Abnormal collaborative diagnosis device for oil level and temperature of transformer

Abstract

The invention belongs to the technical field of transformer safety monitoring, and particularly relates to a transformer oil level and temperature abnormity collaborative diagnosis device, which comprises a tubular main body, an oil level buoy mechanism, a signal acquisition mechanism and a main control mechanism, the oil level buoy mechanism comprises a floater and a sliding rod; the free end of the sliding rod is inserted into the tubular main body through the bottom of the tubular main body; a magnet is fixedly arranged at the free end of the sliding rod; the signal acquisition mechanism is fixed in the tubular main body; the signal acquisition mechanism comprises a plurality of magnetic sensors arranged along the axis direction of the tubular main body; the main control mechanism is used for performing oil level analysis according to data acquired by the plurality of magnetic sensors; the floater is further provided with an oil temperature sensor used for collecting the oil temperature and sending the oil temperature to the main control mechanism. The main control mechanism is further used for conducting comprehensive risk state analysis according to the current oil level and the current oil temperature and conducting corresponding processing according to the analysis result. According to the invention, the oil level of the transformer can be efficiently and accurately monitored in real time, and continuous, accurate and automatic monitoring of the oil level is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer safety monitoring, and in particular relates to a transformer oil level and temperature abnormality collaborative diagnosis device. Background Art

[0002] In the power system, the transformer is a key energy conversion device, and its stable operation is crucial to ensuring the safety of the power grid. The transformer is usually filled with insulating oil, which not only acts as an insulator, but also effectively dissipates heat to ensure the temperature control of the transformer under long-term operation. However, the stability of the transformer oil level is one of the important factors to ensure its normal operation. If the oil level is too high, it may cause the internal pressure of the transformer to increase, and even cause oil seepage or leakage; if the oil level is too low, it may affect the insulation performance and heat dissipation effect, and increase the risk of equipment failure. Therefore, real-time monitoring of the transformer oil level is particularly important.

[0003] At present, transformer oil level monitoring methods mostly rely on manual regular inspections. The method is to use an oil level gauge, rely on the oil level to push the piston rod of the oil level gauge up and down, and then use the naked eye to observe the color of the piston rod appearing on the pipe wiper window float from the observation window. If it is green, the oil level height is appropriate, and if it is red, the oil level height is insufficient. This method requires manual inspections to monitor the oil level information. This method is not only inefficient, but also difficult to detect abnormal changes in the oil level in time, especially in remote or inaccessible substations, where manual inspection is even more difficult. In addition, although some automated monitoring solutions exist, they are often complex in structure, expensive, and susceptible to environmental factors, such as oil level false alarms caused by temperature changes. Therefore, it is an urgent need in the industry to develop a transformer oil level and temperature abnormal collaborative diagnosis device with a simple structure, moderate cost, and high reliability. Especially in application scenarios where it is necessary to accurately judge oil level changes and timely warn of potential risks, existing monitoring technologies are difficult to meet the requirements of efficient, accurate, and real-time monitoring.

[0004] In summary, how to monitor the transformer oil level efficiently, accurately and in real time, realize continuous, precise and automatic monitoring of the oil level, and improve the safety of transformer operation and maintenance efficiency has become a problem that needs to be solved urgently. Summary of the invention

[0005] In view of the deficiencies of the above-mentioned prior art, the present invention provides a device for collaboratively diagnosing abnormalities of transformer oil level and temperature, which can monitor the transformer oil level efficiently, accurately and in real time, realize continuous, precise and automated monitoring of the oil level, and improve the safety of transformer operation and maintenance efficiency.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A transformer oil level and temperature abnormality cooperative diagnosis device comprises a tubular body, an oil level float mechanism, a signal acquisition mechanism and a main control mechanism; the signal acquisition mechanism communicates with the main control mechanism;

[0008] The oil level float mechanism includes a float and a slide rod; the float can float up and down with the oil level, and the float is fixed to one end of the slide rod; the free end of the slide rod is inserted into the tubular body through the bottom of the tubular body, and the slide rod and the tubular body can slide relative to each other along the axial direction of the tubular body; a magnet is fixed to the free end of the slide rod;

[0009] The signal collection mechanism is fixed inside the tubular body; the signal collection mechanism includes a plurality of magnetic sensors arranged along the axial direction of the tubular body; the main control mechanism is used to perform oil level analysis based on the collected data of the plurality of magnetic sensors;

[0010] The float is also equipped with an oil temperature sensor for collecting the oil temperature and sending it to the main control mechanism; the main control mechanism is also used to conduct a comprehensive risk status analysis based on the current oil level and oil temperature, and perform corresponding processing based on the analysis results.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. To use the device, first, install the tubular body of the device on the transformer oil tank. The installation position and installation method are the same as those of the existing oil level gauge, which will not be described in detail here.

[0013] Compared with the prior art, after the device is installed, the float will rise and fall synchronously with the rise and fall of the oil level. When the float rises and falls, the slide bar and the magnet on the slide bar will also rise and fall synchronously. In this process, the collected data of the multiple magnetic sensors arranged along the axial direction of the tubular body will also change. In this way, the multiple magnetic sensors arranged along the axial direction of the tubular body in the device can accurately sense the change in magnetic intensity when the magnet passes by. The main control mechanism can perform oil level analysis based on the collected data of the multiple magnetic sensors.

[0014] 2. Due to the real-time linkage between the float and the magnet, and the rapid response of the magnetic sensor to changes in magnetic intensity, the device can capture the change in the oil level at the moment of change, and immediately process and judge it through the main control mechanism. This real-time monitoring capability enables operation and maintenance personnel to detect abnormal changes in the oil level in a timely manner, so as to take corresponding maintenance measures and avoid potential safety hazards.

[0015] 3. Oil temperature is one of the important parameters of the transformer's operating status, which directly affects its insulation performance and heat dissipation effect. By integrating the oil temperature sensor on the float, the monitoring device can not only monitor the oil level, but also monitor the oil temperature at the same time, realizing comprehensive monitoring of the transformer's operating status and improving the accuracy and completeness of monitoring. By real-time monitoring of the oil temperature, operation and maintenance personnel can promptly detect abnormal oil temperature and take corresponding maintenance measures to avoid equipment damage or performance degradation caused by excessive oil temperature. This helps to improve the reliability and service life of the transformer and reduce operation and maintenance costs.

[0016] 4. The main control mechanism is also used to conduct a comprehensive risk status analysis based on the current oil level and oil temperature. Through the comprehensive risk status analysis, not only can the transformer oil level be effectively detected, but also, when an abnormal oil level occurs, specific original analysis can be conducted based on the oil level and oil level data, which can effectively improve the comprehensiveness and accuracy of monitoring.

[0017] In summary, the use of this device can monitor the oil level of the transformer efficiently, accurately and in real time, realize continuous, precise and automatic monitoring of the oil level, and improve the safety of transformer operation and maintenance efficiency.

[0018] Preferably, the collected oil level magnetic sensor variable is QH(x), and the oil temperature sensor variable is QT(y), wherein QH(x) represents the monitored oil level state of the transformer, and QT(y) represents the value of the oil temperature measured by the transformer; when the main control mechanism makes a comprehensive risk judgment:

[0019] If QH(x)<QH zd3 , QT(y)<QT zd3 , then a transformer oil leakage warning signal is generated and sent to the management platform;

[0020] Where QT zd3 is the preset normal oil temperature threshold, QH zd3 Check thresholds for preset oil leaks;

[0021] If QH(x)<QH zd2 , QT(y)>QT zd2 , then a transformer aging warning signal is generated and sent to the management platform;

[0022] If QH(x)<QH zd1 , QT(y)>QT zd1 , a transformer fault warning signal is generated and sent to the management platform;

[0023] In the formula, QH zd2 is the preset oil level secondary warning threshold, QH zd1 is the preset oil level first-level warning threshold, and QH zd3 ≥QHzd2 >QH zd1 ;QT zd2 QT is the preset oil temperature secondary warning threshold. zd1 is the preset oil temperature level 1 warning threshold, and QT zd3 ≤QT zd2 <QT zd1 .

[0024] If the oil temperature is lower than the normal oil temperature threshold QT zd3 And the oil level is lower than the oil level replenishment threshold QH zd3 , it means that the oil temperature is normal but the oil volume is insufficient. This situation is likely caused by transformer oil leakage. Therefore, a transformer oil leakage warning signal is generated and sent to the management platform to let the operation and maintenance personnel understand the situation and check the situation in time (such as draining the oil, repairing and refilling the oil).

[0025] If the oil temperature is higher than the oil temperature secondary warning threshold QT zd2 And the oil level is lower than the oil level second warning threshold QH zd2 , it means that the temperature is too high and the oil level is too low. This situation is likely caused by transformer aging. Therefore, a transformer aging warning signal is generated and sent to the management platform to let the operation and maintenance personnel understand the situation and check in time to confirm whether it is transformer aging, so as to solve the problem.

[0026] If the oil temperature is higher than the oil temperature level 1 warning threshold QT zd1 And the oil level is lower than the first-level warning threshold QH zd1 , it means that the temperature is too high and the oil level is too low. This situation is likely caused by a transformer failure. Therefore, a transformer failure warning signal is generated and sent to the management platform to let the operation and maintenance personnel understand the situation and check and handle the transformer failure in time.

[0027] In this way, the transformer risk status is divided into three levels (level 3 warning, level 2 warning, level 1 warning), and the corresponding warning signals are triggered according to different oil level and oil temperature conditions, so that the operation and maintenance personnel can have a clearer understanding of the risk level of the transformer. This hierarchical warning mechanism helps the operation and maintenance personnel to take targeted measures in a timely manner to reduce the possibility of failure. By comprehensively considering the two key parameters of oil level and oil temperature, the main control organization can more accurately evaluate the operating status of the transformer. This multi-dimensional analysis method helps to reduce false warnings caused by abnormal single parameters and improve the accuracy of warnings.

[0028] Preferably, the main control mechanism is also used to determine the validity of the oil level data obtained by the oil level sensor and the oil temperature data obtained by the oil temperature sensor; if the following formula is satisfied, the oil level data obtained by the oil level sensor and the oil temperature data obtained by the oil temperature sensor are determined to be valid:

[0029] QH min <QH(x)<QH max ;

[0030] QT min <QT(y)<QT max ;

[0031] QT(y)| max -QT(y)| min ≠0;

[0032] In the formula, QH max , QH min The minimum and maximum values ​​of the oil level measured by the oil level sensor; QT min , QT max is the minimum and maximum value that the oil temperature may reach; QT(y)| max , QT(y)| min It is the maximum and minimum value of the measured oil temperature within 24 hours.

[0033] Such a setting can filter out obviously unreasonable or abnormal oil temperature data, thereby improving the accuracy and reliability of the data. Accurate oil temperature data helps operation and maintenance personnel to understand the operating status of the transformer in a timely manner, so as to formulate a more scientific and reasonable maintenance plan. By reducing misjudgments and unnecessary maintenance operations caused by erroneous data, maintenance efficiency can be improved and maintenance costs can be reduced.

[0034] Preferably, when the main control mechanism determines the current oil level, if it receives position sensing signals sent by the two lowest magnetic sensors, the main control mechanism generates a low oil level warning signal and sends it to the management platform.

[0035] With this setting, when the main control mechanism receives the position sensing signal sent by the two magnetic sensors at the bottom, it means that the float has dropped to a very low position, that is, the transformer oil level is very low. The main control mechanism can immediately generate a low oil level warning signal and send it to the management platform. This function enables operation and maintenance personnel to be informed of abnormal oil levels in a timely manner, take corresponding measures, and arrange corresponding inspection plans to avoid failures or damage to the transformer caused by low oil levels.

[0036] Preferably, the main control mechanism includes an alarm unit; it also includes an inspection terminal that communicates with the main control mechanism; when the main control mechanism determines the current oil level, if it only receives a position sensing signal from the lowest magnetic sensor, the main control mechanism sends a timely maintenance signal to the inspection terminal, and at the same time, controls the alarm unit to issue an alarm.

[0037] With this setup, when the main control mechanism receives only the position sensing signal sent by the lowest magnetic sensor, it means that the float has approached the lowest point of the tubular body and the transformer oil level is extremely low. At this time, the main control mechanism can quickly send a timely maintenance signal to the inspection end. This immediate response mechanism ensures that the operation and maintenance personnel can be notified at the first time when the oil level is extremely low, so that they can take quick action to prevent equipment damage or safety accidents caused by too low oil level. At the same time, the control warning unit (such as a warning light) issues a warning, and after the operation and maintenance personnel arrive at the scene, they can quickly lock the transformer with too low oil level through the warning unit.

[0038] Through the communication between the main control unit and the inspection terminal, real-time data transmission and remote monitoring are realized, so that operation and maintenance personnel can understand the oil level status of the transformer at any time and any place, and make corresponding maintenance decisions. This intelligent management method improves the flexibility and convenience of operation and maintenance work and reduces operation and maintenance costs.

[0039] Preferably, the oil temperature sensor is a surface acoustic wave sensor.

[0040] Compared with other types of oil temperature sensors, surface acoustic wave sensors have the advantages of oil resistance and high temperature resistance, and can measure the top layer temperature of transformer oil more stably and accurately.

[0041] Preferably, the spacing between any two adjacent magnetic sensors is equal; when the float moves from the highest position relative to the tubular body to the lowest position, the position height of the magnet passes through the position heights of each magnetic sensor in turn; the magnetic sensor is used to send a position sensing signal to the main control mechanism when the sensed magnetic intensity is greater than a preset magnetic intensity; the preset magnetic intensity is the magnetic intensity sensed by the magnetic sensor when the height difference between the magnetic sensor and the magnet is equal to the spacing between adjacent magnetic sensors; the main control mechanism is used to determine the current oil level based on the magnetic sensor that sends the position signal, and send the oil level determination result to a preset management platform.

[0042] In such a setting, 1. During the lifting and lowering process of the magnet, the position height of the magnet passes through the position height of each magnetic sensor in turn; when the magnetic intensity sensed by the magnetic sensor is greater than the preset magnetic intensity, a position sensing signal will be sent to the main control mechanism. Specifically, the preset magnetic intensity is the magnetic intensity sensed by the magnetic sensor when the height difference between the magnetic sensor and the magnet is equal to the spacing between adjacent magnetic sensors. This is equivalent to, in a specific usage scenario, when the position height of the magnet is between two adjacent magnetic sensors, only these two adjacent magnetic sensors will send a position sensing signal; when the position of the magnet is below the bottom magnetic sensor, only the bottom magnetic sensor will send a position sensing signal; when the position of the magnet is above the top magnetic sensor, only the top magnetic sensor will send a position sensing signal.

[0043] 2. Based on the feedback position sensing signal from the magnetic sensor, it can be determined whether the current position height of the magnet is between two adjacent magnetic sensors, below all magnetic sensors, or above all magnetic sensors. Based on the position height of the magnetic sensor, the current oil level height can be reversely understood. By setting the preset magnetic strength, when the height difference between the magnet and the magnetic sensor is equal to the spacing between adjacent sensors, the magnetic sensor can accurately sense and send a position sensing signal. This design effectively avoids false alarms caused by environmental changes (such as temperature fluctuations) and ensures the accuracy of the monitoring results.

[0044] 3. Through the orderly arrangement of multiple magnetic sensors and the precise setting of preset magnetic strength, the device realizes continuous monitoring of oil level changes. Whether the oil level rises or falls, the current oil level height can be accurately determined by the relative position relationship between the magnet and the magnetic sensor and sent to the remote management platform. The entire monitoring process does not require human intervention, achieving the goal of automated remote monitoring.

[0045] Preferably, the number of magnetic sensors is three.

[0046] Such a setting can effectively save costs on the basis of effectively detecting the oil level.

[0047] Preferably, a magnet bracket is fixedly provided at the free end of the slide rod, and the magnet is fixed on the magnet bracket.

[0048] With this arrangement, the magnet bracket provides a stable support platform for the magnet, ensuring that the magnet can maintain a fixed position and posture when moving with the slide bar, and will not shake or shift due to factors such as oil flow and vibration, thereby improving the accuracy of oil level monitoring. Fixing the magnet with the magnet bracket can simplify the installation process of the magnet, making it more secure and reliable. At the same time, when the magnet needs to be maintained or replaced, it is only necessary to remove the magnet bracket without disassembling the entire slide bar, reducing the difficulty and cost of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to make the purpose, technical solution and advantages of the invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings, in which:

[0050] Figure 1 It is a principle block diagram of the tubular body, the oil level float mechanism, the signal collection mechanism and the main control mechanism in the embodiment;

[0051] Figure 2 Schematic diagram of the structure of the abnormal collaborative diagnosis device for transformer oil level and temperature in the embodiment;

[0052] Figure 3 It is a cross-sectional view of the abnormality cooperative diagnosis device for transformer oil level and temperature in the embodiment except the oil temperature sensor;

[0053] Figure 4 for Figure 3 A partial enlarged view of part A.

[0054] The reference numerals in the drawings of the specification include: a float 1 , a tubular body 2 , a sliding rod 3 , a magnet bracket 4 , a magnet 5 , a first magnetic sensor 6 , a second magnetic sensor 7 , a third magnetic sensor 8 , and an oil temperature sensor 9 . DETAILED DESCRIPTION

[0055] The following is a further detailed description through specific implementation methods:

[0056] Example

[0057] like Figure 1 , Figure 2 As shown, this embodiment discloses a transformer oil level and temperature abnormality collaborative diagnosis device, including a tubular body 2, an oil level buoy mechanism, a signal acquisition mechanism, a main control mechanism, and an inspection terminal communicating with the main control mechanism. In specific implementation, data transmission is performed through RS485.

[0058] like Figure 3 , Figure 4 As shown, the oil level float mechanism includes a float 1 and a slide rod 3; the float 1 can float up and down with the oil level, and the float 1 is fixed to one end of the slide rod 3; the free end of the slide rod 3 is inserted into the tubular body 2 through the bottom of the tubular body 2, the axial direction of the slide rod 3 coincides with the axial direction of the tubular body 2, and the slide rod 3 and the tubular body 2 can slide relative to each other along the axis; a magnet 5 is fixed to the free end of the slide rod 3. In specific implementation, the structure of the tubular body 2, the float 1 and the slide rod 3 can directly use the structure of the existing oil level gauge. Other shapes can also be set as long as they can meet the corresponding functions. This part of the structural content is not the innovation of the present invention and will not be repeated here.

[0059] In a specific implementation, a magnet bracket 4 is fixed to the free end of the slide bar 3, and the magnet 5 is fixed on the magnet bracket 4. In this way, the magnet bracket 4 provides a stable support platform for the magnet 5, ensuring that the magnet 5 can maintain a fixed position and posture when moving with the slide bar 3, and will not shake or shift due to factors such as oil flow and vibration, thereby improving the accuracy of oil level monitoring. Fixing the magnet 5 by the magnet bracket 4 can simplify the installation process of the magnet 5, making it more firm and reliable. At the same time, when the magnet 5 needs to be maintained or replaced, it is only necessary to disassemble the magnet bracket 4 without disassembling the entire slide bar 3, reducing the difficulty and cost of maintenance.

[0060] The signal collection mechanism is fixed inside the tubular body 2; the signal collection mechanism includes a plurality of magnetic sensors arranged along the axial direction of the tubular body 2; and the distances between any two adjacent magnetic sensors are equal.

[0061] When the float 1 moves from the highest position relative to the tubular body 2 to the lowest position, the position height of the magnet 5 passes through the position heights of each magnetic sensor in turn; the magnetic sensor is used to send a position sensing signal to the main control mechanism when the sensed magnetic intensity is greater than the preset magnetic intensity; the preset magnetic intensity is the magnetic intensity sensed by the magnetic sensor when the height difference between the magnetic sensor and the magnet 5 is equal to the spacing between adjacent magnetic sensors.

[0062] In a specific implementation, there are three magnetic sensors, namely, from bottom to top, the first magnetic sensor 6, the second magnetic sensor 7 and the third magnetic sensor 8. If the state in which the magnetic sensor sends a position sensing signal is recorded as state 1, and the state in which the position sensing signal is not sent is recorded as state 0, the relationship between the sensing states of the three magnetic sensors and the oil level state is shown in Table 1:

[0063] Table 1

[0064] First magnetic sensor Second magnetic sensor The third magnetic sensor Oil level status 0 0 1 1 0 1 1 2 0 1 0 3 1 1 0 4 1 0 0 5

[0065] The main control mechanism is used to judge the current oil level according to the magnetic sensor that sends the position signal, and send the oil level judgment result to the preset management platform. The main control mechanism includes a power supply, a processing unit, a communication unit and an alarm unit. In the specific implementation, the processing unit is an MCU (single-chip microcomputer) and the alarm unit is an indicator light. The oil level is analyzed and judged by the MCU, and the oil level judgment result is sent to the management platform through the communication unit. The alarm unit is used to warn of low oil level.

[0066] The float 1 is also provided with an oil temperature sensor 9 for collecting the oil temperature and sending it to the main control mechanism. Oil temperature is one of the important parameters of the transformer's operating status, which directly affects its insulation performance and heat dissipation effect. With such a setting, by integrating the oil temperature sensor 9 on the float 1, the monitoring device can not only monitor the oil level, but also monitor the oil temperature at the same time, thereby realizing comprehensive monitoring of the transformer's operating status and improving the accuracy and completeness of the monitoring. By real-time monitoring of the oil temperature, the operation and maintenance personnel can promptly detect abnormal oil temperature and take corresponding maintenance measures, thereby avoiding equipment damage or performance degradation caused by excessive oil temperature. This helps to improve the reliability and service life of the transformer and reduce operation and maintenance costs.

[0067] In a specific implementation, the oil temperature sensor 9 is a surface acoustic wave sensor. Compared with other types of oil temperature sensors 9, the surface acoustic wave sensor has the advantages of oil resistance and high temperature resistance, and can measure the top temperature of the transformer oil more stably and accurately. In a specific implementation, for the convenience of installation, the float 1 and the slide bar 3 can be set as a hollow structure, and the data line of the oil temperature sensor 9 is connected to the signal acquisition mechanism through the float 1 and the slide bar 3.

[0068] In the specific implementation, the oil temperature information is collected in real time by the oil temperature sensor of the float, and the variable of the collected transformer oil temperature is set as QT(y). At the same time, according to the signal sent by the magnetic sensor, the current oil level state is judged as QH(x).

[0069] The main control mechanism is also used to conduct a comprehensive risk status analysis based on the current oil level and oil temperature. When the main control mechanism conducts a comprehensive risk judgment, the transformer risk status is divided into three levels.

[0070] If QH(x)<QH zd3 , QT(y)<QT zd3 , then a transformer oil leakage warning signal is generated and sent to the management platform;

[0071] Where QT zd3 is the preset normal oil temperature threshold, QH zd3 Check thresholds for preset oil leaks;

[0072] If QH(x)<QH zd2 , QT(y)>QT zd2 , then a transformer aging warning signal is generated and sent to the management platform;

[0073] If QH(x)<QH zd1 , QT(y)>QT zd1 , a transformer fault warning signal is generated and sent to the management platform;

[0074] In the formula, QH zd2 is the preset oil level secondary warning threshold, QH zd1 is the preset oil level first-level warning threshold, and QH zd3 ≥QH zd2 >QH zd1 ;QT zd2 QT is the preset oil temperature secondary warning threshold. zd1 is the preset oil temperature level 1 warning threshold, and QT zd3 ≤QT zd2 <QT zd1 .

[0075] If the oil temperature is lower than the normal oil temperature threshold QT zd3 And the oil level is lower than the oil level replenishment threshold QH zd3 , it means that the oil temperature is normal but the oil volume is insufficient. This situation is likely caused by transformer oil leakage. Therefore, a transformer oil leakage warning signal is generated and sent to the management platform to let the operation and maintenance personnel understand the situation and check the situation in time (such as draining the oil, repairing and refilling the oil).

[0076] If the oil temperature is higher than the oil temperature secondary warning threshold QT zd2 And the oil level is lower than the oil level second warning threshold QHzd2 , it means that the temperature is too high and the oil level is too low. This situation is likely caused by transformer aging. Therefore, a transformer aging warning signal is generated and sent to the management platform to let the operation and maintenance personnel understand the situation and check in time to confirm whether it is transformer aging, so as to solve the problem.

[0077] If the oil temperature is higher than the oil temperature level 1 warning threshold QT zd1 And the oil level is lower than the first-level warning threshold QH zd1 , it means that the temperature is too high and the oil level is too low. This situation is likely caused by a transformer failure. Therefore, a transformer failure warning signal is generated and sent to the management platform to let the operation and maintenance personnel understand the situation and check and handle the transformer failure in time.

[0078] In this way, the transformer risk status is divided into three levels (level 3 warning, level 2 warning, level 1 warning), and the corresponding warning signals are triggered according to different oil level and oil temperature conditions, so that the operation and maintenance personnel can have a clearer understanding of the risk level of the transformer. This hierarchical warning mechanism helps the operation and maintenance personnel to take targeted measures in a timely manner to reduce the possibility of failure. By comprehensively considering the two key parameters of oil level and oil temperature, the main control organization can more accurately evaluate the operating status of the transformer. This multi-dimensional analysis method helps to reduce false warnings caused by abnormal single parameters and improve the accuracy of warnings.

[0079] The main control mechanism is also used to determine the validity of the oil level data obtained by the oil level sensor and the oil temperature data obtained by the oil temperature sensor 9; if the following formula is satisfied, the oil level data obtained by the oil level sensor and the oil temperature data obtained by the oil temperature sensor 9 are determined to be valid:

[0080] QH min <QH(x)<QH max ;

[0081] QT min <QT(y)<QT max ;

[0082] QT(y)| max -QT(y)| min ≠0;

[0083] In the formula, QH max , QH min The minimum and maximum values ​​of the oil level measured by the oil level sensor; QT min , QT max is the minimum and maximum value that the oil temperature may reach; QT(y)| max , QT(y)| min It is the maximum and minimum value of the measured oil temperature within 24 hours.

[0084] In this way, obviously unreasonable or abnormal oil temperature data can be filtered out, thereby improving the accuracy and reliability of the data. Accurate oil temperature data helps operation and maintenance personnel to understand the operating status of the transformer in a timely manner, so as to formulate a more scientific and reasonable maintenance plan. By reducing misjudgments and unnecessary maintenance operations caused by erroneous data, maintenance efficiency can be improved and maintenance costs can be reduced.

[0085] During specific implementation, in order to ensure the installation stability and durability of the main control mechanism, a main control board support frame can be set on the inner wall of the tubular body 2, and then the main control mechanism can be set on the main control board support frame. In this way, the main control board support frame provides a stable installation platform for the main control mechanism, ensuring that the position of the main control mechanism in the tubular body 2 is stable and will not loosen or shift due to factors such as vibration and impact. This helps to improve the overall stability and reliability of the oil level monitoring device. In addition, the design of the main control board support frame can take into account factors such as the weight, size and working environment of the main control mechanism, and select appropriate materials and structures to improve its load-bearing capacity and fatigue resistance. In this way, the main control mechanism is not easily damaged during long-term use, which extends the service life of the entire oil level monitoring device.

[0086] In specific implementation, when the main control mechanism determines the current oil level, if it receives the position sensing signal sent by the two magnetic sensors at the bottom (that is, when the oil level status is 4), the main control mechanism generates a low oil level warning signal and sends it to the management platform. In this way, when the main control mechanism receives the position sensing signal sent by the two magnetic sensors at the bottom, it means that float 1 has dropped to a very low position, that is, the transformer oil level is very low. The main control mechanism can immediately generate a low oil level warning signal and send it to the management platform. This function enables operation and maintenance personnel to be aware of abnormal oil level conditions in a timely manner, take corresponding measures, and arrange corresponding inspection plans to avoid failures or damage to the transformer caused by low oil level.

[0087] When the main control mechanism determines the current oil level, if it only receives a position sensing signal from the lowest magnetic sensor (that is, when the oil level is 5), the main control mechanism sends a timely maintenance signal to the inspection end, and at the same time, controls the warning unit to issue a warning. In this way, when the main control mechanism only receives a position sensing signal from the lowest magnetic sensor, it means that the float 1 has approached the lowest point of the tubular body 2, and the transformer oil level is in an extremely low state. At this time, the main control mechanism can quickly send a timely maintenance signal to the inspection end. This immediate response mechanism ensures that the operation and maintenance personnel can be notified at the first time when the oil level is extremely low, so as to take quick action to prevent equipment damage or safety accidents caused by too low oil level. At the same time, the control warning unit (such as a warning light) issues a warning, and after the operation and maintenance personnel arrive at the scene, they can quickly lock the transformer with too low oil level through the warning unit.

[0088] Through the communication between the main control unit and the inspection end, real-time data transmission and remote monitoring are realized, so that the operation and maintenance personnel can understand the oil level status of the transformer at any time and any place, and make corresponding maintenance decisions. This intelligent management method improves the flexibility and convenience of operation and maintenance work and reduces operation and maintenance costs. In specific implementation, the inspection end can use a smart mobile terminal (such as a smart phone, smart flat panel light) loaded with the corresponding APP, which will not be repeated here.

[0089] Compared with the prior art, when the present device is used and installed, the float 1 will rise and fall synchronously with the rise and fall of the oil level. When the float 1 rises and falls, the magnet bracket 4 and the magnet 5 thereon will also rise and fall synchronously. During the rise and fall of the magnet 5, the position height of the magnet 5 passes through the position height of each magnetic sensor in turn; and when the magnetic intensity sensed by the magnetic sensor is greater than the preset magnetic intensity, a position sensing signal is sent to the main control mechanism. Specifically, the preset magnetic intensity is the magnetic intensity sensed by the magnetic sensor when the height difference between the magnetic sensor and the magnet 5 is equal to the spacing between the adjacent magnetic sensors. It is equivalent to that when the position height of the magnet 5 is between two adjacent magnetic sensors, only these two adjacent magnetic sensors will send a position sensing signal; when the position of the magnet 5 is below the lowest magnetic sensor, only the lowest magnetic sensor will send a position sensing signal; when the position of the magnet 5 is above the highest magnetic sensor, only the highest magnetic sensor will send a position sensing signal. In this way, according to the magnetic sensor that feeds back the position sensing signal, it can be judged whether the current position height of the magnet 5 is between two adjacent magnetic sensors, below all magnetic sensors, or above all magnetic sensors. According to the position height of the magnetic sensor, the current oil level height can be known in reverse.

[0090] In addition, the multiple magnetic sensors arranged along the axial direction of the tubular body 2 in the device can accurately sense the change in magnetic intensity when the magnet 5 passes. By setting the preset magnetic intensity, when the height difference between the magnet 5 and the magnetic sensor is equal to the spacing between adjacent sensors, the magnetic sensor can accurately sense and send a position sensing signal. This design effectively avoids the problem of false alarms caused by environmental changes (such as temperature fluctuations) and ensures the accuracy of the monitoring results. In addition, due to the real-time linkage between the float 1 and the magnet 5, and the rapid response of the magnetic sensor to the change in magnetic intensity, the device can capture this change at the moment when the oil level changes, and immediately process and judge it through the main control mechanism. This real-time monitoring capability enables the operation and maintenance personnel to detect abnormal changes in the oil level in time, so as to take corresponding maintenance measures and avoid potential safety hazards. At the same time, through the orderly arrangement of multiple magnetic sensors and the precise setting of the preset magnetic intensity, the device realizes continuous monitoring of oil level changes. Whether the oil level rises or falls, the current oil level height can be accurately judged by the relative position relationship between the magnet 5 and the magnetic sensor, and sent to the remote management platform. The entire monitoring process does not require human intervention, achieving the goal of automated remote monitoring.

[0091] By using this device, the oil level of the transformer can be monitored efficiently, accurately and in real time, and the oil level can be continuously, accurately and automatically monitored, thereby improving the safety of transformer operation and the maintenance efficiency.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A transformer oil level and temperature abnormality collaborative diagnosis device, characterized in that: It includes a tubular body, an oil level buoy mechanism, a signal collection mechanism and a main control mechanism; the signal collection mechanism communicates with the main control mechanism; The oil level float mechanism includes a float and a slide rod; the float can float up and down with the oil level, and the float is fixed to one end of the slide rod; the free end of the slide rod is inserted into the tubular body through the bottom of the tubular body, and the slide rod and the tubular body can slide relative to each other along the axial direction of the tubular body; a magnet is fixed to the free end of the slide rod; The signal collection mechanism is fixed inside the tubular body; the signal collection mechanism includes a plurality of magnetic sensors arranged along the axial direction of the tubular body; the main control mechanism is used to perform oil level analysis based on the collected data of the plurality of magnetic sensors; The float is also equipped with an oil temperature sensor for collecting the oil temperature and sending it to the main control mechanism; the main control mechanism is also used to conduct a comprehensive risk status analysis based on the current oil level and oil temperature, and perform corresponding processing based on the analysis results.

2. The transformer oil level and temperature abnormality collaborative diagnosis device according to claim 1, characterized in that: When the main control institution makes a comprehensive risk assessment: If QH(x)<QH zd3 , QT(y)<QT zd3 , then a transformer oil leakage warning signal is generated and sent to the management platform; Where QT zd3 is the preset normal oil temperature threshold, QH zd3 is the preset oil leakage check threshold; QH(x) represents the monitored oil level status of the transformer, and QT(y) represents the value of the measured oil temperature of the transformer; If QH(x) <QH zd2 , QT(y)>QT zd2 , then a transformer aging warning signal is generated and sent to the management platform; If QH(x)<QH zd1 , QT(y)>QT zd1 , a transformer fault warning signal is generated and sent to the management platform; In the formula, QH zd2 is the preset oil level secondary warning threshold, QH zd1 is the preset oil level first-level warning threshold, and QH zd3 ≥QH zd2 >QH zd1 ;QT zd2 QT is the preset oil temperature secondary warning threshold. zd1 is the preset oil temperature first-level warning threshold, and QT zd3 ≤QT zd2 <Q Tzd1 .

3. The transformer oil level and temperature abnormality collaborative diagnosis device according to claim 2, characterized in that: The main control mechanism is also used to determine the validity of the oil level data obtained by the oil level sensor and the oil temperature data obtained by the oil temperature sensor; if the following formula is satisfied, the oil level data obtained by the oil level sensor and the oil temperature data obtained by the oil temperature sensor are determined to be valid: QH min <QH(x) <QH max ; QT min <QT(y)<QT max ; QT(y)| max -QT(y)| min ≠0; In the formula, QH max , QH min The minimum and maximum values ​​of the oil level measured by the oil level sensor; QT min , QT max is the minimum and maximum value that the oil temperature may reach; QT(y) max , QT(y) min It is the maximum and minimum value of the measured oil temperature within 24 hours.

4. The transformer oil level and temperature abnormality collaborative diagnosis device according to claim 1, characterized in that: The distance between any two adjacent magnetic sensors is equal; when the float moves from the highest position relative to the tubular body to the lowest position, the position height of the magnet passes through the position height of each magnetic sensor in turn; The magnetic sensor is used to send a position sensing signal to the main control mechanism when the sensed magnetic intensity is greater than the preset magnetic intensity; the preset magnetic intensity is the magnetic intensity sensed by the magnetic sensor when the height difference between the magnetic sensor and the magnet is equal to the spacing between adjacent magnetic sensors; the main control mechanism is used to determine the current oil level based on the magnetic sensor that sends the position signal, and send the oil level determination result to a preset management platform.

5. The transformer oil level and temperature abnormality collaborative diagnosis device according to claim 1, characterized in that: When the main control mechanism determines the current oil level, if it receives the position sensing signals sent by the two lowest magnetic sensors, the main control mechanism generates a low oil level warning signal and sends it to the management platform.

6. The transformer oil level and temperature abnormality collaborative diagnosis device according to claim 4, characterized in that: The main control mechanism includes an alarm unit; it also includes an inspection terminal that communicates with the main control mechanism; when the main control mechanism determines the current oil level, if it only receives a position sensing signal sent by the lowest magnetic sensor, the main control mechanism sends a timely maintenance signal to the inspection terminal, and at the same time, controls the alarm unit to issue an alarm.

7. The transformer oil level and temperature abnormality collaborative diagnosis device according to claim 1, characterized in that: The number of magnetic sensors is 3.

8. The transformer oil level and temperature abnormality collaborative diagnosis device according to claim 1, characterized in that: A magnet bracket is fixedly arranged at the free end of the slide rod, and the magnet is fixed on the magnet bracket.

9. The transformer oil level and temperature abnormality collaborative diagnosis device according to claim 1, characterized in that: The oil temperature sensor is a surface acoustic wave sensor.

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