An oil replenishing device and an oil replenishing method

Abstract

This invention discloses an oil replenishment device and method, applicable to replenishing insulating oil to transformers. It includes: a pre-vacuum and oil-filling device, comprising an oil replenishment assembly for connecting to the transformer terminals for oil replenishment and a vacuuming assembly for pre-vacuuming the oil replenishment pipeline within the assembly; and an oil quantity dynamic measurement and monitoring device for real-time dynamic measurement and monitoring of the transformer's oil quantity data. The pre-vacuum and oil-filling device of this invention pre-treats the oil replenishment pipeline, without affecting the transformer body or any maintenance work. After connection, it can quickly and effectively replenish oil, saving more than half the construction time compared to the conventional method of directly connecting to an oil filter for oil replenishment and filtration. Furthermore, the oil quantity dynamic measurement and monitoring device measures oil quantity data based on the principle of liquid flow, enabling accurate pre-measurement of the transformer's actual oil quantity data, avoiding insufficient oil quantity during or after maintenance.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant power transmission, transformation and protection technology, and in particular to an oil replenishment device and oil replenishment method. Background Technology

[0002] Insulating oil serves as the liquid medium for insulation and cooling in transformers, acting as insulation while transferring heat generated during transformer operation to the outside. Due to the large structure of transformers, numerous pipes, valves, and covers are installed on the exterior of the casing. Under the influence of its own operating temperature and outdoor rain and heat factors, the transformer casing and connection points will shrink and deform to varying degrees, leading to oil leakage. After long-term operation, this results in insufficient insulating oil, failing to meet the requirements for normal operation.

[0003] To maintain the continuous and stable operation of transformers, the existing conventional oil replenishment method involves installing scaffolding and connecting pipelines after the transformer is shut down, then injecting oil through the oil conservator at the top of the transformer, followed by oil circulation filtration and dynamic and static venting. This method is resource-intensive, time-consuming, and has a long construction period. It also has drawbacks such as the risk of air contact with the insulating oil, which can affect the oil quality. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address at least one defect of the related technologies mentioned in the background: the existing conventional oil replenishment methods have the disadvantages of large resource investment, long time consumption, long construction period, and contact between air and insulating oil, which affects the quality of the oil. The present invention provides an oil replenishment device and oil replenishment method.

[0005] The technical solution adopted by this invention to solve its technical problem is: to construct an oil replenishment device suitable for replenishing insulating oil to transformers, comprising:

[0006] A pre-vacuum and oil filling device, comprising an oil replenishing assembly for replenishing oil to the transformer terminals and a vacuuming assembly for pre-vacuuming the oil replenishing pipeline in the oil replenishing assembly;

[0007] The oil quantity dynamic measurement and monitoring device is used to perform real-time dynamic measurement and monitoring of the oil quantity data of the transformer.

[0008] Preferably, in the oil replenishment device of the present invention, the oil replenishment component includes an oil storage unit, a first switch unit, an oil delivery unit, a second switch unit, a third switch unit, and a barrier unit connected sequentially along the oil delivery direction.

[0009] The pipeline from the first switching unit to the blocking unit is the oil replenishment pipeline.

[0010] Preferably, in the oil replenishment device of the present invention, the oil replenishment component further includes a fourth switching unit and a flow measurement unit;

[0011] The inlet end of the fourth switching unit is connected to the outlet end of the second switching unit, and the outlet end of the fourth switching unit is connected to the inlet end of the oil storage unit.

[0012] The flow measurement unit is located at the outlet end of the second switching unit.

[0013] Preferably, in the oil replenishment device of the present invention, the oil replenishment component further includes an oil filter unit disposed between the oil storage unit and the first switching unit for filtering the insulating oil.

[0014] Preferably, in the oil replenishment device of the present invention, the vacuum assembly includes a fifth switching unit, a suction unit, and a vacuum machine;

[0015] The inlet end of the fifth switching unit is connected to the oil replenishment pipeline, and the outlet end of the fifth switching unit is connected to the vacuum machine via the suction unit.

[0016] Preferably, in the oil replenishment device of the present invention, the transformer includes a housing, an oil tank disposed on the top of the housing, and a sixth switching unit connected to the bottom of the housing via a pipeline;

[0017] The oil volume dynamic measurement and monitoring device includes a seventh switch unit; the inlet end of the seventh switch unit is connected to the outlet end of the sixth switch unit, the end face of the outlet end of the seventh switch unit is flush with the bottom surface of the oil tank, and the transparent pipeline at the outlet end of the seventh switch unit extends upward for reading the liquid level in the oil tank.

[0018] The present invention also provides a method for replenishing oil using the oil replenishing device described in any of the above claims, applicable to replenishing insulating oil to transformers, comprising:

[0019] S10: Before the transformer is shut down for maintenance, the oil supply pipeline in the oil supply assembly is evacuated by the vacuuming assembly. After the vacuuming is completed, the oil supply pipeline is filled with insulating oil by the oil supply assembly.

[0020] S20: After the transformer is shut down, connect the oil quantity dynamic measurement and monitoring device to the transformer;

[0021] S30: Under the condition that insulating oil dynamically overflows from the oil replenishment pipeline and the outlet pipeline of the oil replenishment switch unit of the transformer, the oil replenishment pipeline and the outlet pipeline of the oil replenishment switch unit are terminated and no oil overflows.

[0022] S40: The transformer is replenished with oil through the oil replenishment component, and the oil quantity data of the transformer is dynamically measured and monitored in real time through the oil quantity dynamic measurement and monitoring device. When the oil quantity in the transformer is replenished to the preset range, the oil replenishment switch unit is turned off, and the pre-vacuum and oil filling device and the oil quantity dynamic measurement and monitoring device are turned off and removed.

[0023] Preferably, in the oil replenishment method of the oil replenishment device of the present invention, when the oil replenishment assembly includes an oil storage unit, a first switching unit, an oil conveying unit, a second switching unit, a third switching unit, and a blocking unit connected sequentially along the oil conveying direction, step S10 includes:

[0024] In the initial state, the first switch unit, the second switch unit, and the third switch unit are in the closed state, and the oil storage unit stores insulating oil.

[0025] Turn on the second switch unit and the third switch unit, start the vacuum assembly, and evacuate the oil replenishment line to below the preset vacuum level;

[0026] The vacuum assembly is shut down, the first switch unit is slowly opened, and the oil delivery unit is started to fill the oil supply line with oil.

[0027] Preferably, in the oil replenishment method of the oil replenishment device of the present invention, when the oil replenishment component further includes a fourth switching unit and a flow measurement unit, step S10 further includes:

[0028] Initially, the fourth switch unit is in the off state;

[0029] After the oil supply line is filled with oil until the flow measurement unit has a reading, the fourth switch unit is slowly opened to slowly and fully fill the oil supply line with oil.

[0030] Preferably, in the oil replenishment method of the oil replenishment device of the present invention, when the oil replenishment component further includes an oil filter unit disposed between the oil storage unit and the first switching unit, step S10 further includes:

[0031] Before vacuuming, the first switch unit, the second switch unit, and the fourth switch unit are turned on, and the oil filtration unit and the oil delivery unit are started to filter the insulating oil.

[0032] After filtration is completed, the first and fourth switch units are turned off, the third switch unit is slowly turned on, and the vacuum assembly is started.

[0033] Step S10 also includes:

[0034] After filling the oil supply line with oil until the flow measurement unit has a reading, and then slowly opening the fourth switch unit, the oil supply line is also circulated and dynamically filtered.

[0035] Furthermore, the process after step S30 and before step S40 includes:

[0036] Turn off the fourth switch unit to stop the dynamic oil filtration of the oil replenishment pipeline.

[0037] By implementing this invention, the following beneficial effects are achieved:

[0038] The pre-vacuum and oil filling method of the pre-vacuum and oil filling device pre-treats the oil replenishment pipeline. Before the oil replenishment switch unit of the transformer body is opened, it will not affect the transformer body and all maintenance work. After connection, it can quickly and effectively replenish the oil volume, saving more than half of the construction time compared with the conventional method of directly connecting the oil filter for oil replenishment and oil filtration.

[0039] The oil quantity dynamic measurement and monitoring device measures oil quantity data based on the principle of liquid flow, which can accurately measure the real oil quantity of transformers in advance and avoid insufficient oil quantity during or after maintenance.

[0040] The pre-vacuum and oil filling device and the oil quantity dynamic measurement and monitoring device are two separate sets of equipment. After connection, the oil quantity measurement and replenishment can be realized quickly and effectively. At the same time, it eliminates the problem of the insulating oil directly contacting the air during the conventional oil replenishment process, which affects the quality of the oil. Attached Figure Description

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0042] Figure 1 This is a schematic diagram of the pre-vacuum and oil filling device of the present invention;

[0043] Figure 2 This is a schematic diagram of the oil quantity dynamic measurement and monitoring device of the present invention;

[0044] Figure 3 This is a schematic diagram of the pre-vacuum and oil filling device and the oil quantity dynamic measurement and monitoring device of the present invention connected to the transformer.

[0045] Figure 4 This is a flowchart of the oil replenishment method of the oil replenishment device of the present invention. Detailed Implementation

[0046] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0048] In the description of the invention, it should be understood that the terms "top," "bottom," "inner," "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of the invention, unless otherwise stated, "a plurality of" means two or more.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected," "located in," and "located in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a chemical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0051] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0052] One embodiment of the present invention discloses an oil replenishment device suitable for replenishing insulating oil to a transformer 3, comprising:

[0053] like Figure 1 The pre-vacuum and oil filling device shown includes an oil filling component 1 for connecting to the 3rd terminal of the transformer for oil filling and a vacuuming component 2 for pre-vacuuming the oil filling pipeline in the oil filling component 1.

[0054] like Figure 2The oil quantity dynamic measurement and monitoring device shown is used to perform real-time dynamic measurement and monitoring of the oil quantity data of transformer 3.

[0055] Specifically, such as Figure 1 As shown, the oil replenishment assembly 1 includes an oil storage unit 11, a first switching unit 12, an oil delivery unit 13, a second switching unit 14, a third switching unit 15, and a barrier unit 16 connected sequentially along the oil delivery direction. The pipeline from the first switching unit 12 to the barrier unit 16 is the oil replenishment pipeline. For example, the oil storage unit 11 is an oil storage tank, the first switching unit 12 is a first isolation valve, the oil delivery unit 13 is an oil pump, the second switching unit 14 is a second isolation valve, the third switching unit 15 is a third isolation valve, and the barrier unit 16 is a baffle.

[0056] To ensure the oil replenishment line is slowly and fully filled with insulating oil, the oil replenishment assembly 1 also includes a fourth switching unit 17 and a flow measurement unit 18. The inlet of the fourth switching unit 17 is connected to the outlet of the second switching unit 14, preferably between the second switching unit 14 and the third switching unit 15, and the outlet of the fourth switching unit 17 is connected to the inlet of the oil storage unit 11. The flow measurement unit 18 is located at the outlet of the second switching unit 14, preferably between the second switching unit 14 and the third switching unit 15. For example, the fourth switching unit 17 is a fourth isolation valve, and the flow measurement unit 18 is a flow meter.

[0057] The oil replenishment assembly 1 also includes an oil filter unit 19 disposed between the oil storage unit 11 and the first switching unit 12 for filtering the insulating oil. For example, the oil filter unit 19 is an oil filter machine, and it is provided with a buffer tank 191 for oil-gas separation.

[0058] like Figure 1 As shown, the vacuum assembly 2 includes a fifth switching unit 21, a suction unit 22, and a vacuum pump 23. The inlet end of the fifth switching unit 21 is connected to the oil supply line, preferably between the second switching unit 14 and the third switching unit 15, and the outlet end of the fifth switching unit 21 is connected to the vacuum pump 23 via the suction unit 22. For example, the fifth switching unit 21 is a fifth switching valve, and the suction unit 22 is an auxiliary vacuum pump.

[0059] In this embodiment, as Figure 2 As shown, transformer 3 includes a housing 31 for storing insulating oil, an oil conservator 33 located at the top of housing 31 for managing oil levels, and a sixth switching unit 34 connected to the bottom of housing 31 via pipelines. Additionally, transformer 3 includes a gas relay 32 located between housing 31 and oil conservator 33, and its own oil replenishment switching unit 35. For example, the oil replenishment switching unit 35 may be an isolation valve.

[0060] The oil level dynamic measurement and monitoring device includes a seventh switch unit 4. The inlet of the seventh switch unit 4 is connected to the outlet of the sixth switch unit 34. The outlet face of the seventh switch unit 4 is flush with the bottom surface of the oil tank 33. A transparent pipeline at the outlet of the seventh switch unit 4 extends upwards to read the liquid level in the oil tank 33. Based on the principle of liquid communication, the oil level dynamic measurement and monitoring device measures and monitors the oil level data within the housing 31 in real time, compares it with the standard oil level requirements at different oil temperatures, and confirms whether oil replenishment is needed and the amount of replenishment, thus achieving dynamic measurement of the liquid level in the oil tank 33. For example, the sixth switch unit 34 is a sixth switch valve, and the seventh switch unit 4 is a seventh switch valve.

[0061] It should be noted that the oil storage unit 11, the first switch unit 12, the oil delivery unit 13, the second switch unit 14, the third switch unit 15, the barrier unit 16, the fourth switch unit 17, the flow measurement unit 18, the oil filter unit 19, the fifth switch unit 21, the suction unit 22, the vacuum machine 23, the sixth switch unit 34, the seventh switch unit 4, and the oil replenishment switch unit 35 are all connected by pipelines.

[0062] like Figure 4 As shown, one embodiment of the present invention also discloses an oil replenishment method for the oil replenishment device described in the above embodiments, applicable to replenishing insulating oil to transformer 3, comprising:

[0063] S10: Before the transformer 3 is shut down for maintenance, the oil supply pipeline in the oil supply assembly 1 is evacuated by the vacuum pumping assembly 2. After the vacuum is completed, the oil supply pipeline is filled with insulating oil by the oil supply assembly 1.

[0064] Specifically, step S10 includes:

[0065] In the initial state, the first switch unit 12, the second switch unit 14 and the third switch unit 15 are in the closed state, and the oil storage unit 11 stores insulating oil.

[0066] Open the second switch unit 14 and the third switch unit 15, start the vacuum assembly 2, and evacuate the oil replenishment line to below the preset vacuum level;

[0067] Close the vacuum assembly 2, slowly open the first switch unit 12, and start the oil supply unit 13 to fill the oil supply pipeline with oil.

[0068] In some embodiments, step S10 includes:

[0069] In the initial state, the first switch unit 12, the second switch unit 14, the third switch unit 15 and the fourth switch unit 17 are in the closed state, and the oil storage unit 11 stores insulating oil.

[0070] Open the second switch unit 14 and the third switch unit 15, start the vacuum assembly 2, and evacuate the oil replenishment line to below the preset vacuum level;

[0071] Close the vacuum assembly 2, slowly open the first switch unit 12, and start the oil supply unit 13 to fill the oil supply pipeline with oil.

[0072] After the oil supply line is filled with oil until a reading is obtained in the flow measurement unit 18, the fourth switch unit 17 is slowly opened to slowly and fully fill the oil supply line with oil.

[0073] In some embodiments, step S10 further includes:

[0074] In the initial state, the first switch unit 12, the second switch unit 14, the third switch unit 15 and the fourth switch unit 17 are in the closed state, and the oil storage unit 11 stores insulating oil.

[0075] Open the first switch unit 12, the second switch unit 14 and the fourth switch unit 17, and start the oil filter unit 19 and the oil delivery unit 13 to filter the insulating oil;

[0076] After filtration is completed, turn off the first switch unit 12 and the fourth switch unit 17, slowly turn on the third switch unit 15, start the vacuum pumping assembly 2, and evacuate the oil replenishment line to below the preset vacuum level.

[0077] Close the vacuum assembly 2, slowly open the first switch unit 12, and start the oil supply unit 13 to fill the oil supply pipeline with oil.

[0078] After the oil supply line is filled with oil until a reading is obtained in the flow measurement unit 18, the fourth switch unit 17 is slowly opened to perform dynamic oil filtration and slow and sufficient oil filling of the oil supply line.

[0079] Furthermore, the process after step S30 and before step S40 includes: closing the fourth switch unit 17 to stop the dynamic oil filtration of the oil replenishment pipeline.

[0080] Completely, step S10 includes:

[0081] In the initial state, the first switch unit 12, the second switch unit 14, the third switch unit 15, the fourth switch unit 17 and the fifth switch unit 21 are in the closed state, and the oil storage unit 11 stores insulating oil.

[0082] Open the first switch unit 12, the second switch unit 14 and the fourth switch unit 17, start the oil filter unit 19 and the oil delivery unit 13 to perform offline treatment of the insulating oil, that is, filter the insulating oil until it is qualified.

[0083] After filtration is completed, the first switch unit 12 and the fourth switch unit 17 are closed, the third switch unit 15 and the fifth switch unit 21 are slowly opened, and the vacuum machine 23 and the suction unit 22 are started to vacuum the oil replenishment line. The vacuum is evacuated to below 20 mbar. After the data stabilizes, the vacuum machine 23 and the suction unit 22 are stopped. The vacuum pretreatment process of the oil replenishment line is completed.

[0084] During the vacuum pretreatment process of the oil replenishment pipeline, the oil filtration unit 19 is started to pump the insulating oil in the oil storage unit 11 into the buffer tank for processing. Oil sample analysis is performed at the oil filtration unit 19 to confirm that the oil data is qualified.

[0085] Close the fifth switch unit 21, slowly open the first switch unit 12, start the oil supply unit 13 to fill the oil supply pipeline with oil, and after the flow measurement unit 18 has a reading, slowly open the fourth switch unit 17 to perform circulating dynamic oil filtration and slow and sufficient oil filling of the oil supply pipeline until the oil supply pipeline is filled with qualified insulating oil.

[0086] The pre-vacuum and oil filling device is equipped with the process conditions for immediate oil replenishment.

[0087] The integrated design of the pre-vacuum and oil-filling device in this invention allows for the initiation of pipeline vacuuming or oil-filling processes at any time according to process requirements. Compared to the previous serial approach of connecting to the transformer 3 circuit and then gradually starting the vacuuming and oil circulation of the oil filter, this method allows for pre-vacuuming and oil-filling of the pipeline circuit before the transformer 3 is shut down, significantly shortening the maintenance period. The auxiliary vacuum pump also enables secondary vacuuming of the circuit containing the oil filter, and the small-circulation dynamic oil filtration circuit further enhances the quality of the pipeline oil.

[0088] By using this part of the device and process technology, before the oil replenishment switch unit 35 of the transformer body is opened, it will not affect the transformer body and all maintenance work. After connection, oil quantity measurement and replenishment can be realized quickly and effectively, saving more than half of the construction period compared with the conventional method of replenishing and filtering oil by directly connecting the oil filter.

[0089] S20: After transformer 3 is shut down, connect the oil quantity dynamic measurement and monitoring device to transformer 3, such as... Figure 3 As shown.

[0090] Specifically, step S20 includes:

[0091] After confirming that transformer 3 has been shut down, remove the blocking unit on the outlet pipeline of the sixth switch unit 34 of transformer 3 and connect the seventh switch unit 4.

[0092] Open the seventh switch unit 4 and read the liquid level in the oil tank 33 through the transparent pipeline at the outlet end of the seventh switch unit 4;

[0093] Based on the oil quantity requirements and oil temperature during operation, determine whether the oil quantity meets the requirements. If the oil quantity is insufficient, connect the pre-vacuum and oil filling device to replenish the oil quantity.

[0094] This invention relates to a dynamic oil level measurement and monitoring device based on the principle of liquid flow. It measures oil level data in real-time and accurately, pre-measuring the most accurate oil level and replenishing it promptly to avoid passively accepting insufficient oil levels. This component can also be used independently. When the oil level gauge fails or its indication deviates during transformer 3's operation, this device provides direct and accurate oil level data, offering crucial support for transformer 3's operation.

[0095] S30: Under the condition that insulating oil dynamically overflows from the oil replenishment pipeline and the outlet pipeline of the oil replenishment switch unit 35 of transformer 3, the oil replenishment pipeline and the outlet pipeline of the oil replenishment switch unit 35 are terminated and no oil overflows, such as... Figure 3 As shown.

[0096] Specifically, step S30 includes:

[0097] Move the pipeline at the outlet end of the third switch unit 15 to the vicinity of the pipeline at the outlet end of the oil replenishment switch unit 35 of the transformer 3, and place the two on the same horizontal plane with a distance of no more than a preset value, such as 20cm.

[0098] An oil collection tank 5 is placed below the pipeline at the outlet end of the third switch unit 15 to collect the insulating oil that overflows when the pipeline is terminated.

[0099] After closing the third switch unit 15 within the preset range, remove the blocking unit 16, causing insulating oil to overflow from the outlet pipeline of the third switch unit 15.

[0100] After removing the blocking unit of the outlet pipeline of the oil replenishing switch unit 35, open the oil replenishing switch unit 35 within the preset range, so that insulating oil overflows from the outlet pipeline of the oil replenishing switch.

[0101] Under the condition of dynamic overflow of insulating oil, the flanges on both sides of the third switch unit 15 and the oil replenishment switch unit 35 are terminated using a diagonal screw connection method. During the termination, it is ensured that insulating oil continuously overflows from the outlet pipelines of the two switch units, ensuring that the pressure in the entire pipeline is always higher than the ambient pressure. The medium in the pipeline is in a state of continuous dynamic output to the outside, which fundamentally eliminates the problem of gas residue caused by dead corners in pipeline valves and other parts under static conditions, which can only be eliminated by increasing oil circulation and dynamic and static venting. At the same time, it also ensures the continuous stability of the oil in the oil replenishment pipeline. Then, the connecting screws are gradually tightened until there is no oil overflow.

[0102] S40: The oil replenishment component 1 replenishes the transformer 3, and the oil quantity data of the transformer 3 is dynamically measured and monitored in real time by the oil quantity dynamic measurement and monitoring device. When the oil quantity in the transformer 3 is replenished to the preset range, the oil replenishment switch unit 35 is turned off, and the pre-vacuum and oil filling device and the oil quantity dynamic measurement and monitoring device are turned off and removed.

[0103] Specifically, step S40 includes:

[0104] Open the oil replenishment switch unit 35 of the fully opened transformer 3, slowly open the third switch unit 15 on the oil replenishment pipeline, and check that the value of the flow measurement unit 18 is within the appropriate range before replenishing oil.

[0105] The oil level data is checked through the transparent pipeline at the outlet of the seventh switch unit 4. After the oil level in the oil tank 33 is read to a suitable height, the oil filter unit 19 and the oil delivery unit 13 are shut down. When the oil replenishment data is calculated and verified to be within a suitable range, the third switch unit 15 and the oil replenishment switch unit 35 are turned off.

[0106] After the liquid level in transformer 3 is stable and the oil replenishment data is within a suitable range, remove the pre-vacuum and oil filling device and the oil quantity dynamic measurement and monitoring device.

[0107] Check that there is no gas accumulation in the viewing window of gas relay 32; otherwise, vent the gas using the knob on top.

[0108] Oil samples were taken from the body side of transformer 3 for data analysis, such as gas content, to confirm that the oil data was qualified.

[0109] The site was cleaned up, and the oil replenishment work was completed.

[0110] By implementing this invention, the following beneficial effects are achieved:

[0111] The pre-vacuum and oil filling method of the pre-vacuum and oil filling device pre-treats the oil replenishment pipeline. Before the oil replenishment switch unit of the transformer body is opened, it will not affect the transformer body and all maintenance work. After connection, it can quickly and effectively replenish the oil volume, saving more than half of the construction time compared with the conventional method of directly connecting the oil filter for oil replenishment and oil filtration.

[0112] The oil quantity dynamic measurement and monitoring device measures oil quantity data based on the principle of liquid flow, which can accurately measure the real oil quantity of transformers in advance and avoid insufficient oil quantity during or after maintenance.

[0113] The pre-vacuum and oil filling device and the oil quantity dynamic measurement and monitoring device are two separate sets of equipment. After connection, the oil quantity measurement and replenishment can be realized quickly and effectively. At the same time, it eliminates the problem of the insulating oil directly contacting the air during the conventional oil replenishment process, which affects the quality of the oil.

[0114] It is understood that the above embodiments only illustrate some implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that for those skilled in the art, without departing from the concept of the present invention, the above embodiments or technical features can be freely combined, and several modifications and improvements can be made. These all fall within the protection scope of the present invention. That is, the embodiments described "in some embodiments" can be freely combined with any of the embodiments above and below. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. An oil replenishing device, suitable for replenishing insulating oil to a transformer (3), characterized in that, include: The pre-vacuum and oil filling device includes an oil replenishing component (1) for replenishing oil to the transformer (3) and a vacuuming component (2) for pre-vacuuming the oil replenishing pipeline in the oil replenishing component (1). Oil quantity dynamic measurement and monitoring device, used to perform real-time dynamic measurement and monitoring of oil quantity data of the transformer (3); The oil replenishment assembly (1) includes an oil storage unit (11), a first switch unit (12), an oil delivery unit (13), a second switch unit (14), a third switch unit (15), and a barrier unit (16) connected sequentially along the oil delivery direction; the pipeline from the first switch unit (12) to the barrier unit (16) is the oil replenishment pipeline; The oil replenishment assembly (1) also includes a fourth switching unit (17) and a flow measurement unit (18). The inlet end of the fourth switch unit (17) is connected to the outlet end of the second switch unit (14), and the outlet end of the fourth switch unit (17) is connected to the inlet end of the oil storage unit (11); the flow measurement unit (18) is located at the outlet end of the second switch unit (14).

2. The oil replenishment device according to claim 1, characterized in that, The oil replenishment assembly (1) also includes an oil filter unit (19) disposed between the oil storage unit (11) and the first switch unit (12) for filtering the insulating oil.

3. The oil replenishment device according to claim 1, characterized in that, The vacuum assembly (2) includes a fifth switching unit (21), a suction unit (22), and a vacuum machine (23). The inlet end of the fifth switch unit (21) is connected to the oil replenishment pipeline, and the outlet end of the fifth switch unit (21) is connected to the vacuum machine (23) via the suction unit (22).

4. The oil replenishment device according to claim 1, characterized in that, The transformer (3) includes a housing (31), an oil tank (33) located on the top of the housing (31), and a sixth switch unit (34) connected to the bottom of the housing (31) via pipelines. The oil quantity dynamic measurement and monitoring device includes a seventh switch unit (4), the inlet end of the seventh switch unit (4) is connected to the outlet end of the sixth switch unit (34), the end face of the outlet end of the seventh switch unit (4) is flush with the bottom surface of the oil tank (33), and the transparent pipeline at the outlet end of the seventh switch unit (4) extends upward to read the liquid level in the oil tank (33).

5. A method for replenishing oil using the oil replenishing device according to any one of claims 1-4, applicable to replenishing insulating oil to a transformer (3), characterized in that, include: S10: Before the transformer (3) is shut down for maintenance, the oil replenishment pipeline in the oil replenishment assembly (1) is evacuated in advance by the vacuum assembly (2), and after the vacuum is completed, the oil replenishment pipeline is filled with insulating oil by the oil replenishment assembly (1). S20: After the transformer (3) is shut down, connect the oil quantity dynamic measurement and monitoring device to the transformer (3). S30: Under the condition that insulating oil dynamically overflows from the oil replenishment pipeline and the oil replenishment switch unit (35) outlet pipeline of the transformer (3), the oil replenishment pipeline and the oil replenishment switch unit (35) outlet pipeline are terminated and no oil overflows. S40: The transformer (3) is replenished with oil through the oil replenishment component (1), and the oil quantity data of the transformer (3) is dynamically measured and monitored in real time through the oil quantity dynamic measurement and monitoring device. When the oil quantity in the transformer (3) is replenished to the preset range, the oil replenishment switch unit (35) is turned off, and the pre-vacuum and oil filling device and the oil quantity dynamic measurement and monitoring device are turned off and removed.

6. The oil replenishment method of the oil replenishment device according to claim 5, characterized in that, When the oil replenishment assembly (1) includes an oil storage unit (11), a first switching unit (12), an oil delivery unit (13), a second switching unit (14), a third switching unit (15), and a blocking unit (16) connected sequentially along the oil delivery direction, step S10 includes: In the initial state, the first switch unit (12), the second switch unit (14) and the third switch unit (15) are in the closed state, and the oil storage unit (11) stores insulating oil; Turn on the second switch unit (14) and the third switch unit (15), start the vacuum assembly (2), and evacuate the oil replenishment line to below the preset vacuum level; Turn off the vacuum assembly (2), slowly turn on the first switch unit (12), and start the oil delivery unit (13) to fill the oil supply line with oil.

7. The oil replenishment method of the oil replenishment device according to claim 6, characterized in that, When the oil replenishment assembly (1) further includes a fourth switching unit (17) and a flow measurement unit (18), step S10 further includes: Initially, the fourth switch unit (17) is in the closed state; After the oil supply line is filled with oil until the flow measurement unit (18) has a reading, the fourth switch unit (17) is slowly opened to slowly and fully fill the oil supply line with oil.

8. The oil replenishment method of the oil replenishment device according to claim 7, characterized in that, When the oil replenishment assembly (1) further includes an oil filter unit (19) disposed between the oil storage unit (11) and the first switching unit (12), step S10 further includes: Before vacuuming, the first switch unit (12), the second switch unit (14) and the fourth switch unit (17) are turned on, and the oil filter unit (19) and the oil delivery unit (13) are started to filter the insulating oil. After filtration is completed, the first switch unit (12) and the fourth switch unit (17) are turned off, the third switch unit (15) is slowly turned on, and the vacuum assembly (2) is started. Step S10 also includes: After filling the oil supply line with oil until the flow measurement unit (18) has a reading, the fourth switch unit (17) is slowly opened, and the oil supply line is also subjected to dynamic oil filtration. Furthermore, the process after step S30 and before step S40 includes: The fourth switch unit (17) is turned off to stop the dynamic oil filtration of the oil replenishment pipeline.

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