A transformer oil injection system and method

Abstract

The application discloses a transformer oil injection system and method, which comprises a non-contact pressurized oil tank with a built-in flexible air bag and a double-path gas regulating and supplying system. Clean regulating gas is injected into the external pressurized cavity of the flexible air bag to pressurize the insulating oil in the air bag into the transformer in a non-contact manner, so that gas dissolution pollution is fundamentally avoided. Meanwhile, the same clean regulating gas source is used to accurately regulate and diagnose the air chamber of the corrugated pipe oil tank of the transformer through a second path, so that the risk of secondary pollution caused by introduction of atmosphere is eliminated. The system also integrates a pressure equalization function of synchronous vacuum extraction of oil paths and gas paths to protect the corrugated pipe. The application can realize efficient, safe and pollution-free on-site oil injection of the transformer, and significantly improves the insulation reliability and equipment operation life.

Description

Technical Field

[0001] This invention relates to the field of transformer oil filling systems, and more specifically to a transformer oil filling system and method. Background Technology

[0002] As a pivotal piece of equipment in the power grid, the long-term stable operation of transformers is crucial. Insulating oil plays a dual role in transformers, serving both insulation and cooling functions; its purity and electrical properties directly determine the equipment's safety margin and service life. Therefore, vacuum oil injection is commonly used when filling large and medium-sized oil-immersed transformers. This process involves injecting deeply treated insulating oil into the transformer under high vacuum to remove as much solid insulation and trace amounts of moisture and dissolved gases as possible, thereby achieving optimal overall insulation performance.

[0003] With increasing demands for efficiency in on-site operations, several technologies have emerged in the industry aimed at accelerating the oil injection process. One common method involves pre-treating the insulating oil through degassing and purification, then filling the storage tank with a high-pressure inert gas (such as nitrogen). The gas pressure directly acts on the oil surface, forcing it at high speed into the vacuum-sealed transformer tank. However, this efficiency-driven approach introduces a significant technical hazard: according to Henry's Law, the higher the gas pressure applied to the liquid surface, the greater the solubility of that gas in the liquid. This means that the gas painstakingly removed in the previous step will dissolve back into the insulating oil during this pressurized oil injection process. After the transformer is put into operation, these redissolved gases may re-precipitate due to changes in temperature, pressure, and other operating conditions, forming microbubbles. Under a strong electric field, these microbubbles can become weak points in the insulation, posing a potential threat to the long-term reliability of the equipment.

[0004] Furthermore, to accommodate the thermal expansion and contraction of the oil tank and to completely isolate it from the atmosphere, some modern large transformers employ fully sealed oil conservators with precision metal bellows. These bellows are designed as flexible components with good elasticity and relatively thin walls, making them highly sensitive to large pressure differences. During the preparation stage for vacuum oil filling, the inner cavity (oil circuit side) of the bellows, which connects to the transformer tank, needs to be evacuated. In traditional processes, the outside of the bellows (atmospheric side) is usually maintained at a standard atmospheric pressure at this time. This creates a huge, uneven pressure difference of nearly 0.1 MPa between the inside and outside of the bellows' thin wall. This unidirectional pressure is sufficient to cause excessive stretching of the bellows, resulting in irreversible plastic deformation or even breakage, thus causing it to lose its normal volume compensation function and seriously affecting the safe operation of the transformer.

[0005] Therefore, in the current field of transformer on-site oil filling technology, there exists a pair of mutually restrictive technical challenges: on the one hand, common methods for pursuing oil filling efficiency may come at the cost of sacrificing the ultimate purity of the oil; on the other hand, the vacuum process for ensuring oil quality may pose a risk of physical damage to the transformer's precision components. How to achieve efficient oil delivery in a single complete oil filling operation, ensure that the oil is not subject to secondary contamination at any stage, and safely adapt to all types of transformer structures has become a key technology urgently needing improvement and refinement in this field. Summary of the Invention

[0006] The purpose of this invention is to provide a transformer oil injection system and method, which aims to solve the problem that it is difficult to completely avoid secondary pollution and operational damage in the entire transformer oil injection process in the prior art.

[0007] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution: A transformer oil filling system, wherein the transformer has a bellows oil conservator, the oil filling system comprising: A pressurized oil storage tank includes a rigid outer shell and a flexible air bladder disposed inside the rigid outer shell. The flexible air bladder divides the interior of the pressurized oil storage tank into an oil storage chamber for storing insulating oil and a pressurized chamber located between the flexible air bladder and the rigid outer shell. Gas conditioning and supply system, used to generate and supply treated conditioning gas; The vacuum conditioning system is used to evacuate the oil storage chamber, the air chamber of the bellows oil tank, and the oil tank of the transformer. The main controller is used to control the operation of the system. The gas regulation and supply system has at least two independent output paths controlled by the main controller. The first output path is connected to the pressurization chamber and is used to input regulating gas into the pressurization chamber to squeeze the flexible airbag for oil delivery. The second output path is connected to the air chamber of the bellows oil tank.

[0008] Furthermore, the gas conditioning and supply system includes: A high-purity nitrogen source; A gas conditioning unit connected to a high-purity nitrogen source for removing moisture and impurities from the high-purity nitrogen source to form a conditioning gas; and, A gas path control valve assembly connected to a gas regulating unit is used to distribute regulating gas to the first and second output paths and can independently regulate the flow rate or pressure of each output path.

[0009] Furthermore, the oil injection system also includes a return gas path connecting the pressurization chamber and the gas regulating unit inlet. A first solenoid valve controlled by the main controller is installed on the return gas path, and a one-way valve is also installed on the return gas path between the first solenoid valve and the gas regulating unit inlet.

[0010] Furthermore, it also includes a high-efficiency oil filter, whose oil outlet is connected to the inlet of the oil storage chamber, and a second solenoid valve and a third solenoid valve controlled by the main controller are respectively installed at the inlet and outlet of the oil storage chamber.

[0011] Furthermore, it also includes: Pressure sensors installed in the pressurization chamber, oil storage chamber, transformer oil tank, and bellows oil conservator gas chamber; and, Oil level sensors are installed in the oil storage chamber and transformer oil tank; All pressure and oil level sensors are connected to the main controller for automated closed-loop control.

[0012] Furthermore, the vacuum conditioning system includes: A negative pressure generating mechanism; and, An adjustable proportional valve assembly connects the negative pressure generating mechanism to the oil storage chamber, the transformer's oil tank, and the air chamber of the bellows oil conservator, respectively.

[0013] Furthermore, the bellows oil tank has a breather that connects to its air chamber, and the second output path of the gas regulation and supply system is connected to the breather.

[0014] Furthermore, a fourth solenoid valve controlled by the main controller is installed between the high-purity nitrogen source and the gas regulating unit.

[0015] Furthermore, it also includes a mobile platform on which the pressurized oil storage tank, gas regulation and supply system, vacuum regulation system and main controller are all mounted.

[0016] A method for filling a transformer oil filling system includes the following steps: S1, Pretreatment and Vacuum Equalization: The vacuum regulation system is turned on to simultaneously evacuate the oil tank and the air chamber of the bellows oil conservator of the transformer until the preset vacuum level is reached, so as to deeply dehydrate and degas the transformer and achieve pressure equalization. S2, Oil storage chamber filling and gas recovery: Insulating oil treated by a high-efficiency oil filter is injected into the oil storage chamber. During the expansion of the flexible airbag by the oil, the first solenoid valve controlled by the main controller is opened, and the regulating gas in the pressurization chamber is recovered to the gas regulation and supply system through the one-way valve on the return gas path. S3, pressurized oil delivery and synchronous support: Regulating gas is injected into the pressurized chamber through the first output path to compress the flexible airbag and pressurize the insulating oil into the transformer's oil tank; when dealing with large or structurally sensitive transformers, regulating gas is injected synchronously into the air chamber of the bellows oil conservator through the second output path to dynamically support the bellows at a preset pressure, preventing damage caused by oil impact. S4, Precision Adjustment and Diagnosis: After the oil is filled to the predetermined state, the air chamber of the bellows oil conservator is precisely vented or evacuated through the second output path and / or vacuum adjustment system to fine-tune the transformer oil level or perform live-line diagnosis.

[0017] The beneficial effects of this invention are: 1. Achieves pollution-free oil injection throughout the entire process, significantly improving insulation reliability. This invention utilizes a non-contact pressurized oil storage tank with a built-in flexible air bladder, using gas pressure to compress the air bladder for oil delivery. This core design fundamentally eliminates the possibility of direct contact between the oil delivery motive gas (such as nitrogen) and the insulating oil, avoiding the problem of gas redissolving in the oil under pressure and causing a decrease in insulation performance. This ensures that the oil injected into the transformer has the highest chemical purity and electrical insulation strength.

[0018] 2. Secondary contamination during adjustment and diagnosis is eliminated, ensuring the integrity of the vacuum environment. This invention establishes a dual-path clean gas adjustment and supply system, using the same pure gas source. It can be used for both high-power oil transfer and fine adjustment and diagnosis of the bellows oil conservator. This completely avoids the risk of introducing untreated atmosphere (containing moisture and impurities) into the high vacuum system for oil level adjustment or testing, as is common in existing technologies. This protects the results of the entire oil filling process and ensures the long-term safe and stable operation of the transformer.

[0019] 3. Enhanced protection for the transformer body and improved operational safety. This invention integrates a vacuum regulation system capable of simultaneously evacuating the oil circuit side and the atmospheric side. This maintains pressure balance inside and outside the bellows during the initial stage of vacuuming, effectively preventing permanent damage to this precision component caused by large pressure differences. Simultaneously, synchronous pneumatic support is provided during pressurized oil delivery, further reducing operational shock and comprehensively improving the safety protection level for expensive transformer equipment. Attached Figure Description

[0020] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the oil injection system of the present invention.

[0022] The labels in the diagram represent the following: 1-Transformer; 1a-Oil inlet; 1b-Vacuum interface; 2-Corrugated oil tank; 2a-Breathing port; 2b-Gas chamber interface; 3-Rigid outer shell; 4-Flexible airbag; 5-Oil storage chamber; 6-Pressure chamber; 7-High-purity nitrogen source; 8-Gas regulating unit; 9-Negative pressure generating mechanism; 10-Moving platform; 11-Gas path control valve group; 12-Adjustable proportional valve group; 13-Fourth solenoid valve; 14-Third solenoid valve; 15-First solenoid valve; 16-Second solenoid valve. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Reference Figure 1 In this embodiment, the oil injection system shown integrates all its core components onto a mobile platform 10 for easy movement and deployment. A key feature of the system is its specialized pressurized oil storage tank, which consists of a robust rigid shell 3 and a flexible air bladder 4 housed within the rigid shell 3. The flexible air bladder 4 is made of a high-performance, chemically inert material that is oil-resistant and pressure-resistant, ensuring compatibility with insulating oil and long-term reliability. This structure cleverly divides the interior of the pressurized oil storage tank into two completely isolated spaces: an oil storage chamber 5 enclosed by the flexible air bladder 4 for storing pure insulating oil, and a pressurized chamber 6 located between the flexible air bladder 4 and the rigid shell 3. To achieve precise control of the insulating oil's entry and exit from the oil storage chamber 5, a second solenoid valve 16 and a third solenoid valve 14 are installed at the inlet and outlet of the oil storage chamber 5, respectively. The outlet of the oil storage chamber 5 is connected to the oil inlet 1a of the transformer 1. Their switching actions are precisely controlled by the system's central controller. Before being allowed to enter the oil storage chamber 5, the insulating oil must pass through a high-efficiency oil filter, which can deeply remove trace amounts of moisture, gas and solid impurities from the oil. Its outlet is connected to the inlet of the oil storage chamber 5 and the second solenoid valve 16, ensuring that the oil entering the oil storage chamber 5 has extremely high cleanliness.

[0025] Another core feature of the system is its sophisticated gas regulation and supply system, crucial for achieving pollution-free oil transportation and precise regulation. This system comprises a high-purity nitrogen source 7, a fourth solenoid valve 13 controlled by the main controller as the main intake switch, a gas regulation unit 8 connected to the fourth solenoid valve 13, and a gas path control valve group 11. The fourth solenoid valve 13 allows the main controller to completely cut off the supply of high-purity nitrogen at the source when the system is in standby mode or performing specific processes (such as overall vacuuming), ensuring system operational safety and the tightness of process isolation. The gas regulation unit 8 is responsible for the final drying and filtration of the high-purity nitrogen from the gas source to form a clean, dry regulating gas. The gas path control valve assembly 11 receives instructions from the main controller and precisely distributes the processed regulating gas to at least two independent output paths. The first output path is connected to the pressurization chamber 6, used to input regulating gas into the pressurization chamber 6 to compress the flexible airbag 4 for oil delivery. The second output path is connected to the air chamber of the bellows oil reservoir 2 (usually connected to the breather port 2a). The gas path control valve assembly 11 possesses high-precision proportional regulation capabilities. This proportional regulation capability plays a crucial role in both paths. This proportional control capability plays a synergistic role in several key aspects of the system. For example, during the "pressurized oil delivery and synchronous support" step, regulating gas needs to be simultaneously delivered to the large pressurized chamber 6 and the relatively small bellows chamber. It is precisely because of this "proportional control" that the main controller can dynamically and asymmetrically adjust the opening of the two proportional valves leading to these two chambers by real-time monitoring of the pressure at three key locations: the pressurized chamber 6, the bellows chamber, and the transformer 1 tank, based on a complex synergistic control algorithm.

[0026] For example, the controller can set a target, namely, to reduce the support pressure P in the air chamber. 气室 Always maintain at a preset ratio (e.g., at the main oil delivery pressure P) 加压腔 The pressure rises smoothly, between 10% and 20%, following the upward curve of the main oil supply pressure in pressurizing chamber 6. When the controller detects that the pressure in the air chamber is rising too quickly, it immediately reduces the valve opening to the air chamber; when it detects that the pressure in pressurizing chamber 6 is insufficient, it increases the valve opening to pressurizing chamber 6. This intelligent and coordinated pressure building capability ensures that the support force on the bellows is timely and effective without being excessive, representing a high level of protection for precision components during dynamic processes.

[0027] The gas system in this embodiment also includes a return gas path connecting the pressurization chamber 6 and the inlet of the gas regulating unit 8. This path is equipped with a first solenoid valve 15 and a mechanical one-way valve. When oil is injected into the oil storage chamber 5, causing the flexible airbag 4 to inflate, the clean regulating gas displaced in the pressurization chamber 6 can be safely and unidirectionally recovered to the inlet of the gas regulating unit 8 through this path, achieving the recycling of valuable gas.

[0028] In addition, the system includes a powerful vacuum regulation system consisting of a high-performance negative pressure generating mechanism 9 and an adjustable proportional valve assembly 12. This valve assembly has multiple output channels, connected to the oil storage chamber 5, the vacuum port 1b of the transformer 1 oil tank, and the air chamber port 2b of the bellows oil conservator 2, respectively. Since the volume of the transformer 1 oil tank is typically much larger than the volume of the air chamber of the bellows oil conservator 2, using only two simple on / off valves for synchronous vacuuming would inevitably lead to a much faster pressure drop in the smaller air chamber than in the oil tank, thus creating a new and dangerous pressure differential inside and outside the bellows, which contradicts the original design intent.

[0029] To address this technical challenge, the adjustable proportional valve assembly 12 in this embodiment, along with the pressure sensors located in the oil tank and air chamber, and the main controller, constitutes a sophisticated closed-loop control system. When executing the pressure equalization vacuuming command, the main controller acquires signals from the two pressure sensors in the oil tank and air chamber in real time and at high frequency, and runs a dynamic balancing algorithm to continuously compare their pressure values. If the algorithm detects the pressure P in the air chamber... 气室 The descent speed exceeded the pressure P in the oil tank. 油箱 When the descent rate increases, the controller immediately reduces the opening of the proportional valve connected to the air chamber to throttle its pumping speed; conversely, if the pressure drop in the oil tank is delayed, the controller increases the opening of the proportional valve connected to the oil tank to increase its pumping speed.

[0030] By using real-time pressure feedback to dynamically and asymmetrically adjust the opening of the two valves at the microsecond level, the system can force the pressure drop curves of the two chambers with different volumes to almost completely overlap. Thus, during the entire vacuuming process, the pressure difference inside and outside the bellows is always controlled within a very small and absolutely safe range. It elevates the simple "synchronous action" to intelligent "synchronous balancing", which is a key technical guarantee for achieving high-level protection of the precision components of transformer 1.

[0031] The entire system operates with automation and intelligence thanks to the main controller. This main controller is tightly connected to a sensor network distributed throughout the system. This network includes pressure sensors located in the pressurization chamber 6, oil storage chamber 5, transformer 1 oil tank, and the air chamber of the bellows oil conservator 2, as well as oil level sensors located in oil storage chamber 5 and transformer 1 oil tank. The controller analyzes the pressure and oil level data fed back from these sensors in real time and, based on a pre-set complex algorithm, performs closed-loop control on all solenoid valves in the system, such as the first, second, third, and fourth solenoid valves, the gas path control valve group 11, and the adjustable proportional valve group 12, thereby automatically, orderly, and safely completing the entire oil injection and regulation process.

[0032] Based on the above system, the present invention also provides an oil injection method: First, step S1, namely pretreatment and vacuum equalization, is executed: At this time, the main controller turns on the vacuum regulation system and precisely adjusts its adjustable proportional valve group 12, so that the two vacuum channels connecting the oil tank of transformer 1 and the gas chamber of the bellows oil conservator 2 are opened simultaneously, and the two isolated chambers are evacuated synchronously until the system pressure reaches the preset vacuum degree between -0.08MPa and -0.099MPa. This not only deeply dehydrates and degasses the insulation of transformer 1, but also cleverly achieves pressure equalization protection for the bellows.

[0033] After vacuum treatment, the process proceeds to step S2, which involves filling the oil storage chamber 5 with oil and recovering the gas. At this point, the main controller closes all valves connected to transformer 1 and opens the second solenoid valve 16 connected to the high-efficiency oil filter, pumping pure insulating oil into the flexible air bladder 4 of the oil storage chamber 5. As the flexible air bladder 4 expands due to the oil, the controller simultaneously opens the first solenoid valve 15 on the return gas path, allowing the clean regulating gas squeezed out of the pressurization chamber 6 to be safely recovered into the gas regulation and supply system via a one-way valve. Once the oil storage chamber 5 is full, the second and first solenoid valves 15 are closed.

[0034] Next, step S3, namely pressurized oil delivery and synchronous support, is executed: the controller opens the third solenoid valve 14 at the outlet of the oil storage chamber 5 and the first output path of the gas system, and clean regulating gas flows into the pressurization chamber 6, forcefully squeezing the flexible air bag 4, and pressing the insulating oil into the transformer 1 oil tank, which is already in a vacuum state, in a non-contact manner; during this process, especially when dealing with large or structurally sensitive transformers 1, the controller can also selectively open the second gas output path to synchronously inject a small amount of regulating gas into the air chamber of the bellows oil conservator 2 to form a dynamic support back pressure and prevent the instantaneous impact of the oil from damaging the bellows.

[0035] Once the oil level approaches the target, the final S4 step, namely precision adjustment and diagnosis, is initiated. At this point, the oil supply operation stops, and the controller will precisely charge or evacuate the bellows chamber through the second gas output path and / or the vacuum regulation system, thereby changing the expansion and contraction state of the bellows and achieving millimeter-level fine adjustment of the final oil level of transformer 1, or performing pressurized sealing diagnosis by applying stable pressure.

[0036] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered as falling within the scope of protection of the embodiments of the present invention.

Claims

1. A transformer oil filling system, wherein the transformer (1) has a bellows oil conservator (2), characterized in that, The oil injection system includes: A pressurized oil storage tank, the pressurized oil storage tank including a rigid shell (3) and a flexible air bladder (4) disposed inside the rigid shell (3), the flexible air bladder (4) dividing the interior of the pressurized oil storage tank into an oil storage chamber (5) for storing insulating oil and a pressurized chamber (6) located between the flexible air bladder (4) and the rigid shell (3). Gas conditioning and supply system, used to generate and supply treated conditioning gas; A vacuum regulation system is used to evacuate the oil storage chamber (5), the air chamber of the bellows oil tank (2), and the oil tank of the transformer (1); The main controller is used to control the operation of the system; The gas regulation and supply system has at least two independent output paths controlled by the main controller. The first output path is connected to the pressurization chamber (6) and is used to input the regulating gas into the pressurization chamber (6) to squeeze the flexible airbag (4) for oil delivery. The second output path is connected to the air chamber of the bellows oil tank (2).

2. The transformer oil injection system according to claim 1, characterized in that, The gas conditioning and supply system includes: A high-purity nitrogen source (7); A gas conditioning unit (8) connected to the high-purity nitrogen source (7) for removing moisture and impurities from the high-purity nitrogen source (7) to form the conditioning gas; and, A gas path control valve group (11) connected to the gas regulating unit (8) is provided for distributing the regulating gas to the first and second output paths and is capable of independently regulating the flow rate or pressure of each output path.

3. A transformer oil injection system according to claim 2, characterized in that, The oil injection system also includes a return gas path connecting the pressurization chamber (6) and the inlet of the gas regulating unit (8). A first solenoid valve (15) controlled by the main controller is provided on the return gas path. A one-way valve is also provided on the return gas path between the first solenoid valve (15) and the inlet of the gas regulating unit (8).

4. The transformer oil injection system according to claim 1, characterized in that, It also includes a high-efficiency oil filter, whose oil outlet is connected to the inlet of the oil storage chamber (5), and a second solenoid valve (16) and a third solenoid valve (14) controlled by the main controller are respectively provided at the inlet and outlet of the oil storage chamber (5).

5. A transformer oil injection system according to claim 1, characterized in that, Also includes: Pressure sensors are installed in the pressurization chamber (6), the oil storage chamber (5), the transformer (1) oil tank, and the bellows oil tank (2) gas chamber; and, Oil level sensors are installed in the oil storage chamber (5) and the oil tank of the transformer (1); All of the pressure sensors and oil level sensors are connected to the main controller for signal transmission to achieve automated closed-loop control.

6. A transformer oil injection system according to claim 1, characterized in that, The vacuum conditioning system includes: A negative pressure generating mechanism (9); and, An adjustable proportional valve group (12) connects the negative pressure generating mechanism (9) to the oil storage chamber (5), the oil tank of the transformer (1), and the air chamber of the bellows oil storage tank (2), respectively.

7. A transformer oil injection system according to claim 2, characterized in that, The bellows oil tank (2) has a vent that connects to its air chamber, and the second output path of the gas regulation and supply system is connected to the vent.

8. A transformer oil injection system according to claim 1, characterized in that, A fourth solenoid valve (13) controlled by the main controller is provided between the high-purity nitrogen source (7) and the gas regulating unit (8).

9. The transformer (1) oil injection system according to any one of claims 1 to 7, characterized in that, It also includes a mobile platform (10), on which the pressurized oil storage tank, the gas regulation and supply system, the vacuum regulation system and the main controller are all mounted.

10. An oil injection method based on the oil injection system of the transformer (1) according to claim 3, characterized in that, Includes the following steps: S1, Pre-treatment and vacuum equalization: The vacuum regulation system is turned on to simultaneously evacuate the oil tank of the transformer (1) and the air chamber of the bellows oil tank (2) until the preset vacuum level is reached, so as to deeply dehydrate and degas the transformer (1) and achieve pressure equalization. S2, Oil storage chamber (5) oil injection and gas recovery: Insulating oil treated by the high-efficiency oil filter is injected into the oil storage chamber (5). During the expansion of the flexible air bag (4) by the oil, the first solenoid valve (15) controlled by the main controller is opened, and the regulating gas in the pressurization chamber (6) is recovered to the gas regulation and supply system through the one-way valve on the return gas path. S3, pressurized oil delivery and synchronous support: Regulating gas is injected into the pressurized chamber (6) through the first output path to squeeze the flexible airbag (4) and pressurize the insulating oil into the oil tank of the transformer (1); when dealing with large or structurally sensitive transformers (1), regulating gas is injected into the air chamber of the bellows oil tank (2) through the second output path to dynamically support the bellows at a preset pressure to prevent damage caused by oil impact; S4, Precision Adjustment and Diagnosis: After the oil is filled to the predetermined state, the air chamber of the bellows oil tank (2) is precisely filled or evacuated through the second output path and / or the vacuum adjustment system to fine-tune the oil level of the transformer (1) or perform on-line diagnosis.

Images