Dry-type transformer high-voltage winding with temperature measuring function

Abstract

The utility model provides a dry-type transformer high-voltage winding with a temperature measuring function. The dry-type transformer high-voltage winding comprises an annular high-voltage winding body and an optical fiber sensor provided with a plurality of temperature measuring points. The high-voltage winding body comprises a high-voltage coil and an insulating layer arranged outside the high-voltage coil; a temperature measuring groove is formed in the inner surface and / or the outer surface of the insulating layer; the optical fiber sensor is arranged in the temperature measurement groove, and one end of the optical fiber sensor extends out of the temperature measurement groove to be connected with the temperature measurement receiving module; insulation filling materials are arranged in the temperature measuring groove so as to position and fix the optical fiber sensor. According to the high-voltage winding, temperature detection can be achieved, safety performance is improved, high-temperature aging is reduced, the service life is prolonged, the optical fiber sensor is easy and convenient to install, effective positioning, fixing and protecting are achieved, damage and breakage are avoided, and reliability and effectiveness of temperature measurement can be improved.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, and more specifically, to a high-voltage winding of a dry-type transformer with temperature measurement. Background Technology

[0002] Dry-type transformers are transformers that do not use liquid cooling media (such as oil). Due to their advantages such as simple structure, convenient maintenance, and good fire resistance, dry-type transformers are widely used in places with high requirements for safety and reliability, such as urban power grids, high-rise buildings, subways, airports, and hospitals.

[0003] During operation, dry-type transformers generate heat in their windings and core due to the flow of current. Excessive temperature can lead to aging of the insulation materials and shorten the transformer's lifespan. Therefore, real-time temperature monitoring of dry-type transformers is crucial for ensuring their safe operation. Temperature monitoring of the high-voltage winding is particularly important, as its high voltage level results in greater heat generation. Excessive temperature accelerates the aging of the high-voltage winding insulation materials, reducing its insulation performance and increasing the risk of breakdown. Faults in the high-voltage winding can lead to complete transformer damage and even trigger power grid accidents, causing severe economic losses and social impact.

[0004] Fiber optic temperature measurement technology is an ideal method for transformer temperature monitoring due to its strong resistance to electromagnetic interference, high measurement accuracy, and fast response speed. However, its application in dry-type transformers still faces some challenges: the slender shape of fiber optic sensors makes them susceptible to damage or breakage during installation or use, leading to temperature detection failure. Furthermore, the high-voltage windings are encased in insulating material after fabrication, making disassembly for repair and replacement difficult; therefore, ensuring the fiber optic sensors are not damaged during installation is crucial. Thus, a technical solution for applying fiber optic sensors to high-voltage windings needs to be designed to simplify installation and prevent damage during the process. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies in the existing technology and provide a high-voltage winding of a dry-type transformer with temperature measurement. This high-voltage winding can realize temperature detection, improve safety performance, reduce high-temperature aging, and extend service life. The fiber optic sensor is simple and convenient to install, and is effectively positioned, fixed and protected to avoid damage and breakage, thereby improving the reliability and effectiveness of temperature measurement.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a high-voltage winding of a dry-type transformer with temperature measurement, comprising a ring-shaped high-voltage winding body and an optical fiber sensor with several temperature measurement points; the high-voltage winding body includes a high-voltage coil and an insulating layer disposed outside the high-voltage coil; a temperature measurement groove is formed on the inner surface and / or outer surface of the insulating layer; the optical fiber sensor is disposed in the temperature measurement groove, and one end of the optical fiber sensor extends outside the temperature measurement groove to connect with a temperature receiving module; the temperature measurement groove is provided with insulating filler to position and fix the optical fiber sensor.

[0007] This invention embeds a fiber optic sensor in a temperature measuring groove within the insulation layer of a high-voltage winding. The sensor detects the temperature at multiple locations on the high-voltage winding insulation layer through measuring points on the fiber optic sensor, thereby obtaining the overall temperature of the high-voltage winding. Subsequently, an external temperature receiving module receives the temperature data acquired by the fiber optic sensor, enabling real-time temperature detection, improving the safety performance of the high-voltage winding, reducing high-temperature aging, and extending its service life.

[0008] The fiber optic sensor is embedded in a temperature measuring groove. The insulating filler material positions and fixes the sensor, providing protection and preventing displacement or breakage of the fiber optic cable within the high-voltage winding, thus improving the reliability and effectiveness of temperature measurement. During manufacturing, the insulating layer with the temperature measuring groove can be directly cast using a mold during insulation casting. After placing the fiber optic sensor in the temperature measuring groove, the insulating filler material is filled in. The installation of the fiber optic sensor is simple and convenient. Furthermore, when replacement or repair of the fiber optic sensor is required, the insulating filler material can be removed from the temperature measuring groove. After replacement or repair, new insulating filler material can be filled in, facilitating the replacement and repair of the fiber optic sensor.

[0009] Preferably, there is one or more temperature measuring slots; the number of fiber optic sensors matches the number of temperature measuring slots; each temperature measuring slot is opened along the height direction of the high-voltage winding body.

[0010] The fiber optic sensor is installed in the temperature measuring tank, that is, arranged along the height direction of the high-voltage winding body, which can obtain the temperature at different height positions of the high-voltage winding, forming a reasonable detection layout for the high-voltage winding. The temperature measuring tank is easy to manufacture; vertical protrusions can be set in the mold, which facilitates demolding and reduces the difficulty of the process.

[0011] Preferably, each temperature measuring groove extends to the top and bottom of the high-voltage winding body at both ends.

[0012] Preferably, there are two or more temperature measuring grooves; each temperature measuring groove is evenly distributed on the inner surface of the insulation layer.

[0013] Preferably, the depth of the temperature measuring tank is: the diameter of the fiber optic sensor × (1.2 to 3 times); the width of the temperature measuring tank is: the diameter of the fiber optic sensor × (2 to 5 times).

[0014] The depth and width of the temperature measuring groove can not only embed the fiber optic sensor and fill it with sufficient insulating filler to position, fix and protect the fiber optic sensor, but also reduce the impact of the temperature measuring groove on the overall shape of the high-voltage winding and the insulation performance of the high-voltage winding.

[0015] Preferably, there are two or more fiber optic sensors; each fiber optic sensor is connected to a temperature receiving module.

[0016] Preferably, the insulating layer comprises an insulating cloth and an insulating pad sequentially bonded to the inner surface of the high-voltage coil, and an insulating casting layer formed on the outside of the high-voltage coil, the insulating cloth, and the insulating pad by casting. This insulating layer can effectively meet the insulation performance requirements of the high-voltage winding.

[0017] Preferably, the insulating wrapping layer refers to an epoxy resin insulating wrapping layer.

[0018] Preferably, the insulating filler refers to an insulating filler formed by filling a room-temperature insulating material into a temperature measuring tank and solidifying it.

[0019] Preferably, the front end of the high-voltage winding body is provided with a wiring surface for connecting to the high-voltage coil.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] 1. This utility model can detect the temperature at multiple locations of the high-voltage winding insulation layer, thereby obtaining the overall temperature of the high-voltage winding, realizing real-time temperature detection, improving the safety performance of the high-voltage winding, reducing high-temperature aging, and extending service life.

[0022] 2. This utility model allows for simple and convenient installation of the fiber optic sensor, avoiding damage and breakage during installation; the fiber optic sensor can be effectively positioned and fixed in the insulation layer and protected in the insulating filler, which can improve the reliability and effectiveness of temperature measurement; and it can realize the replacement and maintenance of the fiber optic sensor.

[0023] 3. The temperature measuring groove of the insulating layer in this utility model is easy to manufacture and has low process difficulty. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the high-voltage winding of the dry-type transformer with temperature measurement according to this utility model;

[0025] Figure 2 yes Figure 1 Enlarged view of section A in the middle;

[0026] Figure 3 This is a cross-sectional schematic diagram of the high-voltage winding of the dry-type transformer with temperature measurement according to this utility model.

[0027] Figure 4 This is a schematic diagram of the structure of the high-voltage winding body of the dry-type transformer with temperature measurement according to this utility model.

[0028] Figure 5 yes Figure 4 Enlarged view of section B in the middle;

[0029] Among them, 1 is the high-voltage winding body, 2 is the insulating filler, 3 is the fiber optic sensor, 4 is the wiring surface, and 5 is the temperature measuring groove. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] like Figures 1 to 5 As shown in the figure, this embodiment of a dry-type transformer high-voltage winding with temperature measurement includes a ring-shaped high-voltage winding body 1 and an optical fiber sensor 3 with a plurality of temperature measurement points. In this embodiment, each optical fiber sensor 3 has ten temperature measurement points; in practical applications, the number of temperature measurement points for each optical fiber sensor can also be other, such as 1, 2, 3, etc., which can be set according to the temperature measurement requirements.

[0033] The high-voltage winding body 1 includes a high-voltage coil and an insulating layer disposed outside the high-voltage coil; the front end of the high-voltage winding body 1 is provided with a wiring surface 4 for wiring with the high-voltage coil. Temperature measuring grooves 5 are formed on the inner and / or outer surfaces of the insulating layer. An optical fiber sensor 3 is disposed in the temperature measuring groove 5, and one end of the optical fiber sensor 3 extends outside the temperature measuring groove 5 to connect with a temperature receiving module; insulating filler 2 is provided in the temperature measuring groove 5 to position and fix the optical fiber sensor 3.

[0034] This invention embeds an optical fiber sensor 3 in a temperature measuring groove 5 within the insulation layer of a high-voltage winding. The sensor 3 detects the temperature at multiple locations within the insulation layer of the high-voltage winding through its measuring points, thereby obtaining the overall temperature of the high-voltage winding. Subsequently, an external temperature receiving module receives the temperature data acquired by the optical fiber sensor 3, enabling real-time temperature detection, improving the safety performance of the high-voltage winding, reducing high-temperature aging, and extending its service life.

[0035] The fiber optic sensor 3 is embedded in the temperature measuring groove 5. The insulating filler 2 can position and fix the fiber optic sensor 3 and play a protective role, preventing the fiber from shifting and breaking in the high-voltage winding, thus improving the reliability and effectiveness of temperature measurement. During manufacturing, the insulating layer with the temperature measuring groove 5 can be directly cast using a mold during insulation casting. After the fiber optic sensor 3 is placed in the temperature measuring groove 5, the insulating filler 2 is filled into the temperature measuring groove 5. The installation of the fiber optic sensor 3 is simple and convenient.

[0036] In this embodiment, the temperature measuring groove is formed on the inner surface of the annular insulating layer; in practical applications, the temperature measuring groove can also be formed on the outer surface of the annular insulating layer, or simultaneously on both the inner and outer surfaces of the annular insulating layer. Since the inner surface of the high-voltage winding is close to the low-voltage winding and has a higher temperature rise, detecting the temperature inside the high-voltage winding better meets the urgent need for temperature measurement. In this embodiment, there are two or more temperature measuring grooves 5, evenly distributed; in practical applications, the number of temperature measuring grooves can also be other, such as 1, 3, etc., which can be set according to the temperature measurement requirements. The number of fiber optic sensors 3 matches the number of temperature measuring grooves 5; each temperature measuring groove 5 is formed along the height direction of the high-voltage winding body 1. The two ends of each temperature measuring groove 5 preferably extend to the top and bottom of the high-voltage winding body 1, respectively. The fiber optic sensors 3 are set in the temperature measuring grooves 5, that is, arranged along the height direction of the high-voltage winding body 1, which can obtain the temperature at different height positions of the high-voltage winding, forming a reasonable detection layout for the high-voltage winding. The temperature measuring grooves 5 are easy to manufacture; vertical protrusions can be set in the mold, which facilitates demolding and reduces the difficulty of the process.

[0037] The depth of the temperature measuring tank 5 is: the diameter of the fiber optic sensor × (1.2 to 3 times); the width of the temperature measuring tank 5 is: the diameter of the fiber optic sensor × (2 to 5 times).

[0038] The depth and width of the temperature measuring groove 5 can not only embed the fiber optic sensor 3 and fill it with sufficient insulating filler 2 to position, fix and protect the fiber optic sensor 3, but also reduce the impact of the temperature measuring groove 5 on the overall shape of the high voltage winding and reduce the impact on the insulation performance of the high voltage winding.

[0039] The insulation layer includes insulating cloth and insulating pad sequentially bonded to the inner wall of the high-voltage coil, and an insulating resin-bonded layer formed on the outside of the high-voltage coil, insulating cloth, and insulating pad by casting. This insulation layer effectively meets the insulation performance requirements of the high-voltage winding. The insulating resin-bonded layer refers to an epoxy resin insulating resin-bonded layer.

[0040] Insulating filler refers to insulating filler formed by filling a temperature measuring tank with room-temperature insulating material and allowing it to solidify. The room-temperature insulating material can be a mixture of resin and silica powder. When the fiber optic sensor 3 needs to be replaced or repaired, the insulating filler can be removed from the temperature measuring tank. After the fiber optic sensor is replaced or repaired, new insulating material is filled in to form a new insulating filler, thus enabling the replacement and repair of the fiber optic sensor.

[0041] Example 2

[0042] This embodiment discloses a high-voltage winding of a dry-type transformer with temperature measurement, comprising a ring-shaped high-voltage winding body and an optical fiber sensor with several temperature measurement points; the high-voltage winding body includes a high-voltage coil and an insulating layer disposed outside the high-voltage coil; a temperature measurement groove is formed on the inner and / or outer surface of the insulating layer; the optical fiber sensor is disposed in the temperature measurement groove, and one end of the optical fiber sensor extends outside the temperature measurement groove to connect with a temperature receiving module; the temperature measurement groove is provided with insulating filler to position and fix the optical fiber sensor.

[0043] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A dry-type transformer high-voltage winding with temperature measurement, characterized in that: The high-voltage winding body includes a high-voltage coil and an insulation layer arranged outside the high-voltage coil; an inner surface and / or an outer surface of the insulation layer is / are provided with a temperature measurement groove; the optical fiber sensor is arranged in the temperature measurement groove, and one end of the optical fiber sensor extends out of the temperature measurement groove to be connected with a temperature measurement receiving module; the temperature measurement groove is provided with an insulation filler to position and fix the optical fiber sensor.

2. Dry-type transformer high-voltage winding with temperature measurement according to claim 1, characterized in that: The temperature measurement groove is one or more; the number of the optical fiber sensors matches the number of the temperature measurement grooves; each temperature measurement groove is arranged along a height direction of the high-voltage winding body.

3. Dry-type transformer high-voltage winding with temperature measurement according to claim 2, characterized in that: Two ends of each temperature measurement groove extend to a top and a bottom of the high-voltage winding body, respectively.

4. Dry-type transformer high-voltage winding with temperature measurement according to claim 2, characterized in that: The temperature measurement groove is two or more; each temperature measurement groove is uniformly arranged on the inner surface of the insulation layer.

5. Dry-type transformer high-voltage winding with temperature measurement according to claim 1, characterized in that: A groove depth of the temperature measurement groove is a fiber sensor diameter multiplied by (1.2 times to 3 times); a width of the temperature measurement groove is the fiber sensor diameter multiplied by (2 times to 5 times).

6. Dry-type transformer high-voltage winding with temperature measurement according to claim 1, characterized in that: The optical fiber sensor is two or more; each optical fiber sensor is connected with the temperature measurement receiving module.

7. Dry-type transformer high-voltage winding with temperature measurement according to any of claims 1 to 6, characterized in that The insulation layer includes an insulation cloth and an insulation pad sequentially attached to an inner surface of the high-voltage coil, and an insulation pouring layer formed outside the high-voltage coil, the insulation cloth and the insulation pad by pouring.

8. Dry-type transformer high-voltage winding with temperature measurement according to claim 7, characterized in that The insulation pouring layer is an epoxy insulation pouring layer.

9. Dry-type transformer high-voltage winding with temperature measurement according to any of claims 1 to 6, characterized in that: The insulation filler is an insulation filler formed by filling a normal-temperature insulation material into the temperature measurement groove and solidifying.

10. Dry-type transformer high-voltage winding with temperature measurement according to any of claims 1 to 6, characterized in that: A front end of the high-voltage winding body is provided with a wiring surface for wiring with the high-voltage coil.

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