Intelligent detection device for vacuum oiling of transformer

Abstract

The utility model discloses a transformer vacuum oiling intelligent detection device belongs to transformer monitoring technical field, include: box, sensor module is used for real -time acquisition pressure, temperature, oil injection flow and oil injection speed in the oiling process, actuating mechanism is used for adjusting oil injection flow and oil injection speed according to control instruction, oil filter system is used for filtering the magnetic metal particle and impurity in the oil, and is equipped with oil way switch valve to realize the automatic switching and filter function of filter oil path, detection control module is connected with sensor module and actuating mechanism communication, is used for receiving and processing the data of sensor module acquisition, and sends control instruction to actuating mechanism, man -machine interface is used for real -time display system operating parameter curve, state and alarm information. The utility model realizes the real -time accurate monitoring and intelligent control of the key parameter of oiling process, promotes oiling efficiency and quality, guarantees the safe and stable operation of transformer.

Description

Technical Field

[0001] This utility model belongs to the field of transformer monitoring technology, and in particular relates to an intelligent detection device for transformer vacuum oil injection. Background Technology

[0002] After transformer installation or maintenance, vacuum oil filling is required. Because the transformer casing is a closed structure formed by welding steel plates and lacks transparency, it is usually difficult to observe the oil level during vacuum oil filling. If too much oil is added, it may be sucked into the vacuum pump, potentially damaging it; if too little oil is added, the core will not be submerged, requiring a second vacuum filling operation. To address these issues, methods such as tapping the tank wall to sense the oil level or using infrared thermography have been employed. However, these methods lack accuracy and can still result in either too much or too little oil being added, negatively impacting the transformer vacuum oil filling process.

[0003] In existing technologies, the lack of an intelligent integrated control platform means that each detection stage is relatively independent, and data cannot be shared and analyzed in real time, resulting in lags in the control of parameters such as pressure and temperature during oil injection. The reliance on manual operation leads to low precision in controlling the oil injection speed, easily resulting in injection that is too fast or too slow, affecting the stability of the vacuum level. Especially for transformers with non-vacuumable oil conservator tanks, when the vacuum oil injection reaches approximately 200mm from the top of the tank, continuous vacuuming for 2-4 hours is required. Afterwards, high-purity nitrogen is used to release the vacuum, and oil is injected into the transformer while air is being vented from the exhaust port; this method is extremely inefficient. Furthermore, traditional oil filtration systems lack oil circuit switching valves and filtering devices to prevent small magnetic metal particles or foreign impurities that may be present in the insulating oil from entering the transformer during transmission through the oil pipes. Simultaneously, existing technologies lack effective online monitoring methods for the gas discharge status of the oil pipes and inside the transformer during the oil injection process, making it impossible to accurately determine whether the gas has been completely discharged, posing a risk of residual gas causing insulation defects. Moreover, manually recording data is not only labor-intensive, but also prone to errors and omissions, which is detrimental to subsequent quality traceability and process optimization.

[0004] The above analysis shows that there are the following defects in oil filling after transformer installation or maintenance:

[0005] 1. The information that the outlet of the vacuum oil filter needs to be in a slightly positive pressure state from the transformer oil injection valve requires manual inspection, which results in many delays.

[0006] 2. The oil supply pipeline from the vacuum oil filter to the transformer oil injection valve is not equipped with an oil circuit switching valve, and lacks a filtration device to prevent small magnetic metal particles or foreign impurities that may be contained in the insulating oil from entering the transformer during the transmission of the oil through the oil pipeline, which poses a certain risk.

[0007] 3. The transformer's oil level must be judged manually by an experienced technician through touch or other methods, which introduces a certain degree of error. Furthermore, when filling the vacuum oil conservator, the oil level indicator must be manually monitored in real time. Once the level is reached, another person must be notified to shut down the vacuum oil filter, which introduces uncertainties such as error and lack of timeliness.

[0008] 4. When evacuating the transformer, the vacuum sensor is installed on the vacuum unit body and cannot detect the true vacuum level of the transformer body. This may result in the vacuum level of the transformer body not truly meeting the vacuum level requirements of the transformer vacuum oil injection process.

[0009] 5. During the transformer vacuum oil filling process, key parameters such as pressure, temperature, flow rate, and vacuum level cannot be accurately and timely recorded and stored, requiring manual review and recording.

[0010] Therefore, there is an urgent need for a device that can monitor the vacuum oil filling of transformers. Utility Model Content

[0011] In view of the above-mentioned or existing technical deficiencies, this utility model proposes an intelligent detection device for transformer vacuum oil injection, which solves the technical problems in the existing transformer vacuum oil injection process, such as low automation, insufficient detection accuracy, cumbersome operation process, imperfect oil filtration system function, lack of gas discharge status monitoring, and easy error in data recording. It can realize real-time accurate monitoring and intelligent control of key parameters in the oil injection process, improve oil injection efficiency and quality, ensure the safe and stable operation of transformers, and optimize data management and traceability capabilities.

[0012] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0013] This utility model provides an intelligent detection device for transformer vacuum oil filling, including:

[0014] Box,

[0015] The sensor module, located inside the housing, is used to collect pressure, temperature, oil flow rate, and oil injection speed in real time during the oil injection process.

[0016] The actuator, located inside the housing, is used to adjust the oil injection flow rate and oil injection speed according to control commands;

[0017] The oil filtration system, located inside the housing, is used to filter out magnetic metal particles and impurities from the oil. It is also equipped with an oil path switching valve to achieve automatic switching of the oil filtration path and filtration function.

[0018] The detection and control module is located inside the housing and is communicatively connected to the sensor module and the actuator. It is used to receive and process the data collected by the sensor module and to issue control commands to the actuator.

[0019] The human-machine interface is located on the upper side of the enclosure. It is used to display the system's operating parameter curves, status, and alarm information in real time, and supports parameter setting, operation command input, and historical data query.

[0020] As a further technical solution of this utility model, the sensor module includes:

[0021] The pressure transmitter is installed in the outlet pipeline of the vacuum oil injection detection device to monitor the oil pressure in the oil injection pipeline in real time.

[0022] A temperature sensor is installed at the outlet of the vacuum oil filling detection device to monitor the oil filling temperature in real time.

[0023] A flow sensor is installed at the outlet of the vacuum oil injection detection device to monitor the oil injection flow rate and cumulative oil injection volume in real time.

[0024] A liquid level sensor is installed on a transparent flexible tube used to detect the oil level in the transformer body.

[0025] As a further technical solution of this utility model, the liquid level sensor is a contact liquid level sensor.

[0026] As a further technical solution of this utility model, the actuator includes:

[0027] Solenoid valves, installed on the oil filter line and oil injection line, are used to prevent backflow of vacuum pump oil in the event of power failure or misoperation.

[0028] An electric valve, installed on the oil injection line, is used to regulate the oil injection flow rate, speed, and pressure.

[0029] A vacuum valve is installed at the vacuum port of the transformer body to automatically disconnect and open the vacuum pipeline.

[0030] As a further technical solution of this utility model, the electric valve is an electric adjustable ball valve, which is used to adjust the valve opening in real time according to the flow parameters set by the control system to stabilize the oil injection flow rate; the vacuum valve is an electric vacuum ball valve.

[0031] As a further technical solution of this utility model, it also includes a manual ball valve, which is installed at the inlet and branch of the device to connect to the outlet of the vacuum oil filter and realize the hot oil circulation operation of the transformer by switching the valve after the vacuum oil injection process is completed.

[0032] As a further technical solution of this utility model, the oil filtration system includes:

[0033] A coarse filter is installed at the front end of the oil inlet of the oil filtration system to filter out large particulate impurities in the oil.

[0034] A magnetic filter is installed at the inlet end of the oil inlet pipe of the oil injection system to adsorb small magnetic metal particles in the oil.

[0035] A high-precision filter element is installed at the output end of the magnetic filter and connected to the oil inlet pipe of the oil injection system to filter out fine impurities in the oil.

[0036] The oil circuit switching valve is installed on the oil filter pipeline and is used to switch the oil filter path.

[0037] As a further technical solution of this utility model, casters are provided at the bottom of the box; handles are provided on the side of the box; an operating table is provided on the upper side of the box, and control buttons and a human-machine interface are provided on the operating table; an oil inlet and an oil outlet are provided on one side of the box.

[0038] As a further technical solution of this utility model, the detection and control module includes a programmable controller and a wireless transmission module; the programmable controller is used to run a preset algorithm, process sensor data and generate control commands; the wireless transmission module is used to communicate wirelessly with the vacuum oil filter and vacuum unit to transmit control commands and status information.

[0039] As a further technical solution of this utility model, it also includes at least one of the following sensors:

[0040] The magnetic level gauge is installed at the end of the transformer oil tank to detect the oil level in the tank and trigger a shutdown command when the preset level is reached.

[0041] A vacuum sensor, installed on the top of the transformer body, is used to monitor the vacuum level of the body and to control the vacuum oil injection flow rate through an electric valve to ensure that the vacuum value of the body meets the specifications.

[0042] Positive and negative pressure sensors are installed on the top of the transformer body to monitor the internal pressure after the transformer body is filled with oil, and to issue an alarm message when the pressure reaches the set positive pressure value.

[0043] The beneficial effects of this utility model are as follows:

[0044] 1. The detection and control module of this utility model is responsible for receiving data collected by various sensors, analyzing and processing it according to a preset algorithm, and sending control commands to the actuator. The sensor module is installed inside the device, in the oil injection pipeline, and on the transformer body to collect pressure, temperature, oil injection flow rate, and oil injection speed parameters in real time during the oil injection process. Under the control of the microprocessor, the actuator can accurately adjust the oil injection flow rate and speed. The human-machine interface adopts a touch screen to display various parameter curves, system operating status, and alarm information in real time, and also supports parameter setting, operation command input, and historical data query functions.

[0045] 2. The oil filtration system of this utility model adds a multi-stage filtration device on the basis of the original filtration function, including a magnetic filter and a high-precision filter element, which can effectively remove tiny magnetic metal particles and other impurities in the oil. It is also equipped with an oil circuit switching valve to realize the automatic switching function of the oil filtration path and ensure the long-term stability of filtration efficiency.

[0046] 3. This utility model integrates a multi-sensor real-time monitoring module, which can simultaneously collect and analyze key parameters such as vacuum degree, oil flow rate, oil temperature and oil level during the oil injection process. The detection accuracy is more than 30% higher than that of traditional manual inspection, effectively avoiding oil injection quality problems caused by parameter monitoring lag.

[0047] 4. This utility model can automatically adjust the oil injection rate and vacuum holding time according to different transformer parameters and technical requirements, simplifying the operation process to multiple core steps, reducing manual intervention by 50% compared with the prior art, and significantly reducing the operation error rate. Attached Figure Description

[0048] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 Structural diagram of the intelligent detection device for transformer vacuum oil injection provided by this utility model;

[0050] Figure 2 Main view of the intelligent detection device for transformer vacuum oil injection provided by this utility model;

[0051] Figure 3 Side view of the intelligent detection device for transformer vacuum oil injection provided by this utility model;

[0052] Figure 4 Top view of the intelligent detection device for transformer vacuum oil injection provided by this utility model;

[0053] Figure 5 The control structure diagram of the intelligent detection device for transformer vacuum oil injection provided by this utility model;

[0054] Figure 6 Circuit control structure diagram of the intelligent detection device for transformer vacuum oil injection provided by this utility model;

[0055] As shown in the figure:

[0056] 1-Box body, 2-Sensor module, 3-Actuator, 4-Oil filtration system, 5-Detection and control module, 6-Human machine interface;

[0057] 101-Castwheel, 102-Handle, 103-Control panel, 104-Control button, 105-Oil inlet, 106-Oil outlet;

[0058] 201-Pressure transmitter, 202-Temperature sensor, 203-Flow sensor, 204-Level sensor, 205-Magnetic level gauge, 206-Vacuum sensor, 207-Positive and negative pressure sensor;

[0059] 301-Solenoid valve, 302-Electric valve, 303-Vacuum valve, 304-Manual ball valve;

[0060] 401 - Coarse filter, 402 - Magnetic filter, 403 - High-precision filter element, 404 - Oil circuit switching valve;

[0061] 501 - Programmable Controller, 502 - Wireless Transmission Module. Detailed Implementation

[0062] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0063] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0064] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 this utility model.

[0065] Furthermore, the terms "first" and "second" 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 as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0067] Secondly, the term "an 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 phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments. It should be noted that the implementation methods of the present invention can be applied to any applicable scenario.

[0068] See Figures 1 to 6 The transformer vacuum oil injection intelligent detection device provided in one embodiment of the present invention includes:

[0069] Box 1,

[0070] Sensor module 2, located inside housing 1, is used to collect pressure, temperature, oil flow rate and oil speed in real time during the oil injection process;

[0071] Actuator 3, located inside housing 1, is used to adjust the oil injection flow rate and oil injection speed according to control commands;

[0072] The oil filtration system 4 is located inside the housing 1 and is used to filter out magnetic metal particles and impurities in the oil. It is also equipped with an oil circuit switching valve to realize the automatic switching of the oil filtration path and the filtration function.

[0073] The detection and control module 5 is located inside the housing 1 and is communicatively connected to the sensor module and the actuator. It is used to receive and process the data collected by the sensor module and to send control commands to the actuator.

[0074] The human-machine interface 6 is located on the upper side of the enclosure 1. It is used to display the system operating parameter curves, status and alarm information in real time, and supports parameter setting, operation command input and historical data query.

[0075] In this embodiment of the invention, the detection and control module serves as the core control unit. Employing a high-performance microprocessor, it receives data collected by various sensors, analyzes and processes it according to a preset algorithm, and simultaneously sends control commands to the actuator. Sensor modules are installed inside the device, on the oil injection pipeline, and on the transformer body to collect pressure, temperature, oil injection flow rate, and oil injection speed parameters in real time during the oil injection process. Under the control of the microprocessor, the actuator precisely adjusts the oil injection flow rate and speed. The human-machine interface uses a touchscreen display to show various parameter curves, system operating status, and alarm information in real time. It also supports parameter setting, operation command input, and historical data query functions.

[0076] See Figures 1 to 6 In this embodiment of the present invention, the sensor module 2 includes:

[0077] Pressure transmitter 201 is installed in the outlet pipeline of the vacuum oil injection detection device to monitor the oil pressure of the oil injection pipeline in real time.

[0078] Temperature sensor 202 is installed at the outlet of the vacuum oil filling detection device to monitor the oil filling temperature in real time;

[0079] The flow sensor 203 is installed at the outlet of the vacuum oil injection detection device to monitor the oil injection flow rate and cumulative oil injection volume in real time.

[0080] Liquid level sensor 204; installed on a transparent flexible tube for detecting the oil level in the transformer body.

[0081] The pressure transmitter collects the oil pressure from the oil injection pipeline and transmits the data to the detection and control module via a transmission cable. The transmission cable uses a YC8-4 type aviation plug and socket to ensure a quick and reliable connection process. The pressure transmitter can be a single-crystal silicon 0.075 class pressure transmitter, with a measurement range of -100kPa to 0kPa, 0kPa to 0.1kPa, and 0.1kPa to 200kPa, and a voltage of DC 24V. The pressure transmitter is mainly used for pressure detection to prevent pressure drops in the event of a sudden pipeline rupture. In the event of an emergency pressure drop, the vacuum oil injection detection device control system sends an emergency shutdown command to the vacuum oil purifier via a wireless transmission module, thereby achieving an emergency shutdown of the vacuum oil purifier.

[0082] The flow sensor incorporates a built-in metering chip, converting the flow signal into an electrical signal that is transmitted to the detection and control module. Based on the flow data and preset parameters, the module controls the opening of the electric valve in the actuator to dynamically adjust the oil injection flow rate, ensuring the injection speed remains stable within the set range. Simultaneously, the flow sensor features an anti-clogging design, effectively reducing the impact of impurities on metering accuracy during fluid flow. Furthermore, it supports real-time data upload to a human-machine interface, allowing operators to intuitively monitor the oil injection progress.

[0083] In this embodiment of the invention, the liquid level sensor 204 is a non-contact liquid level sensor. The liquid level sensor includes a first liquid level sensor installed inside the transformer oil tank for detecting the overall oil temperature and a second liquid level sensor installed on the transformer oil conservator located on the oil guide pipe.

[0084] The first liquid level sensor is installed approximately 150-200mm from the top of the oil tank to ensure the oil level remains within a safe range during the oil filling process. The second liquid level sensor has a liquid level display function, which can intuitively reflect the oil level status of a local oil circuit, assisting in judging the smoothness of the oil circuit and the progress of oil filling. When the oil level reaches the preset threshold of the first and second liquid level sensors, they will promptly feed back signals to the detection and control module and issue a stop oil filling signal, providing accurate liquid level reference for vacuum oil filling and avoiding situations where the oil level is too high and overflows or too low and affects the quality of oil filling. When the non-contact liquid level sensor detects that the transformer body oil level has reached the process requirement level, the vacuum oil filling detection device control system immediately sends a stop command to the vacuum oil filter and vacuum unit via the wireless transmission module, respectively, to stop the vacuum oil filter and vacuum unit.

[0085] In this embodiment of the utility model, the actuator 3 includes:

[0086] Solenoid valve 301 is installed on the oil filter line and the oil injection line to prevent backflow of vacuum pump oil in the event of power failure or misoperation.

[0087] Electric valve 302 is installed on the oil injection line and is used to regulate the oil injection flow rate, speed and pressure;

[0088] Vacuum valve 303 is installed at the vacuum port of the transformer body to realize the automatic isolation and opening of the vacuum pipeline.

[0089] Solenoid valves are used to prevent sudden power failure, shut off the vacuum pump pipe, or cause backflow of vacuum pump oil due to misoperation.

[0090] Electric valve 302 is an electrically adjustable ball valve used to adjust the valve opening in real time according to the flow parameters set by the control system to stabilize the oil injection flow rate. The electric valve controls the vacuum oil injection flow rate, injection speed, and pressure. The system automatically controls the opening and closing of the electric vacuum valve in the vacuum pipeline based on preset oil pressure and flow thresholds. When the system detects that the external pressure is below "0", the electric valve will automatically adjust. The electric valve adjusts the valve opening according to the control signal sent by the detection and control module, thereby precisely controlling the oil injection flow rate and the oil pressure before the transformer. During the oil injection process, the electric valve receives feedback data from the flow sensor and adjusts the opening in real time through a PID closed-loop control algorithm to ensure that the oil injection speed remains stable within the preset range. In addition, the electric valve has a manual emergency operation function; in the event of a sudden system failure, it can be manually adjusted via a mechanical handle to prevent interruption of oil injection or filtration operations due to electric control failure.

[0091] Vacuum valve 303 is an electric vacuum ball valve. The electric vacuum ball valve is made of stainless steel. It is installed at the vacuum port of the transformer body and is used to connect the vacuum hose to the vacuum pumping unit. It enables automatic isolation or opening of the vacuum pipeline.

[0092] This utility model also includes a manual ball valve 304. The manual ball valve is made of stainless steel and is installed at the inlet of the vacuum oil injection detection device. It is used to connect the oil delivery hose to the outlet of the vacuum oil filter. Installed inside the vacuum oil injection detection device, when the vacuum oil injection process is completed and the transformer needs to be circulated with hot oil, the vacuum oil injection detection device can be removed, and the transformer can be circulated with hot oil by switching directly through this valve.

[0093] See Figure 1 The oil filtration system 4 includes:

[0094] The coarse filter 401 is installed at the front end of the oil inlet of the oil filtration system to filter out large particulate impurities in the oil.

[0095] Magnetic filter 402 is installed at the inlet end of the oil inlet pipe of the oil injection system to adsorb small magnetic metal particles in the oil.

[0096] The high-precision filter element 403 is located at the output end of the magnetic filter and connected to the oil inlet pipe of the oil injection system to filter out fine impurities in the oil.

[0097] The oil circuit switching valve 404 is installed on the oil filter pipeline and is used to switch the oil filter path and filter.

[0098] The coarse filter is installed at the inlet of the oil filtration system. It primarily intercepts larger particles of impurities in the oil, such as silt and metal shavings. Its filter screen has a pore size of 100-200 microns, effectively protecting subsequent precision filtration components from impact and clogging by large particles, thus extending the overall service life of the oil filtration system. The coarse filter features a detachable design, allowing operators to easily clean or replace the filter screen periodically, ensuring consistent and stable filtration performance. During actual operation, when the pressure difference across the coarse filter reaches a preset value, the system will automatically issue a warning signal, reminding maintenance personnel to perform timely maintenance.

[0099] The magnetic filter is installed at the front end of the oil inlet pipe of the oil filling system. It contains a high-strength magnetic filter element that efficiently captures magnetic metal particles larger than 1 micrometer in diameter, such as iron filings and iron powder, using the principle of magnetic field adsorption. This prevents such impurities from entering the transformer with the oil, avoiding wear or insulation degradation of components such as the core and windings. The filter element is removable for easy periodic cleaning or replacement, ensuring long-term stable filtration performance. Furthermore, the top cover of the magnetic filter housing is made of partially transparent, oil-resistant material, allowing for direct observation of internal impurity accumulation and facilitating timely maintenance by operators.

[0100] The oil filtration system adds a multi-stage filtration device to the original filtration function, including a magnetic filter and a high-precision filter element, which can effectively remove tiny magnetic metal particles and other impurities from the oil. It is also equipped with an oil circuit switching valve to realize automatic switching of the oil filtration path and filtration function, ensuring long-term stability of filtration efficiency.

[0101] See Figure 1 The bottom of the housing 1 is equipped with casters 101 for easy movement and transportation; the side of the housing 1 is equipped with handles 102 for easy pushing and pulling of the housing; the upper side of the housing 1 is equipped with an operating table 103, on which control buttons 104 and human-machine interface 6 are provided for easy operation; the side of the housing 1 is equipped with an oil inlet 105 and an oil outlet 106.

[0102] In this embodiment of the present invention, the detection and control module 5 includes a programmable controller 501 and a wireless transmission module 502; the programmable controller is used to run a preset algorithm, process sensor data and generate control commands; the wireless transmission module is used to communicate wirelessly with the vacuum oil filter and vacuum unit to transmit control commands and status information.

[0103] In this embodiment of the invention, the following sensors may also be selected for configuration according to design requirements:

[0104] The magnetic level gauge 205 is installed at the end of the transformer oil conservator to detect the oil level and trigger a shutdown command when the preset level is reached. The magnetic level gauge is made of high-quality stainless steel. It is installed at the end of the transformer oil conservator (the specific height is determined by actual process requirements). When the magnetic level gauge detects that the oil level in the transformer oil conservator has reached the required process level, the vacuum oil injection detection device control system immediately sends shutdown commands to the vacuum oil filter and vacuum unit via a wireless transmission module, thereby stopping the vacuum oil filter and vacuum unit.

[0105] Vacuum sensor 206 is installed on the top of the transformer body to monitor the vacuum level of the body and control the vacuum oil injection flow rate through an electric valve to ensure that the vacuum value of the body meets the specifications. When the vacuum sensor detects that the vacuum value of the transformer body reaches the process requirements, the vacuum oil injection detection device control system immediately sends a vacuum unit shutdown command through a wireless transmission module to shut down the vacuum unit.

[0106] The positive and negative pressure sensor 207 is installed on the top of the transformer body to monitor the internal pressure after the transformer body is filled with oil, and to issue an alarm when the pressure reaches the set positive pressure value. After the transformer body is filled with oil and before the oil conservator needs to be filled with oil, in order to prevent the transformer body from being contaminated by outside air, a vacuum oil filter and a vacuum oil filling detection device are used to pressurize the transformer body (the specific value can be set) to create a slightly positive pressure environment. When the positive and negative pressure sensor detects that the pressure value meets the requirements, the vacuum oil filling detection device immediately controls the control system to issue an audible and visual alarm, and the operator opens the pipeline valve connecting the transformer body and the oil conservator to carry out the oil filling operation in the oil conservator.

[0107] In this embodiment of the invention, the detection device is powered by 24V AC instead of mains power. Operating data such as oil injection flow rate, cumulative oil injection volume, oil injection temperature, oil injection pressure, and vacuum level are displayed in real time through a human-machine interface. It also integrates alarm and emergency stop buttons to ensure safety and reliability during operation. The detection and control module rapidly analyzes and processes the collected data, promptly detecting and warning of potential operational errors or abnormalities, effectively preventing quality problems in the transformer caused by improper oil injection. Furthermore, this invention also features monitoring and fault diagnosis functions. Operators can view the equipment's operating status and various parameters in real time through the display, enabling control and fault diagnosis, greatly improving work efficiency and management level.

[0108] This invention integrates a multi-sensor real-time monitoring module, enabling simultaneous acquisition and analysis of key parameters such as vacuum level, oil flow rate, oil temperature, and oil level during the oil injection process. The detection accuracy is over 30% higher than traditional manual inspection, effectively avoiding oil injection quality problems caused by delayed parameter monitoring. The system's built-in intelligent control algorithm automatically adjusts the oil injection rate and vacuum holding time according to different transformer parameters and technical requirements, simplifying the operation process to several core steps and reducing manual intervention by 50% compared to existing technologies, significantly lowering the error rate. Addressing the issue of incomplete oil filtration system functionality, the device innovatively integrates vacuum oil injection and hot oil circulation technologies. Through a dual-channel filtration structure, it achieves efficient separation of impurities and moisture, improving filtration efficiency by 10%. Furthermore, the equipped pressure anomaly warning mechanism can predict the risk of filter blockage in advance, ensuring continuous and stable oil filtration. In addition, the system's data management system automatically generates electronic archives of the entire oil injection process, including timeline parameter curves and abnormal event records, solving the pain points of traditional paper records being easily lost and difficult to trace, providing reliable data support for the full life-cycle management of transformers. By optimizing the key process of vacuum oil injection, true full vacuum oil injection has been achieved, while effectively preventing the reduction of insulation performance caused by residual gas, thus further ensuring the safety of transformer operation.

[0109] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although several exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A transformer vacuum oil filling intelligent detection device, characterized in that, include: Box, The sensor module, located inside the housing, is used to collect pressure, temperature, oil flow rate, and oil injection speed in real time during the oil injection process. The actuator, located inside the housing, is used to adjust the oil injection flow rate and oil injection speed according to control commands; The oil filtration system, located inside the housing, is used to filter out magnetic metal particles and impurities from the oil. It is also equipped with an oil path switching valve to achieve automatic switching of the oil filtration path and filtration function. The detection and control module is located inside the housing and is communicatively connected to the sensor module and the actuator. It is used to receive and process the data collected by the sensor module and to issue control commands to the actuator. The human-machine interface is located on the upper side of the enclosure. It is used to display the system's operating parameter curves, status, and alarm information in real time, and supports parameter setting, operation command input, and historical data query.

2. The intelligent detection device for transformer vacuum oil injection according to claim 1, characterized in that, The sensor module includes: The pressure transmitter is installed in the outlet pipeline of the vacuum oil injection detection device to monitor the oil pressure in the oil injection pipeline in real time. A temperature sensor is installed at the outlet of the vacuum oil filling detection device to monitor the oil filling temperature in real time. A flow sensor is installed at the outlet of the vacuum oil injection detection device to monitor the oil injection flow rate and cumulative oil injection volume in real time. A liquid level sensor is installed on a transparent flexible tube used to detect the oil level in the transformer body.

3. The intelligent detection device for transformer vacuum oil injection according to claim 2, characterized in that, The liquid level sensor is a non-contact liquid level sensor.

4. The intelligent detection device for transformer vacuum oil injection according to claim 1, characterized in that, The implementing mechanism includes: Solenoid valves, installed on the oil filter line and oil injection line, are used to prevent backflow of vacuum pump oil in the event of power failure or misoperation. An electric valve, installed on the oil injection line, is used to regulate the oil injection flow rate, speed, and pressure. A vacuum valve is installed at the vacuum port of the transformer body to automatically disconnect and open the vacuum pipeline.

5. The intelligent detection device for transformer vacuum oil injection according to claim 4, characterized in that, The electric valve is an electrically adjustable ball valve, used to adjust the valve opening in real time according to the flow parameters set by the control system to stabilize the oil injection flow rate; the vacuum valve is an electric vacuum ball valve.

6. The intelligent detection device for transformer vacuum oil injection according to claim 1, characterized in that, It also includes a manual ball valve, which is installed at the inlet and branch of the device to connect to the outlet of the vacuum oil filter and to realize the hot oil circulation operation of the transformer by switching the valve after the vacuum oil injection process is completed.

7. The intelligent detection device for transformer vacuum oil injection according to claim 1, characterized in that, The oil filtration system includes: A coarse filter is installed at the front end of the oil inlet of the oil filtration system to filter out large particulate impurities in the oil. A magnetic filter is installed at the inlet end of the oil inlet pipe of the oil injection system to adsorb small magnetic metal particles in the oil. A high-precision filter element is installed at the output end of the magnetic filter and connected to the oil inlet pipe of the oil injection system to filter out fine impurities in the oil. The oil circuit switching valve is installed on the oil filter pipeline and is used to switch the oil filter path and filter.

8. The intelligent detection device for transformer vacuum oil injection according to claim 1, characterized in that, The bottom of the housing is equipped with casters; the side of the housing is equipped with handles; the top of the housing is equipped with an operating table, on which control buttons and a human-machine interface are provided; an oil inlet and an oil outlet are provided on one side of the housing.

9. The intelligent detection device for transformer vacuum oil injection according to claim 1, characterized in that, The detection and control module includes a programmable controller and a wireless transmission module; the programmable controller is used to run a preset algorithm, process sensor data and generate control commands; the wireless transmission module is used to communicate wirelessly with the vacuum oil filter and vacuum unit to transmit control commands and status information.

10. The intelligent detection device for transformer vacuum oil injection according to claim 2, characterized in that, It also includes at least one of the following sensors: The magnetic level gauge is installed at the end of the transformer oil tank to detect the oil level in the tank and trigger a shutdown command when the preset level is reached. A vacuum sensor, installed on the top of the transformer body, is used to monitor the vacuum level of the body and to control the vacuum oil injection flow rate via an electric valve. Positive and negative pressure sensors are installed on the top of the transformer body to monitor the internal pressure after the transformer body is filled with oil, and to issue an alarm message when the pressure reaches the set positive pressure value.

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