Transformer insulating oil leakage oil-discharge-free maintenance method and device

Abstract

The invention discloses a transformer insulating oil leakage oil-discharge-free maintenance method and device, and relates to the technical field of insulating oil leakage maintenance, and the method comprises the steps: adjusting the internal oil pressure of a transformer to keep balance with the external atmospheric pressure; performing vacuum drying and exhausting on the interior of the transformer; carrying out vacuum leakage rate detection on the transformer in an oil-carrying state; and predicting the maintenance environment of the transformer according to the weather prediction system. Internal and external pressure balance adjustment of the insulating oil leakage position of the transformer is achieved, it is ensured that air is prevented from being sucked in the overhauling process, the overhauling quality is improved, the operation stability and safety of the transformer are improved, and the fault occurrence probability is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of insulation oil leakage inspection and repair of oil-immersed transformers, in particular to an insulation oil leakage inspection and repair method and device for transformers without oil drainage. Background Art

[0002] In the power system, the transformer is an indispensable component, and its normal operation is of vital importance to the stability of the power system. However, during the long-term operation of the transformer, due to various reasons such as seal aging and vibration, oil leakage may occur. This will not only waste precious transformer insulating oil resources, but also threaten the normal operation of the transformer and even cause damage to the transformer. Therefore, how to effectively solve the problem of transformer oil leakage has always been a research hotspot in the power field.

[0003] At present, the solutions to the oil leakage problem of transformers mainly include regular inspections, material plugging and maintenance, etc. However, these methods are not only labor-intensive, but also difficult to fundamentally solve the oil leakage problem. In addition, there are some technical solutions that attempt to solve the oil leakage problem by changing the oil leakage level structure of the transformer or adding plugging sealing materials, but these solutions often have problems such as complex structure, high cost, and difficult maintenance. The traditional oil drainage and maintenance method not only involves cumbersome process flow, but also takes more than ten days to deal with the oil leakage of ultra-high voltage transformers. Long-term power outages have had a significant adverse impact on economic development.

[0004] Therefore, it is of great significance to develop an insulating oil leakage inspection and repair device with stable performance and complete functions. Summary of the invention

[0005] The technical problem to be solved by the present invention is to solve the deficiencies in the prior art and to design a method and device for repairing transformer insulating oil leakage without draining oil.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] In a first aspect, the present invention provides a transformer insulating oil leakage free oil drainage maintenance method, comprising:

[0008] Adjust the internal oil pressure of the transformer to keep it balanced with the external atmospheric pressure;

[0009] Vacuum drying and exhausting of the transformer interior;

[0010] Conduct vacuum leakage rate test on transformer with oil;

[0011] The maintenance environment of the transformer is predicted based on the weather forecast system.

[0012] As a further technical solution of the present invention, the internal oil pressure of the regulating transformer is kept balanced with the external atmospheric pressure; specifically comprising:

[0013] The pressure transmitter monitors the oil pressure inside the transformer and feeds back the real-time monitored oil pressure data to the PLC control module;

[0014] The PLC control module controls the electric air extraction valve and the air control valve based on a preset oil pressure threshold and received oil pressure data.

[0015] As a further technical solution of the present invention, vacuum drying and exhausting the inside of the transformer specifically comprises:

[0016] The PLC control module adjusts the working state of the vacuum device according to the preset exhaust steps, connects with the transformer respirator through the exhaust pipe and the air pipe joint, and extracts the air and moisture inside the transformer;

[0017] The air inside the transformer is condensed when it is drawn out through the condensation tank;

[0018] The vacuum degree inside the transformer is monitored in real time, and the collected vacuum degree data is transmitted to the storage module.

[0019] As a further technical solution of the present invention, the PLC control module adjusts the working state of the vacuum device according to the preset exhaust steps, connects with the transformer respirator through the exhaust pipe and the air pipe joint, and extracts the air and moisture inside the transformer; specifically includes:

[0020] Exhaust the detection pipeline and start the vacuum device to evacuate the vacuum extraction unit pipeline;

[0021] After the vacuuming is completed, keep it unchanged for a certain period of time to determine whether the vacuum degree and the pressure value of the oil leakage point have changed;

[0022] If there is any change, it is judged that there is oil leakage and the leakage point should be treated.

[0023] As a further technical solution of the present invention, after the vacuuming is completed, the vacuum degree and the pressure value of the oil seepage point are kept unchanged for a certain period of time to determine whether there are changes; specifically, it includes:

[0024] After the vacuuming is completed, the vacuum degree of the transformer body and the pressure at the oil leakage point are detected to obtain the first vacuum degree and the first oil leakage point pressure value;

[0025] Keep the detection device and transformer status when vacuuming is completed for 1 minute, and record the second vacuum degree of the transformer body and the second oil seepage point pressure value at the oil seepage point again;

[0026] The first vacuum degree and the second vacuum degree, the first oil seepage point pressure value and the second oil seepage point pressure value are compared. When the change range of the vacuum degree and the oil seepage point pressure value is greater than the set value, it is determined that the oil seepage point is

[0028] Oil leakage occurs.

[0029] As a further technical solution of the present invention, vacuum leakage rate detection is performed on the transformer in the oil-carrying state; specifically comprising:

[0030] When the vacuum degree of the transformer collected by the vacuum transmitter reaches the set value, a vacuum leakage rate detection start signal is sent;

[0031] The PLC control module analyzes and processes the collected vacuum data in real time and calculates the vacuum leakage rate of the transformer in the oil-filled state;

[0032] When the vacuum leakage rate exceeds the preset vacuum leakage rate threshold, the PLC control module triggers the alarm module to alarm.

[0033] As a further technical solution of the present invention, a vacuum leakage rate test is performed on the transformer in an oil-filled state; and the method further includes: a sealing test is performed on the transformer body; before the sealing test, the detection unit pipeline is removed, and the transformer body is vacuumed and maintained for a period of time;

[0034] Remove the vacuum pumping unit pipeline, close the oil storage tank valve, and fill the oil storage tank with dry air to release the vacuum;

[0035] The inside of the oil conservator bladder is pressurized and maintained for a leak-tightness test.

[0036] Furthermore, the inside of the oil storage tank capsule is pressurized and maintained for the sealing test, specifically, the air pressure inside the oil storage tank capsule is increased by 30kPa and maintained for 24 hours.

[0037] As a further technical solution of the present invention, the forecasting of the maintenance environment of the transformer according to the weather forecasting system specifically includes:

[0038] Acquire transformer ambient temperature and humidity data according to temperature and humidity sensors arranged around the transformer;

[0039] When the ambient temperature and humidity data during transformer maintenance exceeds the preset allowable working threshold, a stop maintenance alarm signal is issued;

[0040] The maintenance environment of the transformer is predicted based on the external meteorological data obtained by the networking module.

[0041] In a second aspect, the present invention also provides a transformer insulating oil leakage free oil drain repair device, comprising:

[0042] Internal and external oil pressure balance adjustment unit, used to adjust the internal oil pressure of the transformer to maintain balance with the external atmospheric pressure;

[0043] Vacuum drying and exhaust unit, which performs vacuum drying and exhaust on the inside of the transformer;

[0044] Vacuum leakage rate detection unit, to detect vacuum leakage rate of transformer with oil;

[0045] The weather forecast unit predicts the maintenance environment of the transformer based on the weather forecast system.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] 1. The introduction of the internal and external oil pressure balance adjustment system effectively solves the problem of air intake or oil leakage caused by the imbalance of internal and external oil pressure during the maintenance of the transformer. Ensure the tightness of the transformer during the maintenance process to prevent damage to the equipment caused by air intake or oil leakage. This not only extends the service life of the transformer, but also reduces the maintenance cost caused by oil leakage and the pollution of the insulating oil to the environment. By automatically adjusting the oil pressure, the system can quickly reach the oil pressure state suitable for maintenance, reducing the time and complexity of manual adjustment. This not only saves labor costs, but also improves the efficiency of maintenance work, allowing the transformer to resume operation faster and meet the needs of the power system. Improve the accuracy and reliability of maintenance work.

[0048] 2. Introduce vacuum drying and exhaust system to provide professional vacuum drying service for transformers after installation and maintenance. Through the vacuum drying process, the system can effectively remove moisture and humidity inside the transformer, thereby significantly improving its insulation performance and stability. At the same time, the vacuum environment helps to eliminate bubbles and gaps in the insulation material, enhance insulation strength and durability. In addition, vacuum drying can also improve the thermal stability and electrical performance of the transformer, reduce oxidation and corrosion rates, and extend service life.

[0049] 3. Vacuum leakage rate detection can accurately calculate the vacuum leakage rate of the transformer by real-time monitoring of the vacuum degree changes of the transformer in the oil-filled state. Once the leakage rate exceeds the preset threshold, the system will immediately trigger the alarm mechanism and notify the maintenance personnel to handle it. This not only reduces the risk of human operation, but also ensures the maintenance quality and safety of the transformer.

[0050] 4. Through the weather forecast system, the temperature and humidity in the working environment of the transformer and the weather conditions in the next few hours within a few kilometers can be monitored in real time and accurately analyzed. By deploying high-precision sensors and accessing external meteorological data sources, the system can collect and analyze relevant data in real time, providing strong support for the operation and maintenance of the transformer. Before the arrival of severe weather, the system can also issue early warnings to remind maintenance personnel to make corresponding protection and preparations, thereby improving the operational stability and safety of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a flow chart of the transformer insulation oil leakage free oil drainage maintenance method proposed by the present invention;

[0052] Figure 2 This is a schematic diagram of the transformer insulation oil leakage and oil drainage-free maintenance installation proposed by the present invention;

[0053] Figure 3 A flow chart of a specific embodiment of the present invention;

[0054] Figure 4 A schematic diagram of the main electrical circuit provided by an embodiment of the present invention;

[0055] Figure 5 is a schematic diagram of an electrical control circuit according to an embodiment of the present invention;

[0056] Figure 6 This is the control circuit diagram of the pressure transmitter;

[0057] Figure 7 This is a diagram of the electrical control structure of the transformer insulation oil leakage free oil drain maintenance proposed in an embodiment of the present invention;

[0058] Figure 8 This is a structural diagram of the transformer insulating oil leakage and oil-drainage-free maintenance device proposed by the present invention. DETAILED DESCRIPTION

[0059] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and embodiments:

[0060] It should be noted that the structures, colors, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0061] like Figure 1 As shown, the present invention provides a transformer insulating oil leakage free oil drainage maintenance method, comprising:

[0062] Step 101, adjusting the internal oil pressure of the transformer to maintain a balance with the external atmospheric pressure;

[0063] Step 102, vacuum drying and exhausting the inside of the transformer;

[0064] Step 103, performing vacuum leakage rate detection on the transformer in an oil-filled state;

[0065] Step 104: predicting the maintenance environment of the transformer according to the weather forecast system.

[0066] In the embodiment of the present invention, the vacuum pumping unit pipeline, the detection unit pipeline and the pressure detection device are installed on the transformer body, wherein the vacuum pumping unit pipeline is connected to the vacuum device, and the pressure detection device is adsorbed on the oil leakage point to be tested and maintained at the same horizontal height as the oil leakage point. By adjusting the internal oil pressure of the transformer to keep balance with the external atmospheric pressure, the internal and external pressure balance adjustment of the transformer insulating oil leakage position is achieved, ensuring that air is avoided during the maintenance process, improving the maintenance quality, and effectively dealing with the air and moisture that may exist inside the transformer by vacuum drying and exhausting the inside of the transformer, thereby improving the insulation performance of the transformer; by performing vacuum leakage rate detection on the transformer with oil, ensuring that the transformer does not leak oil after the maintenance is completed, thereby extending the service life of the transformer; the temperature, humidity and weather conditions of the surrounding environment of the transformer can be collected through the weather forecast system to determine whether the transformer can be repaired, and at the same time, the operating environment of the transformer can be predicted according to the weather forecast, thereby improving the efficiency of the transformer leakage maintenance work.

[0067] See also Figure 2 In step 101, the internal oil pressure of the transformer is adjusted to maintain a balance with the external atmospheric pressure; specifically, the steps include:

[0068] The pressure transmitter 1 monitors the oil pressure inside the transformer and feeds back the real-time monitored oil pressure data to the PLC control module;

[0069] The PLC control module controls the electric air extraction valve V31 and the air control valve V32 based on a preset oil pressure threshold and received oil pressure data.

[0070] In the embodiment of the present invention, the internal and external oil pressure balance adjustment system is to ensure that the internal oil pressure of the transformer is balanced with the external atmospheric pressure during the oil leakage defect inspection and repair process. The system is mainly composed of an electric air extraction valve V31, an air control valve V32, a pressure transmitter 1, a vacuum device 2 and a PLC control module, which work together to achieve automatic adjustment of the oil pressure balance.

[0071] See also Figure 3When starting maintenance, maintenance personnel must carefully check and correctly install key components such as transformer insulating oil leakage maintenance equipment, pressure transmitters, pipeline connectors, oil pipes and exhaust pipes. At the same time, ensure the safe layout of the AC380V power supply and the reliability of its power supply; confirm that the power connection of the transformer insulating oil leakage maintenance equipment is normal and the grounding is reliable; carefully check each component and pipeline of the maintenance equipment to confirm that there is no damage or leakage; if damage or leakage is found, necessary replacement or repair should be carried out immediately.

[0072] The transformer pressure sealing test and operation record are used to confirm the specific location and quantity of transformer oil leakage defects; to ensure the smooth progress of maintenance work, oil samples should be collected for testing and analysis before maintenance, and the required sealing materials and related maintenance tools should be fully prepared.

[0073] At the oil filling valve position of V11 at the bottom of the oil tank, a joint oil guide pipe should be installed and connected to the pressure transmitter. When the V11 valve is opened, the gas inside the pipeline is discharged. After that, it is necessary to ensure that the pressure transmitter is securely adsorbed next to the oil leakage defect position and the two are kept on the same horizontal line.

[0074] Open the V12, V13, V14, V21, V22, and V23 valves of the transformer; connect the exhaust pipe of the transformer oil leakage maintenance device to the respirator interface of the main oil storage cabinet, and open the V31 and V32 valves of the maintenance device at the same time.

[0075] Select the oil pressure balance adjustment system, first set the relevant parameters through the touch screen, including vacuum start and stop pressure value, pressure differential value, etc. Then, after the device is started, the vacuum pump starts to operate, and the air inside the oil storage cabinet is extracted through the exhaust pipeline to make the inside of the transformer oil leakage point reach the preset "0" pressure state. After ensuring that the transformer oil pressure is stable for 1 minute, the leaking parts can be inspected with oil.

[0076] During the transformer maintenance process, the pressure transmitter will continuously monitor the changes in the oil pressure inside the transformer and feed back the real-time monitored oil pressure data to the PLC control module. The PLC control module accurately controls the electric exhaust valve and the air control valve based on the preset oil pressure threshold and the received oil pressure data.

[0077] When the system detects that the internal oil pressure at the oil defect location is higher than the preset threshold, the PLC control module will immediately instruct the electric air extraction valve to open, thereby starting the air extraction process. When the internal pressure is equal to the external atmospheric pressure, the electric air extraction valve automatically closes. If the pressure detected by the pressure monitoring system is lower than the atmospheric pressure, the air control valve will respond after 10 seconds, and the PLC controller will issue an adjustment command to command the inflation valve to open and inject air until the internal and external pressures are completely balanced.

[0078] After completing the previous oil leakage inspection, continue to perform the following procedures for the remaining oil leakage inspections of the transformer: first, release the vacuum of the transformer oil storage cabinet and the inside of the transformer body; second, ensure that the pressure transmitter is accurately adsorbed at the position of the oil leakage point to be detected and maintain the same horizontal line with it; finally, repeat the above-mentioned operating steps of the oil pressure balance adjustment system until all oil leakage inspections of the transformer are completed.

[0079] During the whole process, the PLC control module will continuously monitor the changes in oil pressure and make real-time adjustments to the electric air extraction valve and the air control valve according to the actual situation to ensure that the oil pressure inside and outside the transformer is always balanced. This automatic control method not only improves the response speed of the system, but also reduces the need for human intervention, thereby improving the operational stability and safety of the transformer.

[0080] In addition, the system also has a fault alarm function. When the system detects any abnormal situation or fault, it will immediately trigger the alarm mechanism to notify maintenance personnel to handle it. This helps to detect and solve potential problems in a timely manner and ensure the normal operation of the transformer.

[0081] In step 102, vacuum drying and exhausting are performed on the inside of the transformer; specifically, the steps include:

[0082] The PLC control module adjusts the working state of the vacuum device according to the preset air extraction steps, connects with the transformer respirator 3 through the air extraction pipe and the air pipe joint, and extracts the air and moisture inside the transformer;

[0083] The air inside the transformer is condensed when it is drawn out through the condensation tank 4;

[0084] The vacuum degree inside the transformer is monitored in real time through the vacuum detection system, and the collected vacuum degree data is transmitted to the storage module.

[0085] The present invention is based on a PLC control module and combines the vacuum device exhaust capabilities of a high-efficiency vacuum pump and a Roots pump to achieve deep drying and thorough exhaust of the inside of the transformer.

[0086] After the system is started, the PLC control module will gradually adjust the working status of the vacuum pump and Roots pump according to the preset exhaust program. These pumps are connected to the transformer respirator through the exhaust pipe and the air pipe joint to extract the air and moisture inside the transformer. In the exhaust process, the condenser plays a key role. It can quickly condense the vapor in the gas into liquid, effectively preventing oil vapor from entering the vacuum pump, thereby protecting the service life and performance of the vacuum pump.

[0087] After completing the entire oil leakage inspection process, close the V11 oil filling valve and remove components such as the pressure transmitter, connector, and oil guide pipe. To ensure that the air that may invade the interior of the transformer is completely eliminated, a vacuum pump and a Roots pump are used for vacuum drying and exhaust. When the detection device detects that the vacuum degree drops below 200Pa, close the V32 valve, then enter the transformer-related data on the touch screen, and then start the vacuum leakage rate test of the transformer with oil. After the vacuum leakage rate test is qualified, the V32 valve will be reopened and vacuum extraction will continue. When the device monitors that the vacuum degree drops below 100Pa, it will maintain a high vacuum state for 1 to 2 hours to achieve the effect of vacuum drying and exhaust.

[0088] See also Figure 4 , is a schematic diagram of the electrical main circuit provided by an embodiment of the present invention, the vacuum pump and the Roots pump are connected to the main power supply line through a fast fuse and a relay, and a phase sequence protector is also provided on the main circuit power supply line to protect the power supply phase sequence, see Figure 5 This is a schematic diagram of the electrical control circuit of an embodiment of the present invention. The control module uses a CPUSR20 processor to control the output of the vacuum pump, Roots pump and display screen; Figure 6 This is the control circuit diagram of the pressure transmitter. The pressure transmitter is used to detect the liquid level and obtain the pressure information inside the transformer. Figure 7 This is a diagram of the electrical control structure of the transformer insulating oil leakage and oil drainage-free maintenance proposed in an embodiment of the present invention.

[0089] The operation process of the entire vacuum drying and exhaust system is based on the precise control and real-time monitoring of the PLC control module, which improves the operating efficiency of the system, reduces the risk of human operation, and ensures the maintenance quality of the transformer.

[0090] Among them, the PLC control module adjusts the working state of the vacuum device according to the preset exhaust steps, connects with the transformer respirator through the exhaust pipe and the air pipe joint, and extracts the air and moisture inside the transformer; specifically includes:

[0091] Exhaust the detection pipeline and start the vacuum device to evacuate the vacuum extraction unit pipeline;

[0092] After the vacuuming is completed, keep it unchanged for a certain period of time to determine whether the vacuum degree and the pressure value of the oil leakage point have changed;

[0093] If there is any change, it is judged that there is oil leakage and the leakage point should be treated.

[0094] In the embodiment of the present invention, after the vacuuming is completed, the vacuum degree and the pressure value of the oil seepage point are kept unchanged for a certain period of time to determine whether there are changes; specifically, the following steps are included:

[0095] After the vacuuming is completed, the vacuum degree of the transformer body and the pressure at the oil leakage point are detected to obtain the first vacuum degree and the first oil leakage point pressure value;

[0096] Keep the detection device and transformer status when vacuuming is completed for 1 minute, and record the second vacuum degree of the transformer body and the second oil seepage point pressure value at the oil seepage point again;

[0097] The first vacuum degree and the second vacuum degree, the first oil seepage point pressure value and the second oil seepage point pressure value are compared. When the variation range of the vacuum degree and the oil seepage point pressure value is greater than the set value, it is determined that oil seepage occurs at the oil seepage point.

[0098] Specifically, when the change range of the vacuum degree and the oil leakage point pressure value is greater than the set value, it is judged that oil leakage occurs at the oil leakage point, specifically:

[0099] When the change amplitude of vacuum degree is greater than 5% and the change amplitude of pressure value at the oil seepage point is greater than 2kPa, it is judged that oil seepage occurs at the oil seepage point.

[0100] In step 103, a vacuum leakage rate test is performed on the transformer in an oil-filled state; specifically, the test includes:

[0101] When the vacuum degree of the transformer collected by the vacuum transmitter reaches the set value, a vacuum leakage rate detection start signal is sent;

[0102] The PLC control module analyzes and processes the collected vacuum data in real time and calculates the vacuum leakage rate of the transformer in the oil-carrying state;

[0103] When the vacuum leakage rate exceeds the preset vacuum leakage rate threshold, the PLC control module triggers the alarm module to alarm.

[0104] After the system is started, the vacuum degree of the transformer is first monitored in real time through the vacuum transmitter. When the vacuum inside the transformer is evacuated to below 200Pa, the system will issue an indication that a vacuum leakage rate detection is required. After confirming the signal, the PLC control module will start the leakage rate detection program. This program can perform vacuum leakage rate detection when the transformer is in the oil-filled state. At the same time, the vacuum detection sensor will continue to monitor the changes in the vacuum degree inside the transformer to evaluate its leakage.

[0105] During the detection process, the PLC control module will analyze and process the collected vacuum data in real time. By comparing the vacuum data at different time points, the system can accurately calculate the vacuum leakage rate of the transformer in the oil-filled state.

[0106] If the test results show that the leakage rate exceeds the preset threshold, the PLC control module will immediately trigger the alarm mechanism and notify the maintenance personnel to handle it. At the same time, the system will also record and save the relevant test data for subsequent analysis.

[0107] The oil-containing vacuum leakage rate detection system is based on precise vacuum measurement and monitoring technology, combined with the intelligent processing of the PLC control module, to achieve efficient and accurate detection of the vacuum leakage rate of the transformer in the oil-containing state; improve the maintenance efficiency and quality of the transformer, reduce the risk of oil leakage incidents in the future, and ensure the safe and stable operation of the power system.

[0108] The calculation formula for leakage detection is programmed into the programmable logic controller (PLC), and combined with the key parameters such as the weight, density, deduction time and test time of the transformer insulation oil under maintenance, it is possible to monitor in real time whether the transformer vacuum leakage rate meets the qualified standard. The calculation formula for transformer vacuum leakage rate detection is: η=(P2-Pl)×V÷t, where η represents the leakage rate (unit: less than 1000Pa.L / s); after closing the V32 valve, it is necessary to maintain the closed state for 10 minutes, record the first measured pressure value Pl (unit: Pa); then record the second pressure value P2 (unit: Pa); V represents the volume of transformer oil (unit: L); M represents the amount of transformer oil (unit: M); ρ represents the transformer oil density, in kilograms per liter (kg / L), which can be 0.9kg / L, then V=M÷ρ; t represents the time interval between two pressure recordings (unit: s).

[0109] In the embodiment of the present invention, the vacuum leakage rate of the transformer is detected in the oil-carrying state; and the method further includes: performing a sealing test on the transformer body; before performing the sealing test, the detection unit pipeline is removed, and the transformer body is vacuumed and maintained for a period of time;

[0110] Remove the vacuum pumping unit pipeline, close the oil storage tank valve, and fill the oil storage tank with dry air to release the vacuum;

[0111] The inside of the oil conservator bladder is pressurized for a leak-tightness test.

[0112] After completing all the oil leakage inspection processes, in order to ensure that the sealing performance of the transformer is verified, a static pressure of 30kPa should be applied to the oil surface on the top of the oil conservator using dry air or nitrogen for a sealing test. The test should last for 24 hours. During this period, the pressure of the filled gas must be closely monitored for significant fluctuations. At the same time, a comprehensive and detailed inspection should be carried out to determine whether there is any oil leakage. After the test, all gases should be exhausted, and then a respirator should be installed and kept stationary for no less than 12 hours. During this process, all parts of the transformer should be exhausted until the gas is completely exhausted.

[0113] After the oil sample test results confirm that they meet the specified standards, the construction site will be cleaned up and the tools and equipment will be counted. After that, the maintenance personnel will evacuate the work site, and the transformer can be put into operation.

[0114] During the entire maintenance process, maintenance personnel can view the device's working status, parameter settings, and fault information in real time through the touch screen, so as to promptly discover and handle problems. At the same time, the device's intelligent control system can automatically record various data during the maintenance process, providing strong data support for subsequent maintenance work.

[0115] In addition, the device also has a variety of safety protection functions, such as overload protection, overvoltage protection, undervoltage protection, etc., to ensure the safety and reliability of maintenance work. At the same time, the device also uses environmentally friendly materials and meets environmental protection requirements, providing a safer, more reliable and efficient solution for transformer maintenance work.

[0116] In step 104, the transformer operating status is monitored according to the weather forecast system, specifically including:

[0117] Acquire transformer ambient temperature and humidity data based on temperature and humidity sensors arranged around the transformer;

[0118] When the ambient temperature and humidity data during transformer maintenance exceeds the preset allowable working threshold, a stop maintenance alarm signal is issued;

[0119] The maintenance environment of the transformer is predicted based on the external meteorological data obtained by the networking module.

[0120] The weather forecast system integrates temperature and humidity sensor technology, intelligent weather query system, data processing capabilities and intelligent analysis algorithms to achieve real-time monitoring and accurate analysis of the temperature and humidity in the transformer working environment and the weather conditions in the next few hours within a few kilometers.

[0121] First, temperature and humidity sensors are deployed at key locations to continuously collect temperature and humidity data around the transformer. These sensors have high precision and high stability, which can ensure the accuracy and reliability of the data. At the same time, the 4G networking module system also obtains real-time weather conditions within a few kilometers by accessing external meteorological data sources, including temperature, wind speed, wind direction, rainfall, etc.

[0122] The collected data will be transmitted to the PLC control unit, the core of which is the high-performance data processing module and intelligent analysis algorithm. The data processing module is responsible for cleaning, converting and storing the raw data for subsequent analysis and application. The intelligent analysis algorithm uses this data, combined with historical data, empirical knowledge and predefined rules, to conduct in-depth analysis and prediction.

[0123] In terms of temperature and humidity monitoring, the system can detect the temperature and humidity changes near the transformer in real time and issue warnings based on preset thresholds. Once the humidity exceeds the allowable range, the system will immediately issue a warning signal to notify maintenance personnel to stop maintenance work. This helps prevent the transformer's insulation performance from deteriorating due to excessive humidity.

[0124] In addition, the system will also predict and evaluate the operating environment of the transformer based on real-time weather conditions. For example, before the oncoming severe weather (such as heavy rain, strong winds, etc.), the system can issue an early warning to prompt maintenance personnel to make corresponding protective and preparation work.

[0125] The operation process of the entire intelligent control system is based on the collection, transmission, processing and analysis of real-time data. Through intelligent monitoring and analysis, the system can achieve comprehensive control of the transformer operating environment, improve the transformer's operating stability and safety, and reduce the probability of failure.

[0126] After the overhaul is completed, an oil sample test is carried out. When the oil sample test is qualified, the transformer is put into operation. After the sealing test is completed, the gas in the capsule is discharged and the transformer body is left to stand for no less than 12 hours; the transformer bushing, riser, radiator, and gas relay are deflated multiple times until the gas is exhausted and the overhaul is completed; take the oil for test, and when the oil sample is qualified, the transformer is put into operation.

[0127] See also Figure 8 The present invention also provides a transformer insulating oil leakage free oil draining maintenance device, comprising:

[0128] Internal and external oil pressure balance adjustment unit 201, used to adjust the internal oil pressure of the transformer to keep it balanced with the external atmospheric pressure;

[0129] A vacuum drying and exhaust unit 202 is used to vacuum dry and exhaust the inside of the transformer;

[0130] A vacuum leakage rate detection unit 203 performs vacuum leakage rate detection on the transformer in an oil-filled state;

[0131] The weather prediction unit 204 predicts the maintenance environment of the transformer according to the weather prediction system.

[0132] The present invention proposes a device with intelligent oil pressure balance adjustment, vacuum drying and exhaust, and oil vacuum leak detection functions, in order to effectively solve the problem of transformer insulating oil leakage in a simple structure, low cost, and easy maintenance method. The present invention can not only monitor the oil pressure status of the transformer in real time, and automatically adjust the oil pressure balance according to the oil pressure change, solve the air problem that may exist inside the transformer during the maintenance process, and perform oil vacuum leak detection on the transformer after the maintenance is completed, so as to effectively prevent the transformer from leaking oil again. At the same time, the device also has the characteristics of intelligence and automation, which can significantly reduce the labor intensity of the staff and greatly improve the work efficiency of power transformer leakage maintenance. Compared with the traditional power outage oil drainage maintenance method, the work efficiency is improved by about 80%.

[0133] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for repairing transformer insulating oil leakage without draining oil, characterized by: include: Adjust the internal oil pressure of the transformer to keep it balanced with the external atmospheric pressure; Vacuum drying and exhausting of the transformer interior; Conduct vacuum leakage rate test on transformer with oil; The maintenance environment of the transformer is predicted based on the weather forecast system.

2. The transformer insulating oil leakage and oil drain-free maintenance method according to claim 1 is characterized in that: The internal oil pressure of the regulating transformer is kept balanced with the external atmospheric pressure; specifically comprising: The pressure transmitter monitors the oil pressure inside the transformer and feeds back the real-time monitored oil pressure data to the PLC control module; The PLC control module controls the electric air extraction valve and the air control valve based on a preset oil pressure threshold and received oil pressure data.

3. The transformer insulating oil leakage and oil drain-free maintenance method according to claim 1 is characterized in that: The vacuum drying and exhausting of the transformer interior specifically includes: The PLC control module adjusts the working state of the vacuum device according to the preset exhaust steps, connects with the transformer respirator through the exhaust pipe and the air pipe joint, and extracts the air and moisture inside the transformer; The air inside the transformer is condensed when it is drawn out through the condensation tank; The vacuum degree inside the transformer is monitored in real time, and the collected vacuum degree data is transmitted to the storage module.

4. The transformer insulating oil leakage and oil drain-free maintenance method according to claim 3 is characterized in that: The PLC control module adjusts the working state of the vacuum device according to the preset exhaust steps, connects with the transformer respirator through the exhaust pipe and the air pipe joint, and extracts the air and moisture inside the transformer; specifically includes: Exhaust the detection pipeline and start the vacuum device to evacuate the vacuum extraction unit pipeline; After the vacuuming is completed, keep it unchanged for a certain period of time to determine whether the vacuum degree and the pressure value of the oil leakage point have changed; If there is any change, it is judged that there is oil leakage and the leakage point should be treated.

5. The transformer insulating oil leakage and oil drain-free maintenance method according to claim 4 is characterized in that: After the vacuuming is completed, the vacuum degree and the pressure value of the oil seepage point are kept unchanged for a certain period of time to determine whether there are changes; specifically including: After the vacuuming is completed, the vacuum degree of the transformer body and the pressure at the oil leakage point are detected to obtain the first vacuum degree and the first oil leakage point pressure value; Keep the detection device and transformer status when vacuuming is completed for 1 minute, and record the second vacuum degree of the transformer body and the second oil seepage point pressure value at the oil seepage point again; The first vacuum degree and the second vacuum degree, the first oil seepage point pressure value and the second oil seepage point pressure value are compared. When the variation range of the vacuum degree and the oil seepage point pressure value is greater than the set value, it is determined that oil seepage occurs at the oil seepage point.

6. The transformer insulating oil leakage and oil drain-free maintenance method according to claim 1 is characterized in that: Conduct vacuum leakage rate test on transformer with oil; specifically include: When the vacuum degree of the transformer collected by the vacuum transmitter reaches the set value, a signal to start vacuum leakage rate detection is sent; The PLC control module analyzes and processes the collected vacuum data in real time and calculates the vacuum leakage rate of the transformer in the oil-carrying state; When the vacuum leakage rate exceeds the preset vacuum leakage rate threshold, the PLC control module triggers the alarm module to alarm.

7. The transformer insulating oil leakage and oil drain-free maintenance method according to claim 6 is characterized in that: Conduct vacuum leakage rate test on the transformer with oil; also include: conduct sealing test on the transformer body; before conducting the sealing test, remove the detection unit pipeline, and evacuate the transformer body and keep it for a period of time; Remove the vacuum pumping unit pipeline, close the oil storage tank valve, and fill the oil storage tank with dry air to release the vacuum; The inside of the oil conservator bladder is pressurized and maintained for a leak-tightness test.

8. The transformer insulating oil leakage and oil drain-free maintenance method according to claim 7 is characterized in that: The sealing test of pressurizing the interior of the oil storage tank capsule and maintaining the pressure therein is specifically to increase the air pressure inside the oil storage tank capsule by 30 kPa and maintain the pressure therein for 24 hours.

9. The transformer insulating oil leakage and oil drain-free maintenance method according to claim 1 is characterized in that: The prediction of the maintenance environment of the transformer according to the weather prediction system specifically includes: Acquire transformer ambient temperature and humidity data based on temperature and humidity sensors arranged around the transformer; When the ambient temperature and humidity data during transformer maintenance exceeds the preset allowable working threshold, a stop maintenance alarm signal is issued; The maintenance environment of the transformer is predicted based on the external meteorological data obtained by the networking module.

10. Transformer insulation oil leakage free oil draining maintenance device, characterized by: The transformer insulating oil leakage and oil drain-free maintenance method according to any one of claims 1 to 9 comprises: Internal and external oil pressure balance adjustment unit, used to adjust the internal oil pressure of the transformer to maintain balance with the external atmospheric pressure; Vacuum drying and exhaust unit, which performs vacuum drying and exhaust on the inside of the transformer; Vacuum leakage rate detection unit, to detect vacuum leakage rate of transformer with oil; The weather forecast unit predicts the maintenance environment of the transformer based on the weather forecast system.

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