Intelligent high-voltage switch cabinet and control method thereof

Abstract

The invention 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 provided by the invention is provided with a standby driving mechanism and a control assembly. The standby driving mechanism is used for driving the first movable contact to be close to or away from the first static contact when the energy storage device or the switching-off spring fails. The control assembly comprises a first position sensor and a microprocessor, in the opening or closing process, the first position sensor sends the position of the first movable contact to the microprocessor, and the microprocessor judges whether opening or closing is completed or not according to the position of the first movable contact. When the first movable contact cannot be normally closed due to the fact that the energy storage device or the connecting rod mechanism breaks down, the microprocessor controls the standby driving mechanism to act, the first movable contact is driven to be away from or close to the first static contact, the closing or opening action is completed, long-time electric arc pulling between the two contacts is avoided, and therefore the contacts and the high-voltage circuit breaker are protected.

Description

Technical Field

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

[0002] High-voltage switchgear is a device used to control the on and off of high-voltage AC circuits, and the most critical component is the high-voltage circuit breaker. High-voltage circuit breakers refer to circuit breakers with a voltage level exceeding 3kV in the power system. They are widely used in various links of power generation, transmission and transformation and play a vital role. High-voltage circuit breakers can connect and disconnect circuits according to the operating mode under normal circumstances. They can also quickly cut off the faulty equipment according to the secondary protection signal when a fault occurs, or connect the circuit to restore power after the instantaneous fault is eliminated. They have the dual functions of control and protection. The moving contacts of high-voltage circuit breakers are usually controlled by a connecting rod mechanism. When closing the circuit, the energy storage device drives the connecting rod mechanism to drive the moving contact to contact the static contact. When opening the circuit, the opening spring drives the connecting rod mechanism to drive the moving contact to separate from the static contact. Since the connecting rod mechanism is a complex mechanical linkage structure, the coordination relationship is complex and prone to failure. In addition, commonly used high-voltage switchgear uses mechanical buttons to control the movement of energy storage devices. In actual operation, any abnormality in the high-voltage circuit breaker body, operating mechanism, transmission mechanism, etc. will make the circuit breaker unable to open and close normally, and may even cause serious consequences such as the expansion of the fault range, threatening the safety and stability of the power system.

[0003] Most of the high-voltage circuit breakers currently in use are operated manually on-site, and personal injury may occur if a circuit breaker failure occurs. Although there are related technologies for automatic high-voltage switchgear, they all use open-loop control, and the contacts of the circuit breaker are usually enclosed in a sealed tank. The staff cannot intuitively judge the actual position of the contacts. For high-voltage AC circuits, it takes a certain amount of reaction time to see the result of line disconnection. The staff cannot take emergency measures based on the actual opening and closing of the high-voltage circuit breaker contacts. During the process of opening or closing the circuit breaker, if the contacts do not move into place, such as full contact or full disengagement, an arc will be generated between the two contacts. If necessary measures are not taken in time, the contacts will burn out, which may cause safety accidents in serious cases. Summary of the invention

[0004] In order to solve the technical problem in the prior art that closed-loop control cannot be performed 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 includes a high-voltage circuit breaker, and the high-voltage circuit breaker includes: an arc extinguishing chamber, a first moving contact, a first static contact, a backup drive mechanism, and a control component. The first static contact is fixed in the arc extinguishing chamber, the first moving contact is accommodated in the arc extinguishing chamber, the first moving contact can be close to or away from the first static contact, and the backup drive mechanism is used to drive the first moving contact to contact or away from the second static 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 contact and the first static contact, the first position sensor is electrically connected to the microprocessor, and the microprocessor is electrically connected to the drive mechanism.

[0006] During the process of opening or closing the gate, the first position sensor sends the position information of the first moving contact to the microprocessor, and the microprocessor determines whether the opening or closing action is completed according to the position of the first moving contact. When the energy storage device or the connecting rod mechanism fails and the first moving contact cannot be closed normally, the microprocessor controls the backup drive mechanism to drive the first moving contact away from or close to the first static contact to complete the closing or opening action, avoiding long-term arcing between the two contacts, thereby protecting the contacts and the high-voltage circuit breaker.

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

[0008] The backup drive mechanism includes: a moving contact lever, a cylinder and a control circuit. The moving contact lever is provided with a limit slide groove along the length direction, the moving contact connecting shaft is passed through the limit slide groove and can slide along the limit slide groove, and one end of the moving contact lever is fixedly connected to the piston of the cylinder. The interior of the cylinder has a first chamber and a second chamber on both sides of the piston respectively; the control circuit includes an air source and a reversing valve, the reversing valve is electrically connected to the microprocessor, and the reversing valve is used to make the air source supply air to the first chamber or the second chamber to make the piston move in different directions, thereby driving the moving contact lever to move, so as to drive the first moving contact to approach or move away from the first static contact. The cylinder serves as the power source of the backup drive mechanism, and the cylinder has a large output thrust, a simple structure and high reliability.

[0009] Specifically, the first position sensor is a photoelectric sensor, which is fixedly connected to the first moving contact, and is perpendicular to the outer wall of the arc extinguishing chamber, so that the first position sensor can receive the laser signal reflected from the outer wall of the arc extinguishing chamber, and determine the position of the first moving contact according to the reflected laser, and send the position information to the microprocessor, and judge whether the high-voltage circuit breaker is in the closed or open position according to the position information of the first position sensor.

[0010] Furthermore, the intelligent high-voltage switch cabinet further comprises a cabinet, a trolley and a grounding knife. The cabinet is used to accommodate the high-voltage circuit breaker, the trolley and the grounding knife. The trolley is used to move the high-voltage circuit breaker. The grounding knife comprises a second moving contact and a second static contact that can move closer to or farther from each other, the second moving contact is connected to the high-voltage circuit breaker, the cabinet and the ground wire, and the second static contact is connected to the main line.

[0011] 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 trolley 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. Before performing the opening or closing action, the second position sensor, the third position sensor, the fourth position sensor and the pressure sensor are used to judge the status of the ground knife, the trolley, the energy storage device and the arc extinguishing chamber respectively to judge whether the high-voltage circuit breaker can perform the opening or closing action, thereby improving automation and safety.

[0012] Furthermore, the control component further includes a first temperature sensor, which is used to measure the temperature of the first moving contact, and the first temperature sensor is electrically connected to the microprocessor. The first temperature sensor can measure the temperature of the first moving contact during daily use, so as to analyze the resistance change of the first moving contact, and then determine the wear of the first moving contact after long-term use. The temperature of the first moving contact can also be measured during the process of opening or closing the switch to determine whether the first moving contact is burned out.

[0013] Furthermore, the control component also includes 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 increase the temperature inside the cabinet, and the second temperature sensor, the humidity sensor and the heating device are all electrically connected to 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, it is necessary to set a temperature sensor, a humidity sensor and a heating device in the high-voltage switch cabinet to timely control the temperature inside the high-voltage switch cabinet to prevent water droplets from appearing inside the cabinet due to low temperature and high humidity.

[0014] Furthermore, the control component also includes an arc sensor, which is used to detect the arc inside the cabinet, and the arc sensor is electrically connected to the microprocessor. When a short circuit occurs in a live component in the cabinet, a short circuit discharge phenomenon will occur in the high-voltage circuit. The arc sensor can measure the arc in the cabinet in time and send a signal to the microprocessor, so that the microprocessor can send prompt information to the management personnel in time to protect the safety of the equipment.

[0015] Furthermore, the control component also includes a smoke sensor, which is used to detect smoke inside the cabinet, and the smoke sensor is electrically connected to the microprocessor. When the live components in the cabinet are overheated due to short circuit or overcurrent, smoke may be generated. The smoke sensor can sense the smoke in the cabinet in time and send a signal to the microprocessor, and the microprocessor can send prompt information to the management personnel in time, or take necessary actions to protect the safety of the equipment.

[0016] The present application also provides a smart high-voltage switch cabinet control method for controlling the smart high-voltage switch cabinet according to claim 8, the control method comprising the following steps: S1: Receive action instructions; S2: Check the security status. If the security status does not meet the conditions for executing the action, send a security status prompt message and terminate the action. S3: execute action instructions and start timing; S4: When the timing reaches the first time threshold, determining whether the first moving contact has reached the opening position or the closing position; S5: According to the output result 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 action of the backup drive mechanism to drive the first moving contact away from or re-contact the first static contact, and sends a fault prompt message.

[0017] This control method can realize closed-loop control of the opening or closing action of the high-voltage circuit breaker, and improve the automation level of the high-voltage switchgear. At the same time, a safety check before opening or closing the switch can effectively avoid the occurrence of safety accidents and improve the safety of the intelligent high-voltage switchgear.

[0018] Furthermore, in step S2 of the control method, 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 ground knife is in a disconnected position; S212: Determine whether the pressure value of the arc extinguishing chamber meets the execution action requirement; S213: Determine whether the trolley has reached the working position; S214: Determine whether the energy storage device has completed energy storage; S215: Determine whether the closing command is an erroneous operation; The gate opening safety inspection comprises the following steps: S221: Determine whether the pressure value of the arc extinguishing chamber meets the execution action requirement; S222: Determine whether the gate opening instruction is an erroneous operation.

[0019] Through the above safety inspection steps, the "five-prevention" inspection can be completed before opening or closing the switch, avoiding unnecessary safety accidents and improving the safety of the intelligent high-voltage switchgear.

[0020] Technical effects and advantages of the present invention: 1. By setting a first position sensor and a microprocessor, the position of the first moving contact is measured during the opening or closing process, and it is determined whether the high-voltage circuit breaker completes the closing or opening action, thereby realizing closed-loop control of the high-voltage circuit breaker; 2. By setting up a backup driving mechanism, when the energy storage device or the connecting rod mechanism fails, the first moving contact is driven to move, and the closing or opening action is completed, so as to avoid the arc between the first moving contact and the first static contact for a long time, thereby avoiding contact burnout or even more serious accidents; 3. By setting up multiple position sensors, pressure sensors and temperature sensors, a "five-prevention" check can be performed before opening or closing the switch, and the operating device of the intelligent high-voltage switchgear can be detected in real time to improve the automation and safety of the intelligent high-voltage switchgear. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional view of a high-voltage circuit breaker in a first embodiment of the present invention; Figure 2 A partial three-dimensional view of a high-voltage circuit breaker in a first embodiment of the present invention; Figure 3 It is a schematic diagram of the standby driving mechanism in the first embodiment of the present invention; Figure 4 A front view of an intelligent high-voltage switch cabinet provided by a second embodiment of the present invention; Figure 5 This is a flow chart of a control method provided by the third embodiment of the present invention.

[0022] The accompanying drawings are marked as follows: 1, high-voltage circuit breaker; 11, arc extinguishing chamber; 12, first moving contact; 13, first static contact; 14, standby drive mechanism; 141, moving contact lever; 1411, limit slide; 142, cylinder; 1421, piston; 1422, first chamber; 1423, second chamber; 143, control circuit; 1431, air source; 1432, reversing valve; 15, control assembly; 151, first position sensor; 152, microprocessor device; 153, second position sensor; 154, third position sensor; 155, fourth position sensor; 156, pressure sensor; 157, first temperature sensor; 158, second temperature sensor; 159, humidity sensor; 1510, heating device; 1511, arc sensor; 1512, smoke sensor; 16, moving contact connecting shaft; 2, cabinet; 3, trolley; 4, ground knife; 41, second moving contact; 42, second static contact. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Embodiment 1 refer to Figures 1 to 3 The first embodiment of the present invention provides an intelligent high-voltage switch cabinet, including a high-voltage circuit breaker 1. The high-voltage circuit breaker 1 includes: an arc extinguishing chamber 11, a first moving contact 12, a first static contact 13, a backup drive mechanism 14 and a control component 15. The first static 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 static contact 13, and the backup drive mechanism 14 is used to drive the first moving contact 12 to contact or move away from the second static contact 42. The control component 15 includes 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 static contact 13. The first position sensor 151 is electrically connected to the microprocessor 152, and the microprocessor 152 is electrically connected to the drive mechanism.

[0025] During the process of opening or closing the switch, the first position sensor 151 sends the position information of the first moving contact 12 to the microprocessor 152, and the microprocessor 152 determines 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 and causes the first moving contact 12 and the first static contact 13 to fail to contact each other normally, the microprocessor 152 controls the standby drive mechanism 14 to operate, driving the first moving contact 12 away from or close to the first static contact 13, completing the closing or opening action, avoiding long-term arcing between the two contacts, thereby protecting the contacts and the high-voltage circuit breaker 1.

[0026] The connecting rod mechanism, energy storage mechanism and other components in the high-voltage circuit breaker 1 are not shown in the drawings of this application due to space limitations, because the specific structures and design details adopted by high-voltage switch cabinets of different manufacturers or models are different, but the basic principles are the same. They are not improvements made by this application, and at the same time, they are avoided to avoid unnecessary restrictions on this application.

[0027] The backup drive mechanism 14 can adopt a variety of driving modes, for example, a gear rack can be set at the end of the first moving contact 12 extending from the arc extinguishing chamber 11 for driving, 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 static contact 13 by changing the direction of the current in the electromagnet. The present application adopts a cylinder 142 as the power source of the backup drive mechanism 14, and the cylinder 142 has a large output thrust, a simple structure, and high reliability.

[0028] In the first embodiment of the present application, Figure 2 and Figure 3 As shown, the high-voltage circuit breaker 1 also includes a moving contact connecting shaft 16, and one end of the first moving contact 12 extends from the arc extinguishing chamber 11 and is connected to the moving contact connecting shaft 16. The standby driving mechanism 14 includes a moving contact lever 141, a cylinder 142 and a control circuit 143. The moving contact lever 141 is provided with a limited sliding groove 1411 along the length direction, and the moving contact connecting shaft 16 is inserted into the limited sliding groove 1411 and can slide along the limited sliding groove 1411. One end of the moving contact lever 141 is fixedly connected to the piston 1421 of the cylinder 142. The interior of the cylinder 142 is divided into a first chamber 1422 and a second chamber 1423 by the piston 1421. The control circuit 143 includes an air source 1431 and a reversing valve 1432. The reversing valve 1432 is electrically connected to the microprocessor 152. The reversing valve 1432 is used to enable the air source 1431 to supply air to the first chamber 1422 or the second chamber 1423 so that the piston 1421 moves in different directions, thereby driving the moving contact lever 141 to move, so as to drive the first moving contact 12 to approach or move away from the first static contact 13.

[0029] In a normal state, the position of the moving contact lever 141 is fixed, and the moving contact connecting shaft 16 can slide freely along the limiting slide groove 1411. When the first moving contact 12 is in the closing position, the moving contact connecting shaft 16 is at the uppermost end of the limiting slide groove 1411. When the first moving contact 12 is in the opening position, the moving contact connecting shaft 16 is at the lowermost end of the limiting slide groove 1411.

[0030] During the process of opening the gate, if the first moving contact 12 does not move to the opening position, that is, the opening spring or the connecting rod mechanism fails, it means that the first moving contact 12 cannot continue to move to the opening position. If the backup drive mechanism 14 is forced to drive the first moving contact 12 to continue the opening action, it is possible to cause secondary damage to the opening spring or the connecting rod mechanism. Therefore, at this time, the control component 15 controls the reversing valve 1432 to switch the working position, so that the air source 1431 supplies air to the second chamber 1423, and the piston 1421 drives the moving contact lever 141 to move upward, so that the lower end of the limiting slide groove 1411 drives the moving contact connecting shaft 16 to move to the closing position, so that the first moving contact 12 contacts with the first static contact 13 again, avoiding long-term arcing between the two contacts, thereby realizing the protection of the contacts and the circuit breaker. When the management personnel perform maintenance, they can cut off the power supply by operating other circuit breakers in the circuit, and then perform maintenance on this circuit breaker.

[0031] The closing process is the same as the opening process. If the first moving contact 12 does not move to the closing position, that is, the energy storage mechanism or the connecting rod mechanism fails, it means that the first moving contact 12 cannot continue to move to the closing position. The control component 15 controls the reversing valve 1432 to switch the working position, so that the gas source 1431 supplies gas to the first chamber 1422, and the piston 1421 drives the moving contact lever 141 to move downward, so that the upper end of the limiting slide groove 1411 drives the moving contact connecting shaft 16 to move to the opening position, so that the first moving contact 12 is away from the first static contact 13, avoiding long-term arcing between the two contacts, thereby realizing the protection of the contacts and the circuit breaker.

[0032] Of course, for some simple or automated high-voltage circuit breakers 1, a connecting rod 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 move to the right position, the cylinder 142 can drive the moving contact lever 141 to continue to perform the opening or closing action. The corresponding reversing valve 1432 and the air supply circuit wiring method also need to be adjusted according to the specific situation.

[0033] The gas source 1431 can be an air compressor or a gas tank.

[0034] The reversing valve 1432 can be of various types. In the first embodiment of the present application, a three-position four-way electromagnetic reversing valve 1432 is used, which is a reversing valve 1432 commonly used in pneumatic control systems. It has four switching ports and three working positions, and can connect different pneumatic components. The electromagnet of the reversing valve 1432 can be remotely controlled by the control component 15, which is convenient for automatic control. In actual use, other reversing valves 1432, such as manual reversing valves 1432, or reversing valves 1432 with more switching ports or working positions can also be used to achieve more functions.

[0035] The first position sensor 151 can be a variety of types of sensors, such as a gear rack plus an absolute encoder, which can measure the position of the first moving contact 12. Alternatively, two micro switches are used, the first micro switch is used to send a signal to the microprocessor 152 when the first moving contact 12 reaches the closing position, and the second micro switch is used to send a signal to the microprocessor 152 when the first moving contact 12 reaches the opening position.

[0036] In the first embodiment of the present application, Figure 1 As shown, the first position sensor 151 adopts a photoelectric sensor, and the first position sensor 151 is fixedly connected to the first moving contact 12. 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 laser signal reflected 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 judge whether the high-voltage circuit breaker 1 is in the closed or open position according to the position information of the first position sensor 151.

[0037] In order to improve the measurement accuracy of the first position sensor 151 , a reflective plate may be provided 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 .

[0038] In the first embodiment of the present application, the microprocessor 152 may adopt a DSP+ARM dual processor architecture, which can realize the analysis and processing of various signals and run relatively complex control logic, making the control of the high-voltage circuit breaker 1 intelligent.

[0039] Embodiment 2 like Figure 4As shown, the second embodiment of the present application is a further improvement of the first embodiment. On the basis of the first embodiment, the intelligent high-voltage switch cabinet further includes a cabinet 2, a trolley 3 and a grounding knife 4. The cabinet 2 is used to accommodate the high-voltage circuit breaker 1, the trolley 3 and the grounding knife 4. The trolley 3 is used to move the high-voltage circuit breaker 1. The grounding knife 4 includes a second moving contact 41 and a second static contact 42 that can be close to or away from each other, the second moving contact 41 is connected to the high-voltage circuit breaker 1, the cabinet 2 and the ground wire, and the second static contact 42 is connected to the main line.

[0040] The control assembly 15 also includes 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 to transmit the position information of the second moving contact 41 to the microprocessor 152, the third position sensor 154 is used to transmit the position information of the trolley 3 to the microprocessor 152, the fourth position sensor 155 is used to transmit the position information of the energy storage spring to the microprocessor 152, and the pressure sensor 156 is used to transmit the 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 to the microprocessor 152. Before performing the opening or closing action, the second position sensor 153, the third position sensor 154, the fourth position sensor 155 and the pressure sensor 156 are used to judge the status of the ground knife 4, the trolley 3, the energy storage device and the arc extinguishing chamber 11 respectively, so as to judge whether the high-voltage circuit breaker 1 can perform the opening or closing action, thereby improving automation and safety.

[0041] The second position sensor 153, the third position sensor 154, and the fourth position sensor 155 can adopt either a travel limit switch or a photoelectric sensor. The travel limit switch reflects whether the equipment has moved to the specified position by outputting a switch value. It has a simple structure, low cost, and high reliability, but cannot accurately reflect the specific position of the object being measured. The photoelectric sensor can measure the specific position of the object being measured in real time, has high sensitivity, and a 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 photoelectric sensors, which can accurately measure the positions of the ground knife 4 and the trolley 3.

[0042] The pressure sensor 156 needs to use different sensors depending on the type of the arc extinguishing chamber 11. If it is a vacuum arc extinguishing chamber 11, a negative pressure sensor 156 is needed. If it is an SF6 (sulfur hexafluoride) arc extinguishing chamber 11, a dedicated positive pressure sensor 156 is needed.

[0043] Furthermore, the control assembly 15 further includes a first temperature sensor 157, which is used to measure the temperature of the first moving 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 moving contact 12 during daily use, so as to analyze the resistance change of the first moving contact 12, and then determine the wear of the first moving contact 12 after long-term use. The temperature of the first moving contact 12 can also be measured during the process of opening or closing the switch, so as to determine whether the first moving contact 12 is burned out.

[0044] Furthermore, the control component 15 also includes a second temperature sensor 158, a humidity sensor 159 and a heating device 1510. The second temperature sensor 158 is used to measure the temperature inside the cabinet 2, the humidity sensor 159 is used to measure the humidity inside the cabinet 2, and the heating device 1510 is used to increase 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 on the temperature and humidity of the use environment. When the use environment is low temperature and humid, it is necessary to set a temperature sensor, a humidity sensor 159 and a heating device 1510 in the high-voltage switch cabinet to timely control the temperature inside the high-voltage switch cabinet to prevent water droplets from appearing inside the cabinet 2 due to low temperature and high humidity.

[0045] Furthermore, the control assembly 15 also includes an arc sensor 1511, which is used to measure the arc in the cabinet 2, and the arc sensor 1511 is electrically connected to the microprocessor 152. When a short circuit occurs in a live component in the cabinet 2, a short circuit discharge phenomenon occurs in the high-voltage circuit. 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 send prompt information to the management personnel in time to protect the safety of the equipment.

[0046] Furthermore, the control component 15 also includes a smoke sensor 1512, which is used to measure the smoke in the cabinet 2, and the smoke sensor 1512 is electrically connected to the microprocessor 152. When the live components in the cabinet 2 are overheated due to short circuit or overcurrent, smoke may be generated. The smoke sensor 1512 can sense the smoke in the cabinet 2 in time and send a signal to the microprocessor 152. The microprocessor 152 can send prompt information to the management personnel in time, or take necessary actions to protect the safety of the equipment.

[0047] Embodiment 3 like Figure 5 As shown, the third embodiment of the present application provides a method for controlling an intelligent high-voltage switch cabinet, which is used to control the above-mentioned intelligent high-voltage switch cabinet. The control method includes the following steps: S1: Receive action instructions; S2: Check the security status. If the security status does not meet the conditions for executing the action, send a security status prompt message and terminate the action. S3: execute action instructions and start timing; S4: When the timing reaches the first time threshold, determine whether the first moving contact 12 reaches the open position or the closed position; S5: According to the output result of step S4, if the first moving contact 12 has reached the open position or the closed position, an action completion prompt message is sent; if the first moving contact 12 has not reached the open position or the closed position, the standby drive mechanism 14 is actuated to drive the first moving contact 12 away from or re-contact the first static contact 13, and a fault prompt message is sent.

[0048] Since it takes a certain amount of time for the first moving contact 12 to move to the closing position or the opening position from the start of the action, in step S3, the timing starts when the action instruction is executed, and when the timing reaches the first time threshold, it is judged whether the first moving contact 12 has moved to the position. The first time threshold is the time required for the first moving contact 12 to move to the opening or closing position obtained by experimenting with multiple high-voltage circuit breakers 1 of the same model. This first threshold can be the maximum value of multiple experimentally measured data, or the characteristic value of other statistical data. This content is not the content to be protected by this application and will not be repeated here.

[0049] In step S5 , if the first moving contact 12 does not reach the open position or the closed position, the drive mechanism can be controlled to perform different actions according to the actual structure of the high-voltage circuit breaker 1 to ensure the safe operation of the high-voltage circuit breaker 1 .

[0050] In the third embodiment of the present application, the safety status check is divided into a closing safety check and an opening safety check.

[0051] When a closing action command is received, the closing safety status check is first performed, including the following steps: S211: Determine whether the ground knife 4 is in the disconnected position; S212: Determine whether the pressure value of the arc extinguishing chamber 11 meets the execution action requirement; S213: Determine whether the trolley 3 has reached the working position; S214: Determine whether the energy storage device has completed energy storage; S215: Determine whether the closing command is an erroneous operation; When receiving the gate opening action command, the gate opening safety status check is first performed, including the following steps: S221: Determine whether the pressure value of the arc extinguishing chamber 11 meets the execution action requirement; S222: Determine whether the gate opening instruction is an erroneous operation.

[0052] In step S211, the position of the ground knife 4 is determined in different ways according to the type of position sensor used. If a limit switch is used, when the ground knife 4 is in the on position, the ground knife 4 turns on the limit switch, and the limit switch sends a switch signal to the microprocessor 152, and the microprocessor 152 determines that the ground knife 4 is on. When the ground knife 4 is disconnected, the limit switch is disconnected synchronously, and the microprocessor 152 determines that the ground knife 4 is disconnected. If a photoelectric sensor is used, a reflector can be fixed on the second moving contact 41 of the ground knife 4. When the ground knife 4 is in the on state, the laser emitted by the photoelectric sensor is irradiated on the reflector, and the photoelectric sensor receives the reflected laser, thereby determining that the ground knife 4 is in the on state.

[0053] In step S212, the pressure of the arc extinguishing chamber 11 is measured in different ways according to the specific type. For example, when a vacuum arc extinguishing chamber 11 is used, the vacuum degree of the arc extinguishing chamber 11 is detected by the negative pressure sensor 156. When the vacuum degree of the arc extinguishing chamber 11 does not meet the safety requirements, the opening or closing action is not performed. If the high-voltage circuit breaker 1 uses an SF6 (sulfur hexafluoride) arc extinguishing chamber 11, the SF6 gas pressure value in the arc extinguishing chamber 11 can be determined by a dedicated pressure sensor 156 or a pressure switch. If the pressure value does not meet the safety requirements, the opening or closing action is not performed.

[0054] In step S213 , the position of the trolley 3 is determined in the same manner as that of the ground cutter 4 .

[0055] In step S214, the state 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 position of the spring can be used to determine whether energy storage is completed. If capacitor energy storage is used, the voltage of the capacitor is used to determine whether energy storage is completed.

[0056] There are also many ways to judge wrong operation. When the manager inputs the action command, image recognition can be performed, for example, to determine whether the manager's eyes are looking at the operation panel. It can also be identified by verifying the specific code sent synchronously with the action command.

[0057] For some high-voltage switchgear with simpler structures, some contents of the safety status inspection can be omitted.

[0058] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An intelligent high-voltage switch cabinet, characterized in that: Includes high voltage circuit breakers; The high-voltage circuit breaker comprises: an arc extinguishing chamber, a first moving contact, a first static contact, a backup driving mechanism and a control component; The first static 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 static contact, and the standby driving mechanism is used to drive the first movable contact to contact or away from the first static 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 static contact. The first position sensor is electrically connected to the microprocessor, and the microprocessor is electrically connected to the driving mechanism.

2. The intelligent high-voltage switch cabinet according to claim 1, characterized in that: The high-voltage circuit breaker further comprises a moving contact connecting shaft, one end of the first moving contact protrudes from the arc extinguishing chamber and is connected to the moving contact connecting shaft; The backup driving mechanism comprises: a moving contact lever, a cylinder and a control circuit; The movable contact lever is provided with a limited sliding groove along the length direction, the movable contact connecting shaft is passed through the limited sliding groove and can slide along the limited sliding groove, and one end of the movable contact lever is fixedly connected to the piston of the cylinder; The interior of the cylinder has a first chamber and a second chamber on both sides of the piston respectively; The control circuit includes an air source and a reversing valve, wherein the reversing valve is electrically connected to the microprocessor, and the reversing valve is used to allow the air source to supply air to the first chamber or the second chamber so that the piston moves in different directions, thereby driving the moving contact lever to move, so as to drive the first moving contact to approach or move away from the first static contact.

3. The intelligent high-voltage switch cabinet 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 from the outer wall of the arc extinguishing chamber.

4. The intelligent high-voltage switch cabinet according to any one of claims 1 to 3, characterized in that: The intelligent high-voltage switch cabinet also includes a cabinet body, a trolley and a ground switch; The cabinet is used to accommodate the high-voltage circuit breaker, the trolley and the grounding knife; The trolley is used to move the high-voltage circuit breaker; The ground switch comprises a second moving contact and a second static contact which can be close to or 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 static contact is connected to the main line; The control assembly further 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 trolley 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.

5. The intelligent high-voltage switch cabinet according to claim 4, characterized in that: The control component also includes a first temperature sensor, which is used to measure the temperature of the first moving contact, and the first temperature sensor is electrically connected to the microprocessor.

6. The intelligent high-voltage switch cabinet according to claim 5, characterized in that: The control assembly also includes 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 increase the temperature inside the cabinet; The second temperature sensor, the humidity sensor and the heating device are all electrically connected to the microprocessor.

7. The intelligent high-voltage switch cabinet according to claim 6, characterized in that: The control component further comprises an arc sensor, which is used to detect an arc inside the cabinet, and the arc sensor is electrically connected to the microprocessor.

8. The intelligent high-voltage switch cabinet according to claim 7, characterized in that: The control component further comprises a smoke sensor, which is used to detect smoke inside the cabinet and is electrically connected to the microprocessor.

9. An intelligent high-voltage switch cabinet control method, characterized in that: Used to control the intelligent high-voltage switch cabinet according to claim 4, the control method comprises the following steps: S1: Receive action instructions; S2: Check the security status. If the security status does not meet the conditions for executing the action, send a security status prompt message and terminate the action. S3: execute action instructions and start timing; S4: When the timing reaches the first time threshold, determining whether the first moving contact has reached the opening position or the closing position; S5: According to the output result 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 action of the backup drive mechanism to drive the first moving contact away from or re-contact the first static contact, and sends a fault prompt message.

10. The intelligent high-voltage switch cabinet control method according to claim 9, 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 comprises the following steps: S211: Determine whether the ground knife is in a disconnected position; S212: Determine whether the pressure value of the arc extinguishing chamber meets the execution action requirement; S213: Determine whether the trolley has reached the working position; S214: Determine whether the energy storage device has completed energy storage; S215: Determine whether the closing command is an erroneous operation; The gate opening safety inspection comprises the following steps: S221: Determine whether the pressure value of the arc extinguishing chamber meets the execution action requirement; S222: Determine whether the gate opening instruction is an erroneous operation.

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