Intelligent high-voltage switch cabinet and control method thereof

Abstract

The application relates to the technical field of high-voltage circuit breakers, in particular to an intelligent high-voltage switch cabinet and a control method thereof. The intelligent high-voltage switch cabinet is provided with a standby driving mechanism and a control assembly. The standby driving mechanism is used for driving the first moving contact to be close to or far away from the first stationary contact when the energy storage device or the opening spring fails. The control assembly comprises a first position sensor and a microprocessor. In the process of opening or closing, the first position sensor sends the position of the first moving contact to the microprocessor, and the microprocessor judges whether the opening or closing is completed according to the position of the first moving contact. When the energy storage device or the connecting rod mechanism fails to normally close the first moving contact, the microprocessor controls the standby driving mechanism to drive the first moving contact to be far away from or close to the first stationary contact, thereby completing the closing or opening action, avoiding long-time electric arc between the two contacts, and protecting the contacts and the high-voltage circuit breaker.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage circuit breakers, in particular to an intelligent high-voltage switch cabinet and a control method thereof. BACKGROUND

[0002] A high-voltage switch cabinet is a device for controlling the on-off of a high-voltage alternating current circuit, and the most critical component thereof is a high-voltage circuit breaker. A high-voltage circuit breaker refers to a circuit breaker with a voltage level exceeding 3kV in a power system, which is widely used in various aspects of power generation, transmission and transformation and plays a crucial role. The high-voltage circuit breaker can connect and disconnect the circuit according to the operating mode under normal conditions, and can quickly remove the faulty equipment according to the secondary protection signal when a fault occurs or connect the circuit to restore power supply after the transient fault is eliminated, thereby having the dual functions of control and protection. The moving contact of the high-voltage circuit breaker is usually controlled by a connecting rod mechanism, which is driven by an energy storage device to drive the connecting rod mechanism to contact the moving contact with the static contact when closing, and is driven by an opening spring to drive the connecting rod mechanism to separate the moving contact from the static contact when opening. Since the connecting rod mechanism is a complex mechanical linkage structure with complex coordination, it is prone to failure. Moreover, the commonly used high-voltage switch cabinet uses a mechanical button to control the movement of the energy storage device. In actual operation, abnormalities in the high-voltage circuit breaker body, operating mechanism and transmission mechanism will cause the circuit breaker to fail to normally open and close, and even cause the scope of the fault to expand, thereby threatening the safety and stability of the power system.

[0003] The high-voltage circuit breakers currently in use are mostly manually operated in the field, and once a fault occurs in the circuit breaker, it may cause personal injury. Although there are related technologies of automatic high-voltage switch cabinets, they all use open-loop control, and the contacts of the circuit breaker are usually enclosed in a sealed tank, so the actual position of the contacts cannot be directly judged by the workers. For a high-voltage alternating current circuit, a certain reaction time is needed to see the result after the line is disconnected, and the workers cannot take emergency measures according to the actual opening and closing of the high-voltage circuit breaker contacts. During the opening or closing process of the circuit breaker, if the contacts are not moved to the position, for example, completely contact or completely separate, an electric arc will be generated between the two contacts, and if necessary measures are not taken in time, the contacts will be burned out, which may even lead to a safety accident. SUMMARY

[0004] In order to solve the technical problem that the existing technology cannot perform closed-loop control according to the actual position of the circuit breaker contacts, the present application provides an intelligent high-voltage switch cabinet and a control method thereof.

[0005] The intelligent high-voltage switch cabinet comprises a high-voltage circuit breaker, wherein the high-voltage circuit breaker comprises an arc-extinguishing chamber, a first movable contact, a first stationary contact, a backup driving mechanism and a control assembly. The first stationary contact is fixed in the arc-extinguishing chamber, the first movable contact is accommodated in the arc-extinguishing chamber, the first movable contact can be close to or away from the first stationary contact, and the backup driving mechanism is used for driving the first movable contact to contact or be away from the second stationary contact. The control assembly comprises a first position sensor and a microprocessor, the first position sensor is used for measuring the distance between the first contact and the first stationary contact, the first position sensor is electrically connected with the microprocessor, and the microprocessor is electrically connected with the driving mechanism.

[0006] In the process of opening or closing, the first position sensor sends the position information of the first movable contact to the microprocessor, and the microprocessor judges whether the opening or closing action is completed according to the position of the first movable contact. When the energy storage device or the connecting rod mechanism fails to normally close the first movable contact, the microprocessor controls the backup driving mechanism to act, drives the first movable contact to be away from or close to the first stationary contact, completes the closing or opening action, avoids long-time electric arc between the two contacts, and thus protects the contacts and the high-voltage circuit breaker.

[0007] Specifically, the high-voltage circuit breaker further comprises a movable contact connecting shaft, one end of the first movable contact extends out of the arc-extinguishing chamber and is connected with the movable contact connecting shaft.

[0008] The backup driving mechanism comprises a movable contact lever, a cylinder and a control loop. The movable contact lever is provided with a limiting sliding groove in the length direction, the movable contact connecting shaft penetrates through the limiting sliding groove and can slide along the limiting sliding groove, and one end of the movable contact lever is fixedly connected with a piston of the cylinder. The inside of the cylinder has a first chamber and a second chamber on the two sides of the piston respectively; the control loop comprises a gas source and a reversing valve, the reversing valve is electrically connected with the microprocessor, and the reversing valve is used for supplying the gas source with gas to the first chamber or the second chamber, so that the piston moves in different directions, thereby driving the movable contact lever to move, and driving the first movable contact to be close to or away from the first stationary contact. The cylinder serves as the power source of the backup driving mechanism, the cylinder has large output thrust, simple structure and high reliability.

[0009] Specifically, the first position sensor is an optical sensor, the first position sensor is fixedly connected with the first movable contact, and the first position sensor is perpendicular to the outer wall of the arc-extinguishing chamber, so that the first position sensor can receive the reflected laser signal from the outer wall of the arc-extinguishing chamber, determine the position of the first movable contact according to the reflected laser, and send the position information to the microprocessor, so as to judge whether the high-voltage circuit breaker is closed in place or opened in place according to the position information of the first position sensor.

[0010] Further, the intelligent high-voltage switch cabinet further comprises a cabinet body, a handcart and a ground knife. The cabinet body is used for accommodating the high-voltage circuit breaker, the handcart and the ground knife. The handcart is used for moving the high-voltage circuit breaker. The ground knife comprises second movable contacts and second stationary contacts which can be close to or away from each other, the second movable contacts are connected with the high-voltage circuit breaker, the cabinet body and a ground wire, and the second stationary contacts are connected with a main line.

[0011] The control assembly further comprises a second position sensor, a third position sensor, a fourth position sensor and a pressure sensor. The second position sensor is used for transmitting position information of the second movable contacts to the microprocessor, the third position sensor is used for transmitting position information of the handcart to the microprocessor, the fourth position sensor is used for transmitting position information of the energy storage spring to the microprocessor, and the pressure sensor is used for transmitting air pressure information in the arc extinguishing chamber to the microprocessor. The second position sensor, the third position sensor, the fourth position sensor and the pressure sensor are all electrically connected with the microprocessor. Before performing an opening or closing action, the state of the ground knife, the handcart, the energy storage device and the arc extinguishing chamber is judged by the second position sensor, the third position sensor, the fourth position sensor and the pressure sensor respectively, so as to judge whether the high-voltage circuit breaker can perform the opening or closing action, thereby improving the automation and safety.

[0012] Further, the control assembly further comprises a first temperature sensor, which is used for measuring the temperature of the first movable contact, and the first temperature sensor is electrically connected with the microprocessor. The first temperature sensor can measure the temperature of the first movable contact during daily use, so as to analyze the resistance change of the first movable contact and further judge the wear condition of the first movable contact after long-term use. The temperature of the first movable contact can also be measured during the opening or closing process, so as to judge whether the first movable contact is burned out.

[0013] Further, the control assembly further comprises a second temperature sensor, a humidity sensor and a heating device. The second temperature sensor is used for measuring the temperature inside the cabinet body, the humidity sensor is used for measuring the humidity inside the cabinet body, and the heating device is used for increasing the temperature inside the cabinet body. The second temperature sensor, the humidity sensor and the heating device are all electrically connected with the microprocessor. The high-voltage switch cabinet has certain requirements on the temperature and humidity of the use environment. When the use environment is low temperature and humid, the temperature sensor, the humidity sensor and the heating device need to be arranged in the high-voltage switch cabinet to timely control the temperature inside the high-voltage switch cabinet, so as to prevent water droplets from appearing inside the cabinet body due to low temperature and high humidity.

[0014] Further, the control assembly further comprises an arc light sensor for detecting an arc light inside the cabinet, the arc light sensor being electrically connected to the microprocessor. When a short circuit occurs in the high-voltage circuit due to a short circuit of a live component in the cabinet, a short-circuit discharge phenomenon occurs. The arc light sensor can measure the arc light in the cabinet in a timely manner and send a signal to the microprocessor, so that the microprocessor can send prompt information to the manager in a timely manner to protect the safety of the equipment.

[0015] Further, the control assembly further comprises a smoke sensor for detecting smoke inside the cabinet, the smoke sensor being electrically connected to the microprocessor. When the live component in the cabinet overheats due to a short circuit or overcurrent, smoke may be generated. The smoke sensor can sense the smoke in the cabinet in a timely manner and send a signal to the microprocessor, so that the microprocessor can send prompt information to the manager in a timely manner or take necessary actions to protect the safety of the equipment.

[0016] The application also provides an intelligent high-voltage switch cabinet control method for controlling the intelligent high-voltage switch cabinet of claim 8, the control method comprising the following steps:

[0017] S1: receiving an action instruction;

[0018] S2: performing a safety state check, if the safety state does not satisfy the execution action condition, sending a safety state prompt information, and terminating the execution action;

[0019] S3: executing the action instruction and starting timing;

[0020] S4: when the timing reaches a first time threshold, judging whether the first moving contact reaches an open position or a closed position;

[0021] S5: according to the output result of step S4, if the first moving contact has reached the open position or the closed position, sending an action completion prompt information, if the first moving contact has not reached the open position or the closed position, the microprocessor controls the standby drive mechanism to act, drives the first moving contact away from or re-touches the first stationary contact, and sends a fault prompt information.

[0022] Through this control method, closed-loop control of the opening or closing action of the high-voltage circuit breaker can be realized, and the automation level of the high-voltage switch cabinet is improved. At the same time, safety checks are performed before the opening or closing, which can effectively avoid safety accidents and improve the safety of the intelligent high-voltage switch cabinet.

[0023] Further, in step S2 of the control method, the safety state check is divided into a closing safety check and an opening safety check. The closing safety check comprises the following steps:

[0024] S211: judging whether the ground cutter is in the disconnected position;

[0025] S212: judging whether the pressure value of the arc extinguishing chamber meets the requirement of performing action;

[0026] S213: judging whether the handcart reaches the working position;

[0027] S214: judging whether the energy storage device completes energy storage;

[0028] S215: judging whether the closing instruction is misoperation;

[0029] The opening safety check comprises the following steps:

[0030] S221: judging whether the pressure value of the arc extinguishing chamber meets the requirement of performing action;

[0031] S222: judging whether the opening instruction is misoperation.

[0032] Through the above safety check steps, the "five-prevention" check can be completed before performing the opening or closing action, unnecessary safety accidents are avoided, and the safety of the intelligent high-voltage switch cabinet is improved.

[0033] Technical effects and advantages of the present application:

[0034] 1. By setting the first position sensor and the microprocessor, the position of the first moving contact during the opening or closing process is measured, and whether the high-voltage circuit breaker completes the closing or opening action is judged, so that the closed-loop control of the high-voltage circuit breaker is realized.

[0035] 2. By setting the standby driving mechanism, the first moving contact is driven to act when the energy storage device or the connecting rod mechanism fails, the closing or opening action is completed, the long-time electric arc between the first moving contact and the first stationary contact is avoided, and further, the burning of the contact or even more serious accidents are avoided.

[0036] 3. By setting multiple position sensors, pressure sensors and temperature sensors, the "five-prevention" check before performing the opening or closing action is realized, and the running device of the intelligent high-voltage switch cabinet is detected in real time, so that the automation degree and safety of the intelligent high-voltage switch cabinet are improved. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a cross-sectional view of the high-voltage circuit breaker in the first embodiment of the present application;

[0038] Figure 2 is a partial perspective view of the high-voltage circuit breaker in the first embodiment of the present application;

[0039] Figure 3A schematic diagram of a backup drive mechanism in a first embodiment of the present application;

[0040] Figure 4 A front view of an intelligent high-voltage switch cabinet provided by a second embodiment of the present application;

[0041] Figure 5 A flowchart of a control method provided by a third embodiment of the present application.

[0042] The reference signs are: 1, a high-voltage circuit breaker; 11, an arc extinguishing chamber; 12, a first moving contact; 13, a first stationary contact; 14, a backup drive mechanism; 141, a moving contact lever; 1411, a limiting sliding groove; 142, a pneumatic cylinder; 1421, a piston; 1422, a first chamber; 1423, a second chamber; 143, a control circuit; 1431, a gas source; 1432, a reversing valve; 15, a control assembly; 151, a first position sensor; 152, a microprocessor; 153, a second position sensor; 154, a third position sensor; 155, a fourth position sensor; 156, a pressure sensor; 157, a first temperature sensor; 158, a second temperature sensor; 159, a humidity sensor; 1510, a heating device; 1511, an arc light sensor; 1512, a smoke sensor; 16, a moving contact connecting shaft; 2, a cabinet body; 3, a handcart; 4, a ground knife; 41, a second moving contact; 42, a second stationary contact. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] Embodiment one

[0045] Reference Figures 1 to 3 The first embodiment of the present application provides an intelligent high-voltage switch cabinet, which comprises a high-voltage circuit breaker 1. The high-voltage circuit breaker 1 comprises an arc extinguishing chamber 11, a first moving contact 12, a first stationary contact 13, a backup drive mechanism 14, and a control assembly 15. The first stationary contact 13 is fixed in the arc extinguishing chamber 11, the first moving contact 12 is accommodated in the arc extinguishing chamber 11, the first moving contact 12 can be close to or away from the first stationary contact 13, the backup drive mechanism 14 is used to drive the first moving contact 12 to abut or be away from the second stationary contact 42. The control assembly 15 comprises a first position sensor 151 and a microprocessor 152, the first position sensor 151 is used to measure the distance between the first moving contact 12 and the first stationary contact 13, the first position sensor 151 is electrically connected with the microprocessor 152, and the microprocessor 152 is electrically connected with the drive mechanism.

[0046] In the process of opening or closing, the first position sensor 151 sends the position information of the first moving contact 12 to the microprocessor 152, and the microprocessor 152 judges whether the opening or closing action is completed according to the position of the first moving contact 12. When the energy storage device or the connecting rod mechanism fails to normally abut the first moving contact 12 and the first stationary contact 13, the microprocessor 152 controls the backup driving mechanism 14 to act, drives the first moving contact 12 away from or close to the first stationary contact 13, and completes the closing or opening action, thereby avoiding long-time electric arc between the two contacts, and protecting the contacts and the high-voltage circuit breaker 1.

[0047] The connecting rod mechanism, energy storage mechanism and other components in the high-voltage circuit breaker 1 have different specific structures and design details due to different manufacturers or models of high-voltage switch cabinets, but have the same basic principle, which is not improved in the present application, and is not limited in the drawings of the present application, and unnecessary limitations are also avoided.

[0048] The backup driving mechanism 14 can adopt various driving modes, for example, a gear and rack can be arranged at one end of the first moving contact 12 extending from the arc extinguishing chamber 11 to drive, or an electromagnet can be used as an action mechanism to drive the first moving contact 12 to approach or move away from the first stationary contact 13 by changing the direction of current in the electromagnet. The present application uses a pneumatic cylinder 142 as a power source of the backup driving mechanism 14, which has large output thrust, simple structure and high reliability.

[0049] In the first embodiment of the present application, as shown in Figure 2 and Figure 3 The high-voltage circuit breaker 1 further comprises a moving contact connecting shaft 16, one end of the first moving contact 12 extending from the arc extinguishing chamber 11 is connected with the moving contact connecting shaft 16. The backup driving mechanism 14 comprises a moving contact lever 141, a pneumatic cylinder 142 and a control circuit 143. The moving contact lever 141 is provided with a limiting sliding groove 1411 along the length direction, the moving contact connecting shaft 16 is arranged in the limiting sliding groove 1411 and can slide along the limiting sliding groove 1411, and one end of the moving contact lever 141 is fixedly connected with a piston 1421 of the pneumatic cylinder 142. The inside of the pneumatic cylinder 142 is divided into a first chamber 1422 and a second chamber 1423 by the piston 1421. The control circuit 143 comprises a gas source 1431 and a reversing valve 1432, the reversing valve 1432 is electrically connected with the microprocessor 152, and the reversing valve 1432 is used for supplying the gas source 1431 to the first chamber 1422 or the second chamber 1423 to make the piston 1421 move in different directions, thereby driving the moving contact lever 141 to move to drive the first moving contact 12 to approach or move away from the first stationary contact 13.

[0050] In normal state, the position of the moving contact lever 141 is fixed, and the moving contact connecting shaft 16 can freely slide along the limiting sliding groove 1411. When the first moving contact 12 is in the closed position, the moving contact connecting shaft 16 is at the upper end of the limiting sliding groove 1411. When the first moving contact 12 is in the open position, the moving contact connecting shaft 16 is at the lower end of the limiting sliding groove 1411.

[0051] In the opening process, if the first moving contact 12 does not move to the open position, that is, the opening spring or the linkage mechanism fails, which means that the first moving contact 12 cannot continue to move to the open position. If the standby driving mechanism 14 forcibly drives the first moving contact 12 to continue the opening action, it may cause secondary damage to the opening spring or the linkage mechanism. Therefore, at this time, the control assembly 15 controls the reversing valve 1432 to switch the working position, so that the gas source 1431 supplies gas to the second chamber 1423, the piston 1421 drives the moving contact lever 141 to move upward, so that the lower end of the limiting sliding groove 1411 drives the moving contact connecting shaft 16 to move to the closed position, so that the first moving contact 12 recontacts with the first stationary contact 13, avoiding long-time arc between the two contacts, thereby protecting the contacts and the circuit breaker. When the maintenance personnel overhauls, they can cut off the power supply by operating other circuit breakers in the circuit, and then overhaul the circuit breaker.

[0052] The closing process is the same as the opening process. If the first moving contact 12 does not move to the closed position, that is, the energy storage mechanism or the linkage mechanism fails, which means that the first moving contact 12 cannot continue to move to the closed position. The control assembly 15 controls the reversing valve 1432 to switch the working position, so that the gas source 1431 supplies gas to the first chamber 1422, the piston 1421 drives the moving contact lever 141 to move downward, so that the upper end of the limiting sliding groove 1411 drives the moving contact connecting shaft 16 to move to the open position, so that the first moving contact 12 is away from the first stationary contact 13, avoiding long-time arc between the two contacts, thereby protecting the contacts and the circuit breaker.

[0053] Of course, for some simple structure or automatic high-voltage circuit breaker 1, the linkage mechanism is not provided, and the energy storage device and the opening spring directly drive the first moving contact 12. When a fault occurs and the first moving contact 12 cannot be actuated to the position, the gas cylinder 142 can drive the moving contact lever 141 to continue the opening or closing action. The corresponding reversing valve 1432 and the gas supply circuit wiring mode also need to be adjusted according to the specific situation.

[0054] The gas source 1431 can adopt an air compressor or a gas storage tank.

[0055] The reversing valve 1432 can adopt various types, and in the first embodiment of the present application, a three-position four-way electromagnetic reversing valve 1432 is adopted, which is a commonly used reversing valve 1432 in a pneumatic control system, and has four switching ports and three working positions, and can be connected to different pneumatic elements. The electromagnet of the reversing valve 1432 can be remotely controlled by the control assembly 15, which is convenient for automatic control. In actual use, other reversing valves 1432 can also be used, such as a manual reversing valve 1432, or a reversing valve 1432 with more switching ports or working positions, to realize more functions.

[0056] The first position sensor 151 can adopt various types of sensors, such as a gear rack plus absolute value encoder, which can realize measurement of the position of the first moving contact 12. Alternatively, two micro switches can be used, the first micro switch is used to send a signal to the microprocessor 152 when the first moving contact 12 reaches the closed position, and the second micro switch is used to send a signal to the microprocessor 152 when the first moving contact 12 reaches the open position.

[0057] In the first embodiment of the present application, as shown in Figure 1 The first position sensor 151 adopts an optical sensor, the first position sensor 151 is fixedly connected with the first moving contact 12, and the first position sensor 151 is perpendicular to the outer wall of the arc extinguishing chamber 11, so that the first position sensor 151 can receive the reflected laser signal from the outer wall of the arc extinguishing chamber 11, and determine the position of the first moving contact 12 according to the reflected laser, and send the position information to the microprocessor 152, and determine whether the high-voltage circuit breaker 1 is closed to position or opened to position according to the position information of the first position sensor 151.

[0058] In order to improve the measurement accuracy of the first position sensor 151, a reflector can also be arranged on the outer wall of the arc extinguishing chamber 11 to enhance the intensity of the reflected laser signal received by the first position sensor 151.

[0059] In the first embodiment of the present application, the microprocessor 152 can adopt a DSP+ARM dual-processor architecture. Various signals can be analyzed and processed, and relatively complex control logic can be run, so that the control of the high-voltage circuit breaker 1 is intelligentized.

[0060] Embodiment Two

[0061] As Figure 4As shown, the second embodiment of the present application is a further improvement on the first embodiment, and on the basis of the first embodiment, the intelligent high-voltage switch cabinet further comprises a cabinet body 2, a handcart 3 and a ground knife 4. The cabinet body 2 is used for accommodating the high-voltage circuit breaker 1, the handcart 3 and the ground knife 4. The handcart 3 is used for moving the high-voltage circuit breaker 1. The ground knife 4 comprises a second moving contact 41 and a second stationary contact 42 which can approach or move away from each other, the second moving contact 41 is connected with the high-voltage circuit breaker 1, the cabinet body 2 and a ground wire, and the second stationary contact 42 is connected with a main line.

[0062] The control assembly 15 further comprises a second position sensor 153, a third position sensor 154, a fourth position sensor 155 and a pressure sensor 156. The second position sensor 153 is used for transmitting position information of the second moving contact 41 to the microprocessor 152, the third position sensor 154 is used for transmitting position information of the handcart 3 to the microprocessor 152, the fourth position sensor 155 is used for transmitting position information of the energy storage spring to the microprocessor 152, and the pressure sensor 156 is used for transmitting air pressure information in the arc extinguishing chamber 11 to the microprocessor 152. The second position sensor 153, the third position sensor 154, the fourth position sensor 155 and the pressure sensor 156 are all electrically connected with the microprocessor 152. Before performing the opening or closing action, the state of the ground knife 4, the handcart 3, the energy storage device and the arc extinguishing chamber 11 is judged by the second position sensor 153, the third position sensor 154, the fourth position sensor 155 and the pressure sensor 156 respectively, so as to judge whether the high-voltage circuit breaker 1 can perform the opening or closing action, thereby improving the automation and the safety.

[0063] The second position sensor 153, the third position sensor 154 and the fourth position sensor 155 can adopt a travel limit switch or an optical sensor. The travel limit switch reflects whether the equipment moves to the specified position by outputting the switch quantity, has simple structure, low cost and high reliability, but cannot accurately reflect the specific position of the measured object. The optical sensor can measure the specific position of the measured object in real time, has high sensitivity and high degree of automation. In the second embodiment of the present application, the second position sensor 153, the third position sensor 154 and the fourth position sensor 155 all adopt the optical sensor, which can accurately measure the positions of the ground knife 4 and the handcart 3.

[0064] The pressure sensor 156 needs to adopt different sensors according to the type of the arc extinguishing chamber 11. If it is a vacuum arc extinguishing chamber 11, a negative pressure sensor 156 needs to be adopted. If it is an SF6 (sulfur hexafluoride) arc extinguishing chamber 11, a special positive pressure sensor 156 needs to be adopted.

[0065] Further, the control assembly 15 further comprises a first temperature sensor 157 for measuring the temperature of the first movable contact 12, and the first temperature sensor 157 is electrically connected to the microprocessor 152. The first temperature sensor 157 can measure the temperature of the first movable contact 12 during daily use, so as to analyze the resistance change of the first movable contact 12, and further judge the wear condition of the first movable contact 12 after long-term use. The temperature of the first movable contact 12 can also be measured during the opening or closing process, so as to judge whether the first movable contact 12 is burned out.

[0066] Further, the control assembly 15 further comprises a second temperature sensor 158, a humidity sensor 159, and a heating device 1510. The second temperature sensor 158 is used for measuring the temperature inside the cabinet 2, the humidity sensor 159 is used for measuring the humidity inside the cabinet 2, and the heating device 1510 is used for increasing the temperature inside the cabinet 2. The second temperature sensor 158, the humidity sensor 159, and the heating device 1510 are all electrically connected to the microprocessor 152. The high-voltage switch cabinet has certain requirements for the temperature and humidity of the use environment. When the use environment is low temperature and humid, the temperature sensor, the humidity sensor 159, and the heating device 1510 need to be arranged in the high-voltage switch cabinet to timely control the temperature inside the high-voltage switch cabinet, so as to prevent water droplets from appearing inside the cabinet 2 due to low temperature and high humidity.

[0067] Further, the control assembly 15 further comprises an arc sensor 1511 for measuring the arc inside the cabinet 2, and the arc sensor 1511 is electrically connected to the microprocessor 152. When the short circuit of the live parts in the cabinet 2 occurs, the high-voltage circuit will have a short-circuit discharge phenomenon. The arc sensor 1511 can timely measure the arc inside the cabinet 2 and send a signal to the microprocessor 152, so that the microprocessor 152 can timely send a prompt information to the manager to protect the safety of the equipment.

[0068] Further, the control assembly 15 further comprises a smoke sensor 1512 for measuring the smoke inside the cabinet 2, and the smoke sensor 1512 is electrically connected to the microprocessor 152. When the live components in the cabinet 2 overheat due to short circuit or overcurrent, smoke may be generated. The smoke sensor 1512 can timely sense the smoke inside the cabinet 2 and send a signal to the microprocessor 152, so that the microprocessor 152 can timely send a prompt information to the manager or take necessary actions to protect the safety of the equipment.

[0069] Embodiment three

[0070] As shown in Figure 5 , the third embodiment of the present application provides an intelligent high-voltage switch cabinet control method for controlling the above-mentioned intelligent high-voltage switch cabinet. The control method comprises the following steps:

[0071] S1: receiving an action instruction;

[0072] S2: performing a safety state check, if the safety state does not satisfy the execution action condition, sending a safety state prompt information, and terminating the execution of the action;

[0073] S3: executing the action instruction, and starting timing;

[0074] S4: when the timing reaches a first time threshold, judging whether the first moving contact 12 reaches the open gate position or the closed gate position;

[0075] S5: according to the output result of step S4, if the first moving contact 12 has reached the open gate position or the closed gate position, sending an action completion prompt information, if the first moving contact 12 has not reached the open gate position or the closed gate position, the standby driving mechanism 14 acts to drive the first moving contact 12 away from or re-touch the first stationary contact 13, and sends a fault prompt information.

[0076] Since the first moving contact 12 needs a certain time to move to the closed gate position or the open gate position from the start of the execution of the action, in step S3, the timing is started when the execution of the action instruction is started, and when the timing reaches the first time threshold, whether the first moving contact 12 moves to the position is judged. The first time threshold is the time required for the first moving contact 12 to move to the open gate position or the closed gate position, which is obtained by experiments on multiple high-voltage circuit breakers 1 of the same type. This first threshold can also use the maximum value of multiple experimental data, or other characteristic values of statistical data. This content is not protected by the present application, and will not be described here.

[0077] In step S5, if the first moving contact 12 does not reach the open gate position or the closed gate position, different actions of the driving mechanism can be controlled according to the actual structure of the high-voltage circuit breaker 1 to ensure the safe operation of the high-voltage circuit breaker 1.

[0078] In the third embodiment of the present application, the safety state check is divided into closed gate safety check and open gate safety check.

[0079] When receiving the closed gate action instruction, first, the closed gate safety state check is performed, including the following steps:

[0080] S211: judging whether the ground knife 4 is in the open position;

[0081] S212: judging whether the pressure value of the arc extinguishing chamber 11 satisfies the execution action requirement;

[0082] S213: judging whether the handcart 3 reaches the working position;

[0083] S214: judging whether the energy storage device completes the energy storage;

[0084] S215: judging whether the closing instruction is misoperation;

[0085] When receiving the opening action instruction, first, the opening safety state check is performed, including the following steps:

[0086] S221: judging whether the pressure value of the arc extinguishing chamber 11 meets the execution action requirement;

[0087] S222: judging whether the opening instruction is misoperation.

[0088] In step S211, the judgment mode of the position of the ground blade 4 is different according to the type of the position sensor used. If a limit switch is used, when the ground blade 4 is in the on position, the ground blade 4 actuates the limit switch, and the limit switch sends a switch signal to the microprocessor 152, and the microprocessor 152 judges that the ground blade 4 has been turned on. When the ground blade 4 is turned off, the limit switch is turned off synchronously, and the microprocessor 152 judges that the ground blade 4 has been turned off. If an optical sensor is used, a reflective plate can be fixed on the second moving contact 41 of the ground blade 4. When the ground blade 4 is in the on state, the laser emitted by the optical sensor is reflected on the reflective plate, and the optical sensor receives the reflected laser, thereby determining that the ground blade 4 is in the on state.

[0089] In step S212, the pressure of the arc extinguishing chamber 11 is determined in different ways according to different specific types. For example, when a vacuum arc extinguishing chamber 11 is used, the vacuum degree of the arc extinguishing chamber 11 is detected by a negative pressure sensor 156. When the vacuum degree of the arc extinguishing chamber 11 does not meet the safety requirement, the opening or closing action is not performed. If the SF6 (sulfur hexafluoride) arc extinguishing chamber 11 is used in the high-voltage circuit breaker 1, the pressure value of the SF6 gas in the arc extinguishing chamber 11 can be judged by a special pressure sensor 156 or a pressure switch. If the pressure value does not meet the safety requirement, the opening or closing action is not performed.

[0090] In step S213, the judgment mode of the position of the handcart 3 is the same as that of the ground blade 4.

[0091] In step S214, the state judgment of the energy storage device is determined according to the specific composition of the energy storage device. If the energy storage device uses spring energy storage, the completion of energy storage can be judged by judging the position of the spring. If capacitor energy storage is used, the completion of energy storage needs to be judged according to the voltage of the capacitor.

[0092] The judgment mode of misoperation is also various. Image recognition can be performed when the management personnel input the action instruction, for example, judging whether the eyes of the management personnel are staring at the operation panel. Identification can also be performed by verifying the specific code sent synchronously with the action instruction.

[0093] For some high-voltage switch cabinets with simple structure, some contents of the safety state inspection can be omitted.

[0094] Finally: the above only for the preferred embodiments of the present application, and not for limiting the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included in the scope of protection of the present application.

Claims

1. An intelligent high-voltage switchgear, characterized in that, Including high-voltage circuit breakers; The high-voltage circuit breaker includes: an arc-extinguishing chamber, a first moving contact, a first stationary contact, a backup drive mechanism, and a control component; The first stationary contact is fixed in the arc-extinguishing chamber, the first moving contact is housed in the arc-extinguishing chamber, the first moving contact can move closer to or away from the first stationary contact, and the backup driving mechanism is used to drive the first moving contact to contact or move away from the first stationary contact. The control component includes a first position sensor and a microprocessor. The first position sensor is used to measure the distance between the first moving contact and the first stationary contact. The first position sensor is electrically connected to the microprocessor, and the microprocessor is electrically connected to the drive mechanism. The high-voltage circuit breaker also includes a moving contact connecting shaft, one end of the first moving contact extends out of the arc-extinguishing chamber and is connected to the moving contact connecting shaft; The backup drive mechanism includes: a moving contact lever, a cylinder, and a control circuit; The movable contact lever has a limiting groove along its length, the movable contact connecting shaft passes through the limiting groove and can slide along the limiting groove, and one end of the movable contact lever is fixedly connected to the piston of the cylinder. The cylinder has a first chamber and a second chamber on both sides of the piston. The control circuit includes a gas source and a reversing valve, and the reversing valve is electrically connected to the microprocessor. When the gate is opened, if the first moving contact does not move to the opening position, the reversing valve switches to the working position, so that the air source supplies air to the second chamber, and the piston drives the first moving contact to contact the first stationary contact through the moving contact lever and the moving contact connecting shaft. When closing the circuit, if the first moving contact does not move to the closing position, the reversing valve switches its working position, causing the air source to supply air to the first chamber. The piston drives the first moving contact away from the first stationary contact through the moving contact lever and the moving contact connecting shaft.

2. The intelligent high-voltage switchgear according to claim 1, characterized in that, The first position sensor is a photoelectric sensor; The first position sensor is fixedly connected to the first moving contact, and the first position sensor is perpendicular to the outer wall of the arc-extinguishing chamber so that the first position sensor can receive the laser signal reflected back from the outer wall of the arc-extinguishing chamber.

3. The intelligent high-voltage switchgear according to any one of claims 1-2, characterized in that, The intelligent high-voltage switchgear also includes a cabinet, a handcart, and a grounding switch; The cabinet is used to house the high-voltage circuit breaker, the handcart, and the grounding switch. The handcart is used to move the high-voltage circuit breaker; The grounding switch includes a second moving contact and a second stationary contact that can move closer to or further away from each other. The second moving contact is connected to the high-voltage circuit breaker, the cabinet, and the ground wire, and the second stationary contact is connected to the main line. The control component also includes a second position sensor, a third position sensor, a fourth position sensor, and a pressure sensor; The second position sensor is used to transmit the position information of the second moving contact to the microprocessor, the third position sensor is used to transmit the position information of the handcart to the microprocessor, the fourth position sensor is used to transmit the position information of the energy storage spring to the microprocessor, and the pressure sensor is used to transmit the air pressure information in the arc-extinguishing chamber to the microprocessor. The second position sensor, the third position sensor, the fourth position sensor, and the pressure sensor are all electrically connected to the microprocessor.

4. The intelligent high-voltage switchgear according to claim 3, characterized in that, The control component further includes a first temperature sensor for measuring the temperature of the first moving contact, and the first temperature sensor is electrically connected to the microprocessor.

5. The intelligent high-voltage switchgear according to claim 4, characterized in that, The control components also include a second temperature sensor, a humidity sensor, and a heating device; The second temperature sensor is used to measure the temperature inside the cabinet; The humidity sensor is used to measure the humidity inside the cabinet. The heating device is used to raise the temperature inside the cabinet. The second temperature sensor, the humidity sensor, and the heating device are all electrically connected to the microprocessor.

6. The intelligent high-voltage switchgear according to claim 5, characterized in that, The control component also includes an arc sensor for detecting electric arcs inside the cabinet, and the arc sensor is electrically connected to the microprocessor.

7. The intelligent high-voltage switchgear according to claim 6, characterized in that, The control component also includes a smoke sensor for detecting smoke inside the cabinet, and the smoke sensor is electrically connected to the microprocessor.

8. A control method for an intelligent high-voltage switchgear, characterized in that, The control method for controlling the intelligent high-voltage switchgear according to claim 4 includes the following steps: S1: Receive action instructions; S2: Perform a safety status check. If the safety status does not meet the conditions for executing the action, send a safety status prompt message and terminate the execution of the action. S3: Execute the action command and start timing; S4: When the timer reaches the first time threshold, determine whether the first moving contact has reached the opening or closing position; S5: Based on the output of step S4, if the first moving contact has reached the opening position or the closing position, an action completion prompt message is sent. If the first moving contact has not reached the opening position or the closing position, the microprocessor controls the backup drive mechanism to move the first moving contact away from or back to the first stationary contact, and a fault prompt message is sent.

9. The intelligent high-voltage switchgear control method according to claim 8, characterized in that, In step S2, the safety status check is divided into a closing safety check and an opening safety check; The closing safety check includes the following steps: S211: Determine whether the grounding knife is in the disconnected position; S212: Determine whether the pressure value of the arc-extinguishing chamber meets the requirements for performing the action; S213: Determine whether the handcart has reached the working position; S214: Determine whether the energy storage device has completed energy storage; S215: Determine if the closing command was misoperated; The gate opening safety inspection includes the following steps: S221: Determine whether the pressure value of the arc-extinguishing chamber meets the requirements for performing the action; S222: Determine if the gate opening command was misoperated.

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