Flexible control voltage type grounding compensation mode and control method

Abstract

The invention discloses a flexible control voltage type grounding compensation mode and a control method, S1, firstly, a connecting terminal and an external grounding circuit are installed and communicated, so that an arc suppression coil is connected to the grounding circuit, and S2, then, a cooling pump is started, cooling liquid in a cooling liquid pipe and a liquid return pipe circulates, so that the arc suppression coil is connected to the grounding circuit. S3, starting a fan to suck external cold air into the inner side of the mounting box body, and cooling the cooling liquid in the cooling liquid pipe and the liquid return pipe, the structure is scientific and reasonable, the use is safe and convenient, the cooling liquid in the cooling liquid pipe and the liquid return pipe is circulated, the cooling effect is good, and the cooling effect is good. At the moment, a large amount of heat generated by working of the iron core cylinder and the arc suppression coil can be taken away, heat dissipation is conducted on the arc suppression coil, the arc suppression coil is prevented from being damaged due to overheating in the using process, the service life of the arc suppression coil is prolonged, and meanwhile grounding compensation can be stably conducted.

Description

Technical Field

[0001] The present invention relates to the technical field of grounding compensation, and in particular to a flexible control voltage type grounding compensation mode and a control method. Background Art

[0002] The grounding compensation device generally uses arc extinguishing. The arc extinguishing coil is an inductive coil with an iron core. It is connected between the neutral point of the transformer and the earth to form an arc extinguishing coil grounding system. During normal operation, no current flows through the arc extinguishing coil. When the power grid is struck by lightning or single-phase arc grounding occurs, the neutral point potential will rise to the phase voltage. At this time, the inductive current flowing through the arc extinguishing coil and the capacitive fault current of the single-phase grounding offset each other, so that the grounding fault can be quickly eliminated without causing overvoltage.

[0003] However, the existing arc extinguishing coil will generate a large amount of heat when in use, and the traditional heat dissipation device can only dissipate heat from the outside, with poor heat dissipation effect and low efficiency, which makes it easy to burn the coil during arc extinguishing and has a short service life. In order to avoid the above technical problems, it is indeed necessary to provide a flexible controlled voltage type grounding compensation method and control method to overcome the above defects in the prior art. Summary of the invention

[0004] The present invention provides a flexible controlled voltage type grounding compensation method and control method, which can effectively solve the problem that the existing arc extinguishing coil proposed in the above background technology will generate a large amount of heat when in use, and the traditional heat dissipation device can only dissipate heat from the outside, with poor heat dissipation effect and low efficiency, which leads to the coil being easily burned out during arc extinguishing and having a short service life.

[0005] To achieve the above object, the present invention provides the following technical solution: a flexible control voltage type grounding compensation method, comprising the following steps;

[0006] S1. First, install and connect the connection terminal to the external grounding circuit, so as to connect the arc suppression coil to the grounding circuit;

[0007] S2. Then, the cooling pump is turned on to circulate the coolant in the coolant pipe and the return pipe, which can take away a large amount of heat generated by the core tube and the arc extinguishing coil;

[0008] S3, then, turn on the fan to suck the external cold air into the inner side of the installation box to cool the coolant in the coolant pipe and the return pipe;

[0009] S4, then, the fan is turned on so that the internal air of the installation box can flow, and then the drawn air is discharged from the air guide cover to the outside of the installation box;

[0010] S5. Finally, a certain amount of humid gas will be generated inside the installation box. At this time, the humid gas will pass through the moisture absorption groove and enter the inner side of the silicone grease drying box to be adsorbed.

[0011] Preferably, a heat dissipation component is installed on the inner side of the installation box;

[0012] The heat dissipation assembly includes a mounting plate, an iron core tube, a connecting terminal, an arc extinguishing coil, a heat soaking tube, a cooling column tube, a liquid inlet pipe, a solenoid valve, an external heat dissipation pipe, a return loop pipe, an insulating base, a heat soaking outer sleeve, a coolant pipe, a liquid return pipe, a cooling pump, a water absorption filter element, a connecting rod, a magnetic suction sheet, a water baffle and a sealing door panel;

[0013] A mounting plate is mounted on the inner side of the mounting box, an iron core tube is mounted on the bottom end of the mounting plate, a connecting terminal is mounted on the top end of the mounting plate, an arc extinguishing coil is sleeved on the outer side of the iron core tube, a heat-saturating tube is embedded on the inner side of the iron core tube, a cooling column is embedded on the inner side of the heat-saturating tube, a liquid inlet pipe is connected to the top end of the cooling column, and a solenoid valve is mounted on the outer side of the liquid inlet pipe;

[0014] An external heat dissipation pipe is connected to the bottom of the outer side of the cooling column, a return loop pipe is sleeved on the top of the outer side of the arc extinguishing coil, an insulating base is clamped on the bottom end of the external heat dissipation pipe, and a heat-averaging outer sleeve is sleeved on the outer side of the arc extinguishing coil;

[0015] The top of the liquid inlet pipe is connected with a coolant pipe, the outer side of the reflux ring pipe is connected with a return liquid pipe, a cooling pump is installed at the inner bottom of the installation box, and a water absorption filter element is clamped on the inner top of the installation box.

[0016] Preferably, a connecting rod is welded to the top of the outer side of the installation box, a magnetic sheet is welded to the top of the connecting rod, a water baffle is adsorbed to the top of the magnetic sheet, and a sealing door panel is installed on the front of the installation box.

[0017] Preferably, the outer diameter of the heat-saturating cylinder is equal to the inner diameter of the iron core cylinder, and the liquid inlet pipe is connected to the inner chamber of the cooling column cylinder.

[0018] Preferably, a plurality of external heat dissipation pipes are provided, and the plurality of external heat dissipation pipes are connected at equal angles to the outer bottom of the cooling column.

[0019] Preferably, a clamping groove is provided at a position corresponding to the external heat dissipation tube on the insulating base, and a heat-dissipating groove is provided at a position corresponding to the external heat dissipation tube on the outer side of the heat-dissipating outer sleeve.

[0020] Preferably, the liquid outlet end of the liquid return pipe is connected to the liquid inlet end of the cooling pump, and one end of the cooling liquid pipe is connected to the liquid outlet end of the cooling pump.

[0021] Preferably, the input end of the arc extinguishing coil is connected to the output end of the connecting terminal, and the input ends of the solenoid valve and the cooling pump are electrically connected to the output end of the external power supply.

[0022] Preferably, a moisture absorbing component is installed at the bottom end of the installation box;

[0023] The moisture absorption component includes a moisture absorption box, a clamping chamber, a silicone grease drying box, a fixing plate, a moisture absorption slot, a ventilation slot, a mounting slot plate, a fan, a waterproof slot plate, an air guide cover and a bottom filter element;

[0024] A moisture absorption box is welded to the front end face of the sealing door panel, a card connection chamber is provided on the inner side of the moisture absorption box card, a silicone grease drying box is embedded on the inner side of the card connection chamber, a fixing plate is welded to one end face of the silicone grease drying box, a moisture absorption groove is provided on the inner side of the fixing plate, a ventilation groove is penetrated through the bottom end of the installation box, a mounting groove plate is installed at the bottom end of the installation box, a fan is installed on the inner side of the mounting groove plate, a waterproof groove plate is sleeved on the outer side of the installation groove plate, an air guide cover is welded to the bottom end of the waterproof groove plate, and a bottom filter element is installed at the bottom end of the air guide cover.

[0025] A flexible control voltage type grounding control method, the control method is composed of the following formula:

[0026] V g =V set +k·ΔI f +R e I f

[0027] Where V g : The target voltage of the grounding system, the target value to which the flexible control device needs to adjust the grounding voltage;

[0028] V set : The preset reference ground voltage is the reference value of the ground voltage set according to the normal operating conditions of the power system;

[0029] k: gain adjustment coefficient, used to adjust the dynamic response characteristics of the flexible control system. This coefficient can be adjusted according to system requirements and is usually related to the sensitivity of the control system;

[0030] ΔI f : Fault current change, defined as ΔI f =I f -I set ,in:

[0031] I f : Current ground fault current;

[0032] I set : preset fault current reference value;

[0033] When the fault current increases, it is necessary to reduce the impact of the fault current by adjusting the grounding voltage;

[0034] R e : Dynamic ground impedance, equivalent ground impedance adjusted by flexible control equipment, used to suppress ground current;

[0035] I f : The current ground fault current is determined by the characteristics of the fault point and is measured in real time by the system;

[0036] in:

[0037] Basic voltage regulation: V g =V set Indicates that under normal operating conditions, the ground voltage is the reference voltage;

[0038] Fault dynamic response: When a ground fault occurs, the ground voltage will dynamically respond to the change in fault current ΔI f , by adjusting k·ΔI f Achieve rapid suppression;

[0039] Impedance compensation: R e I f Some of them are used to simulate the dynamic adjustment of ground impedance, so as to further optimize the fault current distribution and avoid excessive current damaging the system.

[0040] Compared with the prior art, the present invention has the following beneficial effects: the present invention has a scientific and reasonable structure and is safe and convenient to use:

[0041] 1. A heat dissipation component is provided. By installing and connecting the connecting terminal with the external grounding circuit, the arc extinguishing coil is connected to the grounding circuit, so that the arc extinguishing work can be carried out conveniently and quickly. Then the cooling pump is turned on to circulate the coolant inside the coolant pipe and the return pipe. At this time, a large amount of heat generated by the core tube and the arc extinguishing coil can be taken away to dissipate the heat of the arc extinguishing coil, so as to prevent the arc extinguishing coil from being overheated and damaged during use. While extending the working life of the arc extinguishing coil, the grounding compensation can be carried out stably to further protect the circuit in use. Then the fan is turned on to suck the external cold air into the inside of the installation box to cool the coolant inside the coolant pipe and the return pipe to ensure the cooling effect.

[0042] 2. A desiccant component is provided. The moist gas will pass through the desiccant groove and enter the inner side of the silicone grease drying box and be adsorbed, thereby ensuring the dryness of the inside of the installation box and preventing the moist air from rusting the arc extinguishing coil, further ensuring the service life of the arc extinguishing coil. Then turn on the fan to allow the internal air of the installation box to flow, thereby quickly drying the inside of the installation box and improving the drying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0044] Figure 1 is a schematic diagram of the control method of the present invention;

[0045] Figure 2 It is a schematic diagram of the structure of the present invention;

[0046] Figure 3 It is a structural schematic diagram of the heat dissipation assembly of the present invention;

[0047] Figure 4 It is a schematic diagram of the installation structure of the arc suppression coil of the present invention;

[0048] Figure 5 It is a schematic diagram of the installation structure of the heat soaking cylinder of the present invention;

[0049] Figure 6 It is a schematic diagram of the installation structure of the water retaining plate of the present invention;

[0050] Figure 7 It is a schematic diagram of the structure of the moisture absorption component of the present invention;

[0051] Figure 8 It is a schematic diagram of the installation structure of the bottom filter element of the present invention;

[0052] Numbers in the figure: 1. Install the box;

[0053] 2. Heat dissipation assembly; 201. Mounting plate; 202. Iron core tube; 203. Connecting terminal; 204. Arc extinguishing coil; 205. Heat soaking tube; 206. Cooling column tube; 207. Liquid inlet pipe; 208. Solenoid valve; 209. External heat dissipation tube; 210. Return loop tube; 211. Insulating base; 212. Heat soaking outer sleeve; 213. Cooling liquid pipe; 214. Return liquid pipe; 215. Cooling pump; 216. Water absorption filter element; 217. Connecting rod; 218. Magnetic sheet; 219. Water baffle; 220. Sealing door panel;

[0054] 3. Desiccant assembly; 301. Desiccant box; 302. Snap-on chamber; 303. Silicone grease drying box; 304. Fixing plate; 305. Desiccant groove; 306. Ventilation groove; 307. Mounting groove plate; 308. Fan; 309. Waterproof groove plate; 310. Air guide cover; 311. Bottom filter element. DETAILED DESCRIPTION

[0055] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0056] Example: Figure 1-8 As shown, the present invention provides a technical solution, a flexible control voltage type grounding compensation method; comprising the following steps;

[0057] S1. First, the connection terminal 203 is installed and connected to the external grounding circuit, so that the arc extinguishing coil 204 is connected to the grounding circuit;

[0058] S2. Subsequently, the cooling pump 215 is turned on to circulate the cooling liquid inside the cooling liquid pipe 213 and the return liquid pipe 214, thereby taking away a large amount of heat generated by the core tube 202 and the arc extinguishing coil 204;

[0059] S3, then, turn on the fan 308 to draw external cold air into the inner side of the installation box 1, and cool the coolant inside the coolant pipe 213 and the return pipe 214;

[0060] S4, then, the fan 308 is turned on so that the air inside the installation box 1 can flow, and then the drawn air is discharged from the air guide cover 310 to the outside of the installation box 1;

[0061] S5. Finally, a certain amount of humid gas will be generated inside the installation box 1. At this time, the humid gas will pass through the moisture absorption groove 305 and enter the inner side of the silicone grease drying box 303 to be adsorbed.

[0062] A heat dissipation component 2 is installed inside the installation box 1;

[0063] The heat dissipation assembly 2 includes a mounting plate 201, an iron core tube 202, a connecting terminal 203, an arc extinguishing coil 204, a heat-saturating tube 205, a cooling column tube 206, a liquid inlet pipe 207, a solenoid valve 208, an external heat dissipation pipe 209, a return loop pipe 210, an insulating base 211, a heat-saturating outer sleeve 212, a coolant pipe 213, a return pipe 214, a cooling pump 215, a water absorption filter element 216, a connecting rod 217, a magnetic suction sheet 218, a water baffle 219 and a sealing door plate 220;

[0064] A mounting plate 201 is mounted on the inner side of the mounting box 1, an iron core tube 202 is mounted on the bottom end of the mounting plate 201, a connecting terminal 203 is mounted on the top end of the mounting plate 201, an arc extinguishing coil 204 is sleeved on the outer side of the iron core tube 202, a heat equalizing tube 205 is embedded on the inner side of the iron core tube 202, a cooling column 206 is embedded on the inner side of the heat equalizing tube 205, a liquid inlet pipe 207 is connected to the top end of the cooling column 206, the outer diameter of the heat equalizing tube 205 is equal to the inner diameter of the iron core tube 202, the liquid inlet pipe 207 is connected to the inner chamber of the cooling column 206, which is conducive to rapid heat dissipation, and a solenoid valve 208 is mounted on the outer side of the liquid inlet pipe 207;

[0065] An external heat dissipation pipe 209 is connected to the bottom of the outer side of the cooling column 206. There are several external heat dissipation pipes 209, which are connected at equal angles to the bottom of the outer side of the cooling column 206 to facilitate the reflux of the coolant. A return ring pipe 210 is sleeved at the top of the outer side of the arc extinguishing coil 204. An insulating base 211 is clamped at the bottom end of the external heat dissipation pipe 209. A heat-averaging outer sleeve 212 is sleeved on the outer side of the arc extinguishing coil 204. A clamping groove is provided at the corresponding position of the insulating base 211 and the external heat dissipation pipe 209. A heat-averaging groove is provided on the outer side of the heat-averaging outer sleeve 212 and at the corresponding position of the external heat dissipation pipe 209, which is conducive to heat transfer.

[0066] The top of the liquid inlet pipe 207 is connected to the cooling liquid pipe 213, the outer side of the reflux loop pipe 210 is connected to the return liquid pipe 214, a cooling pump 215 is installed at the inner bottom of the installation box 1, the liquid outlet end of the return liquid pipe 214 is connected to the liquid inlet end of the cooling pump 215, and one end of the cooling liquid pipe 213 is connected to the liquid outlet end of the cooling pump 215 for convenient cooling, and a water absorption filter element 216 is clamped on the inner top of the installation box 1.

[0067] A connecting rod 217 is welded to the top of the outer side of the installation box 1, a magnetic sheet 218 is welded to the top of the connecting rod 217, a water baffle 219 is adsorbed to the top of the magnetic sheet 218, a sealing door panel 220 is installed on the front of the installation box 1, the input end of the arc extinguishing coil 204 is connected to the output end of the connecting terminal 203, and the input end of the solenoid valve 208 and the cooling pump 215 are electrically connected to the output end of the external power supply.

[0068] A moisture absorbing component 3 is installed at the bottom end of the installation box 1;

[0069] The moisture absorption component 3 includes a moisture absorption box 301, a clamping chamber 302, a silicone grease drying box 303, a fixing plate 304, a moisture absorption slot 305, a ventilation slot 306, a mounting slot plate 307, a fan 308, a waterproof slot plate 309, an air guide cover 310 and a bottom filter element 311;

[0070] A desiccant box 301 is welded to the front end face of the sealing door panel 220, a card-connecting chamber 302 is provided on the inner side of the card-connecting chamber 302, a silicone grease drying box 303 is embedded in the inner side of the card-connecting chamber 302, a fixing plate 304 is welded to one end face of the silicone grease drying box 303, a desiccant groove 305 is provided on the inner side of the fixing plate 304, a ventilation groove 306 is penetrated through the bottom end of the installation box 1, a mounting groove plate 307 is installed at the bottom end of the installation box 1, a fan 308 is installed on the inner side of the mounting groove plate 307, a waterproof groove plate 309 is sleeved on the outer side of the installation groove plate 307, an air guide cover 310 is welded to the bottom end of the waterproof groove plate 309, and a bottom filter element 311 is installed at the bottom end of the air guide cover 310.

[0071] A flexible control voltage type grounding control method, the control method is composed of the following formula:

[0072] V g =V set +k·ΔI f +R e I f

[0073] Where V g : The target voltage of the grounding system, the target value to which the flexible control device needs to adjust the grounding voltage;

[0074] V set : The preset reference ground voltage is the reference value of the ground voltage set according to the normal operating conditions of the power system;

[0075] k: gain adjustment coefficient, used to adjust the dynamic response characteristics of the flexible control system. This coefficient can be adjusted according to system requirements and is usually related to the sensitivity of the control system;

[0076] ΔI f : Fault current change, defined as ΔI f =I f -I set ,in:

[0077] I f : Current ground fault current;

[0078] I set : preset fault current reference value;

[0079] When the fault current increases, it is necessary to reduce the impact of the fault current by adjusting the grounding voltage;

[0080] R e : Dynamic ground impedance, equivalent ground impedance adjusted by flexible control equipment, used to suppress ground current;

[0081] I f : The current ground fault current is determined by the characteristics of the fault point and is measured in real time by the system;

[0082] in:

[0083] Basic voltage regulation: V g =V set Indicates that under normal operating conditions, the ground voltage is the reference voltage;

[0084] Fault dynamic response: When a ground fault occurs, the ground voltage will dynamically respond to the change in fault current ΔI f , by adjusting k·ΔI f Achieve rapid suppression;

[0085] Impedance compensation: R e If Some of them are used to simulate the dynamic adjustment of ground impedance, so as to further optimize the fault current distribution and avoid excessive current damaging the system.

[0086] The working principle and use process of the present invention are as follows: First, the connection terminal 203 is connected to the circuit that needs to be grounded through an external cable. When the circuit needs to be grounded, the arc extinguishing coil 204 will generate a large amount of heat. At this time, the cooling pump 215 is turned on to draw back the coolant inside the return loop 210 through the return pipe 214, and when the coolant inside the inlet pipe 207 starts to flow, the coolant inside the cooling column 206 will flow from the top of the cooling column 206 to the bottom of the cooling column 206, and then flow from the bottom of the cooling column 206 to the inside of the external heat dissipation pipe 209. At this time, a large amount of heat inside the core tube 202 will be transferred to the heat equalizing tube 205, and then the heat will be transferred to the internal cooling column 206, and then the heat will be transferred to the internal coolant;

[0087] At the same time, the heat will be carried by the coolant to flow to the inside of the outer heat dissipation pipe 209, and the large amount of heat generated by the arc extinguishing coil 204 will be transferred to the inside of the heat-equalizing outer sleeve 212, and then the heat generated will be transferred from the heat-equalizing outer sleeve 212 to the inside of the outer heat dissipation pipe 209, and then the heat will be transferred from the outer heat dissipation pipe 209 to the internal coolant, and then after the coolant is pumped, a large amount of heat will be dissipated from the return pipe 214 to the inside of the installation box 1, and the cooling pump 215 will continue to dissipate the heat to the air inside the installation box 1 while transporting the coolant from the coolant pipe 213 to the cooling column 206;

[0088] And because the installation box 1 is connected to the external air through the water absorption filter 216 on the top, a large amount of heat will be dissipated to the external air through the water absorption filter 216, or the fan 308 is turned on to draw the external cold air into the interior of the installation box 1. At this time, when the cold air passes through the water absorption filter 216, the internal moisture will be absorbed, and then the cold air will pass through the interior of the installation box 1 and be discharged to the outside. The cold air will continue to cool the cooling liquid pipe 213 and the return liquid pipe 214, and then the coolant will continue to cool the core tube 202 and the arc extinguishing coil 204;

[0089] By installing and connecting the connecting terminal 203 with the external grounding circuit, the arc extinguishing coil 204 is connected to the grounding circuit, so that the arc extinguishing work can be carried out conveniently and quickly, and then the cooling pump 215 is turned on to circulate the coolant inside the coolant pipe 213 and the return pipe 214. At this time, a large amount of heat generated by the core tube 202 and the arc extinguishing coil 204 can be taken away, and the arc extinguishing coil 204 is cooled to prevent the arc extinguishing coil 204 from being damaged by overheating during use. While extending the working life of the arc extinguishing coil 204, the grounding compensation can be carried out stably to further protect the circuit in use, and then the fan 308 is turned on to suck the external cold air into the inner side of the installation box 1 to cool the coolant inside the coolant pipe 213 and the return pipe 214 to ensure the cooling effect;

[0090] Finally, during use, when the temperature difference between day and night is large, a certain amount of humid gas will be generated inside the installation box 1. At this time, the humid gas will pass through the moisture absorption groove 305 and enter the inner side of the silicone grease drying box 303 to be adsorbed, thereby ensuring the dryness of the inside of the installation box 1 and preventing the humid air from corroding the arc extinguishing coil 204, further ensuring the service life of the arc extinguishing coil 204, and then turn on the fan 308 to make the internal air of the installation box 1 flow, so as to quickly dry the inside of the installation box 1, and then the drawn air will be discharged from the air guide cover 310 to the outside of the installation box 1, and after a period of use, the sealing door panel 220 can be opened and the operator can then extract the silicone grease drying box 303 from the clamping chamber 302 on the inside of the moisture absorption box 301, so that the desiccant inside the silicone grease drying box 303 can be replaced, further ensuring the drying efficiency.

[0091] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flexible controlled voltage type grounding compensation method, characterized by: The method comprises the following steps: S1. First, the connection terminal (203) is installed and connected to the external grounding circuit, so that the arc extinguishing coil (204) is connected to the grounding circuit; S2. Subsequently, the cooling pump (215) is turned on to circulate the cooling liquid inside the cooling liquid pipe (213) and the return liquid pipe (214), thereby taking away a large amount of heat generated by the operation of the core tube (202) and the arc extinguishing coil (204); S3, then, turning on the fan (308) to draw external cold air into the inner side of the installation box (1), thereby cooling the coolant inside the coolant pipe (213) and the return pipe (214); S4, then, the fan (308) is turned on so that the air inside the installation box (1) can flow, and then the drawn air is discharged from the air guide cover (310) to the outside of the installation box (1); S5. Finally, a certain amount of humid gas will be generated inside the installation box (1). At this time, the humid gas will pass through the moisture absorption groove (305) and enter the inner side of the silicone grease drying box (303) to be adsorbed.

2. A flexible controlled voltage type grounding compensation method according to claim 1, characterized in that: A heat dissipation component (2) is installed on the inner side of the installation box (1); The heat dissipation assembly (2) comprises a mounting plate (201), an iron core tube (202), a connecting terminal (203), an arc extinguishing coil (204), a heat-saturating tube (205), a cooling column tube (206), a liquid inlet pipe (207), a solenoid valve (208), an external heat dissipation tube (209), a return loop tube (210), an insulating base (211), a heat-saturating outer sleeve (212), a coolant pipe (213), a liquid return pipe (214), a cooling pump (215), a water absorption filter element (216), a connecting rod (217), a magnetic suction sheet (218), a water baffle (219) and a sealing door plate (220); A mounting plate (201) is mounted on the inner side of the mounting box (1), an iron core tube (202) is mounted on the bottom end of the mounting plate (201), a connecting terminal (203) is mounted on the top end of the mounting plate (201), an arc extinguishing coil (204) is sleeved on the outer side of the iron core tube (202), a heat equalizing tube (205) is embedded on the inner side of the iron core tube (202), a cooling column tube (206) is embedded on the inner side of the heat equalizing tube (205), a liquid inlet pipe (207) is connected to the top end of the cooling column tube (206), and a solenoid valve (208) is mounted on the outer side of the liquid inlet pipe (207); An external heat dissipation pipe (209) is connected to the bottom of the outer side of the cooling column (206), a return loop pipe (210) is sleeved on the top of the outer side of the arc extinguishing coil (204), an insulating base (211) is clamped on the bottom end of the external heat dissipation pipe (209), and a heat-averaging outer sleeve (212) is sleeved on the outer side of the arc extinguishing coil (204); The top end of the liquid inlet pipe (207) is connected to a cooling liquid pipe (213), the outer side of the return loop pipe (210) is connected to a return liquid pipe (214), a cooling pump (215) is installed at the inner bottom of the installation box (1), and a water absorption filter element (216) is clamped at the inner top of the installation box (1).

3. A flexible controlled voltage type grounding compensation method according to claim 2, characterized in that: A connecting rod (217) is welded to the top of the outer side of the installation box (1), a magnetic sheet (218) is welded to the top of the connecting rod (217), a water baffle (219) is adsorbed to the top of the magnetic sheet (218), and a sealing door panel (220) is installed on the front of the installation box (1).

4. A flexible controlled voltage type grounding compensation method according to claim 2, characterized in that: The outer diameter of the heat-averaging cylinder (205) is equal to the inner diameter of the iron core cylinder (202), and the liquid inlet pipe (207) is connected to the inner chamber of the cooling column cylinder (206).

5. The flexible controlled voltage type grounding compensation method according to claim 2 is characterized in that: A plurality of external heat dissipation pipes (209) are provided, and the plurality of external heat dissipation pipes (209) are connected at equal angles to the outer bottom of the cooling column (206).

6. A flexible controlled voltage type grounding compensation method according to claim 2, characterized in that: A clamping groove is provided at a position corresponding to the position of the insulating base (211) and the external heat dissipation tube (209), and a heat dissipation groove is provided at a position corresponding to the position of the external heat dissipation tube (209) on the outer side of the heat dissipation outer sleeve (212).

7. A flexible controlled voltage type grounding compensation method according to claim 2, characterized in that: The liquid outlet end of the liquid return pipe (214) is connected to the liquid inlet end of the cooling pump (215), and one end of the cooling liquid pipe (213) is connected to the liquid outlet end of the cooling pump (215).

8. The flexible controlled voltage type grounding compensation method according to claim 2 is characterized in that: The input end of the arc extinguishing coil (204) is connected to the output end of the connecting terminal (203), and the input ends of the solenoid valve (208) and the cooling pump (215) are electrically connected to the output end of the external power supply.

9. A flexible controlled voltage type grounding compensation method according to claim 2, characterized in that: A moisture absorbing component (3) is installed at the bottom end of the installation box (1); The moisture absorption component (3) comprises a moisture absorption box (301), a clamping chamber (302), a silicone grease drying box (303), a fixing plate (304), a moisture absorption slot (305), a ventilation slot (306), a mounting slot plate (307), a fan (308), a waterproof slot plate (309), an air guide cover (310) and a bottom filter element (311); A moisture absorption box (301) is welded to the front end surface of the sealing door plate (220), a clamping chamber (302) is provided on the inner side of the clamping chamber (302), a silicone grease drying box (303) is embedded in the inner side of the clamping chamber (302), a fixing plate (304) is welded to one end surface of the silicone grease drying box (303), a moisture absorption groove (305) is provided on the inner side of the fixing plate (304), and the installation box (1) A ventilation slot (306) is provided through the bottom end of the installation box (1); a mounting slot plate (307) is installed at the bottom end of the installation box (1); a fan (308) is installed on the inner side of the mounting slot plate (307); a waterproof slot plate (309) is sleeved on the outer side of the mounting slot plate (307); an air guide cover (310) is welded to the bottom end of the waterproof slot plate (309); and a bottom filter element (311) is installed at the bottom end of the air guide cover (310).

10. A flexible control voltage type grounding control method, according to any one of claims 1 to 9, characterized in that: The control method is as follows: composition: V g =V set +k·ΔI f +R e ·I f Where V g : The target voltage of the grounding system, the target value to which the flexible control device needs to adjust the grounding voltage; V set : The preset reference ground voltage is the reference value of the ground voltage set according to the normal operating conditions of the power system; k: gain adjustment coefficient, used to adjust the dynamic response characteristics of the flexible control system. This coefficient can be adjusted according to system requirements and is usually related to the sensitivity of the control system; ΔI f : Fault current change, defined as ΔI f =I f -I set ,in: I f : Current ground fault current; I set : preset fault current reference value; When the fault current increases, it is necessary to reduce the impact of the fault current by adjusting the grounding voltage; R e : Dynamic ground impedance, equivalent ground impedance adjusted by flexible control equipment, used to suppress ground current; I f : The current ground fault current is determined by the characteristics of the fault point and is measured in real time by the system; in: Basic voltage regulation: V g =V set Indicates that under normal operating conditions, the ground voltage is the reference voltage; Fault dynamic response: When a ground fault occurs, the ground voltage will dynamically respond to the change in fault current ΔI f , by adjusting k·ΔI f Achieve rapid suppression; Impedance compensation: R e I f Some of them are used to simulate the dynamic adjustment of ground impedance, so as to further optimize the fault current distribution and avoid excessive current damaging the system.

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