Pole-mounted vacuum circuit breaker and control method thereof

Abstract

The invention provides a pole-mounted vacuum circuit breaker and a control method thereof, and relates to the technical field of power distribution equipment of a power system. The pole-mounted vacuum circuit breaker comprises a circuit breaker body, a multi-transformation-ratio current transformer and an isolation module, and further comprises an automatic transformation ratio adjustment module which comprises a change-over switch and a first motor used for driving the change-over switch to switch taps; the electric on-off isolation module comprises a motor module used for driving the isolation module to act; and the central control unit is electrically connected with the first motor and the motor module, and is used for controlling the first motor to act according to the line load change so as to automatically switch the transformation ratio of the mutual inductor, and controlling the motor module to act according to an instruction so as to realize electric closing and opening of the isolation module. On the basis, the problems that an existing pole-mounted vacuum circuit breaker cannot adjust the transformation ratio of a mutual inductor in time according to the load requirement, and the isolation function depends on manual operation are solved.

Description

Technical Field

[0001] This invention relates to the field of power system distribution equipment technology, specifically to a pole-mounted vacuum circuit breaker and its control method. Background Technology

[0002] Pole-mounted vacuum circuit breakers are critical equipment in power distribution networks, undertaking important control and protection tasks in the power system. When a power system fault occurs, pole-mounted vacuum circuit breakers are needed to quickly interrupt the fault current to protect power equipment and ensure the safe and stable operation of the power system. However, existing pole-mounted vacuum circuit breakers have the following limitations in practical applications: Firstly, the transformer ratio of traditional pole-mounted vacuum circuit breakers is usually fixed, which leads to limited protection range and poor adaptability. They can only adapt to specific current ranges and are difficult to flexibly cope with different line configurations or load requirements. For example, in power distribution networks, user loads (such as industrial and residential electricity) fluctuate significantly with time and season, and the current and voltage ranges may vary within a large range (for example, the current increases sharply during the irrigation period of agricultural networks and drops sharply during the nighttime off-peak period). Fixed-ratio transformers are prone to problems such as measurement saturation (decreased accuracy) under high loads and weak signals (increased error) under low loads when the ranges are mismatched.

[0003] While some pole-mounted vacuum circuit breakers with multiple transformer ratios exist in the existing technology, maintenance personnel often need to climb up to the vicinity of the switch to perform manual adjustments (such as replacing current transformers or wiring terminals). To ensure personnel safety, these operations must be performed after a power outage, which significantly affects the stability and reliability of the power supply and increases the safety risks and maintenance costs of manual pole climbing. Furthermore, because manual switching of transformer ratios is required, timely adjustments cannot be made when the load changes, which can negatively impact metering equipment and measurement accuracy.

[0004] Secondly, the isolation function of existing pole-mounted vacuum circuit breakers largely relies on manual operation, requiring maintenance personnel to work on-site. This is not only inefficient but also poses risks of equipment damage and personnel safety. Specifically, when maintenance personnel manually pull the isolating switch, the operating lever may not be perpendicular, leading to uneven force on the three-phase switches. Repeated occurrences of this can cause gradual wear on the isolating switch contacts, potentially resulting in burnout, equipment failure, and a threat to the safety of maintenance personnel. In mountainous or remote areas, or during severe weather (heavy rain, snow, high temperatures), the time and effort required for maintenance personnel to travel back and forth significantly impacts the response speed for fault isolation and line maintenance.

[0005] Therefore, developing a pole-mounted vacuum circuit breaker that combines automatic transformer ratio adjustment and electric opening / closing isolation functions is of great significance for improving the reliability and operation and maintenance efficiency of power distribution systems. In addition, conventional pole-mounted vacuum circuit breakers suffer from limited internal space and inconvenience in installing current transformers; furthermore, during production, installation, or after-sales service, disassembling the top cover can easily lead to stud breakage and thread damage. Summary of the Invention

[0006] The purpose of this invention is to provide a pole-mounted vacuum circuit breaker and its control method, which has both automatic adjustment of the transformer ratio and electric opening and closing isolation functions, in order to solve the problems mentioned in the background art, that existing pole-mounted vacuum circuit breakers cannot adjust the transformer ratio in a timely manner according to load requirements and that the isolation function depends on manual operation.

[0007] This invention is achieved using the following technical solution: A pole-mounted vacuum circuit breaker includes: a circuit breaker body, comprising a housing, an arc-extinguishing chamber module disposed inside the housing, and an operating mechanism for driving the opening and closing of the moving contacts within the arc-extinguishing chamber module; a multi-ratio current transformer for detecting line current; an isolation module disposed on one side of the circuit breaker body for forming a visible disconnection point; an automatic ratio adjustment module, comprising a changeover switch and a first motor for driving the changeover switch to switch taps, the changeover switch being electrically connected to multiple secondary taps of the multi-ratio current transformer; an electrically operated opening and closing isolation module, comprising a motor module for driving the isolation module to operate; and a central control unit, electrically connected to the first motor and the motor module respectively, for controlling the operation of the first motor according to changes in line load to automatically switch the transformer ratio, and controlling the operation of the motor module according to instructions to realize the electrically operated opening and closing of the isolation module.

[0008] The pole-mounted vacuum circuit breaker provided by this invention integrates an automatic transformer ratio adjustment module and an electric closing / opening isolation module, all intelligently managed by a unified central control unit. This achieves a high degree of integration and automation of the two functions, enabling automatic adjustment of the transformer ratio and electric closing / opening isolation. The central control unit can automatically adjust the measurement range based on preset logic and real-time load to ensure measurement accuracy. Simultaneously, it can remotely, safely, and reliably operate the isolation module, greatly improving the intelligence level and maintenance efficiency of the pole-mounted circuit breaker while reducing the risks and costs of manual operation. The circuit breaker body includes core closing and opening components; multi-ratio current transformers provide the basis for ratio adjustment; and the isolation module provides safety assurance during line maintenance.

[0009] Furthermore, the automatic adjustment ratio module also includes a speed reducer I for reducing the output speed of the first motor, and the first motor is connected to the shaft of the changeover switch via the speed reducer I.

[0010] In the above scheme, by setting up reducer I, the high-speed, minute rotation of the first motor can be accurately converted into the low-speed, high-torque rotation required by the shaft of the changeover switch, so as to ensure the accuracy and reliability of the ratio switching.

[0011] Furthermore, the electric combination / disconnection isolation module also includes a speed reducer II for reducing the output speed of the motor module, and the motor module is connected to the push-pull rod of the isolation module through the speed reducer II.

[0012] In the above solution, the setting of reducer II enables the motor module to drive the isolation module smoothly and powerfully, avoiding operation failure or equipment damage caused by excessive impact force or insufficient driving force.

[0013] Furthermore, a mechanical interlocking mechanism and / or an electrical interlocking circuit are provided between the circuit breaker body and the isolation module to ensure that the isolation module can only operate when the circuit breaker body is in the open state.

[0014] In the above scheme, by setting mechanical and / or electrical interlocks (such as the isolating switch cannot be operated when the circuit breaker is not tripped; the circuit breaker cannot be closed when the isolating switch is not in position), the correct operating sequence of the circuit breaker tripping first and the isolating switch operating later is enforced, avoiding the misoperation of opening and closing the isolating switch under load, thereby ensuring personnel safety and preventing arc burns, equipment damage or line short circuits.

[0015] Furthermore, the multi-ratio current transformer is connected to the insulating bushing, and the multi-ratio current transformer and the insulating bushing are an integrated structure; the windings and core of the multi-ratio current transformer are cast onto the outer surface of the insulating bushing.

[0016] In the above solution, the transformer winding is directly cast onto the surface of the insulating bushing to form an integrated bushing structure. This structure simplifies the assembly process inside the circuit breaker, eliminating the cumbersome procedures of inserting and fixing the transformer, thus improving production efficiency. Furthermore, when the transformer needs to be replaced, only the entire integrated bushing needs to be replaced, without disassembling the top cover and the main body of the circuit breaker. This also solves the problems of difficulty in fastening and disassembling the transformer due to space constraints when installing it, and avoids improper installation of the transformer, thus providing great convenience for maintenance work.

[0017] Furthermore, the top opening of the housing is sealed by a top cover, and the top cover and the housing are locked together by at least one latch; at least two sealing rings are provided at the joint between the top cover and the housing, and the latch applies a clamping force to the sealing rings after locking.

[0018] In the above solution, a tower-lock is used instead of the traditional bolt fastening method. During use, simple snap-fitting allows for quick locking and unlocking, significantly reducing the time required to open the top cover during installation and maintenance. This design avoids the problems of thread sticking or damage that easily occur with stainless steel bolts after repeated disassembly and assembly, improving product reliability and ease of maintenance. Furthermore, the design of the sealing ring enhances the reliability of the seal, effectively preventing moisture and impurities from entering the housing. Combined with the uniform clamping force provided by the tower-lock, a durable and reliable sealing effect is ensured under various operating conditions. Furthermore, the operating mechanism drives the moving contact within the arc-extinguishing chamber module via a transmission assembly; the transmission assembly includes a main shaft connected to the operating mechanism, and an insulating pull rod with one end hinged to the main shaft and the other end connected to the moving contact.

[0019] In the above scheme, the energy of the operating mechanism can be accurately and reliably transmitted to the moving contact in the arc-extinguishing chamber module through a transmission assembly consisting of a main shaft and an insulating tie rod, so as to achieve rapid disconnection and reliable closure.

[0020] A control method for a pole-mounted vacuum circuit breaker, using the pole-mounted vacuum circuit breaker described above, includes automatic adjustment of the transformer ratio and electric opening / closing isolation. The automatic adjustment of the transformer ratio includes the following steps: S1: The central control unit monitors the line load current value collected by the multi-ratio current transformer in real time; S2: Compare the current value with the preset transformation ratio switching threshold to determine whether the current transformation ratio is in the optimal measurement range, i.e. whether the current transformation ratio is applicable; S3: If the judgment result is that the current ratio is not applicable, the central control unit issues a control command to start the first motor to drive the changeover switch to rotate to the secondary tap position corresponding to the optimal measurement range, so as to complete the automatic switching of the ratio. The electric opening and closing isolation includes the following steps: A1: The central control unit receives remote or local commands to close or open the isolation module; A2: Before executing the instruction, check the interlocking status of the circuit breaker body and confirm that the arc-extinguishing chamber module is in the open state; A3: The central control unit issues a control command to start the motor module and drive the isolation module to perform closing or opening actions.

[0021] This invention provides an intelligent control method that matches the aforementioned pole-mounted vacuum circuit breaker, enabling the device to realize its functional advantages. The method includes two independent yet related control processes: automatic adjustment of transformer ratio and electric operation isolation. Specifically, by real-time monitoring and intelligent judgment of the load, adaptive adjustment of the transformer ratio is achieved, ensuring continuous accuracy of measurement data. Through command-driven operation and pre-locking checks, safe, remote, and automated operation of the isolation circuit is realized.

[0022] Furthermore, in step S3, the central control unit controls the start and stop of the first motor by controlling the activation or deactivation of a relay; wherein the relay is connected in series with the power supply circuit of the first motor.

[0023] In the above scheme, the central control unit indirectly controls the power supply of the first motor by controlling the on and off of the relay. This is a mature and reliable electrical control method that is easy to implement and has strong anti-interference capabilities.

[0024] Furthermore, the electric opening and closing isolation also includes the following steps: A4: After the isolation module has completed its operation, it sends a position status signal back to the central control unit, and the final status of the isolation module is displayed on the display interface of the central control unit.

[0025] The above solution further improves the operation process of electric isolation and adds a status feedback link. After the isolation module is in place, its position sensor feeds back the status signal to the central control unit to realize closed-loop control of the operation. Maintenance personnel can intuitively see the operation results and confirm the equipment status through the monitoring interface, which improves the reliability of remote operation and the user-friendliness of human-machine interaction.

[0026] The beneficial effects achieved by this invention are: The provided pole-mounted vacuum circuit breaker combines automatic transformer ratio adjustment and electric opening / closing isolation functions, wherein: In the automatic adjustment of transformer ratio, the transformer can dynamically switch to the most suitable range according to the real-time load to ensure high-precision measurement under various loads, thereby providing reliable data support for protection setting calculation, line loss analysis, etc. Furthermore, the switching can be completed automatically through the central control unit without manual intervention. It is especially suitable for pole-mounted equipment in remote areas, complex terrains, or harsh environments, which can significantly reduce the workload of on-site operation and maintenance, in line with the development trend of smart grids with unattended operation and remote maintenance.

[0027] In electric opening and closing isolation, remote opening and closing commands can be issued, reducing the operation response time from hours to minutes in traditional manual on-site operations. This significantly improves the efficiency of fault isolation and line maintenance, and reduces power outage time. Furthermore, it requires no manual intervention and has a simple operation process, making it particularly suitable for unattended transformer substations.

[0028] Furthermore, the integrated design of the multi-ratio current transformer and bushing simplifies production and assembly, avoiding problems such as inadequate tightening due to limited installation space. When the transformer fails, the bushing can be directly replaced, making maintenance extremely convenient. The top cover employs a tower-lock and sealing ring structure, solving the problems of easy damage and unreliable sealing associated with traditional stud fastening methods. It also offers simple and quick installation and excellent sealing performance. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the external assembly structure of the pole-mounted vacuum circuit breaker according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal assembly structure of the pole-mounted vacuum circuit breaker according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the arc-extinguishing chamber module in the pole-mounted vacuum circuit breaker according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the isolation module in the pole-mounted vacuum circuit breaker according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the transmission assembly in the pole-mounted vacuum circuit breaker according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the automatic transformer ratio adjustment module in the pole-mounted vacuum circuit breaker according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the insulating tie rod in the pole-mounted vacuum circuit breaker according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the electrically operated closing and opening isolation module in the pole-mounted vacuum circuit breaker according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the motor module in the pole-mounted vacuum circuit breaker according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the isolation motor mounting bracket in the pole-mounted vacuum circuit breaker according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the top cover structure in the pole-mounted vacuum circuit breaker according to an embodiment of the present invention; Figure 12 This is a schematic diagram showing the installation position of the sealing ring in the pole-mounted vacuum circuit breaker according to an embodiment of the present invention; Figure 13 This is a schematic diagram of the tower latch structure in the pole-mounted vacuum circuit breaker according to an embodiment of the present invention; Figure 14 This is a schematic diagram of the structure of the insulating bushing in the pole-mounted vacuum circuit breaker according to an embodiment of the present invention; In the picture: 1-1. Conductive rod; 1-2. Insulating box; 1-3. Support arm; 1-4. Support; 1-5. Vacuum interrupter; 1-6. Copper nut; 1-7. Conductive clamp; 2-1 Insulating bushing; 2-2 Housing; 2-3 Arc-extinguishing chamber module; 2-4 Multi-ratio current transformer; 3-1. Spindle crank arm; 3-2. Overtravel spring; 3-3. Insulating pull rod; 3-4. Adjusting screw; 4. Isolation module; 4-1. Isolation handle; 4-2. Isolation bracket; 4-3. Insulator; 4-4. Isolation knife holder; 4-5. Isolation knife; 4-6. Connecting seat; 4-7. Push-pull rod; 5-1. Spindle fixing plate; 5-2. Spindle; 5-3. Operating mechanism; 5-4. Automatic adjustment ratio module; 6-1. Changeover switch; 6-2. Changeover switch bracket; 6-3. Sealing cover; 6-4. Motor bracket; 6-5. First motor; 7-1. Mechanism cover; 7-2. Energy storage handle; 7-3. Protective bracket; 7-4. Opening / closing handle; 7-5. Pointer; 8. Electric combination / disconnection isolation module; 8-1. Motor module; 8-2. Isolation motor mounting bracket; 9-1. Outer casing; 9-2. Second motor; 9-3. O-ring seal; 9-4. Reducer II; 9-5. Housing mounting bracket; 9-6. Square sealing gasket; 9-7. Rear plate; 10-1. Top cover; 10-2. Tower lock; 10-3. Sealing ring. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] Example 1 The first aspect of this embodiment provides a pole-mounted vacuum circuit breaker. Please refer to [reference needed]. Figures 1 to 14 It includes an external assembly structure, an internal assembly structure, and a central control unit (not shown in the figure, usually located in a matching controller box). The external assembly structure includes an isolation module 4, and the internal assembly structure includes the circuit breaker body, multi-ratio current transformers 2-4, an automatic ratio adjustment module 5-4, and an electric opening and closing isolation module 8. Specifically in this embodiment: Firstly, the circuit breaker body is the fundamental part for realizing circuit switching and fault current interruption. It includes the housing 2-2 and the top cover 10-1 that seals the opening at the top of the housing 2-2, as well as the arc-extinguishing chamber module 2-3 and the multi-ratio current transformer 2-4 located inside the housing 2-2, and the operating mechanism 5-3 located outside the housing 2-2, etc., wherein: Multiple latches 10-2 are provided between the top cover 10-1 and the housing 2-2, which are evenly distributed along the edge and are used for locking and fixing. Furthermore, at least two sealing rings 10-3 are provided at the joint between the top cover 10-1 and the housing 2-2. After the latches 10-2 are locked, a uniform clamping force is applied to the sealing rings 10-3.

[0032] The main high-voltage components are housed inside the housing 2-2. The high-voltage circuit is introduced from the external line through the insulating bushing 2-1. The multi-ratio current transformer 2-4 is connected to the insulating bushing 2-1, and the multi-ratio current transformer 2-4 and the insulating bushing 2-1 are an integrated structure. The windings and core of the multi-ratio current transformer 2-4 are directly cast onto the outer surface of the insulating bushing 2-1 during manufacturing.

[0033] The arc-extinguishing chamber module 2-3 is the key execution unit of the circuit breaker. It is centered on the vacuum arc-extinguishing chamber 1-5 and has a stationary contact and a moving contact (not shown in the figure). The stationary contact is connected to the upper outgoing terminal through the conductive rod 1-1 and the conductive clamp 1-7. The moving contact is driven by the operating mechanism 5-3 to perform the opening and closing action. The entire vacuum arc-extinguishing chamber 1-5 is fixedly connected to the bracket 1-4 and the bracket crank arm 1-3, and is provided with additional insulation and support by the insulating box 1-2. In addition, copper nuts 1-6 are provided to secure the various conductive components.

[0034] The operating mechanism 5-3 drives the moving contact inside the vacuum interrupter 1-5 via a transmission assembly. The operating mechanism 5-3 is a modular spring operating mechanism 5-3 integrating an energy storage spring, a closing coil, and a opening coil. The transmission assembly includes an insulating pull rod 3-3, a main shaft 5-2, and a main shaft fixing plate 5-1. The output shaft of the operating mechanism 5-3 is connected to the main shaft 5-2, which can rotate under the drive of the operating mechanism 5-3.

[0035] The rotation of the main shaft 5-2 is converted into the linear motion of the insulating rod 3-3 through the main shaft crank arm 3-1. The insulating rod 3-3 is a rod made of high-strength insulating material. One end of it is hinged to the main shaft crank arm 3-1, and the other end is connected to the moving contact in the vacuum interrupter 1-5 through the adjusting screw 3-4. The adjusting screw 3-4 is used to precisely adjust the opening distance and overtravel of the moving contact. The overtravel spring 3-2 is set in the transmission chain, located between the insulating rod 3-3 and the main shaft crank arm 3-1, and is used to provide stable contact pressure after the circuit breaker is closed to ensure low contact resistance.

[0036] When the circuit breaker body is in operation, the closing command will cause the operating mechanism 5-3 to release the closing coil energy to drive the main shaft 5-2 to rotate, and then drive the moving contact to move upward through the transmission component to close with the stationary contact; the opening command will cause the operating mechanism 5-3 to trip, and under the action of the opening coil, the moving contact will move downward quickly, open the arc in the vacuum and extinguish it reliably.

[0037] Secondly, the automatic transformer ratio adjustment module 5-4 is used to realize remote automatic adjustment of the transformer ratio, including the changeover switch 6-1, the first motor 6-5, and the reducer I for reducing the output speed of the first motor 6-5, etc., wherein: Multiple secondary taps of the multi-ratio current transformer 2-4 are connected to the fixed terminals of the changeover switch 6-1 via wires. The changeover switch 6-1 is mounted on the changeover switch bracket 6-2. The first motor 6-5 is mounted on the motor bracket 1-4, and its output shaft is connected to the rotating shaft of the changeover switch 6-1 via a reducer I and a connector to drive the changeover switch 6-1 to switch the taps. The first motor 6-5 is protected by a sealed cover 6-3 to prevent external environmental influences.

[0038] The central control unit is electrically connected to the first motor 6-5 and is used to control the operation of the first motor 6-5 according to changes in line load to automatically switch the transformer ratio.

[0039] When the aforementioned automatic ratio adjustment module 5-4 is in operation: when the central control unit detects a change in line load and determines that the measurement range needs to be adjusted, it will send a command to the first motor 6-5 to drive it to rotate precisely at a certain angle, thereby driving the changeover switch 6-1 to switch to the appropriate tap, thus completing the automatic adjustment of the ratio.

[0040] Thirdly, the electric closing / opening isolation module 8 is used to realize the remote electric operation of the isolating switches 4-5, including the motor module 8-1 for driving the isolation module 4 and the reducer II 9-4 for reducing the output speed of the motor module 8-1, etc., wherein: The isolating module 4 is located on one side of the circuit breaker body and mounted on the isolating bracket 1-4. It is the visible disconnecting part of the circuit breaker and is used to form a visible disconnecting point. Specifically, it includes an isolating knife holder 4-4 (corresponding to the stationary contact) fixed on the insulator 4-3 and a rotatable isolating knife 4-5 (corresponding to the moving contact). The isolating knife 4-5 is connected to the operating mechanism 5-3 through a connecting seat 4-6 and a push-pull rod 4-7. In manual mode, the opening and closing can be operated through the isolating handle 4-1. A mechanical interlocking mechanism and / or an electrical interlocking circuit are provided between the circuit breaker body and the isolating module 4 to ensure that the isolating module 4 can only operate when the circuit breaker body is in the open state.

[0041] To achieve electrification, an electric combination / disconnection isolation module 8 is added to the transmission link of the isolation module 4. The motor module 8-1 in the electric combination / disconnection isolation module 8 is mounted on the isolation motor mounting bracket 1-4. The core of the motor module 8-1 is a power unit consisting of a second motor 9-2 and a reducer II 9-4. This power unit is encapsulated in a waterproof housing consisting of an outer cover 9-1 and a rear plate 9-7. The waterproof housing is supported by a housing mounting bracket 9-5 and sealed by an O-ring 9-3 and a square gasket 9-6. The power cord is introduced through a waterproof connector.

[0042] The central control unit is electrically connected to the motor module 8-1 and is used to control the operation of the motor module 8-1 according to the instructions to realize the electric opening and closing of the isolation module 4.

[0043] When the above-mentioned electric closing and opening isolation module 8 is working: after the central control unit confirms that the circuit breaker body has been opened (through electrical or mechanical interlocking), it supplies power to the motor module 8-1; after the power of the second motor 9-2 is reduced in speed and increased in torque by the reducer II 9-4, it will drive the push-pull rod 4-7 of the isolation module 4 to move, thereby smoothly and reliably driving the isolation knife 4-5 to perform closing or opening movements synchronously.

[0044] In addition, the external assembly structure also provides interfaces for maintenance personnel to perform on-site operations and status observation, including mechanism cover 7-1, energy storage handle 7-2, protective bracket 7-3, opening and closing handle 7-4, pointer 7-5, etc., among which: The mechanism cover 7-1 is used to protect the operating mechanism 5-3 below from wind and rain erosion; the energy storage handle 7-2 is used to manually store energy for the closing coil of the operating mechanism 5-3 in the event of no power or emergency; the protective bracket 7-3 is used to provide certain mechanical protection for external protruding parts; the opening and closing handle 7-4 is used to manually open or close the circuit breaker; the pointer 7-5 is linked to the main shaft 5-2 and is used to visually indicate whether the circuit breaker is in the closed or open position, which is an important status indicator.

[0045] The second aspect of this embodiment provides a control method for a pole-mounted vacuum circuit breaker, which uses the pole-mounted vacuum circuit breaker described above, including automatic adjustment of the transformer ratio and electric opening and closing isolation.

[0046] The automatic adjustment of the transformer ratio includes the following steps: S1: The line load current value collected by the multi-ratio current transformers 2-4 is monitored in real time through the central control unit; S2: Compare the current value with the preset transformation ratio switching threshold to determine whether the current transformation ratio is in the optimal measurement range, i.e. whether the current transformation ratio is applicable; S3: If the judgment result indicates that the current transformation ratio is not applicable, the central control unit issues a control command to start the first motor 6-5 and drive the changeover switch 6-1 to rotate to the secondary tap position corresponding to the optimal measurement range, thereby completing the automatic switching of the transformation ratio. In this step, the central control unit controls the start and stop of the first motor 6-5 by controlling the engagement or disengagement of the relay; wherein, the relay and the power supply circuit of the first motor 6-5 are connected in series.

[0047] The electric opening and closing isolation includes the following steps: A1: The central control unit receives remote or local closing or opening commands from the isolation module 4; A2: Before executing the instruction, check the interlocking status of the circuit breaker body and confirm that the arc-extinguishing chamber module 2-3 is in the open state; A3: The central control unit issues a control command to start the motor module 8-1 and drive the isolation module 4 to perform closing or opening actions; A4: After the isolation module 4 has completed its operation, it sends a position status signal to the central control unit via the position sensor, and the final status of the isolation module 4 is displayed on the central control unit's display interface.

[0048] In summary, this embodiment, through the organic combination and innovative design of the above-mentioned functional modules, constitutes a fully functional, high-performance, and highly intelligent integrated pole-mounted circuit breaker. It not only possesses the basic functions of a traditional circuit breaker, but also improves measurement accuracy through automatic ratio adjustment, enhances operational safety and efficiency through electric isolation, and fully considers production convenience and maintenance ease in its structural design.

[0049] It should be noted that the parts not described in detail or in elaboration in the above solutions are all prior art and do not constitute improvements made by this invention to existing technology, nor are they within the protection scope of this invention's technical solutions. Therefore, they will not be elaborated upon further in this document. Of course, the above content is merely a preferred embodiment of this invention and should not be considered as limiting the scope of the embodiments of this invention. This invention is also not limited to the above examples; equivalent changes and improvements made by those skilled in the art within the substantial scope of this invention should all fall within the patent coverage of this invention.

Claims

1. A pole-mounted vacuum circuit breaker, characterized in that, include: The circuit breaker body includes a housing (2-2), an arc-extinguishing chamber module (2-3) disposed inside the housing (2-2), and an operating mechanism (5-3) for driving the opening and closing of the moving contacts inside the arc-extinguishing chamber module (2-3); Multi-ratio current transformers (2-4) are used to detect line current; An isolation module (4) is provided on one side of the circuit breaker body to form a visible disconnection point; The automatic ratio adjustment module (5-4) includes a changeover switch (6-1) and a first motor (6-5) for driving the changeover switch (6-1) to switch taps. The changeover switch (6-1) is electrically connected to a plurality of secondary taps of the multi-ratio current transformer (2-4). The electric combination and separation isolation module (8) includes a motor module (8-1) for driving the isolation module (4) to operate; The central control unit is electrically connected to the first motor (6-5) and the motor module (8-1) respectively. It is used to control the first motor (6-5) to automatically switch the transformer ratio according to the changes in line load, and to control the motor module (8-1) to realize the electric opening and closing of the isolation module (4) according to the instructions.

2. The pole-mounted vacuum circuit breaker according to claim 1, characterized in that: The automatic adjustment ratio module (5-4) further includes a speed reducer I for reducing the output speed of the first motor (6-5), and the first motor (6-5) is connected to the shaft of the changeover switch (6-1) via the speed reducer I.

3. The pole-mounted vacuum circuit breaker according to claim 1, characterized in that: The electric combination and separation isolation module (8) also includes a speed reducer II (9-4) for reducing the output speed of the motor module (8-1). The motor module (8-1) is connected to the push-pull rod (4-7) of the isolation module (4) through the speed reducer II (9-4).

4. The pole-mounted vacuum circuit breaker according to claim 1, characterized in that: A mechanical interlocking mechanism and / or an electrical interlocking circuit are provided between the circuit breaker body and the isolation module (4) to ensure that the isolation module (4) can only operate when the circuit breaker body is in the open state.

5. The pole-mounted vacuum circuit breaker according to claim 1, characterized in that: The multi-ratio current transformer (2-4) is connected to the insulating bushing (2-1), and the multi-ratio current transformer (2-4) and the insulating bushing (2-1) are an integrated structure; the windings and core of the multi-ratio current transformer (2-4) are cast on the outer surface of the insulating bushing (2-1).

6. The pole-mounted vacuum circuit breaker according to claim 1, characterized in that: The top opening of the housing (2-2) is sealed by the top cover (10-1), and the top cover (10-1) and the housing (2-2) are locked and fixed by at least one latch (10-2); At least two sealing rings (10-3) are provided at the joint between the top cover (10-1) and the housing (2-2). After the tower lock (10-2) is locked, it applies a clamping force to the sealing rings (10-3).

7. The pole-mounted vacuum circuit breaker according to claim 1, characterized in that: The operating mechanism (5-3) drives the moving contact in the arc-extinguishing chamber module (2-3) through a transmission assembly; the transmission assembly includes a main shaft (5-2) connected to the operating mechanism (5-3) and an insulating pull rod (3-3) with one end hinged to the main shaft (5-2) and the other end connected to the moving contact.

8. A control method for a pole-mounted vacuum circuit breaker, using the pole-mounted vacuum circuit breaker as described in any one of claims 1-7, characterized in that: This includes automatic adjustment of the transformer ratio and electric opening and closing isolation; The automatic adjustment of the transformer ratio includes the following steps: S1: The central control unit monitors the line load current value collected by the multi-ratio current transformer (2-4) in real time; S2: Compare the current value with the preset transformation ratio switching threshold to determine whether the current transformation ratio is in the optimal measurement range, i.e. whether the current transformation ratio is applicable; S3: If the judgment result is that the current ratio is not applicable, the central control unit issues a control command to start the first motor (6-5) to drive the changeover switch (6-1) to rotate to the secondary tap position corresponding to the optimal measurement range, so as to complete the automatic switching of the ratio; The electric opening and closing isolation includes the following steps: A1: The central control unit receives the closing or opening command from the remote or local isolation module (4); A2: Before executing the instruction, check the locking status of the circuit breaker body and confirm that the arc-extinguishing chamber module (2-3) is in the open state; A3: The central control unit issues a control command to start the motor module (8-1) to drive the isolation module (4) to perform closing or opening actions.

9. The control method for a pole-mounted vacuum circuit breaker according to claim 8, characterized in that: In step S3, the central control unit controls the start and stop of the first motor (6-5) by controlling the activation or deactivation of the relay; wherein the relay is connected in series with the power supply circuit of the first motor (6-5).

10. The control method for a pole-mounted vacuum circuit breaker according to claim 8, characterized in that: The electric connection / disconnection isolation also includes the following steps: A4: After the isolation module (4) is in position, it sends a position status signal to the central control unit, and the final status of the isolation module (4) is displayed on the display interface of the central control unit.

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