Method for monitoring the open / closed state of a switch

Abstract

The present invention provides a method for monitoring the switching status of a switch, comprising: selecting several monitoring points on a rotary element of a switch; obtaining a standard movement trajectory of each monitoring point during the switching process of the switch; installing a trajectory collection module based on the standard movement trajectory of each monitoring point to obtain actual movement data of the monitoring points during the switching process; using the trajectory collection modules to obtain actual movement data of the monitoring points in one-to-one correspondence in response to a switch switching command, where the several predetermined positions include a start position and an end position; obtaining several switching parameters during the switching process of the rotary element based on the actual movement data of the several monitoring points on the rotary element of the same phase; and determining whether the switch has been fully opened or closed based on the several switching parameters of the rotary elements of all phases. The present invention solves the technical problem of the inconvenience of monitoring the switching status and synchronization of a three-phase switch in the prior art.

Description

[Technical Field]

[0001] The present invention relates to the technical field of switch state monitoring, and more particularly to a method for monitoring the switching state of a switch. [Background technology]

[0002] Switchgear are primary power devices widely used in power distribution systems, used to open and close circuits. Their simple operating principle, high flexibility, and reliability have led to their widespread use. They isolate voltages within circuits, ensuring safety during inspections. Before inspecting a specific piece of equipment or a portion of a circuit, first disconnect the switches on both sides of the equipment or that portion of the circuit to isolate the voltage on both sides and ensure a clear break-off point for the circuit. Then, after a power outage, an additional ground wire must be installed on the equipment or portion of the circuit to be inspected. However, over time or due to external environmental factors, switchgears can become rusty, stuck, or improperly inspected or adjusted, sometimes preventing the motor from operating properly during the opening and closing process, resulting in the operating switch reaching its intended position despite the auxiliary contacts being in the correct position. This can easily lead to operational errors. Summary of the Invention [Problem to be solved by the invention]

[0003] SUMMARY OF THE INVENTION In response to the deficiencies of the prior art, the present invention provides a method for monitoring the switching state of a switch, which solves the problem that it is difficult to monitor the switching state and synchronism of a three-phase switch in the prior art. [Means for solving the problem]

[0004] According to the method for monitoring the switching state of a switch of the present invention, the monitoring method includes selecting several monitoring points on a rotating body of a switch, and distributing the several monitoring points at intervals along the extending direction of the rotating body; obtaining a standard movement trajectory of each monitoring point during the switching process of the switch; installing a trajectory collection module based on the standard movement trajectory of each monitoring point to obtain actual movement data of the monitoring point during the switching process; obtaining actual movement data of the several monitoring points in one-to-one correspondence using the several trajectory collection modules in response to a switching command of the switch, wherein the actual movement data includes the time and speed at which the monitoring point reaches several predetermined positions on the standard movement trajectory, and the several predetermined positions include a start position and an end position; obtaining several switching parameters during the switching process of the rotating body based on the actual movement data of the several monitoring points on the rotating body of the same phase; and determining whether the switch has been completely opened or closed based on the several switching parameters of the rotating bodies of all phases.

[0005] Furthermore, acquiring several opening and closing parameters during the opening and closing process of the rotating body includes acquiring the time from the start of operation to the end of operation of each monitoring point based on the time it takes for each monitoring point to reach several predetermined positions on the corresponding standard movement trajectory, acquiring the average value of the times from the start of operation to the end of operation of all monitoring points as the operation time of the rotating body, acquiring the start speed, end speed and mid-way speed of each monitoring point based on the speed at which each monitoring point reaches several predetermined positions on the standard movement trajectory, acquiring the average value of the start speeds of all monitoring points as the start operation speed of the rotating body, acquiring the average value of the mid-way speeds of all monitoring points as the mid-operation speed of the rotating body, and acquiring the average value of the end speeds of all monitoring points as the end operation speed of the rotating body.

[0006] Furthermore, determining whether the switch is fully opened includes satisfying a first opening condition when the speeds of the starting movements of the rotating bodies of each phase are all greater than a first set starting speed, satisfying a second opening condition when the speed difference between the intermediate movements of the rotating bodies of any two phases is both smaller than the first set speed difference, satisfying a third opening condition when the speeds of the ending movements of the rotating bodies of each phase are both smaller than the first set ending speed, satisfying a fourth opening condition when the difference between the operation times of the rotating bodies of any two phases is both smaller than the first set time, satisfying a fifth opening condition when the difference between the start times of the operation of the rotating bodies of any two phases is both smaller than the second set time, and determining that the switch is fully opened when all of the first opening condition, second opening condition, third opening condition, fourth opening condition, and fifth opening condition are satisfied.

[0007] Furthermore, determining whether the switch is completely closed includes satisfying the first closing condition when the speeds of the starting movements of the rotating bodies of each phase are all greater than a second set starting speed, satisfying the second closing condition when the difference in the speeds of the intermediate movements of the rotating bodies of any two phases is less than the difference in the second set speeds, satisfying the third closing condition when the speeds of the ending movements of the rotating bodies of each phase are all greater than the second set ending speed, satisfying the fourth closing condition when the difference in the operation times of the rotating bodies of any two phases is less than the third set time, satisfying the fifth closing condition when the difference in the end times of the operation of the rotating bodies of any two phases is less than the fourth set time, and determining that the switch is completely closed when all of the first closing condition, second closing condition, third closing condition, fourth closing condition, and fifth closing condition are satisfied.

[0008] Furthermore, the intermediate speed includes an average value of the speed at several predetermined positions other than the start position and end position of the monitoring point on the standard movement trajectory.

[0009] Furthermore, the trajectory collection module includes a group of several infrared transmitter-receivers and processors, and the several infrared transmitter-receiver groups are installed in one-to-one correspondence at several predetermined positions on the standard movement trajectory of the corresponding monitoring point, and each infrared transmitter-receiver group includes an infrared receiver and an infrared transmitter, and the infrared receivers and infrared transmitters are arranged in one-to-one correspondence on both sides of the rotating body, and the processor responds to an opening / closing command and controls the multiple infrared transmitters to transmit infrared rays to the corresponding infrared receivers, and sends the received signals from the infrared receiver to the processor, and the processor receives the intermittent data of each received signal to obtain the time and speed at which the monitoring point reaches each predetermined position.

[0010] Further, obtaining the time and speed at which the monitoring point reaches each predetermined position includes receiving signal intermittent data when the monitoring point reaches the predetermined position, the intermittent data including an intermittent start time, an intermittent end time, and an intermittent duration; obtaining the median of the intermittent start time and the intermittent end time as the time at which the monitoring point reaches the predetermined position; obtaining the width of the rotating body at the corresponding position of the monitoring point; and obtaining the speed of the monitoring point at the predetermined position based on the intermittent duration.

[0011] Furthermore, at least four predetermined positions are set on each standard movement trajectory.

[0012] Furthermore, at least two monitoring points are installed on the same rotating body.

[0013] Furthermore, a monitoring point is provided on the rotating body at a location close to the movable contact. [Effects of the Invention]

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] In this embodiment, multiple monitoring points are set on the rotary body of the switch for each phase, and multiple predetermined positions are set on the standard movement trajectory of each monitoring point, and a trajectory collection module is placed at each predetermined position to obtain actual movement data when the monitoring point on the rotary body reaches the predetermined position, so that the actual movement data is more accurate and several switching parameters during the opening and closing process of the rotary body are obtained from the actual movement data of the rotary body for each phase, and it is easy to determine whether the switch has been fully opened or closed based on the several switching parameters, solving the technical problem of the inconvenience of monitoring the opening and closing status and synchronization of a three-phase switch in the prior art. [Brief explanation of the drawings]

[0016] [Figure 1] 2 is a flowchart of a method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] The technical solution of the present invention will be further described below with reference to the drawings and examples.

[0018] As shown in FIG. 1, a method for monitoring the switching state of a switch includes selecting several monitoring points on a rotating body of the switch, and distributing the several monitoring points at intervals along the extending direction of the rotating body; obtaining a standard movement trajectory of each monitoring point during the switching process of the switch; installing a trajectory collection module based on the standard movement trajectory of each monitoring point to obtain actual movement data of the monitoring points during the switching process; obtaining actual movement data of the several monitoring points in one-to-one correspondence using the multiple trajectory collection modules in response to a switching command of the switch, wherein the actual movement data includes the time and speed at which the monitoring point reaches several predetermined positions on the standard movement trajectory, and the several predetermined positions include a start position and an end position; obtaining several switching parameters during the switching process of the rotating body based on the actual movement data of the multiple monitoring points on the rotating body of the same phase; and determining whether the switch has been fully opened or closed based on the several switching parameters of the rotating bodies of all phases.

[0019] The specific implementation process of this embodiment includes the following:

[0020] A switchgear is a switching device primarily used for power isolation, switching operations, and the connection and disconnection of small-current circuits, and does not have arc-extinguishing capabilities. When in the open position, a switchgear has a specified insulation distance between its contacts and a clear interruption indicator. When in the closed position, it is capable of conducting current under normal circuit conditions and under abnormal conditions (e.g., short circuit) for a specified period of time. It is generally used as a high-voltage switchgear, i.e., a switchgear with a rated voltage of 1 kV or higher. While its operating principle and structure are relatively simple, its large usage volume and high operational reliability requirements have a significant impact on the design, construction, and safe operation of substations and power plants. A key feature of a switchgear is that it does not have arc-extinguishing capabilities and can only make and break circuits when there is no load current.

[0021] A switchgear has several states, mainly a closed state, an open state, a partially closed state, a partially open state, and operation with an open phase.

[0022] Therefore, in the switching process of the three-phase switch, there is a high requirement for synchronization, and if the switching is not complete or the synchronization is relatively poor, it is easy to cause a power safety accident.

[0023] Based on the structure of the rotating body of the switch, at least two monitoring points are installed on the same rotating body. In this embodiment, three monitoring points are installed on the rotating body, one of which is installed near the movable contact of the rotating body.

[0024] According to the opening and closing rules of the rotating body, a standard movement trajectory corresponding to each monitoring point is obtained, and at least four predetermined positions are set on each standard movement trajectory. Actual movement data is obtained when the rotating body reaches each predetermined position, and several opening and closing parameters of the corresponding rotating body of each phase are obtained based on the actual movement data, and it is determined whether the switch is fully opened or closed.

[0025] Here, acquiring several opening and closing parameters during the opening and closing process of the rotating body includes acquiring the time from the start of operation to the end of operation for each monitoring point based on the time it takes for each monitoring point to reach several predetermined positions on the corresponding standard movement trajectory, acquiring the average of the times from the start of operation to the end of operation for all monitoring points as the movement time of the rotating body, acquiring the start speed, end speed, and intermediate speed of each monitoring point based on the speed at which each monitoring point reaches several predetermined positions on the standard movement trajectory, acquiring the average of the start speeds of all monitoring points as the speed of the starting movement of the rotating body, acquiring the average of the intermediate speeds of all monitoring points as the speed of the intermediate movement of the rotating body, and acquiring the average of the end speeds of all monitoring points as the speed of the ending movement of the rotating body. The intermediate speeds include average values ​​of the speeds of the monitoring points at several predetermined positions other than the start and end positions on the standard movement trajectory.

[0026] In this embodiment, obtaining the time and speed at which the monitoring point reaches each predetermined position includes receiving signal intermittent data when the monitoring point reaches the predetermined position, the intermittent data including an intermittent start time, an intermittent end time, and an intermittent duration; obtaining the median of the intermittent start time and the intermittent end time as the time at which the monitoring point reaches the predetermined position; obtaining the width of the rotating body at the corresponding position of the monitoring point; and obtaining the speed of the monitoring point at the predetermined position based on the intermittent duration.

[0027] In this embodiment, multiple monitoring points are set on the rotary body of the switch for each phase, and multiple predetermined positions are set on the standard movement trajectory of each monitoring point. A trajectory collection module is placed at each predetermined position to obtain actual movement data when the monitoring point on the rotary body reaches the predetermined position. This makes the actual movement data more accurate, and also obtains several switching parameters during the opening and closing process of the rotary body from the actual movement data of the rotary body for each phase, making it easy to determine whether the switch has been fully opened or closed based on the several switching parameters. This solves the technical problem of the inconvenience of monitoring the opening and closing status and synchronization of a three-phase switch in the prior art.

[0028] According to another embodiment of the present invention, determining whether the switch is fully opened includes satisfying a first opening condition when the speeds of the starting movements of the rotating bodies of each phase are all greater than a first set starting speed; satisfying a second opening condition when the speed difference between the intermediate movements of the rotating bodies of any two phases is all smaller than the first set speed difference; satisfying a third opening condition when the speeds of the ending movements of the rotating bodies of each phase are all smaller than the first set ending speed; satisfying a fourth opening condition when the difference between the operation times of the rotating bodies of any two phases is all smaller than the first set time; satisfying a fifth opening condition when the difference between the start times of the operation of the rotating bodies of any two phases is all smaller than the second set time; and determining that the switch is fully opened when all of the first opening condition, the second opening condition, the third opening condition, the fourth opening condition, and the fifth opening condition are satisfied.

[0029] Here, determining whether the switch is completely closed includes satisfying the first closing condition when the speeds of the starting movements of the rotating bodies of each phase are all greater than a second set starting speed, satisfying the second closing condition when the difference in the speeds of the intermediate movements of the rotating bodies of any two phases is less than the difference in the second set speeds, satisfying the third closing condition when the speeds of the ending movements of the rotating bodies of each phase are all greater than the second set ending speed, satisfying the fourth closing condition when the difference in the operation times of the rotating bodies of any two phases is less than the third set time, satisfying the fifth closing condition when the difference in the end times of the operation of the rotating bodies of any two phases is less than the fourth set time, and determining that the switch is completely closed when all of the first closing condition, second closing condition, third closing condition, fourth closing condition, and fifth closing condition are satisfied.

[0030] The specific implementation process of this embodiment includes the following:

[0031] In this embodiment, during the opening process, attention must be paid to the synchronism of the opening, i.e., the start time of operation, the start speed of opening, and the operating time of the entire process, and the corresponding conditions must be met. Therefore, the requirements for the first, fourth, and fifth opening conditions are relatively high, while the requirements for the second and third opening conditions are relatively low. When some switching parameters generated during the opening process of a three-phase switch satisfy the first, second, third, fourth, and fifth opening conditions, the switch is determined to be completely opened.

[0032] In this embodiment, since it is necessary to pay attention to the end time, end speed and operation time of the operation during the closing process, the requirements for the third, fourth and fifth closing conditions are relatively high, while the requirements for the first and second closing conditions may be set relatively low, and if all of the first, second, third, fourth and fifth closing conditions are met, it is determined that the switch is completely closed.

[0033] In another embodiment of the present invention, the trajectory collection module includes a group of several infrared transceivers and a processor, and the several groups of infrared transceivers are installed in one-to-one correspondence with several predetermined positions on the standard movement trajectory of the corresponding monitoring point, and each infrared transceiver group includes an infrared receiver and an infrared transmitter, and the infrared receivers and infrared transmitters are arranged in one-to-one correspondence on both sides of the rotating body, and the processor responds to an opening / closing command by controlling the multiple infrared transmitters to transmit infrared rays to the corresponding infrared receivers, and the received signals are sent from the infrared receiver to the processor, and the processor receives intermittent data of each received signal to obtain the time and speed at which the monitoring point reaches each predetermined position.

[0034] The specific implementation process of this embodiment includes the following:

[0035] An infrared transmitter-receiver is installed at a predetermined position on the movement trajectory of the monitoring point, and an infrared receiver and an infrared transmitter are arranged in one-to-one correspondence on both sides of the rotating body. When the rotating body is between the infrared receiver and the infrared transmitter, the infrared signal transmitted from the infrared transmitter is blocked, the infrared receiver cannot receive the infrared signal, the received signal is turned off, and the intermittent start time of the received signal is recorded. When the rotating body passes through the infrared receiver and infrared transmitter, the infrared receiver receives the infrared signal again, the received signal is restored, and the intermittent end time of the received signal is recorded. The infrared receiver and infrared transmitter work together to collect intermittent data when the monitoring point on the rotating body reaches the predetermined position, thereby obtaining actual movement data when the predetermined position is reached.

[0036] It should be noted that the above examples are merely used to explain the technical solution of the present invention and are not limiting. The present invention has been described in detail with reference to preferred embodiments. However, as can be understood by those skilled in the art, the technical solution of the present invention can be modified or substituted with equivalents without departing from the spirit and scope of the technical solution of the present invention, and all such modifications or equivalent substitutions shall be included in the scope of the claims of the present invention.

[0037] (Addendum) (Appendix 1) selecting several monitoring points on the rotary body of the switch, the several monitoring points being spaced apart along the extending direction of the rotary body; Obtaining a standard movement trajectory during the switching process of the switch at each monitoring point, and installing a trajectory collection module based on the standard movement trajectory of each monitoring point to obtain actual movement data of the monitoring point during the switching process; Responding to a switch opening / closing command, a plurality of trajectory collection modules acquire actual movement data of a plurality of monitoring points in a one-to-one correspondence, the actual movement data including the time and speed at which the monitoring points reach several predetermined positions on the standard movement trajectory, the several predetermined positions including a start position and an end position; Obtaining several opening and closing parameters during the opening and closing process of the rotating body based on actual movement data of multiple monitoring points on the rotating body of the same phase; and determining whether the switch is fully opened or closed based on several opening and closing parameters of the rotating bodies of all phases.

[0038] (Appendix 2) Obtaining some opening and closing parameters in the opening and closing process of the rotating body is Obtaining a time from the start of motion to the end of motion of each monitoring point based on the time when each monitoring point reaches some predetermined position on the corresponding standard movement trajectory; Obtaining an average value of the time from the start of operation to the end of operation of all monitoring points as the operation time of the rotating body; Obtaining a start speed, an end speed, and an intermediate speed of each monitoring point based on a speed at which each monitoring point reaches a number of predetermined positions on the standard movement trajectory; 2. A method for monitoring the opening and closing state of a switch according to claim 1, comprising: obtaining an average value of the start speeds of all monitoring points as the speed of the starting movement of the rotating body; obtaining an average value of the intermediate speeds of all monitoring points as the speed of the intermediate movement of the rotating body; and obtaining an average value of the end speeds of all monitoring points as the speed of the ending movement of the rotating body.

[0039] (Appendix 3) Determining whether the switch is fully opened or not is When the speeds of the starting operations of the rotating bodies of the respective phases are all greater than a first set starting speed, a first opening condition is satisfied; When the speed difference between the intermediate movements of the rotating bodies of any two phases is smaller than the first set speed difference, the second opening condition is satisfied; When the speeds of the end operations of the rotating bodies of the respective phases are all lower than the first set end speed, a third opening condition is satisfied; When the difference between the operation times of the rotating bodies of any two phases is smaller than the first set time, a fourth opening condition is satisfied; When the difference between the operation start times of the rotating bodies of any two phases is smaller than the second set time, a fifth opening condition is satisfied; determining that the switch is fully open when the first open condition, the second open condition, the third open condition, the fourth open condition, and the fifth open condition are all satisfied.

[0040] (Appendix 4) Determining whether the switch is fully closed or not is When the speed of the start operation of the rotating body of each phase is all greater than the second set start speed, the first closing condition is satisfied; When the speed difference between the intermediate movements of the rotating bodies of any two phases is smaller than the second set speed difference, the second closing condition is satisfied; When the speed of the end operation of the rotating body of each phase is all greater than the second set end speed, a third closing condition is satisfied; When the difference between the operation times of the rotating bodies of any two phases is smaller than the third set time, the fourth closing condition is satisfied; If the difference between the operation end times of the rotating bodies of any two phases is smaller than the fourth set time, a fifth closing condition is satisfied; and determining that the switch is completely closed when all of the first, second, third, fourth, and fifth closing conditions are satisfied.

[0041] (Appendix 5) A method for monitoring the opening and closing state of a switch described in Appendix 2, characterized in that the intermediate speed includes an average value of the speeds at several predetermined positions other than the start and end positions of the monitoring point on its standard movement trajectory.

[0042] (Appendix 6) The trajectory collection module includes a group of several infrared transceivers and processors, and the several infrared transceiver groups are installed in one-to-one correspondence with several predetermined positions on the standard movement trajectory of the corresponding monitoring point; Each infrared transmitting / receiving device group includes an infrared receiver and an infrared transmitter, and the infrared receivers and infrared transmitters are arranged in a one-to-one correspondence on both sides of the rotating body, A method for monitoring the opening and closing status of a switch as described in Appendix 1, characterized in that the processor responds to an opening and closing command by controlling multiple infrared transmitters to transmit infrared rays to corresponding infrared receivers, and the infrared receiver transmits received signals to the processor, and the processor receives intermittent data of each received signal to obtain the time and speed at which the monitoring point reaches each predetermined position.

[0043] (Appendix 7) Obtaining the time and speed at which the monitoring point reaches each predetermined position includes: receiving signal intermittence data when the monitoring point reaches a predetermined position, the intermittence data including an intermittence start time, an intermittence end time, and an intermittence duration; acquiring a median value between an intermittent start time and an intermittent end time as the time when the monitoring point reaches the predetermined position; acquiring a width of the rotating body at a corresponding position of a monitoring point, and acquiring a speed of the monitoring point at the predetermined position based on the intermittent time.

[0044] (Appendix 8) A method for monitoring the open / closed state of a switch according to claim 1, characterized in that at least four predetermined positions are set on each standard movement trajectory.

[0045] (Appendix 9) A method for monitoring the open / closed state of a switch according to claim 1, characterized in that at least two monitoring points are installed on the same rotating body.

[0046] (Appendix 10) 10. A method for monitoring the switching state of a switch according to claim 9, wherein a monitoring point is installed at a location close to the movable contact on the rotating body.

Claims

1. selecting several monitoring points on the rotary body of the switch, the several monitoring points being spaced apart along the extending direction of the rotary body; Obtaining a standard movement trajectory of each monitoring point during the switching process of the switch, and installing a trajectory collection module based on the standard movement trajectory of each monitoring point to obtain actual movement data of the monitoring point during the switching process; Responding to a switch opening / closing command, a plurality of trajectory collection modules acquire actual movement data of a plurality of monitoring points in a one-to-one correspondence, the actual movement data including the time and speed at which the monitoring points reach several predetermined positions on the standard movement trajectory, the several predetermined positions including a start position and an end position; Obtaining several opening and closing parameters during the opening and closing process of the rotating body based on actual movement data of multiple monitoring points on the rotating body of the same phase; and determining whether the switch is fully opened or closed based on several opening and closing parameters of the rotating bodies of all phases.

2. Obtaining some opening and closing parameters in the opening and closing process of the rotating body is Obtaining a time from the start of motion to the end of motion of each monitoring point based on the time when each monitoring point reaches some predetermined position on the corresponding standard movement trajectory; Obtaining an average value of the time from the start of operation to the end of operation of all monitoring points as the operation time of the rotating body; Obtaining a start speed, an end speed, and an intermediate speed of each monitoring point based on a speed at which each monitoring point reaches a number of predetermined positions on the standard movement trajectory; 2. The method for monitoring the opening and closing state of a switch according to claim 1, further comprising: obtaining an average value of the start speeds of all monitoring points as the speed of the starting movement of the rotating body; obtaining an average value of the intermediate speeds of all monitoring points as the speed of the intermediate movement of the rotating body; and obtaining an average value of the end speeds of all monitoring points as the speed of the ending movement of the rotating body.

3. Determining whether the switch is fully opened or not is When the speeds of the starting operations of the rotating bodies of the respective phases are all greater than a first set starting speed, a first opening condition is satisfied; When the speed difference between the intermediate movements of the rotating bodies of any two phases is smaller than the first set speed difference, the second opening condition is satisfied; When the speeds of the end operations of the rotating bodies of the respective phases are all lower than the first set end speed, a third opening condition is satisfied; When the difference between the operation times of the rotating bodies of any two phases is smaller than the first set time, a fourth opening condition is satisfied; When the difference between the operation start times of the rotating bodies of any two phases is smaller than the second set time, a fifth opening condition is satisfied; 3. The method for monitoring the opening and closing state of a switch according to claim 2, further comprising determining that the switch is completely open when the first opening condition, the second opening condition, the third opening condition, the fourth opening condition, and the fifth opening condition are all satisfied.

4. Determining whether the switch is fully closed or not is When the speeds of the start operations of the rotating bodies of the respective phases are all greater than a second set start speed, a first closing condition is satisfied; When the speed difference between the intermediate movements of the rotating bodies of any two phases is smaller than the second set speed difference, the second closing condition is satisfied; When the speeds of the end operations of the rotating bodies of the respective phases are all greater than the second set end speed, a third closing condition is satisfied; When the difference between the operation times of the rotating bodies of any two phases is smaller than the third set time, a fourth closing condition is satisfied; If the difference between the operation end times of the rotating bodies of any two phases is smaller than the fourth set time, a fifth closing condition is satisfied; 3. The method for monitoring the opening and closing state of a switch according to claim 2, further comprising determining that the switch is completely closed when all of the first closing condition, the second closing condition, the third closing condition, the fourth closing condition, and the fifth closing condition are satisfied.

5. 3. The method for monitoring the switching state of a switch according to claim 2, wherein the intermediate speed includes an average value of speeds at several predetermined positions other than the start position and end position of the monitoring point on the standard movement trajectory.

6. The trajectory collection module includes a group of several infrared transceivers and processors, and the several infrared transceiver groups are installed in one-to-one correspondence with several predetermined positions on the standard movement trajectory of the corresponding monitoring point; Each infrared transmitting / receiving device group includes an infrared receiver and an infrared transmitter, and the infrared receivers and infrared transmitters are arranged in a one-to-one correspondence on both sides of the rotating body, 2. The method for monitoring the switching state of a switch according to claim 1, wherein the processor responds to a switching command by controlling the plurality of infrared transmitters to transmit infrared rays to corresponding infrared receivers, the infrared receivers transmit received signals to the processor, and the processor receives intermittent data of each received signal to obtain the time and speed at which the monitoring point reaches each predetermined position.

7. Obtaining the time and speed at which the monitoring point reaches each predetermined position includes: receiving signal intermittence data when the monitoring point reaches a predetermined position, the intermittence data including an intermittence start time, an intermittence end time, and an intermittence duration; acquiring a median value between an intermittent start time and an intermittent end time as the time when the monitoring point reaches the predetermined position; 7. The method for monitoring the switching state of a switch according to claim 6, further comprising obtaining a width of the rotating body at a corresponding position of a monitoring point, and obtaining a speed of the monitoring point at the predetermined position based on the intermittent time.

8. 2. The method for monitoring the switching state of a switch according to claim 1, wherein at least four predetermined positions are set on each standard movement trajectory.

9. 2. The method for monitoring the switching state of a switch according to claim 1, wherein at least two monitoring points are provided on the same rotating body.

10. 10. The method for monitoring the switching state of a switch according to claim 9, wherein the monitoring point is installed at a location on the rotating body close to the movable contact.

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