Multifunctional oil taking and supplementing device for low-oil equipment and operation method

Abstract

This invention provides a multi-functional oil extraction and replenishment device and operating method for low-oil equipment, integrating oil extraction and replenishment functions into one unit. Utilizing components such as solenoid valves, oil pumps, and vacuum pumps, it achieves automated control, enabling uninterrupted oil extraction and replenishment of insulating oil in PT / CT oil chambers, avoiding inconvenience and losses caused by power outages. The multi-functional oil extraction and replenishment device for low-oil equipment includes a housing comprising a top plate, a front panel, a rear panel, side panels, and a bottom plate. The front panel is equipped with a touch screen display, an oil storage port, an oil return port, an oil replenishment port, and an air vent. The rear panel is equipped with a switch and a power socket. A vacuum tank is housed within the housing, and the vacuum tank is fixed to the bottom plate by bolts on all four sides. The housing also includes a circuit board, a switching power supply, an oil pump, a vacuum pump, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve, a seventh solenoid valve, a first pressure sensor, and a second pressure sensor.

Description

Technical Field

[0001] This invention relates to the field of oil-limited equipment maintenance technology, specifically to a multi-functional oil replenishment device for oil-limited equipment. Background Technology

[0002] Oil-immersed instrument transformers are one of the important high-voltage devices in power systems, and they are widely used in relay protection, system monitoring, power system analysis, and other fields.

[0003] Currently, most PT / CT transformers used in power systems employ insulating oil as the insulating medium. The quality and quantity of the oil in the oil chamber directly affect the operational safety of the PT / CT transformer and the safety of power equipment. The main factors affecting the insulation level of the oil in the PT / CT transformer oil chamber are moisture, air bubbles, and particles in the oil. Suspended air bubbles and trace water content in the oil affect the breakdown voltage, especially when the trace water content increases, it will accelerate the decrease in the breakdown voltage. The main reasons for the increase of moisture, air bubbles, and particles in the oil in the transformer oil chamber are periodic oil sampling and testing of the transformer, poor transformer sealing, and oil leakage.

[0004] A significant drop in oil level can reduce the insulation strength of the exposed coil portion, potentially leading to serious consequences such as explosion, breakdown, fire, and damage to nearby equipment, resulting in a power grid safety accident.

[0005] To ensure the safe and reliable operation of voltage and current transformers and the power system, it is essential to promptly understand and monitor the condition of the transformers during operation, especially whether the insulation level of the oil in the transformer's oil chamber meets the requirements. This necessitates periodic oil sampling and maintenance, which can lead to low oil levels in PT / CT transformers, requiring oil level adjustment through replenishment. Furthermore, due to the significant temperature differences between summer and winter, some insulating oil needs to be drained from the oil chamber during the summer, while transformer oil needs to be replenished during the winter cooling season.

[0006] Traditional methods for replenishing insulating oil in the PT / CT oil chamber include using a manual piston-type pump, nitrogen injection, or lifting the top expander of the PT / CT for top-mounted injection.

[0007] (1) Manual oil replenishment is performed directly from the expansion tank at the top of the transformer (top injection method). This method of oil replenishment is not only prone to mixing with tiny suspended air bubbles in the oil, which can lead to air adsorption inside the PT / CT or false oil level due to residual air, but also requires power outage when maintaining, replenishing and pumping the insulating oil in the oil chamber of the voltage and current transformer. The operator needs to climb to the top of the transformer, which is labor-intensive and unsafe.

[0008] (2) When adding oil using a pressure pump, air will be introduced into the current transformer. Air bubbles may enter or leave the coil and remain there, which can easily cause insulation problems.

[0009] Moreover, the power grid is becoming increasingly important to people's production and daily life. For a long time, power grid operators have been preventing power grid accidents, especially large-scale power outages and power grid collapses. As a result, power outages have become difficult, especially during major and important periods such as peak summer seasons and large-scale international events where power outages are not possible. In order to ensure the safe operation of instrument transformers, it is necessary to perform uninterrupted vacuum oil replenishment work on the instrument transformers.

[0010] To ensure the safe operation of PT / CT, guarantee power supply quality, reduce the number of power outages, extend maintenance cycles, and ensure service life, it is essential to perform uninterrupted oil sampling and replenishment of insulating oil in the PT / CT oil chamber. Summary of the Invention

[0011] This invention aims to address the technical deficiencies of existing technologies by providing a multifunctional oil extraction and replenishment device and operating method for low-oil equipment. It integrates oil extraction and replenishment functions into one unit and utilizes components such as solenoid valves, oil pumps, and vacuum pumps to achieve automated control. This allows for uninterrupted oil extraction and replenishment of insulating oil in PT / CT oil chambers, avoiding the inconvenience and losses caused by power outages.

[0012] This invention provides the following technical solution: a multi-functional oil replenishment device for low-oil equipment, comprising a housing, the housing including a top plate, a front panel, a rear panel, side panels, and a bottom plate. The front panel is equipped with a touch screen display, an oil storage port, an oil return port, an oil replenishment port, and an vent port. The rear panel is equipped with a switch and a power socket. A vacuum tank is housed inside the housing, and the vacuum tank is fixed to the bottom plate by bolts on all four sides. The housing also includes a circuit board, a switching power supply, an oil pump, a vacuum pump, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, and a fifth solenoid valve. The system includes a valve, a sixth solenoid valve, a seventh solenoid valve, a first pressure sensor, and a second pressure sensor. The oil reservoir is connected to a fourth solenoid valve, and the oil return port is connected to a second solenoid valve. The fourth solenoid valve is connected in parallel to the oil return pipe of the second solenoid valve via an oil reservoir pipe. The vacuum tank is connected to an oil pump and a vacuum pump. The output end of the oil pump is connected to a filter via a seventh solenoid valve. The two ends of the filter are connected to two ports of a four-way connector via an oil supply pipe and a sixth solenoid valve, respectively. The other two ports of the four-way connector are connected to the oil supply port and the first pressure sensor, respectively.

[0013] Preferably, the vacuum tank is equipped with a heating rod, a first float switch, a second float switch, and a third float switch, and the heating rod, the first float switch, the second float switch, and the third float switch are connected to the circuit board.

[0014] Preferably, it also includes a vacuum connector, which is connected to the vacuum tank. The vacuum connector includes five interfaces, which are respectively connected to the parallel oil storage port and oil return port, oil pump, second pressure sensor, first solenoid valve, and vacuum pump. One end of the vacuum pump is connected to the vacuum connector through a third solenoid valve, and the other end of the vacuum pump is connected to a fifth solenoid valve. The fifth solenoid valve is fixed to the upper side of the vacuum tank by an exhaust fixing plate.

[0015] Preferably, the vacuum tank is provided with a vacuum tank cover on the top, and a filter is fixed on one side of the vacuum tank cover by a filter fixing plate. A flange chuck is provided on the outer periphery of the filter, and a temperature transmitter is fixed on the other side of the vacuum tank cover by a temperature fixing plate.

[0016] Preferably, it also includes an oil replenishment fixture, which includes a transparent tank with four interfaces: an equipment interface, an oil replenishment interface, an oil return interface, and an oil intake interface. Each interface is connected to the transparent tank with an equipment-side ball valve, an oil replenishment port ball valve, an oil return port ball valve, and an oil intake port ball valve.

[0017] Preferably, it also includes a fixing plate and a circuit board fixing plate. The fixing plate is fixedly disposed on the inner side of the front panel. A fourth solenoid valve, a second solenoid valve, and a four-way connector are fixedly disposed on the upper side of the fixing plate. A circuit board and a first solenoid valve, a third solenoid valve, a fifth solenoid valve, and a sixth solenoid valve are fixedly disposed on the circuit board fixing plate.

[0018] Preferably, the vacuum pump and the oil pump are respectively mounted on the base plate.

[0019] Preferably, the rear panel is also provided with a grounding post.

[0020] Preferably, the side plate is provided with a plurality of heat dissipation holes, and the top plate is provided with opposite handles.

[0021] The operating procedure for the multi-functional oil replenishment device in low-oil equipment is as follows:

[0022] (1) Preparation before oil replenishment: Before the oil replenishment operation, close all ball valves on the oil replenishment tool, connect the equipment interface of the oil replenishment tool to the oil inlet of the equipment, connect the oil replenishment interface of the oil replenishment tool to the oil inlet with the oil replenishment pipeline, connect the return oil interface of the oil replenishment tool to the return oil inlet with the return oil pipeline, connect the oil inlet of the oil replenishment tool to the oil sample bottle, and finally connect the oil storage port to the oil drum with the oil storage pipeline.

[0023] (2) Oil sampling operation: Turn on the switch, touch the display screen to enter the corresponding function to draw vacuum, and at the same time open the return oil port and oil replenishment port ball valve of the oil sampling and replenishment tool. When the vacuum value reaches the set value, close the oil replenishment port ball valve and return oil port ball valve of the oil sampling and replenishment tool. Then, intermittently open and close the ball valve on the side of the oil sampling and replenishment tool to take oil samples into the oil sampling and replenishment tool. Connect the return oil pipe to the vent, open the return oil port and oil sampling port ball valve on the oil sampling and replenishment tool, and wait for the oil sample to flow into the sampling bottle. Sampling is completed.

[0024] (3) Oil replenishment operation: Turn on the switch, touch the display screen to enter the corresponding function of vacuuming, and at the same time open the return oil port and oil replenishment port ball valve of the oil replenishment tool. When the vacuum value reaches the set value, the vacuuming ends. Then perform the oil storage operation to store the oil in the oil drum into the vacuum tank. Perform the circulation operation to filter out gas, moisture, impurities, etc. in the pipeline. After the first circulation, the oil level in the vacuum tank will drop. Store oil again and circulate again. Next, open the side ball valve of the oil replenishment tool to start the oil replenishment operation. When the oil replenishment pressure is greater than the set value, the oil replenishment ends. Connect the oil replenishment pipeline to the vent and the oil storage pipeline to the oil replenishment port. Perform the circulation operation to vent and drain the oil, and completely return the oil in the equipment and pipeline to the oil drum. After turning off the machine, remove the pipeline and the oil replenishment tool.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] This invention discloses a multi-functional oil sampling and replenishment device for low-oil equipment. It is specifically designed for sampling and replenishing insulating oil in low-oil equipment such as PT (voltage transformer) and CT (current transformer) in power systems. It is an efficient, safe and reliable device that can perform uninterrupted vacuum oil replenishment and sampling for low-oil equipment.

[0027] I. Efficient and convenient oil replenishment operation

[0028] 1. Integrated design: The device integrates oil extraction and replenishment functions into one unit, simplifying the operation process. Through the touch screen, users can easily control the entire oil extraction and replenishment process, improving work efficiency.

[0029] 2. Automated control: Automated control is achieved by using components such as solenoid valves, oil pumps and vacuum pumps. During the oil extraction process, the vacuum pump is responsible for creating a pressure difference to make the insulating oil in the equipment flow out. During the oil replenishment process, the oil pump injects new oil into the oil chamber through the filter, ensuring the accuracy and stability of the operation.

[0030] II. Precise control of oil quantity

[0031] 1. Pressure sensor monitoring: The first and second pressure sensors are used to monitor pressure changes during the oil replenishment process, thereby accurately controlling the oil quantity. This avoids equipment failure or safety hazards caused by too much or too little oil.

[0032] 2. Precise control of solenoid valves: By precisely controlling the on / off state of each solenoid valve, precise regulation of oil flow can be achieved. For example, during oil sampling, the solenoid valve connected to the return port can be closed to ensure that the oil sample does not flow back; during oil replenishment, the solenoid valve connected to the replenishment port can be opened to allow new oil to enter the oil chamber.

[0033] 3. Filter filtration: The filter is used to filter impurities and particulate matter in the new oil, ensuring that the oil added to the oil chamber is pure. This not only extends the service life of the equipment, but also improves the operational stability of the equipment.

[0034] III. Improve security and reliability

[0035] 1. Operation without power interruption: This device allows for the replenishment of insulating oil in the PT / CT oil chamber without power interruption, avoiding the inconvenience and losses caused by power outages;

[0036] 2. Touchscreen display and switching power supply: The touchscreen display provides an intuitive operating interface, allowing users to easily view and set various parameters; the switching power supply ensures the stable operation and safety of the device.

[0037] In summary, the multi-functional oil replenishment device for low-oil equipment provides strong support for the maintenance and management of low-oil equipment such as PT / CT through its efficient and convenient oil replenishment operation, precise oil quantity control, and improved safety and reliability. Attached Figure Description

[0038] Figure 1 This is a three-dimensional structural diagram of a specific embodiment of the present invention;

[0039] Figure 2 for Figure 1 A schematic diagram of the internal structure of the specific implementation embodiment shown;

[0040] Figure 3 for Figure 1 The diagram shows a partial structural schematic of the specific implementation method.

[0041] Figure 4 This is a schematic diagram of the vacuum tank.

[0042] Figure 5 A schematic diagram of the oil replenishment fixture;

[0043] Figure 6 This is the oil circuit diagram of the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Chamber; 2. Vacuum chamber; 3. Heating rod; 4. First pressure sensor; 5. Second pressure sensor

[0046] 6. Vacuum pump; 7. Oil pump; 8. Filter; 9. First float switch; 10. Second float switch; 11. Third float switch; 12. Circuit board; 13. Switching power supply; 14. First solenoid valve; 15. Third solenoid valve; 16. Sixth solenoid valve; 17. Seventh solenoid valve; 18. Fourth solenoid valve; 19. Second solenoid valve; 20. Fifth solenoid valve; 21. Handle; 22. Four-way connector; 23. Mounting plate; 24. Exhaust mounting plate; 25. Filter mounting plate; 26. Temperature mounting plate; 27. Temperature transmitter; 28. Circuit board mounting plate; 29. ​​Vacuum connection; 30. Oil replenishment tooling;

[0047] 1-1. Front panel; 1-2. Rear panel; 1-3. Side panel;

[0048] 1-1-1 Touchscreen display; 1-1-2 Oil reservoir; 1-1-3 Oil return port; 1-1-4 Oil filler port; 1-1-5

[0049] Drainage outlet;

[0050] 30-1, Oil return port; 30-2, Oil return port ball valve; 30-3, Oil replenishment port; 30-4, Oil replenishment port ball valve; 30-5, Oil intake port; 30-6, Oil intake port ball valve; 30-7, Equipment interface; 30-8, Equipment side ball valve; 30-9, Transparent tank. Detailed Implementation

[0051] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0052] like Figures 1-6 As shown, it illustrates a specific embodiment of the present invention: as Figures 1-6As shown, the multi-functional oil replenishment device for low-oil equipment disclosed in this invention includes a housing 1. The housing 1 includes a top plate, a front panel 1-1, a rear panel 1-2, a side panel 1-3, and a bottom plate. The front panel 1-1 is equipped with a touch screen display 1-1-1, an oil storage port 1-1-2, an oil return port 1-1-3, an oil replenishment port 1-1-4, and an vent port 1-1-5. The rear panel 1-2 is equipped with a switch and a power socket. A vacuum tank 2 is installed inside the housing 1. The vacuum tank 2 is fixed to the bottom plate by fixing bolts on all four sides. The housing 1 also includes a circuit board 12, a switching power supply 13, an oil pump 7, a vacuum pump 6, a first solenoid valve 14, a second solenoid valve 19, a third solenoid valve 15, and a fourth solenoid valve 18. The system includes a fifth solenoid valve 20, a sixth solenoid valve 16, a seventh solenoid valve 17, a first pressure sensor 4, and a second pressure sensor 5. The oil storage port 1-1-2 is connected to the fourth solenoid valve 18, and the oil return port 1-1-3 is connected to the second solenoid valve 19. The fourth solenoid valve 18 is connected in parallel to the oil return pipe of the second solenoid valve 19 through the oil storage pipe and the oil return pipe of the second solenoid valve 19. The vacuum tank 2 is connected to the oil pump 7 and the vacuum pump 6. The output end of the oil pump 7 is connected to the filter 8 through the seventh solenoid valve 17. The two ends of the filter 8 are connected to two ports of the four-way connector 22 through the oil replenishment pipe and the sixth solenoid valve 16, respectively. The other two ports of the four-way connector 22 are connected to the oil replenishment port 1-1-4 and the first pressure sensor 4, respectively.

[0053] Preferred, such as Figure 4 As shown, the vacuum tank 2 is equipped with a heating rod 3, a first float switch 9, a second float switch 10, and a third float switch 11, which are connected to the circuit board 12.

[0054] In the aforementioned multi-functional oil replenishment device for low-oil equipment, the vacuum tank 2 is a crucial component. It not only stores and processes oil but also integrates various additional functions to enhance the device's performance and efficiency. Specifically, the vacuum tank 2 houses a heating rod 3, a first float switch 9, a second float switch 10, and a third float switch 11. These components are connected to the circuit board 12, collectively enabling precise control and management of the oil.

[0055] Heating rod 3 is installed inside vacuum tank 2. Its function is to heat the oil to prevent it from solidifying or increasing in viscosity at low temperatures, which would affect its fluidity and the normal operation of the equipment. Heating rod 3 receives power and control signals through circuit board 12 and can automatically adjust the heating power according to the preset temperature range to keep the oil within a suitable operating temperature range. The heating temperature range is settable from 0 to 60 degrees Celsius.

[0056] A float switch is activated by the change in buoyancy of a float in a liquid. In vacuum tank 2, three float switches (first float switch 9, second float switch 10, and third float switch 11) are installed, each located at a different liquid level (low, medium, and high), to monitor and control the oil level.

[0057] First float switch 9: Usually set near the lowest liquid level. When the oil level drops to this position, the first float switch 9 will trigger a signal, which will be transmitted to the control system through the circuit board 12 to indicate that oil needs to be added in order to avoid damage to the equipment due to lack of oil.

[0058] Second float switch 10: Set within the normal operating liquid level range, used to monitor the normal liquid level of the oil. When the liquid level reaches or exceeds this position, the second float switch 10 will send a signal to the control system, indicating that the oil is in normal operating condition.

[0059] The third float switch 11 is typically located near the highest liquid level as a safety protection mechanism. When the oil level rises abnormally, reaching or exceeding this level, the third float switch 11 will immediately trigger an alarm and transmit the alarm to the control system via the circuit board 12 to prevent oil spillage from causing environmental pollution or equipment damage.

[0060] Circuit board 12 serves as the control center of the entire device, responsible for receiving signals from various sensors (including heating rod 3 and float switches 9, 10, and 11) and processing them according to preset logic and algorithms. It can automatically adjust the heating power of the heating rod, control the start and stop of the oil pump, and issue alarm signals based on parameters such as oil level and temperature, to ensure that the oil in vacuum tank 2 is always in optimal working condition.

[0061] In summary, the coordinated operation of the heating rod 3 and float switches (9, 10, 11) installed in the vacuum tank 2 with the circuit board 12 enables precise control and management of the oil, improving the stability and reliability of the multi-functional oil replenishment device for low-oil equipment.

[0062] Preferred, such as Figure 3 As shown, it also includes a vacuum connector 29, which is connected to the vacuum tank 2. The vacuum connector 29 includes 5 ports, which are respectively connected to the oil storage port 1-1-2 and the oil return port 1-1-3, the oil pump 7, the second pressure sensor 5, the first solenoid valve 14, and the vacuum pump 6. One end of the vacuum pump 6 is connected to the vacuum connector 29 through the third solenoid valve 15, and the other end of the vacuum pump 6 is connected to the fifth solenoid valve 20. The fifth solenoid valve 20 is fixed to the upper side of the vacuum tank 2 by the exhaust fixing plate 24.

[0063] Vacuum connector 29 is responsible for connecting and coordinating multiple key components to achieve functions such as vacuum extraction, oil treatment, and pressure monitoring.

[0064] The vacuum connector 29 is designed with five interfaces, which are used to connect to the oil reservoir 1-1-2, the oil return port 1-1-3, the oil pump 7, the second pressure sensor 5, the first solenoid valve 14, and the vacuum pump 6, respectively. Through these interfaces, the vacuum connector 29 can effectively manage and control the flow of oil and adjust the vacuum level.

[0065] Parallel connection of oil storage port 1-1-2 and oil return port 1-1-3:

[0066] These two interfaces are typically connected in parallel to the vacuum connector 29 via pipes, allowing oil to flow in from the oil reservoir or out from the oil return port as needed. This design enables oil to flexibly enter and exit the vacuum tank 2 during vacuum processing.

[0067] Connection of oil pump 7:

[0068] Oil pump 7 is connected via an interface of vacuum connector 29 for drawing or injecting oil as needed. Oil pump 7 is typically used in conjunction with filter 8 to ensure the cleanliness of the oil.

[0069] Connection of the second pressure sensor 5:

[0070] The second pressure sensor 5 is connected to the inside of the vacuum tank 2 via a vacuum connector 29 to monitor pressure changes inside the vacuum tank in real time. This is crucial for controlling the vacuum level and ensuring the safe operation of the equipment. Vacuum level: 100,000–100 Pa (absolute pressure).

[0071] Connection of the first solenoid valve 14:

[0072] The first solenoid valve 14, acting as a control element, is connected to the relevant pipeline via a vacuum connector 29. It is responsible for controlling the flow path of oil or gas, ensuring that specific channels are opened or closed at the correct time.

[0073] Connection of vacuum pump 6:

[0074] One end of the vacuum pump 6 is connected to the vacuum connector 29 via the third solenoid valve 15, and the other end is connected to the exhaust mounting plate 24 via the fifth solenoid valve 20. The vacuum pump 6 is responsible for generating a vacuum to extract gas molecules from the vacuum tank 2 and reduce its internal pressure.

[0075] Fifth solenoid valve 20: This solenoid valve is located at the exhaust end of the vacuum pump 6 and is fixed to the upper side of the vacuum tank 2 by the exhaust fixing plate 24. When the vacuum pump 6 is working, the fifth solenoid valve 20 opens, allowing gas molecules to be extracted from the vacuum tank 2 and discharged into the external environment. When the vacuum pump 6 stops working, the fifth solenoid valve 20 closes to prevent external gas from re-entering the vacuum tank 2. Therefore, the fifth solenoid valve 20, as an exhaust valve, needs to be located on the upper side of the cylinder.

[0076] Preferred, such as Figures 2-3 As shown, the vacuum tank 2 is provided with a vacuum tank cover on the top. A filter 8 is fixed on one side of the vacuum tank cover by a filter fixing plate 25. A flange chuck is provided on the outer periphery of the filter 8. A temperature transmitter 27 is fixed on the other side of the vacuum tank cover by a temperature fixing plate 26.

[0077] The vacuum tank cover is the top sealing part of the vacuum tank 2. It is usually designed to be removable to facilitate cleaning and maintenance of the interior of the vacuum tank. The vacuum tank cover is equipped with multiple mounting plates and interfaces for installing key components such as the filter 8 and the temperature transmitter 27.

[0078] The filter fixing plate 25 is a fixing device set on one side of the vacuum tank cover, used to install and fix the filter 8 to ensure the stability and reliability of the filter 8.

[0079] The filter mounting plate 25 is provided with mounting holes that match the filter 8, allowing the filter 8 to be fixed in place. A flange chuck is provided on the outer periphery of the filter 8 for further securing the filter. The filter 8 is a key oil handling component, responsible for filtering the oil before it enters the vacuum tank to remove impurities and particulate matter. This helps maintain the cleanliness of the inside of the vacuum tank and prevents oil contamination from negatively impacting equipment performance.

[0080] The temperature mounting plate 26 is a fixing device located on the other side of the vacuum tank cover. It is used to install and fix the temperature transmitter 27, allowing the temperature transmitter 27 to be easily fixed on the vacuum tank cover and enabling real-time monitoring of the internal temperature of the vacuum tank. This ensures accurate monitoring and timely feedback of the internal temperature of the vacuum tank. It is responsible for converting the temperature signal inside the vacuum tank into a standard electrical signal and outputting it to the circuit board for controlling the heating rod.

[0081] The design of the vacuum tank's top cover and related fixing components enables the vacuum tank to efficiently perform functions such as oil filtration and temperature monitoring. By precisely controlling the installation and fixing of the filter 8 and temperature transmitter 27, the vacuum tank can ensure the cleanliness of the oil and the accuracy of the temperature, thereby improving the overall performance and reliability of the equipment.

[0082] Preferred, such as Figure 5As shown, it also includes an oil replenishment tool 30, which includes a transparent tank 30-9. The transparent tank 30-9 is provided with four interfaces, including an equipment interface 30-7, an oil replenishment interface 30-3, an oil return interface 30-1, and an oil intake interface 30-5. At the connection between the transparent tank 30-9 and each interface, an equipment-side ball valve 30-8, an oil replenishment ball valve 30-4, an oil return ball valve 30-2, and an oil intake ball valve 30-6 are respectively provided.

[0083] In the oil replenishment tool 30, the transparent tank 30-9 is a core component. It is designed with four interfaces and corresponding ball valves to achieve flexible connection and control with equipment, oil replenishment source, oil return system and oil extraction equipment.

[0084] By integrating a transparent tank 30-9 and multiple interfaces and ball valves, this fixture can intuitively display the state of the oil and precisely control its flow.

[0085] The transparent tank 30-9 has four ports, each equipped with a corresponding ball valve for precise control of oil flow: Equipment port 30-7 is used to connect to equipment to be maintained or refueled. Opening the equipment-side ball valve 30-8 allows oil to flow between the transparent tank 30-9 and the equipment.

[0086] The oil replenishment fixture 30 integrates a transparent tank 30-9 and multiple interfaces and ball valves to connect the device with low-oil equipment and complete oil replenishment operations. At the same time, the introduction of the transparent tank 30-9 makes the observation and monitoring of the oil status more intuitive and convenient, which helps to discover and deal with potential problems in a timely manner.

[0087] Preferred, such as Figures 2-3 As shown, it also includes a fixing plate 23 and a circuit board fixing plate 28. The fixing plate 23 is fixedly installed on the inner side of the front panel 1-1. The fourth solenoid valve 18, the second solenoid valve 19 and the four-way connector 22 are fixedly installed on the upper side of the fixing plate 23. The circuit board fixing plate 28 is fixedly installed with the circuit board 12 and the first solenoid valve 14, the third solenoid valve 15, the fifth solenoid valve 20 and the sixth solenoid valve 16.

[0088] The fixing plate 23 and the circuit board fixing plate 28 are responsible for fixing the solenoid valve, the four-way connector, the circuit board and others, respectively, thereby ensuring the stable operation and reliable connection of the entire device.

[0089] The mounting plate 23 is a robust flat plate structure that is typically fixed to the inside of the front panel 1-1. The main function of the mounting plate 23 is to provide a stable support platform for installing and fixing the solenoid valve, the four-way connector, and connecting it to the corresponding oil reservoir and return port. The four-way connector connects to the oil replenishment port.

[0090] Fourth solenoid valve 18 and second solenoid valve 19: These two solenoid valves are fixed on the upper side of the mounting plate 23. They are usually used to control the flow path of the oil. By precisely controlling the opening and closing state of the solenoid valves, the oil can be switched between different pipelines.

[0091] The four-way connector 22 is also fixed on the upper side of the fixing plate 23. It is a pipe connector with four connection ports, which connect the first pressure sensor, the oil replenishment port, and both ends of the filter.

[0092] The circuit board mounting plate 28 is used to fix the circuit board 12 and electronic components such as the first solenoid valve 14, the third solenoid valve 15, the fifth solenoid valve 20 and the sixth solenoid valve 16.

[0093] This design ensures more robust and precise connections between components, thereby guaranteeing stable operation and reliable performance of the device. At the same time, this modular design facilitates maintenance, reducing maintenance costs and time.

[0094] Preferred, such as Figures 2-3 As shown, the vacuum pump 6 and the oil pump 7 are respectively mounted on the base plate.

[0095] Vacuum pump 6 and oil pump 7 are respectively mounted on the base plate. This design is usually intended to achieve compactness, stability and ease of maintenance of the equipment.

[0096] The vacuum pump 6 is securely mounted on the base plate, usually connected to the base plate by bolts or other fixing devices to ensure its stability and reliability during operation.

[0097] The main function of vacuum pump 6 is to remove gas from inside a vacuum tank or other equipment to achieve the required vacuum level. It is connected to the exhaust port of the vacuum tank via a connecting pipe. When vacuum pump 6 is working, it extracts the gas inside the vacuum tank and discharges it into the atmosphere through the exhaust port.

[0098] The oil pump 7 is also securely mounted on the base plate, typically connected to it via bolts or other fasteners. It is connected to components such as the oil tank and filter via connecting pipes. When the oil pump 7 is operating, it draws oil from the tank, filters it, and supplies it to the equipment. Mounting it on the base plate facilitates these operations and helps protect the oil pump from external environmental interference and damage.

[0099] Mounting the vacuum pump 6 and oil pump 7 separately on the base plate achieves a compact, stable, and easy-to-maintain device. This design helps optimize the overall structure of the equipment, improving its performance and reliability. Simultaneously, it facilitates maintenance and upkeep, reducing maintenance costs and time.

[0100] Preferably, the rear panel 1-2 is also provided with a grounding post.

[0101] The grounding post installed on the rear panel 1-2 is a critical electrical safety component. The main function of the grounding post is to connect the metal casing or other conductive parts of electrical equipment to the ground, forming a good grounding loop. This connection ensures that the electrical equipment is in a relatively stable potential state, thereby preventing electric shock accidents caused by leakage or other reasons. In addition, the grounding post can effectively eliminate static charge between the electrical equipment and the ground, preventing the hazards of electrostatic interference and lightning current.

[0102] Preferred, such as Figures 1-2 As shown, several heat dissipation holes are provided on the side plates 1-3, and opposite handles 21 are provided on the top plate.

[0103] The primary function of the ventilation holes is to promote airflow so that the heat generated inside the equipment can be effectively dissipated. When the equipment is running, its internal components generate heat. If heat is not dissipated in time, it may cause the equipment to overheat, thus affecting its performance and lifespan. Through the ventilation holes on the side panel, cool external air can enter the equipment and exchange with the hot internal air, thereby reducing the equipment temperature.

[0104] The inclusion of heat dissipation vents can significantly improve the heat dissipation efficiency of the equipment, reduce its temperature, and thus enhance its stability and reliability. Simultaneously, it can extend the equipment's lifespan and reduce malfunctions and maintenance costs caused by overheating.

[0105] The handle 21 significantly improves the portability and ease of use of the device, making it easier for users to move and transport it. This not only increases user productivity but also reduces the risk of device damage due to difficulties in handling.

[0106] In summary, the numerous heat dissipation holes on the side panels 1-3 and the relative handles 21 on the top panel not only improve the heat dissipation efficiency and portability of the equipment, but also ensure its stability and reliability.

[0107] The operating procedure for the multi-functional oil replenishment device in low-oil equipment is as follows:

[0108] (1) Preparation before oil replenishment: Before the oil replenishment operation, close all ball valves on the oil replenishment fixture 30, connect the equipment interface 30-7 of the oil replenishment fixture 30 to the equipment oil inlet, connect the oil replenishment interface 30-3 of the oil replenishment fixture 30 to the oil replenishment port 1-1-4 with the oil replenishment pipeline, connect the return oil interface 30-1 of the oil replenishment fixture 30 to the return oil port 1-1-3 with the return oil pipeline, connect the oil inlet 30-5 of the oil replenishment fixture 30 to the oil sample bottle, and finally connect the oil storage port 1-1-2 to the oil drum with the oil storage pipeline.

[0109] (2) Oil sampling operation: Turn on the switch, touch the display screen 1-1-1 to enter the corresponding function of vacuuming, and at the same time open the return oil port 30-1 and the oil replenishment port ball valve 30-4 of the oil sampling and replenishment tool 30. When the vacuum value reaches the set value, close the oil replenishment port ball valve 30-4 and the return oil port ball valve 30-2 of the oil sampling and replenishment tool 30. Then, intermittently open and close the equipment side ball valve 30-8 of the oil sampling and replenishment tool 30 to take oil samples into the oil sampling and replenishment tool 30. Connect the return oil pipe to the drain port 1-1-5, open the return oil port 30-1 and the oil sampling port ball valve 30-6 on the oil sampling and replenishment tool 30, wait for the oil sample to flow into the sampling bottle, and the sampling is completed.

[0110] (3) Oil replenishment operation: Turn on the switch, touch the display screen 1-1-1 to enter the corresponding function of vacuuming, and at the same time open the return oil port 30-1 and the oil replenishment port ball valve 30-4 of the oil replenishment tool 30. When the vacuum value reaches the set value, the vacuuming ends. Then, perform the oil storage operation to store the oil in the oil drum into the vacuum tank 2. Perform the circulation operation to filter out gas, moisture, impurities, etc. in the pipeline. After the first circulation, the oil level in the vacuum tank 2 will drop. Store oil again and circulate again. Next, open the equipment side ball valve 30-8 of the oil replenishment tool 30 to start the oil replenishment operation. When the oil replenishment pressure is greater than the set value, the oil replenishment ends. Connect the oil replenishment pipeline to the vent port 1-1-5 and the oil storage pipeline to the oil replenishment port 1-1-4. Perform the circulation operation to vent and drain the oil, and completely return the oil in the equipment and pipeline to the oil drum. After turning off the machine, remove the pipeline and the oil replenishment tool 30.

[0111] This solution allows for setting the oil replenishment speed based on factors such as the PT / CT transformer type, ambient temperature, oil sampling port structure, and transformer height (the speed range is adjustable from 1.0 to 2.5 L / min).

[0112] It has an overpressure protection function. When the oil pressure exceeds the preset pressure value, the system will automatically stop working, realizing intelligent protection for the current transformer and the equipment itself, and preventing accidents.

[0113] It features automatic vacuuming and automatic maintenance of system vacuum, meeting the requirements for online, bubble-free oil replenishment of PT / CT current transformers under energized vacuum.

[0114] It is equipped with a transparent dedicated transition joint, which facilitates on-site oil replenishment and observation of current transformers, and is equipped with various models of oil sampling joints to meet the on-site oil replenishment requirements of most current transformers.

[0115] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. These changes involve related technologies well known to those skilled in the art, and all of them fall within the protection scope of the present invention.

[0116] Many other changes and modifications can be made without departing from the concept and scope of this invention. It should be understood that this invention is not limited to the specific embodiments, and the scope of this invention is defined by the appended claims.

Claims

1. A multi-functional oil replenishment device for low-oil equipment, characterized in that, The enclosure includes a housing (1), which comprises a top plate, a front panel (1-1), a rear panel (1-2), a side panel (1-3), and a bottom plate. The front panel (1-1) is equipped with a touch screen display (1-1-1), an oil reservoir (1-1-2), an oil return port (1-1-3), an oil replenishment port (1-1-4), and an vent (1-1-5). The rear panel (1-2) is equipped with a switch and a power socket. A vacuum tank (2) is installed inside the housing (1). The vacuum tank (2) is fixed to the bottom plate by bolts on all four sides. The housing (1) also contains a circuit board (12), a switching power supply (13), an oil pump (7), a vacuum pump (6), a first solenoid valve (14), a second solenoid valve (19), a third solenoid valve (15), a fourth solenoid valve (18), and a fifth solenoid valve (20). The sixth solenoid valve (16), the seventh solenoid valve (17), the first pressure sensor (4), and the second pressure sensor (5) are connected. The oil storage port (1-1-2) is connected to the fourth solenoid valve (18), and the oil return port (1-1-3) is connected to the second solenoid valve (19). The fourth solenoid valve (18) is connected to the vacuum tank (2) in parallel with the oil return pipe of the second solenoid valve (19) through the oil storage pipe. The vacuum tank (2) is connected to the oil pump (7) and the vacuum pump (6) respectively. The output end of the oil pump (7) is connected to the filter (8) through the seventh solenoid valve (17). The two ends of the filter (8) are connected to two of the ports of the four-way connector (22) through the oil replenishment pipe and the sixth solenoid valve (16) respectively. The other two ports of the four-way connector (22) are connected to the oil replenishment port (1-1-4) and the first pressure sensor (4) respectively.

2. The multi-functional oil replenishment device for low-oil equipment according to claim 1, characterized in that, The vacuum tank (2) is equipped with a heating rod (3), a first float switch (9), a second float switch (10), and a third float switch (11), which are connected to the circuit board (12).

3. The multi-functional oil replenishment device for low-oil equipment according to claim 2, characterized in that, It also includes a vacuum connector (29), which is connected to the vacuum tank (2). The vacuum connector (29) includes 5 ports, which are respectively connected to the parallel oil storage port (1-1-2) and oil return port (1-1-3), oil pump (7), second pressure sensor (5), first solenoid valve (14), and vacuum pump (6). One end of the vacuum pump (6) is connected to the vacuum connector (29) through the third solenoid valve (15), and the other end of the vacuum pump (6) is connected to the fifth solenoid valve (20). The fifth solenoid valve (20) is fixed on the upper side of the vacuum tank (2) through the exhaust fixing plate (24).

4. The multi-functional oil replenishment device for low-oil equipment according to claim 3, characterized in that, The vacuum tank (2) is provided with a vacuum tank cover on the top. A filter (8) is fixed on one side of the vacuum tank cover by a filter fixing plate (25). A flange chuck is provided on the outer periphery of the filter (8). A temperature transmitter (27) is fixed on the other side of the vacuum tank cover by a temperature fixing plate (26).

5. The multi-functional oil replenishment device for low-oil equipment according to any one of claims 1-4, characterized in that, It also includes an oil replenishment tool (30), which includes a transparent tank (30-9). The transparent tank (30-9) is provided with four interfaces, including an equipment interface (30-7), an oil replenishment interface (30-3), an oil return interface (30-1), and an oil intake interface (30-5). At the connection between the transparent tank (30-9) and each interface, an equipment side ball valve (30-8), an oil replenishment port ball valve (30-4), an oil return port ball valve (30-2), and an oil intake port ball valve (30-6) are respectively provided.

6. The multi-functional oil replenishment device for low-oil equipment according to claim 5, characterized in that, It also includes a fixing plate (23) and a circuit board fixing plate (28). The fixing plate (23) is fixedly installed on the inner side of the front panel (1-1). The fourth solenoid valve (18), the second solenoid valve (19) and the four-way connector (22) are fixedly installed on the upper side of the fixing plate (23). The circuit board fixing plate (28) is fixedly installed with a circuit board (12) and a first solenoid valve (14), a third solenoid valve (15), a fifth solenoid valve (20) and a sixth solenoid valve (16).

7. The multi-functional oil replenishment device for low-oil equipment according to claim 6, characterized in that, The vacuum pump (6) and oil pump (7) are respectively mounted on the base plate.

8. The multi-functional oil replenishment device for low-oil equipment according to claim 7, characterized in that, The rear panel (1-2) is also equipped with a grounding post.

9. The multi-functional oil replenishment device for low-oil equipment according to claim 8, characterized in that, Several heat dissipation holes are provided on the side plate (1-3), and a handle (21) is provided on the top plate.

10. The operating method of a multi-functional oil replenishment device for low-oil equipment, characterized in that, Using the multi-functional oil replenishment device for low-oil equipment as described in any one of claims 5-9, the following steps are performed: (1) Preparation before oil replenishment: Before the oil replenishment operation, close all ball valves on the oil replenishment fixture (30), connect the equipment interface (30-7) of the oil replenishment fixture (30) to the oil inlet of the equipment, connect the oil replenishment interface (30-3) of the oil replenishment fixture (30) to the oil replenishment port (1-1-4) with the oil replenishment pipeline, connect the return oil interface (30-1) of the oil replenishment fixture (30) to the return oil port (1-1-3) with the return oil pipeline, connect the oil inlet (30-5) of the oil replenishment fixture (30) to the oil sample bottle, and finally connect the oil storage port (1-1-2) to the oil drum with the oil storage pipeline. (2) Oil sampling operation: Turn on the switch, touch the display screen (1-1-1) to enter the corresponding function of vacuuming, and at the same time open the return oil interface (30-1) and the oil replenishment ball valve (30-4) of the oil sampling and replenishment tool (30). When the vacuum value reaches the set value, close the oil replenishment ball valve (30-4) and the return oil ball valve (30-2) of the oil sampling and replenishment tool (30). Then, intermittently open and close the equipment-side ball valve (30-8) of the oil sampling and replenishment tool (30) to take oil samples into the oil sampling and replenishment tool (30). Connect the return oil pipe to the vent (1-1-5), open the return oil interface (30-1) and the oil sampling ball valve (30-6) on the oil sampling and replenishment tool (30), and wait for the oil sample to flow to the sampling bottle. The sampling is completed. (3) Oil replenishment operation: Turn on the switch, touch the display screen (1-1-1) to enter the corresponding function of vacuuming, and at the same time open the return oil interface (30-1) and the oil replenishment port ball valve (30-4) of the oil replenishment tool (30). When the vacuum value reaches the set value, the vacuuming ends. Then, perform the oil storage operation, store the oil in the oil drum into the vacuum tank (2), perform the circulation operation, filter out the gas, moisture, impurities, etc. in the pipeline. After the first circulation, the oil level in the vacuum tank (2) will drop. Store oil again and circulate again. Next, open the equipment side ball valve (30-8) of the oil replenishment tool (30) to start the oil replenishment operation. When the oil replenishment pressure is greater than the set value, the oil replenishment ends. Connect the oil replenishment pipeline to the vent (1-1-5) and the oil storage pipeline to the oil replenishment port (1-1-4). Perform the circulation operation to vent and release oil, and completely return the oil in the equipment and pipeline to the oil drum. After turning off the machine, remove the pipeline and the oil replenishment tool (30).

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