Double-break vacuum circuit breaker and transmission control method thereof

Abstract

The invention relates to a double-break vacuum circuit breaker and a transmission control method thereof. The double-break vacuum circuit breaker comprises three electrical devices which are arranged in a cross beam and correspond to three phases, fifth crank arms which are hinged to opening springs of the electrical devices and hinged to the cross beam, and interphase connecting rods which are hinged to the three fifth crank arms. The cross beam is provided with a three-phase body arranged corresponding to the three electrical equipment, the three-phase body is internally provided with two vacuum arc-extinguishing chambers arranged along the height direction, and the fifth crank arm is synchronously connected with movable side guide rods of the two vacuum arc-extinguishing chambers through an external connecting rod structure. The two vacuum arc extinguish chambers are arranged in the height direction, the current T-shaped arrangement is changed, the fifth connecting lever is driven to act through the mechanism box, and the movable side guide rods of the vacuum arc extinguish chambers are synchronously driven to act while the fifth connecting lever is matched with the opening spring, so that closing and opening can be realized, electric appliance interlocking is replaced by mechanical interlocking, the structure is simplified, and adjustment is convenient.

Description

Technical Field

[0001] The present invention relates to the field of circuit breakers, in particular to the technical field of double-break circuit breakers, and specifically refers to a double-break vacuum circuit breaker and a transmission control method thereof. Background Art

[0002] In the power system, the two most basic and important indicators of power quality are voltage and frequency. Among them, frequency is affected by active power, while voltage can be controlled by reactive power.

[0003] With the large-scale access of new energy, the scale and complexity of the power grid are increasing. In order to ensure the stable, safe, economical operation of the power grid and the requirements of users for high-quality power supply, capacitors are currently used for reactive compensation to improve the power factor, which can not only reduce the active power loss of the power grid, but also reduce the reactive power consumption of the power grid. At the same time, it can also improve the capacity utilization of transformers and power lines and reduce voltage drop. It is a commonly used power-saving measure. Capacitor banks are widely used because of their low price, simple operating equipment and obvious effects. Capacitor banks have a high switching frequency and high reliability requirements. While avoiding inrush current and overvoltage problems, they are prone to damage to capacitors and circuit breakers.

[0004] The existing technology requires the capacitor bank to be switched on and off. The current switching switch device is generally an old-fashioned single-break switch, which is mainly insulated with SF6 or silicone oil. The structure is relatively fixed and lacks flexibility and adjustability. The single-break switch is frequently maintained and has poor environmental protection. The safety redundancy is lower than that of the double-break design. In addition, in the existing switching operation, the insulation rod in the transmission system has poor sealing, which makes it easy for moisture in the environment to enter the device body, affecting the insulation to the ground, and may cause moisture corrosion to the internal components, directly reducing the reliability of the switching operation. How to optimize the design and application of double-break vacuum switches and improve environmental protection and reliability is a technical problem that needs to be solved urgently.

[0005] Most of the existing double-break circuit breakers are T-shaped or open-type, and use electrical interlocking, which is costly, has a complex transmission structure, and is inconvenient to adjust and maintain. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a double-break vacuum circuit breaker and a transmission control method thereof, uses mechanical interlocking instead of electrical interlocking, changes the T-type layout, simplifies the structure, facilitates adjustment and maintenance, and integrates a current transformer, with high integration, space saving and low cost.

[0007] The present invention is achieved through the following technical scheme: a double-break vacuum circuit breaker, comprising three electrical devices arranged in a crossbeam and corresponding to three phases, a fifth crank arm hinged to the electrical device opening spring and hinged to the crossbeam, and an interphase connecting rod hinged to the three fifth crank arms. The side of the crossbeam is also provided with a mechanism box for driving the interphase connecting rod to stretch the opening spring. A three-phase body corresponding to the three electrical devices is provided on the crossbeam, and two vacuum arc extinguishing chambers arranged along the height direction are provided in the three-phase body. The fifth crank arm is synchronously connected to the moving side guide rods of the two vacuum arc extinguishing chambers through an external connecting rod structure. When the present invention is in use, the two vacuum arc chambers are arranged in the height direction to change the current T-shaped layout, and the fifth crank arm is driven to move through the mechanism box. While cooperating with the opening spring, the guide rod on the moving side of the vacuum arc chamber is synchronously driven to move, so that closing and opening can be achieved, thereby using mechanical interlocking instead of electrical interlocking, simplifying the structure, and facilitating adjustment. Through the setting of the external connecting rod structure, the circuit breaker is convenient for adjusting the characteristic parameters and convenient for maintenance. The equipment structure in this solution is compact, convenient for transportation of the whole machine, and can be directly hoisted and installed on site.

[0008] Preferably, the main body includes two circuit breaker bushings arranged in the height direction, and the circuit breaker bushing includes an upper terminal block, a vacuum arc chamber, and a middle bracket which are arranged in sequence from top to bottom. The middle bracket of the upper circuit breaker bushing is connected to the upper terminal block of the lower circuit breaker bushing, and a voltage-equalizing capacitor located on the side of the vacuum arc chamber is also provided between the upper terminal block and the middle bracket. The middle bracket is also provided with the moving side guide rod connected to the connecting rod structure, and the moving side guide rod is connected to the moving side of the vacuum arc chamber through a conductive clamp. A support bushing supporting the lower circuit breaker bushing is also connected to the crossbeam, and the corresponding electrical equipment is connected to the middle bracket of the lower circuit breaker bushing through a copper busbar, and the middle bracket is connected to the conductive clamp of the corresponding vacuum arc chamber through a soft connection.

[0009] This preferred solution facilitates the support of two vacuum arc extinguishing chambers by setting up support sleeves, and enriches the configuration and improves the reliability of the equipment by setting up equalizing capacitors. At the same time, the equalizing capacitors can be placed on either side of the vacuum circuit breaker, so the installation position of the equalizing capacitors can be adjusted according to the actual installation situation.

[0010] Preferably, the connecting rod structure includes a second insulating pull rod extending upward and having its bottom end hinged on the fifth crank arm, the top end of the second insulating pull rod is connected to the first insulating pull rod, the first insulating pull rod and the second insulating pull rod respectively correspond to two circuit-breaking sleeves, the second insulating pull rod is hinged with a third crank arm, the third crank arm is coaxially arranged with the fourth crank arm, and the fourth crank arm is fixed with a pin shaft inserted into the corresponding movable side guide rod; the first insulating pull rod is hinged with a first crank arm, the first crank arm is coaxially arranged with the second crank arm, and the second crank arm is fixed with a corresponding pin shaft inserted into the corresponding movable side guide rod.

[0011] When this preferred solution is in use, the rotation of the fifth crank arm drives the first insulating pull rod and the second insulating pull rod to move in the same direction, thereby driving the first crank arm and the third crank arm to rotate synchronously in the same direction, and then, respectively drives the second crank arm and the fourth crank arm to rotate, thereby driving the two moving side guide rods to move in the same direction, thereby realizing the closing and opening of the two vacuum arc chambers at the same time.

[0012] Preferably, a lower terminal board is provided between the lower middle bracket and the support sleeve, and a second oil buffer is provided in the lower terminal board for the impact of the moving side guide rod opening gate, and a first oil buffer is provided in the upper middle bracket for the impact of the upper moving side guide rod opening gate, and the first oil buffer extends to the upper terminal board below.

[0013] This preferred solution facilitates buffering of the impact of the moving side guide rod by setting an oil buffer.

[0014] Preferably, the electrical equipment includes a current transformer.

[0015] Preferably, a cylindrical rain shield is fixedly connected to the circumferential surface of the second insulating pull rod, and a rubber insulating pad is provided between the middle bracket and the lower wiring board below.

[0016] In this preferred solution, a rainproof structure is formed by providing a rain cover, and high potential isolation is ensured by providing a rubber insulating pad, thereby facilitating series connection of a current transformer.

[0017] Preferably, the upper terminal plate is a casting, and the static side of the vacuum interrupter is connected and fixed to the upper terminal plate by bolts. The arrangement of this preferred solution ensures the strength of the upper terminal plate.

[0018] Preferably, a guide plate for the movable side guide rod to move in the height direction is further provided in the middle bracket, and a long hole for the pin to pass through is provided on the guide plate along the height direction extender.

[0019] This preferred solution provides a guiding effect to the pin shaft by providing the guide plate and the long hole.

[0020] Preferably, the mechanism box is connected to the crossbeam by bolts, and a mechanism output rod is provided in the mechanism box to drive the inter-phase connecting rod to move horizontally. This preferred solution facilitates integrated connection by connecting the mechanism box to the crossbeam, thereby facilitating overall loading and transportation.

[0021] A transmission control method for a double-break vacuum circuit breaker comprises the following steps: The mechanism output rod in the mechanism box is connected to the fifth crank arm, the fifth crank arm is respectively connected to the interphase connecting rod and the second insulating pull rod, the second insulating pull rod is connected to the third crank arm, the third crank arm drives the fourth crank arm to move through the shaft transmission, and the crank arm drives the moving side guide rod to move in the height direction through the pin shaft; When closing the circuit breaker, the output rod of the mechanism box moves horizontally to the right, and the fifth crank arm rotates counterclockwise, driving the interphase connecting rod to move to the right, while storing energy in the three opening springs. The fifth crank arm drives the first insulating pull rod and the second insulating pull rod to move downward at the same time, thereby driving the first crank arm and the third crank arm to move clockwise. The first crank arm and the third crank arm respectively drive the second crank arm and the fourth crank arm to move clockwise, thereby driving the moving side guide rod to move upward, thereby realizing the closing of the two vacuum interrupters. When opening the circuit breaker, the tripping mechanism in the mechanism box is unlocked, and the energy of the opening spring is released, driving the fifth crank arm 5 to move clockwise. The fifth crank arm simultaneously drives the first insulating pull rod and the second insulating pull rod to move upward, thereby driving the first crank arm and the third crank arm to move counterclockwise. The first crank arm and the third crank arm respectively drive the second crank arm and the fourth crank arm to move counterclockwise, thereby driving the moving side guide rod to move downward, thereby realizing the closing of the two vacuum arc chambers. The beneficial effects of the present invention are as follows: by arranging two vacuum interrupters in the height direction, the current T-shaped layout is changed, which has layout advantages, is convenient for maintenance and characteristic adjustment, is convenient for adjusting the phase-to-phase synchronization of the circuit breaker and the synchronization of the two breaks in a single phase, and has a compact structure; the fifth crank arm is driven to move by the mechanism box, and while cooperating with the opening spring, the guide rod on the moving side of the vacuum interrupter is driven to move synchronously, so that closing and opening can be achieved, thereby using mechanical interlocking instead of electrical interlocking, three-phase mechanical linkage, single-mechanism power source, high reliability, low cost compared to electrical interlocking, no full-phase action control cabinet, and saving site space; through the setting of the external connecting rod structure, the circuit breaker is convenient to adjust the characteristic parameters, and convenient Maintenance and characteristic adjustment, the equipment in this solution has a compact structure, which is convenient for transportation of the whole machine and can be directly hoisted and installed on site; the setting of the support sleeve makes it easy to support the two vacuum arc extinguishing chambers; the setting of the equalizing capacitor avoids the situation where surge current and overvoltage cause damage to the capacitor and circuit breaker, thereby improving the reliability of the power grid equipment, the double-break integrated uniform capacitor, the equalizing capacitor has a flexible installation position, improves the unbalanced voltage of the break, limits the recovery voltage amplitude, improves the arc extinguishing ability, protects the capacitor and circuit breaker, enriches the configuration, and improves the reliability of the equipment; through the integrated setting, the whole equipment is small in size, provides monitoring, measurement and protection functions for the power grid equipment, has a high degree of integration, and ensures the stable operation of the power grid system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the interior of the beam; Figure 3 It is a schematic side view of the main body; Figure 4 for Figure 3 The enlarged schematic diagram at A in the middle; Figure 5 for Figure 3 The enlarged schematic diagram of point B in the middle; Figure 6 It is a schematic diagram of the guide plate; Figure 7 It is a schematic diagram of the prior art; As shown in the figure: 1. First crank arm, 2. Second crank arm, 3. Third crank arm, 4. Fourth crank arm, 5. Fifth crank arm, 6. Current transformer, 7. Interphase connecting rod, 8. Mechanism box, 9. Third rotating shaft, 10. First rotating shaft, 11. First insulating pull rod, 12. Second insulating pull rod, 13. Voltage-equalizing capacitor, 14. Upper terminal block, 15. Vacuum interrupter, 16. Middle bracket, 17. Lower terminal block, 18. Guide plate, 19. Contact spring, 20. Copper busbar, 21. Second oil buffer, 22. First oil buffer, 23. Conductive clip, 24. Moving side guide rod, 25. Disconnection spring, 26. Flexible connection, 27. Rain cover. DETAILED DESCRIPTION

[0023] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0024] See attached Figure 1-7 The present invention provides a double-break vacuum circuit breaker and a transmission control method thereof, comprising three current transformers 6 arranged in a crossbeam and corresponding to three phases, a fifth crank arm 5 hinged to the opening spring 25 of the current transformer 6 and hinged to the crossbeam, and an interphase connecting rod 7 hinged to the three fifth crank arms 5. A mechanism box 8 for driving the interphase connecting rod 7 to stretch the opening spring is also provided on the side of the crossbeam. A three-phase body corresponding to the three electrical devices is provided on the crossbeam. Two vacuum arc extinguishing chambers 15 arranged along the height direction are provided in the three-phase body. The fifth crank arm 5 is synchronously connected to the moving side guide rods 24 of the two vacuum arc extinguishing chambers 15 through an external connecting rod structure. The main body includes two circuit breaker bushings arranged in the height direction, and the circuit breaker bushing includes an upper wiring board, a vacuum arc chamber 15, and a middle bracket 16 which are arranged in sequence from top to bottom. The middle bracket 16 of the upper circuit breaker bushing is connected to the upper wiring board of the lower circuit breaker bushing. A voltage-equalizing capacitor 13 located on the side of the vacuum arc chamber 15 is also provided between the upper wiring board and the middle bracket 16. The middle bracket 16 is also provided with the moving side guide rod 24 connected to the connecting rod structure. The moving side guide rod 24 is connected to the moving side of the vacuum arc chamber 15 through a conductive clip 23. A support bushing supporting the lower circuit breaker bushing is also connected to the crossbeam. The corresponding current transformer 6 is connected to the middle bracket 16 of the lower circuit breaker bushing through a copper bus 20, and the middle bracket 16 is connected to the conductive clip 23 of the corresponding vacuum arc chamber 15 through a soft connection.

[0025] The connecting rod structure includes a second insulating pull rod 12 extending upward and hinged at the bottom end on the fifth crank arm 5, the top end of the second insulating pull rod 12 is connected to the first insulating pull rod 11, the first insulating pull rod 11 and the second insulating pull rod 12 correspond to two circuit breaker sleeves respectively, the second insulating pull rod 12 is hinged with a third crank arm 3, the third crank arm 3 is coaxially arranged with the fourth crank arm 4, and the fourth crank arm 4 is fixedly connected with a pin shaft inserted into the corresponding movable side guide rod 24; the first insulating pull rod 11 is hinged with a first crank arm 1, the first crank arm 1 is coaxially arranged with the second crank arm 2, and the second crank arm 2 is fixedly connected with a corresponding pin shaft inserted into the corresponding movable side guide rod 24.

[0026] A third rotating shaft 9 is hinged in the lower middle bracket 16, and the third crank arm 3 and the fourth crank arm 4 are both connected to the third rotating shaft 9. The rotation of the third crank arm 3 drives the third rotating shaft 9 to rotate, and the rotation of the third rotating shaft 9 thereby drives the fourth crank arm 4 to rotate; a first rotating shaft 10 is hinged in the upper middle bracket 16, and the first crank arm 1 and the second crank arm 2 are both connected to the first rotating shaft 10. The rotation of the first crank arm 1 drives the first rotating shaft 10 to rotate, and the rotation of the first rotating shaft 10 thereby drives the second crank arm 2 to rotate.

[0027] A lower terminal plate 17 is also provided between the lower middle bracket 16 and the support sleeve. A second oil buffer 21 is provided in the lower terminal plate 17 for the moving side guide rod 24 to impact when the gate is opened. A first oil buffer 22 is provided in the upper middle bracket 16 for the upper moving side guide rod 24 to impact when the gate is opened. The first oil buffer 22 extends to the lower upper terminal plate 14.

[0028] A cylindrical rain shield 27 is fixedly connected to the circumferential surface of the second insulating pull rod 12, and a rubber insulating pad is provided between the lower middle bracket and the lower terminal board to ensure high-potential isolation, thereby facilitating the series connection of the current transformer. The middle bracket located above and the upper terminal board located below are at the same potential, so there is no need to set a rubber insulating pad.

[0029] The upper terminal plate is a casting, and the static side of the vacuum interrupter 15 is connected and fixed thereto by bolts.

[0030] A guide plate 18 is further provided in the middle bracket 16 for the movable side guide rod 24 to move in the height direction. The guide plate 18 is provided with a long hole extending in the height direction for the pin to pass through.

[0031] The mechanism box 8 is connected to the crossbeam by bolts, and a mechanism output rod is arranged in the mechanism box to drive the inter-phase connecting rod to move and move in the horizontal direction. The mechanism box 8 includes a spring operating mechanism, which is a prior art.

[0032] In particular, for ease of understanding, due to the provision of two circuit breaker bushings, in order to distinguish the circuit breaker bushings, they are described as an upper circuit breaker bushing and a lower circuit breaker bushing according to their different positions, and the same applies to the upper terminal block, the vacuum interrupter 15, and the middle bracket 16.

[0033] A transmission control method for a double-break vacuum circuit breaker comprises the following steps: The output rod of the mechanism box 8 is connected to the fifth crank arm 5, the fifth crank arm 5 is respectively connected to the interphase connecting rod 7 and the second insulating pull rod 12, the second insulating pull rod 12 is connected to the third crank arm 3, the third crank arm 3 drives the fourth crank arm 4 to move through the shaft transmission, and the crank arm drives the movable side guide rod 24 to move along the height direction through the pin shaft; When closing, the output rod of the mechanism box 8 moves horizontally to the right, and the fifth crank arm 5 rotates counterclockwise, driving the interphase connecting rod 7 to move to the right, and at the same time storing energy in the three opening springs 25. The fifth crank arm 5 drives the first insulating pull rod and the second insulating pull rod 12 to move downward at the same time, thereby driving the first crank arm 1 and the third crank arm 3 to move clockwise. The first crank arm 1 and the third crank arm 3 respectively drive the second crank arm 2 and the fourth crank arm 4 to move clockwise, thereby driving the moving side guide rod 24 to move upward, thereby realizing the closing of the two vacuum interrupters 15; When opening the circuit breaker, the tripping mechanism in the mechanism box 8 is unlocked, and the energy of the opening spring 25 is released, driving the fifth crank arm 55 to move clockwise. The fifth crank arm 5 simultaneously drives the first insulating pull rod and the second insulating pull rod 12 to move upward, thereby driving the first crank arm 1 and the third crank arm 3 to move counterclockwise. The first crank arm 1 and the third crank arm 3 respectively drive the second crank arm 2 and the fourth crank arm 4 to move counterclockwise, thereby driving the moving side guide rod 24 to move downward, thereby realizing the closing of the two vacuum arc extinguishing chambers 15.

[0034] The present invention changes the current T-shaped layout by arranging two vacuum interrupters in the height direction, has layout advantages, is convenient for maintenance and characteristic adjustment, is convenient for phase-to-phase synchronization adjustment of the circuit breaker and the synchronization of two breaks in a single phase, and has a compact structure; the fifth crank arm is driven to move by the mechanism box, and while cooperating with the opening spring, the guide rod on the moving side of the vacuum interrupter is driven to move synchronously, so that closing and opening can be achieved, thereby using mechanical interlocking instead of electrical interlocking, three-phase mechanical linkage, single-mechanism power source, high reliability, low cost compared to electrical interlocking, no full-phase action control cabinet, and saving site space; through the setting of the external connecting rod structure, the circuit breaker is convenient to adjust the characteristic parameters, convenient for maintenance and Characteristic adjustment: The equipment in this solution has a compact structure, which is convenient for transportation of the whole machine and can be directly hoisted and installed on site. The setting of the support sleeve makes it easy to support the two vacuum arc extinguishing chambers. The setting of the equalizing capacitor avoids the situation where surge current and overvoltage cause damage to the capacitor and circuit breaker, thereby improving the reliability of the power grid equipment. The double-break integrated uniform capacitor and the flexible installation position of the equalizing capacitor improve the unbalanced voltage of the break, limit the recovery voltage amplitude, improve the arc extinguishing ability, protect the capacitor and circuit breaker, enrich the configuration, and improve the reliability of the equipment. Through the integrated setting, the whole equipment is small in size, provides monitoring, measurement and protection functions for the power grid equipment, has a high degree of integration, and ensures the stable operation of the power grid system. Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A double-break vacuum circuit breaker, characterized in that: The invention comprises three electrical devices arranged in a crossbeam and corresponding to three phases, a fifth crank arm (5) hinged to the electrical device opening spring (25) and hinged to the crossbeam, and an interphase connecting rod (7) hinged to the three fifth crank arms (5). The side of the crossbeam is also provided with a mechanism box (8) for driving the interphase connecting rod (7) to stretch the opening spring. The crossbeam is provided with a three-phase body arranged corresponding to the three electrical devices. Two vacuum interrupter chambers (15) arranged in the height direction are provided in the three-phase body. The fifth crank arm (5) is synchronously connected to the moving side guide rods (24) of the two vacuum interrupter chambers (15) through an external connecting rod structure.

2. The double-break vacuum circuit breaker according to claim 1, characterized in that: The body comprises two circuit-breaking bushings arranged in a height direction, the circuit-breaking bushings comprising an upper wiring board (14), a vacuum arc extinguishing chamber (15), and a middle bracket (16) arranged in sequence from top to bottom, the middle bracket (16) of the upper circuit-breaking bushing being connected to the upper wiring board of the lower circuit-breaking bushing, a voltage-equalizing capacitor (13) located on the side of the vacuum arc extinguishing chamber (15) is also provided between the upper wiring board and the middle bracket (16), the middle bracket (16) is also provided with the moving side guide rod (24) connected to the connecting rod structure, the moving side guide rod (24) is connected to the moving side of the vacuum arc extinguishing chamber (15) through a conductive clip (23), a support bushing supporting the lower circuit-breaking bushing is also connected to the crossbeam, the corresponding electrical equipment is connected to the middle bracket (16) of the lower circuit-breaking bushing through a copper busbar (20), and the middle bracket (16) is connected to the conductive clip (23) of the corresponding vacuum arc extinguishing chamber (15) through a flexible connection.

3. The double-break vacuum circuit breaker according to claim 2, characterized in that: The connecting rod structure comprises a second insulating pull rod (12) extending upward and having its bottom end hinged on the fifth crank arm (5); the top end of the second insulating pull rod (12) is connected to the first insulating pull rod (11); the first insulating pull rod (11) and the second insulating pull rod (12) respectively correspond to two disconnecting sleeves; the second insulating pull rod (12) is hinged with a third crank arm (3); the third crank arm (3) is coaxially arranged with the fourth crank arm (4); the fourth crank arm (4) is fixedly connected with a pin shaft inserted into the corresponding movable side guide rod (24); the first insulating pull rod (11) is hinged with a first crank arm (1); the first crank arm (1) is coaxially arranged with the second crank arm (2); the second crank arm (2) is fixedly connected with a corresponding pin shaft inserted into the corresponding movable side guide rod (24).

4. The double-break vacuum circuit breaker according to claim 3, characterized in that: A lower terminal plate (17) is further provided between the lower middle bracket (16) and the support sleeve. A second oil buffer (21) is provided in the lower terminal plate (17) for the moving side guide rod (24) to impact when the gate is opened. A first oil buffer (22) is provided in the upper middle bracket (16) for the moving side guide rod (24) to impact when the gate is opened. The first oil buffer (22) extends into the lower upper terminal plate (14).

5. The double-break vacuum circuit breaker according to claim 3, characterized in that: The electrical equipment comprises a current transformer (6).

6. The double-break vacuum circuit breaker according to claim 4, characterized in that: A cylindrical rain shield (27) is fixedly connected to the circumferential surface of the second insulating pull rod (12), and a rubber insulating pad is provided between the middle bracket and the lower wiring board at the lower side.

7. The double-break vacuum circuit breaker according to claim 1, characterized in that: The upper terminal plate is a casting, and the static side of the vacuum interrupter (15) is connected and fixed thereto by bolts.

8. The double-break vacuum circuit breaker according to claim 1, characterized in that: A guide plate (18) for the movable side guide rod (24) to move in the height direction is also provided in the middle bracket (16), and a long hole extending in the height direction for the pin to pass through is provided on the guide plate (18).

9. The double-break vacuum circuit breaker according to claim 1, characterized in that: The mechanism box (8) is connected to the crossbeam by bolts, and a mechanism output rod is provided in the mechanism box for driving the interphase connecting rods to move in the horizontal direction.

10. The transmission control method for a double-break vacuum circuit breaker according to claim 5, characterized in that: The following steps are involved: The mechanism output rod in the mechanism box (8) is connected to the fifth crank arm (5), the fifth crank arm (5) is respectively connected to the interphase connecting rod (7) and the second insulating pull rod (12), the second insulating pull rod (12) is connected to the third crank arm (3), the third crank arm (3) drives the fourth crank arm (4) to move through the shaft transmission, and the crank arm drives the moving side guide rod (24) to move along the height direction through the pin shaft; When closing the circuit breaker, the output rod of the mechanism box (8) moves horizontally to the right, the fifth crank arm (5) rotates counterclockwise, driving the interphase connecting rod (7) to move to the right, and storing energy in the three opening springs (25). The fifth crank arm (5) drives the first insulating pull rod and the second insulating pull rod (12) to move downward at the same time, thereby driving the first crank arm (1) and the third crank arm (3) to move clockwise. The first crank arm (1) and the third crank arm (3) respectively drive the second crank arm (2) and the fourth crank arm (4) to move clockwise, thereby driving the moving side guide rod (24) to move upward, thereby achieving the closing of the two vacuum interrupters (15); When the circuit breaker is opened, the tripping mechanism in the mechanism box (8) is unlocked, and the energy of the circuit breaker spring (25) is released, driving the fifth crank arm (5) to move clockwise. The fifth crank arm (5) simultaneously drives the first insulating pull rod and the second insulating pull rod (12) to move upward, thereby driving the first crank arm (1) and the third crank arm (3) to move counterclockwise. The first crank arm (1) and the third crank arm (3) respectively drive the second crank arm (2) and the fourth crank arm (4) to move counterclockwise, thereby driving the moving side guide rod (24) to move downward, thereby achieving the closing of the two vacuum arc extinguishing chambers (15).

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