Insulating oil self-circulation device for single hydrogen sensor

Abstract

The invention relates to the technical field of detection devices for insulating oil in transformer bushings, in particular to a self-circulation device for insulating oil of a single hydrogen sensor. Comprising a shell, a telescopic device is installed in the shell, a cylinder lug is fixedly installed on a telescopic rod of the telescopic device, the outer side of the cylinder lug is sleeved with a fixing cover, a pressure sensor is fixedly installed on the fixing cover, a cylinder barrel is fixedly installed in the shell, and a telescopic pipe is connected between the cylinder lug and the cylinder barrel in a sealed mode. The detection ends of the single hydrogen sensor and the pressure sensor are located in the telescopic pipe. The device is reasonable and compact in structure and convenient to use, the telescopic device is installed in the shell, the telescopic pipe is connected between the telescopic device and the cylinder barrel in a sealed mode, insulating oil in the transformer bushing is circulated through stretching and retracting of the telescopic rod, the purpose of detecting insulating oil data in real time to prevent transformer faults is achieved, and the device has the advantages of being safe, reliable and accurate in detection and has wide application prospects. Operation is facilitated, detection efficiency is improved, and safe and stable operation of the transformer is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of detection devices for insulating oil inside transformer bushings, and is a single hydrogen sensor insulating oil self-circulation device. Background Art

[0002] A single hydrogen sensor is a device used to monitor the state of insulating oil inside a transformer bushing. Its importance lies in being able to monitor the operation status of the transformer in real time, thereby preventing faults and ensuring safe operation. This sensor is mainly used to detect the hydrogen content in the insulating oil. Since hydrogen is an indicator of transformer faults, the presence of internal faults in the transformer can be judged by monitoring its content. In addition to the hydrogen content, the single hydrogen sensor can also monitor the oil temperature and oil pressure, and these parameters are important indicators of the health status of the transformer.

[0003] Online monitoring can detect abnormal conditions of the transformer in real time, such as partial discharge or internal faults, which may lead to the generation of hydrogen and an increase in oil temperature, thereby affecting the oil pressure. The single hydrogen sensor is usually installed at the oil sampling port of the transformer bushing. However, due to the low fluidity of the oil, the oil contacted by the sensor may not represent the actual oil quality state inside the bushing, which may lead to inaccurate monitoring data.

[0004] The patent document with the publication number CN117038271A discloses an insulating oil treatment device for circulating purification and its control method, including an insulating oil chargeability measuring device and an insulating oil circulating purification treatment device connected by an insulating pipe. The insulating oil chargeability measuring device is used to measure the oil flow chargeability tendency of synthetic ester insulating oil during the circulating purification process and fully discharge the charged synthetic ester insulating oil; the insulating oil circulating purification treatment device is used to perform circulating purification treatment on the synthetic ester insulating oil after the insulating oil chargeability measuring device fully discharges it and suppress the oil flow charge. The present invention, through the insulating oil chargeability measuring device and the insulating oil circulating purification treatment device, not only realizes the real-time measurement of the chargeability tendency of the insulating oil, but also realizes the circulating purification treatment of the insulating oil and achieves the effect of suppressing the oil flow charge in the insulating oil. However, the device has a complex structure and does not disclose the structure for hydrogen and pressure detection; at the same time, there are no relevant literatures on the circulation of a small amount of insulating oil inside the bushing, hydrogen and pressure detection.

[0005] In order to ensure the accuracy of monitoring data, a device is needed that can actively exchange the insulating oil inside the single hydrogen sensor with the insulating oil inside the bushing to achieve real-time circulation and update. By designing a self-circulation device, it can be ensured that the oil sample monitored by the single hydrogen sensor is consistent with the actual oil sample inside the transformer bushing, thereby providing more accurate monitoring data. Summary of the Invention

[0006] The present invention provides a single-hydrogen sensor insulating oil self-circulation device, which overcomes the deficiencies of the above-mentioned prior art. It can effectively solve the problems that the existing device has a complex structure and does not disclose the structures for hydrogen and pressure detection. At the same time, there are also no relevant literatures regarding the circulation of a small amount of insulating oil in the bushing, hydrogen and pressure detection.

[0007] The technical solution of the present invention is achieved through the following measures: A single-hydrogen sensor insulating oil self-circulation device includes a housing. A telescopic device is fixedly installed at the left part of the cavity of the housing. There is a telescopic rod extending rightward inside the telescopic device. A cylinder ear is fixedly installed at the right end of the telescopic rod. A fixed cover is sleeved outside the cylinder ear. A pressure sensor is fixedly installed on the fixed cover respectively. A cylinder barrel with an opening facing left and in a cup shape is fixedly installed at the right part of the cavity of the housing. A telescopic tube is sealingly connected between the cylinder ear and the cylinder barrel. The detection end of the pressure sensor is located inside the telescopic tube. An oil inlet end is provided at the right end of the cylinder barrel, and the oil inlet end is located outside the housing.

[0008] The following is a further optimization and / or improvement of the above-mentioned technical solution of the invention: At least three inner lining pieces are fixedly connected at intervals along the circumference at the left end of the cylinder barrel. A chute is formed between adjacent two inner lining pieces. A limiting plate is fixedly connected at the right end of the cylinder ear. A telescopic tube is sealingly connected between the limiting plate and the cylinder barrel. A limiting block is fixedly connected to the outer circumference of the limiting plate at the position corresponding to the chute, and the limiting block is correspondingly installed in the chute.

[0009] A limiting groove is provided on the left end face of the limiting plate, and the right end of the cylinder ear is fixedly installed in the limiting groove.

[0010] An electric cylinder support is fixedly installed at the left part of the cavity of the housing. The telescopic device is fixedly installed on the electric cylinder support. The telescopic device is an electric cylinder body, and the telescopic rod is an electric push rod. A motor is fixedly installed on the electric cylinder support, and the power output end of the motor is fixedly installed together with the power input end of the electric cylinder body.

[0011] A terminal fixing plate is fixedly installed inside the cavity of the housing. A motor controller and a shielded aviation plug are fixedly installed on the terminal fixing plate respectively. The motor controller is connected to the motor. The signal output ends of the single-hydrogen sensor and the pressure sensor are electrically connected to the signal input ends of the shielded aviation plug respectively. A data cable interface end is provided at the upper right part of the housing.

[0012] The above-mentioned motor controller is a circuit board.

[0013] An installation bottom plate is fixedly installed at the bottom of the housing, and an adhesive plate is fixedly installed at the bottom of the installation bottom plate; or / and, the telescopic tube is a corrugated tube.

[0014] At least two structural adhesive grooves are axially spaced along the bottom of the bonding plate, and the mounting base plate and the bonding plate are fixedly installed together by bolts.

[0015] A sealing ring is installed at the oil inlet end of the cylinder barrel; the bonding plate is an aluminum plate with a thickness of 6 mm; the material of the inner lining is polytetrafluoroethylene; the length of the chute is 58 mm; the stroke of the telescopic rod is 50 mm, and the speed is 12 mm per second; the length of the corrugated pipe is 90 mm, and the volume is 80 ml.

[0016] The structure of the present invention is reasonable and compact, and it is convenient to use. The telescopic device is installed in the housing, and the telescopic pipe is sealed and connected between the telescopic device and the cylinder barrel. The insulating oil in the transformer bushing is circulated by the telescopic movement of the telescopic rod, so as to achieve the purpose of detecting the insulating oil data in real time to prevent transformer failures. It has the characteristics of safety, reliability and accurate detection, which facilitates the operation, improves the detection efficiency, and ensures the safe and stable operation of the transformer. Brief Description of the Drawings

[0017] Attached Figure 1 is a three-dimensional structural schematic diagram of the present invention.

[0018] Attached Figure 2 is a three-dimensional structural schematic diagram of the present invention with the housing removed Figure 1 .

[0019] Attached Figure 3 is a three-dimensional structural schematic diagram of the present invention with the housing removed Figure 2 .

[0020] Attached Figure 4 is a three-dimensional structural schematic diagram of the connection of the motor, the electric cylinder block, the electric push rod and the cylinder barrel in the present invention.

[0021] Attached Figure 5 is a three-dimensional structural schematic diagram of the connection of the cylinder barrel, the telescopic pipe and the limit plate in the present invention.

[0022] Attached Figure 6 is a three-dimensional structural schematic diagram of the bonding plate in the present invention.

[0023] Attached Figure 7 is a three-dimensional structural schematic diagram of the installation of the single-hydrogen sensor insulating oil self-circulation device and the transformer bushing in the present invention.

[0024] Attached Figure 8 is a three-dimensional structural schematic diagram of the connection of the motor, the electric cylinder block and the electric push rod in the present invention.

[0025] The codes in the attached drawings are respectively: 1 is the housing, 2 is the telescopic device, 3 is the telescopic rod, 4 is the cylinder ear, 5 is the fixed cover, 6 is the pressure sensor, 7 is the cylinder barrel, 8 is the telescopic tube, 9 is the oil inlet end, 10 is the inner lining piece, 11 is the sliding groove, 12 is the limit plate, 13 is the limit block, 14 is the limit groove, 15 is the electric cylinder bracket, 16 is the motor, 17 is the terminal fixing plate, 18 is the motor controller, 19 is the shielded aviation plug, 20 is the data line interface end, 21 is the mounting base plate, 22 is the bonding plate, 23 is the structural adhesive groove, 24 is the transformer bushing, 25 is the mono-hydrogen sensor. Detailed implementation mode

[0026] The present invention is not limited by the following embodiments, and the specific implementation mode can be determined according to the technical solution of the present invention and the actual situation.

[0027] In the present invention, for the convenience of description, the description of the relative position relationship of each component is carried out according to the layout mode of the attached drawings of the specification, such as: the position relationships of front, rear, upper, lower, left, right, etc. are determined according to the layout direction of the attached drawings of the specification. Figure 1 The layout direction of the attached drawings of the specification. Figure 1 is used to determine.

[0028] The present invention will be further described below in conjunction with the embodiments and the attached drawings: As shown in the attached Figure 1 , 2 , 3, 4, 5, 7, 8, the mono-hydrogen sensor insulating oil self-circulation device includes a housing 1, a telescopic device 2 is fixedly installed in the left part of the cavity of the housing 1, a telescopic rod 3 extending to the right is arranged in the telescopic device 2, a cylinder ear 4 is fixedly installed at the right end of the telescopic rod 3, a fixed cover 5 is sleeved outside the cylinder ear 4, a pressure sensor 6 is respectively fixedly installed on the fixed cover 5, a cylinder barrel 7 with an opening facing left and in a cup shape is fixedly installed in the right part of the cavity of the housing 1, a telescopic tube 8 is hermetically connected between the cylinder ear 4 and the cylinder barrel 7, the detection end of the pressure sensor 6 is located in the telescopic tube 8, an oil inlet end 9 is arranged at the right end of the cylinder barrel 7, and the oil inlet end 9 is located outside the housing 1. In this way, the telescopic device 2 is installed in the housing 1, the telescopic tube 8 is hermetically connected between the telescopic device 2 and the cylinder barrel 7, and the insulating oil in the transformer bushing 24 is circulated by the telescopic movement of the telescopic rod 3, so as to achieve the purpose of detecting the insulating oil data in real time to prevent transformer failures, with the characteristics of safety, reliability and accurate detection, facilitating operation, improving the detection efficiency, and ensuring the safe and stable operation of the transformer.

[0029] According to actual needs, the above mono-hydrogen sensor insulating oil self-circulation device can be further optimized or / and improved: As shown in the attached Figure 3 , 4As shown in FIGS. 5, at least three lining pieces 10 are fixedly connected to the left end of the cylinder barrel 7 at circumferential intervals, and a chute 11 is formed between adjacent two lining pieces 10. A limiting plate 12 is fixedly connected to the right end of the cylinder ear 4. A telescopic tube 8 is hermetically connected between the limiting plate 12 and the cylinder barrel 7. A limiting block 13 is fixedly connected to the outer circumference of the limiting plate 12 at a position corresponding to the chute 11, and the limiting block 13 is correspondingly installed in the chute 11. The limiting plate 12 can slide left and right within the annular cylinder formed by several lining pieces 10.

[0030] As shown in the attached Figure 4 、 5 As shown in FIGS., a limiting groove 14 is provided on the left end face of the limiting plate 12, and the right end of the cylinder ear 4 is fixedly installed in the limiting groove 14.

[0031] As shown in the attached Figure 2 、 3 As shown in FIGS. 4, an electric cylinder bracket 15 is fixedly installed in the left part of the cavity of the housing 1. The telescopic device 2 is fixedly installed on the electric cylinder bracket 15. The telescopic device 2 is an electric cylinder body, and the telescopic rod 3 is an electric push rod. A motor 16 is fixedly installed on the electric cylinder bracket 15, and the power output end of the motor 16 is fixedly installed together with the power input end of the electric cylinder body. There is an electric push rod extending to the right within the electric cylinder body, and the motor 16 can drive the electric push rod within the electric cylinder body to expand and contract left and right.

[0032] As shown in the attached Figure 1 、 2 As shown in FIGS. 3, 7, a terminal fixing plate 17 is fixedly installed in the cavity of the housing 1. A motor controller 18 and a shielded aviation plug 19 are respectively fixedly installed on the terminal fixing plate 17. The motor controller 18 is connected to the motor 16. The signal output ends of the single hydrogen sensor 25 and the pressure sensor 6 are respectively electrically connected to the signal input end of the shielded aviation plug 19. A data line interface end 20 is provided at the upper right part of the housing 1. The motor controller 18 and the shielded aviation plug 19 are well-known and commonly used in the art. The shielded aviation plug 19 can be a receiver with a data line plugging function in the art. The shielded aviation plug 19 can be correspondingly installed on the data line interface end 20. A control line can be inserted and connected to the shielded aviation plug 19, and the other end of the control line is connected to a repeater.

[0033] As required, the motor controller 18 is a circuit board. The circuit board is well-known and commonly used in the art.

[0034] As shown in the attached Figure 1 、 2 As shown in FIGS. 3, 6, a mounting base plate 21 is fixedly installed at the bottom of the housing 1, and an adhesive plate 22 is fixedly installed at the bottom of the mounting base plate 21; or / and, the telescopic tube 8 is a corrugated tube.

[0035] As shown in the attached Figure 6As shown in the figure, at least two structural adhesive grooves 23 are provided at intervals along the axial direction at the bottom of the bonding plate 22, and the mounting base plate 21 and the bonding plate 22 are fixedly installed together by bolts.

[0036] In the design of the single-hydrogen sensor insulating oil self-circulation device of the present invention, the introduction of the bonding plate 22 and the structural adhesive grooves 23 is to solve the problems of convenience and stability of on-site installation. Since the single-hydrogen sensor 25 is usually installed at the oil sampling port position of the transformer bushing 24 to monitor the hydrogen concentration in the transformer oil, this device needs to be installed beside the single-hydrogen sensor 25. Usually, this means that it will be located on the riser of the transformer bushing 24. This position not only has limited space but also may face adverse factors such as vibration and temperature changes. To ensure the stability of the device during long-term operation, a reliable installation method must be adopted to resist the influence of the external environment, ensuring that both the self-circulation function of the insulating oil can be effectively realized and the device can be stably and reliably installed near the transformer bushing 24.

[0037] By bolt-fixing a bonding plate 22 at the bottom of the mounting base plate 21, the contact area between the device and the mounting surface (such as the riser of the transformer bushing 24) can be increased, thereby improving the installation stability. Considering that the surface of the riser of the transformer bushing 24 may be uneven or made of special materials, the bonding plate 22 can provide a flat and unified installation interface, facilitating the application of structural adhesive for fixation. The provision of special structural adhesive grooves 23 can maintain a uniform thickness when applying the structural adhesive, avoiding the situation of too thick or too thin adhesive layers, which may affect the bonding effect. The design of the structural adhesive grooves 23 also helps to increase the contact area between the structural adhesive and the bonding plate 22 and the mounting surface, further improving the bonding strength. At the same time, the structural adhesive can penetrate into the grooves during the curing process, forming a stronger mechanical locking effect and enhancing the firmness of the connection.

[0038] In summary, the design of the bonding plate 22 and the structural adhesive grooves 23 at its bottom is an indispensable part of the installation process of this device. They not only improve the installation stability of the device but also adapt to the complex and changeable installation environment, ensuring that the device can operate stably beside the transformer bushing 24 for a long time and realizing the effective self-circulation of the insulating oil in the single-hydrogen sensor 25.

[0039] As required, a sealing ring is installed on the oil inlet end 9 of the cylinder barrel 7; the bonding plate 22 is an aluminum plate with a thickness of 6 mm; the inner lining 10 is made of polytetrafluoroethylene; the length of the chute 11 is 58 mm; the stroke of the telescopic rod 3 is 50 mm and the speed is 12 mm per second; the length of the bellows is 90 mm and the volume is 80 mL. The oil inlet end 9 can be a G1 / 4 interface, which is a standard thread interface size commonly used in hydraulic and pneumatic systems. An O-ring is set on the end face to provide better sealing effect at the connection, ensure that the insulating oil can circulate effectively between the bellows and the mono-hydrogen sensor 25, and prevent the infiltration of gas or pollutants at the same time. The O-ring plays a key sealing role here, ensuring the stability of the internal environment of the system and the normal operation of the sensor. The main purpose of setting the O-ring on the end face is to ensure the sealing performance of the insulating oil during circulation in the system, prevent leakage, and at the same time protect the internal mono-hydrogen sensor 25 to ensure that it can accurately detect the hydrogen concentration in a stable environment. The selection of a 6-mm thickness gives the aluminum plate sufficient rigidity and strength to withstand certain loads and pressures, and is suitable for various occasions requiring a certain amount of structural support and strength. As a lightweight metal material, the aluminum plate has the characteristics of low density and light weight, and can ensure strength while being light in weight. Selecting a 6-mm thickness enables the aluminum plate to provide stable structural support when used as the bonding plate 22, ensuring a firm connection with the bonded components.

[0040] When selecting the specific parameters of the electric push rod and the bellows, it is mainly considered how these parameters affect the working efficiency and performance of the insulating oil self-circulation device of the mono-hydrogen sensor.

[0041] The stroke of the electric push rod refers to the maximum distance it can move from fully extended to fully retracted (or vice versa). In the present invention, the electric push rod can push the bellows to perform telescopic movement within a range of 50 mm; it can push the bellows to move 12 mm per second. The above parameters are selected through experiments to ensure the effect of insulating oil renewal while ensuring the uniformity of insulating oil flow.

[0042] The effective length of the bellows, that is, the length in the fully extended state, is selected as 90 mm. Combined with the stroke of the electric push rod, the effective length ensures that the bellows can fully perform telescopic movement under the drive of the electric push rod, thereby realizing the cyclic renewal of the insulating oil.

[0043] The size of the volume directly affects the amount of insulating oil that can be processed in each cycle. A larger volume means that more insulating oil can be processed in a single cycle, thus improving the renewal efficiency; however, an overly large volume may also cause the system response speed to slow down or require a greater driving force to push the bellows to perform telescopic movement. Based on the comprehensive experimental results, 80 mL is selected.

[0044] In summary, parameters such as the stroke and speed of the electric push rod and the effective length and volume of the bellows jointly determine the working efficiency and performance of the single-hydrogen sensor insulating oil self-circulation device. By reasonably setting these parameters, it can be ensured that the device can stably and efficiently realize the circulation and update of the insulating oil, providing a strong guarantee for the safe operation of the transformer.

[0045] The inner liner (composed of at least three inner liner pieces 10) is a vulnerable part of the bellows assembly in the single-hydrogen sensor insulating oil self-circulation device, and its material properties are crucial for the performance and lifespan of the entire device. Polytetrafluoroethylene (PTFE), which is a material with excellent chemical stability, non-stickiness, and low friction coefficient, its low friction coefficient and chemical stability help reduce the wear of the inner liner, extending its maintenance cycle and service life. The length of the long groove (slide groove 11) is 58 mm, that is, the limit stroke is set to 58 mm, which matches the length of the long groove. This means that when the bellows assembly expands and contracts, the long groove on the inner liner can provide sufficient space to ensure that the expansion and contraction of the bellows are not restricted. The setting of the limit plate 12 and the limit block 13 is to control the expansion and contraction range of the bellows assembly and prevent excessive compression. The limit plate 12 is closely arranged against the cylinder ear 4, while the limit block 13 can move within the long groove of the inner liner. When the electric push rod pushes the bellows to expand and contract, the limit block 13 moves along the long groove until it reaches the 58-mm limit stroke.

[0046] Through this design, the combination of the inner liner and the long groove not only improves the performance and reliability of the single-hydrogen sensor insulating oil self-circulation device but also ensures the precise control of the oil circulation and update process, thus providing accurate monitoring data for the transformer bushing 24.

[0047] The housing 1 may include an outer cover and side plates. The design where the bottom of the side plates is bent inward means that while the housing 1 is bolted to the mounting base plate 21, the inward-bent part is embedded between the mounting base plate 21 and the bonding plate 22, and this design further increases the installation stability of the housing 1.

[0048] The inner bending design at the bottom of the side plate actually adds an additional support point to the structure of the housing 1. When the housing 1 is fixed to the mounting base plate 21 through bolts, the inner bending part is in close contact with the mounting base plate 21 and the bonding plate 22, forming a more stable triangular support structure, thereby enhancing the overall strength and stability of the housing 1. The inner bending part is embedded between the mounting base plate 21 and the bonding plate 22, which can effectively prevent the housing 1 from loosening due to vibration or external forces during use. This embedded design increases the contact area between the housing 1 and the mounting base plate 21, improving the reliability of the connection. During the process of bolt tightening, the inner bending part at the bottom of the side plate can disperse the stress generated by the bolts, avoiding local damage caused by stress concentration. This helps to extend the service life of the housing 1 and improve its ability to withstand external loads.

[0049] Improved installation accuracy. The inner bending design makes it easier for the housing 1 to align with the mounting base plate 21 during installation, thereby improving the installation accuracy. At the same time, due to the close contact between the inner bending part and the mounting base plate 21 and the bonding plate 22, the adjustment work during installation is also reduced.

[0050] Enhanced seismic performance. During the operation of the equipment, especially in those occasions that need to withstand large vibrations and impacts, the inner bending design at the bottom of the side plate of the housing 1 can significantly improve the seismic performance of the equipment. It can effectively absorb and disperse vibration energy, protecting the internal components of the equipment from damage.

[0051] In summary, the design of bending the bottom of the side plate of the housing 1 inward is an effective structural strengthening measure. It can not only improve the overall strength and stability of the housing 1, but also prevent loosening, disperse stress, improve installation accuracy and seismic performance.

[0052] The functions of the important components in the present invention: The bellows assembly (bellows) plays a crucial role in the single-hydrogen sensor insulating oil self-circulation device. It realizes the cyclic update of the insulating oil through telescopic movement.

[0053] The inner lining sleeve (composed of at least three inner lining pieces 10) is a part of the bellows assembly. It is sleeved outside the bellows. The function of the inner lining sleeve is to provide additional protection and support to ensure the stability and sealing performance of the bellows during movement.

[0054] The bellows is the core part of the bellows assembly and has the characteristic of being telescopic. It is usually made of metal or other elastic materials and can perform telescopic movement under the drive of the electric cylinder assembly.

[0055] The limit plate 12 is arranged at one end of the bellows away from the oil inlet. Its function is to limit the telescopic range of the bellows, preventing excessive extension or compression, thereby protecting the structural integrity of the bellows.

[0056] Circumferential long grooves of the inner bushing: A number of long grooves are provided in the circumferential direction of the inner bushing. These long grooves allow the inner bushing to move correspondingly when the bellows expands and contracts, restricting the expansion and contraction stroke.

[0057] A limiting block 13 that can move within the long groove (slide groove 11) is provided on the limiting plate 12. The limiting block 13 can move along the long groove when the bellows expands and contracts, further controlling the expansion and contraction range of the bellows.

[0058] Principle of expansion and contraction movement: When the electric push rod of the electric cylinder body assembly is pushed out, it compresses the bellows, resulting in a smaller internal volume of the bellows. At this time, the excess insulating oil will be discharged. When the electric push rod retracts, the bellows will return to its original state, and the internal volume increases. Under the action of the external pressure, the insulating oil will flow back into the bellows.

[0059] Through the expansion and contraction movement of the bellows assembly, the circulation and renewal between the insulating oil in the transformer bushing 24 and the insulating oil in the mono-hydrogen sensor 25 can be achieved; this circulation mechanism ensures that the oil sample monitored by the mono-hydrogen sensor 25 is fresh and can provide more accurate monitoring data.

[0060] The design of the bellows assembly provides a flexible and reliable way of insulating oil circulation. It can adapt to different insulating oil pressures and flow rates, while reducing the wear of mechanical components and extending the service life of the equipment. Through this design, the self-circulation device of the mono-hydrogen sensor insulating oil can effectively monitor and renew the insulating oil in the transformer bushing 24, thereby improving the safety and reliability of the power system.

[0061] Functions of other components in the present invention: 1. Motor 16: The motor 16 is the power source of the electric cylinder body assembly. It starts and stops according to the instructions of the control circuit, thereby driving the movement of the entire electric cylinder body assembly.

[0062] 2. Electric cylinder bracket 15: The electric cylinder bracket 15 is a part installed on the mounting base plate 21, used to fix the motor 16 and the electric cylinder body, ensuring the stable operation of the motor 16 and the correct position of the electric cylinder body.

[0063] 3. Electric cylinder body: An electric push rod is provided inside the electric cylinder body. It is the main executing component of the electric cylinder body assembly, responsible for realizing the expansion and contraction movement of the push rod.

[0064] 4. Electric push rod: The electric push rod is a component that directly interacts with the bellows assembly. It compresses the bellows through the expansion and contraction movement, thereby promoting the flow of insulating oil.

[0065] 5. Pin Shaft: The electric push rod is fixed to the cylinder ear 4 through the pin shaft to ensure a stable connection between the push rod and the cylinder ear 4, while allowing the push rod to move linearly along the axis of the cylinder ear 4.

[0066] 6. Cylinder Ear 4: The cylinder ear 4 is a component fixed to the electric cylinder body, used to support the electric push rod, and cooperate with the fixed cover 5 to form a sealed space.

[0067] 7. Fixed Cover 5: The fixed cover 5 is threadedly connected to the cylinder ear 4, closing the outside of the cylinder ear 4, and jointly constituting the installation space of the bellows assembly with the cylinder barrel 7.

[0068] 8. Cylinder Barrel 7: The cylinder barrel 7 is the accommodating space of the bellows assembly, fixed to the mounting base plate 21 through the electric cylinder bracket 15, providing a stable movement trajectory for the bellows.

[0069] 9. Electric Cylinder Bracket 15: The electric cylinder bracket 15 is used to fix the cylinder barrel 7 to the mounting base plate 21, ensuring the stability and alignment of the cylinder barrel 7.

[0070] Advantages of the present invention: The present invention discloses a single hydrogen sensor insulating oil self-circulation device, which is a monitoring system specially designed for the transformer bushing 24. Its main purpose is to ensure that the single hydrogen sensor 25 can continuously monitor the oil quality consistent with the actual oil sample in the transformer bushing 24. The following is a detailed description of the device: 1. Housing 1 and Mounting Base Plate 21: The device consists of a housing 1 and a mounting base plate 21. The housing 1 is fixed to the mounting base plate 21, providing structural support for the entire device; 2. Electric Cylinder Body Assembly: Installed above one side of the base plate, it is the power source of the device, and realizes the movement of the bellows assembly through electric drive; 3. Bellows Assembly: Connected to the electric cylinder body assembly, and the other end is connected to the oil inlet end 9. The design of the bellows allows insulating oil to flow through it while maintaining the flexibility and sealing of the structure; 4. Oil Inlet End 9: One end of the housing 1 is provided with an oil inlet end 9 for introducing new insulating oil into the device; 5. Pressure Sensor 6, which can be a welded pressure sensor 6, is installed on the upper side of the electric cylinder body assembly, used to monitor the pressure of the insulating oil in real time, ensure the stability of the insulating oil flow, and monitor the pressure state and operation state inside the bellows; 6. Terminal Fixing Plate 17: Located above the welded pressure sensor 6, used to fix the circuit board and other electronic components; 7. Circuit Board, Shielded Aviation Plug 19: Installed on the terminal fixing plate 17, the circuit board is responsible for controlling the operation of the electric cylinder body assembly, and the shielded aviation plug 19 is used to connect external devices, realizing external connection through the bellows joint and transmitting monitoring data.

[0071] The working process of the present invention is as follows: Driven by the electric cylinder body, the bellows moves. With the telescopic movement of the bellows, the insulating oil in the single hydrogen sensor 25 is pumped out, and at the same time, the insulating oil in the transformer bushing 24 is also sucked in. During the reciprocating drive of the electric cylinder body, the insulating oil in the transformer bushing 24 is continuously sucked in and then pushed out, realizing the active exchange and cyclic update of the insulating oil in the single hydrogen sensor 25 and the insulating oil in the bushing. This cyclic update mechanism ensures the real-time and accuracy of the oil sample. Due to the realization of the real-time cyclic update of the oil sample, the single hydrogen sensor 25 can provide monitoring data consistent with the actual oil sample in the transformer bushing 24, thereby improving the accuracy and reliability of the monitoring. This device is crucial for the safe operation of the power system because it can detect and warn of potential faults in a timely manner, reduce the risk of unexpected power outages, and improve the stability and security of power supply. The specific working process is as follows: When the control circuit sends an instruction to the motor 16, the motor 16 starts to rotate and drives the electric push rod to perform telescopic movement in the electric cylinder body. The electric push rod is connected to the cylinder ear 4 through a pin shaft, and transmits the thrust to the bellows assembly. When the electric push rod extends, the bellows is compressed, the internal volume decreases, and the insulating oil is discharged and flows to other parts in the transformer bushing 24; when the electric push rod retracts, the bellows returns to its original state under the action of its own elasticity, the internal volume increases, a negative pressure area is formed, and the insulating oil is sucked into the bellows under the action of the external pressure; through such pushing and pulling actions, the cyclic update of the insulating oil in the transformer bushing 24 and the insulating oil in the single hydrogen sensor 25 is realized. During the whole process, each component of the electric cylinder body assembly closely cooperates and works together to ensure the accuracy and reliability of the insulating oil cyclic update. At the same time, since the bellows assembly is accommodated in the cylinder barrel 7 to form a closed space, it effectively prevents the leakage of insulating oil and the entry of external impurities, ensuring the safety and stability of the system.

[0072] During the working process of this device, abnormal monitoring is also required. The welded pressure sensor 6 designed in this device is used to monitor the pressure state of the insulating oil in the bellows. It is connected to the shielded aviation plug 19 through a control line, thereby establishing a channel for electrical signal transmission. The other end is connected to a repeater. This line is responsible for transmitting the data signals from the insulating oil pressure monitoring device in the bellows. When the pressure, temperature or other key parameters of the insulating oil change, the monitoring device will convert these changes into electrical signals and transmit them to the repeater through the control line. The repeater, as a data transfer station, receives the monitoring data from the control line and further transmits it to the system background. This process realizes the remote monitoring and real-time analysis of the data. The system background performs real-time analysis on the received data. Once data anomalies are found (such as the insulating oil pressure exceeding the normal range, the temperature being too high, etc.), it will immediately trigger the alarm mechanism and instruct to stop the device operation for maintenance. This immediate response mechanism helps to prevent potential equipment failures and safety accidents.

[0073] The oil inlet end 9 can be connected through a stainless steel braided bellows by G1 / 4 union nuts at both ends. This connection method not only ensures the firmness of the connection but also facilitates future maintenance and replacement.

[0074] Under electric drive, the single hydrogen sensor 25 and the insulating oil in the bellows start to circulate. This circulation process not only promotes the uniform distribution and temperature balance of the insulating oil but also ensures that the single hydrogen sensor 25 can continuously monitor an oil sample consistent with the actual oil sample in the transformer bushing 24, which is crucial for improving the accuracy and reliability of the monitoring data.

[0075] By real-time monitoring of key parameters such as the pressure and temperature of the insulating oil, the system can timely detect potential equipment failures and safety hazards. At the same time, through the monitoring of hydrogen in the insulating oil by the single hydrogen sensor 25, it is possible to further judge whether there are abnormal conditions such as partial discharge inside the transformer.

[0076] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effects. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A single-hydrogen sensor insulating oil self-circulation device, characterized in that It includes a housing. A telescopic device is fixedly installed at the left part of the cavity of the housing. There is a telescopic rod extending rightward inside the telescopic device. A cylinder ear is fixedly installed at the right end of the telescopic rod. A fixed cover is sleeved outside the cylinder ear. Pressure sensors are respectively fixedly installed on the fixed cover. A cylinder barrel with an opening facing left and in a cup shape is fixedly installed at the right part of the cavity of the housing. A telescopic tube is sealingly connected between the cylinder ear and the cylinder barrel. The detection end of the pressure sensor is located inside the telescopic tube. An oil inlet end is provided at the right end of the cylinder barrel, and the oil inlet end is located outside the housing.

2. The single-hydrogen sensor insulating oil self-circulation device according to claim 1, wherein At least three inner lining pieces are fixedly connected along the circumference at the left end of the cylinder barrel. A chute is formed between adjacent two inner lining pieces. A limiting plate is fixedly connected at the right end of the cylinder ear. A telescopic tube is sealingly connected between the limiting plate and the cylinder barrel. A limiting block is fixedly connected on the outer periphery of the limiting plate at the position corresponding to the chute, and the limiting block is correspondingly installed in the chute.

3. The single-hydrogen sensor insulating oil self-circulation device according to claim 2, wherein A limiting groove is provided on the left end face of the limiting plate, and the right end of the cylinder ear is fixedly installed in the limiting groove.

4. The single-hydrogen sensor insulating oil self-circulation device according to claim 1 or 2 or 3, characterized in that An electric cylinder bracket is fixedly installed at the left part of the cavity of the housing. The telescopic device is fixedly installed on the electric cylinder bracket. The telescopic device is an electric cylinder body, and the telescopic rod is an electric push rod. A motor is fixedly installed on the electric cylinder bracket, and the power output end of the motor is fixedly installed together with the power input end of the electric cylinder body.

5. The single-hydrogen sensor insulating oil self-circulation device according to claim 4, characterized in that A terminal fixing plate is fixedly installed inside the cavity of the housing. A motor controller and a shielded aviation plug are respectively fixedly installed on the terminal fixing plate. The motor controller is connected to the motor. The signal output ends of the single hydrogen sensor and the pressure sensor are respectively electrically connected to the signal input end of the shielded aviation plug. A data line interface end is provided at the upper right part of the housing.

6. The single-hydrogen sensor insulating oil self-circulation device according to claim 5, characterized in that The motor controller is a circuit board.

7. The single-hydrogen sensor insulating oil self-circulation device according to claim 1 or 2 or 3 or 5 or 6, characterized in that An installation base plate is fixedly installed at the bottom of the housing. An adhesive plate is fixedly installed at the bottom of the installation base plate; or / and, the telescopic tube is a corrugated tube.

8. The single-hydrogen sensor insulating oil self-circulation device according to claim 4, characterized in that An installation base plate is fixedly installed at the bottom of the housing. An adhesive plate is fixedly installed at the bottom of the installation base plate; or / and, the telescopic tube is a corrugated tube.

9. The single-hydrogen sensor insulating oil self-circulation device according to claim 7, wherein At least two structural adhesive grooves are provided at intervals along the axial direction at the bottom of the adhesive plate. The installation base plate and the adhesive plate are fixedly installed together by bolts.

10. The single-hydrogen sensor insulating oil self-circulation device according to claim 8, characterized in that A sealing ring is installed on the oil inlet end of the cylinder barrel; the adhesive plate is an aluminum plate with a thickness of 6 mm; the material of the inner lining piece is polytetrafluoroethylene; the length of the chute is 58 mm; the stroke of the telescopic rod is 50 mm, and the speed is 12 mm per second; the length of the corrugated tube is 90 mm, and the volume is 80 ml.

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