A device and method for online monitoring oil storage temperature of power transformer oil

Abstract

The present invention discloses an online monitoring device and method for oil storage temperature of power transformer oil, and relates to the technical field of transformer oil temperature monitoring. This technical solution mainly installs a group of online monitoring devices on the outside of the transformer structure of the prior art, and performs real-time monitoring and detection of the oil temperature inside the transformer body and the oil storage tank, and combines the Adam oil temperature prediction algorithm to predict the oil temperature inside the transformer body, and timely controls the exhaust flux of the respirator to ensure the working safety of each component inside the transformer body; the working detection module detects the oil temperature inside the transformer body, and the reference detection module detects the oil temperature inside the oil storage tank, and the two groups of oil temperature change laws are calculated, and then the oil temperature data inside the oil storage tank is used as the prediction basis, on the one hand, the change law of the oil temperature inside the transformer body is predicted, and on the other hand, the displacement controller and the gas valve adjustment mechanism are controlled according to the oil temperature change law to ensure the overall safety of the transformer equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer oil temperature monitoring, and in particular relates to an online monitoring device and method for oil storage temperature of a power transformer. Background Art

[0002] Transformer oil is mainly used to cool down the internal equipment components of power transformers and as an insulating medium. In actual work, when the transformer load increases or is abnormal, the windings inside the transformer usually generate a lot of heat, which will cause the transformer oil inside to expand due to heat. Therefore, in the daily maintenance and monitoring of transformers, workers can usually quickly determine the cause of the fault or the load condition only by the temperature change of the transformer oil; therefore, transformer oil temperature monitoring is extremely important;

[0003] In the prior art, the monitoring of transformer oil temperature is usually carried out offline, and the real-time monitoring data is often difficult to be processed and summarized in time. In addition, the existing monitoring devices often only have detection functions and cannot make relatively accurate predictions on the future trend of the oil temperature inside the transformer, making it difficult to prevent problems before they occur. In order to achieve these effects, we designed an online monitoring device and method for the oil storage temperature of a power transformer based on the prior art and combined with the Adam neural network algorithm. Summary of the invention

[0004] The purpose of the present invention is to provide an online monitoring device and method for the oil storage temperature of a power transformer oil, so as to solve the problem that the real-time data of the existing offline monitoring is difficult to be processed and summarized in time, and the future trend of the oil temperature inside the transformer cannot be predicted relatively accurately.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention is an online monitoring device and method for oil storage temperature of a power transformer, which is externally connected to the surface of the power transformer, and includes a central control box, a working detection module, a reference detection module, a gas valve regulating mechanism and a displacement controller, wherein the power transformer includes a transformer body, an oil storage tank and a respirator, and the working detection module, the reference detection module, the gas valve regulating mechanism and the displacement controller are all electrically connected to the central control box, wherein the working detection module is fixedly installed on the surface of the transformer body to monitor the internal oil temperature of the transformer, and the reference detection module is arranged inside the oil storage tank to monitor the internal oil temperature of the oil storage tank; the gas valve regulating mechanism and the displacement controller are both installed outside the oil storage tank, and the three are interconnected; the technical scheme is mainly based on the prior art A set of online monitoring devices is installed on the outside of the transformer structure. The oil temperature inside the transformer body and the oil storage tank is monitored and detected in real time. The oil temperature inside the transformer body is predicted in combination with the Adam oil temperature prediction algorithm, and the exhaust flux of the respirator is controlled in time to ensure the working safety of each component inside the transformer body; the working detection module detects the oil temperature inside the transformer body, and the reference detection module detects the oil temperature inside the oil storage tank, and the change laws of the two groups of oil temperatures are calculated, and then the oil temperature data inside the oil storage tank is used as the prediction basis. On the one hand, the change law of the oil temperature inside the transformer body is predicted, and on the other hand, the displacement controller and the gas valve adjustment mechanism are controlled according to the oil temperature change law to ensure the overall safety of the transformer equipment.

[0007] Further, the air valve regulating mechanism comprises a connecting beam, a starting block and a driven block, wherein the two opposite ends of the connecting beam are fixedly connected to the central control box and the air valve regulating mechanism respectively; a safety valve tube is welded and fixed on the upper surface of the oil storage tank, the lower surface of the connecting beam is bolted and fixed to the starting block, and the starting block and the driven block are both arranged inside the safety valve tube, wherein the driven block and the safety valve tube form a piston structure; a connecting spring is bolted and fixed between the starting block and the driven block, wherein the starting block is an electromagnet, and is magnetically attracted to the driven block when the starting block is energized; A pressure relief pipe is welded to one side of the safety valve pipe, and an exhaust pipe is welded to the other side of the safety valve pipe, wherein the pressure relief pipe is arranged above the exhaust pipe; the driven block and the pressure relief pipe cooperate with each other; combined with the above structure, there is a cavity between the oil level inside the oil storage tank and the top of the oil storage tank, when the oil inside the oil storage tank expands due to heat, the air in the cavity can be squeezed and discharged to the respirator, and when the respirator cannot bear the exhaust work, the air continues to expand and pushes the driven block to slide off the pressure relief pipe, so that the air continues to be discharged from the pressure relief pipe to relieve the pressure.

[0008] Furthermore, the displacement controller includes a control box and a drive motor, wherein the exhaust pipe runs through the control box and the two are internally connected; the upper surface of the control box is bolted and fixed to the drive motor, and the rotating shaft on the inner surface of the control box is connected to an adjusting shaft, and the opposite ends of the adjusting shaft extend to the outside of the control box, and are linked to the output shaft of the drive motor by installing a gear meshing structure; an adjusting wheel is welded and fixed to the circumferential side of the adjusting shaft, wherein the adjusting wheel is a fan-shaped wheel structure, and cooperates with the exhaust pipe; in combination with the above-mentioned technical solution, the drive motor starts after receiving the predicted oil temperature data and drives the adjusting wheel to rotate to the corresponding angle, controls the cross-sectional area of ​​the exhaust pipe, and thus changes the exhaust flux; when the emission flux per unit time is the largest, the drive motor is turned off, so that the adjusting wheel hovers to the current position and continues the exhaust work.

[0009] Furthermore, the working detection module includes a temperature detection tube, a display buoy and a sensing plate, wherein the lower end of the temperature detection tube extends to the interior of the transformer body, and the upper end abuts against the interior of the central control box, wherein the display buoy is arranged inside the temperature detection tube and slidably cooperates with the temperature detection tube; the display buoy includes a floating plate, a floating rod and a sensing head, wherein the floating rod is adhesively fixed between the floating plate and the sensing head, and the sensing head is arranged above the floating plate; one side of the temperature detection tube is welded and fixed to the sensing plate, and one side of the sensing plate extends to the interior of the temperature detection tube; the sensing plate includes a plurality of mutually parallel A photoresistor is provided, and a laser pen is bolted to one end of the sensing head, and the emitting end of the laser pen is facing the photoresistor; the sensing board is extended to the interior of the central control box through a wire, and an integrated control board is bolted to the inner surface of the central control box and is electrically connected to the sensing board; in order to collect the oil temperature data inside the transformer body, when the oil temperature rises, the transformer oil filled in the temperature probe tube also expands due to the heat, and uses its buoyancy on the floating plate to push the display buoy to rise, so that the laser pen illuminates the photoresistor at the corresponding position to send the corresponding oil temperature data to the integrated control board.

[0010] Furthermore, the reference detection module includes a detection board and a digital-to-analog converter, wherein the digital-to-analog converter is embedded in the wall of the oil storage tank, and the detection board is a thermistor, and is electrically connected to the integrated control board through an electrical conductive wire and a digital-to-analog converter; the internal oil temperature monitoring of the oil storage tank mainly utilizes the principle that the resistance value changes when the temperature of the thermistor changes, and the data is processed by the digital-to-analog converter, wherein the oil temperature data inside the oil storage tank is used as a reference sample of the oil temperature data inside the transformer body on the one hand, and as a basis for predicting the oil temperature in the next time period on the other hand.

[0011] Furthermore, the start block and the drive motor are both electrically connected to the integrated control board, wherein the start block and the drive motor cooperate with each other, and the drive motor is turned off when the start block is powered on; the integrated control board has built-in data processing chips, data transmission modules and storage media, wherein the data processing chip contains the Adam oil temperature prediction algorithm, and the data processing chip receives the oil temperature data inside the transformer body and the oil storage tank measured by the working detection module and the reference detection module, and then processes them through the Adam oil temperature prediction algorithm; the data transmission module includes a WIFI signal transceiver and a local area gateway, both of which receive the oil temperature data inside the transformer body and the oil storage tank measured by the working detection module and the reference detection module, and transmit the oil temperature data to the workbench system and the manual monitoring terminal in real time; the storage medium includes an SD flash memory card and an SSD solid state hard disk, both of which store the oil temperature data and send it to the data processing chip to provide operation data for the Adam oil temperature prediction algorithm.

[0012] A method for online detection of oil storage temperature of a power transformer oil comprises the following steps:

[0013] Step 1. During the normal operation of the transformer, the oil temperature inside the transformer body gradually rises due to the heat generated by the load and the eddy current of the internal winding magnetic field. The working detection module timely detects the temperature change, wherein the temperature detection tube is also filled with transformer oil and immersed in the transformer oil inside the transformer body. When the transformer oil inside the transformer body heats up, the oil temperature inside the temperature detection tube also expands due to the heat, and the buoyancy applied to the floating plate is utilized to make the display buoy rise as a whole, driving the laser pen on the surface of the sensing head to illuminate several photoresistors of the sensing plate, thereby sending the corresponding oil temperature data to the integrated control board; at the same time, the detection board located in the oil storage tank also changes in resistance after being heated, thereby changing the organization of the reference detection module connected to the monitoring device, changing the electrical signal sent to the integrated control board, and realizing the monitoring of the oil temperature inside the oil storage tank;

[0014] Step 2: After receiving the oil temperature data, the integrated control board integrates the oil temperature data in the transformer body and the oil storage tank through the Adam oil temperature prediction algorithm in the data processing chip to predict the oil temperature in the next period, and sends the predicted data to the components inside the oil temperature detection device and the external control party through the data transmission module;

[0015] Step 3: When the oil temperature inside the transformer body rises, the transformer oil inside the oil storage tank also expands due to the heat, and the air between the oil level and the top of the oil storage tank is discharged to the respirator through the exhaust pipe, and then discharged to the outside of the equipment through the respirator; when the air passes through the displacement controller, the drive motor is started because it receives the predicted oil temperature data for the next period sent by the integrated control board, wherein the drive motor is a servo motor, that is, after receiving the corresponding oil temperature signal, the adjustment wheel is rotated to change the exhaust cross-sectional area of ​​the exhaust pipe and adjust the exhaust flux;

[0016] Step 4: When the oil temperature inside the transformer body gradually rises, the air pressure inside the safety valve tube gradually increases, pushing the follower block to slide up until the follower block is completely separated from the pressure relief tube. The starter block is energized and magnetized, and uses magnetic attraction to firmly adsorb the follower block, ensuring that the pressure relief tube is fully opened, so that the air inside the safety valve tube is discharged as soon as possible, ensuring the internal pressure balance and safety performance of the transformer.

[0017] The present invention has the following beneficial effects:

[0018] This technical solution mainly installs a group of online monitoring devices on the outside of the transformer structure of the prior art, monitors and detects the oil temperature inside the transformer body and the oil storage tank in real time, predicts the oil temperature inside the transformer body in combination with the Adam oil temperature prediction algorithm, and timely controls the exhaust flux of the respirator to ensure the working safety of various components inside the transformer body; the working detection module detects the oil temperature inside the transformer body, and the reference detection module detects the oil temperature inside the oil storage tank, and the change laws of the two groups of oil temperatures are calculated, and then the oil temperature data inside the oil storage tank is used as the prediction basis. On the one hand, the change law of the oil temperature inside the transformer body is predicted, and on the other hand, the displacement controller and the gas valve adjustment mechanism are controlled according to the oil temperature change law to ensure the overall safety of the transformer equipment.

[0019] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 It is an installation distribution diagram of an online monitoring device for oil storage temperature of a power transformer oil of the present invention;

[0022] Figure 2 for Figure 1 Partial display diagram of Part A;

[0023] Figure 3 for Figure 1 A partial display of part B in the middle;

[0024] Figure 4 for Figure 1 A partial display of part C in the middle;

[0025] Figure 5 for Figure 1 A partial display of part D in the middle;

[0026] Figure 6 for Figure 1 A partial display of part E in the middle;

[0027] Figure 7 It is the internal structure diagram of the displacement controller of the present invention;

[0028] Figure 8 is the cost function change curve of the training data;

[0029] Fig. 9 Accuracy curve for prediction of training data;

[0030] Fig.10 is the cost function change curve of the test data;

[0031] Fig.11 Accuracy curve predicted for test data;

[0032] Fig.12 is the temperature measurement and predicted value curve;

[0033] Fig.13 is the error curve between the predicted value and the measured value.

[0034] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0035] 1. Central control box; 2. Transformer body; 3. Oil storage tank; 4. Breathing device; 5. Connecting beam; 6. Starting block; 7. Follower block; 8. Safety valve pipe; 9. Connecting spring; 10. Pressure relief pipe; 11. Exhaust pipe; 12. Control box; 13. Drive motor; 14. Adjusting shaft; 15. Adjusting wheel; 16. Temperature probe tube; 17. Display buoy; 18. Induction board; 19. Floating board; 20. Floating rod; 21. Induction head; 22. Photoresistor; 23. Laser pen; 24. Integrated control board; 25. Detection board; 26. Digital-to-analog converter. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0038] See also Figure 1-Figure 13 As shown, the present invention is an online monitoring device for oil storage temperature of a power transformer, which is externally connected to the surface of the power transformer, including a central control box 1, a working detection module, a reference detection module, a gas valve regulating mechanism and a displacement controller, wherein the power transformer includes a transformer body 2, an oil storage tank 3 and a respirator 4, the working detection module, the reference detection module, the gas valve regulating mechanism and the displacement controller are all electrically connected to the central control box 1, wherein the working detection module is fixedly installed on the surface of the transformer body 2 to monitor the internal oil temperature of the transformer, and the reference detection module is arranged inside the oil storage tank 3 to monitor the internal oil temperature of the oil storage tank 3; the gas valve regulating mechanism and the displacement controller are both installed outside the oil storage tank 3, and the three are interconnected; the technical scheme is mainly based on the transformer of the prior art A set of online monitoring devices is installed outside the transformer structure. The oil temperatures inside the transformer body 2 and the oil storage tank 3 are monitored and detected in real time. The oil temperature inside the transformer body 2 is predicted in combination with the Adam oil temperature prediction algorithm, and the exhaust flux of the respirator 4 is controlled in time to ensure the working safety of each component inside the transformer body 2. The working detection module detects the oil temperature inside the transformer body 2, and the reference detection module detects the oil temperature inside the oil storage tank 3, and the variation laws of the two sets of oil temperatures are calculated. Then, the oil temperature data inside the oil storage tank 3 is used as the prediction basis. On the one hand, the variation law of the oil temperature inside the transformer body 2 is predicted, and on the other hand, the displacement controller and the gas valve adjustment mechanism are controlled according to the oil temperature variation law to ensure the overall safety of the transformer equipment.

[0039] Preferably, the air valve regulating mechanism comprises a connecting beam 5, a starting block 6 and a driven block 7, wherein the two opposite ends of the connecting beam 5 are fixedly connected to the central control box 1 and the air valve regulating mechanism respectively; a safety valve tube 8 is welded and fixed on the upper surface of the oil storage tank 3, the lower surface of the connecting beam 5 is bolted and fixed to the starting block 6, and the starting block 6 and the driven block 7 are both arranged inside the safety valve tube 8, wherein the driven block 7 and the safety valve tube 8 form a piston structure; a connecting spring 9 is bolted and fixed between the starting block 6 and the driven block 7, wherein the starting block 6 is an electromagnet, and is magnetically attracted to the driven block 7 when the starting block 6 is energized; the safety valve A pressure relief pipe 10 is welded to one side of the tube 8, and an exhaust pipe 11 is welded to the other side and the respirator 4, wherein the pressure relief pipe 10 is arranged above the exhaust pipe 11; the driven block 7 cooperates with the pressure relief pipe 10; combined with the above structure, there is a cavity between the oil level inside the oil storage tank 3 and the top of the oil storage tank 3, when the oil inside the oil storage tank 3 expands due to heat, the air in the cavity can be squeezed and discharged to the respirator 4, and when the respirator 4 cannot bear the exhaust work, the air continues to expand and pushes the driven block 7 to slide off the pressure relief pipe 10, so that the air continues to be discharged from the pressure relief pipe 10 to relieve the pressure.

[0040] Preferably, the displacement controller includes a control box 12 and a drive motor 13, wherein the exhaust pipe 11 passes through the control box 12 and the two are internally connected; the upper surface of the control box 12 is bolted and fixed to the drive motor 13, and the rotating shaft on the inner surface of the control box 12 is connected to an adjusting shaft 14, and the opposite ends of the adjusting shaft 14 extend to the outside of the control box 12, and are linked to the output shaft of the drive motor 13 by installing a gear meshing structure; an adjusting wheel 15 is welded and fixed to the side surface of the adjusting shaft 14, wherein the adjusting wheel 15 is a fan-shaped wheel structure, and cooperates with the exhaust pipe 11; in combination with the above-mentioned technical solution, the drive motor 13 starts after receiving the predicted oil temperature data and drives the adjusting wheel 15 to rotate to the corresponding angle, controls the cross-sectional area of ​​the exhaust pipe 11, and thus changes the exhaust flux; when the emission flux per unit time is the largest, the drive motor 13 is turned off, so that the adjusting wheel 15 hovers to the current position and continues the exhaust work.

[0041] Preferably, the working detection module includes a temperature detection tube 16, a display buoy 17 and a sensing plate 18, wherein the lower end of the temperature detection tube 16 extends to the interior of the transformer body 2, and the upper end abuts against the interior of the central control box 1, wherein the display buoy 17 is arranged inside the temperature detection tube 16 and slidably cooperates with the temperature detection tube 16; the display buoy 17 includes a floating plate 19, a floating rod 20 and a sensing head 21, wherein the floating rod 20 is adhered and fixed between the floating plate 19 and the sensing head 21, and the sensing head 21 is arranged above the floating plate 19; one side of the temperature detection tube 16 is welded and fixed to the sensing plate 18, and one side of the sensing plate 18 extends to the interior of the temperature detection tube 16; the sensing plate 18 includes a plurality of mutually The photoresistor 22 is connected in parallel, and a laser pen 23 is bolted and fixed at one end of the sensor head 21, and the emitting end of the laser pen 23 is facing the photoresistor 22; the sensor board 18 extends to the inside of the central control box 1 through a wire, and an integrated control board 24 is bolted and fixed on the inner surface of the central control box 1, and is electrically connected to the sensor board 18; in order to collect the oil temperature data inside the transformer body 2, when the oil temperature rises, the transformer oil filled in the temperature detection tube 16 also expands due to the heat, and uses its buoyancy on the floating plate 19 to push the display buoy 17 to rise, so that the laser pen 23 irradiates the photoresistor 22 at the corresponding position to send the corresponding oil temperature data to the integrated control board 24.

[0042] Preferably, the reference detection module includes a detection board 25 and a digital-to-analog converter 26, wherein the digital-to-analog converter 26 is embedded in the wall of the oil storage tank 3, the detection board 25 is a thermistor, and is electrically connected to the integrated control board 24 through the conductive wire and the digital-to-analog converter 26; the internal oil temperature monitoring of the oil storage tank 3 mainly utilizes the principle that the resistance value of the thermistor changes when the temperature changes, and the data is processed by the digital-to-analog converter 26, wherein the oil temperature data inside the oil storage tank 3 is used as a reference sample of the oil temperature data inside the transformer body 2 on the one hand, and as a basis for predicting the oil temperature in the next period of time on the other hand.

[0043] Preferably, the start block 6 and the drive motor 13 are both electrically connected to the integrated control board 24, wherein the start block 6 and the drive motor 13 cooperate with each other, and the drive motor 13 is turned off when the start block 6 is powered on; the integrated control board 24 has built-in data processing chips, data transmission modules and storage media, wherein the data processing chip contains the Adam oil temperature prediction algorithm, and the data processing chip receives the oil temperature data inside the transformer body 2 and the oil storage tank 3 measured by the working detection module and the reference detection module, and then processes the data through the Adam oil temperature prediction algorithm; the data transmission module includes a WIFI signal transceiver and a local area gateway, both of which receive the oil temperature data inside the transformer body 2 and the oil storage tank 3 measured by the working detection module and the reference detection module, and transmit the oil temperature data to the workbench system and the manual monitoring terminal in real time; the storage medium includes an SD flash memory card and an SSD solid state hard disk, both of which store the oil temperature data and send it to the data processing chip to provide operation data for the Adam oil temperature prediction algorithm; it should be additionally described that the traditional transformer top oil temperature prediction algorithm is usually a neural network algorithm, because its powerful nonlinear function approximation and fitting ability provide an effective means for nonlinear system modeling. Therefore, the neural network algorithm can be applied to the prediction of the top oil temperature of the transformer. The traditional neural network learning algorithm usually adopts SGD (stochastic gradient descent method), which is difficult to select network hyperparameters, has a fixed learning rate, a large number of iterations, and a large fluctuation in the accuracy of the prediction, which is difficult to meet engineering needs; this technical solution adopts the Adam optimization algorithm to establish an adaptive learning rate neural network to predict the top oil temperature of the transformer, that is, the Adam oil temperature prediction algorithm in the present invention;

[0044] Among them, this technical solution refers to the relevant theoretical basis in the paper "Prediction of Transformer Top Oil Temperature Based on Dynamic Thermal Circuit Model and Adam Algorithm Optimization Neural Network", takes 13 collected quantities of transformer status as input, top oil temperature as output, and establishes a neural function model. The hidden layer activation function uses LeakyRelu function, the output layer activation function uses Sigmoid function, the target error is set to 0.01, and the training process is as follows Figures 8 to 13 As shown;

[0045] From the training process diagram, we can see that the neural network optimized by the Adam optimization algorithm has a fast convergence speed. After 3 to 4 iterations, the probability of meeting the error requirement reaches more than 90%. At the same time, from the prediction results, we can see that the neural network optimized by the Adam optimization algorithm has a good effect on the dynamic prediction of the top oil temperature of the transformer with constantly changing working conditions. The maximum error of this method is <0.8℃, and the prediction accuracy is much higher than that of the Swift G thermal circuit model and the dynamic thermal circuit model prediction method.

[0046] A method for online detection of oil storage temperature of a power transformer oil comprises the following steps:

[0047] Step 1: During the normal operation of the transformer, the oil temperature inside the transformer body 2 gradually rises due to the heat generated by the load and the eddy current of the internal winding magnetic field. The working detection module timely detects the temperature change, wherein the temperature detection tube 16 is also filled with transformer oil and immersed in the transformer oil inside the transformer body 2. When the transformer oil inside the transformer body 2 heats up, the oil temperature inside the temperature detection tube 16 also expands due to the heat, and the buoyancy applied to the floating plate 19 is used to make the display buoy 17 rise as a whole, driving the laser pen 23 on the surface of the induction head 21 to illuminate the photoresistors 22 of the induction plate 18, thereby sending the corresponding oil temperature data to the integrated control board 24; at the same time, the detection board 25 located in the oil storage tank 3 also changes in resistance after being heated, thereby changing the organization of the reference detection module connected to the monitoring device, changing the electrical signal sent to the integrated control board 24, and realizing the monitoring of the oil temperature inside the oil storage tank 3;

[0048] Step 2: After receiving the oil temperature data, the integrated control board 24 integrates the oil temperature data in the transformer body 2 and the oil storage tank 3 through the Adam oil temperature prediction algorithm in the data processing chip to predict the oil temperature in the next period, and sends the predicted data to the components inside the oil temperature detection device and the external control party through the data transmission module;

[0049] Step 3: During the process of oil temperature rising inside the transformer body 2, the transformer oil inside the oil storage tank 3 also expands due to heat, and the oil level and the air inside the top of the oil storage tank 3 are discharged to the respirator 4 through the exhaust pipe 11, and then discharged to the outside of the equipment through the respirator 4; when the air passes through the displacement controller, the drive motor 13 is started because it receives the predicted oil temperature data for the next period sent by the integrated control board 24, wherein the drive motor 13 is a servo motor, that is, after receiving the corresponding oil temperature signal, the adjustment wheel 15 is rotated to change the exhaust cross-sectional area of ​​the exhaust pipe 11 and adjust the exhaust flux;

[0050] Step 4: When the oil temperature inside the transformer body 2 gradually rises, the air pressure inside the safety valve tube 8 gradually increases, pushing the driven block 7 to slide up until the driven block 7 is completely separated from the pressure relief tube 10. The starting block 6 is energized and magnetized, and uses the magnetic attraction to firmly adsorb the driven block 7, ensuring that the pressure relief tube 10 is fully opened, so that the air inside the safety valve tube 8 is discharged as soon as possible, ensuring the internal pressure balance and safety performance of the transformer.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An online monitoring device for oil storage temperature of a power transformer, externally connected to the surface of the power transformer, comprising a central control box (1), a working detection module, a reference detection module, a gas valve adjustment mechanism and a displacement controller, wherein the power transformer comprises a transformer body (2), an oil storage tank (3) and a respirator (4), characterized in that: The working detection module, the reference detection module, the gas valve regulating mechanism and the displacement controller are all electrically connected to the central control box (1), wherein the working detection module is fixedly mounted on the surface of the transformer body (2) to monitor the oil temperature inside the transformer, and the reference detection module is arranged inside the oil storage tank (3) to monitor the oil temperature inside the oil storage tank (3); the gas valve regulating mechanism and the displacement controller are both mounted outside the oil storage tank (3), and the three are interconnected; The air valve regulating mechanism comprises a connecting beam (5), a starting block (6) and a driven block (7), wherein opposite ends of the connecting beam (5) are fixedly connected to the central control box (1) and the air valve regulating mechanism respectively; a safety valve tube (8) is welded and fixed to the upper surface of the oil storage tank (3), the lower surface of the connecting beam (5) is bolted and fixed to the starting block (6), and the starting block (6) and the driven block (7) are both arranged inside the safety valve tube (8), wherein the driven block (7) and the safety valve tube (8) form a piston structure A connecting spring (9) is bolted and fixed between the starting block (6) and the driven block (7), wherein the starting block (6) is an electromagnet and is magnetically attracted to the driven block (7) when the starting block (6) is energized; a pressure relief pipe (10) is welded to one side of the safety valve pipe (8), and an exhaust pipe (11) is welded to the other side of the safety valve pipe (8) and is connected to the respirator (4), wherein the pressure relief pipe (10) is arranged above the exhaust pipe (11); the driven block (7) and the pressure relief pipe (10) cooperate with each other; The displacement controller comprises a control box (12) and a drive motor (13), wherein the exhaust pipe (11) passes through the control box (12) and the two are internally connected; the upper surface of the control box (12) is bolted and fixed to the drive motor (13), and the rotating shaft on the inner surface of the control box (12) is connected to an adjustment shaft (14), and the opposite ends of the adjustment shaft (14) extend to the outside of the control box (12) and are linked to the output shaft of the drive motor (13) by installing a gear meshing structure; an adjustment wheel (15) is welded and fixed to the side surface of the adjustment shaft (14), wherein the adjustment wheel (15) is a fan-shaped wheel structure and cooperates with the exhaust pipe (11); The working detection module comprises a temperature detection tube (16), a display buoy (17) and a sensing plate (18); the lower end of the temperature detection tube (16) extends to the interior of the transformer body (2), and the upper end abuts against the interior of the central control box (1), wherein the display buoy (17) is arranged inside the temperature detection tube (16) and slidably cooperates with the temperature detection tube (16); the display buoy (17) comprises a floating plate (19), a floating rod (20) and a sensing head (21), wherein the floating rod (20) is adhesively fixed between the floating plate (19) and the sensing head (21), and the sensing head (21) is arranged above the floating plate (19); one side of the temperature detection tube (16) is welded and fixed to the sensing plate (18), and one side of the sensing plate (18) extends to the interior of the temperature detection tube (16); The sensing board (18) comprises a plurality of photoresistors (22) connected in parallel with each other; a laser pen (23) is bolted and fixed to one end of the sensing head (21), and the emission end of the laser pen (23) faces the photoresistor (22); the sensing board (18) extends to the interior of the central control box (1) through a wire; an integrated control board (24) is bolted and fixed to the inner surface of the central control box (1) and is electrically connected to the sensing board (18); The start block (6) and the drive motor (13) are both electrically connected to the integrated control board (24), wherein the start block (6) and the drive motor (13) cooperate with each other, and when the start block (6) is powered on, the drive motor (13) is turned off; the integrated control board (24) has a built-in data processing chip, a data transmission module and a storage medium, wherein the data processing chip contains an Adam oil temperature prediction algorithm, and the data processing chip receives the oil temperature data of the inside of the transformer body (2) and the inside of the oil storage tank (3) measured by the working detection module and the reference detection module, and then performs calculation processing through the Adam oil temperature prediction algorithm; the data transmission module includes a WIFI signal transceiver and a local area gateway, both of which receive the oil temperature data of the inside of the transformer body (2) and the inside of the oil storage tank (3) measured by the working detection module and the reference detection module, and transmit the oil temperature data in real time to the workbench system and the manual monitoring terminal; the storage medium includes an SD flash memory card and an SSD solid state hard disk, both of which store the oil temperature data and send it to the data processing chip to provide calculation data for the Adam oil temperature prediction algorithm.

2. The on-line monitoring device for oil storage temperature of a power transformer oil according to claim 1 is characterized in that: The reference detection module comprises a detection board (25) and a digital-to-analog converter (26), wherein the digital-to-analog converter (26) is embedded in the wall of the oil storage tank (3), and the detection board (25) is a thermistor and is electrically connected to the integrated control board (24) via an electrical conductive wire and the digital-to-analog converter (26).

3. The detection method of the online monitoring device for oil storage temperature of a power transformer oil according to claim 1 is characterized in that: The following steps are involved: Step 1: During normal operation of the transformer, the oil temperature inside the transformer body (2) gradually rises due to heat generated by the load and the eddy current of the internal winding magnetic field. The working detection module promptly detects the temperature change. The temperature detection tube (16) is also filled with transformer oil and immersed in the transformer oil inside the transformer body (2). When the transformer oil inside the transformer body (2) rises in temperature, the oil temperature inside the temperature detection tube (16) also expands due to the heat. The buoyancy exerted by the temperature detection tube on the floating plate (19) causes the display buoy (17) to rise as a whole, driving the laser pen (23) on the surface of the sensing head (21) to illuminate the plurality of photoresistors (22) of the sensing plate (18), thereby sending the corresponding oil temperature data to the integrated control board (24); at the same time, the detection board (25) located in the oil storage tank (3) also changes in resistance after being heated, thereby changing the organization of the reference detection module connected to the monitoring device, changing the electrical signal sent to the integrated control board (24), and realizing the monitoring of the oil temperature inside the oil storage tank (3); Step 2: After receiving the oil temperature data, the integrated control board (24) integrates the oil temperature data in the transformer body (2) and the oil storage tank (3) through the Adam oil temperature prediction algorithm in the data processing chip to predict the oil temperature in the next period, and sends the predicted data to the components inside the oil temperature detection device and the external control party through the data transmission module; Step 3: When the oil temperature inside the transformer body (2) rises, the transformer oil inside the oil storage tank (3) also expands due to the heat, and the oil level and the air inside the top of the oil storage tank (3) are discharged to the respirator (4) through the exhaust pipe (11), and then discharged to the outside of the equipment through the respirator (4); when the air passes through the displacement controller, the drive motor (13) is started because it receives the predicted oil temperature data for the next period sent by the integrated control board (24), wherein the drive motor (13) is a servo motor, that is, after receiving the corresponding oil temperature signal, it rotates the adjustment wheel (15), changes the exhaust cross-sectional area of ​​the exhaust pipe (11), and adjusts the exhaust flux; Step 4: When the oil temperature inside the transformer body (2) gradually rises, the air pressure inside the safety valve tube (8) gradually increases, pushing the driven block (7) to slide upward until the driven block (7) is completely separated from the pressure relief tube (10). The starter block (6) is energized and magnetized, and uses magnetic attraction to firmly adsorb the driven block (7), ensuring that the pressure relief tube (10) is fully opened, so that the air inside the safety valve tube (8) is discharged as soon as possible, thereby ensuring the internal pressure balance and safety performance of the transformer.

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