Converter transformer on-line monitoring device

Abstract

The application discloses a converter transformer on-line monitoring device, which comprises a fixed-point sampler and a monitoring host arranged on one side of the converter transformer. The fixed-point sampler is composed of an outer protective sleeve rod penetratingly arranged on an upper sealing plate of the converter transformer, a fixed-point isolation component for separating transformer oils of different layers and an inner sampling tube slidingly arranged in the outer protective sleeve rod. A depth adjusting portion is arranged on the top of the fixed-point sampler. The fixed-point sampler can collect oil samples of different oil layers, realizes fixed-point detection and multi-point detection, and is more accurate in detection. When collecting, the inner sampling tube will not collide with the devices inside the converter transformer. The fixed-point isolation component can not only separate the oil samples of other layers, but also improve the flowability of the transformer oil inside the converter transformer by moving when not sampling, which is beneficial to improving the heat dissipation effect. The power system can simultaneously control the depth adjusting portion and the heat dissipation portion, and can also control the heat dissipation portion alone, which is high in flexibility, saves energy, and is more environmentally friendly.

Description

Technical Field

[0001] This invention relates to the technical field of transformer monitoring equipment, specifically to an online monitoring device for converter transformers. Background Technology

[0002] The characteristic gases of early transformer faults are carbon monoxide and hydrogen in the oil. These are mainly produced by the aging and decomposition of organic insulating materials and insulating oil inside the transformer as the transformer operates for longer periods and under the long-term effects of heat and electricity. Other gases produced along with them include carbon dioxide and hydrocarbon gases, most of which are dissolved in the transformer oil.

[0003] Therefore, the working principle of common online transformer monitoring devices is that the characteristic gas in the transformer oil selectively enters the gas detector through the permeation membrane inside the sensor, which is directly connected to the transformer body. It then reacts chemically with the fuel cell inside the sensor and oxygen in the air to generate an output electrical signal proportional to the reaction rate. After rectification and amplification, the output electrical signal and temperature compensation electrical signal are displayed on the device's screen as a volume fraction value to the technicians. By monitoring whether the displayed value deviates from the baseline rate, the device can predict whether the transformer will have an early-stage fault.

[0004] However, in actual use, due to the poor fluidity of transformer oil, which is not conducive to heat dissipation, and the fact that the sensors directly connected to the transformer body are usually fixed at a certain height, only the characteristic gas in the oil layer where it is located can enter the gas detector. As a result, the characteristic gas content in other oil layers cannot be detected. This leads to the problem that the characteristic gas content data collected by the transformer online monitoring device is not accurate enough, which is not conducive to the detection of early faults and cannot achieve multi-point monitoring. If the number of sensors is increased, multiple holes will be opened on the transformer to install the sensors, which will increase the difficulty of ensuring the transformer's sealing. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an online monitoring device for converter transformers.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] The present invention relates to an online monitoring device for converter transformers, comprising a fixed-point sampler and a monitoring host disposed on one side of the converter transformer. The fixed-point sampler consists of an outer protective sleeve rod that penetrates the upper sealing plate of the converter transformer, a fixed-point isolation component that separates different layers of transformer oil, and an inner sampling tube that is slidably disposed within the outer protective sleeve rod. The lower part of the inner sampling tube has a set of sampling ports, and the outer protective sleeve rod has multiple sets of fixed-point sampling holes arranged radially. The top of the fixed-point sampler is provided with a depth adjustment part, which includes an elongated oval adjustment plate for installing the inner sampling tube and an adjustment rope disposed on the top of the elongated oval adjustment plate. The adjustment rope is limited and supported by a limiting bracket.

[0008] The depth adjustment section is provided with heat dissipation sections on both the left and right sides to accelerate heat dissipation. The front and rear sides are respectively provided with a conveying system and a power system for conveying transformer oil. The conveying system consists of an upper conduit, a lower conduit, and multiple collection bottles located between the upper and lower conduits. The liquid inlet end of the upper conduit is connected to the liquid outlet of the inner sampling tube through a hose. The power system drives the depth adjustment section and the heat dissipation section and consists of a power rod and a transmission gear set. The power rod includes a winding sleeve rod and a power rod 1 located inside the winding sleeve rod. The adjustment rope is wound around the winding sleeve rod.

[0009] As a preferred embodiment of the present invention, the power rod further includes a second power rod and two rotating sleeve rods. The inner wall of the rotating sleeve rod is symmetrically provided with a second locking groove. The outer wall of the second power rod is fixed with a second locking strip that matches the second locking groove. One rotating sleeve rod is sleeved on the outside of the second power rod through the second locking strip and the second locking groove. The outer wall of the first power rod is fixed with a first locking strip and a third locking strip. The other rotating sleeve rod is sleeved on one end of the first power rod through the cooperation of the third locking strip and the second locking groove. The transmission gear set consists of a first bevel gear and a second bevel gear sleeved and fixed on the rotating sleeve rod. The second bevel gear meshes with the first bevel gear.

[0010] As a preferred embodiment of the present invention, the winding sleeve has a switching chamber inside. One end of the switching chamber is connected to two snap-fit ​​grooves that match the snap-fit ​​strip. Both ends of the winding sleeve are provided with support plates. The winding sleeve passes through the support plates and is rotatably connected to the support plates through bearings. The support plates are fixed to the top of the support bridge. The support bridge is fixed to the top of the converter transformer's upper sealing plate by bolts. The power system also includes a telescopic rod and a dual-axis motor. The telescopic rod is fixed to the top of the support bridge's bottom plate. Its piston rod passes through a through-hole on the side plate of the support bridge and is connected to a C-shaped moving bracket. The dual-axis motor is fixed to the top of the C-shaped moving bracket. The two output ends of the dual-axis motor are respectively fixedly connected to the other ends of power rod one and power rod two.

[0011] As a preferred embodiment of the present invention, a sliding rod is fixed on one side of the support bridge, and two L-shaped upright plates fixed to the top of the converter transformer upper sealing plate are provided on the outer side of the support bridge. The L-shaped upright plates are used to support the rotating sleeve rod. One end of the rotating sleeve rod is rotatably connected to the L-shaped upright plate through a bearing, and the U-shaped movable bracket is slidably connected to the sliding rod through a sliding groove at its bottom.

[0012] As a preferred embodiment of the present invention, the depth adjustment unit further includes two limiting brackets and a support rod fixed to the top of the upper sealing plate of the converter transformer. A support shaft is rotatably provided on the upper part between the two support rods. Two guide wheels for tensioning the adjustment rope are sleeved and fixed on the outer wall of the support shaft. The adjustment rope is wound around the outside of the winding sleeve rod through the guide wheels. A dividing block for separating the two adjustment ropes is sleeved in the middle of the winding sleeve rod. The two limiting brackets are located on the front and rear sides of the elongated oval adjustment plate and are arranged facing each other. A limiting groove is provided on the limiting bracket.

[0013] As a preferred embodiment of the present invention, one end of the adjusting rope is provided with a mounting screw that can pass through a through hole in the elongated oval adjusting plate. The mounting screw is fixedly connected to the elongated oval adjusting plate by a mounting nut, and both sides of the elongated oval adjusting plate are symmetrically provided with sliding blocks that slide in cooperation with the limiting groove.

[0014] As a preferred embodiment of the present invention, the heat dissipation part consists of a driven rod and a mounting bracket fixed to the top of the upper sealing plate of the converter transformer. One end of the driven rod is rotatably connected to the mounting bracket through a bearing, and a plurality of fan-shaped fan blades arranged in a linear array are sleeved and fixed on its outer wall. The bevel gear is sleeved and fixed to the other end of the driven rod.

[0015] As a preferred embodiment of the present invention, the fixed-point isolation assembly consists of a sealing piston and an arc-shaped isolation strip fixed to the top of the sealing piston and in contact with the outer wall of the inner sampling tube. The sealing piston is slidably disposed inside the outer protective sleeve rod, and a toothed engagement groove is provided on its top. The arc-shaped isolation strip is also in contact with the inner wall of the outer protective sleeve rod to seal the fixed-point sampling hole. L-shaped through-holes are provided at both ends of the arc-shaped isolation strip. A set of oil extraction holes communicating with the sampling port is also provided at the lower end of the arc-shaped isolation strip. A limiting block with its bottom in contact with the top of the arc-shaped isolation strip is fixed to the upper part of the inner sampling tube, and a toothed engagement joint that engages with the toothed engagement groove is fixed to the lower end. Two L-shaped engagement strips that engage with the L-shaped through-holes are also fixed to its outer wall.

[0016] As a preferred embodiment of the present invention, the limiting bracket includes a mounting plate bolted to one side of the limiting stand and an arc-shaped inclined brace supporting the adjusting rope. One side of the mounting plate is provided with two connecting rods welded to the back of the arc-shaped inclined brace.

[0017] As a preferred embodiment of the present invention, the monitoring host is internally equipped with a controller, a gas detector electrically connected to the controller, and an oil-gas separator. The outlet of the oil-gas separator is connected to the inlet of the gas detector via a pipe. The conveying system further includes a circulating pump, a three-way solenoid valve one installed at the outlet of the circulating pump, and a three-way solenoid valve two installed at the inlet of the circulating pump. The other two ends of the three-way solenoid valve one are connected to the lower conduit and the transformer oil circulation port of the converter transformer via pipes, respectively. The other two ends of the three-way solenoid valve two are connected to the oil inlet and outlet of the oil-gas separator via pipes, respectively. The upper and lower ends of the collection bottle are connected to the upper conduit and the lower conduit via solenoid valves, respectively. The lower part of the collection bottle is tapered to reduce transformer oil residue.

[0018] The beneficial effects of this invention are:

[0019] 1. This online monitoring device for converter transformers adjusts the sampling point by adjusting the height of the inner sampling tube. Since multiple sets of fixed-point sampling holes on the outer protective sleeve divide the transformer oil inside the converter transformer into multiple oil layers, the inner sampling tube, by changing its position, can collect transformer oil samples from different oil layers. This enables both fixed-point and multi-point detection, improving the accuracy of the detection results. Furthermore, the inner sampling tube moves within the outer protective sleeve without colliding with the internal components of the converter transformer. Combined with the fixed-point isolation component that moves with the inner sampling tube, it can separate oil samples from other layers. When the fixed-point isolation component moves downwards, it can also squeeze out transformer oil that has entered the outer protective sleeve. Therefore, when not sampling, the fixed-point isolation component, which moves up and down within the outer protective sleeve with the inner sampling tube, can improve the fluidity of the transformer oil inside the converter transformer, thus improving heat dissipation.

[0020] 2. This type of online monitoring device for converter transformers uses the extension and retraction of the piston rod of the telescopic rod to move the C-shaped moving bracket, which in turn drives the dual-axis motor. The dual-axis motor then moves the first power rod, causing the first locking strip on the first power rod to fully insert into or disengage from the first locking slot. When the first locking strip is inserted into the first locking slot, the first power rod rotates the winding sleeve rod, thereby controlling the winding and unwinding of the adjustment rope and adjusting the height of the internal sampling tube. When the first locking strip disengages from the first locking slot, the winding sleeve rod stops rotating, while the first power rod continues to rotate. During this process, as long as the dual-axis motor continues to operate, the first and second power rods can engage with the first bevel gear, causing the driven rod to drive the fan-shaped fan blades to rotate above the converter transformer, thus accelerating the dissipation of heat from the heat sink fins. This allows the heat sink to operate independently or simultaneously with the depth adjustment unit, offering high flexibility. Furthermore, it uses the same power system, resulting in a simple structure, energy savings, and greater environmental friendliness.

[0021] 3. In this type of converter transformer online monitoring device, the L-shaped locking strip is inserted into the L-shaped through-hole, and then the fixed-point isolation component is moved from bottom to top, so that the arc-shaped isolation strip moves along the outer wall of the inner sampling tube until the arc-shaped isolation strip moves to the top and is blocked by the limiting block. The sealing piston is also fixed at the bottom of the inner sampling tube by the locking connection between the toothed locking groove and the toothed locking connector. The arc-shaped isolation strip and the sealing piston do not need to be installed separately, and the cooperation between the L-shaped locking strip and the L-shaped through-hole plays a positioning role. The toothed locking groove and the toothed locking connector automatically align, thereby achieving the purpose of rapid installation.

[0022] 4. This type of online monitoring device for converter transformers utilizes the threaded connection of the mounting screw and mounting nut, allowing operators to easily install the adjusting rope onto the elongated oval adjusting plate. Compared to using a lifting ring and hook connection, the adjusting rope is less prone to swaying. The sliding block and the limit groove slide in cooperation, along with the two adjusting ropes, further help maintain the balance of the elongated oval adjusting plate, which can further reduce the swaying of the elongated oval adjusting plate and thus improve the stability of the inner sampling tube. This effectively avoids the problem of damage caused by the inner sampling tube colliding with the outer protective sleeve rod when it moves.

[0023] 5. In this type of converter transformer online monitoring device, the adjusting rope is guided by the guide wheel and wound around the winding sleeve rod. This not only tensions the adjusting rope but also guides it to improve its directionality during winding and unwinding. Combined with the arc-shaped inclined support of the limit bracket to support and limit the adjusting rope, it can effectively avoid the probability of swaying during winding and unwinding, thus helping to avoid the problem of two adjusting ropes intertwining. Finally, the use of a separator block to separate the two adjusting ropes can further prevent them from getting tangled together.

[0024] 6. This online monitoring device for converter transformers connects the collection bottle to the internal sampling tube by switching the solenoid valve on the collection bottle, starting the circulation pump and switching between three-way solenoid valve one and three-way solenoid valve two to connect the collection bottle to the oil-gas separator. The collected transformer oil is then sent to the oil-gas separator for oil-gas separation. The circulation pump is then started and three-way solenoid valve one and three-way solenoid valve two are switched to pump the separated gaseous transformer oil into the converter transformer, realizing the circulation of transformer oil. This reduces the waste of transformer oil. Furthermore, the device is equipped with multiple collection bottles, allowing for the temporary storage of transformer oil from different oil layers that do not have time to enter the oil-gas separator. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 This is a front structural schematic diagram of the online monitoring device for converter transformers of the present invention;

[0027] Figure 2 This is a schematic diagram of the rear structure of the online monitoring device for converter transformers of the present invention;

[0028] Figure 3 This is a first-view schematic diagram of the distribution structure of the fixed-point sampler, conveying system, power system and heat dissipation unit of the online monitoring device for converter transformers of the present invention;

[0029] Figure 4 This is a schematic diagram of the second-view distribution structure of the fixed-point sampler, conveying system, power system and heat dissipation unit of the online monitoring device for converter transformers of the present invention;

[0030] Figure 5 This is an exploded view of the depth adjustment section of the online monitoring device for converter transformers of the present invention;

[0031] Figure 6 This is a schematic diagram of the limiting bracket structure of the online monitoring device for converter transformers of the present invention;

[0032] Figure 7 This is a schematic diagram of the power system structure of the online monitoring device for converter transformers of the present invention;

[0033] Figure 8 This is a schematic diagram of the connection structure between the rotating sleeve and the power rod of the online monitoring device for converter transformers of the present invention;

[0034] Figure 9 This is a three-dimensional sectional view of the winding sleeve of the online monitoring device for converter transformers of the present invention;

[0035] Figure 10 This is a schematic diagram of the power rod structure of the online monitoring device for converter transformers of the present invention;

[0036] Figure 11 This is a schematic diagram of the installation of the fixed-point sampler and the elongated oval adjustment plate in the online monitoring device for converter transformers of the present invention;

[0037] Figure 12 This is a schematic diagram of the structure of the internal sampling tube of the online monitoring device for converter transformers of the present invention extending from the outer protective sleeve rod;

[0038] Figure 13 This is a schematic diagram of the fixed-point isolation component of the converter transformer online monitoring device of the present invention being disconnected from the inner sampling tube.

[0039] In the diagram: 001, converter transformer;

[0040] 1. Fixed-point sampler; 11. Outer protective sleeve; 111. Fixed-point sampling hole; 12. Arc-shaped isolation strip; 121. Oil sampling hole; 122. L-shaped through-hole; 13. Limiting block; 14. Inner sampling tube; 141. Gear tooth snap-fit ​​connector; 142. L-shaped snap-fit ​​strip; 15. Sealing piston; 151. Gear tooth snap-fit ​​groove; 16. Hoses;

[0041] 2. Monitoring host;

[0042] 3. Conveying system; 31. Collection bottle; 32. Solenoid valve; 33. Upper conduit; 34. Lower conduit; 35. Three-way solenoid valve II; 36. Three-way solenoid valve I; 37. Circulation pump;

[0043] 4. Heat dissipation unit; 41. Driven rod; 42. Fan-shaped fan blade; 43. Mounting bracket;

[0044] 5. Limiting bracket; 51. Arc-shaped diagonal brace; 52. Connecting rod; 53. Mounting plate;

[0045] 6. Depth adjustment section; 61. Adjustment rope; 611. Mounting screw; 62. Support shaft; 63. Guide wheel; 64. Limiting frame; 641. Limiting slide groove; 65. Elongated oval adjusting plate; 651. Sliding block; 66. Supporting diagonal rod; 67. Mounting nut;

[0046] 7. Supporting cable tray; 71. Through opening; 72. Slide rod; 73. Supporting upright plate;

[0047] 8. Power system; 81. Telescopic rod; 82. Dual-axis motor; 83. Bevel gear one; 84. Bevel gear two; 85. Divider block; 86. L-shaped upright plate; 87. C-shaped moving bracket; 88. Power rod; 881. Winding sleeve rod; 8811. Switching compartment; 8812. Snap-fit ​​groove one; 882. Power rod one; 8821. Snap-fit ​​strip one; 8822. Snap-fit ​​strip three; 883. Rotating sleeve rod; 8831. Snap-fit ​​through groove two; 884. Power rod two; 8841. Snap-fit ​​strip two. Detailed Implementation

[0048] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0049] Example: Figure 1-13As shown, the online monitoring device for converter transformers of the present invention includes a fixed-point sampler 1 and a monitoring host 2 located on one side of the converter transformer 001. The fixed-point sampler 1 consists of an outer protective sleeve rod 11 that penetrates the sealing plate of the converter transformer 001, a fixed-point isolation component that separates different layers of transformer oil, and an inner sampling tube 14 that is slidably located inside the outer protective sleeve rod 11. A set of sampling ports is opened at the lower part of the inner sampling tube 14, and multiple sets of fixed-point sampling holes 111 are opened radially on the outer protective sleeve rod 11. The top of the fixed-point sampler 1 is provided with a depth adjustment part 6. The depth adjustment part 6 includes an elongated oval adjustment plate 65 for installing the inner sampling tube 14 and an adjustment rope 61 located at the top of the elongated oval adjustment plate 65. The adjustment rope 61 is limited and supported by a limiting bracket 5.

[0050] The depth adjustment section 6 is provided with heat dissipation sections 4 on both the left and right sides to accelerate heat dissipation. The front and rear sides are respectively provided with a conveying system 3 and a power system 8 for conveying transformer oil. The conveying system 3 consists of an upper conduit 33, a lower conduit 34 and a plurality of collection bottles 31 located between the upper conduit 33 and the lower conduit 34. The liquid inlet end of the upper conduit 33 is connected to the liquid outlet of the inner sampling tube 14 through a hose 16. The power system 8 drives the depth adjustment section 6 and the heat dissipation section 4 and is composed of a power rod 88 and a transmission gear set. The power rod 88 includes a winding sleeve rod 881 and a power rod 882 located inside the winding sleeve rod 881. The adjusting rope 61 is wound around the winding sleeve rod 881.

[0051] The power rod 88 further includes a second power rod 884 and two rotating sleeve rods 883. The inner wall of each rotating sleeve rod 883 has symmetrically formed locking grooves 8831. The outer wall of the second power rod 884 is fixed with locking strips 8841 that match the locking grooves 8831. One rotating sleeve rod 883 is fitted onto the outside of the second power rod 884 via the locking strips 8841 and the locking grooves 8831. The outer wall of the first power rod 882 is fixed with locking strips 8821 and 8822. The other rotating sleeve rod... 883 is fitted onto one end of the power rod 882 through the engagement of the locking strip 8822 and the locking slot 8831. The transmission gear set consists of a bevel gear 83 and a bevel gear 84 fitted and fixed on the rotating sleeve 883. The bevel gear 84 meshes with the bevel gear 83. The dual-shaft motor 82 moves the power rod 882. When the locking strip 8821 on the power rod 882 is fully inserted into the locking slot 8812, the bevel gear 84 meshes with the bevel gear 83, causing the driven rod 41 to rotate. At the same time, the power rod 882... The winding sleeve 881 rotates to retract and extend the adjusting rope 61. When the locking strip 8821 on the power rod 882 completely disengages from the locking groove 8812 and enters the switching chamber 8811, the winding sleeve 881 and power rod 882 are rotatably connected. The winding sleeve 881 will no longer rotate with the power rod 882, thus stopping its rotation. During the movement of power rod 882 and power rod 884, due to the cooperation of locking strips 8822 and 8841 with the locking groove 8831, the two rotating sleeves 88... 3 will always be fitted around and rotate with power rod 1 882 and power rod 2 884. Therefore, when the winding sleeve 881 stops rotating, as long as the dual-shaft motor 82 is not turned off, heat dissipation can continue. Heat dissipation is accelerated by cooperating with the heat dissipation system of the converter transformer itself. The heat dissipation system of the converter transformer itself is existing technology. For example, multiple cooling fans are set on one side of the converter transformer for air cooling or liquid cooling. These are existing technologies and are not marked in the attached drawings. Their structure is not specifically limited here.

[0052] It should be noted that the winding sleeve rod 881 in this embodiment has a limiting device, that is, when it is not in use, the adjusting rope 61 will not pull the winding sleeve rod 881 to rotate due to the gravity of the inner sampling tube 14. The limiting device for limiting the shaft is existing technology, so its specific structure is not limited.

[0053] The winding sleeve 881 has a switching chamber 8811 inside. One end of the switching chamber 8811 is connected to two snap-fit ​​grooves 8812 that match the snap-fit ​​strip 8821. Both ends of the winding sleeve 881 are provided with support plates 73. The winding sleeve 881 passes through the support plates 73 and is rotatably connected to the support plates 73 through bearings. The support plates 73 are fixed to the top of the support bridge 7. The support bridge 7 is fixed to the top of the upper sealing plate of the converter transformer 001 by bolts. The power system 8 also includes a telescopic rod 81 and a dual-axis motor 82. The telescopic rod 81 is fixed to the top of the bottom plate of the support bridge 7. The piston rod passes through the through-hole 71 on the side plate of the support bridge 7 and is connected to the C-shaped movable bracket 87. The dual-axis motor 82 is fixed to the top of the C-shaped movable bracket 87. The two output ends of the dual-axis motor 82 are fixedly connected to the other ends of the power rod 1 882 and the power rod 2 884, respectively. Starting the dual-axis motor 82 can drive the power rod 1 882 and the power rod 2 884. Through the meshing of the bevel gear 2 84 and the bevel gear 1 83, the heat dissipation part 4 starts to operate. The extension and retraction of the piston rod of the telescopic rod 81 causes the C-shaped movable bracket 87 to drive the dual-axis motor 82 to move, changing the position of the dual-axis motor 82, thereby allowing the selection of whether to deactivate the winding sleeve rod 881.

[0054] It should be further noted that the telescopic pole 81 can be an electric telescopic pole, or a pneumatic or hydraulic telescopic pole, depending on the usage scenario.

[0055] The support bridge 7 has a sliding rod 72 fixed on one side. The outer side of the support bridge 7 is provided with two L-shaped upright plates 86 fixed to the top of the upper sealing plate of the converter transformer 001. The L-shaped upright plates 86 are used to support the rotating sleeve rod 883. One end of the rotating sleeve rod 883 is rotatably connected to the L-shaped upright plate 86 through a bearing. The C-shaped moving bracket 87 is slidably connected to the sliding rod 72 through the sliding groove at its bottom. The sliding connection between the sliding rod 72 and the sliding groove at the bottom of the C-shaped moving bracket 87 can improve the directionality of the C-shaped moving bracket 87 when it moves.

[0056] The depth adjustment unit 6 further includes two limiting brackets 64 fixed to the top of the sealing plate of the converter transformer 001 and a supporting inclined rod 66. A supporting shaft 62 is rotatably provided on the upper part between the two supporting inclined rods 66. Two guide wheels 63 for tensioning the adjustment rope 61 are sleeved and fixed on the outer wall of the supporting shaft 62. The adjustment rope 61 is wound around the winding sleeve rod 881 through the guide wheels 63. A separating block 85 for separating the two adjustment ropes 61 is sleeved in the middle of the winding sleeve rod 881. The two limiting brackets 64 are located on the front and rear sides of the elongated oval adjustment plate 65 and are arranged facing each other. A limiting groove 641 is provided on the limiting bracket 64. After the adjustment rope 61 is guided by the guide wheels 63, it is wound around the winding sleeve rod 881, which not only tensions the adjustment rope 61, but also guides the adjustment rope 61 to improve its directionality when it is wound up and down. With the help of the separating block 85 to separate the two adjustment ropes 61, the two adjustment ropes 61 can be effectively prevented from tangling together.

[0057] One end of the adjusting rope 61 is provided with a mounting screw 611 that can pass through a through hole on the elongated oval adjusting plate 65. The mounting screw 611 is fixedly connected to the elongated oval adjusting plate 65 via a mounting nut 67. Both sides of the elongated oval adjusting plate 65 are symmetrically provided with sliding blocks 651 that slide in conjunction with the limiting slide groove 641. The threaded connection between the mounting screw 611 and the mounting nut 67 makes it easy for the operator to install the adjusting rope 61 on the elongated oval adjusting plate 65. Compared with using a lifting ring and hook connection, the adjusting rope 61 is less prone to shaking. The sliding block 651 slides in conjunction with the limiting slide groove 641, and together with the two adjusting ropes 61, it is more conducive to maintaining the balance of the elongated oval adjusting plate 65, which can further reduce the shaking of the elongated oval adjusting plate 65, thereby improving the stability of the inner sampling tube 14 and effectively avoiding the problem of damage caused by the inner sampling tube 14 colliding with the outer protective sleeve rod 11 when it moves.

[0058] The heat dissipation unit 4 consists of a driven rod 41 and a mounting bracket 43 fixed to the top of the upper sealing plate of the converter transformer 001. One end of the driven rod 41 is rotatably connected to the mounting bracket 43 through a bearing. Multiple fan-shaped fan blades 42 arranged in a linear array are sleeved and fixed on its outer wall. The bevel gear 83 is sleeved and fixed to the other end of the driven rod 41. The bevel gear 83 drives the driven rod 41 to rotate, so that the driven rod 41 drives the fan-shaped fan blades 42 to rotate above the converter transformer 001 to fan the air, thereby accelerating the speed at which the heat dissipation fins dissipate heat.

[0059] The fixed-point isolation assembly consists of a sealing piston 15 and an arc-shaped isolation strip 12 fixed to the top of the sealing piston 15 and in contact with the outer wall of the inner sampling tube 14. The sealing piston 15 is slidably disposed inside the outer protective sleeve 11, and its top has a toothed engagement groove 151. The arc-shaped isolation strip 12 is also in contact with the inner wall of the outer protective sleeve 11 to seal the fixed-point sampling hole 111. L-shaped through-holes 122 are opened at both ends of the arc-shaped isolation strip 12, and a set of oil sampling holes 121 communicating with the sampling port are also opened at the lower end of the arc-shaped isolation strip 12. The upper part of the inner sampling tube 14 is fitted with a limiting block 13 whose bottom is in contact with the top of the arc-shaped isolation strip 12, and the lower end is fixed with a toothed engagement joint 141 that engages with the toothed engagement groove 151. Two L-shaped through-holes 122 are also fixed on its outer wall. The L-shaped snap-fit ​​strip 142 is snapped into the L-shaped through-hole 122. Then, the fixed-point isolation component is moved from bottom to top, so that the arc-shaped isolation strip 12 moves along the outer wall of the inner sampling tube 14 until the arc-shaped isolation strip 12 moves to the top and is blocked by the limiting block 13. The sealing piston 15 is also fixed at the bottom of the inner sampling tube 14 by the snap-fit ​​connection between the toothed snap-fit ​​groove 151 and the toothed snap-fit ​​connector 141. The arc-shaped isolation strip 12 and the sealing piston 15 do not need to be installed separately. The cooperation between the L-shaped snap-fit ​​strip 142 and the L-shaped through-hole 122 plays a positioning role. The toothed snap-fit ​​groove 151 and the toothed snap-fit ​​connector 141 are automatically aligned, thereby achieving the purpose of quick installation. The limiting block 13 limits the arc-shaped isolation strip 12 and also limits the lowest point of the movement of the inner sampling tube 14.

[0060] The limiting bracket 5 includes a mounting plate 53 bolted to one side of the limiting stand 64 on the front side, and an arc-shaped inclined support 51 supporting the adjusting rope 61. One side of the mounting plate 53 is provided with two connecting rods 52 welded to the back of the arc-shaped inclined support 51. The adjusting rope 61, after passing through the guide wheel 63, is placed inside the arc-shaped inclined support 51. The arc-shaped inclined support 51 supports and limits the adjusting rope 61, which can effectively avoid the probability of the adjusting rope 61 shaking when it is retracted and extended, and thus help to avoid the problem of the two adjusting ropes 61 intertwining. The mounting plate 53 and the connecting rods 52 make it convenient to install the limiting bracket 5 on the limiting stand 64.

[0061] The monitoring host 2 internally includes a controller, a gas detector electrically connected to the controller, and an oil-gas separator. The outlet of the oil-gas separator is connected to the inlet of the gas detector via a pipe. The conveying system 3 also includes a circulation pump 37, a three-way solenoid valve 36 installed at the outlet of the circulation pump 37, and a three-way solenoid valve 35 installed at the inlet of the circulation pump 37. The other two ends of the three-way solenoid valve 36 are connected to the lower conduit 34 and the transformer oil circulation port of the converter transformer 001 via pipes, respectively. The other two ends of the three-way solenoid valve 35 are connected to the oil inlet and outlet of the oil-gas separator via pipes, respectively. The upper and lower ends of the collection bottle 31 are connected to the upper conduit 33 and the lower conduit 34 via solenoid valves 32, respectively. The lower part of the collection bottle 31 is tapered to reduce transformer oil residue. Switching the upper part of the collection bottle 31... The solenoid valve 32 connects the collection bottle 31 to the internal sampling tube 14, starts the circulation pump 37 and switches the three-way solenoid valve 1 36 and the three-way solenoid valve 2 35 to connect the collection bottle 31 to the oil-gas separator, and sends the collected transformer oil into the oil-gas separator for oil-gas separation. The separated gas is detected by the gas detector, which generates a signal and sends it to the controller. After the controller calculates and analyzes the signal, it generates specific data on the content of characteristic gases and displays it on the screen. The data is also uploaded to the cloud. Then, the circulation pump 37 is started and the three-way solenoid valve 1 36 and the three-way solenoid valve 2 35 are switched to pump the separated transformer oil into the converter transformer 001 (at this time, all solenoid valves 32 are closed). This embodiment has multiple collection bottles 31, so transformer oil from different oil layers that cannot enter the oil-gas separator in time can be temporarily stored.

[0062] It should be further noted that the controller in this embodiment needs to include a communication module that can upload data to the cloud, so that staff who are not at the monitoring host 2 can easily view and analyze the data.

[0063] During operation, when testing is required, the retraction of the piston rod of the telescopic rod 81 causes the C-shaped moving bracket 87 to move, which in turn drives the dual-axis motor 82. At this time, the dual-axis motor 82 moves the power rod 882. When the locking strip 8821 on the power rod 882 is fully inserted into the locking slot 8812, the power rod 882 rotates the winding sleeve rod 881. The height of the elongated oval adjusting plate 65 is adjusted by winding and unwinding the adjusting rope 61 through the rotating winding sleeve rod 881. The elongated oval adjusting plate 65 then moves the inner sampling tube 14 within the outer protective sleeve rod 11. The sampling point is adjusted by adjusting the height of the inner sampling tube 14. Multiple fixed-point sampling holes are located on the outer protective sleeve rod 11. The transformer oil inside the converter transformer 001 is divided into multiple oil layers by the inner sampling tube 14, which can collect transformer oil samples from different oil layers by changing its position. This enables both fixed-point and multi-point detection, improving the accuracy of the detection results. Furthermore, the inner sampling tube 14 moves within the outer protective sleeve 11 without colliding with the internal components of the converter transformer 001. Combined with the fixed-point isolation component that moves with the inner sampling tube 14, it can separate oil samples from other layers. When the fixed-point isolation component moves downwards, it can also squeeze out transformer oil that has entered the outer protective sleeve 11. Therefore, when not sampling, the fixed-point isolation component, which moves up and down within the outer protective sleeve 11 with the inner sampling tube 14, effectively isolates oil samples from other layers. The separation component can improve the fluidity of the transformer oil inside the converter transformer 001, which is beneficial to improving the heat dissipation effect. When the inner sampling tube 14 reaches the predetermined position, the telescopic rod 81 extends, so that the locking strip 8821 on the power rod 882 completely disengages from the locking groove 8812 and enters the switching chamber 8811. The winding sleeve rod 881 stops rotating, and the solenoid valve 32 on the switching collection bottle 31 selects to connect this collection bottle 31 to the inner sampling tube 14. The circulation pump 37 is started and the three-way solenoid valve 36 and the three-way solenoid valve 35 are switched to connect this collection bottle 31 to the oil-gas separator, and the collected transformer oil is sent to the oil-gas separator for oil-gas separation. The separated gas is detected by the gas detector. The gas detector generates a signal and sends it to the controller. After the controller calculates and analyzes the signal, it generates specific data on the content of characteristic gases and displays it on the screen. The data is then uploaded to the cloud. Then, the circulating pump 37 is started and the three-way solenoid valve 1 36 and the three-way solenoid valve 2 35 are switched to pump the transformer oil containing the separated gas into the converter transformer 001. During the above process, the driven rod 41 drives the fan-shaped fan blade 42 to rotate above the converter transformer 001 through the meshing transmission of bevel gear 2 84 and bevel gear 1 83, thereby accelerating the speed at which the heat dissipation fins dissipate heat. Even when the winding sleeve rod 881 stops rotating, the heat dissipation work can continue as long as the dual-shaft motor 82 is not turned off.

[0064] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An online monitoring device for a converter transformer, comprising a fixed-point sampler (1) and a monitoring host (2) located on one side of the converter transformer (001), characterized in that, The fixed-point sampler (1) consists of an outer protective sleeve rod (11) that runs through the sealing plate of the converter transformer (001), a fixed-point isolation component that separates different layers of transformer oil, and an inner sampling tube (14) that slides inside the outer protective sleeve rod (11). A set of sampling ports are opened at the lower part of the inner sampling tube (14), and multiple sets of fixed-point sampling holes (111) are opened radially on the outer protective sleeve rod (11). The top of the fixed-point sampler (1) is provided with a depth adjustment part (6). The depth adjustment part (6) includes an elongated oval adjustment plate (65) for installing the inner sampling tube (14) and an adjustment rope (61) on the top of the elongated oval adjustment plate (65). The adjustment rope (61) is limited and supported by a limiting bracket (5). The fixed-point isolation assembly consists of a sealing piston (15) and an arc-shaped isolation strip (12) fixed to the top of the sealing piston (15) and in contact with the outer wall of the inner sampling tube (14). The sealing piston (15) is slidably disposed inside the outer protective sleeve (11), and a toothed engagement groove (151) is provided on its top. The arc-shaped isolation strip (12) is also in contact with the inner wall of the outer protective sleeve (11) to seal the fixed-point sampling hole (111). The two ends of the arc-shaped isolation strip (12) An L-shaped through-hole (122) is provided, and a set of oil sampling holes (121) communicating with the sampling port are also provided at the lower end of the arc-shaped isolation strip (12). The upper part of the inner sampling tube (14) is fitted with a limiting block (13) whose bottom is attached to the top of the arc-shaped isolation strip (12), and the lower end is fixed with a gear tooth snap joint (141) that snaps into the gear tooth snap groove (151). Two L-shaped snap strips (142) that snap into the L-shaped through-hole (122) are also fixed on its outer wall. The depth adjustment section (6) is provided with heat dissipation section (4) on both the left and right sides to accelerate heat dissipation. The front and rear sides are respectively provided with a conveying system (3) and a power system (8) for conveying transformer oil. The conveying system (3) consists of an upper conduit (33), a lower conduit (34) and a plurality of collection bottles (31) located between the upper conduit (33) and the lower conduit (34). The liquid inlet end of the upper conduit (33) is connected to the liquid outlet of the inner sampling tube (14) through a hose (16). The power system (8) drives the depth adjustment section (6) and the heat dissipation section (4), and is composed of a power rod (88) and a transmission gear set. The power rod (88) includes a winding sleeve rod (881) and a power rod one (882) located inside the winding sleeve rod (881). The adjustment rope (61) is wound around the winding sleeve rod (881).

2. The online monitoring device for converter transformers according to claim 1, characterized in that, The power rod (88) also includes a second power rod (884) and two rotating sleeve rods (883). The inner wall of the rotating sleeve rod (883) is symmetrically provided with a second locking groove (8831). The outer wall of the second power rod (884) is fixed with a second locking strip (8841) that matches the second locking groove (8831). One of the rotating sleeve rods (883) is sleeved on the outside of the second power rod (884) through the second locking strip (8841) and the second locking groove (8831). Furthermore, a snap-fit ​​strip 1 (8821) and a snap-fit ​​strip 3 (8822) are fixed on the outer wall of the power rod 1 (882). Another rotating sleeve rod (883) is sleeved on one end of the power rod 1 (882) through the engagement of the snap-fit ​​strip 3 (8822) and the snap-fit ​​through groove 2 (8831). The transmission gear set is composed of bevel gear 1 (83) and bevel gear 2 (84) sleeved and fixed on the rotating sleeve rod (883). Bevel gear 2 (84) meshes with bevel gear 1 (83).

3. The online monitoring device for converter transformers according to claim 2, characterized in that, The winding sleeve (881) has a switching chamber (8811) inside. One end of the switching chamber (8811) is connected to two snap-fit ​​grooves (8812) that match the snap-fit ​​strip (8821). Both ends of the winding sleeve (881) are provided with support plates (73). The winding sleeve (881) passes through the support plates (73) and is rotatably connected to the support plates (73) through bearings. The support plates (73) are fixed to the top of the support bridge (7). The support bridge (7) is fixed to the top of the support bridge (7) by bolts. The converter transformer (001) is sealed at the top of the plate, and the power system (8) also includes a telescopic rod (81) and a dual-axis motor (82). The telescopic rod (81) is fixed to the top of the bottom plate of the support bridge (7), and its piston rod passes through the through hole (71) on the side plate of the support bridge (7) and is connected to the C-shaped moving bracket (87). The dual-axis motor (82) is fixed to the top of the C-shaped moving bracket (87), and the two output ends of the dual-axis motor (82) are fixedly connected to the other ends of the power rod one (882) and the power rod two (884) respectively.

4. The online monitoring device for converter transformers according to claim 3, characterized in that, A sliding rod (72) is fixed on one side of the support bridge (7). Two L-shaped upright plates (86) are fixed to the top of the upper sealing plate of the converter transformer (001) on the outside of the support bridge (7). The L-shaped upright plates (86) are used to support the rotating sleeve rod (883). One end of the rotating sleeve rod (883) is rotatably connected to the L-shaped upright plate (86) through a bearing. The U-shaped movable bracket (87) is slidably connected to the sliding rod (72) through the sliding groove at its bottom.

5. The online monitoring device for converter transformers according to claim 1, characterized in that, The depth adjustment unit (6) also includes two limiting brackets (64) fixed to the top of the sealing plate of the converter transformer (001) and a support rod (66). A support shaft (62) is rotatably provided on the upper part between the two support rods (66). Two guide wheels (63) for tensioning the adjustment rope (61) are sleeved and fixed on the outer wall of the support shaft (62). The adjustment rope (61) is wound around the winding sleeve rod (881) through the guide wheels (63). A dividing block (85) separating the two adjustment ropes (61) is sleeved in the middle of the winding sleeve rod (881). The two limiting brackets (64) are located on the front and rear sides of the elongated oval adjustment plate (65) and are arranged facing each other. A limiting groove (641) is provided on the limiting bracket (64).

6. The online monitoring device for converter transformers according to claim 5, characterized in that, One end of the adjusting rope (61) is provided with an installation screw (611) that can pass through the through hole on the elongated oval adjusting plate (65). The installation screw (611) is fixedly connected to the elongated oval adjusting plate (65) via an installation nut (67). Both sides of the elongated oval adjusting plate (65) are symmetrically provided with sliding blocks (651) that slide in cooperation with the limiting slide groove (641).

7. The online monitoring device for converter transformers according to claim 2, characterized in that, The heat dissipation part (4) consists of a driven rod (41) and a mounting bracket (43) fixed to the top of the upper sealing plate of the converter transformer (001). One end of the driven rod (41) is rotatably connected to the mounting bracket (43) through a bearing. Multiple fan-shaped fan blades (42) arranged in a linear array are sleeved and fixed on its outer wall, and the bevel gear (83) is sleeved and fixed to the other end of the driven rod (41).

8. The online monitoring device for converter transformers according to claim 1, characterized in that, The limiting bracket (5) includes a mounting plate (53) bolted to one side of the limiting stand (64) on the front side and an arc-shaped inclined support (51) supporting the adjustment rope (61). The mounting plate (53) has two connecting rods (52) welded to the back of the arc-shaped inclined support (51) on one side.

9. The online monitoring device for converter transformers according to claim 1, characterized in that, The monitoring host (2) is equipped with a controller, a gas detector electrically connected to the controller, and an oil-gas separator. The outlet of the oil-gas separator is connected to the inlet of the gas detector via a pipe. The conveying system (3) also includes a circulation pump (37), a three-way solenoid valve one (36) installed at the outlet of the circulation pump (37), and a three-way solenoid valve two (35) installed at the inlet of the circulation pump (37). The other two ends of the three-way solenoid valve one (36) are connected to the lower conduit (34) and the transformer oil circulation port of the converter transformer (001) via pipes, respectively. The other two ends of the three-way solenoid valve two (35) are connected to the oil inlet and outlet of the oil-gas separator via pipes, respectively. The upper and lower ends of the collection bottle (31) are connected to the upper conduit (33) and the lower conduit (34) via solenoid valves (32), respectively. The lower part of the collection bottle (31) is cone-shaped, which can reduce the residue of transformer oil.

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