A coil device leakage oil detection method and device

Abstract

The application discloses a coil device oil leakage detection method and device, and relates to the technical field of oil leakage detection. The method comprises the following steps: taking a picture of the oil level and oil temperature of a coil device through a monitoring device, and recording the oil level and oil temperature as reference values; regularly taking an image of the coil device; judging the oil volume and temperature change according to the image of the coil device, determining a normal oil level range, and issuing a warning when the normal range is exceeded; if the oil level exceeds the normal range, collecting at least three times to confirm the abnormality; after the confirmation, taking the abnormal oil level and oil temperature as the reference, and retesting, and if the abnormality occurs again, the coil device is determined to have an oil leakage fault; the method can timely inform the oil leakage risk of the device and accurately diagnose the risk, and has good application effects in terms of timeliness and accuracy. The method fully solves the problems of untimely manual inspection and subjective misjudgment in defect discovery.

Description

Technical Field

[0001] This invention relates to the field of oil leakage detection technology, specifically to a method and apparatus for detecting oil leakage in coil-type equipment. Background Technology

[0002] Coil-type equipment is a crucial component of power systems, primarily including oil-immersed transformers, current transformers, and voltage transformers. These devices contain conductive coils, which are insulated from and cooled by oil filling. With continuous advancements in power technology, electrical faults such as short circuits, overloads, and open circuits can be quickly and accurately detected and handled promptly by microprocessor-based protection systems. However, non-electrical faults in coil-type equipment, such as oil leaks, remain a significant challenge that needs to be addressed.

[0003] During operation, coil-type equipment may develop various defects, which can be categorized into general defects, serious defects, and critical defects. General defects are within the permissible range and have little impact on safe operation; serious defects exceed operating standards and pose a significant threat to personnel or equipment, and may lead to accidents if not addressed promptly; critical defects directly threaten safe operation and require immediate attention, otherwise they may cause serious consequences such as equipment damage, personal injury, large-scale power outages, and fires.

[0004] Currently, monitoring oil leaks in coil-type equipment mainly relies on regular inspections by maintenance personnel and on-site oil leak detection devices. During inspections, maintenance personnel use tools such as telescopes and infrared thermometers to manually observe the oil level and connections of the equipment and determine if there are any leaks. However, manual inspections are time-consuming, inefficient, and prone to subjective misjudgments, especially when the equipment is high up or the oil level indicator is high, making leaks difficult to detect in a timely manner. Furthermore, a single oil level observation cannot be compared with previous readings, further increasing the difficulty of leak detection.

[0005] Installing oil leak detection devices is another solution, but such devices require multiple detection front-ends on each device, and each device must be connected to the main unit via twisted-pair cables for data transmission and power supply. Given the large number of oil-filled devices in substations, and the proximity of many to live components, installing detection devices is not only inconvenient but also costly. Furthermore, most devices are located outdoors, while the monitoring main unit is typically indoors, necessitating extensive wiring both indoors and outdoors. This not only complicates construction but also hinders maintenance in case of malfunctions. Therefore, existing detection devices are primarily suitable for detecting critical equipment and are difficult to widely adopt across all coil-type equipment. Summary of the Invention

[0006] The purpose of this invention is to provide a method and device for detecting oil leakage in coil-type equipment, transformer bodies, and bushings. This method can promptly inform users of the risk of oil leakage and accurately diagnose the risk, demonstrating excellent application results in terms of timeliness and accuracy. It effectively solves the problems of untimely manual inspections and subjective misjudgments in defect detection.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a method for detecting oil leakage in coil-type equipment, comprising... Step 1, Initial Sampling: Take pictures of the oil level and oil temperature of the coil-type equipment using monitoring equipment, and record the oil level and oil temperature as reference values; Step 2, Regular Monitoring: Regularly capture images of coil-type devices; Step 3, Diagnosis: Based on the images of coil-type equipment, determine the changes in oil volume and temperature, identify the normal oil level range, and issue an early warning when the level exceeds the normal range; Step 4, Anomaly Confirmation: If the oil level is outside the normal range, perform at least three data collections to confirm the anomaly. Step 5, oil leak determination: After confirming the anomaly, retest the oil level and temperature after the anomaly. If the anomaly reappears, it is determined to be an oil leak fault.

[0008] In step one, the monitoring equipment takes pictures every 6 hours, with at least four sets of pictures.

[0009] In step five, the diagnosis in step three is performed multiple times according to the collection cycle, with a retest cycle of no less than one week; if the oil level is abnormal again in the retest results, it is determined to be an oil leakage fault.

[0010] When detecting oil leakage in transformer bushings, the difference between the reference oil level of the transformer body and the oil volume in the transformer bushings is less than the volume of oil in the bushings that decreases due to temperature changes. The reference transformer bushing oil level is used to measure the difference between the oil volume in the reference transformer bushing and the actual transformer bushing oil volume. The height of the reference transformer bushing oil level from the caliper to the bottom of the oil cap is assumed to be... The height of the transformer bushing oil volume from the bottom of the oil cap using calipers. ; Determine the volume change difference of oil level position : Reference transformer bushing oil level and the difference between the actual transformer bushing oil level and the actual site:

[0011] Reference transformer bushing oil level and volume difference between the reference transformer bushing and the on-site transformer bushing:

[0012] Difference in volume change of transformer oil with temperature : Reference transformer bushing oil temperature and the temperature difference between the reference transformer bushing oil and the actual transformer bushing oil:

[0013] Reference transformer bushing oil total volume:

[0014] Reference transformer bushing and the volume difference of oil temperature change in the on-site transformer bushing:

[0015] Normal range of transformer bushing oil level changes: If the value exceeds the specified range, the transformer bushing is considered to be leaking oil.

[0016] When detecting oil leakage in the transformer body, the difference between the reference value of the oil level in the transformer body and the current oil volume in the transformer body is less than the reduction in oil volume caused by temperature changes. Determine the volume change difference of oil level position Determine whether the oil level is in the upper or lower semicircle of the oil reservoir, and handle accordingly. Among them, the difference in volume change of transformer oil with temperature : Reference transformer body oil temperature difference and on-site transformer body oil temperature difference:

[0017] Reference transformer body oil total volume:

[0018] Reference transformer body and on-site transformer body oil temperature change volume difference: .

[0019] When both the reference transformer oil level and the field transformer oil level are in the upper half of the oil conservator,

[0020] Reference the oil-free volume of the upper half of the transformer body's oil conservator:

[0021]

[0022] Oil-free volume of the upper half of the transformer body oil conservator on site:

[0023]

[0024] Difference in volume change at oil level: .

[0025] When the reference transformer oil level is in the upper half of the oil conservator, and the on-site transformer oil level is in the lower half of the oil conservator,

[0026] Reference the oil-free volume of the upper half of the transformer body's oil conservator:

[0027] Oil-free volume of the upper half of the transformer body oil conservator on site:

[0028]

[0029]

[0030] Difference in volume change at oil level: .

[0031] When both the reference transformer oil level and the field transformer oil level are in the lower half of the oil conservator

[0032] The lower half of the oil conservator in the transformer body contains oil volume:

[0033]

[0034] There is oil volume in the lower half of the transformer body oil conservator on site:

[0035]

[0036] Difference in volume change at oil level: .

[0037] A device for detecting oil leakage in coil-type equipment includes a monitoring device and a terminal host. The monitoring device is used to collect and monitor the oil level and oil temperature of the coil-type equipment. The terminal host is connected to the monitoring device and processes the oil level and oil temperature collected by the monitoring device and compares them with preset values. When the oil level and oil temperature exceed the range, the terminal host issues an early warning.

[0038] Compared with existing technologies, the beneficial effects of this invention are as follows: Based on the characteristic that oil volume increases or decreases with temperature, this invention calculates the volume change of oil at a reference oil level and the actual oil level at their respective temperatures. Using this as a reference benchmark, it determines whether the calculated oil level of the coil equipment conforms to normal changes. If it is lower than normal, an oil leakage risk warning is issued, ensuring timely alerts to potential oil leakage risks. After the warning, multiple auxiliary verification steps, such as oil level anomaly confirmation and equipment oil leakage determination, are used to repeatedly verify the indicated risk, ensuring accurate diagnosis of equipment oil leakage faults.

[0039] The above method can promptly inform users of equipment oil leakage risks and accurately diagnose those risks, demonstrating excellent performance in both timeliness and accuracy. It effectively solves the problems of untimely manual inspections and subjective misjudgments in defect detection.

[0040] The monitoring device used in this invention can be shared with the existing monitoring camera equipment in the substation. The terminal host can diagnose oil leakage faults by intelligently analyzing the image information. Moreover, if the monitoring equipment is properly installed, one set of monitoring equipment can collect oil level and temperature information from multiple coil devices without the need to install front-end devices on the tested equipment or to carry out complex network wiring. Not only is the construction simple and feasible, but its cost is also far lower than that of installing an oil leakage device. The more devices there are, the more obvious the cost advantage becomes. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the device connection structure of the present invention; Figure 2 This is a schematic diagram of the process of the present invention.

[0042] Figure 3 This is a schematic diagram of the transformer body structure of the present invention. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] refer to Figure 1 As shown, the oil leakage detection device for coil-type equipment includes a monitoring device and a terminal host. The monitoring device is used to collect and monitor the oil level and oil temperature of the coil-type equipment. The terminal host is connected to the monitoring device and processes the oil level and oil temperature collected by the monitoring device and compares them with preset values. When the oil level and oil temperature exceed the range, the terminal host issues an early warning. The monitoring device consists of a high-definition visible light camera and an infrared camera. The high-definition visible light camera can capture clear visible light images for recording and observing information such as the appearance and oil level of the equipment. It can operate under normal lighting conditions and provide high-definition images.

[0045] Infrared cameras can sense and record the infrared radiation emitted by objects, primarily used to detect temperature changes. They can operate in low-light or complete darkness, helping to identify the thermal state of equipment or detect abnormal temperatures.

[0046] The method for detecting oil leakage in coil-type equipment includes the following steps: (1) Initial oil level sampling: After the coil equipment is newly put into operation or has undergone oil-filling related maintenance, the coil equipment is photographed using monitoring equipment (one photograph every 6 hours, at least four sets of photographs). Under the condition that the oil level in the photograph is directly proportional to the transformer temperature and there is no significant difference, the oil level and temperature in the photograph are used as reference oil level and oil temperature. At the same time, the oil filling dimensions of each component of the coil equipment (e.g., the oil filling volume inside the transformer body, oil conservator, bushing ceramic column and oil cap) can be collected according to the instruction manual and on-site acceptance information.

[0047] (2) Periodic oil level photography: During the initial sampling period, visible light and infrared photos of the coil equipment are taken periodically as the analysis object of the monitoring process.

[0048] (3) Intelligent oil level diagnosis process: By using the correlation algorithm between the oil volume and temperature change pattern in the coil equipment and the oil level change volume at the oil gauge position, the normal range of oil level change is determined. For cases exceeding the range, a diagnostic warning is issued based on the percentage of excess. Taking transformer oil conservator as an example: Transformers, as oil-filled devices, are divided into multiple independent oil chambers. For example, the oil in the transformer body and bushing components is not interconnected. The following will describe the transformer body and bushings in detail. To clearly illustrate this structure, the following will be provided: Figure 3 The color diagram shows the transformer body in blue, the oil level indicator in yellow, and the oil level position indicated by the red horizontal line. Orange and gray represent the ceramic part of the bushing and the oil cap, respectively; the yellow part on the oil cap is the oil level indicator, and the red horizontal line indicates the oil level position.

[0049] Oil level judgment analysis: The main difference between oil level judgment in the transformer body and bushing lies in the shape and location of the oil level indicator. The oil conservator in the transformer body is a horizontally placed cylinder, while the oil cap in the bushing is a vertically placed cylinder. 1) Transformer bushing oil level analysis method: The difference between the oil volume at the reference oil level and the current oil volume should not be greater than the volume of oil in the bushing that has shrunk due to temperature changes.

[0050] The volume difference between the oil level in the reference photograph and the actual oil level is mainly determined by the caliper height of the casing cap. Let the height of the caliper from the bottom of the cap in the reference oil level photograph be... The height of the calipers from the bottom of the oil cap in the on-site photos Therefore, the analysis method is as follows: Determine the volume change difference of oil level position : Difference between reference oil level and actual oil level

[0051] Difference in volume between reference oil level and actual oil level:

[0052] Difference in volume change of transformer oil with temperature : Temperature difference between reference oil and on-site oil:

[0053] The total volume of the casing oil is shown in the reference image.

[0054] The volume difference between reference and on-site oil temperature change:

[0055] in This represents the rate of volume change of transformer oil with temperature. Different oils exhibit different rates of change. Taking the commonly used No. 25 transformer oil as an example, tests have shown that for a 1-degree Celsius increase or decrease in oil temperature, its volume will either increase or decrease.

[0056] Normal range of transformer bushing oil level changes: If the oil level exceeds the above range, the casing is considered to be at risk of oil leakage, and The more you exceed the limit, the higher the risk of oil leakage.

[0057] 2) Transformer body oil level analysis method: The difference between the oil volume at the reference oil level and the current oil volume should not be greater than the volume of oil in the bushing that has shrunk due to temperature changes.

[0058] In the above embodiments, the method for determining transformer body oil leakage is consistent with the principle for bushing leakage; the only difference is... The calculation.

[0059] Determine the volume change difference of oil level position First, determine whether the oil level is in the upper or lower half of the oil reservoir. Scenario 1: Both the reference oil level and the actual oil level are in the upper half of the oil tank.

[0060] Reference photo: Oil-free volume of the upper half of the oil pillow.

[0061]

[0062] On-site photos show the volume of the upper part of the oil-free section of the oil-filled pillow:

[0063]

[0064] The volume change difference at the oil level position in the first case:

[0065] The second scenario: the reference oil level is in the upper half of the oil tank, while the actual oil level is in the lower half of the oil tank.

[0066]

[0067] Reference photo: Oil-free volume of the upper half of the oil pillow.

[0068]

[0069] On-site photos show the volume of the upper part of the oil-free section of the oil-filled pillow:

[0070]

[0071] The volume change difference at the oil level position in the second scenario:

[0072] The third scenario: Both the reference oil level and the actual oil level are located in the lower half of the oil conservator.

[0073] The lower half of the oil reservoir in the reference photo shows the oil volume:

[0074]

[0075] Photos from the scene show oil volume in the lower half of the oil reservoir.

[0076]

[0077] The volume change difference at the oil level position in the third case:

[0078] Difference in volume change of transformer oil with temperature : Temperature difference between reference oil and on-site oil:

[0079] The total volume of the casing oil is shown in the reference image.

[0080] The volume difference between reference and on-site oil temperature change:

[0081] in This represents the rate of volume change of transformer oil with temperature. Different oils exhibit different rates of change. Taking the commonly used No. 25 transformer oil as an example, tests have shown that for a 1-degree Celsius increase or decrease in oil temperature, its volume will either increase or decrease.

[0082] Normal range of oil level changes in transformer body: If the leakage exceeds the above range, it is considered that the transformer body is at risk of oil leakage, and The more you exceed the limit, the higher the risk of oil leakage.

[0083] (4) Oil level abnormality confirmation process: Since coil-type equipment is large in size, the internal heat is mainly generated by the current passing through the coil. The oil temperature inside the equipment is not necessarily uniform. In the diagnosis process, false alarms may occur due to the oil temperature acquisition error. Therefore, after the oil level change exceeds the normal range in the diagnosis process, in addition to issuing an early warning, at least three more data collections should be carried out according to the data collection time period (four times in 24 hours, as a reference oil level after the abnormality). If all the diagnoses are found to be outside the normal range, the oil level change abnormality is preliminarily determined.

[0084] (5) Equipment oil leakage judgment process: When the oil level is confirmed to be abnormal, the oil level and temperature collected 24 hours after the abnormality are used as reference values, and multiple (3) intelligent oil level diagnosis process is carried out according to the collection cycle. Considering that the oil loss due to leakage is relatively large, the number of retests can be set by the technicians according to the size of the equipment. In principle, the retest cycle should not be less than one week. If the oil level is abnormal again in the retest results, it is judged as an oil leakage fault.

[0085] This invention utilizes the characteristic that oil volume increases or decreases with temperature. It calculates the volume change of oil at a reference level and the actual oil level at their respective temperatures, using this as a benchmark to determine whether the calculated oil level of the coil equipment conforms to normal changes. If it is lower than normal, an oil leakage risk warning is issued to ensure timely alerts of potential oil leakage risks. After the warning, multiple auxiliary verification steps, such as oil level anomaly confirmation and equipment oil leakage determination, are used to repeatedly verify the risk, ensuring accurate diagnosis of equipment oil leakage faults.

[0086] The above method can promptly inform users of equipment oil leakage risks and accurately diagnose those risks, demonstrating excellent performance in both timeliness and accuracy. It effectively solves the problems of untimely manual inspections and subjective misjudgments in defect detection.

[0087] The monitoring device used in this invention can be shared with the existing monitoring camera equipment in the substation. The terminal host can diagnose oil leakage faults by intelligently analyzing the image information. Moreover, if the monitoring equipment is properly installed, one set of monitoring equipment can collect oil level and temperature information from multiple coil devices without the need to install front-end devices on the tested equipment or to carry out complex network wiring. Not only is the construction simple and feasible, but its cost is also far lower than that of installing an oil leakage device. The more devices there are, the more obvious the cost advantage becomes.

[0088] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0089] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for detecting oil leakage in coil-type equipment, characterized in that, include Step 1, Initial Sampling: Take pictures of the oil level and oil temperature of the coil-type equipment using monitoring equipment, and record the oil level and oil temperature as reference values; Step 2, Regular Monitoring: Regularly capture images of coil-type devices; Step 3: Determine the normal oil level range and issue a warning when the level exceeds the normal range; Step 4, Anomaly Confirmation: If the oil level is outside the normal range, perform at least three data collections to confirm the anomaly. Step 5, oil leak determination: After confirming the anomaly, retest the oil level and temperature after the anomaly. If the anomaly reappears, it is determined to be an oil leak fault.

2. The method for detecting oil leakage in coil-type equipment according to claim 1, characterized in that, In step one, the monitoring equipment takes pictures every 6 hours, with at least four sets of pictures.

3. The method for detecting oil leakage in coil-type equipment according to claim 1, characterized in that, In step two, the changes in oil volume and temperature are determined based on the images of coil-type equipment to determine the normal oil level range.

4. The method for detecting oil leakage in coil-type equipment according to claim 1, characterized in that, In step five, the diagnosis in step three is performed multiple times according to the collection cycle, with a retest cycle of no less than one week; if the oil level is abnormal again in the retest results, it is determined to be an oil leakage fault.

5. The method for detecting oil leakage in coil-type equipment according to any one of claims 1-4, characterized in that, When detecting oil leakage in transformer bushings, the difference between the reference oil level in the transformer bushing and the actual oil volume in the transformer bushing is less than the volume of oil in the bushing that decreases due to temperature changes. The reference transformer bushing oil level is used to measure the difference between the oil volume in the reference transformer bushing and the actual transformer bushing oil volume. The height of the reference transformer bushing oil level from the caliper to the bottom of the oil cap is assumed to be... The height of the transformer bushing oil volume from the bottom of the oil cap using calipers. ; Determine the volume change difference of oil level position : Reference transformer bushing oil level and the difference between the actual transformer bushing oil level and the actual site: Reference transformer bushing oil level and volume difference between the reference transformer bushing and the on-site transformer bushing: Difference in volume change of transformer oil with temperature : Reference transformer bushing oil temperature and the temperature difference between the reference transformer bushing oil and the actual transformer bushing oil: Reference transformer bushing oil total volume: Reference transformer bushing and the volume difference of oil temperature change in the on-site transformer bushing: Normal range of transformer bushing oil level changes: If the value exceeds the specified range, the transformer bushing is considered to be leaking oil.

6. The method for detecting oil leakage in coil-type equipment according to any one of claims 1-4, characterized in that, When detecting oil leakage in the transformer body, the difference between the reference value of the oil level in the transformer body and the current oil volume in the transformer body is less than the reduction in oil volume caused by temperature changes. Determine the volume change difference of oil level position Determine whether the oil level is in the upper or lower semicircle of the oil reservoir, and handle accordingly. Among them, the difference in volume change of transformer oil with temperature : Reference transformer body oil temperature difference and on-site transformer body oil temperature difference: Reference transformer body oil total volume: Reference transformer body and on-site transformer body oil temperature change volume difference: .

7. The method for detecting oil leakage in coil-type equipment according to claim 6, characterized in that, When both the reference transformer oil level and the field transformer oil level are in the upper half of the oil conservator, Reference the oil-free volume of the upper half of the transformer body's oil conservator: Oil-free volume of the upper half of the transformer body oil conservator on site: Difference in volume change at oil level: .

8. The method for detecting oil leakage in coil-type equipment according to claim 6, characterized in that, When the reference transformer oil level is in the upper half of the oil conservator, and the on-site transformer oil level is in the lower half of the oil conservator, Reference the oil-free volume of the upper half of the transformer body's oil conservator: Oil-free volume of the upper half of the transformer body oil conservator on site: Difference in volume change at oil level: .

9. The method for detecting oil leakage in coil-type equipment according to claim 6, characterized in that, When both the reference transformer oil level and the field transformer oil level are in the lower half of the oil conservator The lower half of the oil conservator in the transformer body contains oil volume: There is oil volume in the lower half of the transformer body oil conservator on site: Difference in volume change at oil level: .

10. A device for detecting oil leakage in coil-type equipment according to any one of claims 1-4, characterized in that, It includes a monitoring device and a terminal host. The monitoring device is used to collect the oil level and oil temperature of the monitoring coil-type equipment. The terminal host is connected to the monitoring device and processes the oil level and oil temperature of the monitoring coil-type equipment collected by the monitoring device and compares them with preset values. When the oil level and oil temperature exceed the range, the terminal host issues an early warning.

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