Low-voltage reactive power compensation device

Abstract

The invention relates to the technical field of reactive power, in particular to a low-voltage reactive power compensation device which comprises a reactive power compensation cabinet shell. The low-voltage reactive power compensation device solves the problems that load balance of a circuit in different seasons is different, and a single type of low-voltage reactive power compensation device cannot be completely suitable for circuits in different environments; if it rains outside in a high-temperature time period in summer and a heat dissipation mechanism on the low-voltage reactive power compensation device is in a running state, the low-voltage reactive power compensation device cannot be completely suitable for circuits in different environments; external moisture can enter the interior of the equipment; the power grid line can be connected with the split-phase compensation set or the three-phase compensation set according to the load balance fluctuation amplitude of the power grid line, moisture in cooling gas discharged by the cooler can be absorbed through the net-shaped filtering sponge plate, and corresponding adjustment can be conducted according to the actual operation condition of a power grid. Therefore, the compensation effect of the equipment is improved, and external steam can be prevented from entering the equipment when the heat dissipation mechanism runs.

Description

Technical Field

[0001] The invention relates to the technical field of reactive power, in particular to a low-voltage reactive power compensation device. Background Art

[0002] Low voltage reactive power compensation device is a kind of power equipment used to improve the power factor of the power grid, reduce the loss of power supply transformers and transmission lines, improve power supply efficiency and improve the power supply environment. It plays an important role in industrial production and power systems. The following is some key information about low voltage reactive power compensation device.

[0003] Existing low-voltage reactive power compensation devices are mainly divided into two types. One is a phase-splitting low-voltage reactive power compensation device, which can compensate each phase circuit separately and can be precisely adjusted according to the specific conditions of each phase. It is suitable for scenarios where the load changes frequently and the load differences between each phase are large. The other is a three-phase low-voltage reactive power compensation device, which can compensate the circuit as a whole at the same time and is suitable for situations where the load is relatively balanced.

[0004] However, the load balancing effect of the circuit in different seasons will be affected by the change of seasonal load. For example, in summer and autumn, the power demand will increase due to the use of cooling equipment such as air conditioners, while in winter and spring, the power demand is relatively low. This seasonal change leads to large differences in the load balance of the circuit in different seasons. Therefore, a single type of low-voltage reactive power compensation device cannot be fully applicable to circuits in different environments. When it is in the high temperature period of summer, if it rains outside and the heat dissipation mechanism on the low-voltage reactive power compensation device is in operation, the external moisture will be brought into the interior of the equipment, thereby increasing the humidity inside the equipment, which may eventually cause the equipment to malfunction due to the high humidity environment; therefore, it does not meet the existing needs, and we have proposed a low-voltage reactive power compensation device for this. Summary of the invention

[0005] The purpose of the present invention is to provide a low-voltage reactive power compensation device to solve the problem that the load balancing effect of the circuit proposed in the above background technology in different seasons will be affected by seasonal load changes. For example, in summer and autumn, due to the use of cooling equipment such as air conditioners, the power demand will increase, while in winter and spring, the power demand is relatively low. This seasonal change causes the load balance of the circuit in different seasons to vary greatly, so that a single type of low-voltage reactive power compensation device cannot be fully applicable to circuits in different environments. If it rains outside during the high temperature period in summer and the heat dissipation mechanism on the low-voltage reactive power compensation device is in operation, the external moisture will be brought into the interior of the device, thereby increasing the humidity inside the device, which may eventually cause the device to malfunction due to the high humidity environment.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a low-voltage reactive power compensation device, comprising a reactive compensation cabinet shell, a dehumidification cooling mechanism is fixedly installed on one side of the rear end surface of the reactive compensation cabinet shell, the dehumidification cooling mechanism comprises a cooler, an air outlet, a mesh filter sponge plate, a water source outlet, two metal meshes and two extrusion cylinders, the air outlet is located in front of the cooler, the mesh filter sponge plate is located inside the air outlet, the two metal meshes are respectively located in front and behind the mesh filter sponge plate, the water source outlet is located below the mesh filter sponge plate, and the piston rods of the two extrusion cylinders are respectively connected to the two sides of the front end surface of the first metal mesh from left to right;

[0007] The backpack of the reactive compensation cabinet is fixedly installed with a highly adaptable compensation mechanism, which includes a slide rail, an intelligent slide, a phase compensation group, a three-phase compensation group, a square frame, a square movable plate, a plurality of grid line adapters, a number of phase compensation adapters and three-phase compensation adapters that are the same as the grid line adapters, and a self-locking connection mechanism, wherein the phase compensation group and the three-phase compensation group are respectively located on both sides of the rear of the slide rail, and a plurality of the phase compensation adapters and the three-phase compensation adapters are respectively located in front of the phase compensation group and the three-phase compensation group, and the phase compensation adapters and the three-phase compensation adapters are connected to the phase compensation group and the three-phase compensation group through power connection lines;

[0008] The intelligent slide is installed on the outer surface of the slide rail, the square frame is fixed to the surface of the intelligent slide facing the phase compensation group, the square movable plate is located inside the square frame, the outer surface of the square movable plate is in contact with the inner wall of the square frame, and the square movable plate and the square frame are slidingly connected, and multiple power line adapters are fixedly installed with the outer surface of the square movable plate, and the position of the power line adapter corresponds to the position of the phase compensation adapter, and the self-locking connection mechanism can drive the square movable plate to move forward and backward and lock it.

[0009] Preferably, the highly adaptable compensation mechanism further comprises a reactive compensation cabinet control unit, a strip through hole located on the upper end surface of the square frame is provided below the reactive compensation cabinet control unit, a plurality of grid lines are provided inside the strip through hole, and the surface of the grid line facing the grid line adapter is connected to the grid line adapter;

[0010] The dehumidification cooling mechanism and the high-adaptability compensation mechanism are both electrically connected to the reactive power compensation cabinet control unit.

[0011] Preferably, a power grid sensor is installed on one side of the outer surface of the power grid line, the rear end face of the power grid sensor is connected to a data connection line, the other end of the data connection line is connected to a thyristor connector, and the data connection line is connected to the control unit of the reactive compensation cabinet through the thyristor connector; the wire core located inside the data connection line is formed by an integrated silver-plated copper wire core.

[0012] Preferably, the self-locking connection mechanism includes a metal shell, a stepper motor is fixedly installed on one side of the interior of the metal shell, an internal thread groove is provided at the rear of the stepper motor, a threaded push rod matching its internal thread is provided inside the internal thread groove, a square slot is provided in the middle position of the front end surface of the threaded push rod, a square rotating shaft is inserted into the inside of the square slot, and the front end surface of the square rotating shaft is connected to the output shaft of the stepper motor through a coupling.

[0013] Preferably, the inner wall cross-section of the square slot is a square, the outer surface of the square shaft fits the inner wall of the square slot, and the square shaft is slidably connected to the square slot.

[0014] Preferably, a connecting rod is fixedly connected to the middle position of the rear end surface of the threaded push rod, a connecting plate is provided on the outer side of the rear end of the connecting rod, a cylindrical groove is provided inside the connecting plate, a metal ring fixedly sleeved on the outer surface of the connecting rod is provided inside the cylindrical groove, a spring sleeved on the outer surface of the connecting rod is provided in front of the metal ring, and both ends of the spring are respectively connected to the threaded push rod and the connecting plate.

[0015] Preferably, a push plate is fixedly connected to both sides of the rear end surface of the connecting plate, and the surface of the push plate facing the phase compensation adapter is fixed to the phase compensation adapter, a transfer groove is provided on both sides of the front end surface of the phase compensation adapter and the three-phase compensation adapter, and a transfer connector whose position corresponds to the transfer groove is connected to both sides of the rear end surface of the power grid line adapter.

[0016] Preferably, a clamping block is provided at the upper and lower parts of the connecting rod, and the surface of the clamping block facing the threaded pushing rod is an inclined surface.

[0017] Preferably, a card slot is provided on one side of the outer surface of the card block, and an L-shaped fixing rod is provided on one side of the card slot, the shape of the top end of the L-shaped fixing rod corresponds to the shape of the inner wall of the card slot, and the surface of the L-shaped fixing rod facing the connecting plate is fixed to the connecting plate.

[0018] Preferably, a metal rod is provided on both sides of the block, and a reset spring is sleeved on the outer surface of the metal rod. The surface of the reset spring facing the connecting rod is connected to a guide sleeve movably sleeved on the outer surface of the metal rod, and the surface of the guide sleeve facing the block is fixed between the block.

[0019] The present invention uses a highly adaptable compensation mechanism to connect the grid line with a phase compensation group or a three-phase compensation group according to the load balance fluctuation amplitude of the grid line. When the grid load is relatively balanced, the three-phase compensation group can more effectively compensate the entire grid, thereby improving the power factor and reducing line loss, thereby improving the load capacity and power supply quality of the grid. When the grid load is unbalanced or fluctuates greatly, the phase compensation group can be adjusted more accurately to meet the needs of unbalanced loads, reduce line losses and improve power transmission efficiency. The above technical solution can be used to make corresponding adjustments according to the actual operating conditions of the grid, thereby improving the compensation effect of the equipment. When it is in the high temperature period in summer and it rains outside and the cooler is in operation, the mesh filter sponge plate can absorb the moisture inside the cooling gas discharged by the cooler, thereby preventing the moisture from the outside from entering the interior of the cooler along with the cooling gas, thereby causing the reactive compensation cabinet shell to malfunction due to the overly humid internal environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a front view of the internal structure of the present invention;

[0022] Figure 3 For the present invention Figure 2 A magnified view of the structure at center A;

[0023] Figure 4 For the present invention Figure 2 A magnified view of the structure at B in the middle;

[0024] Figure 5 For the present invention Figure 4 A magnified view of the structure at C in the middle;

[0025] Figure 6 For the present invention Figure 5 Enlarged view of the structure at D in the middle. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] See also Figures 1 to 6The low-voltage reactive power compensation device provided by the present invention comprises a reactive compensation cabinet 1, a dehumidification cooling mechanism 2 is fixedly installed on one side of the rear end surface of the reactive compensation cabinet 1, the dehumidification cooling mechanism 2 comprises a cooler 201, an air outlet 202, a mesh filter sponge plate 203, a water source outlet 206, two metal meshes 204 and two extrusion cylinders 205, the air outlet 202 is located in front of the cooler 201, the mesh filter sponge plate 203 is located inside the air outlet 202, the two metal meshes 204 are respectively located in front and behind the mesh filter sponge plate 203, and the water source The discharge port 206 is located below the mesh filter sponge plate 203, and the piston rods of the two extrusion cylinders 205 are respectively connected to the two sides of the front end surface of the first metal mesh 204 from left to right; when it is in the high temperature period in summer and it is raining outside and the cooler 201 is in operation, the mesh filter sponge plate 203 can absorb the moisture inside the cooling gas discharged by the cooler 201, so as to prevent the moisture from the outside from entering the cooler 201 together with the cooling gas, thereby causing the reactive compensation cabinet shell 1 to malfunction due to the overly humid internal environment;

[0028] Every hour, the extrusion cylinder 205 in the dehumidification cooling mechanism 2 will push the metal mesh 204 connected to it backwards. As the metal mesh 204 moves, the mesh filter sponge plate 203 in contact with the metal mesh 204 will be squeezed to squeeze out the moisture inside the mesh filter sponge plate 203, and the squeezed water will flow to the outside through the water source outlet 206. The above technical solution can prevent the outside from raining for too long, which will cause the mesh filter sponge plate 203 to be full of moisture and unable to absorb more moisture, thereby causing it to lose its original function.

[0029] Furthermore, the backpack of the reactive compensation cabinet shell 1 is fixedly installed with a highly adaptable compensation mechanism, which includes a slide rail 5, an intelligent slide 6, a phase compensation group 7, a three-phase compensation group 8, a square frame 11, a square movable plate 13, a plurality of grid line adapters 14, a number of phase compensation adapters 9 and a three-phase compensation adapter 37 which are the same as the grid line adapters 14, and a self-locking connection mechanism, the phase compensation group 7 and the three-phase compensation group 8 are respectively located on both sides behind the slide rail 5, a plurality of phase compensation adapters 9 and a three-phase compensation adapter 37 are respectively located in front of the phase compensation group 7 and the three-phase compensation group 8, and the phase compensation adapter 9 and the three-phase compensation adapter 37 are connected to the phase compensation group 7 and the three-phase compensation group 8 through power connection lines.

[0030] The intelligent slide 6 is installed on the outer surface of the slide rail 5, the square frame 11 is fixed to the surface of the intelligent slide 6 facing the phase compensation group 7, the square movable plate 13 is located inside the square frame 11, the outer surface of the square movable plate 13 is in contact with the inner wall of the square frame 11, and the square movable plate 13 is slidingly connected to the square frame 11, and multiple power line adapters 14 are fixedly installed on the outer surface of the square movable plate 13, and the position of the power line adapter 14 corresponds to the position of the phase compensation adapter 9, and the self-locking connection mechanism can drive the square movable plate 13 to move forward and backward and lock it.

[0031] See also Figures 1 to 6 The highly adaptable compensation mechanism provided by the present invention also includes a reactive compensation cabinet control unit 3, and a strip through hole 12 located on the upper end surface of the square frame 11 is provided below the reactive compensation cabinet control unit 3, and a plurality of grid lines 4 are provided inside the strip through hole 12, and the surface of the grid line 4 facing the grid line adapter 14 is connected to the grid line adapter 14; the grid line 4 can be connected to the grid line adapter 14 through the strip through hole 12.

[0032] The dehumidification cooling mechanism 2 and the high-adaptability compensation mechanism are both electrically connected to the reactive power compensation cabinet control unit 3; the reactive power compensation cabinet control unit 3 can control the dehumidification cooling mechanism 2 and the high-adaptability compensation mechanism.

[0033] A grid sensor 34 is installed on one side of the outer surface of the grid line 4, and a data connection line 35 is connected to the rear end face of the grid sensor 34, and the other end of the data connection line 35 is connected to a thyristor connector 38, and the data connection line 35 is connected to the reactive power compensation cabinet control unit 3 through the thyristor connector 38; the reactive power compensation cabinet control unit 3 is connected to the grid line 4 through the thyristor connector 38, the data connection line 35 and the grid sensor 34, so that the reactive power compensation cabinet control unit 3 can monitor the grid load balance of the grid line 4 in real time through this connection, so as to control whether the grid line 4 is connected to the phase compensation group 7 or the three-phase compensation group 8; the wire core located inside the data connection line 35 is made of an integrated silver-plated copper wire core; the quick conduction characteristics of the silver-plated copper wire core improve the response speed of the reactive power compensation cabinet control unit 3.

[0034] See also Figures 1 to 6The self-locking connection mechanism provided by the present invention includes a metal shell 16, a stepper motor 19 is fixedly installed on one side of the metal shell 16, an internal thread groove 20 is provided at the rear of the stepper motor 19, a threaded push rod 21 matching its internal thread is provided inside the internal thread groove 20, a square slot 22 is provided in the middle position of the front end surface of the threaded push rod 21, a square shaft 36 is inserted into the square slot 22, and the front end surface of the square shaft 36 is connected to the output shaft of the stepper motor 19 through a coupling; when the grid load of the grid line 4 changes frequently and the load difference of each phase is large, and compensation operation needs to be performed through the phase compensation group 7, the stepper motor 19 is started, and the stepper motor 19 can drive the square shaft 36 connected thereto to rotate.

[0035] The inner wall cross-section of the square slot 22 is a square, the outer surface of the square shaft 36 fits with the inner wall of the square slot 22, and the square shaft 36 and the square slot 22 are slidably connected; since the outer surface of the square shaft 36 fits with the inner wall of the square slot 22 located at the front end face of the threaded push rod 21, when the square shaft 36 rotates, the threaded push rod 21 will rotate synchronously therewith, and through the transmission of the inner thread of the inner thread groove 20, the rotating threaded push rod 21 will move forward and backward accordingly, thereby moving the threaded push rod 21 backward.

[0036] A connecting rod 25 is fixedly connected to the middle position of the rear end surface of the threaded push rod 21, a connecting plate 17 is provided on the outer side of the rear end of the connecting rod 25, a cylindrical groove 23 is provided inside the connecting plate 17, a metal ring 24 fixedly sleeved on the outer surface of the connecting rod 25 is provided inside the cylindrical groove 23, a spring 26 sleeved on the outer surface of the connecting rod 25 is provided in front of the metal ring 24, and both ends of the spring 26 are respectively connected to the threaded push rod 21 and the connecting plate 17; after the threaded push rod 21 moves backward, the connecting plate 17 indirectly connected to it will move with it.

[0037] A push plate 18 is fixedly connected to both sides of the rear end surface of the connecting plate 17, and the surface of the push plate 18 facing the phase compensation adapter 9 is fixed to the phase compensation adapter 9. A transfer groove 10 is provided on both sides of the front end surface of the phase compensation adapter 9 and the three-phase compensation adapter 37, and a transfer connector 15 whose position corresponds to the transfer groove 10 is connected to both sides of the rear end surface of the grid line adapter 14; when the connecting plate 17 moves, the square movable plate 13 connected to it through the push plate 18 and the grid line adapter 14 installed on the square movable plate 13 will move backward synchronously, and as the grid line adapter 14 moves, the transfer connector 15 connected to the rear end surface of the grid line adapter 14 will be inserted into the inside of the transfer groove 10 located on the front end surface of the phase compensation adapter 9, so as to connect the grid line 4 with the phase compensation group 7, and at this time, the compensation operation can be performed through the phase compensation group 7.

[0038] A block 27 is provided at the upper and lower parts of the connecting rod 25, and the surface of the block 27 facing the threaded push rod 21 is an inclined surface 28; when the adapter connector 15 has just been fully inserted into the adapter slot 10, do not turn off the stepper motor 19. At this time, continue to move the threaded push rod 21 backward through the stepper motor 19. As the threaded push rod 21 moves at this time, the spring 26 located between the threaded push rod 21 and the connecting plate 17 will be squeezed and contacted with the inclined surface 28 located on the outer surface of the block 27, and as the threaded push rod 21 continues to move, the block 27 will be pushed outward.

[0039] A slot 29 is provided on one side of the outer surface of the block 27, and an L-shaped fixing rod 30 is provided on one side of the slot 29. The shape of the top end of the L-shaped fixing rod 30 corresponds to the shape of the inner wall of the slot 29, and the surface of the L-shaped fixing rod 30 facing the connecting plate 17 is fixed to the connecting plate 17; when the connecting plate 17 moves, the L-shaped fixing rod 30 fixed thereto will move along with it. When the adapter connector 15 is fully inserted into the inside of the adapter slot 10, the top end of the L-shaped fixing rod 30 will also move to the position corresponding to the slot 29 on the outer surface of the block 27. As the block 27 is pushed outward, the top end of the L-shaped fixing rod 30 will enter the inside of the slot 29 on the outer surface of the block 27, so as to fix the L-shaped fixing rod 30 and the grid line adapter 14 indirectly connected to the L-shaped fixing rod 30 at the current position, so as to prevent it from moving without authorization due to external force, thereby causing the connection between the grid line 4 and the phase compensation group 7 to be disconnected.

[0040] A metal rod 31 is provided on both sides of the block 27, and a return spring 33 is sleeved on the outer surface of the metal rod 31. The return spring 33 is connected to a guide sleeve 32 movably sleeved on the outer surface of the metal rod 31 on the surface facing the connecting rod 25, and the guide sleeve 32 is fixed to the block 27 on the surface facing the block 27; during the movement of the block 27, the guide sleeve 32 fixed to it will move together and squeeze the return spring 33. When it is necessary to connect the power grid line 4 with the three-phase compensation group 8, the threaded push rod 21 is moved forward by the stepping motor 19. With the movement of the threaded push rod 21 and the reaction force of the squeezed return spring 33, the block 27 will gradually move inwards to release the fixation of the L-shaped fixing rod 30.

[0041] When the threaded push rod 21 just moves forward, the fixed connecting plate 17 will not move forward with it. Only when the top end of the L-shaped fixing rod 30 completely leaves the inside of the card slot 29 and the squeezed spring 26 returns to its original state, the connecting plate 17 will move forward with the advancement of the threaded push rod 21. When the adapter connector 15 completely leaves the inside of the adapter slot 10 on the phase compensation adapter 9, the square frame 11 fixed thereto and the grid line adapter 14 on the square moving plate 13 installed inside the square frame 11 are moved by the intelligent slide 6. At this time, multiple grid line adapters 14 are moved to the connection with multiple three-phase compensation adapters. 37, and then the grid line 4 and the three-phase compensation group 8 are connected in the same way. Through the above technical solution, when the grid load is relatively balanced, the three-phase compensation group 8 can compensate the entire grid more effectively, so as to improve the power factor, reduce line loss, and thus improve the load capacity and power supply quality of the grid. When the grid load is unbalanced or fluctuates greatly, the phase compensation group 7 can be adjusted more accurately to meet the needs of unbalanced loads, reduce line losses and improve power transmission efficiency. Through the above technical solution, corresponding adjustments can be made according to the actual operating conditions of the grid, so as to improve the compensation effect of the equipment.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A low voltage reactive power compensation device, including a reactive power compensation cabinet, characterized in that: A dehumidification cooling mechanism is fixedly installed on one side of the rear end face of the reactive compensation cabinet shell, and the dehumidification cooling mechanism includes a cooler, an air outlet, a mesh filter sponge plate, a water source outlet, two metal meshes and two extrusion cylinders, the air outlet is located in front of the cooler, the mesh filter sponge plate is located inside the air outlet, the two metal meshes are respectively located in front and behind the mesh filter sponge plate, the water source outlet is located below the mesh filter sponge plate, and the piston rods of the two extrusion cylinders are respectively connected to the two sides of the front end face of the first metal mesh from left to right; The backpack of the reactive compensation cabinet is fixedly installed with a highly adaptable compensation mechanism, which includes a slide rail, an intelligent slide, a phase compensation group, a three-phase compensation group, a square frame, a square movable plate, a plurality of grid line adapters, a number of phase compensation adapters and three-phase compensation adapters that are the same as the grid line adapters, and a self-locking connection mechanism, wherein the phase compensation group and the three-phase compensation group are respectively located on both sides of the rear of the slide rail, and a plurality of the phase compensation adapters and the three-phase compensation adapters are respectively located in front of the phase compensation group and the three-phase compensation group, and the phase compensation adapters and the three-phase compensation adapters are connected to the phase compensation group and the three-phase compensation group through power connection lines; The intelligent slide is installed on the outer surface of the slide rail, the square frame is fixed to the surface of the intelligent slide facing the phase compensation group, the square movable plate is located inside the square frame, the outer surface of the square movable plate is in contact with the inner wall of the square frame, and the square movable plate and the square frame are slidingly connected, and multiple power line adapters are fixedly installed with the outer surface of the square movable plate, and the position of the power line adapter corresponds to the position of the phase compensation adapter, and the self-locking connection mechanism can drive the square movable plate to move forward and backward and lock it.

2. The low-voltage reactive power compensation device according to claim 1, characterized in that: The highly adaptable compensation mechanism also includes a reactive compensation cabinet control unit, a strip-shaped through hole located on the upper end surface of the square frame is provided below the reactive compensation cabinet control unit, a plurality of grid lines are provided inside the strip-shaped through hole, and the surface of the grid line facing the grid line adapter is connected to the grid line adapter; The dehumidification cooling mechanism and the high-adaptability compensation mechanism are both electrically connected to the reactive power compensation cabinet control unit.

3. The low-voltage reactive power compensation device according to claim 2, characterized in that: A power grid sensor is installed on one side of the outer surface of the power grid line, and a data connection line is connected to the rear end face of the power grid sensor. The other end of the data connection line is connected to a thyristor connector, and the data connection line is connected to the control unit of the reactive power compensation cabinet through the thyristor connector; the wire core located inside the data connection line is formed by an integrated silver-plated copper wire core.

4. The low-voltage reactive power compensation device according to claim 1, characterized in that: The self-locking connection mechanism includes a metal shell, a stepper motor is fixedly installed on one side of the metal shell, an internal thread groove is provided at the rear of the stepper motor, a threaded push rod matching the internal thread of the internal thread groove is provided inside the internal thread groove, a square slot is provided in the middle position of the front end surface of the threaded push rod, a square rotating shaft is inserted into the square slot, and the front end surface of the square rotating shaft is connected to the output shaft of the stepper motor through a coupling.

5. The low-voltage reactive power compensation device according to claim 4, characterized in that: The inner wall cross-section of the square slot is in a square shape, the outer surface of the square shaft fits the inner wall of the square slot, and the square shaft is slidably connected to the square slot.

6. The low voltage reactive power compensation device according to claim 4, characterized in that: A connecting rod is fixedly connected to the middle position of the rear end surface of the threaded push rod, a connecting plate is provided on the outer side of the rear end of the connecting rod, a cylindrical groove is provided inside the connecting plate, a metal ring fixedly sleeved on the outer surface of the connecting rod is provided inside the cylindrical groove, a spring sleeved on the outer surface of the connecting rod is provided in front of the metal ring, and both ends of the spring are respectively connected to the threaded push rod and the connecting plate.

7. The low-voltage reactive power compensation device according to claim 6, characterized in that: A push plate is fixedly connected to both sides of the rear end surface of the connecting plate, and the surface of the push plate facing the phase compensation adapter is fixed to the phase compensation adapter. A transfer groove is provided on both sides of the front end surface of the phase compensation adapter and the three-phase compensation adapter, and a transfer connector whose position corresponds to the transfer groove is connected to both sides of the rear end surface of the grid line adapter.

8. The low-voltage reactive power compensation device according to claim 6, characterized in that: A clamping block is provided at the upper and lower parts of the connecting rod, and the surface of the clamping block facing the threaded pushing rod is an inclined surface.

9. The low-voltage reactive power compensation device according to claim 8, characterized in that: A card slot is provided on one side of the outer surface of the card block, and an L-shaped fixing rod is provided on one side of the card slot. The shape of the top end of the L-shaped fixing rod corresponds to the shape of the inner wall of the card slot, and the surface of the L-shaped fixing rod facing the connecting plate is fixed to the connecting plate.

10. The low-voltage reactive power compensation device according to claim 8, characterized in that: A metal rod is provided on both sides of the block, and a return spring is sleeved on the outer surface of the metal rod. The surface of the return spring facing the connecting rod is connected to a guide sleeve movably sleeved on the outer surface of the metal rod, and the surface of the guide sleeve facing the block is fixed between the block.

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