Novel single-phase 400KV power transformer and use method thereof

Abstract

The invention discloses a novel single-phase 400KV power transformer and a using method thereof, and relates to the technical field of power transformers, the novel single-phase 400KV power transformer comprises a single-phase power transformer, the single-phase power transformer comprises an oil tank and a high-voltage bushing, and high-voltage side pieces are arranged on the two sides of the high-voltage bushing. During use, when the miniature gas chromatograph detects that the content of gas released in the insulating oil exceeds the standard, the oil pump is started, impurities in the insulating oil are removed through cooperation between the coarse filter plate and the fine filter plate, the insulating oil with the impurities filtered is conveyed into the negative pressure tank, the negative pressure pump is started, and the insulating oil is discharged from the negative pressure tank. The inside of the negative pressure tank is in a micro-negative pressure state, water escapes from the oil, impurities and water in the insulating oil are filtered, then the release amount of gas in the insulating oil is detected through the micro gas chromatograph, whether the transformer operates normally or not is judged, and the filtering assembly is matched with the cooling assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transformers, in particular to a novel single-phase 400KV power transformer and a use method thereof. BACKGROUND

[0002] The novel single-phase 400KV power transformer is a single-phase structure power conversion device adapted to a 400KV high-voltage power transmission and distribution network, and the core function is to convert 400KV high-voltage power and medium-low voltage power in both directions, and has the characteristics of high-voltage adaptation, energy efficiency optimization and structural innovation, is a key device for new energy grid connection and regional grid interconnection, and only contains a high-voltage winding, a low-voltage winding and a single-phase core, the magnetic circuit is a single path, and the structure is relatively compact, and transportation and installation are more convenient.

[0003] In the prior art, in the process of daily operation of the novel single-phase 400KV power transformer, in order to ensure the normal operation of the power transformer, the operation of the power transformer is usually judged by directly extracting insulating oil and detecting whether the content of released gas in the insulating oil is normal, but in the process of operation of the transformer, the sudden increase of gas is also easy to be caused by slight dampening, oxidation or impurities mixed into the insulating oil, and is not caused by damage of the winding, the core and other core components, and only relying on a single index to determine damage will misclassify normal condition fluctuations as equipment failure, increase invalid operation and maintenance, and thus affect the normal operation of the power transformer.

[0004] Therefore, the present application provides a novel single-phase 400KV power transformer and a use method thereof to solve the problems in the above background. SUMMARY

[0005] The present application aims to provide a novel single-phase 400KV power transformer and a use method thereof to solve the problem that most power transformers are easy to increase invalid operation and maintenance and affect the normal operation of the power transformer by simply extracting insulating oil to detect the amount of released gas to judge the operation state of the transformer.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a novel single-phase KV power transformer, comprising a single-phase power transformer, the single-phase power transformer comprising an oil tank and a high-voltage bushing, both sides of the high-voltage bushing are provided with high-voltage side sheets, the outer surface of the oil tank is provided with a filter assembly, the filter assembly comprises an oil outlet pipe and a treatment cavity, two filter tanks are fixedly communicated at the bottom of the treatment cavity, a coarse filter plate is fixedly installed on the inner wall of each filter tank close to the top, a fine filter plate is fixedly installed on the inner wall of each filter tank close to the bottom, and a negative pressure tank is fixedly communicated between the bottom ends of the two filter tanks, a negative pressure pump is fixedly installed on the outer surface of the negative pressure tank through screws, the gas outlet end of the negative pressure pump is fixedly communicated with a conveying pipe, and the bottom end of the conveying pipe is fixedly communicated with a water storage tank.

[0007] Preferably, the filter assembly further comprises an oil pump, and the inlet end of the oil pump is fixedly connected with an oil inlet pipe.

[0008] Preferably, an intelligent switch valve is arranged on the outer surface of each of the two filter tanks near the top, and a one-way valve is arranged on the outer surface of each of the two filter tanks near the bottom.

[0009] Preferably, a cooling assembly is arranged on the outer surface of the filter assembly, the cooling assembly comprises a cooling pipe, a condensing sleeve is fixedly arranged on the outer surface of the cooling pipe, and a spiral pipe is wound on the outer surface of the condensing sleeve by screws.

[0010] Preferably, an air extractor is arranged at one end of the spiral pipe, a temperature sensor is arranged on the top of the condensing sleeve near one side edge, and a backflow pipe is fixedly connected to the top end of the cooling pipe.

[0011] Preferably, a monitoring assembly is arranged on the outer surface of the oil tank near the bottom, the monitoring assembly comprises an outlet pipe, an intelligent control valve is arranged on the outer surface of the outlet pipe, a drainage pipe is fixedly connected to one end of the outlet pipe, a test bin is fixedly connected to one end of the drainage pipe, and a micro gas chromatograph is arranged in the test bin.

[0012] Preferably, a lead-out pipe is fixedly connected to the bottom of the test bin, an electromagnetic valve is arranged on the outer surface of the lead-out pipe, a recovery bin is fixedly installed on the outer surface of the oil tank, a transformer main oil pillow is arranged on the single-phase power transformer, and the high-voltage sleeve is arranged on the outer side of the oil tank.

[0013] Preferably, one end of the outlet pipe is fixedly penetrated into the inside of the oil tank, the bottom end of the lead-out pipe is fixedly penetrated into the inside of the recovery bin, the outer surface of the oil pump is fixedly connected to the outer surface of the oil tank by screws, and one end of the oil inlet pipe is fixedly penetrated into the inside of the oil tank.

[0014] Preferably, the outlet end of the oil pump is fixedly connected with the bottom end of the oil outlet pipe, the inlet end of the negative pressure pump is fixedly penetrated into the inside of the negative pressure tank, one end of the cooling pipe is fixedly penetrated into the inside of the negative pressure tank, and one end of the backflow pipe is fixedly penetrated into the inside of the oil tank.

[0015] A use method of a novel single-phase 400KV power transformer, comprising the following steps: S1, when the single-phase 400KV power transformer needs to be used, the intelligent control valve is opened, the quantitative insulating oil is delivered into the test bin, the micro gas chromatograph is started, and the specific concentration of each gas in the insulating oil is quickly converted; S2, when the micro gas chromatograph detects that the content of the released gas in the insulating oil exceeds the standard, the oil pump is started, and the impurities in the insulating oil are removed through the cooperation between the coarse filter plate and the fine filter plate; S3, the impurity filtered insulation oil is transported to the negative pressure tank, the negative pressure pump is started, the inside of the negative pressure tank is in a micro negative pressure state, moisture is escaped from the oil, and filtration of impurities and water in the insulation oil is completed; S4, then the air extractor is started, cooling gas is extracted to the external environment, the gas moves along the spiral pipe, finally flows out through the top of the spiral pipe, the condensing sleeve is cooled, and the insulation oil is cooled, the cooled insulation oil enters the inside of the oil tank through the backflow pipe, and the release amount of gas in the insulation oil is detected by the micro gas chromatograph again, whether the transformer is normally operated or not is judged.

[0016] Compared with the prior art, the beneficial effects of the present application are: 1, when the micro gas chromatograph detects that the release gas content in the insulation oil exceeds the standard, the oil pump is started, the impurities in the insulation oil are removed through the cooperation between the coarse filter plate and the fine filter plate, the impurity filtered insulation oil is transported to the negative pressure tank, the negative pressure pump is started, the inside of the negative pressure tank is in a micro negative pressure state, moisture is escaped from the oil, filtration of impurities and water in the insulation oil is completed, then the release amount of gas in the insulation oil is detected by the micro gas chromatograph again, whether the transformer is normally operated or not is judged, and through the cooperation between the filtering assembly and the cooling assembly, the problem that most power transformers in the prior art are only detected by simply extracting insulation oil to judge the running state of the transformer, which easily increases invalid operation and affects the normal operation of the power transformer is solved.

[0017] 2, when the single-phase 400KV power transformer needs to be used, the intelligent control valve is opened, the quantitative insulation oil is transported to the test bin, the micro gas chromatograph is started, the specific concentration of each gas in the insulation oil is quickly converted, and subsequent filtration of the insulation oil is facilitated.

[0018] 3, when the one-way valve corresponding to the filter tank is opened, the intelligent switch valve arranged at the top of the filter tank is closed, and the intelligent switch valve arranged at the top of the other filter tank is opened, so that continuous filtration of the insulation oil is realized. DETAILED DESCRIPTION

[0019] Figure 1 It is a front view of the novel single-phase 400KV power transformer; Figure 2 It is a side view of the novel single-phase 400KV power transformer; Figure 3 It is a single-phase power transformer part of the novel single-phase 400KV power transformer; Figure 4 It is an oil tank part of the novel single-phase 400KV power transformer; Figure 5 It is a new type of single-phase 400KV power transformer test chamber part of the sectional view; Figure 6 It is a new type of single-phase 400KV power transformer filter assembly part of the sectional view; Figure 7 It is a new type of single-phase 400KV power transformer oil outlet pipe part of the sectional view; Figure 8 It is a new type of single-phase 400KV power transformer filter tank part of the sectional view; Figure 9 It is a new type of single-phase 400KV power transformer cooling assembly part of the sectional view.

[0020] In the figure: 1, single-phase power transformer; 101, oil tank; 102, high voltage sleeve; 103, high voltage side piece; 104, transformer main oil pillow; 2, monitoring assembly; 201, liquid outlet pipe; 202, intelligent control valve; 203, drainage pipe; 204, test chamber; 205, micro gas chromatograph; 206, lead-out pipe; 207, electromagnetic valve; 208, recovery chamber; 3, filter assembly; 301, oil pump; 302, oil inlet pipe; 303, oil outlet pipe; 304, processing cavity; 305, filter tank; 306, intelligent switch valve; 307, coarse filter plate; 308, fine filter plate; 309, one-way valve; 310, negative pressure tank; 311, negative pressure pump; 312, conveying pipe; 313, water storage tank; 4, cooling assembly; 401, cooling pipe; 402, condensing sleeve; 403, spiral pipe; 404, exhaust fan; 405, temperature sensor; 406, return pipe. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0022] Reference Figures 1-9The utility model discloses a novel single-phase 400KV power transformer, including single-phase power transformer 1, single-phase power transformer 1 includes oil tank 101 and high voltage bushing 102, and both sides of high voltage bushing 102 are provided with high voltage side sheet 103, and the outer surface of oil tank 101 is provided with filter assembly 3, and filter assembly 3 includes oil outlet pipe 303 and processing cavity 304, and the bottom of processing cavity 304 is fixedly connected with two filter cans 305, and the inner wall of two filter cans 305 is fixedly installed with coarse filter plate 307 near the top, and the inner wall of two filter cans 305 is fixedly installed with fine filter plate 308 near the bottom, and the bottom end of two filter cans 305 is fixedly connected with negative pressure tank 310, and the outer surface of negative pressure tank 310 is fixedly installed with negative pressure pump 311 through screw, and the gas outlet end of negative pressure pump 311 is fixedly connected with conveying pipe 312, and the bottom end of conveying pipe 312 is fixedly connected with water storage tank 313, and filter assembly 3 further includes oil pump 301, and the liquid inlet end of oil pump 301 is fixedly connected with oil inlet pipe 302, and the outer surface of two filter cans 305 is provided with intelligent switch valve 306 near the top, and the outer surface of two filter cans 305 is provided with check valve 309 near the bottom, and the outer surface of filter assembly 3 is provided with cooling assembly 4, and cooling assembly 4 includes cooling pipe 401, and the outer surface of cooling pipe 401 is fixedly sleeved with condensing sleeve 402, and the outer surface of condensing sleeve 402 is wound with spiral pipe 403 through screw, and one end of spiral pipe 403 is provided with exhaust fan 404, and the top near one side edge of condensing sleeve 402 is provided with temperature sensor 405, and the top end of cooling pipe 401 is fixedly connected with backflow pipe 406, and one end of liquid outlet pipe 201 is fixedly penetrated to the inside of oil tank 101, and the bottom end of lead-out pipe 206 is fixedly penetrated to the inside of recovery bin 208, and the outer surface of oil pump 301 is fixedly connected with the outer surface of oil tank 101 through screw, and one end of oil inlet pipe 302 is fixedly penetrated to the inside of oil tank 101, and the liquid outlet end of oil pump 301 is fixedly connected with the bottom end of oil outlet pipe 303, and the liquid inlet end of negative pressure pump 311 is fixedly penetrated to the inside of negative pressure tank 310, and one end of cooling pipe 401 is fixedly penetrated to the inside of negative pressure tank 310, and one end of backflow pipe 406 is fixedly penetrated to the inside of oil tank 101.

[0023] In the embodiment, when the micro gas chromatograph 205 detects that the content of released gas in the insulating oil exceeds the standard, the oil pump 301 can be started by the external control system, so that the oil pump 301 drives the oil inlet pipe 302 to extract the insulating oil into the inside of the oil tank 101, the insulating oil enters the inside of the processing cavity 304 through the oil outlet pipe 303, then one of the intelligent switch valves 306 is opened by the external control system, so that the insulating oil enters the inside of the filter can 305 corresponding to the intelligent switch valve 306, and the impurities in the insulating oil are removed through the cooperation between the coarse filter plate 307 and the fine filter plate 308, wherein, for example, Figure 8As shown, the filter holes on the surface of the coarse filter plate 307 are larger than those on the surface of the fine filter plate 308. This is to separate large and small particulate impurities in the insulating oil for stratified filtration, thus ensuring the filtration efficiency of the insulating oil. After the insulating oil is filtered, the one-way valve 309 corresponding to the filter tank 305 can be opened, allowing the filtered insulating oil to enter the negative pressure tank 310 under its own gravity. Furthermore, when the one-way valve 309 corresponding to the filter tank 305 is opened, the intelligent switch valve 306 located at the top of the filter tank 305 can be closed, while the intelligent switch valve 306 located at the top of another filter tank 305 can be opened, thereby achieving continuous filtration of the insulating oil. After the insulating oil in the filter tank 305 corresponding to the one-way valve 309 has completely entered the negative pressure tank 310, the one-way valve 309 can be closed, and the negative pressure pump 311 can be started, so that the inside of the negative pressure tank 310 is in a slightly negative pressure state. The negative pressure will reduce the vapor pressure on the surface of the oil, break the balance between the evaporation and condensation of water in the oil, and make it easier for water to change from liquid to gas and escape from the oil. The negative pressure can reduce the boiling point of the insulating oil and the vapor pressure of water, allowing the water in the oil to evaporate and separate rapidly at a lower temperature, achieving the purpose of dehydration and purification. The evaporated water enters the interior of the water storage tank 313 through the transfer pipe 312, thereby realizing the filtration of impurities and water in the insulating oil. The filtered insulating oil is then opened through the external control system as follows: Figure 6As shown, a valve installed on the surface of the cooling pipe 401 allows the purified insulating oil to enter the interior of the condenser jacket 402. Then, the exhaust fan 404 is activated to draw cooling gas into the external environment. The gas moves along the spiral tube 403 and finally flows out through the top of the spiral tube 403, thus cooling the condenser jacket 402. Since the condenser jacket 402 is made of aluminum alloy with high thermal conductivity, it can achieve rapid heat transfer, cooling the insulating oil. The temperature of the insulating oil after cooling is detected by a temperature sensor 405. The temperature sensor 405 detects the temperature of the insulating oil by correlating the material's temperature with its physical properties. Changes in the insulating oil temperature cause changes in the resistance, voltage, and deformation of the sensor's core material. By measuring and converting these changes, the actual temperature of the insulating oil can be obtained. When the temperature sensor 405 detects that the temperature of the insulating oil has not dropped to the required temperature, the external control system can increase the speed of the exhaust fan 404 until the insulating oil is cooled to the required temperature. After being cooled, the insulating oil can enter the interior of the oil tank 101 through the return pipe 406, realizing the circulation, filtration, and cooling of the insulating oil in the oil tank 101. After the insulating oil in the oil tank 101 is treated, the intelligent control valve 202 can be opened again, and the amount of gas released in the insulating oil can be detected again by the micro gas chromatograph 205. If the amount of gas released in the insulating oil is still abnormal, the signal can be transmitted to the external control system to perform maintenance on the transformer. When the amount of gas released in the insulating oil returns to the specified value, it indicates that the problem is caused by the condition of the insulating oil itself and the transformer is not damaged. Through the cooperation between the filter component 3 and the cooling component 4, the insulating oil is filtered in time when abnormalities occur, and then the transformer is judged to be abnormal. This improves the accuracy of judging the transformer's operating status by the insulating oil, and solves the problem that in the existing technology, most power transformers can easily increase ineffective maintenance and affect the normal operation of the power transformer by simply extracting the insulating oil to detect the amount of gas released.

[0024] like Figures 1-5As shown, a monitoring component 2 is installed on the outer surface of the oil tank 101 near the bottom. The monitoring component 2 includes an outlet pipe 201, an intelligent control valve 202 on the outer surface of the outlet pipe 201, a drainage pipe 203 fixedly connected to one end of the outlet pipe 201, a test chamber 204 fixedly connected to one end of the drainage pipe 203, a miniature gas chromatograph 205 installed inside the test chamber 204, an outlet pipe 206 fixedly connected to the bottom of the test chamber 204, and a solenoid valve 2 on the outer surface of the outlet pipe 206. 07. A recovery chamber 208 is fixedly installed on the outer surface of the oil tank 101. The single-phase power transformer 1 is also equipped with a transformer main oil conservator 104. The high-voltage bushing 102 is located on the outside of the oil tank 101. One end of the outlet pipe 201 is fixedly inserted into the interior of the oil tank 101. The bottom end of the lead pipe 206 is fixedly inserted into the interior of the recovery chamber 208. The outer surface of the oil pump 301 is fixedly connected to the outer surface of the oil tank 101 by screws. One end of the oil inlet pipe 302 is fixedly inserted into the interior of the oil tank 101.

[0025] In this embodiment, when a single-phase 400kV power transformer is required in a power engineering project, to ensure its normal operation, the intelligent control valve 202 is periodically opened by an external control system. This allows a quantitative amount of insulating oil in the oil tank 101 to enter the test chamber 204 through the outlet pipe 201 and the drainage pipe 203. Then, the micro gas chromatograph 205 is activated to detect the extracted insulating oil. The micro gas chromatograph 205 utilizes gas chromatography separation technology combined with a dedicated detector, along with automated control and data processing, to complete the entire process from degassing and separation to quantitative detection. It is suitable for the precise analysis of trace gases in transformer insulating oil, requiring no manual intervention. After manual intervention, the degassed mixed gas is precisely sampled in quantitative volume using the instrument's automatic sampler and sent to the vaporization chamber at the injection port. Here, the gas sample is rapidly vaporized and then carried into the chromatographic column by a high-purity carrier gas. This process avoids errors from manual sample introduction and ensures the consistency of sample volume. A dedicated chromatographic column adapted for insulating oil gas detection is then used. Based on the differences in the polarity and adsorption coefficients of different gas components, the specific concentration of each gas in the insulating oil is quickly calculated. After detection, the lead-out tube 206 is opened via the external control system, allowing the tested insulating oil to enter the recovery chamber 208 for recovery. For example... Figure 1 As shown, by setting the high-voltage side plate 103 on both sides of the high-voltage bushing 102, it not only occupies a small area and is aesthetically pleasing and neat, but also facilitates the arrangement of the neutral point busbar on site.

[0026] In this invention, when a single-phase 400kV power transformer is required in power engineering, the intelligent control valve 202 is periodically opened via an external control system. This allows a fixed quantity of insulating oil in the oil tank 101 to enter the test chamber 204 through the outlet pipe 201 and the drain pipe 203. Then, the micro gas chromatograph 205 is activated to detect the extracted insulating oil and quickly calculate the specific concentration of each gas in the insulating oil. After the detection is complete, the outlet pipe 206 is opened via the external control system, allowing the tested insulating oil to enter the return flow through the outlet pipe 206. The insulating oil is recycled inside the receiving chamber 208. When the micro gas chromatograph 205 detects that the content of released gas in the insulating oil exceeds the standard, the oil pump 301 is started through the external control system, which drives the oil inlet pipe 302 to draw insulating oil into the oil tank 101. The insulating oil enters the processing chamber 304 through the oil outlet pipe 303. Then, one of the intelligent switch valves 306 is opened through the external control system, allowing the insulating oil to enter the filter tank 305 corresponding to the intelligent switch valve 306. Through the cooperation between the coarse filter plate 307 and the fine filter plate 308, impurities in the insulating oil are removed. After the insulating oil is filtered, the one-way valve 309 corresponding to the filter tank 305 can be opened, allowing the filtered insulating oil to enter the negative pressure tank 310 under its own gravity. Additionally, when the one-way valve 309 corresponding to the filter tank 305 is opened, the intelligent switch valve 306 located at the top of the filter tank 305 is closed, while the intelligent switch valve 306 located at the top of another filter tank 305 is opened, thus achieving continuous filtration of the insulating oil. When the insulating oil in the filter tank 305 corresponding to the opened one-way valve 309 has completely entered the negative pressure tank 310... After the oil is inside tank 300, the one-way valve 309 can be closed, and the negative pressure pump 311 can be started. This creates a slightly negative pressure inside the negative pressure tank 310. The negative pressure reduces the vapor pressure on the oil surface, disrupting the equilibrium between the evaporation and condensation of water in the oil. This makes it easier for water to change from a liquid to a gaseous state and escape from the oil. The negative pressure also lowers the boiling point of the insulating oil and the vapor pressure of the water, allowing the water in the oil to evaporate and separate rapidly at a lower temperature. The evaporated water enters the water storage tank 313 through the transfer pipe 312, thus filtering impurities and water from the insulating oil. The filtered insulating oil is then opened through the external control system... Figure 6As shown, a valve installed on the surface of the cooling pipe 401 allows the purified insulating oil to enter the interior of the condenser jacket 402. Then, the exhaust fan 404 is activated to draw cooling gas into the external environment. The gas moves along the spiral tube 403 and finally flows out through the top of the spiral tube 403, cooling the condenser jacket 402. Because the condenser jacket 402 is made of aluminum alloy with high thermal conductivity, it can achieve rapid heat transfer, thus cooling the insulating oil. The temperature of the insulating oil after cooling is detected by the temperature sensor 405. When the temperature sensor 405 detects that the temperature of the insulating oil has not dropped to the required temperature, an external control system can be activated to add more cooling gas. The speed of the fast exhaust fan 404 is maintained until the insulating oil is cooled to the required temperature. The cooled insulating oil can then enter the interior of the oil tank 101 through the return pipe 406 to achieve circulation filtration and cooling of the insulating oil in the oil tank 101. After the insulating oil in the oil tank 101 has been treated, the intelligent control valve 202 can be opened again, and the amount of gas released in the insulating oil can be detected again by the micro gas chromatograph 205. If the amount of gas released in the insulating oil is still abnormal, the signal can be transmitted to the external control system to repair the transformer. When the amount of gas released in the insulating oil returns to the specified value, it indicates that the problem is caused by the condition of the insulating oil itself and the transformer is not damaged.

[0027] The wiring diagrams for the single-phase power transformer 1, intelligent control valve 202, micro gas chromatograph 205, solenoid valve 207, oil pump 301, intelligent switching valve 306, check valve 309, negative pressure pump 311, exhaust fan 404, and temperature sensor 405 in this invention are common knowledge in the field, and their working principles are known technologies. The appropriate models are selected according to actual use. Therefore, the control methods and wiring layouts for the single-phase power transformer 1, intelligent control valve 202, micro gas chromatograph 205, solenoid valve 207, oil pump 301, intelligent switching valve 306, check valve 309, negative pressure pump 311, exhaust fan 404, and temperature sensor 405 will not be explained in detail.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A novel single-phase 400kV power transformer, comprising a single-phase power transformer (1), wherein the single-phase power transformer (1) includes an oil tank (101) and a high-voltage bushing (102), wherein high-voltage side plates (103) are provided on both sides of the high-voltage bushing (102), characterized in that: The outer surface of the oil tank (101) is provided with a filter assembly (3). The filter assembly (3) includes an oil outlet pipe (303) and a processing chamber (304). The bottom of the processing chamber (304) is fixedly connected to two filter tanks (305). A coarse filter plate (307) is fixedly installed on the inner wall of the two filter tanks (305) near the top. A fine filter plate (308) is fixedly installed on the inner wall of the two filter tanks (305) near the bottom. A negative pressure tank (310) is fixedly connected between the bottom ends of the two filter tanks (305). A negative pressure pump (311) is fixedly installed on the outer surface of the negative pressure tank (310) by screws. The air outlet of the negative pressure pump (311) is fixedly connected to a transmission pipe (312). The bottom end of the transmission pipe (312) is fixedly connected to a water storage tank (313).

2. The novel single-phase 400kV power transformer according to claim 1, characterized in that: The filter assembly (3) also includes an oil pump (301), and the inlet end of the oil pump (301) is fixedly connected to an oil inlet pipe (302).

3. The novel single-phase 400kV power transformer according to claim 2, characterized in that: Intelligent switching valves (306) are provided on the outer surface of both filter tanks (305) near the top, and one-way valves (309) are provided on the outer surface of both filter tanks (305) near the bottom.

4. The novel single-phase 400kV power transformer according to claim 3, characterized in that: The outer surface of the filter assembly (3) is provided with a cooling assembly (4), the cooling assembly (4) includes a cooling pipe (401), the outer surface of the cooling pipe (401) is fixedly fitted with a condenser sleeve (402), and the outer surface of the condenser sleeve (402) is wound with a spiral tube (403) by screws.

5. The novel single-phase 400kV power transformer according to claim 4, characterized in that: A fan (404) is provided at one end of the spiral tube (403), a temperature sensor (405) is provided at the top of the condenser jacket (402) near one side edge, and a return pipe (406) is fixedly connected to the top of the cooling tube (401).

6. The novel single-phase 400kV power transformer according to claim 5, characterized in that: A monitoring component (2) is provided on the outer surface of the oil tank (101) near the bottom. The monitoring component (2) includes an outlet pipe (201). An intelligent control valve (202) is provided on the outer surface of the outlet pipe (201). One end of the outlet pipe (201) is fixedly connected to a drainage pipe (203). One end of the drainage pipe (203) is fixedly connected to a test chamber (204). A miniature gas chromatograph (205) is provided inside the test chamber (204).

7. The novel single-phase 400kV power transformer according to claim 6, characterized in that: The bottom of the test chamber (204) is fixedly connected to an outlet pipe (206), and an electromagnetic valve (207) is provided on the outer surface of the outlet pipe (206). A recovery chamber (208) is fixedly installed on the outer surface of the oil tank (101). The single-phase power transformer (1) is also provided with a transformer main oil conservator (104), and the high-voltage bushing (102) is located on the outside of the oil tank (101).

8. The novel single-phase 400kV power transformer according to claim 7, characterized in that: One end of the outlet pipe (201) is fixedly inserted into the interior of the oil tank (101), the bottom end of the outlet pipe (206) is fixedly inserted into the interior of the recovery chamber (208), the outer surface of the oil pump (301) is fixedly connected to the outer surface of the oil tank (101) by screws, and one end of the oil inlet pipe (302) is fixedly inserted into the interior of the oil tank (101).

9. The novel single-phase 400kV power transformer according to claim 8, characterized in that: The outlet end of the oil pump (301) is fixedly connected to the bottom end of the oil outlet pipe (303), the inlet end of the negative pressure pump (311) is fixedly inserted into the interior of the negative pressure tank (310), one end of the cooling pipe (401) is fixedly inserted into the interior of the negative pressure tank (310), and one end of the return pipe (406) is fixedly inserted into the interior of the oil tank (101).

10. A method for using a novel single-phase 400kV power transformer, characterized in that, The novel single-phase 400kV power transformer according to claim 9 is used, comprising the following steps: S1. When a single-phase 400KV power transformer is required, open the intelligent control valve (202) to deliver a quantitative amount of insulating oil to the test chamber (204), start the micro gas chromatograph (205), and quickly calculate the specific concentration of each gas in the insulating oil. S2. When the micro gas chromatograph (205) detects that the content of gas released in the insulating oil exceeds the standard, the oil pump (301) is started, and the impurities in the insulating oil are removed through the cooperation between the coarse filter plate (307) and the fine filter plate (308). S3. The insulating oil after impurity filtration is then transported to the negative pressure tank (310). The negative pressure pump (311) is started to make the inside of the negative pressure tank (310) a slightly negative pressure state, so that water escapes from the oil and the impurities and water in the insulating oil are filtered out. S4. Then the exhaust fan (404) can be started to draw cooling gas into the external environment. The gas moves along the spiral tube (403) and finally flows out through the top of the spiral tube (403) to cool the condenser jacket (402), thereby cooling the insulating oil. The cooled insulating oil can then enter the interior of the oil tank (101) through the return pipe (406). The amount of gas released in the insulating oil is detected again by the micro gas chromatograph (205) to determine whether the transformer is operating normally.

Images