A temperature measuring system for oil-immersed transformer body drying process

Abstract

The utility model relates to a kind of temperature measurement systems for oil-immersed transformer body drying process, including kerosene gas phase drying furnace, temperature measurement optical fiber, optical fiber connecting disc, optical fiber joint, transmission optical fiber and temperature measurement host computer, wherein transformer body is located in kerosene gas phase drying furnace, and the furnace wall of kerosene gas phase drying furnace is equipped with optical fiber connecting disc, and optical fiber connecting disc is equipped with optical fiber joint;Optical fiber joint one end is equipped with the inner interface connected with the tail end of temperature measurement optical fiber, the other end is equipped with the outer interface connected with the head end of transmission optical fiber, and the middle part of optical fiber joint is equipped with the thread segment of the thread connection with optical fiber connecting disc;The temperature measurement element of the head end of temperature measurement optical fiber is located on transformer body, and the tail end of transmission optical fiber is connected with temperature measurement host computer.The utility model utilizes the temperature measurement element of the head end of temperature measurement optical fiber to monitor the temperature condition inside each part of transformer body, improves the temperature measurement precision of drying process, can fully guarantee the sealing performance of optical fiber installation simultaneously, and will not affect the drying operation of kerosene gas phase drying furnace.

Description

Technical Field

[0001] This utility model relates to the field of transformers, specifically a temperature measurement system for the drying process of oil-immersed transformer bodies. Background Technology

[0002] For large-capacity oil-immersed transformers, to ensure effective removal of moisture from the insulation and achieve the designed withstand voltage, the transformer body is typically dried using a kerosene vapor-phase drying method. The basic principle is to use kerosene vapor as a heat transfer medium. The kerosene condenses in a vacuum chamber on the relatively cool transformer body, releasing a large amount of latent heat of vaporization to heat the body. After heating, a high-vacuum system is used to lower the boiling point of water, causing the moisture inside the body to evaporate rapidly and be removed. This method usually employs a vacuum-capable drying furnace for heating and drying the transformer body. For example, patent CN104810135B discloses a kerosene vapor-phase cleaning and drying system for transformer bodies.

[0003] In the kerosene vapor phase drying process, the key indicators for judging the drying effect of the equipment body in existing technologies include time, temperature, vacuum degree, and preset pressure reduction times. Temperature measurement of the equipment body during drying typically involves directly inserting thermocouples into the body. However, due to the different heat capacities of silicon steel sheets and insulating materials, thermocouples generally need to be placed on both the core and the insulating material. Furthermore, due to limitations in product structure and performance requirements, thermocouples cannot be inserted destructively. Therefore, thermocouples only measure the surface temperature and cannot measure the actual temperature of the coils inside the equipment body. Additionally, the accuracy of traditional thermocouple temperature measurement is only ±2 to ±5℃, which is relatively low.

[0004] With technological advancements, fiber optic temperature measurement of transformers has been increasingly adopted. Fiber optics can meet the temperature measurement needs of transformers, while offering significantly improved accuracy compared to thermocouples. For example, patent CN202221693U discloses a fiber optic temperature measurement transformer. However, for kerosene vapor phase drying furnaces with stringent sealing requirements, a key challenge is how to ensure furnace sealing, utilize fiber optic temperature measurement technology to improve detection accuracy, and simultaneously facilitate fiber optic installation. Utility Model Content

[0005] The purpose of this invention is to provide a temperature measurement system for the drying process of oil-immersed transformer bodies. It uses a temperature measuring element at the end of a temperature measuring fiber to monitor the internal temperature of various parts of the transformer body, thereby improving the temperature measurement accuracy during the drying process. At the same time, it can fully ensure the sealing performance of the fiber installation and will not affect the drying operation of the kerosene vapor phase drying furnace.

[0006] The objective of this utility model is achieved through the following technical solution: A temperature measurement system for the drying process of an oil-immersed transformer body includes a kerosene vapor phase drying furnace, a temperature-measuring optical fiber, an optical fiber connector, an optical fiber connector, a transmission optical fiber, and a temperature measurement host. The transformer body is located in the kerosene vapor phase drying furnace. The kerosene vapor phase drying furnace wall is equipped with an optical fiber connector, and the optical fiber connector is equipped with an optical fiber connector. One end of the optical fiber connector has an internal interface that connects to the tail end of the temperature-measuring optical fiber, and the other end has an external interface that connects to the head end of the transmission optical fiber. The middle of the optical fiber connector has a threaded section that connects to the threaded optical fiber connector. The temperature-measuring element at the head end of the temperature-measuring optical fiber is located on the transformer body, and the tail end of the transmission optical fiber is connected to the temperature measurement host.

[0007] The furnace wall of the kerosene vapor phase dryer is provided with an installation sleeve, and the optical fiber connector is sealed and fixed to the outer end face of the installation sleeve.

[0008] The inner end of the mounting sleeve is provided with an inner flange that is sealed and fixed to the inner side of the furnace wall of the kerosene vapor phase dryer.

[0009] The fiber optic connector is fixed to the outer end face of the mounting sleeve by fixing bolts, and a first sealing element is provided between the fiber optic connector and the outer end face of the mounting sleeve.

[0010] The threaded section is tapered with the narrow end near the inner interface, and the fiber optic connector is provided with a tapered threaded hole that mates with the threaded section.

[0011] The fiber optic connector is provided with a limiting nut that abuts against the outer surface of the fiber optic connector, and a second sealing element is provided between the limiting nut and the outer surface of the fiber optic connector.

[0012] Both the internal and external interfaces are provided with locking holes for inserting locking elements.

[0013] The fiber optic connector has a through hole inside that connects the inner interface and the outer interface.

[0014] Temperature sensing elements are installed on the transformer core, inner coil, and outer coil of the transformer body.

[0015] The kerosene vapor phase dryer is equipped with a transformer support, and the transformer body is fixed on the transformer support.

[0016] The advantages and positive effects of this utility model are as follows: 1. The temperature measuring element at the end of the temperature measuring fiber optic head of this utility model can monitor the internal temperature of various parts of the transformer body, thereby greatly improving the temperature measurement accuracy.

[0017] 2. This utility model utilizes an optical fiber connector to connect the internal temperature measuring optical fiber of the kerosene vapor phase dryer with the external transmission optical fiber. It is easy to install, and the optical fiber connector and the mounting sleeve, as well as the optical fiber connector and the optical fiber connector, can be fully sealed, so as not to affect the drying operation of the kerosene vapor phase dryer. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating the usage state of this utility model. Figure 2 for Figure 1 Enlarged view of point A in the image. Figure 3 for Figure 2 Schematic diagram of the fiber optic connector panel. Figure 4 for Figure 3 A schematic diagram of the structure of a fiber optic connector.

[0019] Among them, 1 is the transformer core, 2 is the transformer inner coil, 3 is the transformer outer coil, 4 is the kerosene vapor phase dryer, 401 is the mounting sleeve, 4011 is the inner flange, 5 is the transformer support, 6 is the temperature measuring fiber, 7 is the temperature measuring host, 8 is the fiber optic connection plate, 801 is the fixing hole, 9 is the fiber optic connector, 901 is the external interface, 902 is the threaded section, 903 is the internal interface, 904 is the limit nut, 905 is the locking hole, 10 is the fixing bolt, and 11 is the transmission fiber. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] like Figures 1-2 As shown, this utility model includes a kerosene vapor phase dryer 4, a temperature measuring optical fiber 6, an optical fiber connection tray 8, an optical fiber connector 9, a transmission optical fiber 11, and a temperature measuring host 7. The transformer body is located within the kerosene vapor phase dryer 4. The optical fiber connection tray 8 is mounted on the furnace wall of the kerosene vapor phase dryer 4, and the optical fiber connection tray 8 is equipped with an optical fiber connector 9. Figures 3-4 As shown, one end of the fiber optic connector 9 has an inner interface 903 that connects to the tail end of the temperature-sensing fiber 6, and the other end has an outer interface 901 that connects to the head end of the transmission fiber 11. The middle of the fiber optic connector 9 has a threaded section 902 that connects to the fiber optic connector disc 8. Figure 1 As shown, the temperature sensing element at the head end of the temperature-sensing optical fiber 6 is located in the corresponding part of the transformer body, and the tail end of the transmission optical fiber 11 is connected to the temperature-sensing host 7. The temperature-sensing optical fiber 6, the temperature sensing element, the transmission optical fiber 11, and the temperature-sensing host 7 are all technologies known in the art; for example, see patent CN202221693U. Furthermore, considering the characteristics of the kerosene vapor phase drying process, the temperature-sensing optical fiber 6 is selected as an oil-resistant and high-temperature-resistant optical fiber.

[0022] like Figure 2 As shown, in this embodiment, the furnace wall of the kerosene vapor phase dryer 4 is provided with an installation sleeve 401, and the optical fiber connecting plate 8 is sealed and fixed to the outer end face of the installation sleeve 401. The inner end of the installation sleeve 401 is provided with an inner flange 4011, which is sealed and fixed to the inner side of the furnace wall of the kerosene vapor phase dryer 4 (e.g., by welding).

[0023] like Figures 2-3 As shown, in this embodiment, the fiber optic connector 8 is fixed to the outer end face of the mounting sleeve 401 by the fixing bolt 10, and a first sealing element (such as a high-temperature resistant sealing ring) can be provided between the fiber optic connector 8 and the outer end face of the mounting sleeve 401 to ensure sealing. The fiber optic connector 8 is provided with a fixing hole 801 for the fixing bolt 10 to pass through.

[0024] like Figure 4 As shown, in this embodiment, the threaded section 902 is generally tapered with its narrower end near the inner interface 903. The fiber optic connector 8 has a tapered threaded hole that mates with the threaded section 902. The tapered threaded section 902 and the fiber optic connector 8 are threaded together, which can fully ensure a seal. Additionally, as shown... Figures 2-4 As shown, the fiber optic connector 9 is provided with a limiting nut 904 that abuts against the outer surface of the fiber optic connector 8. The limiting nut 904 is located on the threaded section 902 near the outer interface 901. A second sealing element (such as a high-temperature resistant sealing ring or high-temperature resistant sealant) can be provided between the limiting nut 904 and the outer surface of the fiber optic connector 8 as needed to ensure a seal, which can further ensure a seal.

[0025] like Figure 4 As shown in this embodiment, both the inner interface 903 and the outer interface 901 are provided with locking holes 905. After the fiber end is inserted into the corresponding interface, a locking element (such as a locking pin) is inserted into the locking hole 905 to fix the fiber end.

[0026] like Figure 1 As shown, in this embodiment, a transformer support 5 is provided inside the kerosene vapor phase drying furnace 4, and the transformer body is fixed on the transformer support 5.

[0027] like Figure 1 As shown, in this embodiment, temperature measuring elements are provided on the transformer core 1, the inner coil 2, and the outer coil 3 of the transformer body, and are connected to the corresponding temperature measuring optical fiber 6.

[0028] The working principle of this utility model is as follows: The installation of this utility model includes the following steps: Step 1: Place the temperature sensing elements at the six ends of the temperature-sensing fiber optic cable at the corresponding positions on the transformer body, such as... Figure 1As shown, in this embodiment, temperature measuring elements are provided on the transformer core 1, the inner coil 2, and the outer coil 3 to fully ensure the temperature measurement accuracy during the kerosene vapor phase drying process.

[0029] Step 2: Install the fiber optic connector 9 onto the fiber optic connection tray 8, and then lead out the tail ends of each temperature measuring fiber 6 from the mounting sleeve 401 on the furnace wall of the kerosene vapor phase dryer 4, and connect them to the inner interface 903 on the corresponding fiber optic connector 9.

[0030] Step 3: After each temperature measuring fiber 6 is connected to its corresponding fiber optic connector 9, install the fiber optic connector 8 on the outer end face of the mounting sleeve 401.

[0031] Step 4: Connect the head end of the transmission fiber 11 to the external interface 901 of the corresponding fiber optic connector 9, and the tail end to the temperature measuring host 7. The fiber optic connector 9 has a through hole connecting the internal interface 903 and the external interface 901. Both the temperature measuring fiber 6 and the transmission fiber 11 are inserted into this through hole to achieve data transmission connectivity.

[0032] After installation, the kerosene vapor phase dryer 4 can be started to perform kerosene vapor phase drying on the transformer body. During the drying process, the temperature measuring element at the end of the temperature measuring fiber 6 can monitor the internal temperature of each part of the transformer body, thereby greatly improving the temperature measurement accuracy. At the same time, the fiber optic connector 8 and the mounting sleeve 401, as well as the fiber optic connector 9 and the fiber optic connector 8, can be sealed, so as not to affect the drying operation of the kerosene vapor phase dryer 4.

Claims

1. A temperature measurement system for the drying process of an oil-immersed transformer body, characterized in that: The device includes a kerosene vapor phase dryer (4), a temperature measuring fiber (6), a fiber optic connector (8), a fiber optic connector (9), a transmission fiber (11), and a temperature measuring host (7). The transformer body is located in the kerosene vapor phase dryer (4). The kerosene vapor phase dryer (4) has a fiber optic connector (8) on its furnace wall and a fiber optic connector (9) on its connector. One end of the fiber optic connector (9) has an inner interface (903) that connects to the tail end of the temperature measuring fiber (6), and the other end has an outer interface (901) that connects to the head end of the transmission fiber (11). The middle part of the fiber optic connector (9) has a threaded section (902) that connects to the threaded connection of the fiber optic connector (8). The temperature measuring element at the head end of the temperature measuring fiber (6) is located on the transformer body, and the tail end of the transmission fiber (11) is connected to the temperature measuring host (7).

2. The temperature measurement system for the drying process of an oil-immersed transformer body according to claim 1, characterized in that: The kerosene vapor phase dryer (4) has an installation sleeve (401) on its furnace wall, and the fiber optic connector (8) is sealed and fixed to the outer end face of the installation sleeve (401).

3. The temperature measurement system for the drying process of an oil-immersed transformer body according to claim 2, characterized in that: The inner end of the mounting sleeve (401) is provided with an inner flange (4011) which is sealed and fixed to the inner side of the furnace wall of the kerosene vapor phase dryer (4).

4. The temperature measurement system for the drying process of an oil-immersed transformer body according to claim 2, characterized in that: The fiber optic connector (8) is fixed to the outer end face of the mounting sleeve (401) by fixing bolts (10), and a first sealing element is provided between the fiber optic connector (8) and the outer end face of the mounting sleeve (401).

5. The temperature measurement system for the drying process of an oil-immersed transformer body according to claim 1, characterized in that: The threaded section (902) is tapered on the side of the fine end near the inner interface (903), and the fiber optic connector (8) is provided with a tapered threaded hole that mates with the threaded section (902).

6. The temperature measurement system for the drying process of an oil-immersed transformer body according to claim 1, characterized in that: The fiber optic connector (9) is provided with a limiting nut (904) that abuts against the outer surface of the fiber optic connector (8), and a second sealing element is provided between the limiting nut (904) and the outer surface of the fiber optic connector (8).

7. The temperature measurement system for the drying process of an oil-immersed transformer body according to claim 1, characterized in that: Both the inner interface (903) and the outer interface (901) are provided with locking holes (905) for the insertion of locking elements.

8. The temperature measurement system for the drying process of an oil-immersed transformer body according to claim 1, characterized in that: The fiber optic connector (9) has a through hole inside that connects the inner interface (903) and the outer interface (901).

9. The temperature measurement system for the drying process of an oil-immersed transformer body according to claim 1, characterized in that: Temperature measuring elements are provided on the transformer core (1), inner coil (2), and outer coil (3) of the transformer body.

10. The temperature measurement system for the drying process of an oil-immersed transformer body according to claim 1, characterized in that: The kerosene vapor phase dryer (4) is equipped with a transformer support (5), and the transformer body is fixed on the transformer support (5).

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