Primary and secondary fusion built-in isolation knife circuit breaker

Abstract

The invention discloses a primary and secondary fusion built-in isolation knife circuit breaker, and relates to the field of primary and secondary fusion power distribution equipment for a power distribution network, the primary and secondary fusion built-in isolation knife circuit breaker comprises a pole-mounted circuit breaker and a mechanism box, the body of the pole-mounted circuit breaker is integrated with three current transformers, and the mechanism box is fixedly connected to one side of the pole-mounted circuit breaker; three electrical interface holes used for containing current transformers are formed in the box wall of the mechanism box, an isolation disconnecting link unit is arranged in the mechanism box, the isolation disconnecting link unit is internally arranged and integrated in the mechanism box, the isolation disconnecting link unit and a pole-mounted circuit breaker form an integrated design, the overall structural layout is greatly simplified, the structure is simple, and the cost is low. And the three current transformers integrated on the pole-mounted circuit breaker body are directly butted with the moving contact mechanism through the electrical interface holes preset in the mechanism box, so that the connection is convenient, the contact between the electrical connection part and the external environment is reduced, the erosion of environmental factors such as outdoor wind and rain, dust, corrosive gas and the like is effectively isolated, and the operation stability is ensured.

Description

Technical Field

[0001] This invention belongs to the field of integrated primary and secondary power distribution equipment for power distribution networks, and specifically relates to an integrated primary and secondary power distribution equipment with built-in isolating switch circuit breaker. Background Technology

[0002] In recent years, with the State Grid Corporation of China continuously raising its requirements for the standardization and intelligence of power distribution equipment, pole-mounted circuit breakers with a support structure have become the mainstream equipment in medium-voltage power distribution networks due to their advantages such as compact structure, convenient installation, and simple maintenance, and have been clearly listed as a key technology route for future promotion.

[0003] However, the widely used pole-mounted circuit breakers generally adopt an external disconnecting switch scheme, which has exposed many safety hazards and reliability problems in actual operation.

[0004] External disconnect switches are exposed to the outdoor environment for a long time without effective sealing protection. They are easily corroded by rainwater, moisture, salt spray, dust and industrial pollution, which leads to oxidation and corrosion of the contacts, resulting in increased contact resistance, excessive temperature rise or even contact failure, seriously affecting the electrical performance and service life of the equipment.

[0005] Secondly, the external disconnect switch lacks shielding on its primary energized section. In severe weather, foreign objects such as tree branches and plastic films blown down by strong winds can easily attach to the energized part, affecting power supply safety.

[0006] Therefore, we propose a primary and secondary integrated built-in isolating circuit breaker to solve the above problems. Summary of the Invention

[0007] To address the problem that external disconnect switches are exposed to outdoor environments for extended periods without effective sealing and protection, thus affecting power supply safety, this invention provides a primary and secondary integrated built-in disconnect switch circuit breaker.

[0008] The solution adopted by the present invention to solve its technical problem is: a primary and secondary integrated built-in isolating knife circuit breaker, including a pole-mounted circuit breaker and a mechanism box. The body of the pole-mounted circuit breaker integrates three current transformers. The mechanism box is fixedly connected to one side of the pole-mounted circuit breaker. Its box wall has three electrical interface holes for accommodating the current transformers. The mechanism box is equipped with an isolating knife switch unit inside. The isolating switch unit includes a base frame, a drive mechanism, and three sets of moving contact mechanisms. Three support insulators are fixedly installed on the top of the base frame. Each support insulator is provided with an outgoing terminal and a stationary contact on its top. One end of the outgoing terminal extends out of the mechanism box. The moving contact mechanism includes a main current-carrying blade body and an isolation blade that can slide laterally relative to the main current-carrying blade body. One end of the main current-carrying blade body is open and electrically connected to the wiring terminal of the current transformer, and the other end is open to accommodate the isolation blade. The isolation blade has a slot at the end opposite to the main current-carrying blade body, so that the isolation blade can be plugged into the corresponding stationary contact for conduction when the circuit is closed. The drive mechanism includes a lifting actuator and a constraint release component that is linked to the isolation blade; During the closing process, the lifting actuator pushes the isolation blade against the stationary contact through the constraint release assembly, so that the socket is in close contact with the stationary contact; During the tripping process, the lifting actuator reverses its movement, releasing the constraint on the isolating blade, allowing the isolating blade to automatically slide laterally away from the stationary contact under the action of the elastic reset element, thus completing reliable isolation.

[0009] Preferably, an observation window is provided on the top of the mechanism box.

[0010] Preferably, the main flow-carrying blade body has grooves on both the front and rear sides, and a slider is provided in the groove, which is fixedly connected to the isolation blade.

[0011] Preferably, the outer end of the slider is fixedly connected to a sliding seat, and a fixed seat is provided on one side of the sliding seat. The fixed seat is fixedly installed on the outer side of the main flow-carrying blade body, and the elastic reset element is a spring installed between the fixed seat and the sliding seat.

[0012] Preferably, guide ridges are provided laterally on both the front and rear sides of the isolation blade, and the guide ridges are slidably disposed in the slides opened in the inner wall of the main flow-carrying blade body.

[0013] Preferably, the constraint release assembly includes a lifting seat and three squeezing blocks. The three squeezing blocks are respectively disposed inside the three main current-carrying blades. The squeezing blocks have inclined surfaces that cooperate with the inclined surfaces at the ends of the isolation blades. The lifting seat is disposed below the squeezing blocks and is fixedly connected to each of the squeezing blocks by a tension insulator.

[0014] Preferably, the lifting actuator is an electric cylinder, which is fixedly mounted on the base frame, and its piston rod is fixedly connected to the lifting seat to drive the lifting seat to move up and down.

[0015] Preferably, a control switch is fixedly installed on the outer side of the mechanism box, and the control switch is electrically connected to the electric cylinder.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention integrates the isolating switch unit inside the mechanism box, forming an integrated design with the pole-mounted circuit breaker, which greatly simplifies the overall structural layout. Furthermore, the three current transformers integrated into the pole-mounted circuit breaker body directly connect to the moving contact mechanism through the pre-set electrical interface holes in the mechanism box. This not only facilitates connection but also reduces the contact between electrical connection parts and the external environment, effectively isolating them from the erosion of outdoor wind, rain, dust, corrosive gases, and other environmental factors, thus ensuring operational stability.

[0017] 2. By adopting a transverse sliding moving contact mechanism, the space required for linear sliding motion is less than the swing radius required for a rotating structure. Its layout is more compact and perfectly suits the design requirements of integrating the isolating switch unit into the mechanism box.

[0018] 3. When closing the circuit, the present invention controls the synchronous contraction of two electric cylinders, causing the lifting seat and three squeezing blocks to move upward synchronously. During the movement, the squeezing blocks push the isolation blade against the stationary contact, ensuring that the socket and the stationary contact are in close contact, thus ensuring the stability and conductivity of the current-carrying path. When opening the circuit, the invention controls the synchronous extension of two electric cylinders, causing the lifting seat and three squeezing blocks to move downward synchronously. Under the action of the spring, the isolation blade automatically slides laterally away from the stationary contact, forming a clear mechanical isolation gap, which can completely cut off the electrical circuit and meet the safety isolation requirements during maintenance.

[0019] 4. The present invention uses the front and rear side grooves and sliders to cooperate, and the guide protrusion of the isolation blade to cooperate with the slide rail on the inner wall of the main flow-carrying blade body. The double constraint ensures the straightness and stability of the isolation blade when sliding laterally, and avoids movement deviation or jamming.

[0020] 5. By setting up an observation window, this invention makes it easier for maintenance personnel to intuitively judge the opening and closing positions of the isolation blades, thereby improving inspection efficiency and fault diagnosis speed, and reducing maintenance costs. Attached Figure Description

[0021] Figure 1 This is a frontal cross-sectional view of the present invention; Figure 2 This is one of the three-dimensional structural schematic diagrams of the isolating switch unit of the present invention; Figure 3 This is the second schematic diagram of the three-dimensional structure of the isolating switch unit of the present invention; Figure 4 This is a front view structural diagram of the present invention.

[0022] In the diagram: 1 Mechanism box, 11 Observation window, 2 Pole-mounted circuit breaker, 3 Control switch, 4 Isolating switch unit, 41 Base frame, 42 Post insulator, 43 Pull insulator, 44 Lifting seat, 45 Electric cylinder, 46 Stationary contact, 47 Outgoing terminal, 481 Isolating blade, 482 Main current-carrying blade body, 483 Fixed seat, 484 Slider, 485 Spring, 486 Sliding seat, 487 Guide ridge, 49 Extrusion block. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Please see Figure 1-4 This invention provides a technical solution for a primary and secondary integrated built-in isolating circuit breaker: Example 1: according to Figure 1-4 As shown, it includes a pole-mounted circuit breaker 2 and a mechanism box 1. The pole-mounted circuit breaker 2 adopts the ZW32-12 type standardized primary and secondary integrated pole-mounted circuit breaker. The main body of the pole-mounted circuit breaker 2 integrates three current transformers. The mechanism box 1 is fixedly connected to one side of the pole-mounted circuit breaker 2, and its box wall has three electrical interface holes for accommodating the current transformers.

[0025] The mechanism box 1 is equipped with an isolating switch unit 4. By embedding the isolating switch unit 4 inside the mechanism box 1, the isolating switch unit 4 can be effectively prevented from being directly exposed to the outdoor environment. This not only reduces the corrosion caused by rain, moisture, salt spray, etc., but also prevents the isolating switch unit 4 from contacting foreign objects such as tree branches and plastic film, thus ensuring the electrical performance and service life of the equipment and improving power supply safety.

[0026] The isolating switch unit 4 includes a base frame 41, a drive mechanism, and three sets of moving contact mechanisms. Three post insulators 42 are fixedly installed on the top of the base frame 41. The post insulators 42 provide good insulation and support. Each post insulator 42 has an outgoing terminal 47 and a stationary contact 46 on its top. One end of the outgoing terminal 47 extends out of the mechanism box 1 to achieve connection with external lines.

[0027] The moving contact mechanism includes a main current-carrying blade 482 and an isolation blade 481 that can slide laterally relative to the main current-carrying blade 482. Both the main current-carrying blade 482 and the isolation blade 481 are made of chromium zirconium copper and are silver-plated on the contact surface. One end of the main current-carrying blade 482 is open and electrically connected to the wiring terminal of the current transformer to ensure stable current transmission, while the other end is open to accommodate the isolation blade 481.

[0028] The isolating blade 481 has an insertion port at the end opposite to the main current-carrying blade body 482, so that the isolating blade 481 can be inserted and connected to the corresponding stationary contact 46 in the closed state, ensuring the stability and conductivity of the current-carrying path.

[0029] The main flow-carrying cutter body 482 has grooves on both the front and rear sides, and a slider 484 is installed in the groove. The slider 484 is fixedly connected to the isolation blade 481. The slider 484 and the groove cooperate to provide guidance for the lateral sliding of the isolation blade 481, ensuring the smoothness of the sliding process of the isolation blade 481 and avoiding deviation that would affect the docking accuracy with the stationary contact 46. A sliding seat 486 is fixedly connected to the outer end of the slider 484. A fixed seat 483 is provided on one side of the sliding seat 486. The fixed seat 483 is fixedly installed on the outer side of the main flow-carrying cutter body 482.

[0030] Both the front and rear sides of the main current-carrying blade body 482 are provided with elastic reset elements. The elastic reset elements are springs 485 installed between the fixed base 483 and the sliding base 486. The springs 485 provide reliable tension for the opening reset of the isolating blade 481, ensuring that the isolating blade 481 can quickly and accurately separate from the stationary contact 46 when the circuit is opened.

[0031] The drive mechanism includes a lifting actuator and a constraint release assembly linked to the isolating blade 481. The constraint release assembly includes a lifting seat 44 and three pressing blocks 49. The three pressing blocks 49 are respectively disposed inside the three main current-carrying blade bodies 482. The pressing blocks 49 have inclined surfaces and cooperate with the inclined surfaces at the ends of the isolating blades 481. The lifting seat 44 is disposed below the pressing blocks 49 and is fixedly connected to each pressing block 49 by a tension insulator 43. The tension insulator 43 ensures the reliability of the connection and the insulation performance between the lifting seat 44 and the pressing blocks 49.

[0032] The lifting actuator is an electric cylinder 45, which is fixedly mounted on the base frame 41. Its piston rod passes through the base frame 41 and is fixedly connected to the lifting seat 44, which is used to drive the lifting seat 44 to move up and down. The electric cylinder 45 has the characteristics of stable driving force, high control precision and fast response speed. It can accurately control the lifting stroke of the lifting seat 44, thereby ensuring the docking pressure and separation effect between the isolating blade 481 and the stationary contact 46. A control switch 3 is fixedly installed on the outer side of the mechanism box 1. The control switch 3 is electrically connected to the electric cylinder 45. The operator can conveniently control the action of the electric cylinder 45 by operating the control switch 3 to realize the closing and opening operation of the circuit breaker 2. The operation is simple and convenient.

[0033] During the closing process, the operator controls the start of the electric cylinder 45 via the control switch 3. The piston rod of the electric cylinder 45 extends, driving the lifting seat 44 to move upward. The lifting seat 44 pulls the insulator 43, causing the three pressing blocks 49 to move upward synchronously. The pressing blocks 49 interact with the inclined surface of the isolating blade 481 through their inclined surfaces, generating a lateral thrust, which pushes the isolating blade 481 to slide laterally along the main current-carrying blade body 482 until the insertion port at the end of the isolating blade 481 is tightly inserted and connected with the corresponding stationary contact 46, completing the closing operation. At this time, the pressing blocks 49 maintain the pressing state on the isolating blade 481 to ensure the connection stability after closing.

[0034] During the tripping process, the operator controls the electric cylinder 45 to reverse its movement via the control switch 3. The piston rod of the electric cylinder 45 retracts, driving the lifting seat 44 to move downward. The lifting seat 44 pulls the pressing block 49 downward synchronously via the pulling insulator 43. The pressing block 49 releases its constraint on the isolating blade 481. At this time, the spring 485 pulls the sliding seat 486 to move in the opposite direction. The sliding seat 486 drives the isolating blade 481 to slide laterally away from the stationary contact 46 via the slider 484, achieving reliable isolation and completing the tripping operation.

[0035] Example 2: Based on Example 1, such as Figure 1 and Figure 2 As shown, the top of the mechanism box 1 is equipped with an observation window 11, which makes it easy for maintenance personnel to intuitively judge the opening and closing position of the isolation blade 481, improve inspection efficiency and fault diagnosis speed, and reduce maintenance costs.

[0036] The isolation blade 481 is provided with guide ribs 487 on both the front and rear sides. The guide ribs 487 are slidably disposed in the slides opened in the inner wall of the main flow-carrying blade body 482. The cooperation between the guide ribs 487 and the slides further enhances the guiding effect of the isolation blade 481 during the sliding process, effectively preventing the isolation blade 481 from twisting or shifting during the sliding process, and further improving the accuracy of the docking between the isolation blade 481 and the stationary contact 46 and the stability of the equipment operation.

[0037] This invention integrates the isolating switch unit 4 inside the mechanism box 1, forming an integrated design with the pole-mounted circuit breaker 2, which greatly simplifies the overall structural layout. Furthermore, the three current transformers integrated into the pole-mounted circuit breaker 2 are directly connected to the moving contact mechanism through the pre-set electrical interface holes in the mechanism box 1. This not only facilitates connection but also reduces the contact between the electrical connection parts and the external environment, effectively isolating them from the erosion of outdoor wind, rain, dust, corrosive gases, and other environmental factors, thus ensuring operational stability.

Claims

1. A primary and secondary integrated built-in isolating switch circuit breaker, comprising a pole-mounted circuit breaker and a mechanism box, wherein the body of the pole-mounted circuit breaker integrates three current transformers, and the mechanism box is fixedly connected to one side of the pole-mounted circuit breaker, and its box wall has three electrical interface holes for accommodating the current transformers, characterized in that: The mechanism box is equipped with an isolation switch unit; The isolating switch unit includes a base frame, a drive mechanism, and three sets of moving contact mechanisms. Three support insulators are fixedly installed on the top of the base frame. Each support insulator is provided with an outgoing terminal and a stationary contact on its top. One end of the outgoing terminal extends out of the mechanism box. The moving contact mechanism includes a main current-carrying blade body and an isolation blade that can slide laterally relative to the main current-carrying blade body. One end of the main current-carrying blade body is open and electrically connected to the wiring terminal of the current transformer, and the other end is open to accommodate the isolation blade. The isolation blade has a slot at the end opposite to the main current-carrying blade body, so that the isolation blade can be plugged into the corresponding stationary contact for conduction when the circuit is closed. The drive mechanism includes a lifting actuator and a constraint release component that is linked to the isolation blade; During the closing process, the lifting actuator pushes the isolation blade against the stationary contact through the constraint release assembly, so that the socket is in close contact with the stationary contact; During the tripping process, the lifting actuator reverses its movement, releasing the constraint on the isolating blade, allowing the isolating blade to automatically slide laterally away from the stationary contact under the action of the elastic reset element, thus completing reliable isolation.

2. The integrated primary and secondary isolation circuit breaker according to claim 1, characterized in that: An observation window is provided on the top of the mechanism box.

3. The integrated primary and secondary isolation circuit breaker according to claim 1, characterized in that: The main flow-carrying blade body has grooves on both the front and rear sides, and sliders are installed in the grooves. The sliders are fixedly connected to the isolation blades.

4. The integrated primary and secondary isolation circuit breaker according to claim 3, characterized in that: The outer end of the slider is fixedly connected to a sliding seat, and a fixed seat is provided on one side of the sliding seat. The fixed seat is fixedly installed on the outer side of the main flow-carrying cutter body. The elastic reset element is a spring installed between the fixed seat and the sliding seat.

5. The integrated primary and secondary isolation circuit breaker according to claim 1, characterized in that: The isolation blade has guide ridges arranged laterally on both its front and rear sides, and the guide ridges are slidably arranged in the slides opened in the inner wall of the main flow-carrying blade body.

6. The integrated primary and secondary isolation circuit breaker according to claim 1, characterized in that: The constraint release assembly includes a lifting seat and three squeezing blocks. The three squeezing blocks are respectively disposed inside the three main current-carrying blade bodies. The squeezing blocks have inclined surfaces that cooperate with the inclined surfaces at the ends of the isolation blades. The lifting seat is disposed below the squeezing blocks and is fixedly connected to each squeezing block by a tension insulator.

7. The integrated primary and secondary isolation circuit breaker according to claim 6, characterized in that: The lifting actuator is an electric cylinder, which is fixedly mounted on the base frame. Its piston rod is fixedly connected to the lifting seat and is used to drive the lifting seat to move up and down.

8. The integrated primary and secondary isolation circuit breaker according to claim 7, characterized in that: A control switch is fixedly installed on the outer side of the mechanism box, and the control switch is electrically connected to the electric cylinder.

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