Motor drive high-voltage switch self-checking method and motor drive high-voltage switch

Abstract

The application belongs to the field of high-voltage switch devices, and particularly relates to a motor-driven high-voltage switch self-checking method and a motor-driven high-voltage switch. The motor-driven high-voltage switch comprises a circuit breaker and a driving motor. A driving mechanism is used for driving the moving contact to perform opening and closing actions. A controller is used for controlling the action of the operating mechanism. The controller can control the execution of the self-checking method. First, a reference point is selected on the driving mechanism and / or the moving contact. Second, the motor is controlled to move slightly within the range of the closing and opening positions. Third, at least one of the displacement information, the speed information, the current information and the voltage information of the motor during the detection action is extracted as the result information, which is compared with the corresponding standard information to determine whether the motor-driven high-voltage switch has a fault that affects its normal opening and closing. Through the scheme, the motor-driven high-voltage switch can be regularly self-checked, and faults can be found in time.

Description

Technical Field

[0001] This invention belongs to the field of high-voltage switchgear, specifically relating to a self-testing method for a motor-driven high-voltage switch and a motor-driven high-voltage switch. Background Technology

[0002] The primary function of a high-voltage switch is to act as an interrupting component, controlling the opening and closing of high-voltage circuits, and is an essential part of ensuring the reliable operation of the high-voltage power grid. The interrupting function of a high-voltage switch is mainly realized through the opening and closing operation between the moving and stationary contacts.

[0003] Specifically, high-voltage switches include circuit breakers, which contain stationary and moving contacts. Correspondingly, high-voltage switches also have a drive mechanism that actuates a linkage, which in turn actuates the moving contact. Currently, the most advanced drive mechanism is the servo motor drive mechanism. For example, the Chinese utility model patent CN206259270U, ​​published on June 16, 2017, discloses an isolation circuit breaker whose operating mechanism is powered by a servo motor. In addition, a control cabinet is provided for the servo motor to control its movement. Based on the characteristics of servo motors, servo motor drive mechanisms have the advantages of high control precision and strong controllability, enabling excellent control of the moving contact's movement. Meanwhile, in order to ensure that the high-voltage switch is easy to manufacture, the design of the high-voltage switch will include a margin for the movement stroke of the moving contact, so that the closing position and the opening position are within the same range. In this way, when the high-voltage switch performs a closing action, the moving contact only needs to move to the closing position range to achieve the closing state. Similarly, when performing an opening action, the moving contact only needs to move to the opening position range to achieve the opening state.

[0004] Because high-voltage switches operate at extremely low frequency, they are prone to problems such as component aging, motion mechanism jamming, motor stalling, and other control malfunctions due to prolonged standby. If these problems are not detected and resolved in time, the high-voltage switch will not be able to perform opening and closing operations smoothly and reliably, which can easily lead to safety accidents. Summary of the Invention

[0005] The purpose of this invention is to provide a self-testing method for a motor-driven high-voltage switch, so as to solve the technical problem in the prior art that the failure of the motor-driven high-voltage switch to detect faults in advance and in a timely manner leads to the inability to perform normal opening and closing operations of the motor-driven high-voltage switch smoothly and reliably; the purpose of this invention is also to provide a motor-driven high-voltage switch that can implement the above-mentioned high-voltage switch self-testing method.

[0006] To achieve the above objectives, the technical solution of the self-testing method for motor-driven high-voltage switches provided by this invention is as follows:

[0007] A self-testing method for a motor-driven high-voltage switch includes the following steps:

[0008] The first step is to select a reference point on the drive mechanism and / or moving contact;

[0009] The second step is to control the motor's operation. If the motor drives the high-voltage switch to be in the closed state, it drives the moving contact to move within the closed position range and returns to the position before the action after the action is completed, thus completing the detection action. If the motor drives the high-voltage switch to be in the open state, it drives the moving contact to move within the open position range and returns to the position before the action after the action is completed, thus completing the detection action.

[0010] The third step involves taking at least one of the following four pieces of information extracted from the reference point during the detection process: displacement information, speed information, motor current information, and voltage information. This result information is then compared with the corresponding standard information to determine whether there is a fault affecting the normal opening and closing of the motor-driven high-voltage switch. The standard information consists of the displacement information, speed information, motor current information, and voltage information of the reference point during the detection process, assuming there is no fault in the motor-driven high-voltage switch. When performing the second step, it is first determined whether a normal opening and closing operation command has been received. If so, the normal opening and closing operation command is executed first. If not, the first to third steps described above are executed.

[0011] The beneficial effects are: during testing, the motor is controlled to operate, and the motor-driven moving contact operates within the design margin. The entire testing process will not cause the motor-driven high-voltage switch to change its opening or closing state. Uninterrupted testing of the motor-driven high-voltage switch can be performed at any time. After the moving contact's testing action is completed, the extracted result information is compared with standard information. If any of the control system, drive mechanism, or transmission structure of the motor-driven high-voltage switch is faulty, then the extracted structural information will change compared with the displacement, speed, current, and voltage information of the reference point during the testing action when the motor-driven high-voltage switch is fault-free. This indicates that the motor-driven high-voltage switch is faulty.

[0012] As a further improvement, in the third step, the displacement information of the reference point and the current information of the motor are extracted as the result information.

[0013] The beneficial effect is that by comparing displacement and current information simultaneously, the fault condition of the motor-driven high-voltage switch can be judged more comprehensively and accurately.

[0014] As a further improvement, when it is determined that there is a fault in the high-voltage switch of the motor drive that affects its normal opening and closing, the IGBT that outputs electrical energy to the motor is blocked.

[0015] The beneficial effect is that by blocking the IGBT, the motor can be prevented from burning out after a failure of the high-voltage switch driving the motor.

[0016] As a further improvement, the second step described above is not performed during the normal opening and closing time of the high-voltage switch driven by the motor.

[0017] The beneficial effects are: within the normal opening and closing time of the motor-driven high-voltage switch, the normal opening and closing action of the motor-driven high-voltage switch can realize the self-test of the motor-driven high-voltage switch. Therefore, there is no need to perform micro-motion self-test, which saves energy and improves the safety of the motor-driven high-voltage switch.

[0018] As a further improvement, the current value of the drive motor during the detection process is less than the current value of the drive motor during normal opening and closing.

[0019] The beneficial effects are: the testing process aims to detect whether the motor drives the high-voltage switch to operate normally. Setting the current value of the motor during the testing process to the current value of the motor during normal opening and closing can achieve energy saving as much as possible while realizing the test.

[0020] To solve the above-mentioned technical problems, the motor-driven high-voltage switch in this invention adopts the following technical solution:

[0021] A motor-driven high-voltage switch includes a circuit breaker with a built-in moving contact and a stationary contact. The power unit of the drive mechanism is a drive motor, and the power output terminal is connected to the moving contact of the circuit breaker via a connecting rod for driving the moving contact to perform opening and closing actions. A controller is used to control the action of the operating mechanism, and the controller can control the operating mechanism to perform the following self-testing methods:

[0022] The first step is to select a reference point on the drive mechanism and / or moving contact;

[0023] The second step is to control the motor's operation. If the motor drives the high-voltage switch to be in the closed state, it drives the moving contact to move within the closed position range and returns to the position before the action after the action is completed, thus completing the detection action. If the motor drives the high-voltage switch to be in the open state, it drives the moving contact to move within the open position range and returns to the position before the action after the action is completed, thus completing the detection action.

[0024] The third step involves taking at least one of the following four pieces of information extracted from the reference point during the detection process: displacement information, speed information, motor current information, and voltage information. This result information is then compared with the corresponding standard information to determine whether there is a fault affecting the normal opening and closing of the motor-driven high-voltage switch. The standard information consists of the displacement information, speed information, motor current information, and voltage information of the reference point during the detection process, assuming there is no fault in the motor-driven high-voltage switch. When performing the second step, it is first determined whether a normal opening and closing operation command has been received. If so, the normal opening and closing operation command is executed first. If not, the first to third steps described above are executed.

[0025] The beneficial effects are: during testing, the motor is controlled to operate, and the motor-driven moving contact operates within the design margin. The entire testing process does not cause the motor-driven high-voltage switch to change its opening or closing state. Uninterrupted testing of the motor-driven high-voltage switch can be performed at any time. After the moving contact's testing action is completed, the extracted result information is compared with standard information. If any of the control system, drive mechanism, or transmission structure of the motor-driven high-voltage switch is faulty, the extracted structural information will change compared to the displacement, speed, current, and voltage information of the reference point during the testing action when the motor-driven high-voltage switch is fault-free. This allows it to be determined that the motor-driven high-voltage switch is faulty, thus enabling the motor-driven high-voltage switch to perform self-testing during use.

[0026] As a further improvement, in the third step, the displacement information of the reference point and the current information of the motor are extracted as the result information.

[0027] The beneficial effect is that by comparing displacement and current information simultaneously, the fault condition of the motor-driven high-voltage switch can be judged more comprehensively and accurately.

[0028] As a further improvement, when it is determined that there is a fault in the high-voltage switch of the motor drive that affects its normal opening and closing, the IGBT that outputs electrical energy to the motor is blocked.

[0029] The beneficial effect is that by blocking the IGBT, the motor can be prevented from burning out after a failure of the high-voltage switch driving the motor.

[0030] As a further improvement, the second step described above is not performed during the normal opening and closing time of the high-voltage switch driven by the motor.

[0031] The beneficial effects are: within the normal opening and closing time of the motor-driven high-voltage switch, the normal opening and closing action of the motor-driven high-voltage switch can realize the self-test of the motor-driven high-voltage switch. Therefore, there is no need to perform micro-motion self-test, which saves energy and improves the safety of the motor-driven high-voltage switch.

[0032] As a further improvement, the current value of the drive motor during the detection process is less than the current value of the drive motor during normal opening and closing.

[0033] The beneficial effects are: the testing process aims to detect whether the motor drives the high-voltage switch to operate normally. Setting the current value of the motor during the testing process to the current value of the motor during normal opening and closing can achieve energy saving as much as possible while realizing the test. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of embodiment 1 of the motor-driven high-voltage switch in this invention;

[0035] Figure 2 This is a cross-sectional view of the display pole and crank arm box internal structure of Embodiment 1 of the motor-driven high-voltage switch in this invention;

[0036] Figure 3 This is a schematic diagram showing the rotation angle of the power output shaft of the drive motor when the moving contact of the motor-driven high-voltage switch in Embodiment 1 of the present invention moves by 1.5mm.

[0037] Figure 4 This is a schematic diagram of the internal structure of the crank arm box in the tripped state of Embodiment 1 of the motor-driven high-voltage switch of the present invention;

[0038] Figure 5 This is a schematic diagram of the internal structure of the pole post and crank arm box after the moving contact moves up 1.5mm during self-test in the open state of the motor-driven high-voltage switch embodiment 1 of the present invention.

[0039] Figure 6 This is a schematic diagram of the internal structure of the crank arm box in the closed state of Embodiment 1 of the motor-driven high-voltage switch of the present invention;

[0040] Figure 7 This is a schematic diagram of the internal structure of the pole post and crank arm box after the moving contact moves down 1.5mm during self-testing in the closed state of the motor-driven high-voltage switch embodiment 1 of the present invention;

[0041] Figure 8 This is a flowchart of the self-test strategy for embodiment 1 of the motor-driven high-voltage switch in this invention;

[0042] Figure 9 This refers to the standard displacement information of the reference point extracted in a self-test action for Embodiment 1 of the motor-driven high-voltage switch in this invention.

[0043] Figure 10 This refers to the standard speed information of the reference point extracted in other embodiments of the motor-driven high-voltage switch in this invention within a self-test action;

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Arc-extinguishing chamber; 2. Support column; 3. Insulating tie rod; 4. Crossbeam; 5. Bracket; 6. Crank arm box; 7. Crank arm; 8. Torsion bar; 9. Spline; 10. First pin; 11. Second pin; 12. Drive motor. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0048] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the process or method that includes said element.

[0049] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "provided with" should be interpreted broadly. For example, the object "provided with" can be a part of the main body, or it can be separately arranged from the main body and connected to the main body. This connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0051] The present invention will be further described in detail below with reference to the embodiments.

[0052] Specific embodiment 1 of the motor-driven high-voltage switch provided by the present invention: as follows Figure 1 As shown, the motor-driven high-voltage switch includes three parallel-arranged poles at the top, each pole containing an arc-extinguishing chamber 1 and a support column 2. The arc-extinguishing chamber 1 contains a circuit breaker, as well as conductive and arc-breaking components: a stationary contact and a moving contact. The support column 2 is equipped with a transmission mechanism for transmitting power from the drive mechanism to the moving contact. Specifically, an insulating pull rod 3 is provided in the support column 2, with one end of the insulating pull rod 3 connected to the moving contact and the other end connected to the drive mechanism.

[0053] The lower part of the motor-driven high-voltage switch consists of a crossbeam 4 and a bracket 5. The crossbeam 4 is a box-shaped structure fixed to the upper end of the bracket 5. The three-phase poles are fixed to the upper end of the crossbeam 4. The crossbeam 4 and the bracket 5 provide overall support for the high-voltage switch. Each phase pole has a corresponding crank arm box 6 below it, such as... Figure 2 As shown, each crank arm box 6 is equipped with a crank arm 7. A torsion bar 8 is provided between the two crank arms 7 below adjacent two phase poles. The two sections of the torsion bar of the motor-driven high-voltage switch are also connected by transmission. Splines 9 are installed at both ends of each section of the torsion bar 8 through mechanical toothed anti-rotation. The splines 9 and the crank arm 7 are connected by a first pin 10. A drive motor 12 is provided at the left end of the crossbeam 4. In this embodiment, the drive motor 12 is specifically a servo motor. In other embodiments, the drive motor can also be a stepper motor. The power output shaft of the drive motor 12 is connected by transmission to the torsion bar 8 at the left end. The other end of the crank arm 7 is connected by transmission to the insulating pull rod 3 through a second pin 11, realizing the transmission connection between the transmission mechanism and the drive mechanism. The motor-driven high-voltage switch also includes a controller (not shown in the figure) for controlling the operation of the drive motor 12.

[0054] In specific operation, under the control of the controller, the drive motor 12 drives the torsion bar 8 to rotate. The torsion bar 8 drives the moving contacts to move through the spline 9, crank arm 7, and insulating pull rod 3, thereby realizing the opening and closing of the circuit breaker. Since the motor-driven high-voltage switch is related to the safe operation of the entire high-voltage power grid, it is necessary to ensure that the control system, drive mechanism, and transmission mechanism of the motor-driven high-voltage switch are operating normally before normal opening and closing operations are performed. Therefore, if any fault occurs in the control system, drive mechanism, or transmission mechanism of the motor-driven high-voltage switch, it must be detected and eliminated in a timely manner to prevent the motor-driven high-voltage switch from failing to perform opening and closing operations when required, thus preventing accidents.

[0055] To enable timely detection of faults in the control system, drive mechanism, and transmission mechanism, the motor-driven high-voltage switch of this invention can perform daily self-checks. Specifically, through the controller's built-in control program, the controller can control the drive motor 12 to periodically repeat micro-motion actions. The following describes the self-checking method of a motor-driven high-voltage switch with a total moving contact stroke of 80±3mm as an example. Considering the total moving contact stroke of 80±3mm, it can be understood that even if the moving contact moves up and down by 1.5mm at the opening point, it will still be in the open position, as follows: Figure 3 As shown, taking the motor-driven high-voltage switch in the open state as an example, with the hinge point between the crank arm 7 and the spline 9 at the lowest point, the moving contact moves upward by 1.5mm, which requires the power output shaft of the motor 12 to rotate by 15.47° (arccos38.5 / 40 =15.47°).

[0056] In actual micro-motion self-testing, such as Figure 4 As shown, before the self-test, the motor-driven high-voltage switch is in the open state. During the self-test, the controller controls the power output shaft of the drive motor 12 to rotate forward by 15.47°. Correspondingly, as... Figure 5 As shown, the insulating rod 3 drives the moving contact to move upward a distance t, where t = 1.5 mm. Then, the controller controls the drive motor 12 to reverse, and the insulating rod 3 carries the moving contact back to the initial position before the micro-motion. Based on the design of the moving contact's movement margin in the open position, even if the moving contact moves upward by 1.5 mm, it will not cause the components in the arc-extinguishing chamber to break down. Throughout the micro-motion self-test process, the moving contact remains in the open position.

[0057] Similarly, when the motor drives the high-voltage switch to the closed position, such as Figure 6 As shown, the hinge point between the crank arm 7 and the spline 9 is at its highest position. During self-test, the controller controls the power output shaft of the drive motor 12 to reverse by 15.47°. Correspondingly, as... Figure 7As shown, the insulating rod 3 drives the moving contact to move downward a distance t, where t = 1.5 mm. Then, the controller controls the drive motor 12 to rotate forward, and the insulating rod 3 carries the moving contact back to the initial position before the micro-motion. Based on the design of the moving contact's movement margin in the closed position, even if the moving contact moves downward by 1.5 mm, it is still in the closed position.

[0058] The flowchart of the micro-motion strategy when the motor drives the high-voltage switch to perform self-test is as follows: Figure 8 As shown, during micro-motion detection, it first determines whether a normal opening and closing command for the motor-driven high-voltage circuit breaker has been received, distinguishing between normal opening and closing and micro-motion strategy actions. If a normal opening and closing command for the motor-driven high-voltage switch is received, the normal opening and closing command for the motor-driven high-voltage switch is executed first. If no normal opening and closing command for the motor-driven high-voltage switch is received, the micro-motion self-test strategy continues to be executed. Then, the actual state of the motor-driven high-voltage switch is clearly determined. If it is in the open state, the micro-motion strategy is executed to rotate the power output axis of the drive motor 12 to the closed position by a certain angle and then return to the initial position before micro-motion. If it is in the closed state, the opposite is true.

[0059] To determine whether the motor-driven high-voltage switch has a fault affecting normal opening and closing, in this embodiment, the power output shaft of the drive motor 12 is used as a reference point. The displacement data of the power output shaft of the drive motor 12 during the entire micro-motion self-test process is extracted as the result information. The result information is sent to the calculation board for comparison with the corresponding standard information, and the comparison result is uploaded. The displacement information of the power output shaft of the drive motor 12 mentioned here refers to the arc of rotation of a point on it during the micro-motion process. The standard information refers to the displacement data of the power output shaft of the drive motor 12 after completing one self-test micro-motion when the motor-driven high-voltage switch has not malfunctioned, as follows: Figure 9 As shown, if any of the control system, drive mechanism, or transmission mechanism of the motor-driven high-voltage switch malfunctions, there will be a significant discrepancy between the resulting information and the standard information. This indicates that the motor-driven high-voltage switch has a fault affecting its normal opening and closing operation. Operators can promptly troubleshoot based on the test results to ensure that the motor-driven high-voltage switch can smoothly perform opening and closing operations when necessary. Furthermore, in this embodiment, when a fault affecting the normal opening and closing operation of the motor-driven high-voltage switch is detected, the controller controls the IGBT to stop supplying current to the drive motor 12.

[0060] In addition to collecting displacement information, this embodiment also collects the current information of the drive motor 12 as the result information. The corresponding standard information is the current information during other micro-motion self-tests before this micro-motion self-test, and when the motor-driven high-voltage switch does not have a fault that affects its normal opening and closing operation. If the motor-driven high-voltage switch has a fault that affects its normal opening and closing operation during a certain micro-motion self-test, the current information collected this time will have a large fluctuation compared with the current information collected in the past.

[0061] The reason for simultaneously collecting displacement and current information is that the control method for servo motors is typically a three-closed-loop control method, as detailed below:

[0062] The innermost loop is the current loop, which operates entirely within the servo driver. It uses Hall effect sensors to detect the output current of each phase of the motor and provides negative feedback to the current setting for PID control, thereby ensuring that the output current is as close as possible to the set current. The current loop controls the motor torque, so the driver's computation is minimized and the dynamic response is fastest in torque mode.

[0063] The second loop is the speed loop, which uses the signal from the servo motor encoder for negative feedback PID control. Its PID output is directly the setting of the current loop. Therefore, speed loop control includes both speed loop and current loop. In other words, the current loop must be used in any mode. The current loop is the foundation of control. While controlling speed and position, the system is also controlling the current (torque) to achieve corresponding control of speed and position.

[0064] The outermost loop is the position loop, which is responsible for position setting and adjustment. Its PID output is directly the speed loop setting. The feedback signal can be taken from either the motor encoder or the final load, depending on the actual situation. Since the position control loop's output is the speed loop setting, the system performs calculations for all three loops in position control mode. This results in the highest computational load and the slowest dynamic response.

[0065] For motor-driven high-voltage switchgear, monitoring the current loop and position loop is paramount, followed by the speed loop. Current is fundamental to powering the motor; if an abnormality occurs, the actual current curve will deviate significantly from the preset value, potentially damaging the IGBT devices. Similarly, for high-voltage switches, the travel between the moving and stationary contacts is fixed. Whether it's a micro-motion or normal operation, exceeding the normal operating range will also damage the switchgear itself. As two crucial indicators, any abnormality in either signifies equipment malfunction and can have serious consequences. Monitoring both simultaneously, especially if both are abnormal, further confirms the occurrence of a fault.

[0066] Of course, in other embodiments, the speed information of the reference point and the voltage information of the capacitor supplying power to the drive motor 12 can also be extracted simultaneously as result information and compared with the standard information to determine whether there is a fault affecting the normal opening and closing operation of the motor-driven high-voltage switch. The standard speed information is as follows: Figure 10 As shown, speed information is transmitted to the driver via the motor encoder for data analysis and processing, and then transmitted back to the computer for observation. Capacitor voltage drop information is obtained by connecting the positive and negative terminals of the capacitor to the internal circuits of the motor driver and the high-voltage switch control cabinet, respectively. The capacitor voltage drop can be observed in real time by connecting a computer to the driver, or by observing the parameter changes on the digital voltmeter on the high-voltage switch control cabinet. Regarding the acquisition of result information, in other embodiments, any one, two, or three of the displacement information, speed information, and current and voltage information of the drive motor can be extracted as result information. Alternatively, all four types of information can be extracted simultaneously as result information.

[0067] In this embodiment, the control system executes the micro-motion self-test strategy every 30 days to achieve daily, timed self-testing of the motor-driven high-voltage switch. In other embodiments, the frequency of self-testing of the motor-driven high-voltage switch can be adaptively set according to actual needs. Of course, manual operation can also be used to initiate the micro-motion self-test as needed.

[0068] In addition, in this embodiment, the current for driving the drive motor 12 to perform micro-motion self-test is less than the current value for driving the drive motor 12 to operate when the motor drives the high-voltage switch to perform normal opening and closing operations, thereby achieving energy saving. In this embodiment, the self-test current is about 350A less than the normal current. In other embodiments, the self-test current can be set appropriately according to the actual operating conditions.

[0069] The specific embodiment 2 of the motor-driven high-voltage switch provided by this invention differs from embodiment 1 mainly in that: in embodiment 1, the power output shaft of the drive motor is selected as the reference point to obtain the displacement and velocity information of the reference point. In this embodiment, other points on the drive mechanism are selected as reference points, such as a point on the torsion bar or a point on the crank arm. The displacement and velocity information of the reference point are obtained by setting displacement and velocity sensors. Of course, the moving contact can also be selected as the reference point.

[0070] An embodiment of the self-testing method for motor-driven high-voltage switches in this invention: The self-testing strategy of the self-testing method for motor-driven high-voltage switches in this invention is the same as that in the above embodiments of motor-driven high-voltage switches, and will not be repeated here.

[0071] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-testing method for a motor-driven high-voltage switch, characterized in that, Includes the following steps: The first step is to select a reference point on the drive mechanism and / or moving contact; The second step is to control the motor's operation. If the motor drives the high-voltage switch to be in the closed state, it drives the moving contact to move within the closed position range and returns to the position before the action after the action is completed, thus completing the detection action. If the motor drives the high-voltage switch to be in the open state, it drives the moving contact to move within the open position range and returns to the position before the action after the action is completed, thus completing the detection action. The third step involves taking at least one of the following four pieces of information extracted from the reference point during the detection process: displacement information, speed information, motor current information, and voltage information. This result information is then compared with the corresponding standard information to determine whether there is a fault affecting the normal opening and closing of the motor-driven high-voltage switch. The standard information consists of the displacement information, speed information, motor current information, and voltage information of the reference point during the detection process, assuming there is no fault in the motor-driven high-voltage switch. When performing the second step, it is first determined whether a normal opening and closing operation command has been received. If so, the normal opening and closing operation command is executed first. If not, the first to third steps described above are executed. During the second step, the motor is controlled to operate during the test. The motor drives the moving contact to operate within the design margin of the high-voltage switch opening and closing. The motor does not change the opening and closing state of the high-voltage switch during the entire test process.

2. The self-testing method for a motor-driven high-voltage switch according to claim 1, characterized in that, In the third step, the displacement information of the reference point and the current information of the motor are extracted as the result information.

3. The self-testing method for a motor-driven high-voltage switch according to claim 1 or 2, characterized in that, Once it is determined that there is a fault in the high-voltage switch driving the motor that affects its normal opening and closing, the IGBT that outputs electrical energy to the motor is blocked.

4. The self-testing method for a motor-driven high-voltage switch according to claim 1 or 2, characterized in that, The second step described above is not performed within the normal opening and closing time of the high-voltage switch driven by the motor.

5. The self-testing method for a motor-driven high-voltage switch according to claim 1 or 2, characterized in that, During the test, the current value of the drive motor (12) is less than the current value of the drive motor (12) when it is normally opening and closing.

6. A motor-driven high-voltage switch, comprising a circuit breaker with built-in moving and stationary contacts and a drive mechanism for a drive motor (12), wherein the power output end of the drive mechanism is connected to the moving contact of the circuit breaker via a connecting rod for driving the moving contact to perform opening and closing actions; the motor-driven high-voltage switch further comprises a controller for controlling the action of the operating mechanism; characterized in that, The controller is capable of controlling the operating mechanism to perform the following self-test methods: The first step is to select a reference point on the drive mechanism and / or moving contact; The second step is to control the motor's operation. If the motor drives the high-voltage switch to be in the closed state, it drives the moving contact to move within the closed position range and returns to the position before the action after the action is completed, thus completing the detection action. If the motor drives the high-voltage switch to be in the open state, it drives the moving contact to move within the open position range and returns to the position before the action after the action is completed, thus completing the detection action. The third step involves taking at least one of the following four pieces of information extracted from the reference point during the detection process: displacement information, speed information, motor current information, and voltage information. This result information is then compared with the corresponding standard information to determine whether there is a fault affecting the normal opening and closing of the motor-driven high-voltage switch. The standard information consists of the displacement information, speed information, motor current information, and voltage information of the reference point during the detection process, assuming there is no fault in the motor-driven high-voltage switch. When performing the second step, it is first determined whether a normal opening and closing operation command has been received. If so, the normal opening and closing operation command is executed first. If not, the first to third steps described above are executed. During the second step, the motor is controlled to operate during the test. The motor drives the moving contact to operate within the design margin of the high-voltage switch opening and closing. The motor does not change the opening and closing state of the high-voltage switch during the entire test process.

7. The motor-driven high-voltage switch according to claim 6, characterized in that, In the third step, the displacement information of the reference point and the current information of the motor are extracted as the result information.

8. The motor-driven high-voltage switch according to claim 6 or 7, characterized in that, Once it is determined that there is a fault in the high-voltage switch driving the motor that affects its normal opening and closing, the IGBT that outputs electrical energy to the motor is blocked.

9. The motor-driven high-voltage switch according to claim 6 or 7, characterized in that, The second step described above is not performed within the normal opening and closing time of the high-voltage switch driven by the motor.

10. The motor-driven high-voltage switch according to claim 6 or 7, characterized in that, During the test, the current value of the drive motor (12) is less than the current value of the drive motor (12) when it is normally opening and closing.

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