Primary and secondary fusion outdoor high-voltage vacuum circuit breaker with isolating switch

Abstract

The utility model relates to a primary and secondary fusion outdoor high-voltage vacuum circuit breaker with an isolating switch, which belongs to the technical field of circuit breakers, and comprises a box body, a first sleeve is arranged on one side of the box body, a second sleeve is arranged on the other side of the box body, a solid-sealed polar pole is arranged in the box body, and a first conductor connected with the first sleeve is arranged at one end of the solid-sealed polar pole; a vacuum arc-extinguishing chamber and an isolation knife are arranged in the solid-sealed polar pole, a static conducting rod of the vacuum arc-extinguishing chamber is connected with a third conductor, a movable conducting rod of the vacuum arc-extinguishing chamber is connected with the first conductor, an isolation operation shaft is arranged on the isolation knife, and two ends of the isolation knife are respectively a first contact end and a second contact end. The isolation operation shaft can drive the isolation knife to realize conversion between the first position and the second position. The built-in isolation knife is adopted, the requirement for safe isolation during maintenance is met, and compared with a split combination structure of an isolation switch and a circuit breaker, the overall structure is more compact, and miniaturization of the circuit breaker is facilitated.

Description

Technical Field

[0001] The present application relates to the field of circuit breakers, and in particular to a primary-secondary fusion outdoor high-voltage vacuum circuit breaker with an isolating switch. Background Art

[0002] The recent emergence of outdoor vacuum high-voltage switches has successfully applied to power systems due to their simple structure, minimal components, high reliability, precision, and long service life. Currently, the structure of outdoor vacuum high-voltage switches is diversifying, and the disclosure of numerous patents has promoted the continuous improvement of outdoor vacuum high-voltage switch technology. Although these patented technologies are relatively advanced, they are relatively complex in manufacturing and assembly, especially in the isolation switch area, which has become a major problem in current products. The large design wastes raw materials and is cumbersome and labor-intensive. The exposed live parts pose a significant safety hazard to line operations. Long-term exposure to rain, ultraviolet rays, and air corrosion can cause frequent jamming during operation, which can easily endanger the safety of operators.

[0003] At present, the main method in China is to install the outdoor high-voltage switch outside the housing separately and use it separately from the outdoor high-voltage switch. First, this method requires a large space, which is not conducive to miniaturization. Second, once a fault or damage occurs, the isolation knife assembly needs to be replaced, resulting in errors in subsequent coordination, unreliable disconnection and chain failure, causing insecurity for equipment and personnel. In addition, the accuracy of the existing technology is unstable, and inflexible operation often occurs. Utility Model Content

[0004] In order to meet the requirements of safety isolation during maintenance and facilitate the miniaturization of the overall structure, the present application provides a primary-secondary integrated outdoor high-voltage vacuum circuit breaker with an isolating switch.

[0005] This application provides an outdoor high-voltage vacuum circuit breaker with a primary and secondary fusion and an isolating switch, which adopts the following technical solutions:

[0006] A primary-secondary integrated outdoor high-voltage vacuum circuit breaker with a disconnector, comprising a housing, a first bushing provided on one side of the housing, a second bushing provided on the other side, a sealed pole provided in the housing, a first conductor for connecting to the first bushing provided at one end of the sealed pole, and a second conductor for connecting to the second bushing provided at the other end, a vacuum interrupter and an isolating knife provided in the sealed pole, a static conductive rod of the vacuum interrupter connected to a third conductor, a dynamic conductive rod of the vacuum interrupter connected to the first conductor, an isolating knife provided with an isolating operating shaft, a first contact end and a second contact end respectively at each end of the isolating knife, and the isolating operating shaft capable of driving the isolating knife to achieve a transition between a first position and a second position;

[0007] When the isolation knife is in the first position, the first contact end is connected to the third conductor, and the second contact end is connected to the second conductor;

[0008] When the isolation blade is in the second position, a first break is formed between the first contact end and the third conductor, and a second break is formed between the second contact end and the second conductor.

[0009] Optionally, a first chamber for accommodating an isolation blade is provided in the sealed pole.

[0010] Optionally, a second chamber is provided in the sealed pole, a flexible connection is provided in the second chamber, one end of the flexible connection is connected to the first conductor, and the other end is connected to the movable conductive rod of the vacuum interrupter.

[0011] Optionally, a current transformer is provided in the sealed pole, and the current transformer is provided outside the first conductor.

[0012] Optionally, a capacitor is provided in the first sleeve and the second sleeve, and the capacitor is connected to a lead wire, which can be plugged and unplugged into an external circuit.

[0013] Optionally, a pull rod is further provided in the second chamber, and the pull rod is connected to the moving conductive rod of the vacuum arc chamber through a soft connection. A transmission mechanism is also provided in the box body, and the transmission mechanism is used to drive the pull rod to move up and down to realize the closing and opening of the circuit breaker.

[0014] In summary, this application includes at least one of the following beneficial technical effects:

[0015] 1. The present application adopts a built-in isolating knife, which meets the requirements of safe isolation during maintenance. Compared with the existing split combination structure of the isolating switch and the circuit breaker, on the one hand, the present application sets the isolating knife in the sealed pole, and the overall structure is more compact, which is conducive to the miniaturization of the overall structure of the circuit breaker; on the other hand, the isolating switch does not need to be assembled on site, which reduces the assembly difficulty; in addition, it can reduce the possibility of rust and damage of the isolating knife, thereby improving the problem of poor contact and helping to extend the service life of the circuit breaker.

[0016] 2. The isolating knife of the present application adopts a rotating double-break isolating knife. Compared with the single-break isolating knife, it has a double-sided isolation function and higher isolation reliability, which is conducive to improving the safety of circuit breaker use.

[0017] 3. The present application has its own current transformer. By arranging the current transformer inside the sealed pole, the two form a highly integrated whole, which is beneficial to saving the volume occupied by the current transformer and saving the structural parts required for installing and fixing the current transformer.

[0018] 4. Using built-in capacitors instead of traditional voltage transformers to draw power is beneficial to reducing the size of the circuit breaker and reducing the cost of the circuit breaker. The capacitor-based power supply has higher stability and avoids safety issues such as overcurrent and electromagnetic resonance caused by short circuit on the secondary side of the voltage transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of an outdoor high-voltage vacuum circuit breaker with a primary and secondary fusion and an isolating switch according to an embodiment of the present application.

[0020] Figure 2 It is a cross-sectional view showing the internal structure of the box in the embodiment of the present application.

[0021] Figure 3 It is a structural schematic diagram showing that the isolation knife is in the first position in the embodiment of the present application.

[0022] Figure 4 It is a structural schematic diagram showing that the isolation knife is in the second position in the embodiment of the present application.

[0023] Explanation of the accompanying drawings: 1. Box body; 2. First bushing; 3. Second bushing; 4. Sealed pole; 41. First conductor; 42. Second conductor; 43. Vacuum interrupter; 431. Third conductor; 44. Second chamber; 441. Flexible connection; 45. Pull rod; 46. Current transformer; 47. First chamber; 48. Isolating knife; 481. First contact terminal; 482. Second contact terminal; 483. First break; 484. Second break; 49. Isolating operating shaft; 5. Transmission mechanism; 6. Operating mechanism; 7. Capacitor. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1-4 , further details of this application are given.

[0025] Example:

[0026] The embodiment of the present application discloses a primary-secondary integrated outdoor high-voltage vacuum circuit breaker with an isolating switch.

[0027] Reference Figure 1-2 A primary / secondary integrated outdoor high-voltage vacuum circuit breaker with a disconnector includes a housing 1. A first bushing 2 is detachably connected to one side of the housing 1, and a second bushing 3 is detachably connected to the other side. A sealed pole 4 is mounted within the housing 1. One end of the sealed pole 4 is provided with a first conductor 41 for connection to the first bushing 2, and the other end is provided with a second conductor 42 for connection to the second bushing 3.

[0028] Reference Figure 2-4A vacuum interrupter 43 is provided within the sealed pole 4, which is made of epoxy resin. The sealed pole 4 is integrally cast with the first conductor 41, the second conductor 42, and the vacuum interrupter 43. The sealed pole 4 encloses the vacuum interrupter 43 and partially encloses the first conductor 41 and the second conductor 42.

[0029] Reference Figure 2-4 A second chamber 44 is provided in the sealed pole 4, and a pull rod 45 is placed in the second chamber 44. The pull rod 45 is connected to the movable conductive rod of the vacuum interrupter 43. A transmission mechanism 5 is also provided in the box body 1. The transmission mechanism 5 is used to drive the pull rod 45 up and down to realize the closing and opening of the circuit breaker.

[0030] Reference Figure 2-4 A flexible connection 441 is further provided in the second chamber 44. A pull rod 45 passes through a hole at one end of the flexible connection 441 to securely connect the movable conductive rod of the vacuum interrupter 43. The end of the flexible connection 441, away from the pull rod 45, is securely connected to the first conductor 41. Thus, the flexible connection 441 connects the movable conductive rod of the vacuum interrupter 43 to the first conductor 41, thereby protecting the movable conductive rod of the vacuum interrupter 43 from torsional forces during its vertical movement and thus maintaining its safety.

[0031] Reference Figure 2-4 A current transformer 46 is provided inside the sealed pole 4. The current transformer 46 is provided outside the first conductor 41 and is sealed integrally with the sealed pole 4. Thus, the present application has a built-in current transformer 46. By integrating the current transformer 46 inside the sealed pole 4, the volume occupied by the current transformer 46 is reduced, and the structural components required for mounting and fixing the current transformer 46 are also reduced.

[0032] Reference Figure 1-4 A first chamber 47 is provided in the sealed pole 4, and an isolation knife 48 is installed in the first chamber 47. The two ends of the isolation knife 48 are respectively a first contact end 481 and a second contact end 482. The middle part of the isolation knife 48 is fixedly connected to an isolation operating shaft 49. An operating mechanism 6 is also installed on the box body 1. The operating mechanism 6 is at least a two-position operating mechanism, which can realize the conversion of at least two position states. The operating mechanism 6 is connected to the isolation operating shaft 49. The operating mechanism 6 can operate the isolation operating shaft 49 to rotate, thereby driving the isolation knife 48 to realize the conversion between the first position and the second position. The static conductive rod of the vacuum interrupter 43 is fixedly connected to the third conductor 431 by bolts. The end of the third conductor 431 away from the vacuum interrupter 43 extends into the first chamber 47, and the end of the second conductor 42 close to the first conductor 41 extends into the first chamber 47.

[0033] When the isolating switch 48 is in the first position, the first contact 481 is in electrical contact with the third conductor 431, and the second contact 482 is in electrical contact with the second conductor 42. When the isolating switch 48 is in the second position, a first break 483 is formed between the first contact 481 and the third conductor 431, and a second break 484 is formed between the second contact 482 and the second conductor 42. In this embodiment, the first conductor 41 is the incoming conductor, and the second conductor 42 is the outgoing conductor. Both the first conductor 41 and the second conductor 42 are made of copper rods. The first position is the conducting position of the isolating switch, and the second position is the isolating position of the isolating switch.

[0034] The present application adopts a built-in isolating knife 48, which meets the requirements of safe isolation during maintenance. Compared with the existing split combination structure of the isolating switch and the circuit breaker, on the one hand, the present application sets the isolating knife 48 in the sealed pole 4, and the overall structure is more compact, which is conducive to the miniaturization of the overall structure of the circuit breaker; on the other hand, the isolating switch does not need to be assembled on site, which reduces the difficulty of assembly; in addition, it can reduce the possibility of rust and damage of the isolating knife 48, thereby improving the problem of poor contact and helping to extend the service life of the circuit breaker.

[0035] In addition, the isolating knife 48 of the present application adopts a rotating double-break isolating knife 48, which has a double-sided isolation function compared to the single-break isolating knife 48, and has higher isolation reliability, which is beneficial to improving the safety of circuit breaker use.

[0036] Reference Figure 2 Capacitors 7 are integrally cast inside the first and second bushings 2 and 3. In this example, the first bushing 2 is the incoming line bushing, and the second bushing 3 is the outgoing line bushing. Using built-in capacitors 7 instead of traditional voltage transformers for power draw helps reduce the size and cost of the circuit breaker. Capacitor power draw also offers greater stability and avoids safety issues such as overcurrent and electromagnetic resonance caused by short circuits on the secondary side of the voltage transformer.

[0037] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A primary and secondary fusion outdoor high-voltage vacuum circuit breaker with an isolating switch, characterized by: The invention comprises a box body (1), wherein one side of the box body (1) is provided with a first bushing (2), and the other side is provided with a second bushing (3); a sealed pole (4) is provided in the box body (1); one end of the sealed pole (4) is provided with a first conductor (41) for connecting to the first bushing (2), and the other end is provided with a second conductor (42) for connecting to the second bushing (3); a vacuum arc chamber (43) and an isolating knife (48) are provided in the sealed pole (4); the static conductive rod of the vacuum arc chamber (43) is connected to a third conductor (431), and the dynamic conductive rod of the vacuum arc chamber (43) is connected to the first conductor (41); an isolating operating shaft (49) is provided on the isolating knife (48); the two ends of the isolating knife (48) are respectively a first contact end (481) and a second contact end (482); and the isolating operating shaft (49) can drive the isolating knife (48) to realize the conversion between the first position and the second position; When the isolation knife (48) is in the first position, the first contact end (481) is connected to the third conductor (431), and the second contact end (482) is connected to the second conductor (42); When the isolation knife (48) is in the second position, a first break (483) is formed between the first contact end (481) and the third conductor (431), and a second break (484) is formed between the second contact end (482) and the second conductor (42).

2. The primary and secondary fusion outdoor high-voltage vacuum circuit breaker with disconnector according to claim 1 is characterized in that: A first chamber (47) for accommodating an isolation blade (48) is provided in the sealed pole (4).

3. The primary and secondary fusion outdoor high-voltage vacuum circuit breaker with disconnector according to claim 1 is characterized in that: A second chamber (44) is provided in the sealed pole (4), a flexible connection (441) is provided in the second chamber (44), one end of the flexible connection (441) is connected to the first conductor (41), and the other end is connected to the movable conductive rod of the vacuum interrupter (43).

4. The primary and secondary fusion outdoor high-voltage vacuum circuit breaker with disconnector according to claim 1 is characterized in that: A current transformer (46) is provided in the sealed pole (4), and the current transformer (46) is provided outside the first conductor (41).

5. The primary and secondary fusion outdoor high-voltage vacuum circuit breaker with disconnector according to claim 1 is characterized in that: Capacitors (7) are provided in the first sleeve (2) and the second sleeve (3).

6. The primary and secondary fusion outdoor high-voltage vacuum circuit breaker with disconnector according to claim 3 is characterized in that: A pull rod (45) is also provided in the second chamber (44), and the pull rod (45) is connected to the movable conductive rod of the vacuum arc extinguishing chamber (43) through the soft connection (441). A transmission mechanism (5) is also provided in the box (1), and the transmission mechanism (5) is used to drive the pull rod (45) to move up and down to realize the closing and opening of the circuit breaker.

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