Main transformer electrified oil supplementing device and use method

Abstract

The invention discloses a main transformer live-line oil supplementing device and a using method, and relates to the technical field of transformer maintenance. Comprising a main oil tank; and the mounting unit comprises an oil supplementing pipeline arranged on one side of the main oil tank, a vacuum pressure tank and a communicating pipeline. According to the device, an oil pump is not adopted, the condition of oil flow pulsation at an outlet of the oil pump is eliminated, compensation oil flow is gently'wading 'into the transformer, vacuumizing treatment is carried out before transformer oil is injected into a body, bubbles and possibly existing moisture in the oil are removed, dry compressed air is used as a pressure source, and when the transformer oil is injected into a main oil tank 100, the oil flow is continuously waded into the main oil tank 100. The speed can be controlled by the pressure of compressed air, the constant speed and stability in the transformer oil injection process are guaranteed, the situation that the transformer oil carries static electricity is avoided, the vacuum pressure tank is higher than the main oil valve, gas dead angles in pipelines are prevented from being formed, and the transformer oil enters the device and is injected into the transformer through two pipelines which are relatively closed and isolated. And treatment of the transformer oil is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of transformer maintenance, and in particular to a live oil replenishing device for a main transformer and a use method thereof. Background Art

[0002] Transformer oil plays an important role in insulation. It can fill the gaps inside the transformer, enhance the insulation strength, and prevent short circuits between windings and between windings and the core. When the oil level drops, the oil-immersed insulation may lose the protection of the oil, the insulation strength drops rapidly, and electrical failures are prone to occur. By replenishing oil, transformer accidents can be prevented and the safe and reliable operation of the transformer can be ensured.

[0003] The traditional way of replenishing oil is to first connect the pipeline to the valve at the bottom of the main transformer, connect the oil pump to the pipeline, and connect the other side of the oil pump to the transformer oil. This way of replenishing oil has two disadvantages. First, the air bubbles in the pipeline take too long to be discharged, and the exhaust is not complete; second, the oil flow of the motor oil pump has pulsation, and the oil supply pressure cannot be controlled stably, and the oil supply is not stable. If the motor speed is too high, the oil flow will rub against the pipe wall sharply, causing the oil flow to carry static electricity. The oil flow with static electricity will cause transformer failure. Summary of the invention

[0004] In view of the above problems existing in the existing live oil replenishing device for main transformer, the present invention is proposed.

[0005] Therefore, the present invention provides a live oil replenishing device for a main transformer, the purpose of which is to solve the problems of long air bubble discharge time in the pipeline, incomplete exhaust and unstable live oil supply.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: including a main oil tank; an installation unit, including an oil replenishment pipeline, a vacuum pressure tank and a connecting pipeline arranged on one side of the main oil tank, the vacuum pressure tank is respectively connected to the oil replenishment pipeline and the connecting pipeline, and the other end of the oil replenishment pipeline is connected to the main oil tank.

[0007] As a preferred solution of the main transformer live oil replenishment device described in the present invention, the oil replenishment pipeline includes a main oil valve and an oil collecting valve, the oil replenishment pipeline is connected to the main oil tank through the main oil valve, and the oil replenishment pipeline is connected to the oil collecting tank through the oil collecting valve.

[0008] As a preferred solution of the live oil replenishing device for the main transformer of the present invention, an oil storage space is provided in the oil collecting tank, and the flow rate of the oil from the oil collecting tank to the vacuum pressure tank is controlled by the oil collecting valve.

[0009] As a preferred solution of the live oil replenishing device for the main transformer of the present invention, the vacuum pressure tank comprises a pressure gauge and a bracket, which are respectively arranged at the upper and lower parts of the vacuum pressure tank.

[0010] As a preferred solution of the live oil replenishing device for the main transformer of the present invention, the bracket is arranged at the lower part of the vacuum pressure tank, and the vacuum pressure tank is located at a higher height than the main oil valve.

[0011] As a preferred solution of the main transformer live oil replenishing device described in the present invention, the communicating pipeline includes a vacuum valve and an air pressure valve, the communicating pipeline is connected to the vacuum pump through the vacuum valve, and the communicating pipeline is connected to the air compressor through the air pressure valve.

[0012] The beneficial effects of this device are as follows: no oil pump is used, and the pulsation of oil flow at the oil pump outlet is eliminated. The supplementary oil flow "wades" smoothly into the transformer. Before the transformer oil is injected into the main body, a vacuum treatment is performed to remove bubbles and possible moisture in the oil. Dry compressed air is used as a pressure source to control the speed of transformer oil injection into the main oil tank 100. This ensures a uniform and stable injection process of the transformer oil and prevents the transformer oil from being electrostatically charged. The height of the vacuum pressure tank is higher than the main oil valve to prevent the formation of gas dead corners in the pipeline. The transformer oil entry device and the process of injecting into the transformer are two relatively closed and isolated pipelines, which is convenient for the treatment of the transformer oil.

[0013] Another object of the present invention is to provide a method for using live oil replenishment in a main transformer, the purpose of which is to replenish oil without bubbles into a main oil tank.

[0014] In order to solve the above technical problems, the present invention provides the following technical solutions: in the preparation stage, close all valves, start the valve of the vacuum pump and observe the value of the pressure gauge, and close the valve of the vacuum pump after reaching 133pa;

[0015] During the oil filling stage, open the oil collecting valve, fill the vacuum pressure tank with oil, and maintain the pressure at or below 133Pa;

[0016] During the live oil replenishment stage, turn off the vacuum pump, start the air compressor to pressurize the upper space of the vacuum pressure tank, and press the oil in the vacuum pressure tank into the main oil tank.

[0017] As a preferred scheme of the method for using live oil replenishment of the main transformer described in the present invention, the preparation stage includes closing the main oil valve, the oil collecting valve, the air pressure valve, opening the vacuum valve, starting the vacuum pump, evacuating the vacuum pressure tank, the oil replenishment pipeline, and the connecting pipeline, and monitoring the pressure through a pressure gauge until the vacuum degree reaches 133 Pa or below.

[0018] As a preferred scheme of the method for using live oil replenishment of the main transformer described in the present invention, the oil filling stage includes: when the vacuum degree reaches 133Pa or below, opening the oil collecting valve, and the oil flowing from the oil collecting tank through the oil collecting valve and the oil replenishment pipeline into the vacuum pressure tank until the oil level reaches 3 / 4 of the vacuum pressure tank, closing the oil collecting valve, and maintaining a pressure of 133Pa or below to accelerate the precipitation of bubbles in the oil and extract the water that may be contained in the oil.

[0019] As a preferred embodiment of the method for using live oil replenishment of the main transformer of the present invention, the live oil replenishment stage includes closing the vacuum valve to exit the operation of the vacuum pump, starting the air compressor and opening the air pressure valve, pressurizing the upper space of the vacuum pressure tank, and when the pressure value is maintained at a certain value higher than the internal pressure of the transformer, opening the main oil valve, using the pressure generated by the air compressor to pressurize the oil in the vacuum pressure tank into the main oil tank, when the oil level of the vacuum pressure tank drops to 1 / 3, quickly closing the main oil valve, cutting off the air compressor and closing the air pressure valve, and repeating the steps of the preparation stage and the oil filling stage until the oil level of the transformer reaches the specified position.

[0020] The beneficial effects of the present invention are as follows: simplifying the operation process, improving the working efficiency and fault tolerance during the oil replenishment process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the overall structural flow of the live oil replenishing device for the main transformer of the present invention.

[0023] Figure 2 It is a schematic diagram of the overall structural flow of the installation unit in the live oil replenishment device for the main transformer of the present invention. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0027] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0028] Example 1, reference Figure 1 - Figure 2 , which is the first embodiment of the present invention, provides a main transformer live oil replenishing device, including an oil replenishing pipeline 201 connecting the vacuum pressure tank 202 and the main oil tank 100, which is a channel for oil flow, and smoothly transports the treated oil to the main oil tank 100 to ensure smooth oil flow, reduce oil flow pulsation, and avoid the generation of bubbles and moisture in the oil. The vacuum pressure tank 202 is the core component of the oil replenishing system, which is used to store and process transformer oil, and removes bubbles and moisture in the oil during the vacuuming process to ensure the purity of the oil.

[0029] Furthermore, the bracket 202b is arranged at the lower end of the vacuum pressure tank 202 to provide structural support so that the vacuum pressure tank 202, pipelines and other components are maintained in the correct position and angle. The position of the vacuum pressure tank 202 is higher than the main oil valve 201a, so that when the oil is sucked into the vacuum pressure tank 202 from the oil collecting tank 201c, there will be no dead corner of the oil replenishment pipeline 201 where air is accumulated and cannot be removed. The pressure gauge 202a is arranged at the upper end of the vacuum pressure tank 202 to monitor the pressure in the vacuum pressure tank 202 and display the pressure reading so that the operator can judge the effect of vacuuming and ensure that the vacuuming reaches a predetermined vacuum degree.

[0030] Among them, the main oil valve 201a controls the oil to flow from the oil collecting tank 201c into the vacuum pressure tank 202, controls the oil flow during the oil replenishment process, accurately controls the oil volume, and prevents excessive or insufficient oil. It is connected to the oil replenishment pipeline 201. The oil collecting tank 201c stores the transformer oil to be replenished and serves as a temporary storage point for the oil. The oil inflow is controlled by the main oil valve 201a, which facilitates the management and replenishment of the oil.

[0031] Furthermore, the connecting pipeline 203 connects the vacuum pressure tank 202, the air compressor 203d and the vacuum pump 203c. The oil replenishing pipeline 201 and the connecting pipeline 203 use a transparent hose with a steel wire to facilitate observation of the flow of the oil and whether there are bubbles in the oil. The air compressor 203d provides compressed air as a pressure source to press the oil into the main oil tank 100, generating compressed air with a pressure higher than the internal pressure of the transformer to promote the flow of the oil. The vacuum pump 203c is used to evacuate and remove gas and moisture in the oil. The oil is degassed and dehydrated before replenishing the oil to improve the purity of the oil and reduce gas bubbles and moisture inside the transformer. The vacuum pump 203c uses an oil-free vacuum pump 203c to prevent the air compressor 203d oil of the oil-containing vacuum pump 203c from being sucked into the transformer oil due to the negative pressure in the vacuum pressure tank 202 after the vacuum pump 203c suddenly loses power.

[0032] Among them, the vacuum valve 203a controls the working state of the vacuum pump 203c, turns on or off the vacuum pump 203c, controls the vacuuming process, ensures that the vacuum degree meets the requirements, and provides conditions for the degassing and dehydration of the oil. The air pressure valve 203b controls the compressed air generated by the air compressor 203d, releases the compressed air when needed, promotes the flow of oil, and controls the injection pressure and speed of the oil.

[0033] Example 2, reference Figure 1 - Figure 2 , which is the second embodiment of the present invention, and which is different from the first embodiment in that:

[0034] Step (1): evacuate the vacuum pressure tank 202, the oil replenishing pipeline 201, and the connecting pipeline 203 to remove the air inside the vacuum pressure tank 202, the oil replenishing pipeline 201, and the connecting pipeline 203, thereby creating conditions for the subsequent oil injection and oil replenishing process.

[0035] First, close the main oil valve 201a, the oil collecting valve 201b and the air pressure valve 203b to ensure the system is sealed, open the vacuum valve 203a, start the vacuum pump 203c, evacuate the vacuum pressure tank 202, the oil replenishment pipeline 201 and the connecting pipeline 203, monitor the pressure change through the pressure gauge 202a, and stop evacuating when the pressure drops to 133Pa or below. 133Pa is the evaporation pressure point of water at room temperature. This pressure value can ensure that the air is extracted and the water can also be vaporized and extracted.

[0036] Step (2): Fill the vacuum pressure tank 202 with oil and evacuate it. In a vacuum state, inject oil into the vacuum pressure tank 202 and remove bubbles and moisture in the oil.

[0037] When the internal pressure of the vacuum pressure tank 202 reaches 133Pa or below, open the oil collecting valve 201b, and the oil flows into the vacuum pressure tank 202 from the oil collecting tank 201c to control the oil level: when the oil level reaches 3 / 4 of the vacuum pressure tank 202, close the oil collecting valve 201b, and reserve 1 / 4 of the space for subsequent vacuuming and pressurization, and continue to vacuumize to 133Pa or below to accelerate the precipitation and extraction of bubbles in the oil and remove moisture from the oil.

[0038] Step (3): refill the main oil tank 100 with oil under power supply, and refill the treated transformer oil into the main oil tank 100 smoothly and safely when the transformer is in operation.

[0039] After the oil in the vacuum pressure tank 202 is degassed and dehydrated, the vacuum valve 203a is closed, the vacuum pump 203c is stopped, the air compressor 203d is started, and the air pressure valve 203b is opened to pressurize the upper space of the vacuum pressure tank 202. When the pressure reaches a certain value higher than the internal pressure of the transformer, the main oil valve 201a is opened, and the pressure generated by the air compressor 203d is used to pressurize the oil in the vacuum pressure tank 202 into the main oil tank 100 through the oil replenishment pipeline 201 and the main oil valve 201a. When the oil level in the vacuum pressure tank 202 drops to about 1 / 3, the main oil valve 201a is quickly closed, the air compressor 203d is cut off, and the air pressure valve 203b is closed. Steps (1) and (2) are repeated until the oil level of the transformer reaches the specified position.

[0040] The remaining structures are the same as those of Example 1.

[0041] Example 3, reference Figure 1 - Figure 2 , which is the third embodiment of the present invention, and this embodiment is different from the second embodiment in that: at room temperature, the evaporation pressure of water refers to the pressure required for water molecules to change from liquid to gas. At standard atmospheric pressure (101.325 kPa) and room temperature (about 20°C), the saturated vapor pressure of water is about 2.34 kPa, however, 133 Pa is much lower than this value, which means that at a pressure of 133 Pa, water molecules are more likely to change from liquid to gas.

[0042] Furthermore, when the pressure inside the system decreases, the activity space of air molecules increases, making it easier to be pumped out of the system. The vacuum degree of 133Pa is sufficient to ensure that the air is effectively pumped out, because the pressure inside the system is much lower than the atmospheric pressure at this time. At lower pressures, the boiling point of water decreases, which means that water can boil and convert into steam at lower temperatures. At a pressure of 133Pa, the boiling point of water is much lower than 100°C (at standard atmospheric pressure), so even at room temperature, water can be vaporized and pumped out. In the vacuum pressure tank 202, when the pressure drops to 133Pa or below, the water in the oil is more easily vaporized into water vapor due to the reduced pressure, and is then pumped out by the vacuum pump 203c, which ensures that the water in the oil is removed and improves the insulation performance and chemical stability of the oil.

[0043] Among them, 133Pa is selected as the stopping point of vacuuming because this pressure value can ensure that the air is extracted and the moisture in the oil is vaporized and extracted at room temperature. This is a balance point that can effectively remove moisture without causing decomposition or deterioration of oil or other substances due to excessive vacuuming.

[0044] The remaining structure is the same as that of Example 2.

[0045] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method of use steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0046] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A live oil replenishment device for a main transformer, characterized in that: include, Main fuel tank (100); The installation unit (200) comprises an oil replenishment pipeline (201), a vacuum pressure tank (202) and a connecting pipeline (203) arranged on one side of the main oil tank (100); the vacuum pressure tank (202) is respectively connected to the oil replenishment pipeline (201) and the connecting pipeline (203); and the other end of the oil replenishment pipeline (201) is connected to the main oil tank (100).

2. The main transformer live oil replenishment device according to claim 1 is characterized in that: The oil replenishment pipeline (201) comprises a main oil valve (201a) and an oil collecting valve (201b); the oil replenishment pipeline (201) is connected to a main oil tank (100) via the main oil valve (201a); and the oil replenishment pipeline (201) is connected to an oil collecting tank (201c) via the oil collecting valve (201b).

3. The main transformer live oil replenishment device according to claim 2 is characterized in that: An oil storage space is provided in the oil collecting tank (201c), and the flow rate of oil from the oil collecting tank (201c) to the vacuum pressure tank (202) is controlled by the oil collecting valve (201b).

4. The main transformer live oil replenishment device according to claim 3 is characterized in that: The vacuum pressure tank (202) comprises a pressure gauge (202a) and a bracket (202b), which are respectively arranged at the upper and lower parts of the vacuum pressure tank (202).

5. The main transformer live oil replenishing device according to claim 4 is characterized in that: The bracket (202b) is arranged at the lower part of the vacuum pressure tank (202), and the vacuum pressure tank (202) is located at a higher height than the main oil valve (201a).

6. The main transformer live oil replenishment device according to claim 5 is characterized in that: The communication pipeline (203) comprises a vacuum valve (203a) and an air pressure valve (203b); the communication pipeline (203) is connected to a vacuum pump (203c) via the vacuum valve (203a); and the communication pipeline (203) is connected to an air compressor (203d) via the air pressure valve (203b).

7. A method for using live oil replenishment for a main transformer, characterized in that: The device comprises the live oil replenishing device for the main transformer as claimed in any one of claims 1 to 6; and the using steps are as follows: In the preparation stage, all valves are closed, the valve of the vacuum pump (203c) is started, and the value of the pressure gauge (202a) is observed. When the value reaches 133 Pa, the valve of the vacuum pump (203c) is closed; During the oil filling stage, the oil collecting valve (201b) is opened, and the vacuum pressure tank (202) is filled with oil, and the pressure is maintained at or below 133 Pa; During the live oil replenishment phase, the vacuum pump (203c) is turned off, and the air compressor (203d) is started to pressurize the upper space of the vacuum pressure tank (202) and pressurize the oil in the vacuum pressure tank (202) into the main oil tank 100.

8. The method for using live oil replenishment for main transformer according to claim 7 is characterized in that: The preparation stage includes closing the main oil valve (201a), the oil collecting valve (201b), and the air pressure valve (203b), opening the vacuum valve (203a), starting the vacuum pump (203c), evacuating the vacuum pressure tank (202), the oil replenishment pipeline (201), and the connecting pipeline (203), and detecting the pressure through the pressure gauge (202a) until the vacuum degree reaches 133 Pa or less.

9. The method for using live oil replenishment for main transformer according to claim 7 is characterized in that: The oil filling stage includes, when the vacuum degree reaches 133 Pa or less, opening the oil collecting valve (201b), allowing the oil to flow from the oil collecting tank (201c) through the oil collecting valve (201b) and the oil replenishment pipeline (201) into the vacuum pressure tank (202), until the oil level reaches 3 / 4 of the vacuum pressure tank (202), closing the oil collecting valve (201b), and maintaining a pressure of 133 Pa or less, so as to accelerate the precipitation of bubbles in the oil and extract the water that may be contained in the oil.

10. The method for using live oil replenishment for main transformer according to claim 7 is characterized in that: The live oil filling stage comprises: closing the vacuum valve (203a) to stop the operation of the vacuum pump (203c), starting the air compressor (203d) and opening the air pressure valve (203b), pressurizing the upper space of the vacuum pressure tank (202), when the pressure value is maintained at a certain value higher than the internal pressure of the main oil tank (100), opening the main oil valve (201a), using the pressure generated by the air compressor (203d) to pressurize the oil in the vacuum pressure tank (202) into the main oil tank (100), when the oil level of the vacuum pressure tank (202) drops to 1 / 3, quickly closing the main oil valve (201a), cutting off the air compressor (203d) and closing the air pressure valve (203b), and repeating the steps of the preparation stage and the oil filling stage until the oil level of the transformer oil reaches a specified position.

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