Control method and system of permanent magnet on-load voltage regulation tap switch

Abstract

The invention relates to the technical field of power grid and transformer manufacturing, in particular to a control method and system for a permanent magnet on-load voltage regulation tap switch, and the method comprises the steps: collecting a permanent magnet switch gear signal through a switch gear signal collection module; voltage information of the low-voltage side of the transformer is acquired through a voltage signal acquisition module; logic judgment is carried out on the collected gear signals and the low-voltage side voltage signals, and permanent magnet mechanism driving current is output through a central controller; a selection driving mechanism in a tap switch is driven by a permanent magnetic mechanism to complete connection switching of transformer tapping taps; and the central controller performs double-closed-loop judgment on the gear signal and the voltage signal on the low-voltage side of the transformer, and gives a corresponding instruction according to a judgment result. The method has the beneficial effects that the state of the permanent magnet on-load tap-changer is monitored in real time through the double feedback loops, the control precision is improved, and faults are reduced; the central controller dynamically adjusts the driving current, ensures the consistency of the switching speed, adapts to different environments, and prolongs the service life.

Description

Technical Field

[0001] The invention relates to the technical field of power grid and transformer manufacturing, and in particular to a control method and system for a permanent magnet on-load voltage regulating tap changer. Background Art

[0002] In the field of permanent magnet on-load voltage-regulating switch products, it is currently impossible to effectively monitor the steady-state position and operating status of the permanent magnet mechanism, which poses a safety risk during the switching process. In addition, the position determination of some permanent magnet on-load tap changers depends on the number of times the voltage rises and falls on the low-voltage side, which can easily lead to incorrect position indications and misjudgment by operation and maintenance personnel. During the installation and maintenance of the tap changer, these problems require the switch to be strictly aligned with the central controller, increasing the difficulty of installation and maintenance and the probability of switch failure. In addition, failures caused by the above problems are usually difficult to accurately determine and eliminate.

[0003] The existing permanent magnet mechanism driven tap changer has a fixed driving current in the control circuit. For the permanent magnet mechanism, the magnitude of the driving current directly determines whether the drive is successful and the driving speed. However, due to changes in the external environment and the difference in resistance of the permanent magnet mechanism in forward and reverse motion, it is difficult to ensure that the switching speed of the permanent magnet mechanism remains consistent in different environments with a constant current. For tap changers, especially vacuum on-load tap changers, the stability of the switching time of the permanent magnet mechanism directly affects the action sequence of the tap changer contacts and resistors.

[0004] In the existing fault handling of permanent magnet on-load tap changers, since the operating status of the tap changer cannot be effectively monitored, there is often a lack of timely response measures for faults that occur during operation. Some minor faults can only be discovered and handled after the switch is damaged. For some simple faults, they can only be repaired by power outages and replacing switches, and in some cases the switch must be returned to the factory for repair, which requires power supply companies to maintain sufficient spare parts inventory to deal with possible emergencies. Summary of the invention

[0005] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0006] Therefore, an object of the present invention is to provide a control method for a permanent magnet on-load voltage regulating tap changer, which can improve the monitoring and control accuracy of the tap changer, reduce the occurrence of accidents, and provide convenience for prediction and maintenance.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a control method of a permanent magnet on-load voltage regulating tap changer, comprising collecting a permanent magnet switch gear signal through a switch gear signal collection module;

[0008] The voltage information on the low-voltage side of the transformer is collected through the voltage signal collection module;

[0009] Perform logical judgment on the acquired gear position signal and low-voltage side voltage signal, and output the permanent magnet mechanism driving current through the central controller;

[0010] The selection drive mechanism in the tap changer is driven by the permanent magnet mechanism to complete the connection switching of the transformer tap;

[0011] The central controller performs double closed-loop judgment on the gear position signal and the voltage signal on the low-voltage side of the transformer, and gives corresponding instructions based on the judgment results.

[0012] As a preferred solution of the control method of the permanent magnet on-load voltage regulating tap changer of the present invention, the permanent magnet gear position signal acquisition includes real-time or intermittent signal acquisition through a switch gear position signal acquisition module.

[0013] As a preferred solution of the control method of the permanent magnet on-load tap changer of the present invention, the central controller outputs the permanent magnet mechanism driving current, including: the central controller calculates the permanent magnet mechanism driving current according to the switching time of the permanent magnet mechanism previously adjusted, using the gear signal and the low-voltage side voltage signal of the transformer, and controls the action of the permanent magnet mechanism under the limitation of the driving current threshold.

[0014] As a preferred solution of the control method of the permanent magnet on-load voltage regulating tap changer of the present invention, the double closed-loop judgment includes comparing and detecting the signals of the two closed-loop circuits according to the driving logic to judge whether the gear shifting is normal or abnormal.

[0015] As a preferred solution of the control method of the permanent magnet on-load voltage regulating tap changer of the present invention, the gear shifting status includes a normal gear shifting prompt, a locking alarm, and a locking alarm after giving a current driven to other gears.

[0016] In order to solve the above technical problems, the present invention also provides the following technical solutions: a control system of a permanent magnet on-load voltage-regulating tap changer, comprising a switch gear signal acquisition module, a voltage signal acquisition module arranged inside the transformer, a tap selection drive module arranged inside the tap changer, and a control module connected to both the switch gear signal acquisition module and the voltage signal acquisition module.

[0017] As a preferred solution of the control system of the permanent magnet on-load voltage-regulating tap changer of the present invention, wherein: the switch gear signal acquisition module includes a switch gear signal collector; the voltage signal acquisition module includes a voltage signal collector; the control module includes a central controller; the tap selection drive module includes a static contact group, a moving contact push rod connected to the static contact group, a moving contact group fixedly connected to the moving contact push rod, a permanent magnet connected to the moving contact push rod, and a micro switch connected to the permanent magnet.

[0018] As a preferred solution of the control system of the permanent magnet on-load voltage regulating tap changer of the present invention, the switch gear signal acquisition module is integrated on the permanent magnet mechanism or installed inside the tap changer to perform real-time or intermittent signal acquisition to obtain the gear state of the switch.

[0019] As a preferred solution of the control system of the permanent magnet on-load tap changer of the present invention, the voltage signal acquisition module is directly connected to the low-voltage side of the transformer, and transmits the acquired voltage signal to the control module through the signal line.

[0020] As a preferred solution of the control system of the permanent magnet on-load voltage-regulating tap changer of the present invention, the switch gear signal acquisition module and the voltage signal acquisition module are both connected to the control module through signal lines, and the acquired signals are transmitted to the central controller.

[0021] The beneficial effects of the present invention are as follows: the present invention monitors the state of the permanent magnet on-load tap changer in real time through a dual feedback loop, thereby improving control accuracy and reducing faults; the central controller dynamically adjusts the drive current to ensure switching speed consistency, adapt to different environments, and extend service life. In addition, a drive current threshold is set to predict faults, and a dual closed-loop feedback loop determines and repairs abnormal conditions to reduce the impact of accidents. Multiple fault signal outputs simplify maintenance, reduce costs and maintenance requirements, and integrate the switch gear signal acquisition module into the permanent magnet mechanism to improve signal acquisition accuracy, optimize volume design, and facilitate installation and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0023] Figure 1 The figure is a flow chart of the control method of the permanent magnet on-load voltage regulating tap changer.

[0024] Figure 2 The invention is a schematic diagram of a double closed-loop permanent magnet on-load tap changer control method for a permanent magnet on-load voltage regulating tap changer.

[0025] Figure 3 The present invention is a logic diagram of a control method of a permanent magnet on-load voltage regulating tap changer.

[0026] Figure 4 The present invention is the first implementation method of the control system of the permanent magnet on-load voltage regulating tap changer.

[0027] Figure 5 The present invention is a second implementation of the control system of the permanent magnet on-load voltage regulating tap changer.

[0028] Figure 6 The present invention is a schematic diagram of a switch position signal acquisition device and a tap selection drive device of a control system of a permanent magnet on-load voltage regulating tap changer. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] Example 1

[0033] Reference Figure 1 to Figure 3 , is an embodiment of the present invention, which provides a control method for a permanent magnet on-load voltage regulating tap changer, which can improve the monitoring and control accuracy of the tap changer, reduce accidents, and provide convenience for prediction and maintenance.

[0034] Specifically, the permanent magnet switch position signal is collected through the switch position signal collection module;

[0035] The voltage information on the low-voltage side of the transformer is collected through the voltage signal collection module;

[0036] Perform logical judgment on the acquired gear position signal and low-voltage side voltage signal, and output the permanent magnet mechanism driving current through the central controller;

[0037] The selection drive mechanism in the tap changer is driven by the permanent magnet mechanism to complete the connection switching of the transformer tap;

[0038] The central controller performs double closed-loop judgment on the gear position signal and the voltage signal on the low-voltage side of the transformer, and gives corresponding instructions based on the judgment results.

[0039] Specifically, Figure 3As shown in the figure, when the voltage on the low-voltage side of the transformer exceeds the automatic gear adjustment threshold or receives an external gear adjustment command, the voltage signal acquisition module transmits the collected signal to the central controller. When the central controller receives the gear adjustment command, the central controller judges the three-phase voltage of the transformer. If the voltage does not meet the voltage adjustment threshold condition, the system stops operating; if the voltage meets the voltage adjustment threshold, the gear signal is checked for correctness. When the gear signal is consistent with the gear signal recorded inside the central controller, the central controller controls the drive current output according to the permanent magnet mechanism drive current set in the last gear adjustment. If the gear signal is abnormal, the corresponding fault warning code is output, and the central controller will be locked and an alarm will be issued.

[0040] The selection drive mechanism in the tap changer is driven by the permanent magnet mechanism to complete the connection switching of the transformer tap. When the permanent magnet mechanism drive delay ends, the voltage signal on the low-voltage side of the transformer is checked. If the voltage after the gear adjustment reaches the expected value, the gear feedback signal is checked to confirm whether the switch signal is normal. If normal, the central controller will calculate the switching time of the permanent magnet mechanism according to the change time of the gear feedback signal and evaluate it; if the gear signal is abnormal, the corresponding fault warning code is output, the central controller is locked and an alarm is sounded.

[0041] When judging the switching time of the permanent magnet mechanism, the central controller makes a judgment based on the optimal switching time and tolerance. If the switching time is appropriate, the central controller records the current drive current; if the switching time is too long, the central controller calculates the next increased drive current according to the proportional logic and makes a current threshold judgment. If the current is appropriate, the next drive current is set; if it is not appropriate, the corresponding fault warning code is output, the central controller is locked and an alarm is sounded. If the switching time is too short, the next reduced drive current is calculated according to the proportional logic, and the current threshold judgment is also made; if the current is not appropriate, the corresponding warning code is output and the central controller is locked.

[0042] If the voltage after the gear adjustment fails to reach the expected value after the permanent magnet mechanism drive delay ends, the central controller determines whether the voltage on the low-voltage side of the transformer has changed significantly. If there is a change, it means that there may be a current-carrying fault in the target gear, or the resistor in the tap switch remains working. At this time, the central controller will output the upper limit of the current threshold, drive the permanent magnet mechanism back to the original gear, try to repair the fault, and output the corresponding fault warning code, lock the central controller and alarm.

[0043] If the voltage after the adjustment does not reach the expected level and the voltage on the low voltage side does not change significantly, the central controller will determine whether the gear signal of the permanent magnet mechanism is still in the original gear. If so, the permanent magnet mechanism may remain in the original gear due to insufficient current or insufficient action distance, or be sucked back by the static attraction force of the original gear.

[0044] At this point, the central controller will output a larger drive current again until the current increases to the upper threshold. Prior to this, the central controller will simulate the first drive to determine whether the voltage on the low-voltage side of the transformer has successfully switched to the target voltage. If the current increases to the upper threshold and the problem is still not solved, the corresponding fault warning code will be output and the central controller will be locked to issue an alarm.

[0045] In summary, the present invention monitors the state of the permanent magnet on-load tap changer in real time through a dual feedback loop, thereby improving control accuracy and reducing faults; the central controller dynamically adjusts the drive current to ensure switching speed consistency, adapt to different environments, and extend service life. In addition, a drive current threshold is set to predict faults, and a dual closed-loop feedback loop determines and repairs abnormal conditions to reduce the impact of accidents. Multiple fault signal outputs simplify maintenance, reduce costs and maintenance requirements, and integrate the switch gear signal acquisition module into the permanent magnet mechanism to improve signal acquisition accuracy, optimize volume design, and facilitate installation and replacement.

[0046] Example 2

[0047] Reference Figure 1 to Figure 3 , which is the second embodiment of the present invention, provides a control method for a permanent magnet on-load voltage regulating tap changer, which can improve the monitoring and control accuracy of the tap changer, reduce accidents, and provide convenience for prediction and maintenance.

[0048] Specifically, the permanent magnet switch position signal is collected through the switch position signal collection module;

[0049] The voltage signal acquisition module is used to collect the voltage information on the low-voltage side of the transformer;

[0050] Perform logical judgment on the acquired gear position signal and low-voltage side voltage signal, and output the permanent magnet mechanism driving current through the central controller;

[0051] The selection drive mechanism in the tap changer is driven by the permanent magnet mechanism to complete the connection switching of the transformer tap;

[0052] The central controller performs double closed-loop judgment on the gear position signal and the voltage signal on the low-voltage side of the transformer, and gives corresponding instructions based on the judgment results.

[0053] It should be noted that the corresponding instructions include normal gear shifting prompts, fault codes and new gear shifting instructions.

[0054] Furthermore, permanent magnet gear position signal acquisition includes real-time or intermittent signal acquisition through a switch gear position signal acquisition module.

[0055] It should be noted that the switch position signal acquisition module may include one or more sensors installed near the mechanical structure of the tap changer, which can sense the change of the gear position in real time. These sensors will send signals to the central controller in real time or according to a set time interval. For example, when the switch moves from one gear to another, the sensor will detect the change of the mechanical structure and send a signal to the controller indicating that the gear position has changed.

[0056] Furthermore, the central controller outputs the permanent magnet mechanism driving current, including: the central controller calculates the permanent magnet mechanism driving current according to the permanent magnet mechanism switching time of the previous gear adjustment, using the gear signal and the low-voltage side voltage signal of the transformer, and controls the action of the permanent magnet mechanism under the limitation of the driving current threshold.

[0057] It should be noted that the central controller will decide how much drive current to output to the permanent magnet mechanism based on historical data and real-time data. For example, if historical data shows that the permanent magnet mechanism completed the gear switch within 0.5 seconds during the last gear adjustment, and the current gear signal and the transformer low-voltage side voltage signal indicate that a faster switch is required, the central controller will calculate the need to increase the drive current to shorten the switching time. At the same time, the central controller will consider the drive current threshold, such as the maximum current limit, to ensure that no damage is caused to the permanent magnet mechanism. If the calculated drive current exceeds this threshold, the central controller will adjust it to the maximum allowable value and issue a warning to prompt maintenance personnel to check whether there is a problem with the system.

[0058] Furthermore, the dual closed-loop judgment includes comparing and detecting the signals of the two closed-loop circuits according to the driving logic to judge whether the gear shifting is normal or abnormal.

[0059] Furthermore, the gear shifting status includes a normal gear shifting prompt, a lock alarm, and a lock alarm after giving a current to drive to other gears.

[0060] In summary, the present invention monitors the state of the permanent magnet on-load tap changer in real time through a dual feedback loop, thereby improving control accuracy and reducing faults; the central controller dynamically adjusts the drive current to ensure switching speed consistency, adapt to different environments, and extend service life. In addition, a drive current threshold is set to predict faults, and a dual closed-loop feedback loop determines and repairs abnormal conditions to reduce the impact of accidents. Multiple fault signal outputs simplify maintenance, reduce costs and maintenance requirements, and integrate the switch gear signal acquisition module into the permanent magnet mechanism to improve signal acquisition accuracy, optimize volume design, and facilitate installation and replacement.

[0061] Example 3

[0062] Reference Figure 3 to Figure 5, which is the third embodiment of the present invention, provides a control system for a permanent magnet on-load voltage-regulating tap changer, which can improve the monitoring and control accuracy of the tap changer, reduce accidents, and provide convenience for prediction and maintenance.

[0063] Specifically, a switch gear signal acquisition module 100, a voltage signal acquisition module 200 arranged inside the transformer, a tap selection drive module 300 arranged inside the tap changer, and a control module 400 connected to both the switch gear signal acquisition module 100 and the voltage signal acquisition module 200.

[0064] Furthermore, the switch gear signal acquisition module 100 includes a switch gear signal collector 101; the voltage signal acquisition module 200 includes a voltage signal collector 201; the control module 400 includes a central controller 301; the tap selection drive module 300 includes a static contact group 401, a moving contact push rod 402 connected to the static contact group 401, a moving contact group 403 fixedly connected to the moving contact push rod 402, a permanent magnet 404 connected to the moving contact push rod 402, and a micro switch 405 connected to the permanent magnet 404.

[0065] Furthermore, the switch position signal acquisition module 100 is integrated on the permanent magnet mechanism or installed inside the tap switch to perform real-time or intermittent signal acquisition to obtain the switch position status.

[0066] It should be noted that the switch position signal acquisition module 100 includes a sensor, a circuit board, a connecting line, etc., and is used to collect the switch position signal in real time or intermittently.

[0067] Furthermore, the voltage signal acquisition module 200 is directly connected to the low-voltage side of the transformer, and transmits the acquired voltage signal to the control module 400 through a signal line.

[0068] It should be noted that the voltage signal acquisition module 200 includes a voltage sensor, a signal conditioning circuit, an analog-to-digital converter (ADC), connecting wires, etc., and is used to collect voltage information on the low-voltage side of the transformer.

[0069] Furthermore, the switch position signal acquisition module 100 and the voltage signal acquisition module 200 are both connected to the control module 400 via signal lines, and transmit the acquired signals to the central controller 301 .

[0070] like Figure 6As shown, both the static contact group 401 and the moving contact group 403 are made of copper materials and processed and formed according to the structural requirements, and are connected to the transformer tapping lead through the switch terminal; the moving contact push rod 402 is preferably made of fiber-reinforced composite materials such as DMC, PPA, and glass fiber pull rod, and the moving contact group 403 is fixed on the push rod, and the static contact group 401 is selected by moving the push rod. The permanent magnet 404 is selected with different specifications and performance parameters according to the moving contact stroke and switching speed. The permanent magnet 404 is connected to the moving contact push rod 402 to push the moving contact group 403 to connect with different static contact groups 401. The micro switch 405 selects a suitable model according to the structural requirements, and the opening and closing of the micro switches 405 at both ends are triggered by the position switching of the permanent magnet 404. The signal acquisition module of the micro switch 405 transmits the opening and closing signal to the controller.

[0071] In summary, the present invention monitors the state of the permanent magnet on-load tap changer in real time through a dual feedback loop, improves control accuracy, and reduces faults; the central controller 301 dynamically adjusts the drive current to ensure switching speed consistency, adapt to different environments, and extend service life. In addition, a drive current threshold is set to predict faults, and a dual closed-loop feedback loop determines and repairs abnormal conditions to reduce the impact of accidents. Multiple fault signal outputs simplify maintenance, reduce costs and maintenance requirements, and integrate the switch gear signal acquisition module 100 into the permanent magnet mechanism to improve signal acquisition accuracy, optimize volume design, and facilitate installation and replacement.

[0072] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible without substantially departing from the novel teachings and advantages of the subject matter described in the application (e.g., mounting arrangements, use of materials, color, changes in orientation, etc.). For example, the element shown as integrally formed may be composed of a plurality of parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete element may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to an alternative embodiment. In the claims, any "bracket plus function" clause is intended to cover the structure of the execution function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to a variety of modifications that still fall within the scope of the appended claims.

[0073] Additionally, in an effort to provide a concise description of example embodiments, all features of an actual implementation may not be described.

[0074] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0075] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A control method for a permanent magnet on-load voltage-regulating tap changer, characterized in that: include, The permanent magnet switch position signal is collected through the switch position signal collection module; The voltage signal acquisition module is used to collect the voltage information on the low-voltage side of the transformer; Perform logical judgment on the acquired gear position signal and low-voltage side voltage signal, and output the permanent magnet mechanism driving current through the central controller; The selection drive mechanism in the tap changer is driven by the permanent magnet mechanism to complete the connection switching of the transformer tap; The central controller performs double closed-loop judgment on the gear position signal and the voltage signal on the low-voltage side of the transformer, and gives corresponding instructions based on the judgment results.

2. The control method of the permanent magnet on-load voltage regulating tap changer according to claim 1, characterized in that: The permanent magnet gear position signal acquisition includes real-time or intermittent signal acquisition through a switch gear position signal acquisition module.

3. The control method of the permanent magnet on-load voltage regulating tap changer according to claim 2, characterized in that: The central controller outputs the permanent magnet mechanism driving current, including: the central controller calculates the permanent magnet mechanism driving current according to the permanent magnet mechanism switching time of the previous gear adjustment, using the gear signal and the low-voltage side voltage signal of the transformer, and controls the permanent magnet mechanism to operate under the limit of the driving current threshold.

4. The control method of the permanent magnet on-load voltage regulating tap changer according to claim 3, characterized in that: The dual closed-loop judgment includes comparing and detecting the signals of the two closed-loop circuits according to the driving logic to judge whether the gear shifting is normal or abnormal.

5. The control method of the permanent magnet on-load voltage regulating tap changer according to claim 4, characterized in that: The gear shifting status includes a normal gear shifting prompt, a locking alarm, and a locking alarm after giving a current to drive to other gears.

6. A control system for a permanent magnet on-load voltage-regulating tap changer, applicable to a control method for a permanent magnet on-load voltage-regulating tap changer, characterized in that: include, A switch position signal acquisition module (100), a voltage signal acquisition module (200) arranged inside a transformer, a tap selection drive module (300) arranged inside a tap switch, and a control module (400) connected to both the switch position signal acquisition module (100) and the voltage signal acquisition module (200).

7. The control system of the permanent magnet on-load voltage regulating tap changer according to claim 6, characterized in that: The switch gear signal acquisition module (100) comprises a switch gear signal collector (101); the voltage signal acquisition module (200) comprises a voltage signal collector (201); the control module (400) comprises a central controller (301); the tap selection drive module (300) comprises a stationary contact group (401), a moving contact push rod (402) connected to the stationary contact group (401), a moving contact group (403) fixedly connected to the moving contact push rod (402), a permanent magnet (404) connected to the moving contact push rod (402), and a micro switch (405) connected to the permanent magnet (404).

8. The control system of the permanent magnet on-load voltage regulating tap changer according to claim 7, characterized in that: The switch gear position signal acquisition module (100) is integrated on the permanent magnet mechanism or installed inside the tap switch to perform real-time or intermittent signal acquisition to obtain the gear position state of the switch.

9. The control system of the permanent magnet on-load voltage regulating tap changer according to claim 8, characterized in that: The voltage signal acquisition module (200) is directly connected to the low-voltage side of the transformer, and transmits the acquired voltage signal to the control module (400) via a signal line.

10. The control system of the permanent magnet on-load voltage regulating tap changer according to claim 9, characterized in that: The switch position signal acquisition module (100) and the voltage signal acquisition module (200) are both connected to the control module (400) via signal lines, and transmit the acquired signals to the central controller (301).

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