Grounding resistance reducing device of oil-immersed transformer and using method of grounding resistance reducing device

Abstract

According to the grounding resistance reducing device of the oil-immersed transformer and the using method of the grounding resistance reducing device, the grounding resistance reducing device is arranged on one side of a body of the oil-immersed transformer, the oil-immersed transformer is provided with a grounding wire, the grounding wire is connected with a grounding electrode inserted into the ground, and a resistance reducing device is arranged over the grounding electrode. The resistance reduction device comprises a rainwater collection pool located on the ground, a conductive material chamber arranged in the rainwater collection pool and a plurality of liquid distribution pipes communicated with the rainwater collection pool, the liquid distribution pipes are inserted underground and located around the grounding electrode, a plurality of liquid outlet holes facing the grounding electrode are formed in the liquid distribution pipes, and soil monitoring units are arranged on the lower portions of the liquid distribution pipes; a first automatic discharging valve is arranged on the lower portion of the rainwater collecting pool, a water level monitoring unit is arranged in the first automatic discharging valve, the first automatic discharging valve is provided with a liquid outlet located in the lower portion, and the upper portions of the liquid distribution pipes are all communicated with the liquid outlet. Rainwater in the rainwater collecting pool is discharged through the first automatic discharging valve, and the rainwater flows to the position near the grounding electrode through the multiple liquid distribution pipes, so that the conductivity of soil is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil-immersed transformers, and in particular to a grounding resistance reduction device for an oil-immersed transformer and a use method thereof. Background Art

[0002] The grounding of oil-immersed transformers is a key part of their safe operation. The main purpose is to ensure that the metal casing and internal components of the transformer can maintain a safe potential under normal and fault conditions. The grounding method of oil-immersed transformers is generally to conduct electricity to the earth through a grounding wire and a grounding electrode connected to it.

[0003] During long-term use, the conductivity of the soil near the grounding electrode will gradually decrease, causing the grounding resistance to increase, and there will be safety hazards in the operation of the oil-immersed transformer. The existing technology for increasing soil conductivity includes spreading salt near the grounding electrode, or pouring water or salt water into the soil to increase the conductivity of the soil.

[0004] However, it is not easy to control the salt content in this method. If the salt content is low, the effect of improving soil conductivity is not obvious, and if the salt content is high, it will lead to salinization. Moreover, this method of supplementing salt in the later stage is more complicated to operate, and the salt water needs to be mixed in advance and transported to the destination. If it is outdoors in the suburbs, transportation is more inconvenient, and the grounding electrode is located deep underground, and the salt water is not easy to penetrate to the vicinity of the underground grounding electrode, which also affects the conductivity of the soil. Summary of the invention

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a grounding resistance reduction device for an oil-immersed transformer and a method for using the same.

[0006] The technical solution of the present invention is as follows:

[0007] A grounding resistance reduction device for an oil-immersed transformer is arranged on one side of the body of the oil-immersed transformer. The oil-immersed transformer is provided with a grounding wire, which is connected to a grounding electrode inserted into the ground. A resistance reduction device is provided just above the grounding electrode. The resistance reduction device comprises a rainwater collection pool located on the ground, a conductive material chamber arranged therein, and a plurality of liquid distribution pipes connected to the rainwater collection pool. The plurality of liquid distribution pipes are inserted underground and are located around the grounding electrode. The liquid distribution pipes are provided with a plurality of liquid outlet holes facing the grounding electrode, and a soil monitoring unit is provided at the lower part of the liquid distribution pipes.

[0008] A first automatic discharge valve is provided at the lower part of the rainwater collection pool, in which a water level monitoring unit is provided, the first automatic discharge valve has a liquid outlet located at the lower part, and the upper parts of the plurality of liquid distribution pipes are all connected to the liquid outlet;

[0009] The conductive material chamber is located at the upper part of the inner side of the rainwater collection tank, a second automatic discharge valve is arranged at the lower part of the conductive material chamber, and a leakage hole is opened at one side of the rainwater collection tank and is located below the discharge port of the second automatic discharge valve;

[0010] A filtering assembly is provided on the upper part of the rainwater collection pool, and a stirring assembly is provided inside the rainwater collection pool. The stirring assembly includes a first stirring shaft and a first stirring blade arranged thereon. The first stirring shaft passes through the drainage hole in the horizontal direction and is rotatably connected to the rainwater collection pool. One end of the first stirring shaft extends to the outside of the rainwater collection pool, and a first stirring shaft driving member is provided thereon. The first stirring shaft driving member can be a first windmill, and the first stirring shaft and the first stirring blade are driven to rotate by external wind power, so as to stir and mix rainwater and conductive materials.

[0011] The soil monitoring unit, the first automatic discharging valve and the second automatic discharging valve are electrically connected to an external control module respectively.

[0012] A plurality of distribution pipes are arranged below the rainwater collection pool, and the distribution pipes are vertically distributed around the grounding electrode. The rainwater collection pool is used to collect rainwater. When the soil monitoring unit detects that the electrical conductivity of the soil is low, which will reduce the safety of the oil-immersed transformer, the rainwater collected in the rainwater collection pool is mixed with the conductive medium (such as salt) discharged from the conductive material room to form a conductive solution. The first automatic discharge valve allows the conductive solution to flow into the soil through the outlet hole of the distribution pipe, so that the conductivity of the soil near the grounding electrode is increased and the resistance is reduced, so that the oil-immersed transformer can operate safely and stably. This method of improving soil conductivity is simple and can make rational use of rainwater.

[0013] In order to prevent the conductive material from clumping in the conductive material chamber and preventing it from flowing out of the discharge port smoothly, a second stirring shaft parallel to the first stirring shaft is provided in the conductive material chamber, and a second stirring blade is provided on the second stirring shaft. The second stirring shaft passes through the conductive material chamber and the rainwater collection tank, and is connected to the second stirring shaft driving member outside the rainwater collection tank. The second stirring shaft driving member can be a second windmill, which can rotate under the drive of wind all day long, and then the second stirring blade is driven to rotate through the second stirring shaft, thereby breaking up the solid particles of the conductive material.

[0014] The specific structure of the above-mentioned leakage hole is that the leakage hole includes a central hole and multiple through holes connected along its periphery. The first stirring shaft is connected to the central hole through a bearing sleeved thereon. The multiple through holes can discharge excess rainwater collected in the rainwater collection pool to prevent rainwater from flooding the discharge port of the second automatic discharge valve.

[0015] In order to reduce the mutual interference between the first stirring shaft driving member and the second stirring shaft driving member during rotation, the first stirring shaft driving member and the second stirring shaft driving member are arranged alternately up and down.

[0016] Regarding the structure of the first stirring shaft driving component, the first stirring shaft driving component includes a first windmill, and the second stirring shaft driving component includes a second windmill. The blade length of the first windmill is greater than the blade length of the second windmill, and the vertical spacing between the first windmill and the second windmill in the horizontal direction is greater than 2 times the blade length of the first windmill. By using the first windmill and the second windmill to drive the corresponding stirring shafts to rotate using wind energy, the wind energy can be reasonably utilized, which plays a role in energy saving and environmental protection.

[0017] The speed, time and duration of the rotation of the first windmill by relying on wind energy are all uncontrollable. In order to improve the first stirring shaft to drive the first stirring blade to rotate normally when the conductive material and rainwater need to be stirred, a driving motor is provided at one end of the first stirring shaft away from the first windmill. The driving motor has a rotating shaft, which is connected to the first stirring shaft through a connector, and the driving motor can drive the first stirring shaft to rotate. The driving motor is electrically connected to a plurality of solar panels arranged outside the rainwater collection pool, and the driving motor is electrically connected to the control module. The solar panels can convert solar energy into electrical energy and store it through an external battery connected thereto. Then, the direct current is converted into alternating current that can be used by the driving motor through an external power conversion device (such as an inverter). When the driving motor is not in operation, the rotating shaft of the driving motor can be driven to rotate by the first windmill.

[0018] Regarding the specific structure of the filter assembly, the filter assembly includes a flat filter and an arc filter located thereon. The flat filter is arranged at the upper port of the rainwater collection pool. The mesh holes of the arc filter are larger than those of the flat filter. The arc filter can filter external impurities to prevent more impurities and garbage from falling into the rainwater collection pool and affecting the liquid output of the first automatic discharge valve. Moreover, its mesh holes are relatively large and will not affect the rainwater falling into the rainwater collection pool.

[0019] A method for using a grounding resistance reduction device for an oil-immersed transformer comprises the following steps:

[0020] S1. Drill multiple holes around the grounding electrode, insert the liquid distribution pipe with the soil monitoring unit into the corresponding holes, and install the rainwater collection tank on the ground;

[0021] S2, the soil monitoring unit and the water level monitoring unit transmit the detected electrical signals to the control module respectively, and the control module converts the electrical signals transmitted by the soil monitoring unit into conductivity detection values, and converts the electrical signals detected by the water level monitoring unit into water level detection values. If the conductivity detection value is greater than or equal to the set conductivity threshold, the first automatic discharge valve and the second automatic discharge valve do not operate;

[0022] S3, if the conductivity detection value is less than the set conductivity threshold, and the water level detection value is greater than the set water level threshold, the control module simultaneously sends a start signal to the second automatic discharge valve and the drive motor respectively, and the second automatic discharge valve opens the discharge port according to the start signal, and the opening time is 10-30s. At the same time, the first stirring shaft drives the first stirring blade to rotate and stir the rainwater and the conductive material discharged from the conductive material chamber;

[0023] S4, after the stirring component stirs for a set time, the control module sends a start signal to the first automatic discharge valve, and the first automatic discharge valve opens the liquid outlet according to the start signal, and the opening time is 1-10 minutes;

[0024] S5. After the liquid outlet of the first automatic discharging valve is closed, the control module sends a closing signal to the driving motor, and the driving motor stops running according to the closing signal;

[0025] S6, the soil monitoring unit continuously monitors the conductivity of the soil and regularly sends an electrical signal to the control module. If the conductivity detection value is less than the set conductivity threshold, S3 is executed;

[0026] If the conductivity detection value is greater than or equal to the set conductivity threshold, S2 is executed.

[0027] The beneficial effects of the present invention are:

[0028] Rainwater is collected in a rainwater collection pool. When the soil near the grounding electrode is dry and the conductivity is reduced, the rainwater in the rainwater collection pool can be discharged through the first automatic discharge valve. The rainwater flows into the vicinity of the grounding electrode through multiple liquid distribution pipes. The rainwater reacts with the minerals and organic matter in the soil, further dissolves these substances, and releases more ions. These ions move freely in the soil solution, thereby increasing the conductivity of the soil. In addition, rainwater can also improve the moisture of the soil and reduce the resistivity of the soil, thereby further improving the conductivity of the soil;

[0029] In order to further improve the conductivity of the soil, a conductive material chamber containing conductive materials is set in the rainwater collection pool. The conductive materials are discharged into the rainwater collection pool through the second automatic discharge valve, stirred by the stirring component, and the first automatic discharge valve is opened to discharge the stirred conductive solution into the soil through the liquid separation pipe. Compared with rainwater, the conductivity of the soil can be significantly improved.

[0030] The first automatic discharge valve and the second automatic discharge valve can be opened and closed separately through an external control module to realize the switching between rainwater and the solution with conductive material, so as to avoid excessive use of the conductive solution with salt and the phenomenon of soil salinization, that is, rainwater and the solution with conductive material can be alternately transported into the soil;

[0031] By utilizing the first windmill rotated by wind energy, rainwater and conductive materials can be stirred and mixed, achieving energy-saving and environmental protection effects; if it is necessary to stir rainwater and conductive materials, and the first windmill cannot rotate by utilizing wind energy, the control module can be used to control the driving motor to drive the first stirring shaft and the first stirring blade thereon to rotate, and after the rainwater and conductive materials are stirred and mixed for a certain period of time, they are discharged into the soil to achieve uniform distribution of the conductive solution;

[0032] By utilizing the second windmill rotated by wind energy, the second stirring blade can be driven to rotate in the conductive material chamber, so as to break up the agglomerated conductive material, thereby preventing the conductive material from being unable to be smoothly discharged into the rainwater collection pool after agglomeration. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In the attached picture:

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure;

[0035] Figure 2 for Figure 1 The enlarged structural diagram at A in the middle;

[0036] Figure 3 It is the left view;

[0037] Figure 4 It is a schematic diagram of the position of the resistance reduction device on the soil;

[0038] Figure 5 It is a partial cross-sectional structural schematic diagram of the resistance reduction device;

[0039] The components represented by the reference numerals in the figure are:

[0040] 1. Oil-immersed transformer; 2. Grounding wire; 3. Grounding electrode; 4. Rainwater collection pool; 5. Conductive material chamber; 6. Liquid dispensing pipe; 61. Liquid outlet; 7. Pipeline; 8. First automatic discharge valve; 9. Second automatic discharge valve; 10. Leakage hole; 101. Center hole; 102. Through hole; 11. First stirring shaft; 12. First stirring blade; 13. First windmill; 14. Bearing; 15. Second stirring shaft; 16. Second stirring blade; 17. Second windmill; 18. Driving motor; 19. Solar panel; 20. Flat filter; 21. Curved filter; 22. Soil monitoring unit. DETAILED DESCRIPTION

[0041] See also Figure 1 , Figure 3 , Figure 4 and Figure 5A grounding resistance reduction device for an oil-immersed transformer is shown, which is arranged on one side of the body of the oil-immersed transformer 1. A grounding wire 2 is provided on the oil-immersed transformer, and the grounding wire 2 is connected to a grounding electrode 3 inserted into the ground. A resistance reduction device is provided directly above the grounding electrode 3. The resistance reduction device includes a rainwater collection pool 4 located on the ground, a conductive material chamber 5 arranged therein, and a plurality of liquid distribution pipes 6 connected to the rainwater collection pool 4. In this embodiment, four liquid distribution pipes 6 arranged in a matrix are arranged around the grounding electrode 3. The liquid distribution pipes 6 are inserted underground, and a plurality of liquid outlet holes 61 facing the grounding electrode 3 are opened on the liquid distribution pipes 6. A soil monitoring unit 22 is provided at the lower part of a single liquid distribution pipe 6. The number and position of the soil monitoring units 22 are set according to actual conditions. The soil monitoring unit 22 can monitor parameters such as soil conductivity and humidity.

[0042] Among them, the lower part of the rainwater collection pool 4 is an arc-shaped bottom, and a first automatic discharge valve 8 is provided below the arc-shaped bottom. The first automatic discharge valve 8 can be opened or closed to discharge rainwater or conductive solution in the rainwater collection pool 4. A water level monitoring unit is provided in the rainwater collection pool 4. The water level monitoring unit is used to monitor the water level of the water in the rainwater collection pool 4. The first automatic discharge valve 8 has a liquid outlet located at the lower part, and the upper parts of multiple liquid dispensing tubes 6 are connected to the liquid outlet through pipes 7. Multiple pipes 7 are provided, which are corresponding to the liquid dispensing tubes 6. One end of the pipe 7 is sealed and connected to the liquid outlet, and the other end is connected to the upper part of the corresponding liquid dispensing tube 6.

[0043] See also Figure 2 As shown, the conductive material chamber 5 is located at the upper part of the inner side of the rainwater collection pool 4, and a second automatic discharge valve 9 is provided at the lower part of the conductive material chamber 5. The discharge of the conductive material in the conductive material chamber 5 is controlled by the second automatic discharge valve 9. A leakage hole 10 is opened on one side of the rainwater collection pool 4 and is located below the discharge port of the second automatic discharge valve 9. The leakage hole 10 includes a central hole 101 and a plurality of through holes 102 connected along its periphery. The first stirring shaft 11 is connected to the central hole 101 through a bearing 14 sleeved thereon. The bearing 14 is a waterproof bearing. The first stirring shaft 11 is fixedly connected to the inner ring of the bearing 14, and the outer ring of the bearing 14 is fixedly connected to the inner wall 101 of the central hole. The plurality of through holes 102 can discharge the excessive rainwater collected by the rainwater collection pool 4 to prevent rainwater from flooding the discharge port of the second automatic discharge valve 9 and reduce the phenomenon that rainwater enters the conductive material chamber 5 and causes the conductive material to become damp.

[0044] See also Figure 5As shown, a filtering assembly is provided on the upper part of the rainwater collection pool 4, and a stirring assembly is provided inside. The stirring assembly includes a first stirring shaft 11 and a first stirring blade 12 arranged thereon. The first stirring shaft 11 passes through the leakage hole 10 in the horizontal direction and is rotatably connected to the rainwater collection pool 4. One end of the first stirring shaft 11 extends to the outside of the rainwater collection pool 4, and a first stirring shaft driving member is provided thereon. The first stirring shaft driving member can be a first windmill 13, which drives the first stirring shaft 11 and the first stirring blade 12 to rotate by external wind force, so as to stir and mix rainwater and conductive materials.

[0045] The speed, time and duration of the rotation of the first windmill 13 by wind energy are uncontrollable. In order to improve the first stirring shaft 11 to drive the first stirring blade 12 to rotate normally when the conductive material and rainwater need to be stirred, a driving motor 18 is provided at one end of the first stirring shaft 11 away from the first windmill 13. The driving motor 18 has a rotating shaft, which is connected to the first stirring shaft 11 through a connector, and the driving motor 18 can drive the first stirring shaft 11 to rotate. The driving motor 18 is electrically connected to a plurality of solar panels 19 arranged outside the rainwater collection pool 4, and the driving motor 18 is electrically connected to the control module. The solar panels 19 can convert solar energy into electrical energy, and store it through an external battery connected thereto, and then convert direct current into alternating current that can be used by the driving motor 18 through an external power conversion device (such as an inverter).

[0046] It should be noted that when the drive motor 18 is not in operation, the rotating shaft of the drive motor 18 can be driven to rotate by the first windmill 13. The first windmill 13 can utilize wind energy to rotate, so that the first windmill 13 can drive the first stirring blade 12 to rotate, and the rainwater collected in the rainwater collection pool 4 can be stirred at irregular intervals, so that the suspended matter or particles in the rainwater can be suspended in the rainwater, thereby preventing particles from accumulating at the bottom of the rainwater collection pool 4 and affecting the liquid discharge of the first automatic discharge valve 8.

[0047] The soil monitoring unit 22, the water level monitoring unit, the first automatic discharge valve 8, the second automatic discharge valve 9 and the driving motor 18 are electrically connected to an external control module respectively.

[0048] The conductive material chamber 5 is filled with conductive material in the form of solid particles, which may form lumps if placed in the conductive material chamber 5 for a long time. In order to prevent the agglomerated conductive material from flowing out of the discharge port smoothly, a second stirring shaft 15 parallel to the first stirring shaft 11 is provided in the conductive material chamber 5 for rotation. The second stirring shaft 15 is provided with a second stirring blade 16. The second stirring shaft 15 passes through the conductive material chamber 5 and the rainwater collection pool 4, and is connected to a second stirring shaft driving member outside the rainwater collection pool 4. The second stirring shaft driving member may be a second windmill 17, which can rotate under the drive of wind all day long, and then the second stirring blade 16 is driven to rotate through the second stirring shaft 15, thereby breaking up the conductive material in the form of solid particles.

[0049] In order to reduce the mutual interference between the first stirring shaft driving member and the second stirring shaft driving member during rotation, the first stirring shaft driving member and the second stirring shaft driving member are arranged in an up-and-down staggered manner. The first stirring shaft driving member includes a first windmill 13 , and the second stirring shaft driving member includes a second windmill 17 .

[0050] Since the force of stirring rainwater in the rainwater collection pool 4 is greater than the force of stirring the conductive material in the conductive material chamber 5, the length of the blade of the first windmill 13 is set to be greater than the length of the blade of the second windmill 17. The vertical spacing between the first windmill 13 and the second windmill 17 in the horizontal direction is greater than 2 times the length of the blade of the first windmill 13, which can reduce the interference between the rotation of the first windmill 13 and the second windmill 17. The first windmill 13 and the second windmill 17 use wind energy to drive the corresponding stirring shafts to rotate, which can reasonably use wind energy and play a role in energy saving and environmental protection.

[0051] Regarding the specific structure of the filter assembly, the filter assembly includes a flat filter 20 and an arc filter 21 located thereon. The flat filter 20 is arranged at the upper port of the rainwater collection pool 4. The mesh of the arc filter 21 is larger than the mesh of the flat filter 20. The arc filter 21 can filter external impurities to prevent more impurities and garbage from falling into the rainwater collection pool 4 and affecting the liquid output of the first automatic discharge valve 8. Moreover, its mesh size is relatively large and will not affect the rainwater falling into the rainwater collection pool 4.

[0052] A method for using a grounding resistance reduction device for an oil-immersed transformer 1 comprises the following steps:

[0053] S1. Drill multiple holes downward around the ground electrode 3, insert the liquid distribution pipe 6 with the soil monitoring unit 22 into the corresponding holes, and install the rainwater collection tank 4 on the ground;

[0054] S2, the soil monitoring unit 22 and the water level monitoring unit transmit the detected electrical signals to the control module respectively, and the control module converts the electrical signal transmitted by the soil monitoring unit 22 into a conductivity detection value, and converts the electrical signal detected by the water level monitoring unit into a water level detection value. If the conductivity detection value is greater than or equal to the set conductivity threshold, the first automatic discharge valve 8 and the second automatic discharge valve 9 do not operate;

[0055] S3, if the conductivity detection value is less than the set conductivity threshold, and the water level detection value is greater than the set water level threshold, the control module simultaneously sends a start signal to the second automatic discharge valve 9 and the drive motor 18 respectively, and the second automatic discharge valve 9 opens the discharge port according to the start signal, and the opening time is 10-30s. The opening time can be set according to the discharge amount of the second automatic discharge valve 9. At the same time, the first stirring shaft 11 drives the first stirring blade 12 to rotate and stir the rainwater and the conductive material released from the conductive material chamber 5;

[0056] S4, after the stirring assembly stirs for a set time, the control module sends a start signal to the first automatic discharge valve 8, and the first automatic discharge valve 8 opens the liquid outlet according to the start signal, and the opening time is 1-10 minutes, and the opening time can be set according to the liquid discharge volume of the first automatic discharge valve 8 per second;

[0057] S5, after the liquid outlet of the first automatic discharging valve 8 is closed, the control module sends a closing signal to the driving motor 18, and the driving motor 18 stops running according to the closing signal;

[0058] S6, the soil monitoring unit 22 continuously monitors the conductivity of the soil and regularly sends an electrical signal to the control module. If the conductivity detection value is less than the set conductivity threshold, S3 is executed;

[0059] If the conductivity detection value is greater than or equal to the set conductivity threshold, S2 is executed.

Claims

1. A grounding resistance reduction device for an oil-immersed transformer, arranged on one side of a body of the oil-immersed transformer (1), wherein the oil-immersed transformer is provided with a grounding wire (2), and the grounding wire (2) is connected to a grounding electrode (3) inserted into the ground, wherein: A resistance reduction device is provided directly above the grounding electrode (3), the resistance reduction device comprising a rainwater collection pool (4) located on the ground, a conductive material chamber (5) arranged therein, and a plurality of liquid distribution pipes (6) connected to the rainwater collection pool (4), the plurality of liquid distribution pipes (6) being inserted underground and located around the grounding electrode (3), the liquid distribution pipes (6) being provided with a plurality of liquid outlet holes (61) facing the grounding electrode (3), and a soil monitoring unit (22) being provided at the lower part of the liquid distribution pipes (6); The lower part of the rainwater collection pool (4) is provided with a first automatic discharge valve (8), in which a water level monitoring unit is provided, the lower part of the first automatic discharge valve (8) has a liquid outlet, and the upper parts of the plurality of liquid distribution pipes (6) are all connected to the liquid outlet; The conductive material chamber (5) is located at the upper part of the inner side of the rainwater collection pool (4), a second automatic discharge valve (9) is provided at the lower part of the conductive material chamber (5), and a leakage hole (10) located below the discharge port of the second automatic discharge valve (9) is opened on one side of the rainwater collection pool (4); The rainwater collection pool (4) is provided with a filter assembly at the top and a stirring assembly inside, the stirring assembly comprising a first stirring shaft (11) and a first stirring blade (12) arranged thereon, the first stirring shaft (11) passing through the drain hole (10) in the horizontal direction and being rotatably connected to the rainwater collection pool (4), one end of the first stirring shaft (11) extending to the outside of the rainwater collection pool (4) and being provided with a first stirring shaft driving member; The soil monitoring unit (22), the first automatic discharge valve (8) and the second automatic discharge valve (9) are electrically connected to an external control module respectively.

2. The grounding resistance reduction device for an oil-immersed transformer according to claim 1, characterized in that: A second stirring shaft (15) parallel to the first stirring shaft (11) is rotatably arranged in the conductive material chamber (5), and a second stirring blade (16) is arranged on the second stirring shaft (15). The second stirring shaft (15) passes through the conductive material chamber (5) and the rainwater collection pool (4), and is connected to a second stirring shaft driving member outside the rainwater collection pool (4).

3. The grounding resistance reduction device for an oil-immersed transformer according to claim 1, characterized in that: The leakage hole (10) comprises a central hole (101) and a plurality of through holes (102) arranged in communication along its outer circumference, and the first stirring shaft (11) is connected to the central hole (101) via a bearing (14) sleeved thereon.

4. The grounding resistance reduction device for an oil-immersed transformer according to claim 1, characterized in that: The first stirring shaft driving member and the second stirring shaft driving member are arranged alternately up and down.

5. The grounding resistance reduction device for an oil-immersed transformer according to claim 4, characterized in that: The first stirring shaft driving component comprises a first windmill (13), and the second stirring shaft driving component comprises a second windmill (17). The blade length of the first windmill (13) is greater than the blade length of the second windmill (17), and the vertical spacing between the first windmill (13) and the second windmill (17) in the horizontal direction is greater than twice the blade length of the first windmill (13).

6. The grounding resistance reduction device for an oil-immersed transformer according to claim 5, characterized in that: A drive motor (18) is provided at one end of the first stirring shaft (11) away from the first windmill (13); the drive motor (18) is electrically connected to a plurality of solar panels (19) arranged outside the rainwater collection tank (4); and the drive motor (18) is electrically connected to a control module.

7. The grounding resistance reduction device for an oil-immersed transformer according to claim 1, characterized in that: The filter assembly comprises a flat filter screen (20) and a curved filter screen (21) located thereon, the flat filter screen (20) being arranged at the upper port of the rainwater collection pool (4), and the mesh size of the curved filter screen (21) being larger than the mesh size of the flat filter screen (20).

8. A method for using a grounding resistance reduction device for an oil-immersed transformer according to any one of claims 1 to 7, characterized in that: The steps include: S1. Drill a plurality of boreholes downward around the grounding electrode (3), insert a liquid distribution pipe (6) with a soil monitoring unit (22) into the corresponding boreholes, and install a rainwater collection tank (4) on the ground; S2, the soil monitoring unit (22) and the water level monitoring unit respectively transmit the detected electrical signals to the control module, the control module converts the electrical signal transmitted by the soil monitoring unit (22) into a conductivity detection value, and converts the electrical signal detected by the water level monitoring unit into a water level detection value. If the conductivity detection value is greater than or equal to a set conductivity threshold value, the first automatic discharge valve (8) and the second automatic discharge valve (9) do not operate; S3, if the conductivity detection value is less than the set conductivity threshold value, and the water level detection value is greater than the set water level threshold value, the control module simultaneously sends a start signal to the second automatic discharge valve (9) and the drive motor (18) respectively, and the second automatic discharge valve (9) opens the discharge port according to the start signal, and the opening time is 10-30s. At the same time, the first stirring shaft (11) drives the first stirring blade (12) to rotate and stir the rainwater and the conductive material discharged from the conductive material chamber (5); S4, after the stirring component stirs for a set time, the control module sends a start signal to the first automatic discharge valve (8), and the first automatic discharge valve (8) opens the liquid outlet according to the start signal, and the opening time is 1-10 minutes; S5, after the liquid outlet of the first automatic discharge valve (8) is closed, the control module sends a closing signal to the drive motor (18), and the drive motor (18) stops running according to the closing signal; S6, the soil monitoring unit (22) continuously monitors the conductivity of the soil and regularly sends an electrical signal to the control module. If the conductivity detection value is less than the set conductivity threshold, S3 is executed; If the conductivity detection value is greater than or equal to the set conductivity threshold, S2 is executed.

Images