油浸式变压器温度场的可控发热模拟装置研究

Exploring Controllable Heating Analog Device of Oil-filled Transformer Temperature Field

通过研究油浸式电力变压器的热生成与热传导机理,研制了一种内部热源的可控发热变压器模拟装置。利用热电偶传感器对内部热源的变压器进行多点测温,并把内部热源变压器绕组温度数据与油浸式变压器绕组温度进行分析和比较。结果表明,研制的变压器在额定功率工作条件下,顶层油温81.7℃,底层油温57.7℃,顶层绕组88.5℃,底层绕组72.9℃,顶层油温及关键节点温度和大型油浸式电力变压器绕组温度基本吻合,额定功率下最大温度偏差为0.5℃,1.3倍额定功率下最大温度偏差为0.6℃。

Through the study of the heat generation and heat conduction mechanisms of oil-immersed transformer,a controllable heating analog device with internal heat source is developed.Its temperature is measured at several points with a thermocouple sensor.Then,the temperatures of the windings of the heating analog device with internal heat source and the oil-immersed transformer are analyzed and compared.The results show that the top oil temperature of the transformer at the rated power that was developed in the paper is 81.7℃;its bottom oil temperature is 57.7℃,its top winding temperature is 88.5℃,and its bottom winding temperature is 72.9℃.The top oil temperature and key nodal temperature are basically consistent with the temperature of the windings of the large oil-immersed power transformer.The maximum temperature deviation of the transformer at the rated power is 0.5℃,and its maximum temperature deviation at the 1.3 times rated power is 0.6℃.