contact rod 12 is connected, the transmission mechanism is connected with the moving side resistance contact rod 12, and the transmission mechanism is connected with the output shaft of the operating mechanism 2, so as to drive the moving side resistance contact 5 through the operating mechanism 2 and the transmission mechanism The moving contact 4 reciprocates along the length direction of the arc extinguishing chamber 3 to realize opening and closing of the main fracture 8 and the resistance fracture 7 . Specifically, the transmission mechanism includes a transmission box 13, which is fixedly connected to the circuit breaker housing 1 through an insulating support cylinder 14. The transmission mechanism also includes a transmission connecting plate 15, which is located in the transmission box 13, and the transmission connecting plate 15 A connecting rod 16 is hinged on the top, and the connecting rod 16 passes through the transmission box 13 and is connected to the output shaft of the operating mechanism 2. The transmission connecting plate 15 is also connected to the moving contact 4 and the moving side resistance contact 5 respectively. The plate 15 is directly hinged with the end of the moving contact rod 11 , and the two hinge shafts on the transmission connecting plate 15 respectively hinged with the connecting rod 16 and the end of the moving contact rod are arranged at intervals in the length direction of the arc extinguishing chamber 3 . The transmission mechanism also includes a transmission rod 17 connected between the transmission connecting plate 15 and the moving side resistance contact rod 12, one end of the transmission rod 17 is hinged with the transmission connecting plate 15, and its hinge shaft is connected to the connecting rod at the transmission connecting plate 15 respectively. 16 and the side of the straight line where two hinge shafts are hinged at the end of the moving contact rod, the other end of the transmission rod 17 is hinged with the end of the moving side resistance contact rod 12.

In this embodiment, as shown in Figures 1 to 3, a moving support 18 is connected to the side of the transmission box 13 away from the insulating support cylinder, and the moving contact rod 11 and the moving side resistance contact rod 12 both pass through the moving support 18, there is also a guide shaft 19 inside the transmission case 13, the guide shaft 19 extends along the length direction of the arc extinguishing chamber 3, one end of the guide shaft 19 is fixed on the box wall of the transmission case 13, and the other end is fixed on the movable support 18 On the top, the transmission connecting plate 15 is guided and mounted on the guide shaft 19, so that when the operating mechanism 2 operates, the transmission connecting plate 15 moves along the length direction of the arc extinguishing chamber 3, and then drives the moving contact 4 and the moving side resistance contact. 5 act at the same time to ensure the synchronization of the action of the moving contact 4 and the moving side resistance contact 5.

In this embodiment, as shown in Fig. 2, Fig. 3 and Fig. 5, the movable support 18 is respectively provided with the perforation of the moving contact rod and the perforation of the moving side resistance contact rod, on the side of the moving support 18 facing away from the transmission box There is a static support 21, the static side resistance contact 6 is connected with the static side resistance contact rod 22, the static support 21 is used to fix the static side resistance contact rod 22, the dynamic side resistance contact 5 and the static side resistance contact The head 6 is located between the movable support 18 and the static support 21, so that the main fracture 8 and the resistance fracture 7 are both located between the dynamic support 18 and the static support 21, and in the width direction of the arc extinguishing chamber, the main fracture 8 Arranged side by side with the resistance break to reduce the distance between the resistance port and the main break 8 in the width direction of the arc extinguishing chamber 3, which helps to reduce the size of the arc extinguishing chamber 3 and the circuit breaker in the width direction of the arc extinguishing chamber .

The moving contact is conductively arranged on the moving support, and the static contact is conductively arranged on the static support. The static side resistance contact is equipped with a static side resistance contact seat, and the static side resistance contact seat is installed in the static support. The static support is insulated and fixedly connected, and the moving side resistance contact is equipped with a moving side resistance contact seat. Located between the static support and the dynamic support.

As shown in Fig. 2, Fig. 3 and Fig. 5, the outer contours of the movable support 18 and the static support 21 are cylindrical, and the movable support 18 is provided with an insulating rod 23 for supporting the static support 21, and the insulating rod 23 Arranged at intervals along the circumferential direction of the moving support 18, the moving support 18 is provided with a notch facing the moving support of the static support 21, and the static support 21 is provided with a static support with the notch facing the moving support 18 The two ends of the insulating rod 23 are respectively connected to the bottom of the groove of the movable support and the bottom of the groove of the static support. The side wall of the groove has a shielding effect on the main fracture 8 and the resistance fracture 7, which helps to improve the insulation reliability of the arc extinguishing chamber 3 and the entire circuit breaker.

In this embodiment, as shown in Figures 1 to 3, the movable contact 4 is fixed on the movable support 18 through the movable contact seat, the movable contact seat and the movable support 18 are conductively and fixedly connected, and the movable support 18 is provided with an outgoing line Terminal 25, the moving contact seat is conductively slidably connected with the moving contact rod 11 through the contact fingers, the static contact is fixed on the static support 21 through the static contact seat, the static contact seat is electrically and fixedly connected with the static contact through the contact fingers, and the static support The seat 21 is provided with a high-voltage incoming line terminal 26. Under the action of the operating mechanism 2 and the transmission mechanism, the moving contact rod 11 moves back and forth in the moving contact seat to realize the opening and closing operation of the circuit breaker.

In this embodiment, as shown in Fig. 2, Fig. 3 and Fig. 5, the moving side resistance contact rod 12 is equipped with a moving side resistance contact seat 27, the moving side resistance contact seat 27 is a cylindrical structure, and the moving side resistance contact The rod 12 slides and fits in the moving side resistance contact seat 27, and the moving side resistance contact seat 27 is worn in the hole of the moving side resistance contact rod, and the moving side resistance contact seat 27 connects with the moving side resistance contact rod 12 through the contact finger. Conductive connection. The static side resistance contact rod 22 is equipped with a static side resistance contact seat 28, the static side resistance contact rod perforation is arranged on the static side support 21, and the static side resistance contact seat 28 is worn in the static side resistance contact rod perforation, and the static side The side resistance contact seat 28 is a cylindrical structure. In the length direction of the arc extinguishing chamber, the end of the static side resistance contact seat 28 away from the moving side resistance contact 5 is provided with an end cover 29, and the static side resistance contact seat 28 is provided with a There is a spring 30, the static side resistance contact rod 22 is guided and inserted in the static side resistance contact seat 28, and is electrically connected with the static side resistance contact seat 28 through the contact fingers, under the driving action of the operating mechanism 2 and the transmission mechanism, The moving side resistance contact rod 12 can guide and move in the moving side resistance contact seat 27 to realize the opening and closing of the resistance fracture 7 in the opening and closing resistance branch circuit, and the setting of the spring 30 in the static side resistance contact seat 28 can make the opening and closing In the closing resistance branch, the resistance break 7 has priority to the main break 8 to open and close the main break 8, which can effectively avoid the occurrence of operation overvoltage in the power system.

In this embodiment, as shown in FIGS. 5 to 9 , the end of the moving-side resistance contact seat 27 facing the static-side resistance contact 6 is provided with a moving-side connecting boss 31 , and there are two moving-side connecting bosses 31 . And it is arranged in the radial direction of the moving side resistance contact seat 27, and each moving side connecting boss 31 is connected with the moving support 18 through a moving side insulator, and the moving side insulator is a moving side insulating rod 32, so as to ensure that the moving side resistance contact seat 27 is insulated from the moving support 18, the moving side insulating rod 32 is arranged in the horizontal direction, and the moving side insulating rod 32 is connected to the groove bottom of the moving support 18, so that the moving side insulating rod 32 is located on the moving support 18 and the static support 21, since the main fracture requires a large installation space in the length direction of the arc extinguishing chamber, the above-mentioned structural arrangement can make full use of the space between the dynamic support 18 and the static support 21, which can reduce the dynamic The movement stroke of the side resistance contact 5 helps to increase the compactness of the structure of the arc extinguishing chamber 3 and the circuit breaker, and can reduce the size of the arc extinguishing chamber 3 and the circuit breaker in the length direction of the arc extinguishing chamber. The end of the static side resistance contact seat 28 facing away from the moving side resistance contact 5 is provided with a static side connection boss 33, and there are two static side connection bosses 33, and the two static side connection bosses 33 are on the static side resistance contact. The included angle between the circumferential directions of the seat 28 is less than 180°, each static side connection boss 33 is connected to the static support 21 through a static side insulator, and the static side insulator is a static side insulating rod 34, as shown in Figure 1, the static side The insulating rod 34 is connected to the side of the static support 21 facing away from the moving support, so as to reserve a stroke space for the reciprocating movement of the resistance contact 5 on the moving side between the moving support 18 and the static support 21. The connecting boss 33 is arranged downwards, and the two insulating rods 34 on the static side are also arranged obliquely downwards.

In this embodiment, as shown in Figure 2 and Figure 3, there are two groups of moving side closing resistors 9, and the two groups of moving side closing resistors 9 are located on the side of the moving support 18 facing away from the static The length direction of the arc chamber 3 is extended and arranged, and the moving side closing resistors 9 arranged in groups are arranged in parallel at intervals in the width direction of the arc extinguishing chamber 3 to form a power supply side resistance between the two moving side closing resistors 9 The active space for the reciprocating movement of the contact rod 12 in the length direction of the arc extinguishing chamber. The two ends of the two sets of moving-side closing resistors 9 away from the moving support 18 are connected through the moving-side conductive plate 35, so that the moving-side closing resistors form a U-shaped structure, and the two moving-side closing resistors 9 are close to the moving support 18 Among the two ends, one end is the moving contact conductive connection end for conductive connection with the moving contact 4, and the other end is the moving side resistance contact for conducting connection with the moving side resistance contact Conductive connection end, the conductive connection end of the moving contact is conductively and fixedly connected to the end of the moving support 18 facing away from the static support 21 through conductive parts and bolts, and the conductive connection end of the moving side resistance contact is connected to the moving side through a conductive plate and bolts. The resistance contact seat 27 is conductively and fixedly connected. Specifically, the outer wall of the other end of the moving-side resistance contact seat 27 is provided with a moving-side conductive boss 36, and the conductive connection end of the moving-side resistance contact is fixed on the moving-side conductive boss 36 through a conductive plate and bolts to realize a moving The conductive connection between the side closing resistor 9 and the moving side resistance contact seat 27 and the moving support 18.

In this embodiment, as shown in Figure 1, Figure 2 and Figure 3, the moving side closing resistor 9 is arranged side by side with the transmission box 13 in the width direction of the arc extinguishing chamber, and in the orientation shown in Figure 2, the moving side The side closing resistor 9 is located on the lower side of the transmission box 13 to reduce the installation space of the arc extinguishing chamber 3 occupied by the moving side closing resistor 9 in the length direction of the arc extinguishing chamber 3, which helps to reduce the size of the arc extinguishing chamber 3 and the circuit breaker. Dimensions in the radial direction of the arc extinguishing chamber 3. The moving-side insulating part 37 is connected to the moving-side conductive plate 35, and the moving-side insulating part 37 is fixed on the transmission case 13 by bolts, so that the moving-side closing resistor 9 is hoisted on the outer side wall of the transmission case 13 through the moving-side insulating part 37 Above, increase the structural stability of the closing resistor 9 on the moving side, the arc extinguishing chamber 3, and the circuit breaker.

In this embodiment, as shown in Figure 3, there are two sets of closing resistors 10 on the static side. The arrangement is extended in the length direction, and the static side closing resistors 10 arranged in groups are arranged in parallel at intervals in the width direction of the arc extinguishing chamber 3 . The two ends of the two sets of static side closing resistors 10 away from the static support 21 are connected through the static side conductive plate 38, so that the static side closing resistors form a U-shaped structure, and the two static side closing resistors 10 are close to the static support 21 Of the two ends, one end is the static contact conductive connection end for conductive connection with the static contact, and the other end is the static side resistance contact conductive connection for the static side resistance contact. Connecting end, the conductive connecting end of the static contact is electrically and fixedly connected to the end of the static support 21 facing away from the moving support 18 through conductive parts and bolts, and the conductive connecting end of the static side resistance contact is connected to the static side resistance through a conductive plate and bolts. The contact seat 28 is electrically and fixedly connected. Specifically, the outer wall of the static-side resistance contact seat 28 is provided with a static-side conductive boss 39, and the conductive connection end of the static-side resistance contact is fixed on the static-side conductive boss 39 through a conductive plate and bolts, so as to realize static-side closing. The gate resistor 10 is electrically connected to the static side resistance contact seat 28 and the static support 21 .

In this embodiment, as shown in Fig. 2, Fig. 3 and Fig. 5, since the resistance contact seat 28 on the static side protrudes away from the moving support in the length direction of the arc extinguishing chamber 3, the resistance contact seat 28 on the static side The end cover 29 hangs out of the static support 21. In the orientation shown in FIG. The conductive plate 38 and the end cover 29 are connected by a static-side insulator 40, which is a cylindrical insulating tube, and the static-side insulator 40 is arranged in parallel with the static-side closing resistor 10. A connection insert is installed, and the connection insert facing the end of the end cover 29 of the static-side insulator 40 is a stud, and the static-side insulator 40 is fixed on the end cover 20 through the stud. Correspondingly, the static-side insulator 40 The connecting insert at the end of the end cover 29 is a conductive insert, and the conductive insert is provided with a threaded hole, and the conductive insert is fixedly connected to the static side conductive plate 38 by bolts, so that the static side insulator 40 passes through The conductive insert is connected to the static side conductive plate 38, and the static side closing resistor 10 is supported on the end cover 29 through the static side insulator 40, so as to increase the static side closing resistance and the structural stability of the arc extinguishing chamber 3 and the circuit breaker .

In this embodiment, as shown in Figures 1 and 3, since the two static-side connecting bosses 33 are arranged downwardly, the two static-side insulating rods 34 are also arranged obliquely downward, which can increase the connection between the static-side insulating rods 34 and the The distance between the bolts at the ends of the closing resistor 10 on the static side ensures the insulation between the closing resistor 10 on the static side and the insulating plate 34 on the static side.

Specific embodiment 2 of the circuit breaker of the present invention:

The difference between it and the specific embodiment 1 is that the movable support is only provided with a perforation for passing through the movable contact rod, so that the main fracture is located between the movable support and the static support, so that the grooves on the movable support can The groove side wall and the groove side wall slotted on the static support have a shielding effect on the main fracture.

The resistance contact seat on the moving side is insulated and fixedly connected to the moving support through the insulating connector on the moving side arranged on the radially outer side of the moving support, and the resistance contact seat on the static side is connected to the static side through the insulating connector on the static side arranged on the radially outer side of the static support. The support is insulated and fixedly connected, and the resistance fracture is set on the radially outer side of the moving support, and is correspondingly arranged between the moving support and the static support, but the groove side wall of the moving support and the slot on the static support The side wall of the groove has no shielding effect on the resistance fracture.

This structural setting in this embodiment can reduce the radial size of the movable support and the static support, so as to reduce the distance between the resistance fracture and the main fracture, and reduce the diameter of the arc extinguishing chamber and the circuit breaker in the arc extinguishing chamber. Dimensions up.

Specific embodiment 3 of the circuit breaker of the present invention:

The difference between it and the specific embodiment 1 is that there is a set of closing resistors on the moving side and closing resistors on the static side, and they are arranged along the length direction of the arc extinguishing chamber. The end of the closing resistor on the moving side away from the moving support is The conductive connection end of the moving side resistance contact, the conductive connection end of the moving side resistance contact is fixed on the moving side resistance contact seat through the moving side conductive part, and the end of the moving side closing resistance close to the moving support is the conductive connection of the moving contact The conductive connection end of the moving contact is fixed on the end surface of the moving support facing away from the static support through bolts. The end of the moving side closing resistor away from the moving support is hoisted on the outer wall of the transmission box through the moving side insulator to increase the structural stability of the moving side closing resistor, arc extinguishing chamber and circuit breaker.

The end of the static side closing resistor away from the static contact is the conductive connection end of the static side resistance contact. The conductive connection end of the static side resistance contact is fixed on the static side resistance contact seat through the static side conductive parts. The end near the static support is the conductive connection end of the static contact, and the conductive connection end of the static contact is fixed on the end surface of the static support facing away from the dynamic support by bolts. The end of the static side closing resistor away from the static support is supported on the end cover of the static side resistance contact seat through the static side insulator, so as to increase the structural stability of the static side closing resistor, arc extinguishing chamber and circuit breaker.

In this embodiment, the closing resistance structure of the above structural arrangement can also reduce the voltage difference between the resistance break and the static contact when the resistance break is closed, and reduce the distance between the resistance break and the main break that meets the insulation requirements , helps to reduce the size of the arc extinguishing chamber and circuit breaker in the length direction of the arc extinguishing chamber, reduces the volume of the arc extinguishing chamber and circuit breaker, and can also reduce the use of sulfur hexafluoride gas in the arc extinguishing chamber .

In other embodiments, the number of groups of the moving-side closing resistors and the static-side closing resistors can also be three or four groups, and the closing resistors on the corresponding sides are connected in series, and the moving-side closing resistors arranged in series and arranged in groups The two ends are respectively connected to the moving support and the moving side resistance contact seat, and the two ends of the static side closing resistors arranged in series and arranged in groups are respectively connected to the static support and the static side resistance contact seat to reduce the size of the arc extinguishing chamber. The installation space occupied by the closing resistor in the length direction of the arc extinguishing chamber helps to reduce the size of the arc extinguishing chamber and the circuit breaker in the length direction of the arc extinguishing chamber.

In other embodiments, the number of groups of the moving-side closing resistors and the static-side closing resistors is different. For example, one set of moving-side closing resistors and two sets of static-side closing resistors can be set, or only one set of static-side closing resistors can be set, and two or three sets of moving-side closing resistors can be set.

Specific embodiment 4 of the circuit breaker of the present invention:

The difference from the specific embodiment 1 is that in the length direction of the arc extinguishing chamber, the closing resistor on the moving side is arranged side by side with the transmission mechanism, the connecting rod is an insulating rod, and the connecting rod passes through the closing resistor on the moving side. The arc extinguishing chamber and the circuit breaker form a slender structure, which meets the installation and use of the circuit breaker in a special demand space.

Specific embodiment 5 of the circuit breaker of the present invention:

The difference between it and the specific embodiment 1 is that: in the orientation shown in Figure 2, the main fracture is located on the lower side of the resistor port, and the closing resistor on the moving side is located on the upper side of the transmission box, and the closing resistor on the static side is located on the static side resistor. The lower side of the contact seat, so that the moving side closing resistor is supported on the box wall of the transmission box through the moving side insulator, and the static side closing resistor is hoisted on the static side resistance contact seat through the static side insulating piece to improve the dynamic side. Structural stability of closing resistors and static side closing resistors.

In other embodiments, it is also possible that the closing resistor on the static side is located on the upper side of the resistance contact seat on the static side, and the closing resistor on the moving side is located on the upper side of the transmission box, so that the closing resistor on the static side is supported on the end by the insulating piece on the static side. On the cover, the moving side closing resistor is supported on the box wall of the transmission box through the moving side insulator.

In other embodiments, it is also possible that the closing resistor on the static side is located on the lower side of the resistance contact seat on the static side, and the closing resistor on the moving side is located on the lower side of the transmission box, so that the closing resistor on the static side is hoisted on the terminal side through the insulating piece on the static side. On the cover, the moving side closing resistor is hoisted on the box wall of the transmission box through the moving side insulator.

Specific embodiment 6 of the circuit breaker of the present invention:

The difference from the specific embodiment 1 is that the moving side resistance contact seat is fixed on the end surface of the moving support facing away from the static support through the moving side insulating rod, so that the moving side insulating rod is located on the side of the moving support away from the static support The resistance contact seat on the static side is fixed on the end surface of the static support facing the moving support through the insulating rod on the static side, so that the insulating rod on the static side is located between the static support and the moving support. This structure can also reduce the The dimension of the small interrupter in its length direction.

Specific embodiment 7 of the circuit breaker of the present invention:

The difference between it and the specific embodiment 1 is that the moving side resistance contact seat is fixed on the end face of the moving support facing the static support through the moving side insulating rod, and the static side resistance contact seat is fixed on the end surface of the static support through the static side insulating rod. The end face facing the moving support, so that both the moving side insulating rod and the static side insulating rod are located between the static support and the moving support, which helps to increase the compactness of the structure of the arc extinguishing chamber and reduce the Dimensions in the length direction.

Specific embodiment 8 of the circuit breaker of the present invention:

The difference between it and the specific embodiment 1 is that there are three sets of moving-side closing resistors, and the three sets of moving-side closing resistors are connected in series so that the moving-side closing resistors form a Z-shaped structure, and the moving-side closing resistors of the moving-side The conductive connection end of the resistance contact is set away from the moving support, and is conductively and fixedly connected to the moving side resistance contact seat through the moving side conductive part, and the conductive connection end of the moving contact is set close to the moving support, and is conductively and fixedly connected to the moving support through bolts .

There are three groups of corresponding closing resistors on the static side, and the three groups of closing resistors on the static side are connected in series end to end, so that the closing resistors on the static side form a Z-shaped structure, and the conductive connection ends of the static side resistance contacts of the closing resistors on the static side are far away from the static side. The support is provided, and is conductively and fixedly connected to the static side resistance contact seat through the static side conductive part, and the conductive connection end of the static contact is set close to the static support, and is conductively and fixedly connected to the static support through bolts.

The specific embodiment of the arc extinguishing chamber of the present invention:

The structure of the arc extinguishing chamber in the present invention is the same as the structure of the arc extinguishing chamber in Embodiment 1 to Embodiment 8 of the circuit breaker above, and will not be repeated here.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. The scope of patent protection of the present invention is subject to the claims. Any equivalent structural changes made by using the description and accompanying drawings of the present invention, All should be included in the protection scope of the present invention in the same way.

Claims (8)

1. An arc chute, comprising: the switching-on and switching-off main circuit comprises a moving contact and a static contact, and the moving contact and the static contact form a main fracture; the opening and closing resistance branch circuit is arranged in parallel with the opening and closing main circuit and comprises a closing resistance, a movable side resistance contact and a static side resistance contact, and the movable side resistance contact and the static side resistance contact form a resistance fracture; the transmission mechanism is in transmission connection with the operating mechanism to drive the moving contact and the moving side resistance contact so as to realize the closing and the opening of the main fracture and the resistance fracture; the dynamic side switching-on resistor is conductively connected between the dynamic contact and a dynamic side resistor contact, and the static side switching-on resistor is conductively connected between the static contact and a static side resistor contact; the arc extinguish chamber further comprises a movable support and a static support, the static support and the movable support are fixed in a breaker shell, the movable contact is arranged on the movable support in a conductive mode, the static contact is arranged on the static support in a conductive mode, the static side resistance contact is arranged on the static support in a penetrating mode, the static side resistance contact is provided with a static side resistance contact seat, the static side resistance contact seat is fixedly connected with the static support in an insulating mode, the movable side resistance contact is arranged on the movable support in a penetrating mode, the movable side resistance contact is provided with a movable side resistance contact seat, and the movable side resistance contact seat is fixedly connected with the movable support in an insulating mode so that the main fracture and the resistance fracture are located between the static support and the movable support; the moving side closing resistor and the static side closing resistor are arranged in an extending mode in the moving direction of the moving contact; the movable side closing resistors are arranged in groups, the movable side closing resistors which are arranged in groups are arranged in parallel in the direction perpendicular to the moving direction of the movable contact, the movable side closing resistors which are arranged in groups are connected in series, the movable contact conductive connecting end which is connected with the movable contact in a conductive mode on the movable side closing resistors which are connected in series is fixedly connected with the movable support in a conductive mode, and the movable side resistance contact conductive connecting end which is connected with the movable side resistance contact in a conductive mode on the movable side closing resistors which are connected in series is fixedly connected with the movable side resistance contact seat in a conductive mode; and/or quiet side closing resistance is provided with at least two sets ofly, and the quiet side closing resistance who arranges in groups arranges in parallel in the direction that the perpendicular to moving contact removed, and the quiet side closing resistance who arranges in groups establishes ties, and the static contact conductive connection end and the electrically conductive fixed connection of quiet support of electrically conductive connection with the static contact on the quiet side closing resistance who establishes ties, and the quiet side resistance contact conductive connection end and the electrically conductive fixed connection of quiet side resistance contact seat of electrically conductive connection with quiet side resistance contact on the quiet side closing resistance who establishes ties.

2. The arc extinguish chamber according to claim 1, wherein the movable side resistor contact conductive connecting end and the movable contact conductive connecting end are both arranged at one end of the movable side closing resistor close to the movable support.

3. The arc extinguish chamber according to claim 1 or 2, wherein in the moving direction of the movable contact, the movable side closing resistor is arranged on one side of the movable support, which faces away from the main fracture, one end of the movable side closing resistor, which is close to the movable support, is fixed on the movable support, and the other end, which is far away from the movable support, is fixed on the transmission mechanism through the movable side insulating part.

4. The arc extinguish chamber according to claim 3, wherein the moving side resistance contact is configured with a moving side resistance contact rod, the moving side resistance contact rod is arranged to extend along the moving direction of the movable contact, and two groups of the moving side closing resistors arranged in groups are arranged at intervals in a direction perpendicular to the moving direction of the movable contact to form a moving space for the moving side resistance contact rod to move back and forth in the moving direction of the movable contact.

5. The arc extinguish chamber according to claim 1, wherein the static side resistance contact conductive connecting end and the static contact conductive connecting end are both arranged at one end of the static side closing resistor close to the static support.

6. The arc extinguish chamber according to claim 1 or 5, wherein in the moving direction of the movable contact, the static side closing resistor is arranged on one side, facing away from the main fracture, of the static support, one end, close to the static support, of the static side closing resistor is fixed on the static support, and the other end, far away from the static support, of the static side closing resistor is fixed on the static side resistor contact seat through the static side insulating part.

7. The arc extinguish chamber according to claim 1, wherein the dynamic side electric resistance contact base is fixed on the dynamic support base through a dynamic side insulator, the static side electric resistance contact base is fixed on the static support base through a static side insulator, and at least one of the dynamic side insulator and the static side insulator is fixed between the dynamic support base and the static support base.

8. A circuit breaker, including the circuit breaker casing, be equipped with operating mechanism and explosion chamber in the circuit breaker casing, operating mechanism and explosion chamber transmission connection, characterized in that, explosion chamber be any one in claims 1 to 7 the explosion chamber.

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