An experimental measurement device for thermal resistance between cakes of oil-immersed transformer windings based on distributed optical fiber temperature measurement and its application method
A technology of oil-immersed transformers and distributed optical fibers, applied in measuring devices, measuring heat, instruments, etc., can solve the problems of limiting transformers and difficult measurement of thermal resistance between winding cakes, and achieve the effect of ensuring reliability and avoiding influence
Active Publication Date: 2020-08-25
KUNMING UNIV OF SCI & TECH
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Problems solved by technology
At present, in the research on the distribution of hot spots in transformer windings, due to the fact that the oil-impregnated insulating paper is a poor conductor of heat and the transformer oil is affected by thermal convection, it is difficult to measure the thermal resistance between the winding cakes. At present, there is no effective measurement of the winding cake The method and device of thermal resistance greatly limit the research on the distribution of hot spots in transformer windings
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Embodiment 1
[0019] Embodiment 1: as figure 1 As shown, an experimental measurement device for thermal resistance between cakes of oil-immersed transformer windings based on distributed optical fiber temperature measurement, including heat dissipation plate 1, analog winding 2, distributed temperature measurement optical fiber 3, heat resistance plate 4, gasket 5, Thermal resistance wire 6, transformer oil 7, PC terminal 14, wire 15, bus 17, DTS demodulation system;
[0020] The simulated winding 2 is made of copper tubes wrapped with insulating paper discs. The simulated winding 2 is divided into upper and lower layers and placed in sequence to form a three-cake simulated winding. Each two-layer simulated winding 2 is separated by a gasket 5 and the gap in the middle Transformer oil 7 is filled in the middle, and a cooling plate 1 is placed on the top and bottom of the three-cake simulation winding. The thermal resistance wire 6 is introduced into the copper tube for heating, and the dis...
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The invention relates to an experimental measurement device for thermal resistance between cakes of oil-immersed transformer windings based on distributed optical fiber temperature measurement and its use method. The simulated windings are separated by gaskets and the gaps in the middle are filled with transformer oil. A cooling plate is placed on the top and bottom of the three-cake simulated winding. The copper tubes of the lower and middle windings in the winding are heated by thermal resistance wires, and the distributed temperature measurement optical fibers are introduced into the copper tubes of the three-cake simulation winding for temperature measurement. One end of the distributed temperature measurement optical fibers is connected to the DTS demodulation system and Through the DTS demodulation system, the collected signal is transmitted to the PC terminal connected to it through the bus. The invention measures and obtains the data of the thermal resistance between the winding cakes by means of experiments, and provides data support for the analysis of the hot spots of the transformer windings.
Description
technical field [0001] The invention relates to an experimental measurement device for thermal resistance between cakes of oil-immersed transformer windings based on distributed optical fiber temperature measurement and a method for using the same, belonging to the technical field of measurement and control. Background technique [0002] In the power transmission and distribution system, the overheating of the winding during the operation of the transformer will cause insulation aging, burning, breakdown and other accidents. Other physical and chemical changes inside the transformer (such as partial discharge and local overheating, etc.) will also cause changes in the temperature of the transformer, making the transformer behave differently from the temperature rise trajectory of normal operation. According to the "6°C rule", the relationship between the aging rate of the transformer and the temperature is based on the reference temperature. The aging rate doubles when the t...
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IPC IPC(8): G01K11/32G01K11/3206
CPCG01K11/32
Inventor 赵振刚时凯强李川李英娜万小容杨秀梅
Owner KUNMING UNIV OF SCI & TECH