Vacuum oil filling structure and working method of large oil-immersed transformer and oil storage cabinet

Abstract

The invention relates to a vacuum oil injection structure of a large oil-immersed transformer and an oil conservator and a working method thereof, wherein the vacuum oil injection structure of the large oil-immersed transformer and the oil conservator comprises a large oil-immersed transformer having an oil inlet and a first negative pressure port, an oil conservator is arranged above the large oil-immersed transformer, a vacuum oil injection transition oil tank is arranged beside the large oil-immersed transformer, a third connecting pipeline having a third butterfly valve is connected between the vacuum oil injection transition oil tank and the oil conservator, a second connecting pipeline having a second butterfly valve is connected between the oil conservator and the large oil-immersed transformer, a first butterfly valve is arranged on the first negative pressure port, a second negative pressure port connected to a vacuum pump is arranged on the vacuum oil injection transition oil tank, a vacuum pump inlet is connected to a first end of the first connecting pipeline, and a second end of the first connecting pipeline is connected to the first butterfly valve or the second negative pressure port. The invention can cooperate to realize vacuum oil injection of oil conservators of transformers of various types, and ensure that the oil conservator is fully degassed and the transformer is reasonably partially discharged.

Description

Technical field:

[0002] The invention relates to a vacuum oil filling structure of a large oil-immersed transformer and an oil storage cabinet and a working method thereof. Background technology:

[0004] In the traditional large oil-immersed transformer vacuum oil filling process, only the oil tank part of the transformer can be vacuum oiled, but the oil conservator part cannot be vacuum oiled, which leads to insufficient degassing of the transformer oil in the oil conservator part, and thus excessive partial discharge of the entire transformer. Summary of the invention:

[0006] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a vacuum oil filling structure for a large oil-immersed transformer and an oil conservator and a working method thereof. The vacuum oil filling structure for the large oil-immersed transformer and the oil conservator is reasonably designed, which is conducive to vacuum oil filling of the large oil-immersed transformer and the oil conservator, ensuring that the oil conservator is fully degassed and ensuring reasonable partial discharge of the transformer.

[0007] The vacuum oil filling structure of a large oil-immersed transformer and an oil conservator of the present invention is characterized in that it includes a large oil-immersed transformer with an oil inlet and a first negative pressure port, an oil conservator is arranged above the large oil-immersed transformer, a vacuum oil filling transition oil tank is arranged beside the large oil-immersed transformer, a third connecting pipeline with a third butterfly valve is connected between the vacuum oil filling transition oil tank and the oil conservator, a second connecting pipeline with a second butterfly valve is connected between the oil conservator and the large oil-immersed transformer, a first butterfly valve is arranged on the first negative pressure port, a second negative pressure port connected to a vacuum pump is arranged on the vacuum oil filling transition oil tank, the vacuum pump inlet is connected to the first end of the first connecting pipeline, and the second end of the first connecting pipeline is connected to the first butterfly valve or the second negative pressure port.

[0008] Furthermore, the above-mentioned vacuum oil-filled transition oil tank is a rectangular box body, which has an oil discharge port on its side, and its upper surface has a joint connected to the third connecting pipeline and the second negative pressure port, and the second negative pressure port is provided with a pipe joint connected to the first connecting pipeline.

[0009] Furthermore, an oil level gauge is provided on the vacuum oil filling transition oil tank.

[0010] Furthermore, the first negative pressure port is arranged on the upper surface of the large oil-immersed transformer, the connection position between the second connecting pipeline and the large oil-immersed transformer is also located on the upper surface of the large oil-immersed transformer, and the oil inlet is located on the lower side of the large oil-immersed transformer.

[0011] Furthermore, the pipe opening connecting the oil conservator to the third connecting pipeline is located at the upper part of the oil conservator, and the pipe opening connecting the oil conservator to the second connecting pipeline is located at the side of the oil conservator.

[0012] Furthermore, the above-mentioned vacuum oil-filled transition oil tank includes an upper top plate, a lower bottom plate and four enclosures arranged between the upper top plate and the lower bottom plate, the enclosure is provided with the oil drain port, the upper top plate is provided with a joint connected to the third connecting pipe and the second negative pressure port, and a reinforcing rib plate is provided between the upper top plate and the lower bottom plate and on the periphery of the four enclosures.

[0013] The working method of the vacuum oil filling structure of a large oil-immersed transformer and an oil storage cabinet of the present invention is characterized in that: the vacuum oil filling structure of the large oil-immersed transformer and the oil storage cabinet comprises a large oil-immersed transformer with an oil inlet and a first negative pressure port, an oil storage cabinet is arranged above the large oil-immersed transformer, a vacuum oil filling transition oil tank is arranged beside the large oil-immersed transformer, a third connecting pipeline with a third butterfly valve is connected between the vacuum oil filling transition oil tank and the oil storage cabinet, a second connecting pipeline with a second butterfly valve is connected between the oil storage cabinet and the large oil-immersed transformer, a first butterfly valve is arranged on the first negative pressure port, a second negative pressure port connected to a vacuum pump is arranged on the vacuum oil filling transition oil tank, the vacuum pump inlet is connected to the first end of the first connecting pipeline, and the second end of the first connecting pipeline is connected to the first butterfly valve or the second negative pressure port; when working, the first step is to fill the large oil-immersed transformer with oil, the oil inlet is connected to the oil inlet pipeline, the first end of the first connecting pipeline is connected to the inlet of the vacuum pump, and the first connecting The second end of the pipeline is connected to one end of the first butterfly valve, and the other end of the first butterfly valve is connected to the first negative pressure port. At this time, the first butterfly valve is opened to connect the pipeline, and the second butterfly valve and the third butterfly valve are closed to disconnect the pipeline, and the vacuum pump is started to work, and oil enters the large oil-immersed transformer from the oil inlet until the large oil-immersed transformer is filled with oil; the second step is to fill the oil conservator with oil, at this time, the first butterfly valve is closed, the second butterfly valve and the third butterfly valve are opened, and the connection between the second end of the first connecting pipeline and the first butterfly valve is changed to be connected to the second negative pressure port, and the vacuum pump is started to work, and the oil continues to enter the large oil-immersed transformer from the oil inlet and enters the oil conservator through the second connecting pipeline. After the oil in the oil conservator is full, it overflows into the vacuum oil filling transition tank through the third connecting pipeline. After there is oil in the vacuum oil filling transition tank, the oil filling speed can be reduced. When the oil level in the vacuum oil filling transition tank rises at a uniform speed, it indicates that the vacuum oil filling of the oil conservator has been completed, and the oil filling is stopped and the vacuum pump is turned off.

[0014] The advantages of the vacuum oil filling structure of the large oil-immersed transformer and the oil storage cabinet of the present invention are as follows: 1. It can cooperate to realize the vacuum oil filling of oil storage cabinets of various types of transformers, ensure that the oil storage cabinets are fully degassed, and ensure the reasonable partial discharge of the transformer; 2. It can cooperate to simply judge the vacuum oil filling cut-off time; 3. It can prevent the transformer oil from being sucked into the vacuum pump; 4. The vacuum oil filling transition oil tank can withstand the vacuum pressure of 130pa for a long time, ensuring the working reliability.

[0015] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Description of the drawings:

[0017] Figure 1 It is a schematic diagram of the present invention;

[0018] Figure 2 It is a perspective view of the vacuum oil filling transition oil tank of the present invention. Specific implementation method:

[0020] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description.

[0021] The vacuum oil filling structure of a large oil-immersed transformer and an oil conservator of the present invention comprises a large oil-immersed transformer 3 having an oil inlet 1 and a first negative pressure port 2, an oil conservator 4 is arranged above the large oil-immersed transformer 3, a vacuum oil filling transition oil tank 5 is arranged beside the large oil-immersed transformer 3, a third connecting pipeline 7 having a third butterfly valve 6 is connected between the vacuum oil filling transition oil tank 5 and the oil conservator 4, a second connecting pipeline 9 having a second butterfly valve 8 is connected between the oil conservator 4 and the large oil-immersed transformer 3, a first butterfly valve 10 is arranged on the first negative pressure port 2, a second negative pressure port 12 connected to a vacuum pump 11 is arranged on the vacuum oil filling transition oil tank 5, an inlet of the vacuum pump 11 is connected to a first end of a first connecting pipeline 18, a second end of the first connecting pipeline 18 is connected to the first butterfly valve 10 or the second negative pressure port 12, and the oil conservator 4 can be fixed on the large oil-immersed transformer 3 through a connector 19.

[0022] Furthermore, for the sake of reasonable design, the above-mentioned vacuum oil injection transition oil tank 5 is a rectangular box body, with an oil discharge port 14 on its side, and a joint 15 connected to the third connecting pipe and the second negative pressure port 12 on its upper surface. The second negative pressure port 12 is provided with a pipe joint 16 connected to the first connecting pipe 18. Neither the first connecting pipe 18 nor the third connecting pipe 7 extends into the vacuum oil injection transition oil tank 5. Under the action of the vacuum pump, the vacuum oil injection transition oil tank 5 only generates negative pressure, and no oil will flow to the vacuum pump 11.

[0023] Furthermore, in order to facilitate checking the oil level, an oil level gauge 17 is provided on the side of the vacuum oil filling transition oil tank, through which the oil level gauge 17 can be used to conveniently check the oil level to determine the vacuum oil filling cut-off time.

[0024] Furthermore, the first negative pressure port 2 is arranged on the upper surface of the large oil-immersed transformer, the connection position of the second connecting pipe 9 and the large oil-immersed transformer 3 is also located on the upper surface of the large oil-immersed transformer, the oil inlet 1 is located at the lower side of the large oil-immersed transformer, and the connection position of the second connecting pipe 9 and the large oil-immersed transformer 3 is also located on the upper surface of the large oil-immersed transformer, so that the large oil-immersed transformer 3 will overflow into the oil storage cabinet 4 through the second connecting pipe 9 and the second butterfly valve 8 only after the large oil-immersed transformer 3 is filled with oil.

[0025] Furthermore, the pipe opening connecting the oil conservator 4 and the third connecting pipe 7 is located at the upper part of the oil conservator, the pipe opening connecting the oil conservator 4 and the second connecting pipe 9 is located at the side of the oil conservator, and the pipe opening connecting the oil conservator 4 and the third connecting pipe 7 is located at the upper part of the oil conservator, so that the oil will overflow into the vacuum oil filling transition tank 5 through the third connecting pipe 7 and the third butterfly valve 6 only after the oil conservator 4 is full of oil.

[0026] Furthermore, the vacuum oil injection transition oil tank 5 comprises an upper top plate 501, a lower bottom plate 502 and four enclosures 503 arranged between the upper top plate and the lower bottom plate, the enclosure 503 is provided with the oil drain port 14, the upper top plate is provided with a joint 15 connected to the third connecting pipe and the second negative pressure port 12, reinforcing rib plates 504 are provided between the upper top plate and the lower bottom plate and located on the periphery of the four enclosures, and two rectangular sheet-shaped reinforcing rib plates 504 are provided on the periphery of each enclosure, and the enclosures and the upper top plate 501 and the lower bottom plate 502 can be fixed by welding. Through the above structure, the structure of the vacuum oil injection transition oil tank 5 is relatively stable and reliable, and a lifting ring 505 is provided on the upper top plate 501 to facilitate lifting.

[0027] The working method of the vacuum oil filling structure of a large oil-immersed transformer and an oil conservator of the present invention, the vacuum oil filling structure of the large oil-immersed transformer and the oil conservator comprises a large oil-immersed transformer 3 having an oil inlet 1 and a first negative pressure port 2, an oil conservator 4 is arranged above the large oil-immersed transformer 3, a vacuum oil filling transition oil tank 5 is arranged beside the large oil-immersed transformer 3, a third connecting pipeline 7 having a third butterfly valve 6 is connected between the vacuum oil filling transition oil tank 5 and the oil conservator 4, a second connecting pipeline 9 having a second butterfly valve 8 is connected between the oil conservator 4 and the large oil-immersed transformer 3, a first butterfly valve 10 is arranged on the first negative pressure port 2, a second negative pressure port 12 connected to a vacuum pump 11 is arranged on the vacuum oil filling transition oil tank 5, the inlet of the vacuum pump 11 is connected to the first end of the first connecting pipeline 18, and the second end of the first connecting pipeline 18 is connected to the first butterfly valve 10 or the second negative pressure port 12; when working, the first step is to fill the large oil-immersed transformer with oil, the oil inlet is connected to the oil inlet pipeline, the first end of the first connecting pipeline is connected to the first butterfly valve 10 or the second negative pressure port 12. The inlet of the vacuum pump is connected, and the second end of the first connecting pipeline is connected to one end of the first butterfly valve, and the other end of the first butterfly valve is connected to the first negative pressure port. At this time, the first butterfly valve is opened to connect the pipeline, and the second butterfly valve and the third butterfly valve are closed to disconnect the pipeline, and the vacuum pump starts to work, and oil enters the large oil-immersed transformer from the oil inlet until the large oil-immersed transformer is filled with oil; the second step is to fill the oil conservator with oil, at this time, the first butterfly valve is closed, the second butterfly valve and the third butterfly valve are opened, and the connection between the second end of the first connecting pipeline and the first butterfly valve is changed to be connected to the second negative pressure port, and the vacuum pump is started to work, and the oil continues to enter the large oil-immersed transformer from the oil inlet and enters the oil conservator through the second connecting pipeline. After the oil in the oil conservator is full, it overflows into the vacuum oil filling transition tank through the third connecting pipeline. After there is oil in the vacuum oil filling transition tank, the oil filling speed can be reduced. When the oil level in the vacuum oil filling transition tank rises at a uniform speed, it indicates that the vacuum oil filling of the oil conservator has been completed, and the oil filling is stopped and the vacuum pump is turned off.

[0028] The advantages of the vacuum oil filling structure of the large oil-immersed transformer and the oil storage cabinet of the present invention are as follows: 1. It can cooperate to realize the vacuum oil filling of oil storage cabinets of various types of transformers, ensure that the oil storage cabinets are fully degassed, and ensure the reasonable partial discharge of the transformer; 2. It can cooperate to simply judge the vacuum oil filling cut-off time; 3. It can prevent the transformer oil from being sucked into the vacuum pump; 4. The vacuum oil filling transition oil tank can withstand the vacuum pressure of 130pa for a long time, ensuring the working reliability.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A working method of a vacuum oil injection structure, characterized in that: The vacuum oil injection structure comprises a large oil-immersed transformer having an oil inlet and a first negative pressure port, an oil storage cabinet is arranged above the large oil-immersed transformer, a vacuum oil injection transition oil tank is arranged beside the large oil-immersed transformer, a third connecting pipeline having a third butterfly valve is connected between the vacuum oil injection transition oil tank and the oil storage cabinet, a second connecting pipeline having a second butterfly valve is connected between the oil storage cabinet and the large oil-immersed transformer, a first butterfly valve is arranged on the first negative pressure port, a second negative pressure port connected to a vacuum pump is arranged on the vacuum oil injection transition oil tank, the vacuum pump inlet is connected to the first end of the first connecting pipeline, and the second end of the first connecting pipeline is connected to the first butterfly valve or the second negative pressure port; the vacuum oil injection transition oil tank is A rectangular box body, with an oil drain port on its side, a joint connected to the third connecting pipeline and the second negative pressure port on its upper surface, and a pipe joint connected to the first connecting pipeline is provided on the second negative pressure port; an oil level gauge is provided on the vacuum oil filling transition tank; the first negative pressure port is provided on the upper surface of the large oil-immersed transformer, the connection position of the second connecting pipeline and the large oil-immersed transformer is also located on the upper surface of the large oil-immersed transformer, and the oil inlet is located on the lower side of the large oil-immersed transformer; the pipe port connecting the oil conservator and the third connecting pipeline is located on the upper part of the oil conservator, and the pipe port connecting the oil conservator and the second connecting pipeline is located on the side of the oil conservator; the vacuum oil filling transition tank includes an upper top plate, The lower bottom plate and four enclosures arranged between the upper top plate and the lower bottom plate, the enclosure is provided with the oil drain port, the upper top plate is provided with a joint connected to the third connecting pipeline and the second negative pressure port, and a reinforcing rib plate is provided between the upper top plate and the lower bottom plate and located on the periphery of the four enclosures; when working, the first step is to fill the large oil-immersed transformer with oil, the oil inlet is connected to the oil inlet pipeline, the first end of the first connecting pipeline is connected to the inlet of the vacuum pump, the second end of the first connecting pipeline is connected to one end of the first butterfly valve, and the other end of the first butterfly valve is connected to the first negative pressure port. At this time, the first butterfly valve is opened to connect the pipeline, the second butterfly valve and the third butterfly valve are closed to disconnect the pipeline, the vacuum pump starts to work, and the oil enters the large oil-immersed transformer from the oil inlet. The first step is to fill the oil conservator with oil, at which time the first butterfly valve is closed, the second butterfly valve and the third butterfly valve are opened, and the second end of the first connecting pipeline is connected to the first butterfly valve instead of the second negative pressure port, and the vacuum pump is started. The oil continues to enter the large oil-immersed transformer from the oil inlet and enters the oil conservator through the second connecting pipeline. When the oil in the oil conservator is full, it overflows into the vacuum oil filling transition tank through the third connecting pipeline. When there is oil in the vacuum oil filling transition tank, the oil filling speed can be reduced. When the oil level in the vacuum oil filling transition tank rises at a uniform speed, it indicates that the vacuum oil filling of the oil conservator has been completed, and the oil filling is stopped and the vacuum pump is turned off.

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