Motion monitoring system and method for high-voltage direct-current open-circuit rapid mechanical switch

Abstract

The invention discloses a motion monitoring system and method for a high-voltage direct-current open-circuit rapid mechanical switch, and relates to the technical field of electric power, and the system is characterized in that a displacement measurement plate is connected with a transmission rod of the rapid mechanical switch, the displacement measurement plate is horizontally arranged, a reflection plate is located below the displacement measurement plate, and the included angle between the reflection plate and the horizontal plane is 45 degrees; the laser distance measuring device is externally arranged on the rapid mechanical switch, a laser beam emitted by the laser distance measuring device is reflected to the displacement measuring plate through the reflecting plate and is in the horizontal direction, and the displacement control background is connected with the laser distance measuring device and the direct-current circuit breaker control background. The requirement for the installation accuracy of the laser distance measuring device is low, the laser distance measuring device can be externally arranged on the rapid mechanical switch through the arrangement of the reflecting plate, vibration and electromagnetic interference in the operation process of the rapid mechanical switch are avoided, and the accuracy of a monitoring result is improved; moreover, the system can achieve the monitoring of the movement track of the displacement measurement plate and the measurement of the switching-on and switching-off consistency.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a motion monitoring system and method for a high-voltage direct current circuit breaker fast mechanical switch. Background Art

[0002] Flexible DC grid can realize power flow distribution and control in a large range. Compared with end-to-end flexible DC transmission, flexible DC grid has higher reliability and flexibility. Therefore, flexible DC grid is the development trend, and high-voltage DC circuit breaker is the key equipment to realize flexible DC grid.

[0003] Unlike AC circuit breakers, HVDC circuit breakers are complex systems, and fast mechanical switches are important components of HVDC circuit breaker opening and closing operations. The fast mechanical switch of HVDC circuit breakers is the core component for realizing fast opening and closing in DC circuits and withstanding the opening recovery voltage. It plays a vital role in removing DC line faults and establishing insulation distances. Once the fast mechanical switch fails to open, close, or not open or close, the HVDC circuit breaker will lose its original function. When a DC line fault occurs, the entire converter station will be locked and unable to transmit power. For this reason, it is very important to detect the operating status of the fast mechanical switch. During the opening and closing process, each break needs to act synchronously to avoid a single break from being subjected to excessive voltage or current due to different phases of operation and breakdown. The opening consistency and closing consistency measurement can ensure the synchronization of the actions of each break, thereby ensuring the reliability and safety of the entire switch. At present, position sensors are mainly used to detect the operating status, opening consistency and closing consistency of fast mechanical switches. Position sensors are set at the corresponding opening position and closing position in the fast mechanical switch to ensure that the movement state of the switch is captured. The position sensor is built into the mechanical switch. The fast mechanical switch moves quickly and has a large impact force, which will generate vibration and affect the detection of the position sensor. The fast mechanical switch may generate strong electromagnetic interference during operation, especially in a high-voltage environment. This interference may affect the signal transmission and processing of the sensor, resulting in errors in the monitoring data. The position sensor has high installation accuracy requirements. If the installation position, angle or accuracy of the sensor is not accurate enough, it may lead to inaccurate monitoring results.

[0004] Therefore, how to improve the accuracy of monitoring results is a problem that those skilled in the art need to solve. Summary of the invention

[0005] The purpose of the present application is to provide a motion monitoring system and method for a high-voltage DC circuit breaker fast mechanical switch, which is used to solve the problem that the current position sensor is not accurate enough in detecting the motion state of the fast mechanical switch.

[0006] In order to solve the above technical problems, the present application provides a motion monitoring system for a high-voltage DC circuit breaker fast mechanical switch, including: a displacement measurement board, a reflection board, a laser distance measuring device, a displacement control background and a DC circuit breaker control background;

[0007] The displacement measuring plate is connected to the transmission rod of the fast mechanical switch, the displacement measuring plate is horizontally arranged, the reflecting plate is located below the displacement measuring plate, the angle between the reflecting plate and the horizontal plane is 45°, the laser ranging device is externally arranged on the fast mechanical switch, the laser beam emitted by the laser ranging device is reflected to the displacement measuring plate by the reflecting plate, and the laser beam emitted by the laser ranging device is in the horizontal direction, the displacement control background is respectively connected to the laser ranging device and the DC circuit breaker control background, the laser ranging device is used to monitor the distance between the displacement measuring plate and itself in real time, the displacement control background is used to draw the motion trajectory of the displacement measuring plate according to the distance change monitored by the laser ranging device, and the DC circuit breaker control background is used to determine the current motion state of the fast mechanical switch according to the motion trajectory, and perform opening consistency measurement and closing consistency measurement on multiple mechanical switches.

[0008] In a feasible embodiment, it further includes a column and a horizontal platform, the top of the column is connected to the bottom of the horizontal platform, one end of the top surface of the horizontal platform is provided with the laser ranging device, and the other end of the top surface of the horizontal platform is provided with the reflector.

[0009] In a feasible embodiment, the fast mechanical switch includes a vacuum arc extinguishing chamber, a static contact and a moving contact arranged in the vacuum arc extinguishing chamber, the transmission rod, a repulsion disk, an opening coil and a closing coil, the first end of the transmission rod is connected to the moving contact, a pin hole is provided in the middle of the repulsion disk, the second end of the transmission rod passes through the repulsion disk through the pin hole to fix the repulsion disk on the transmission rod, the opening coil is provided above the repulsion disk, and the closing coil is provided below the repulsion disk.

[0010] In a feasible embodiment, the middle portion of the displacement measurement plate is fixedly connected to the transmission rod, the displacement measurement plate is parallel to the repulsion disk, and the displacement measurement plate is a hollow structure.

[0011] In a feasible embodiment, the laser ranging device includes a laser transmitter, a lens, a photoelectric detector, a signal amplifying circuit, a time measuring module, a microprocessor and a communication module. The lens is used to focus and guide the laser beam emitted by the laser transmitter. The photoelectric detector is used to receive the reflected laser beam and convert the optical signal into an electrical signal. The signal amplifying circuit is connected to the photoelectric detector. The signal amplifying circuit is used to enhance the electrical signal. The time measuring module is used to record the time interval between laser emission and laser reception. The microprocessor is connected to the time measuring module and is used to determine the distance between the displacement measuring board and the laser ranging device according to the time interval and the speed of light. The communication module is respectively connected to the microprocessor and the displacement control background.

[0012] In a feasible embodiment, the DC circuit breaker control background is a dual redundant configuration, and the displacement control background is respectively connected to the two DC circuit breaker control backgrounds.

[0013] The present application also provides a motion monitoring method for a high-voltage direct current circuit breaker fast mechanical switch, which is applied to the motion monitoring system for the high-voltage direct current circuit breaker fast mechanical switch, comprising:

[0014] Sending a switch-on / off command to the laser distance measuring device via the displacement control background to control the laser distance measuring device to monitor the distance between the displacement measuring plate and the laser distance measuring device in real time;

[0015] Acquire the motion trajectory of the displacement measurement board sent by the displacement control background; wherein the motion trajectory is drawn by the displacement control background according to the distance change monitored by the laser distance measuring device;

[0016] The current motion state of the fast mechanical switch is determined according to the motion trajectory, and the opening consistency measurement and closing consistency measurement are performed on multiple mechanical switches.

[0017] In a feasible embodiment, the performing opening consistency measurement on a plurality of mechanical switches includes:

[0018] Determine the opening time of each mechanical switch from the start of opening to the end of opening according to the motion trajectory;

[0019] If all of the opening times are within a preset range, the multiple mechanical switches meet the opening consistency requirement;

[0020] If the opening time is outside the preset range, the plurality of mechanical switches do not meet the opening consistency requirement.

[0021] In a feasible embodiment, the performing opening consistency measurement on a plurality of mechanical switches includes:

[0022] Determine, according to the motion trajectory, a first time point corresponding to the start of opening of each mechanical switch and a second time point corresponding to the end of opening;

[0023] Subtract the maximum value from the minimum value at the first time point to obtain a first difference, and determine whether the first difference is less than a first preset value;

[0024] If the first difference is greater than or equal to the first preset value, the plurality of mechanical switches do not meet the opening consistency requirement;

[0025] If the first difference is less than the first preset value, subtract the maximum value from the minimum value at the second time point to obtain a second difference, and determine whether the second difference is less than the second preset value;

[0026] If the second difference is greater than or equal to the second preset value, the plurality of mechanical switches do not meet the opening consistency requirement;

[0027] If the second difference is less than the second preset value, the plurality of mechanical switches meet the opening consistency requirement.

[0028] In a feasible embodiment, after obtaining the motion trajectory of the displacement measurement board sent by the displacement control background, the method further includes:

[0029] Determine a first motion curve from the start of opening to the end of opening, and a second motion curve from the start of closing to the end of closing, for each mechanical switch according to the motion trajectory;

[0030] The first motion curve and the second motion curve are compared with their respective corresponding standard curves, and a hidden danger alarm is generated according to the comparison result.

[0031] The present application provides a motion monitoring system for a high-voltage direct current circuit breaker fast mechanical switch, comprising: a displacement measuring plate, a reflecting plate, a laser ranging device, a displacement control background and a direct current circuit breaker control background; the displacement measuring plate is connected to a transmission rod of the fast mechanical switch, the displacement measuring plate is arranged horizontally, the reflecting plate is located below the displacement measuring plate, the angle between the reflecting plate and the horizontal plane is 45°, the laser ranging device is externally arranged on the fast mechanical switch, the laser beam emitted by the laser ranging device is reflected to the displacement measuring plate via the reflecting plate, and the laser beam emitted by the laser ranging device is in a horizontal direction, the displacement control background is respectively connected to the laser ranging device and the direct current circuit breaker control background, the laser ranging device is used to monitor the distance between the displacement measuring plate and itself in real time, the displacement control background is used to draw a motion trajectory of the displacement measuring plate according to the distance change monitored by the laser ranging device, the direct current circuit breaker control background is used to determine the current motion state of the fast mechanical switch according to the motion trajectory, and to perform opening consistency measurement and closing consistency measurement on multiple mechanical switches. This application has low requirements for the installation accuracy of the laser distance measuring device. By setting up a reflector, the laser distance measuring device can be placed outside the fast mechanical switch, thereby effectively avoiding vibration and electromagnetic interference during the operation of the fast mechanical switch and improving the accuracy of the monitoring results. In addition, the displacement control background can draw the motion trajectory of the displacement measurement plate based on the distance change monitored by the laser distance measuring device. According to the motion trajectory, the dynamic parameters of the fast mechanical switch during the opening and closing process, such as the opening and closing time, speed and stroke, can be conveniently monitored.

[0032] The beneficial effects of the motion monitoring method of a high-voltage DC circuit breaker fast mechanical switch provided in the present application correspond to the system, and the effects are as above. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] FIG1 is a structural diagram of a motion monitoring system for a high-voltage DC circuit breaker fast mechanical switch provided in an embodiment of the present application;

[0035] FIG2 is a schematic diagram of a displacement control background and a DC circuit breaker control background provided in an embodiment of the present application;

[0036] FIG3 is a flow chart of a method for monitoring the movement of a high-voltage DC circuit breaker fast mechanical switch provided in an embodiment of the present application;

[0037] The accompanying drawings are marked as follows: 1-displacement measuring plate, 2-reflection plate, 3-laser ranging device, 4-displacement control backstage, 5-DC circuit breaker control backstage, 6-column, 7-horizontal platform, 8-vacuum interrupter, 9-static contact, 10-moving contact, 11-transmission rod, 12-repulsion disk, 13-opening coil, 14-closing coil. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] The core of the present application is to provide a motion monitoring system and method for a high-voltage DC circuit breaker fast mechanical switch, so as to improve the accuracy of the monitoring results.

[0040] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0041] FIG1 is a structural diagram of a motion monitoring system for a high-voltage DC circuit breaker fast mechanical switch provided by an embodiment of the present application. As shown in FIG1 , the motion monitoring system for a high-voltage DC circuit breaker fast mechanical switch includes: a displacement measurement board 1, a reflection board 2, a laser ranging device 3, a displacement control background 4 and a DC circuit breaker control background 5; the displacement measurement board 1 is connected to a transmission rod 11 of the fast mechanical switch, the displacement measurement board 1 is horizontally arranged, the reflection board 2 is located below the displacement measurement board 1, and the angle between the reflection board 2 and the horizontal plane is 45°; the laser ranging device 3 is externally arranged on the fast mechanical switch, and the laser ranging device 3 emits The laser beam is reflected by the reflection plate 2 to the displacement measuring plate 1, and the laser beam emitted by the laser ranging device 3 is in the horizontal direction. The displacement control background 4 is respectively connected to the laser ranging device 3 and the DC circuit breaker control background 5. The laser ranging device 3 is used to monitor the distance between the displacement measuring plate 1 and itself in real time. The displacement control background 4 is used to draw the motion trajectory of the displacement measuring plate 1 according to the distance change monitored by the laser ranging device 3. The DC circuit breaker control background 5 is used to determine the current motion state of the fast mechanical switch according to the motion trajectory, and perform opening consistency measurement and closing consistency measurement on multiple mechanical switches.

[0042] In the embodiment of the present application, the connection between the displacement measurement plate 1 and the transmission rod 11 can be detachably connected or fixedly connected. Specifically, the middle part of the displacement measurement plate 1 is fixedly connected to the transmission rod 11, the displacement measurement plate 1 is parallel to the repulsion disk 12, and the displacement measurement plate 1 is a hollow structure. The fixed connection method can ensure that the displacement measurement plate 1 is firmly fixed on the transmission rod 11 to prevent the movement of the transmission rod 11 from shaking the displacement measurement plate 1 off; the displacement measurement plate 1 is a hollow structure, which can reduce its own weight and avoid hindering the movement of the transmission rod 11; the displacement measurement plate 1 is installed on the transmission rod 11 of the fast mechanical switch, which can truly reflect the movement trajectory of the moving contact of the fast mechanical switch.

[0043] In the embodiment of the present application, the angle between the reflective plate 2 and the horizontal plane is 45°, the displacement measuring plate 1 is horizontally arranged, and the laser beam emitted by the laser ranging device 3 is in a horizontal direction, so the laser beam reflected by the reflective plate 2 is perpendicular to the displacement measuring plate 1, and the displacement control background 4 can directly determine the displacement change of the displacement measuring plate 1 according to the distance detected by the laser ranging device 3.

[0044] In the embodiment of the present application, the laser distance measuring device 3 is placed outside the fast mechanical switch, which can effectively avoid the vibration caused by the movement of the fast mechanical switch and the strong electromagnetic influence on the laser distance measuring device 3 generated by the fast mechanical switch during operation, thereby improving the accuracy of the monitoring result. The embodiment of the present application does not limit the specific structure of the laser distance measuring device 3. The laser distance measuring device 3 may include a laser transmitter, a lens, a photodetector, a signal amplification circuit, a time measurement module, a microprocessor and a communication module. The lens is used to focus and guide the laser beam emitted by the laser transmitter. The photodetector is used to receive the reflected laser beam and convert the optical signal into an electrical signal. The signal amplification circuit is connected to the photodetector, and the signal amplification circuit is used to enhance the electrical signal. The time measurement module is used to record the time interval between laser emission and laser reception. The microprocessor is connected to the time measurement module to determine the distance between the displacement measurement board 1 and the laser distance measuring device 3 according to the time interval and the speed of light. The communication module is connected to the microprocessor and the displacement control background 4 respectively. The laser distance measuring device 3 can achieve a measurement accuracy of 0.1mm and accurately reflect the motion state of the fast mechanical switch.

[0045] The embodiment of the present application does not limit the number of DC circuit breaker control backgrounds 5. Specifically, FIG. 2 is a schematic diagram of a displacement control background 4 and a DC circuit breaker control background 5 provided in the embodiment of the present application. As shown in FIG. 2 , the DC circuit breaker control background 5 is a dual redundant configuration, and the displacement control background 4 is respectively connected to two DC circuit breaker control backgrounds 5. The dual redundant configuration is designed to be: even if one of the DC circuit breaker control backgrounds 5 fails, the other can still work normally, thereby ensuring the continuous operation of the entire system. This configuration can minimize the impact caused by equipment failure and improve the reliability of the system. How the DC circuit breaker control background 5 determines the current motion state of the fast mechanical switch according to the motion trajectory, and how to perform opening consistency measurement and closing consistency measurement on multiple mechanical switches will be further introduced in the embodiment of the method.

[0046] Based on the above embodiment, the embodiment of the present application further includes a column 6 and a horizontal platform 7, the top of the column 6 is connected to the bottom of the horizontal platform 7, a laser distance measuring device 3 is provided at one end of the top surface of the horizontal platform 7, and a reflector 2 is provided at the other end of the top surface of the horizontal platform 7. The laser distance measuring device 3 and the reflector 2 can be conveniently installed by providing the column 6 and the horizontal platform 7.

[0047] Based on the above embodiments, the fast mechanical switch in the embodiments of the present application includes a vacuum interrupter 8, a static contact 9 and a moving contact 10 arranged in the vacuum interrupter 8, a transmission rod 11, a repulsion disk 12, an opening coil 13 and a closing coil 14, the first end of the transmission rod 11 is connected to the moving contact 10, a pin hole is provided in the middle of the repulsion disk 12, the second end of the transmission rod 11 passes through the repulsion disk 12 through the pin hole, so that the repulsion disk 12 is fixed on the transmission rod 11, the opening coil 13 is provided above the repulsion disk 12, and the closing coil 14 is provided below the repulsion disk 12. In order to ensure the stability and reliability of the connection, the connection between the pin hole and the transmission rod 11 may also require additional fixing elements, such as pins, bolts, nuts, snap rings or welding, etc., which can provide additional clamping force or holding force to ensure that the repulsion disk 12 is firmly fixed on the transmission rod 11. Electromagnetic repulsion is generated between the opening coil 13 , the closing coil 14 and the repulsion disk 12 , pushing the repulsion disk 12 to drive the transmission rod 11 to move. The movement displacement of the transmission rod 11 can truly reflect the displacement of the moving contact 10 .

[0048] A motion monitoring system for a high-voltage direct current circuit breaker fast mechanical switch provided in an embodiment of the present application comprises: a displacement measuring plate, a reflecting plate, a laser ranging device, a displacement control background and a direct current circuit breaker control background; the displacement measuring plate is connected to a transmission rod of the fast mechanical switch, the displacement measuring plate is arranged horizontally, the reflecting plate is located below the displacement measuring plate, the angle between the reflecting plate and the horizontal plane is 45°, the laser ranging device is externally arranged on the fast mechanical switch, the laser beam emitted by the laser ranging device is reflected to the displacement measuring plate via the reflecting plate, and the laser beam emitted by the laser ranging device is in a horizontal direction, the displacement control background is respectively connected to the laser ranging device and the direct current circuit breaker control background, the laser ranging device is used to monitor the distance between the displacement measuring plate and itself in real time, the displacement control background is used to draw a motion trajectory of the displacement measuring plate according to the distance change monitored by the laser ranging device, the direct current circuit breaker control background is used to determine the current motion state of the fast mechanical switch according to the motion trajectory, and to perform opening consistency measurement and closing consistency measurement on multiple mechanical switches. This application has low requirements for the installation accuracy of the laser distance measuring device. By setting up a reflector, the laser distance measuring device can be placed outside the fast mechanical switch, thereby effectively avoiding vibration and electromagnetic interference during the operation of the fast mechanical switch and improving the accuracy of the monitoring results. In addition, the displacement control background can draw the motion trajectory of the displacement measurement plate based on the distance change monitored by the laser distance measuring device. According to the motion trajectory, the dynamic parameters of the fast mechanical switch during the opening and closing process, such as the opening and closing time, speed and stroke, can be conveniently monitored.

[0049] FIG3 is a flow chart of a method for monitoring the movement of a high-voltage direct current circuit breaker fast mechanical switch provided by an embodiment of the present application. As shown in FIG3 , the method for monitoring the movement of a high-voltage direct current circuit breaker fast mechanical switch is applied to the above-mentioned system for monitoring the movement of a high-voltage direct current circuit breaker fast mechanical switch, and includes:

[0050] S10: Sending a switch-on and switch-off command to the laser distance measuring device via the displacement control background to control the laser distance measuring device to monitor the distance between the displacement measuring board and the laser distance measuring device in real time.

[0051] S11: Acquire the motion trajectory of the displacement measurement board sent by the displacement control background; wherein the motion trajectory is drawn by the displacement control background according to the distance change monitored by the laser distance measuring device.

[0052] S12: Determine the current motion state of the fast mechanical switch according to the motion trajectory, and perform opening consistency measurement and closing consistency measurement on multiple mechanical switches.

[0053] In step S10, the displacement control background receives the opening and closing command of the DC circuit breaker control background and sends it to the laser distance measuring device with a very short delay. The laser distance measuring device detects the distance between the displacement measuring board and the laser distance measuring device in real time and sends it to the displacement control background.

[0054] In step S12, the current motion state of the fast mechanical switch is determined according to the motion trajectory. Specifically, the horizontal coordinate of the motion trajectory is time, and the vertical coordinate of the motion trajectory is the displacement of the displacement measurement plate. If it rises from one horizontal line and then reaches another horizontal line, it means that the mechanical switch is in the closed state; if it drops from one horizontal line and then reaches another horizontal line, it means that the mechanical switch is in the open state.

[0055] Regarding the opening consistency measurement and closing consistency measurement of multiple mechanical switches, the details are as follows.

[0056] The first type: the opening consistency measurement of multiple mechanical switches includes: determining the opening time of each mechanical switch from the beginning to the end of the opening according to the motion trajectory; if all the opening times are within the preset range, the multiple mechanical switches meet the opening consistency requirements; if there is an opening time outside the preset range, the multiple mechanical switches do not meet the opening consistency requirements. The preset range can be 1.8ms±0.2. Example 1: Mechanical switch 1 opening time 1.8ms, mechanical switch 2 opening time 1.9ms, mechanical switch 3 opening time 1.7ms, mechanical switch 4 opening time 1.8ms, mechanical switch 5 opening time 2.1ms, Example 1 does not meet the opening consistency requirements. Example 2: Mechanical switch 1 opening time 1.8ms, mechanical switch 2 opening time 1.9ms, mechanical switch 3 opening time 1.7ms, mechanical switch 4 opening time 1.8ms, mechanical switch 5 opening time 1.9ms, Example 2 meets the opening consistency requirements. The closing consistency measurement of multiple mechanical switches includes: determining the closing time taken by each mechanical switch from the beginning to the end of closing according to the motion trajectory; if all the closing times are within a preset range, the multiple mechanical switches meet the closing consistency requirements; if there is a closing time outside the preset range, the multiple mechanical switches do not meet the closing consistency requirements.

[0057] The second type: performing opening consistency measurement on multiple mechanical switches includes: determining a first time point corresponding to the start of opening of each mechanical switch and a second time point corresponding to the end of opening according to the motion trajectory; subtracting the maximum value and the minimum value in the first time point to obtain a first difference, and judging whether the first difference is less than a first preset value; if the first difference is greater than or equal to the first preset value, the multiple mechanical switches do not meet the opening consistency requirement; if the first difference is less than the first preset value, subtracting the maximum value and the minimum value in the second time point to obtain a second difference, and judging whether the second difference is less than the second preset value; if the second difference is greater than or equal to the second preset value, the multiple mechanical switches do not meet the opening consistency requirement; if the second difference is less than the second preset value, the multiple mechanical switches meet the opening consistency requirement. The closing consistency measurement of multiple mechanical switches includes: determining a third time point corresponding to the start of closing of each mechanical switch and a fourth time point corresponding to the end of closing according to the motion trajectory; subtracting the maximum value and the minimum value in the third time point to obtain a third difference, and judging whether the third difference is less than a third preset value; if the third difference is greater than or equal to the third preset value, the multiple mechanical switches do not meet the closing consistency requirement; if the third difference is less than the third preset value, subtracting the maximum value and the minimum value in the fourth time point to obtain a fourth difference, and judging whether the fourth difference is less than the fourth preset value; if the fourth difference is greater than or equal to the fourth preset value, the multiple mechanical switches do not meet the closing consistency requirement; if the fourth difference is less than the fourth preset value, the multiple mechanical switches meet the closing consistency requirement.

[0058] Based on the above embodiments, after the embodiment of the present application obtains the motion trajectory of the displacement measurement plate sent by the displacement control background, it also includes: determining the first motion curve from the start of opening to the end of opening of each mechanical switch according to the motion trajectory, and the second motion curve from the start of closing to the end of closing; comparing the first motion curve and the second motion curve with their respective corresponding standard curves, and generating a hidden danger alarm according to the comparison result. If the first motion curve and the second motion curve are the same as their respective corresponding standard curves, it means that there is no abnormality in the mechanical switch. If the first motion curve and the second motion curve are different from their respective corresponding standard curves, the first motion curve and the second motion curve have large fluctuations, and a hidden danger alarm can be issued. The opening speed of the mechanical switch can also be determined according to the slope of the first motion curve, and the closing speed of the mechanical switch can be determined according to the slope of the second motion curve. If the opening speed and the closing speed are abnormal, it may indicate that the mechanical parts have problems such as wear or jamming, so that the hidden dangers of the fast mechanical switch motion mechanism can be reflected in advance.

[0059] A motion monitoring method for a high-voltage DC circuit breaker fast mechanical switch provided in an embodiment of the present application is applied to the motion monitoring system of the high-voltage DC circuit breaker fast mechanical switch, including: sending a switch-on and switch-off command to a laser distance measuring device through a displacement control background to control the laser distance measuring device to monitor the distance between the displacement measuring plate and the laser distance measuring device in real time; obtaining the motion trajectory of the displacement measuring plate sent by the displacement control background; wherein the motion trajectory is obtained by drawing the displacement control background according to the distance change monitored by the laser distance measuring device; determining the current motion state of the fast mechanical switch according to the motion trajectory, and performing switch-off consistency measurement and switch-off consistency measurement on multiple mechanical switches. The present application has low requirements on the installation accuracy of the laser distance measuring device. By setting a reflector, the laser distance measuring device can be placed outside the fast mechanical switch, thereby effectively avoiding vibration and electromagnetic interference during the operation of the fast mechanical switch, and improving the accuracy of the monitoring results. In addition, the displacement control background can draw the motion trajectory of the displacement measuring plate according to the distance change monitored by the laser distance measuring device, and the dynamic parameters of the fast mechanical switch in the switch-off and switch-off process, such as switch-off and switch-off time, speed and stroke, can be conveniently monitored according to the motion trajectory.

[0060] Finally, the present application also provides an embodiment corresponding to a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps described in the motion monitoring method of a high-voltage DC circuit breaker fast mechanical switch in the above method embodiment are implemented.

[0061] It is understandable that if the method in the above embodiment is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

[0062] The above is a detailed introduction to a motion monitoring system and method for a high-voltage DC circuit breaker fast mechanical switch provided by the present application. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referenced to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

[0063] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A motion monitoring system for a high-voltage direct current circuit breaker fast mechanical switch, characterized in that: include: Displacement measurement board, reflection board, laser distance measuring device, displacement control background and DC circuit breaker control background; The displacement measuring plate is connected to the transmission rod of the fast mechanical switch, the displacement measuring plate is horizontally arranged, the reflecting plate is located below the displacement measuring plate, the angle between the reflecting plate and the horizontal plane is 45°, the laser ranging device is externally arranged on the fast mechanical switch, the laser beam emitted by the laser ranging device is reflected to the displacement measuring plate by the reflecting plate, and the laser beam emitted by the laser ranging device is in the horizontal direction, the displacement control background is respectively connected to the laser ranging device and the DC circuit breaker control background, the laser ranging device is used to monitor the distance between the displacement measuring plate and itself in real time, the displacement control background is used to draw the motion trajectory of the displacement measuring plate according to the distance change monitored by the laser ranging device, and the DC circuit breaker control background is used to determine the current motion state of the fast mechanical switch according to the motion trajectory, and perform opening consistency measurement and closing consistency measurement on multiple mechanical switches.

2. The motion monitoring system of the high-voltage direct current circuit breaker fast mechanical switch according to claim 1 is characterized in that: It also includes a column and a horizontal platform, the top of the column is connected to the bottom of the horizontal platform, one end of the top surface of the horizontal platform is provided with the laser ranging device, and the other end of the top surface of the horizontal platform is provided with the reflector.

3. The motion monitoring system of the high-voltage direct current circuit breaker fast mechanical switch according to claim 1, characterized in that: The fast mechanical switch includes a vacuum interrupter, a static contact and a moving contact arranged in the vacuum interrupter, the transmission rod, a repulsion disk, an opening coil and a closing coil. The first end of the transmission rod is connected to the moving contact, a pin hole is provided in the middle of the repulsion disk, and the second end of the transmission rod passes through the repulsion disk through the pin hole so that the repulsion disk is fixed on the transmission rod. The opening coil is provided above the repulsion disk, and the closing coil is provided below the repulsion disk.

4. The motion monitoring system for a high-voltage direct current circuit breaker fast mechanical switch according to claim 3 is characterized in that: The middle part of the displacement measuring plate is fixedly connected to the transmission rod, the displacement measuring plate is parallel to the repulsion disk, and the displacement measuring plate is a hollow structure.

5. The motion monitoring system for a high-voltage direct current circuit breaker fast mechanical switch according to claim 1, characterized in that: The laser distance measuring device includes a laser transmitter, a lens, a photoelectric detector, a signal amplifying circuit, a time measuring module, a microprocessor and a communication module. The lens is used to focus and guide the laser beam emitted by the laser transmitter. The photoelectric detector is used to receive the reflected laser beam and convert the optical signal into an electrical signal. The signal amplifying circuit is connected to the photoelectric detector. The signal amplifying circuit is used to enhance the electrical signal. The time measuring module is used to record the time interval between laser emission and laser reception. The microprocessor is connected to the time measuring module and is used to determine the distance between the displacement measuring board and the laser distance measuring device according to the time interval and the speed of light. The communication module is respectively connected to the microprocessor and the displacement control background.

6. The motion monitoring system of a high-voltage direct current circuit breaker fast mechanical switch according to claim 1, characterized in that: The DC circuit breaker control backend is a dual redundant configuration, and the displacement control backend is respectively connected to the two DC circuit breaker control backends.

7. A method for monitoring the movement of a high-voltage direct current circuit breaker fast mechanical switch, characterized in that: A motion monitoring system for a high-voltage direct current circuit breaker fast mechanical switch according to any one of claims 1 to 6, comprising: Sending a switch-on / off command to the laser distance measuring device via the displacement control background to control the laser distance measuring device to monitor the distance between the displacement measuring plate and the laser distance measuring device in real time; Acquire the motion trajectory of the displacement measurement board sent by the displacement control background; wherein the motion trajectory is drawn by the displacement control background according to the distance change monitored by the laser distance measuring device; The current motion state of the fast mechanical switch is determined according to the motion trajectory, and the opening consistency measurement and closing consistency measurement are performed on multiple mechanical switches.

8. The method for monitoring the movement of a high-voltage direct current circuit breaker fast mechanical switch according to claim 7, characterized in that: The method of measuring the opening consistency of a plurality of mechanical switches comprises: Determine the opening time of each mechanical switch from the start of opening to the end of opening according to the motion trajectory; If all of the opening times are within a preset range, the multiple mechanical switches meet the opening consistency requirement; If the opening time is outside the preset range, the plurality of mechanical switches do not meet the opening consistency requirement.

9. The method for monitoring the movement of a high-voltage direct current circuit breaker fast mechanical switch according to claim 7, characterized in that: The method of measuring the opening consistency of a plurality of mechanical switches comprises: Determine, according to the motion trajectory, a first time point corresponding to the start of opening of each mechanical switch and a second time point corresponding to the end of opening; Subtract the maximum value from the minimum value at the first time point to obtain a first difference, and determine whether the first difference is less than a first preset value; If the first difference is greater than or equal to the first preset value, the plurality of mechanical switches do not meet the opening consistency requirement; If the first difference is less than the first preset value, subtract the maximum value from the minimum value at the second time point to obtain a second difference, and determine whether the second difference is less than the second preset value; If the second difference is greater than or equal to the second preset value, the plurality of mechanical switches do not meet the opening consistency requirement; If the second difference is less than the second preset value, the plurality of mechanical switches meet the opening consistency requirement.

10. The method for monitoring the movement of a high-voltage direct current circuit breaker fast mechanical switch according to claim 7, characterized in that: After acquiring the motion trajectory of the displacement measurement board sent by the displacement control background, the method further includes: Determine a first motion curve from the start of opening to the end of opening, and a second motion curve from the start of closing to the end of closing, for each mechanical switch according to the motion trajectory; The first motion curve and the second motion curve are compared with their respective corresponding standard curves, and a hidden danger alarm is generated according to the comparison result.

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