Transformer winding temperature monitoring support

Abstract

The application relates to the field of transformer online monitoring technology in power transmission and transformation equipment, and discloses a transformer winding temperature monitoring support, which comprises a base, the outer periphery of the base is provided with mutually symmetrical guide grooves in the axial direction, a clamping assembly is slidably arranged in the guide grooves, the clamping assembly is matched with the threaded holes on the base through an axial adjusting screw rod arranged on the clamping assembly, a nut is arranged at the outer end of the adjusting screw rod and used as a locking piece, the base is provided with a guide piece in the radial direction, a sensor holder slides along the guide piece through a radial sliding block, the sensor holder and the base are detachably connected in the bolt mode through a damping pad and an insulating column, the base is provided with a through cable channel, the cable channel is communicated with a wall bushing through a detachable pipe, a sealing ring is arranged outside the wall bushing and is pressed by a fastening nut, and the outer surface of the base is provided with a positioning surface used for matching with the outer wall of an oil tank.

Description

Technical Field

[0001] This application belongs to the field of transformer online monitoring technology in power transmission and transformation equipment, and specifically relates to a transformer winding temperature monitoring bracket. Background Technology

[0002] With the rapid development of the national power industry, the demand for electricity is also continuously increasing, and power transformers are constantly developing towards larger capacity and higher voltage. As an important power equipment in the power system, the safe and reliable operation of transformers directly affects the power supply quality of the power grid. Overheating faults account for about 63% of the total number of faults. Therefore, effectively implementing online monitoring of transformer temperature is of great significance to ensuring the safe and stable operation of transformers.

[0003] Currently, transformer temperature monitoring devices can be categorized into active and passive temperature measurement methods based on their power source. Active temperature measurement methods include infrared camera temperature measurement, which utilizes infrared imaging principles for real-time temperature detection, but this method is very expensive. Passive temperature sensors mainly include fiber optic temperature sensors and inductively powered temperature sensors. However, while fiber optic temperature sensors use optical fibers as the transmission signal line, offering high temperature measurement accuracy and data transmission quality, they are prone to fiber core breakage during installation and are also costly. Inductively powered temperature sensors require a certain induced current to function properly, limiting their application range. Summary of the Invention

[0004] This application provides a transformer winding temperature monitoring bracket to solve the technical problems of high cost of active temperature measurement and easy breakage of optical fiber core by passive temperature measurement.

[0005] The technical solution adopted in this application is as follows: A transformer winding temperature monitoring bracket includes a base. The outer periphery of the base has symmetrical guide grooves arranged axially. A clamping assembly is slidably installed in the guide grooves. The clamping assembly is engaged with a threaded hole on the base via an axial adjusting screw passing through the clamping assembly. A nut is provided at the outer end of the adjusting screw as a locking element. A guide member is arranged radially on the base. A sensor support slides along the guide member via a radial slider. The sensor support and the base are detachably connected by bolts via a vibration damping pad and an insulating post. The base has a through cable channel. The cable channel is connected to a wall bushing via a detachable conduit. A sealing ring is provided on the outside of the wall bushing and is pressed by a fastening nut. The outer surface of the base has a positioning surface for engaging with the outer wall of the oil tank.

[0006] Optionally, the clamping assembly includes two symmetrically arranged clamps, each clamp having a guide flange on its outer side that mates with a guide groove, an adjusting screw passing through the clamp and engaging with a threaded hole on the base, and a nut using a tightening force to create a locking engagement between the clamp and the guide groove.

[0007] Optionally, the outer arc surface of the clamp is fitted to the outer surface of the end insulator of the winding.

[0008] Optionally, the radial slider is connected to the sensor support via a pin, and the guide is provided with a positioning hole, which cooperates with the radial slider stop to achieve radial limiting.

[0009] Optionally, the vibration damping pad is a silicone rubber pad, the insulating column is a polyamide column, the vibration damping pad is connected to the sensor bracket by bolts, and the insulating column is fixed on the vibration damping pad by bolts.

[0010] Optionally, the cable channel is a channel with armored grooves, the conduit is a detachable conduit sleeve, one end of the conduit is connected to the wall bushing, and the outside of the wall bushing is provided with a fastening nut to tighten the sealing ring.

[0011] Optionally, the sensor holder is provided with a sealing wall plate and a clamping cover, which are engaged with the sealing wall plate to form a sealed cavity.

[0012] Optionally, the main load-bearing materials of the base, clamping assembly and sensor holder are stainless steel, and the outer surface of the base is treated with an oil-resistant and heat-resistant coating.

[0013] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows: 1. By setting guide grooves on the outer periphery of the base and cooperating with clamping components and axial adjustment screws, controllable clamping and locking of the outer surface of the winding end insulation component can be achieved. During installation, the screws can be adjusted to achieve accurate contact and the nuts can be tightened to ensure operational stability, thereby improving the repeatability and vibration resistance of on-site installation. 2. A detachable sensor support is installed on the base, and a combination of radial slider, vibration damping pad and insulating column is used to improve the mechanical vibration isolation and electrical insulation performance of the sensor, thereby ensuring the stability and long-term reliability of temperature measurement. 3. The combination of the base, cable channel, detachable conduit, and wall bushing constitutes a standardized cable lead-out and oil sealing device, which facilitates on-site laying, maintenance, and replacement, and reduces the risk of leakage at the wall passage of the oil tank. 4. The quick-release snap-fit ​​and detachable structure of the sensor bracket reduces the workload of sensor disassembly and maintenance. There is no need to disassemble the base or clamp during maintenance, which improves on-site maintenance efficiency and shortens repair time. 5. The main load-bearing components are made of stainless steel and the base surface is treated with an oil-resistant and heat-resistant coating, which enhances the corrosion resistance and service life of the bracket and makes it suitable for long-term oil immersion environment operation. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a three-dimensional schematic diagram of the transformer winding temperature monitoring bracket of this application; Figure 2 This is a three-dimensional schematic diagram of the clamping components in the transformer winding temperature monitoring bracket of this application; Figure 3 This is a three-dimensional schematic diagram of the cable channel in the transformer winding temperature monitoring bracket of this application; Figure 4 This is a three-dimensional schematic diagram of the guide component in the transformer winding temperature monitoring bracket of this application; Figure 5 This is a cross-sectional view of the guide component in the transformer winding temperature monitoring bracket of this application; 1. Base; 2. Guide groove; 3. Clamping assembly; 31. Fixture; 4. Adjusting screw; 5. Guide component; 51. Positioning hole; 6. Sensor support; 7. Radial slider; 71. Stop; 8. Vibration damping pad; 9. Insulating column; 10. Cable channel; 11. Through-wall sleeve; 12. Sealing ring; 13. Positioning surface; 14. Insulating component; 15. Sealing wall plate; 16. Pressing cover; 17. Oil tank. Detailed Implementation

[0015] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0016] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.

[0017] A transformer winding temperature monitoring bracket includes a base 1. Symmetrical guide grooves 2 are arranged along the axial direction on the outer periphery of the base 1. A clamping assembly 3 is slidably installed in the guide grooves 2. The clamping assembly 3 is engaged with a threaded hole on the base 1 by an axial adjusting screw 4 passing through the clamping assembly 3. A nut is provided at the outer end of the adjusting screw 4 as a locking element. A guide member 5 is arranged radially on the base 1. A sensor support 6 slides along the guide member 5 by a radial slider 7. The sensor support 6 and the base 1 are detachably connected by bolts through a vibration damping pad 8 and an insulating column 9. The base 1 has a through cable channel 10. The cable channel 10 is connected to a wall sleeve 11 through a detachable conduit. A sealing ring 12 is provided on the outside of the wall sleeve 11 and is pressed by a fastening nut. The outer surface of the base 1 has a positioning surface 13 for engaging with the outer wall of an oil tank 17.

[0018] When using the bracket of this application, first place the base 1 against the corresponding position on the outer wall of the target oil tank 17, confirm that the positioning surface 13 fits against the outer wall of the oil tank 17 and is aligned with the external mating reference, and fix the base 1 to the top wall of the transformer with bolts. Then check whether the thread fit at the cable channel 10 and the conduit interface of the base 1 and the sealing ring 12 between the conduit and the wall bushing 11 are intact.

[0019] Furthermore, the clamping assembly 3 includes two symmetrically arranged clamps 31. Each clamp 31 has a guide flange on its outer side that mates with the guide groove 2. The adjusting screw 4 passes through the clamp 31 and mates with the threaded hole on the base 1. The nut locks the clamp 31 and the guide groove 2 together by tightening force.

[0020] Furthermore, the outer arc surface of the clamp 31 is attached to the outer surface of the end insulation member 14 of the winding.

[0021] After the initial inspection, slide the clamp 31 into the guide groove 2, ensuring that the guide flange of the clamp 31 mates with the guide groove 2. Insert the adjusting screw 4 through the clamp 31 and align it with the threaded hole on the base 1. Fit a nut onto the outer end of the screw and hand-tighten it several turns to maintain the screw's position. Move the clamp 31 as a whole towards the winding until the outer arc surface of the clamp 31 contacts the outer surface of the winding end insulator 14. Tighten the adjusting screw 4 clockwise to bring the clamp 31 radially against the contact surface along the guide groove 2. After achieving the required preload displacement, tighten the nut as a locking element to lock it in place.

[0022] Furthermore, the radial slider 7 is connected to the sensor support 6 via a pin, and the guide 5 is provided with a positioning hole 51, which cooperates with the stop part 71 of the radial slider 7 to achieve radial limiting.

[0023] Next, place the sensor bracket 6 on one side of the radial guide 5, insert the radial slider 7 into the guide 5, and connect it to the sensor bracket 6 with a pin, confirming that the slider can slide smoothly within the guide 5. Then, place the vibration damping pad 8 at the preset position between the sensor bracket 6 and the base 1, and place the insulating post 9 in the corresponding hole of the vibration damping pad 8. Use bolts to pass through the vibration damping pad 8 and the insulating post 9 and screw them into the screw holes of the sensor bracket 6.

[0024] Furthermore, the sensor support 6 is provided with a sealing wall plate 15 and a pressing cover 16, which are engaged with the sealing wall plate 15 to form a sealed cavity.

[0025] Place the sensor body on the mounting surface of the sensor bracket 6, then snap and fasten the corresponding parts of the clamping cover 16 and the sealing wall plate 15. Confirm that the buckle is in place and there is a clear feeling of tightness or a clicking sound. Check the positioning and clamping status of the sensor in the sensor bracket 6, and confirm that the sensor faces the winding direction and that the gap between the sensor and the measured surface is within the design range.

[0026] Furthermore, the cable channel 10 is a channel with an armored groove, the conduit is a detachable conduit sleeve, one end of the conduit is connected to the wall sleeve 11, and the outside of the wall sleeve 11 is provided with a fastening nut to press the sealing ring 12.

[0027] First, insert the fastening nut onto the cable, then insert the sealing ring 12. Note the orientation of the nut and sealing ring 12; the fastening nut is the outer clamping part, and the sealing ring 12 is located between the tank wall and the through-wall sleeve 11. Thread the cable from the sensor end into the cable channel 10 of the base 1, pushing it along the armored groove until the end of the conduit is near the through-wall sleeve 11. Insert the cable, along with the end of the sealing ring 12, into the through-wall sleeve 11, positioning the sealing ring 12 in the gap between the tank wall and the through-wall sleeve 11. Place the fastening nut on the outside of the sealing ring 12, first hand-tightening it to position it, then using a wrench to tighten it evenly until the sealing ring 12 is compressed without any noticeable gap.

[0028] Connect and fix the conduit to the wall sleeve 11 using clamps or flanges to ensure that the conduit is aligned with the inner cavity of the wall sleeve 11 without misalignment.

[0029] Furthermore, the vibration damping pad 8 is a silicone rubber pad, the insulating column 9 is a polyamide column, the vibration damping pad 8 is connected to the sensor bracket 6 by bolts, and the insulating column 9 is fixed on the vibration damping pad 8 by bolts.

[0030] Furthermore, the main load-bearing materials of the base 1, clamping assembly 3 and sensor support 6 are stainless steel, and the outer surface of the base 1 is treated with an oil-resistant and heat-resistant coating.

[0031] Working principle: The base 1 is fixed to the outer wall of the oil tank 17 to form a support reference. The clamping assembly 3 is assembled in the guide groove 2 of the base 1. The axial adjustment screw 4 passes through the clamping assembly 3 and engages with the threaded hole of the base 1. By tightening the adjustment screw 4, the clamp 31 moves along the guide groove 2 closer to the outer surface of the winding end insulator 14, thereby providing a stable mechanical clamping force in the axial direction. The nut acts as a locking element to lock the position and prevent displacement caused by vibration during operation.

[0032] The sensor support 6 is mounted on the radial guide 5 of the base 1 and is adjustable in position via a radial slider 7. It is locked in place by a stop 71 on the radial slider 7 engaging with a positioning hole 51 on the guide 5. A vibration damping pad 8 is placed between the sensor support 6 and the base 1 to buffer mechanical vibrations, while an insulating post 9 provides electrical isolation. When the vibration damping pad 8 abuts against the base 1, the insulating post 9 inserts into the receiving groove of the base 1. The two are connected by bolts to ensure structural integrity. This configuration keeps the sensor in a relatively fixed range during operation and provides mechanical and electrical protection, thereby ensuring the stability and security of the measurement data.

[0033] The sensor cable enters the detachable conduit through the through cable channel 10 of the base 1. The conduit is connected to the wall bushing 11, and the sealing ring 12 on the outside of the wall bushing 11 is tightened by the fastening nut to form a wall seal. This path forms a closed mechanical protection and oil sealing channel inside and outside the oil tank 17, ensuring oil and gas isolation at the cable outlet and meeting the sealing requirements of the long-term operating environment of the oil tank 17.

[0034] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0035] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0036] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A transformer winding temperature monitoring bracket, comprising a base (1), characterized in that: The base (1) has symmetrical guide grooves (2) arranged along the axial direction on its outer periphery. A clamping assembly (3) is slidably installed in the guide groove (2). The clamping assembly (3) is engaged with the threaded hole on the base (1) through an axial adjusting screw (4) passing through the clamping assembly (3). A nut is provided at the outer end of the adjusting screw (4) as a locking element. The base (1) has a guide (5) arranged along the radial direction. The guide (5) is slidably connected to a sensor support (6) through a radial slider (7). The sensor support (6) and the base (1) are detachably connected by bolts through a vibration damping pad (8) and an insulating column (9). The base (1) has a through cable channel (10). The cable channel (10) is connected to a wall sleeve (11) through a detachable conduit. A sealing ring (12) is provided on the outside of the wall sleeve (11) and is pressed by a fastening nut. The outer surface of the base (1) has a positioning surface (13) for engaging with the outer wall of the oil tank (17).

2. The bracket according to claim 1, characterized in that: The clamping assembly (3) includes two symmetrically arranged clamps (31). Each clamp (31) has a guide flange on its outer side that cooperates with the guide groove (2). The adjusting screw (4) passes through the clamp (31) and cooperates with the threaded hole on the base (1). The nut locks the clamp (31) and the guide groove (2) by tightening force.

3. The bracket according to claim 2, characterized in that: The outer arc surface of the clamp (31) is attached to the outer surface of the end insulating part (14) of the winding.

4. The bracket according to claim 1, characterized in that: The radial slider (7) is connected to the sensor support (6) by a pin. The guide (5) is provided with a positioning hole (51). The positioning hole (51) cooperates with the stop part (71) of the radial slider (7) to achieve radial limiting.

5. The bracket according to claim 1, characterized in that: The vibration damping pad (8) is a silicone rubber pad, the insulating column (9) is a polyamide column, the vibration damping pad (8) is connected to the sensor bracket (6) by bolts, and the insulating column (9) is fixed on the vibration damping pad (8) by bolts.

6. The bracket according to claim 1, characterized in that: The cable channel (10) is a channel with armored grooves, the conduit is a detachable conduit sleeve, one end of the conduit is connected to the wall sleeve (11), and the outside of the wall sleeve (11) is provided with a fastening nut to press the sealing ring (12).

7. The bracket according to claim 1, characterized in that: The sensor support (6) is provided with a sealing wall plate (15) and a pressing cover (16), and the pressing cover (16) is engaged with the sealing wall plate (15) to form a sealed cavity.

8. The bracket according to claim 1, characterized in that: The main load-bearing materials of the base (1), clamping assembly (3) and sensor support (6) are stainless steel, and the outer surface of the base (1) is treated with an oil-resistant and heat-resistant coating.

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