A multifunctional transformer oil pillow

Abstract

The present application relates to the field of transformer oil pillow, and particularly relates to a multifunctional transformer oil pillow, which comprises an oil pillow box body, a circulating air exchange mechanism with inert gas as internal circulating gas is connected to the oil pillow box body, the circulating air exchange mechanism comprises a measuring tube buffer chamber installed outside the oil pillow box body, a blowing measuring tube is connected to the bottom of the measuring tube buffer chamber, one end of the bottom of the blowing measuring tube extends to below the oil level in the oil pillow box body, a pressure transmitter and a pressure gauge are installed on the measuring tube buffer chamber, the measuring tube buffer chamber is sequentially connected to a constant value device, a filter pressure reducing valve, a gas storage tank and a fan through a rear air pipe, the air inlet of the fan is connected to the side wall of the oil pillow box body above the oil level, and a corrugated cover is further installed on the oil pillow box body. The transformer oil pillow is convenient to know the insulating oil level and keep the stability of the pressure in the oil pillow box body.

Description

Technical Field

[0001] This invention relates to the field of transformer oil conservators, and particularly to a multifunctional transformer oil conservator. Background Technology

[0002] As a crucial piece of equipment in the power system, the reliability of a transformer's operation is closely related to the safety and stability of the power system. The insulation material impregnated in transformer oil not only improves the internal insulation strength of the transformer but also prevents moisture corrosion. Therefore, the amount of insulating oil inside the transformer affects not only the insulation level of the transformer equipment but also the service life of the internal insulation materials and the heat dissipation capacity during operation. Thus, transformers are usually used in conjunction with oil conservators. When the transformer temperature rises, the cooling oil inside the transformer expands due to heat, and some of the cooling oil flows from the transformer into the oil conservator. When the transformer temperature drops, the cooling oil inside the transformer shrinks due to cooling, and some of the cooling oil in the oil conservator flows from the conservator into the transformer. Therefore, oil conservators commonly serve as storage tanks for insulating oil.

[0003] However, ordinary oil-filled pillows have at least the following drawbacks:

[0004] 1. Traditional oil level monitors suffer from false oil level readings due to factors such as bent or broken oil gauge linkages, detached or malfunctioning gauge pointers, etc., making it impossible to obtain accurate oil level readings;

[0005] 2. During the operation of a transformer, heat is generated. Excessive temperature will affect the efficiency of voltage conversion and increase losses. Traditional oil tanks cannot cool the insulating oil.

[0006] 3. During daily operation, the intense impact motion generated by voltage and current in the transformer, along with the metal shavings and non-metallic impurities produced by friction, reduces the performance of the transformer oil. Furthermore, the accumulation of a large number of impurities can clog the oil pipeline, preventing the transformer oil from being output from inside the transformer. This leads to a surge in internal pressure and ultimately causes the transformer to burst. To ensure the long-term stable operation of the transformer, it is necessary to filter the insulating oil to guarantee its safe operation. However, traditional oil tanks cannot achieve this filtering of insulating oil. Summary of the Invention

[0007] The purpose of this invention is to provide a multifunctional transformer oil conservator, which facilitates the determination of the insulating oil level and maintains stable pressure within the conservator tank.

[0008] The technical solution of this invention is as follows: a multifunctional transformer oil conservator, including an oil conservator housing, a circulation and ventilation mechanism with inert gas as the internal circulating gas connected to the oil conservator housing, the circulation and ventilation mechanism including a measuring tube buffer chamber installed outside the oil conservator housing, a blowing measuring tube connected to the bottom of the measuring tube buffer chamber, one end of the blowing measuring tube extending to below the oil level inside the oil conservator housing, a pressure transmitter and a pressure gauge installed on the measuring tube buffer chamber, the measuring tube buffer chamber being connected in sequence to a setpoint device, a filter pressure reducing valve, an air storage tank and a fan through a back air pipe, the air inlet of the fan being connected to the side wall of the oil conservator housing above the oil level; a corrugated cover is also installed on the oil conservator housing.

[0009] A ball valve is installed on the pipeline between the measuring tube buffer chamber and the setter; an instrument needle valve is installed on the pipeline between the filter pressure reducing valve and the air tank.

[0010] The gas storage tank is connected to a cooling mechanism for cooling the inert gas inside the tank.

[0011] The cooling mechanism includes cooling coils surrounding the outer wall of the gas storage tank, and coolant circulates within the cooling coils.

[0012] A filter mechanism is also provided at the bottom end of the air blowing measuring tube.

[0013] The filtration mechanism includes a bracket installed on the air blowing measuring tube, and a filter screen bag fitted onto the air outlet at the lower end of the air blowing measuring tube.

[0014] An alarm mechanism is also installed on the oil tank.

[0015] The alarm mechanism includes a microcontroller and an alarm device, and the alarm device and the pressure gauge are both electrically connected to the microcontroller.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. Inert gas is filtered by a pressure reducing valve and then the supply pressure is reduced to a constant value by a setter, ensuring that the air inlet pressure of the measuring tube buffer chamber is constant. The magnitude of this constant pressure depends on the height of the insulating liquid. Finally, this clean, constant-pressure air passes through the measuring tube buffer chamber and is blown into the oil conservator tank through the air blowing measuring tube. When the pressure blown into the air blowing measuring tube is approximately equal to the height of the liquid level, the pressure value measured by the instrument is the height of the liquid level, thus obtaining the liquid level information of the oil conservator tank.

[0018] 2. With the continuous ventilation of the fan, the inert gas can circulate in the oil conservator box. The circulating gas can maintain the stability of the pressure in the oil conservator box, and the circulating gas can remove the heat in the oil conservator box, reduce the temperature in the oil conservator box, and play a role in cooling the insulating oil.

[0019] 3. The expansion and contraction of the corrugated cover can reflect the free change of the volume of insulating oil in the oil conservator box with temperature. The change of the insulating oil level in the oil conservator box can be judged by the state of the corrugated cover, thereby helping to correct whether the liquid level obtained by the circulation and ventilation mechanism is incorrect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0022] In the diagram: 1. Oil tank housing; 2. Corrugated hood; 3. Circulating ventilation mechanism; 31. Air blowing measuring tube; 32. Fan; 33. Air storage tank; 34. Cooling mechanism; 35. Instrument needle valve; 36. Filter pressure reducing valve; 37. Setpoint; 38. Ball valve; 39. Pressure transmitter; 310. Measuring tube buffer chamber; 311. Pressure gauge; 4. Filtration mechanism; 41. Support; 42. Filter screen. Detailed Implementation

[0023] To make the above features and advantages of the present invention more readily understood, specific embodiments are described below in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0024] Example 1 (Reference) Figure 1

[0025] A multifunctional transformer oil conservator includes an oil conservator housing 1. A circulation and ventilation mechanism 3, with inert gas circulating internally, is connected to the oil conservator housing 1. The circulation and ventilation mechanism 3 includes a measuring tube buffer chamber 310 installed outside the oil conservator housing 1. A blowing measuring tube 31 is connected to the bottom of the measuring tube buffer chamber 310, with one end extending below the oil level inside the oil conservator housing 1. A pressure transmitter 39 and a pressure gauge 311 are installed on the measuring tube buffer chamber 310. The pressure transmitter measures the air pressure inside the measuring tube buffer chamber 310 and transmits the pressure signal to the pressure gauge 311. The measuring tube buffer chamber 310 is sequentially connected to a setpoint device 37, a filter pressure reducing valve 36, an air storage tank 33, and a fan 32 via a rear air pipe. The air inlet of the fan 32 is connected to the side wall of the oil conservator housing 1 above the oil level, thereby achieving inert gas airflow circulation. A corrugated cover 2 is also installed on the oil conservator housing.

[0026] In this embodiment, the inert gas is nitrogen. Nitrogen has low production cost, stable chemical properties, and does not react with insulating oil, thus preventing the insulating oil from deteriorating.

[0027] In this embodiment, a cooling mechanism 34 for cooling the inert gas inside the gas storage tank 33 is connected to the gas storage tank 33. The cooling mechanism 34 includes a cooling coil surrounding the outer wall of the gas storage tank, and coolant circulates within the cooling coil. Thus, the cooling mechanism 34 cools the gas storage tank 33, thereby cooling the inert gas inside the gas storage tank 33, allowing the inert gas entering the oil conservator housing 1 to cool the insulating oil more quickly.

[0028] In this embodiment, a ball valve 38 is installed on the pipeline between the measuring tube buffer chamber 310 and the setter 37; an instrument needle valve 35 is installed on the pipeline between the filter pressure reducing valve 36 and the air storage tank 33.

[0029] In this embodiment, the corrugated cover 2 is a corrugated tube with a closed upper end.

[0030] In use, the inert gas in the gas storage tank 33 is filtered by the filter pressure reducing valve 36 under the action of the fan 32, and then the supply pressure is reduced to a constant value by the setter 37, so that the air inlet pressure of the measuring tube buffer chamber 310 is kept constant. The magnitude of the constant pressure depends on the height of the insulating liquid. Finally, this clean air at a constant pressure passes through the measuring tube buffer chamber 310 and is blown into the oil tank 1 through the air blowing measuring tube 31. The function of the measuring tube buffer chamber 310 is to ensure that the airflow into the measuring tube is stable and uniform. When the pressure blown into the air blowing measuring tube 31 is approximately equal to the height of the liquid level, the pressure value measured by the instrument is the height of the liquid level. When the liquid level increases, the bubbles must overcome the static pressure of the liquid column inside the blowing air measuring tube 31, causing the pressure gauge 311 to increase. Similarly, when the liquid level decreases, the bubbles must overcome the static pressure of the liquid column inside the blowing air measuring tube 31, causing the pressure gauge 311 to decrease as well. Thus, the level of insulating liquid in the oil tank 1 can be determined by referring to the parameters of the pressure gauge 311.

[0031] Meanwhile, with the continuous ventilation of the fan 32, the inert gas can circulate in the oil conservator box 1. The circulating gas can maintain the stability of the pressure in the oil conservator box 1, and the circulating gas can remove the heat in the oil conservator box 1, reduce the temperature in the oil conservator box 1, and play a role in cooling the insulating oil.

[0032] The corrugated cover 2 can expand and contract freely, thus accommodating the free change in the volume of insulating oil inside the oil conservator 1 with temperature. When the insulating oil level inside the oil conservator 1 increases, the corrugated cover 2 expands upward to ensure stable air pressure in the oil conservator 1; when the insulating oil level inside the oil conservator 1 decreases, the corrugated cover 2 contracts downward to ensure stable air pressure in the oil conservator 1; and the state of the corrugated cover 2 can be used to judge the change in the insulating oil level inside the oil conservator 1, thereby using the corrugated cover 2 to assist in correcting whether the liquid level obtained by the circulation ventilation mechanism 3 is incorrect.

[0033] Example 2 (Reference) Figure 2

[0034] Based on the above embodiment 1, a filter mechanism 4 is also provided at the bottom end of the air blowing measuring tube 31. The filter mechanism 4 includes a bracket 41 installed on the air blowing measuring tube 31, and a filter screen bag 42 sleeved on the air outlet at the lower end of the air blowing measuring tube 31 is installed on the bracket 41.

[0035] When inert gas is sprayed onto the filter screen 42 through the air blowing measuring tube 31, it can drive the surrounding liquid level to flow towards the filter screen 42, causing a vortex to be generated in the oil conservator box 1 towards the filter screen 42, thereby causing impurities in the insulating oil to be trapped by the filter screen 42, thus achieving the filtration of the insulating oil in the oil conservator box 1.

[0036] In this embodiment, an alarm mechanism is also provided on the oil conservator housing. The alarm mechanism includes a microcontroller and an alarm, and both the alarm and the pressure gauge 311 are electrically connected to the microcontroller. When the pressure value of the pressure gauge 311 reaches a preset threshold, the microcontroller drives the alarm to sound, promptly reminding the user that the oil level in the oil conservator housing 1 is low.

[0037] The working principle of this invention is as follows:

[0038] The inert gas is filtered by the filter pressure reducing valve 36 and then the supply pressure is reduced to a certain constant value by the setter 37, so that the air inlet pressure of the measuring tube buffer chamber 310 is kept constant. The magnitude of the constant pressure depends on the height of the insulating liquid. Finally, this clean and constant pressure air passes through the measuring tube buffer chamber 310 and is blown into the oil conservator box 1 through the air blowing measuring tube 31. When the pressure blown into the air blowing measuring tube 31 is approximately equal to the height of the liquid level, the pressure value measured by the instrument is the height of the liquid level, and thus the liquid level information of the oil conservator box 1 is obtained.

[0039] With the continuous ventilation of the fan 32, the inert gas can circulate in the oil conservator box 1. The circulating gas can maintain the stability of the pressure in the oil conservator box 1, and the circulating gas can remove the heat in the oil conservator box 1, reduce the temperature in the oil conservator box 1, and play a role in cooling the insulating oil.

[0040] The expansion and contraction state of the corrugated cover 2 can reflect the free change of the volume of insulating oil in the oil tank 1 with temperature. The state of the corrugated cover 2 can be used to judge the change of the insulating oil level in the oil tank 1, thereby using the corrugated cover 2 to help correct whether the liquid level obtained by the circulation ventilation mechanism 3 is incorrect.

[0041] The above description is only a preferred embodiment of the present invention. For those skilled in the art, designing different forms of multifunctional transformer oil conservators does not require creative labor based on the teachings of the present invention. All equivalent changes, modifications, substitutions and variations made in accordance with the scope of the patent application of the present invention without departing from the principles and spirit of the present invention shall be covered by the present invention.

Claims

1. A multifunctional transformer oil conservator, comprising an oil conservator housing, characterized in that, The oil conservator housing is connected to a circulating ventilation mechanism with inert gas as the internal circulating gas. The circulating ventilation mechanism includes a measuring tube buffer chamber installed outside the oil conservator housing. A blowing measuring tube is connected to the bottom of the measuring tube buffer chamber, with one end extending below the oil level inside the oil conservator housing. A pressure transmitter and pressure gauge are installed on the measuring tube buffer chamber. The measuring tube buffer chamber is connected in sequence to a setter, a filter pressure reducing valve, an air tank, and a blower via a back air pipe. The blower's air inlet is connected to the side wall of the oil conservator housing above the oil level. A corrugated hood is also installed on the oil conservator housing. A ball valve is installed on the pipeline between the measuring tube buffer chamber and the setter. An instrument needle valve is installed on the pipeline between the filter pressure reducing valve and the gas storage tank; a cooling mechanism is connected to the gas storage tank for cooling the inert gas inside the tank; the cooling mechanism includes a cooling coil surrounding the outer wall of the gas storage tank, and coolant circulates within the cooling coil; a filter mechanism is also installed at the bottom end of the air blowing measuring tube; the filter mechanism includes a bracket installed on the air blowing measuring tube, and a filter screen is installed on the bracket and fitted onto the lower air outlet of the air blowing measuring tube; an alarm mechanism is also installed on the oil conservator housing; the alarm mechanism includes a microcontroller and an alarm, and the alarm and pressure gauge are both electrically connected to the microcontroller.

Images