Excitation control device of excitation phase modifier

Abstract

The utility model relates to the technical field of excitation phase modifiers, and discloses an excitation control device of an excitation phase modifier, which comprises a phase modifier body, a mounting rack is mounted on the outer ring of the phase modifier body, a control box is fixed on the mounting rack, a circuit board is mounted in the control box, a groove is formed in the inner wall of the control box, and the circuit board is mounted in the groove. A groove is formed in the control box, a sliding seat is connected in the groove in a sliding mode, a mounting seat is fixed to the end side of the sliding seat, a magnet exciting coil is mounted on the mounting seat, a moving assembly and a switching assembly are mounted on the control box, the moving assembly comprises a lead screw rotationally connected into the control box, and the sliding seat and the lead screw are mounted in a threaded mode. According to the utility model, rapid switching of basic gears of the excitation circuit can be realized, the consumed time is short, the plurality of static contacts can adapt to various working conditions such as phase modifier starting, stable operation and full load, the current range does not need to be expanded by continuously adjusting the position of the excitation coil, and the situation that the coil moves to a limit position and cannot be adjusted is avoided.

Description

Technical Field

[0001] This utility model relates to the field of excitation phase-shifting technology, specifically to an excitation control device for an excitation phase-shifting camera. Background Technology

[0002] A synchronous condenser is a reactive power compensation device specifically designed for power systems. Essentially, it's a synchronous motor without mechanical load, solely supplying or absorbing reactive power from the grid. Through its built-in excitation system, it adjusts its own magnetic field strength to dynamically compensate for reactive power in the grid. Its core functions are stabilizing grid voltage, improving the grid power factor, suppressing voltage fluctuations and flicker, and ensuring the safe and stable operation of the grid under various load conditions. It is an indispensable key device in high-voltage transmission systems and new energy grid-connected systems.

[0003] Traditional devices often rely on manual plugging and unplugging of wiring or simple mechanical switches to switch the basic excitation circuit position. The switching process is time-consuming and inefficient. In addition, the number of positions is limited, and it can only adapt to 1-2 fixed working conditions. When the synchronous condenser switches from the start-up stage to the full-load operation stage, it cannot quickly switch to the corresponding position. It is necessary to continuously adjust the position of the excitation coil to expand the current range. This not only involves a long adjustment stroke and is time-consuming, but may also result in the coil moving to the limit position and being unable to continue adjustment, leading to insufficient device adaptability.

[0004] Therefore, we propose an excitation control device for a synchronous condenser to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this utility model is to provide an excitation control device for an excitation synchronous condenser, so as to solve the problems mentioned in the background art that existing control devices rely on manual plugging and unplugging of wiring or simple mechanical switches when switching the basic gear of the excitation circuit. The switching process is time-consuming, inefficient, and has a small number of gears, which can only adapt to a few fixed working conditions.

[0006] This utility model provides the following technical solution: an excitation control device for an excitation synchronous condenser, comprising a condenser body, a mounting frame mounted on the outer ring of the condenser body, a control box fixed on the mounting frame, a circuit board mounted inside the control box, a groove formed in the inner wall of the control box, a slide block slidably connected in the groove, a mounting base fixed to the end of the slide block, an excitation coil mounted on the mounting base, a moving component and a switching component mounted on the control box, the moving component comprising a lead screw rotatably connected inside the control box, and the slide block threadedly mounted to the lead screw.

[0007] Preferably, a mounting bracket is fixed to the side wall of the control box, a motor is fixed to the mounting bracket, a coupling is fixed to the output end of the motor, a drive shaft is fixed to the end of the coupling, and the lead screw is rotatably connected to the drive shaft.

[0008] Preferably, an electromagnet is fixed to the end of the transmission shaft, a cavity is formed inside the lead screw, the transmission shaft is rotatably connected to the cavity, a connecting plate is fixed to the inner wall of the cavity, a telescopic rod is fixed to the end of the connecting plate, and a permanent magnet is fixed to the end of the telescopic rod.

[0009] Preferably, a spring is sleeved on the outer ring of the telescopic rod, one end of the spring is fixedly connected to the connecting plate, and the other end of the spring is fixedly connected to the permanent magnet.

[0010] Preferably, the switching assembly includes a handle rotatably mounted on the outer ring of the drive shaft, an electromagnet II fixed inside the handle, a cavity II opened inside the drive shaft, a connecting plate II fixed to the inner wall of the cavity II, a telescopic rod II fixed to the end side of the connecting plate II, and a permanent magnet II fixed to the end side of the telescopic rod II.

[0011] Preferably, the outer ring of the telescopic rod two is fitted with a spring two, one end of the spring two is fixedly connected to the connecting plate two, and the other end of the spring two is fixedly connected to the permanent magnet two.

[0012] Preferably, a support frame is fixed on the handle, an electric actuator is fixed on the support frame, a moving contact is fixed at the output end of the electric actuator, and the moving contact is slidably connected to the handle.

[0013] Preferably, an arc-shaped insulating plate is fixed to the side wall of the control box, and a plurality of stationary contacts are installed on the arc-shaped insulating plate and electrically connected to the circuit board.

[0014] This utility model has the following beneficial effects:

[0015] 1. This device achieves rapid switching of the basic gear positions in the excitation circuit by setting a handle on the outer ring of the drive shaft, installing an electromagnet inside the handle, and installing a connecting plate, a telescopic rod, a permanent magnet, and a spring inside the cavity of the drive shaft. A support frame, an electric push column, and a moving contact are mounted on the handle. An arc-shaped insulating plate and multiple stationary contacts are installed on the side wall of the control box. When the electromagnet is energized, the handle forms a power connection with the drive shaft. The motor drives the handle to rotate and position the moving contact, and the electric push column pushes the moving contact to contact the stationary contact. The entire switching process takes significantly less time than traditional manual operation, significantly improving efficiency. Furthermore, the multiple stationary contacts can adapt to various operating conditions such as synchronous condenser startup, stable operation, and full load, eliminating the need to continuously adjust the excitation coil position to expand the current range and avoiding situations where the coil moves to its limit and cannot be adjusted. This improves the flexibility of gear switching, expands the applicability of the device, and completely solves the problem of insufficient adaptability of traditional devices.

[0016] 2. This device achieves flexible switching between the power connection between the drive shaft and the lead screw by installing an electromagnet on the end of the drive shaft and a connecting plate, a telescopic rod, a permanent magnet, and a spring inside the lead screw cavity. When not energized, the spring pushes the permanent magnet to separate from the electromagnet, preventing the motor from running idle due to accidental starting. When energized, the electromagnet attracts the permanent magnet, forming a rigid coupling, ensuring smooth power transmission without slippage or jamming, thus improving the controllability of power transmission. Simultaneously, in case of overload, the circuit board cuts off the power supply to the electromagnet, and the spring pulls the permanent magnet to reset and decouple, preventing component damage and achieving timely overload protection and reducing maintenance costs.

[0017] 3. This device can achieve precise adjustment of the excitation coil position, making the distance between the excitation coil and the rotor core of the synchronous condenser more precise. This, in turn, makes the magnetic field coupling intensity change more stable, thereby improving the excitation adjustment accuracy, reducing the excitation current fluctuation range, and ensuring the stable output of the synchronous condenser. This solves the problem of large excitation intensity fluctuation in traditional devices.

[0018] 4. This device controls the electric push column to drive the moving contact to first separate from the current stationary contact, then rotate and position it, and finally contact the target stationary contact. At the same time, the electric push column provides a stable thrust to ensure that the moving contact and the stationary contact are in close contact. After the gear switching is completed, the electromagnet is de-energized, which disconnects the handle from the transmission shaft, thus achieving safe and stable gear switching. This avoids short circuits at both contacts during switching and prevents subsequent deviations, thereby ensuring reliable contact, reducing excitation failures, and improving the safety of gear switching.

[0019] 5. The device achieves precise micro-adjustment within a small range by coordinating the control of the moving component and the switching component. The switching component presets a basic gear position to determine the approximate range of the excitation current, while the moving component adjusts the position of the excitation coil. This allows for rapid response to large changes in operating conditions while ensuring adjustment accuracy, making the excitation current control range more reasonable. It achieves a balance between adjustment efficiency and accuracy, meeting the fine control requirements of complex operating scenarios for synchronous condensers. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 .

[0021] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 .

[0022] Figure 3 This is a schematic diagram of the moving component and switching component of this utility model.

[0023] Figure 4 For the present utility model Figure 3 Cross-sectional structural diagram.

[0024] Figure 5 For the present utility model Figure 4 Enlarged structural diagram at point A in the middle.

[0025] Figure 6 For the present utility model Figure 4 Enlarged structural diagram at point B.

[0026] Figure 7 This is a schematic diagram of the switching component structure of this utility model.

[0027] In the diagram: 1. Phase converter body; 2. Mounting bracket; 3. Control box; 4. Circuit board; 5. Groove; 6. Slide; 7. Mounting base; 8. Excitation coil; 9. Moving assembly; 91. Fixed frame; 92. Motor; 93. Coupling; 94. Drive shaft; 941. Electromagnet I; 942. Cavity I; 943. Connecting plate I; 944. Telescopic rod I; 945. Permanent magnet I; 946. Spring I; 95. Lead screw; 10. Switching assembly; 101. Rotary handle; 102. Electromagnet II; 103. Cavity II; 104. Connecting plate II; 105. Telescopic rod II; 106. Spring II; 107. Permanent magnet II; 108. Support frame; 109. Electric push column; 110. Moving contact; 111. Arc-shaped insulating plate; 112. Stationary contact. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example 1:

[0030] This embodiment aims to address the problems of uncontrollable power transmission in traditional devices, which are prone to idling or jamming, resulting in large fluctuations in excitation intensity. Please refer to [link / reference needed]. Figure 1 - Figure 5An excitation control device for a synchronous condenser includes a condenser body 1, a mounting bracket 2 with an annular structure on the outer ring of the condenser body 1, and a control box 3. The control box 3 is fixed to the outer shell of the condenser body 1 by bolts and is used to support the weight of the control box 3, ensuring the relative position of the control box 3 and the condenser body 1 is stable and preventing the control box 3 from shifting due to vibration during operation. The control box 3 is fixed on the mounting bracket 2. A circuit board 4 is installed inside the control box 3. The circuit board 4 integrates the rectifier module, filter capacitor and signal acquisition chip required for excitation control, and is used to process the current signal of the excitation coil 8 and external control commands. A groove 5 is opened in the inner wall of the control box 3. A slide block 6 is slidably connected in the groove 5. A mounting seat 7 is fixed to the end of the slide block 6. The excitation coil 8 is installed on the mounting seat 7. A moving component 9 is installed on the control box 3. The moving component 9 includes a lead screw 95 rotatably connected in the control box 3. The slide block 6 and the lead screw 95 are threaded together.

[0031] A mounting bracket 91 is fixed to the side wall of the control box 3. A motor 92 is fixed to the mounting bracket 91. A coupling 93 is fixed to the output end of the motor 92. A transmission shaft 94 is fixed to the end of the coupling 93. A lead screw 95 is rotatably connected to the transmission shaft 94. An electromagnet 941 is fixed to the end of the transmission shaft 94. A cavity 942 is opened inside the lead screw 95. The transmission shaft 94 is rotatably connected to the cavity 942. A connecting plate 943 is fixed to the inner wall of the cavity 942. A telescopic rod 944 is fixed to the end of the connecting plate 943. A permanent magnet 945 is fixed to the end of the telescopic rod 944. A spring 946 is sleeved on the outer ring of the telescopic rod 944. One end of the spring 946 is fixedly connected to the connecting plate 943, and the other end of the spring 946 is fixedly connected to the permanent magnet 945.

[0032] In this embodiment: When the device is not started, it is in an initial standby state. At this time, electromagnet 941 is de-energized and does not generate magnetism. Under the natural elastic force of the outer spring 946 of telescopic rod 944, it is in a freely extended state. Permanent magnet 945 is pushed away from electromagnet 941, and the two are completely separated. At the same time, since no circuit gear switching is involved, electromagnet 102 is also de-energized. The transmission shaft 94 only maintains a rotational connection with the lead screw 95 and does not form a power coupling. The entire moving component 9 is in a ready-to-drive state.

[0033] When the excitation intensity needs to be adjusted according to the operating conditions of the synchronous condenser, the external control system generates an excitation adjustment command based on the load demand and transmits the command to the circuit board 4 inside the control box 3. After receiving the command, the circuit board 4 first energizes the electromagnet 941. The energized electromagnet 941 generates a strong magnetic attraction, overcoming the natural elasticity of the spring 946 and attracting the permanent magnet 945 inside the cavity 942 of the lead screw 95 towards itself. During this process, the permanent magnet 945 drives the telescopic rod 944 to extend axially, while the spring 946 is simultaneously stretched until the permanent magnet 945 and the electromagnet 941 are tightly fitted together. At this point, the drive shaft 94 and the lead screw 95 form a rigid power connection through the electromagnetic coupling of the electromagnet 941 and the permanent magnet 945. That is, when the drive shaft 94 rotates, it can directly drive the lead screw 95 to rotate synchronously, achieving power transmission braking.

[0034] After electromagnetic coupling is completed, the circuit board 4 outputs a start signal for the motor 92, and the motor 92, which is fixed on the side wall mounting bracket 91 of the control box 3, is powered on and starts to run. The output shaft of the motor 92 transmits torque to the transmission shaft 94 through the elastic pin coupling 93. Since the transmission shaft 94 has formed a power coupling with the lead screw 95, it synchronously drives the lead screw 95 to rotate inside the control box 3. Because the slide 6 is threadedly engaged with the lead screw 95 and the slide 6 is clearance-fitted with the groove 5 on the inner wall of the control box 3, the rotational motion of the lead screw 95 is converted into the linear motion of the slide 6 along the groove 5. The mounting seat 7 fixed to the end of the slide 6 moves synchronously with the slide 6, and the excitation coil 8 is fixed to the mounting seat 7 by bolts. Therefore, the excitation coil 8, the mounting seat 7, and the slide 6 move synchronously with the rotation direction of the lead screw 95 to move closer to or away from the synchronous condenser body 1.

[0035] The movement of the excitation coil 8 directly changes its relative position with the rotor core of the synchronous condenser, thus affecting the magnetic field coupling strength. When the motor 92 rotates forward, the lead screw 95 drives the slide 6 to move towards the synchronous condenser body 1, reducing the distance between the excitation coil 8 and the rotor core, significantly enhancing the magnetic field coupling strength, improving the efficiency of the synchronous condenser rotor in cutting magnetic field lines, increasing the output excitation current, and increasing the excitation intensity. When the motor 92 rotates in reverse, the slide 6 drives the excitation coil 8 to move away from the rotor core, widening the distance, weakening the magnetic field coupling strength, decreasing the output excitation current, and reducing the excitation intensity. The circuit board 4 collects the current signal of the excitation coil 8 in real time through the signal acquisition chip. When the current value reaches the target value set by the external control system, it immediately outputs a stop signal, the motor 92 stops running, and at the same time, the electromagnet 941 is de-energized, the spring 946 releases its elastic potential energy, pulling the permanent magnet 945 to reset and separate from the electromagnet 941. The drive shaft 94 is decoupled from the lead screw 95, and the excitation coil 8 remains in its current position, completing one excitation intensity adjustment.

[0036] Example 2:

[0037] This embodiment aims to address the problem that while fine-tuning of excitation intensity can be achieved by adjusting the position of excitation coil 8, it cannot quickly switch the basic excitation circuit setting according to different operating conditions of the excitation synchronous condenser, resulting in poor circuit adaptability and low adjustment efficiency under large changes in operating conditions. This embodiment is an improvement based on Embodiment 1. For details, please refer to... Figure 1 - Figure 4 , Figure 6 - Figure 7 The control box 3 is equipped with a switching assembly 10. The switching assembly 10 includes a handle 101 that is rotatably mounted on the outer ring of the transmission shaft 94. An electromagnet 102 is fixed inside the handle 101. A cavity 103 is opened inside the transmission shaft 94. A connecting plate 104 is fixed to the inner wall of the cavity 103. A telescopic rod 105 is fixed to the end side of the connecting plate 104. A permanent magnet 107 is fixed to the end side of the telescopic rod 105.

[0038] A spring 106 is sleeved on the outer ring of the telescopic rod 105. One end of the spring 106 is fixedly connected to the connecting plate 104, and the other end of the spring 106 is fixedly connected to the permanent magnet 107. A support frame 108 is fixed on the handle 101, and an electric push column 109 is fixed on the support frame 108. A moving contact 110 is fixed at the output end of the electric push column 109. The moving contact 110 is slidably connected to the handle 101. An arc-shaped insulating plate 111 is fixed on the side wall of the control box 3. A stationary contact 112 is installed on the arc-shaped insulating plate 111. There are multiple stationary contacts 112, and the stationary contacts 112 are electrically connected to the circuit board 4.

[0039] In this embodiment: when the device is not switching gears, it is in its initial state. Electromagnet 941 is de-energized and does not generate magnetism. It is in a freely extended state due to the natural elastic force of the outer spring 946 of the telescopic rod 944. Permanent magnet 945 is pushed away from electromagnet 941, and the two are completely separated. Simultaneously, since no gear switching is involved, electromagnet 102 is also de-energized. The transmission shaft 94 maintains only a rotational connection with the lead screw 95, without forming a power coupling. The entire moving assembly 9 is in a ready-to-drive state. When the electromagnet 102 is de-energized and has no magnetism, the permanent magnet 107 is pushed away from the electromagnet 102 by the natural elastic force of the spring 106 on the outer ring of the telescopic rod 105, and the two are completely separated. The handle 101 is only sleeved on the outer ring of the transmission shaft 94 through the bearing and can rotate freely without power coupling with the transmission shaft 94. The electric push column 109 is in the retracted state, which drives the moving contact 110 to completely separate from the stationary contact 112 on the arc-shaped insulating plate 111. At this time, the excitation circuit is not connected to any stationary contact 112 and is in the waiting-to-switch state.

[0040] Because the basic gear of the excitation circuit needs to be preset according to the operating requirements of the excitation synchronous condenser, the circuit foundation is laid for subsequent precise adjustment. When the gear needs to be switched, the external control system sends a gear switching command to the circuit board 4 according to the operating conditions of the synchronous condenser. After receiving the command, the circuit board 4 energizes the electromagnet 102 in the handle 101. After the electromagnet 102 is energized, it generates a magnetic attraction force, which overcomes the natural elastic force of the spring 106 and attracts the permanent magnet 107 in the cavity 103 of the drive shaft 94 towards itself. During this process, the permanent magnet 107 drives the telescopic rod 105 to extend axially. The spring 106 is stretched synchronously and stores elastic potential energy until the permanent magnet 107 and the electromagnet 102 are tightly attached. At this time, the handle 101 forms a power connection with the drive shaft 94 through the coupling of the electromagnet 102 and the permanent magnet 107. The handle 101 can rotate synchronously with the drive shaft 94.

[0041] After electromagnetic coupling is completed, the circuit board 4 controls the motor 92 to start. The motor 92 drives the transmission shaft 94 to rotate through the coupling 93. The transmission shaft 94 synchronously drives the handle 101 to rotate. When the handle 101 rotates, the support frame 108 fixed on its outer side rotates together with the handle 101. The electric push column 109 and the moving contact 110 on the support frame 108 also rotate along the trajectory of the arc-shaped insulating plate 111. The circuit board 4 monitors the rotation angle of the handle 101. When the moving contact 110 rotates to directly above the target gear stationary contact 112, the circuit board 4 controls the motor 92 to stop running. The handle 101 and the moving contact 110 are precisely positioned at the target gear position.

[0042] After the moving contact 110 is positioned, the circuit board 4 sends an extension command to the electric push column 109. The output end of the electric push column 109 pushes the moving contact 110 to slide along the handle 101 until the moving contact 110 makes close contact with the target position stationary contact 112 on the arc-shaped insulating plate 111. Since the stationary contact 112 is electrically connected to the circuit board 4, after the moving contact 110 makes contact with the stationary contact 112, the circuit of the target position is connected to the excitation control circuit, completing the switching of the basic position of the excitation circuit. This provides a suitable circuit foundation for adjusting the position of the excitation coil 8 and accurately controlling the excitation intensity through the moving component 9.

[0043] After the gear shift is completed, the circuit board 4 de-energizes the electromagnet 102, causing it to lose its magnetism. The spring 106 releases its stored elastic potential energy, pulling the permanent magnet 107 away from the electromagnet 102. The telescopic rod 105 retracts accordingly, and the permanent magnet 107 and the electromagnet 102 are separated. The handle 101 is disconnected from the drive shaft 94, and the handle 101 can remain in its current position, ensuring stable contact between the moving contact 110 and the stationary contact 112. This prevents the handle 101 from shifting when the drive shaft 94 rotates, thus affecting the gear shift stability.

[0044] When it is necessary to switch from the current gear to another gear, the above steps are reversed. First, the circuit board 4 controls the electric push column 109 to retract, causing the moving contact 110 to separate from the stationary contact 112 of the current gear. Then, the electromagnet 102 is energized, so that the handle 101 and the drive shaft 94 form a power connection. Then, the motor 92 is started to drive the handle 101 and the moving contact 110 to rotate to the new target gear position. The motor 92 stops, and then the electric push column 109 extends, pushing the moving contact 110 to contact the stationary contact 112 of the new target gear and form an electrical connection. Finally, the electromagnet 102 is de-energized, and the handle 101 and the drive shaft 94 are disconnected from the power connection, completing the reverse gear switching to adapt to the new operating conditions of the synchronous condenser.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0046] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An excitation control device for a synchronous condenser, comprising a synchronous condenser body (1), characterized in that: The camera body (1) is equipped with a mounting bracket (2) on its outer ring. A control box (3) is fixed on the mounting bracket (2). A circuit board (4) is installed inside the control box (3). A groove (5) is opened on the inner wall of the control box (3). A slide block (6) is slidably connected in the groove (5). A mounting seat (7) is fixed on the end side of the slide block (6). An excitation coil (8) is installed on the mounting seat (7). A moving component (9) and a switching component (10) are installed on the control box (3). The moving component (9) includes a lead screw (95) rotatably connected inside the control box (3). The slide block (6) is threadedly installed with the lead screw (95).

2. The excitation control device for a synchronous condenser according to claim 1, characterized in that: The control box (3) has a fixed frame (91) on its side wall. A motor (92) is fixed on the fixed frame (91). A coupling (93) is fixed at the output end of the motor (92). A transmission shaft (94) is fixed at the end of the coupling (93). The lead screw (95) is rotatably connected to the transmission shaft (94).

3. The excitation control device for a synchronous condenser according to claim 2, characterized in that: An electromagnet (941) is fixed to the end of the drive shaft (94), and a cavity (942) is opened inside the lead screw (95). The drive shaft (94) is rotatably connected to the cavity (942). A connecting plate (943) is fixed to the inner wall of the cavity (942). A telescopic rod (944) is fixed to the end of the connecting plate (943), and a permanent magnet (945) is fixed to the end of the telescopic rod (944).

4. The excitation control device for a synchronous condenser according to claim 3, characterized in that: The telescopic rod (944) is fitted with a spring (946) on its outer ring. One end of the spring (946) is fixedly connected to the connecting plate (943), and the other end of the spring (946) is fixedly connected to the permanent magnet (945).

5. The excitation control device for a synchronous condenser according to claim 2, characterized in that: The switching assembly (10) includes a handle (101) rotatably mounted on the outer ring of the drive shaft (94), an electromagnet (102) is fixed inside the handle (101), a cavity (103) is opened inside the drive shaft (94), a connecting plate (104) is fixed to the inner wall of the cavity (103), a telescopic rod (105) is fixed to the end side of the connecting plate (104), and a permanent magnet (107) is fixed to the end side of the telescopic rod (105).

6. The excitation control device for a synchronous condenser according to claim 5, characterized in that: The outer ring of the telescopic rod 2 (105) is fitted with a spring 2 (106). One end of the spring 2 (106) is fixedly connected to the connecting plate 2 (104), and the other end of the spring 2 (106) is fixedly connected to the permanent magnet 2 (107).

7. The excitation control device for a synchronous condenser according to claim 6, characterized in that: A support frame (108) is fixed on the handle (101), and an electric push column (109) is fixed on the support frame (108). A moving contact (110) is fixed at the output end of the electric push column (109), and the moving contact (110) is slidably connected to the handle (101).

8. The excitation control device for a synchronous condenser according to claim 7, characterized in that: The control box (3) has an arc-shaped insulating plate (111) fixed on its side wall. A stationary contact (112) is installed on the arc-shaped insulating plate (111). There are multiple stationary contacts (112). The stationary contacts (112) are electrically connected to the circuit board (4).

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