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随着城市电网的发展,电力电缆使用量剧增,而电缆的工作状态受到其工作温度的影响,与电缆周围土壤热参数息息相关,因此有必要研制一种能够测量电缆周围土壤热参数的传感器以保证电缆的安全稳定运行。同时设计一种利用电感电容振荡(LC振荡)感应加热、PT100热电阻测温的空心球形传感器,相较于传统热探针能更好地考虑探头自热容和探头与土壤之间接触热阻的影响,最终通过Matlab非线性最小二乘拟合得出所测量土壤的热参数。
With the development of urban power grids, the use of power cables has increased dramatically. However, the working conditions of cables are affected by their working temperature and are closely related to the soil thermal parameters around the cables. Therefore, it is necessary to develop a sensor capable of measuring soil thermal parameters around the cables Ensure the safe and stable operation of the cable. At the same time, the design of a hollow inductive capacitance oscillation (LC oscillation) induction heating, PT100 thermal resistance temperature of the hollow spherical sensor, compared to the traditional thermal probe to better consider the probe heat capacity and the probe and the soil thermal contact resistance Finally, the thermal parameters of the measured soil are obtained by Matlab nonlinear least-squares fitting.