A transformer with online monitoring function

Abstract

The application provides a transformer with an online monitoring function, and relates to the technical field of transformers.The transformer comprises a box body and vertically arranged inner cores, the inner cores are arranged side by side in the box body, the inner cores are filled with insulating oil, and a heat dissipation assembly for dissipating heat of the insulating oil is arranged outside the box body.A sampling cylinder in a vertical state and extending into the insulating oil is arranged on the box body, the sampling cylinder has an inner cavity, a sampling inlet in communication with the inner cavity is formed in the side wall of the sampling cylinder, a detection piece is arranged at the upper end of the sampling cylinder, the detection piece is used for detecting the insulating oil entering the inner cavity from the sampling inlet and displaying a temperature value, a driving part is further arranged on the box body, the driving part is used for driving the sampling inlet to move along the axial direction of the sampling cylinder, so that the insulating oil at different heights can enter the inner cavity of the sampling cylinder from the sampling inlet, the temperature of the insulating oil at different heights is detected, the monitoring range is improved, and the oil temperature anomaly can be found in time, and problems can be checked in time.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to a transformer with online monitoring function. Background Technology

[0002] In power systems, transformers, as core equipment for power conversion and transmission, directly affect the safety and efficiency of the entire power grid through their reliability and stability. Oil-immersed transformers, with their excellent insulation performance, heat dissipation capacity, and high reliability, occupy an important position in power transmission and distribution networks. The typical structure of this type of transformer mainly consists of key components such as the core, windings, insulating medium (insulating oil), oil tank, cooling device, oil conservator, bushings, and protection devices (such as gas relays and pressure relief valves). Among these, the core and windings constitute the core of electromagnetic conversion, immersed in an oil tank filled with insulating oil. The insulating oil has insulation and heat dissipation functions, dissipating the heat generated during operation through natural convection or forced circulation using radiators, cooling fans, or even oil pumps.

[0003] To ensure the long-term safe and stable operation of oil-immersed transformers, it is crucial to promptly detect potential hazards such as insulation degradation, overheating faults, or mechanical defects. Therefore, real-time monitoring and assessment of the transformer's operating status, especially the temperature of its internal insulating oil, are necessary. Existing insulating oil temperature monitoring devices are typically installed at specific locations on the top or side of the insulating oil tank. While they can measure the temperature of the top layer, their monitoring range is limited and they cannot monitor the temperature of the insulating oil at different locations, making it difficult to promptly detect abnormal oil temperatures and troubleshoot problems.

[0004] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] Therefore, it is necessary to provide a transformer with online monitoring function to address the problems existing in current oil-immersed transformers.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A transformer with online monitoring function includes a tank and vertically arranged inner cores. Multiple inner cores are arranged side by side inside the tank and are surrounded by insulating oil. A heat dissipation component is provided outside the tank for dissipating heat from the insulating oil. A sampling cylinder is provided on the tank in a vertical position and extends into the insulating oil. The sampling cylinder has an inner cavity, and an inlet is formed on the side wall of the sampling cylinder that communicates with the inner cavity. A detection element is provided at the upper end of the sampling cylinder for detecting the temperature value of the insulating oil entering the inner cavity from the sampling inlet. A driving unit is also provided on the tank for driving the sampling inlet to move axially along the sampling cylinder.

[0008] Furthermore, multiple sampling tubes are evenly distributed along the circumference of the inner core.

[0009] Furthermore, the sampling tube includes an inner tube and an outer tube that are coaxially nested. The outer wall of the inner tube is fitted with the inner wall of the outer tube, and an inner cavity is formed inside the inner tube. A first side groove is formed on the side wall of the inner tube. The first side groove is spiral and its axis coincides with the axis of the inner tube. The outer tube is fixed to the box body. A second side groove is formed on the side wall of the outer tube. The second side groove is straight and parallel to the axis of the outer tube. The first side groove and the second side groove have an overlapping area to form a sample inlet. The driving unit is used to drive the inner tube to rotate relative to the outer tube so that the sample inlet moves along the axial direction of the sampling tube.

[0010] Furthermore, an auger coaxial with the inner cylinder is provided inside the inner cylinder, and the drive unit is also used to drive the auger to rotate so as to transport the insulating oil in the inner cavity to the testing component.

[0011] Furthermore, the auger, inner cylinder, and outer cylinder are all made of heat-insulating material.

[0012] Furthermore, the inner cylinder rotates at a lower speed than the auger.

[0013] Furthermore, the enclosure is equipped with a partition cylinder, which is fitted outside the inner core, and insulating oil is filled between the inner core and the partition cylinder.

[0014] Furthermore, the inner core includes a coaxial iron core, a low-voltage coil, and a high-voltage coil arranged sequentially from the inside to the outside. Both the low-voltage coil and the high-voltage coil have gaps, which allow insulating oil to flow and exchange between the inner and outer sides of the low-voltage coil and the inner and outer sides of the high-voltage coil. Intermediate components are provided between the iron core and the low-voltage coil, between the low-voltage coil and the high-voltage coil, and between the high-voltage coil and the partition. The intermediate components include a cylindrical frame and multiple spiral-shaped guide vanes. The frame has multiple evenly distributed accommodating areas in its circumference, and the guide vanes are located within the accommodating areas. The multiple guide vanes are arranged sequentially along the spiral trajectory.

[0015] Furthermore, in two adjacent guide vanes on the same spiral trajectory, the outer side of one guide vane is higher than its inner side, and the outer side of the other guide vane is lower than its inner side.

[0016] Furthermore, in the two adjacent intermediate components, the number of accommodating areas is equal and corresponds one-to-one, and the number of guide vanes is equal and corresponds one-to-one.

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

[0018] (1) The drive unit drives the inlet to move along the axial direction of the sampling cylinder, so that insulating oil of different heights can enter the inner cavity of the sampling cylinder from the inlet, so as to detect the temperature of insulating oil of different heights, improve the monitoring range, and thus be able to detect abnormal oil temperature and troubleshoot problems in a timely manner.

[0019] (2) The auger, inner cylinder and outer cylinder are all made of heat insulation material, which reduces the heat transfer between the insulating oil and the auger, inner cylinder and outer cylinder to a certain extent, so that the insulating oil entering the test piece is kept at the temperature when it is sampled, and the accuracy of temperature value detection is guaranteed.

[0020] (3) The insulating oil rises when heated and flows along the guide plate to generate a rotating circulation effect. At the same time, due to the different heights inside and outside the guide plate, the guide plate will guide the insulating oil inward or outward during the flow of the insulating oil. This allows the insulating oil to flow inward and outward alternately on the same spiral trajectory, and pass through the gaps to the low-voltage coil or high-voltage coil, so that the insulating oil can fully contact the low-voltage coil or high-voltage coil, thereby improving the heat absorption capacity and heat dissipation efficiency of the low-voltage coil and high-voltage coil. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a transformer with online monitoring function provided in an embodiment of the present invention;

[0022] Figure 2 for Figure 1 A partial top view;

[0023] Figure 3 for Figure 1 Schematic diagram of the internal structure of the middle box;

[0024] Figure 4 for Figure 3 Schematic diagram of the sampling tube;

[0025] Figure 5 for Figure 4 A partial sectional view;

[0026] Figure 6 for Figure 4 Exploded view of the parts;

[0027] Figure 7 for Figure 6 A magnified view of a section at point A in the middle;

[0028] Figure 8 for Figure 6 A magnified view of a section at point B in the middle;

[0029] Figure 9 This is a schematic diagram of the assembly of the three intermediate components;

[0030] Figure 10 for Figure 9 Top view;

[0031] Figure 11 for Figure 10 CC-direction sectional view;

[0032] Figure 12 This is a structural diagram of an intermediate component.

[0033] in:

[0034] 101. Housing; 102. Inner core; 103. Bushing; 104. Oil conservator; 105. Oil return pipe; 106. Heat sink; 107. Iron core; 108. Low-voltage coil; 109. High-voltage coil;

[0035] 201. Sampling cylinder; 202. Detection piece; 203. Inner cylinder; 204. Outer cylinder; 205. First side groove; 206. Second side groove; 207. Screwdriver; 208. Outer box; 209. Inner box; 210. Side hole; 211. Motor; 212. Planetary carrier; 213. Sun gear; 214. Planetary gear; 215. Gear ring; 216. Partition cylinder; 217. Frame; 218. Guide vane; 219. Ring body; 220. Support rod. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0037] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] like Figures 1 to 12 As shown, this embodiment of the invention provides a transformer (hereinafter referred to as the transformer) with online monitoring function, including a housing 101 and vertically arranged inner cores 102. Multiple inner cores 102 are arranged side by side inside the housing 101. The inner cores 102 are surrounded by insulating oil. A heat dissipation component for dissipating heat from the insulating oil is provided outside the housing 101. A sampling cylinder 201 is provided on the housing 101 in a vertical position and extends into the insulating oil. The sampling cylinder 201 has an inner cavity. An inlet communicating with the inner cavity is formed on the side wall of the sampling cylinder 201. A detection element 202 is provided at the upper end of the sampling cylinder 201. The detection element 202 is used to detect the insulating oil entering the inner cavity from the inlet and display the temperature value. A driving part is also provided on the housing 101. The driving part is used to drive the inlet to move along the axial direction of the sampling cylinder 201.

[0040] The drive unit drives the sampling port to move axially along the sampling cylinder 201, so that insulating oil at different heights can enter the inner cavity of the sampling cylinder 201 from the sampling port, so as to detect the temperature of insulating oil at different heights, improve the monitoring range, and thus be able to detect abnormal oil temperature in time and troubleshoot problems in a timely manner.

[0041] The housing 101 also includes structures such as bushings 103 and oil conservators 104. Bushings 103 are divided into low-voltage and high-voltage types, used to safely connect the internal core 102 leads to the external circuit, while ensuring reliable insulation between the high-voltage conductor and the grounded housing 101. The oil conservator 104 is used to compensate for the volume expansion and contraction of the insulating oil due to temperature changes. The detection element 202 includes a temperature sensor and a display. The temperature sensor is used to detect the temperature of the insulating oil, and the temperature value is displayed on the display, which is located outside the housing 101. Of course, the temperature sensor of the detection element 202 can also be connected to a processor, controller, and alarm device. When the temperature value is higher than a preset value, the processor and controller control the alarm device to generate an alarm signal for real-time monitoring of the oil temperature. The structure and working principle of the oil-immersed transformer, the detection element 202, and the alarm device described above are all existing technologies and will not be elaborated here.

[0042] In one embodiment, see Figure 3Multiple sampling cylinders 201 are evenly distributed along the circumference of the inner core 102, which can detect the temperature of insulating oil at different positions along the circumference of the inner core 102, further improving the monitoring range, so as to detect abnormal oil temperature in time and troubleshoot problems in a timely manner.

[0043] In one embodiment, see Figures 4 to 8 The sampling cylinder 201 includes an inner cylinder 203 and an outer cylinder 204 nested coaxially. The outer wall of the inner cylinder 203 is fitted with the inner wall of the outer cylinder 204, and an inner cavity is formed inside the inner cylinder 203. A first side groove 205 is formed on the side wall of the inner cylinder 203. The first side groove 205 is spiral and its axis coincides with the axis of the inner cylinder 203. The outer cylinder 204 is fixed to the housing 101. A second side groove 206 is formed on the side wall of the outer cylinder 204. The second side groove 206 is straight and parallel to the axis of the outer cylinder 204. The first side groove 205 and the second side groove 206 have an overlapping area to form a sample inlet. The driving unit is used to drive the inner cylinder 203 to rotate relative to the outer cylinder 204 so that the sample inlet moves along the axial direction of the sampling cylinder 201.

[0044] Furthermore, the outer wall of the inner cylinder 203 and the inner wall of the outer cylinder 204 are precisely fitted with a clearance, and the viscosity of the insulating oil forms a liquid seal, which is sufficient to ensure that most of the flow comes from the inlet, thus meeting the engineering monitoring requirements.

[0045] The drive unit drives the inner cylinder 203 to rotate relative to the outer cylinder 204, causing the overlapping area of ​​the first side groove 205 and the second side groove 206 to move along the axial direction of the sampling cylinder 201, thereby causing the inlet to move along the axial direction of the sampling cylinder 201.

[0046] The first side groove 205 extends through the inner wall of the inner cylinder 203, and the second side groove 206 extends through the outer wall of the outer cylinder 204, allowing insulating oil to enter the inner cavity through the inlet formed by the second side groove 206 and the first side groove 205. The lower end of the inner cylinder 203 is open, and the lower end of the outer cylinder 204 is sealed. Preferably, the width and height of the first side groove 205 and the second side groove 206 are equal. The helical trajectory of the first side groove 205 has a larger pitch, and the number of helical turns of the first side groove 205 is less than one turn.

[0047] In one embodiment, the inner cylinder 203 is provided with an auger 207 coaxial with it, and the driving unit is also used to drive the auger 207 to rotate so as to transport the insulating oil in the inner cavity to the detection element 202.

[0048] The outer cylinder 204 has a cylindrical outer box 208 coaxially fixed to its upper end. The outer box 208 is fixed outside the housing 101, and the working end of the detection element 202 extends into the outer box 208. The inner cylinder 203 extends into the outer box 208 and is coaxially fixed to a cylindrical inner box 209. The portion of the inner cylinder 203 extending into the outer box 208 has a side hole 210, allowing the inner cavity to communicate with the interior of the outer box 208. The insulating oil in the inner cavity can enter the interior of the outer box 208 through the side hole 210 and be measured by the detection element 202. The drive unit includes a motor 211 and a transmission mechanism. The motor 211 is equipped with a corresponding power supply and controller to control the start-stop and operating conditions. The motor 211 is fixed to the outer box 208, and the output end of the motor 211 extends into the inner cavity and is equipped with an auger 207. At the same time, the output end of the motor 211 drives the inner cylinder 203 to rotate relative to the outer cylinder 204 through the transmission structure. In addition, the outer box 208 has a cover at the top to facilitate the disassembly and assembly of the motor 211 and the transmission mechanism. It is worth noting that the outer side of the auger 207 contacts the inner wall of the inner cylinder 203, and the thickness, number of spiral turns, and pitch of the auger 207 can be selected and set as needed, without any restrictions here.

[0049] In addition, the upper end of the detection element 202 is provided with an oil port, which is connected to a pipeline (not shown). The end of the pipeline extends to below the liquid level of the insulating oil inside the housing 101. The amount of insulating oil entering the outer box 208 gradually increases and enters the detection element 202 for temperature measurement. After passing through the detection element 202, the insulating oil continues to flow back along the pipeline and merges with the insulating oil inside the housing 101.

[0050] In this embodiment, the auger 207 transports the insulating oil from bottom to top, improving the timeliness and efficiency of detection. In other embodiments not shown, the auger 207 may be omitted, but the inner cylinder 203 and outer cylinder 204 must be made of thermally conductive material. The insulating oil will rise due to its decreased density after being heated, generating natural convection, thus simplifying the structure. However, in this case, the temperature of the insulating oil measured by the detection element 202 will be too high, and a value needs to be subtracted from the measured temperature value to obtain the actual temperature value.

[0051] In one embodiment, the auger 207, inner cylinder 203, and outer cylinder 204 are all made of heat-insulating material, which reduces the heat transfer between the insulating oil and the auger 207, inner cylinder 203, and outer cylinder 204 to a certain extent, so that the insulating oil entering the detection element 202 is kept at the temperature when it was sampled, ensuring the accuracy of the temperature value detection.

[0052] All components that the insulating oil comes into contact with before being tested by component 202 are made of heat-insulating material. Examples include the outer box 208, the inner box 209, and the transmission structure.

[0053] In one embodiment, the inner cylinder 203 rotates at a lower speed than the auger 207.

[0054] The inner cylinder 203 rotates at a lower speed to allow sufficient time for insulating oil at different heights to enter the inner cavity from the inlet; the auger 207 rotates at a higher speed to quickly deliver the insulating oil entering the inner cavity to the detection element 202, ensuring the accuracy of temperature detection.

[0055] The transmission mechanism includes a planetary carrier 212, a sun gear 213, planetary gears 214, and a ring gear 215. The planetary carrier 212 is fixed to the outer casing 208. The sun gear 213 is fixed to the output end of the motor 211. Multiple planetary gears 214 are evenly distributed along the circumference of the sun gear 213 on the planetary carrier 212. The inner casing 209 has an opening at its upper end and is equipped with a ring gear 215. The inner sides of the planetary gears 214 mesh with the sun gear 213, and the outer sides mesh with the ring gear 215. The output end of the motor 211 drives the sun gear 213 and the auger 207 to rotate rapidly, and drives the inner casing 209 and the inner cylinder 203 to rotate at low speed through the planetary gears 214 and the ring gear 215. Preferably, the motor 211 and the transmission mechanism can be located outside the outer casing 208 to avoid affecting the operation of the transmission mechanism.

[0056] In one embodiment, see Figure 2 The housing 101 is equipped with a partition cylinder 216, which is sleeved on the outside of the inner core 102. Insulating oil is filled between the inner core 102 and the partition cylinder 216, so that the insulating oil is closer to the heat source formed by the inner core 102. While reducing the amount of insulating oil used, it can ensure the heat absorption capacity and heat dissipation efficiency of the insulating oil to the inner core 102.

[0057] Among them, see Figure 1 The heat dissipation assembly includes an oil return pipe 105 and a heat sink 106. The inner side of the oil return pipe 105 is connected to the inside of the partition cylinder 216, and the outer side of the oil return pipe 105 is connected to the inside of the heat sink 106, so as to realize the circulation and heat dissipation of the insulating oil.

[0058] In one embodiment, see Figure 2 as well as Figures 9 to 12 The inner core 102 includes a coaxial iron core 107, a low-voltage coil 108, and a high-voltage coil 109 arranged sequentially from the inside to the outside. Both the low-voltage coil 108 and the high-voltage coil 109 have gaps, which allow insulating oil to flow and exchange between the inner and outer sides of the low-voltage coil 108 and the high-voltage coil 109. Intermediate components are provided between the iron core 107 and the low-voltage coil 108, between the low-voltage coil 108 and the high-voltage coil 109, and between the high-voltage coil 109 and the partition cylinder 216. The intermediate components include a cylindrical frame 217 and multiple spiral guide vanes 218. The frame 217 has multiple evenly distributed accommodating areas in its circumference, and the guide vanes 218 are located within the accommodating areas. The multiple guide vanes 218 are arranged sequentially along a spiral trajectory.

[0059] The insulating oil rises when heated and flows along the guide plate 218 to generate a rotating circulation effect, so that the insulating oil can fully contact the low-voltage coil 108 or the high-voltage coil 109, thereby improving the heat absorption capacity and heat dissipation efficiency of the low-voltage coil 108 and the high-voltage coil 109.

[0060] The iron core 107 may have an upper yoke at its upper end and a lower yoke at its lower end, and be bound together with straps. All iron cores 107 have conductive support structures on both sides. All intermediate components are made of insulating material. For an intermediate component, its frame 217 includes two rings 219 arranged vertically opposite each other and multiple support rods 220 vertically arranged between the two rings 219. The multiple support rods 220 are evenly distributed along the circumference of the rings 219, and adjacent support rods 220 form accommodating areas, with each accommodating area having an equal central angle. At a certain point along the circumference of the ring 219, two support rods 220 are arranged at intervals along the radial direction of the ring 219. The outer side of the guide plate 218 is fixed to the outer support rod 220, and the inner side of the guide plate 218 is fixed to the inner support rod 220. Therefore, when the insulating oil flows along the guide plate 218, it can flow from the gap between the two support rods 220 to the adjacent guide plate 218, thereby generating a continuous guiding and circulating effect on the insulating oil.

[0061] Preferably, an intermediate component has multiple flow guiding components, each of which includes multiple flow guiding plates 218 arranged sequentially along a spiral trajectory. The multiple flow guiding components are evenly distributed along the circumference of the frame 217, so that the area where the flow guiding plates 218 generate flow guiding and circulation effects is more dense, thereby improving the flow guiding and circulation effects on the insulating oil.

[0062] Furthermore, for the outermost intermediate assembly between the high-voltage coil 109 and the spacer 216, both rings 219 have through holes to facilitate the installation of the outer cylinder 204 on the rings 219, thereby enabling temperature detection of the insulating oil near the inner core 102. The outer cylinder 204 is inserted into the gap between the two support rods 220, and the second side groove 206 is tangential to the ring 219, so that the insulating oil circulating in the rotation can enter the inner cavity from the second side groove 206 and the first side groove 205.

[0063] In one embodiment, among two adjacent guide vanes 218 on the same spiral trajectory, the outer side of one guide vane 218 is higher than its inner side, and the outer side of the other guide vane 218 is lower than its inner side.

[0064] Because the inner and outer heights of the guide plate 218 are different, as the insulating oil flows along the guide plate 218, the guide plate 218 will guide the insulating oil inward or outward, so that the insulating oil flows inward and outward alternately on the same spiral trajectory, and passes through the gaps into the low-voltage coil 108 or the high-voltage coil 109, so that the insulating oil can fully contact the low-voltage coil 108 or the high-voltage coil 109, further improving the heat absorption capacity and heat dissipation efficiency of the coil.

[0065] In each flow guiding assembly, the inner sides of two adjacent flow guiding blades 218 are fixed and smoothly transitioned; in other words, the inner side of the flow guiding assembly is a continuous spiral shape. It can be understood that each flow guiding assembly can be formed from a spiral blade. Specifically, the spiral blade is cut at equal intervals, from the outside to the inside, without completely cutting it off, to form multiple sequentially arranged flow guiding blades 218. The outer side of the first flow guiding blade 218 is bent upwards, making its outer side higher than its inner side; the outer side of the second flow guiding blade 218 is bent downwards, making its outer side lower than its inner side, and so on, so that adjacent flow guiding blades 218 respectively generate inward and outward flow tendencies for the insulating oil.

[0066] Optionally, Figure 11 This is a cross-sectional view of the three intermediate components from the outside to the inside. For the guide vane 218 that is cut on the left, it is inclined from the upper left to the lower right, that is, the outer side is higher than the inner side. From top to bottom, the cross-sectional surfaces of the first guide vane 218, the second guide vane 218, and the third guide vane 218 are collinear, so that the insulating oil can flow from the third guide vane 218 to the second guide vane 218, and then to the first guide vane 218. Similarly, for the guide vanes 218 that are cut on the right side, they are all inclined from the upper left to the lower right, that is, the outer side is lower than the inner side. From top to bottom, the cut surfaces of the first guide vane 218 in the inner layer, the second guide vane 218 in the middle layer, and the third guide vane 218 in the outer layer are collinear, so that the insulating oil can flow from the third guide vane 218 in the outer layer to the second guide vane 218 in the middle layer, and then to the first guide vane 218 in the inner layer. This allows the insulating oil between the three intermediate components to exchange, so that the insulating oil can fully contact the low-voltage coil 108 or the high-voltage coil 109, further improving the heat absorption capacity and heat dissipation efficiency of the coil.

[0067] In one embodiment, the number of accommodating regions in two adjacent intermediate components are equal and correspond one-to-one, and the number of guide vanes 218 are equal and correspond one-to-one.

[0068] The working principle of this invention is as follows:

[0069] When the transformer is working, the low-voltage coil 108 and the high-voltage coil 109 generate heat. This heat is dissipated through the insulating oil in the partition 216 and the heat dissipation components. Simultaneously, intermediate components are provided between the core 107 and the low-voltage coil 108, between the low-voltage coil 108 and the high-voltage coil 109, and between the high-voltage coil 109 and the partition 216. The heated insulating oil rises and flows along the guide vanes 218, creating a rotating circulation effect. Due to the different heights inside and outside the guide vanes 218, the vanes guide the insulating oil inwards or outwards, causing the oil to alternately flow inwards and outwards along the same spiral trajectory. The oil then passes through gaps into the low-voltage coil 108 or the high-voltage coil 109, ensuring sufficient contact between the insulating oil and the coils, thus improving the heat absorption capacity and heat dissipation efficiency of the low-voltage coil 108 and the high-voltage coil 109.

[0070] The output of motor 211 drives the sun gear 213 to rotate, which in turn drives the inner box 209 and inner cylinder 203 to rotate via planetary gears 214 and gear ring 215. This causes the inner cylinder 203 to rotate relative to the outer cylinder 204, moving the overlapping area of ​​the first side groove 205 and the second side groove 206 along the axial direction of the sampling cylinder 201. This allows the inlet to move along the axial direction of the sampling cylinder 201, enabling insulating oil of different heights to enter the inner cavity of the sampling cylinder 201 through the inlet. Simultaneously, the output of motor 211 drives the auger 207 to rotate, transporting the insulating oil in the inner cavity to the detection element 202 for temperature detection of insulating oil at different heights. At the same time, multiple sampling cylinders 201 detect the temperature of insulating oil at different positions around the inner core 102, increasing the monitoring range and enabling timely detection of abnormal oil temperatures and timely troubleshooting.

[0071] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A transformer with online monitoring function, characterized in that, The device includes a housing and vertically arranged inner cores, multiple of which are arranged side-by-side inside the housing and surrounded by insulating oil. A heat dissipation assembly is provided outside the housing to dissipate heat from the insulating oil. A vertically positioned sampling cylinder extending into the insulating oil is located on the housing. The sampling cylinder has an inner cavity, and an inlet communicating with the inner cavity is formed on its side wall. A detection element is located at the upper end of the sampling cylinder, used to detect and display the temperature value of the insulating oil entering the inner cavity through the inlet. A drive unit is also provided on the housing to drive the inlet to move axially along the sampling cylinder. The sampling cylinder includes an inner cylinder and an outer cylinder nested coaxially. The outer wall of the inner cylinder is fitted with the inner wall of the outer cylinder, and an inner cavity is formed inside the inner cylinder. A first side groove is formed on the side wall of the inner cylinder. The first side groove is spiral and its axis coincides with the axis of the inner cylinder. The outer cylinder is fixed to the housing. A second side groove is formed on the side wall of the outer cylinder. The second side groove is straight and parallel to the axis of the outer cylinder. The first side groove and the second side groove have an overlapping area to form a sample inlet. A drive unit is used to drive the inner cylinder to rotate relative to the outer cylinder so that the sample inlet moves along the axial direction of the sampling cylinder. An auger is provided inside the inner cylinder and is coaxial with it. The drive unit is also used to drive the auger to rotate so as to transport the insulating oil in the inner cavity to the detection element.

2. The transformer with online monitoring function according to claim 1, characterized in that, Multiple sampling cylinders are evenly distributed along the circumference of the inner core.

3. The transformer with online monitoring function according to claim 1, characterized in that, The auger, inner cylinder, and outer cylinder are all made of heat-insulating material.

4. The transformer with online monitoring function according to claim 1, characterized in that, The inner cylinder rotates at a lower speed than the auger.

5. The transformer with online monitoring function according to claim 1, characterized in that, The enclosure is equipped with a partition cylinder, which is fitted outside the inner core, and insulating oil is filled between the inner core and the partition cylinder.

6. The transformer with online monitoring function according to claim 5, characterized in that, The inner core includes a coaxial iron core, a low-voltage coil, and a high-voltage coil arranged sequentially from the inside to the outside. Both the low-voltage coil and the high-voltage coil have gaps, which allow insulating oil to flow and exchange between the inner and outer sides of the low-voltage coil and the inner and outer sides of the high-voltage coil. Intermediate components are provided between the iron core and the low-voltage coil, between the low-voltage coil and the high-voltage coil, and between the high-voltage coil and the partition. The intermediate components include a cylindrical frame and multiple spiral guide vanes. The frame has multiple evenly distributed accommodating areas in its circumference. The guide vanes are located in the accommodating areas, and the multiple guide vanes are arranged sequentially along the spiral trajectory.

7. The transformer with online monitoring function according to claim 6, characterized in that, In two adjacent guide vanes on the same spiral trajectory, the outer side of one guide vane is higher than its inner side, and the outer side of the other guide vane is lower than its inner side.

8. The transformer with online monitoring function according to claim 6, characterized in that, In two adjacent intermediate components, the number of accommodating areas is equal and corresponds one-to-one, and the number of guide vanes is equal and corresponds one-to-one.

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