Linearization Methods for NTC Temperature Sensors in Power Transmission Lines

This study proposes a linearization method for NTC (Negative Temperature Coefficient) temperature sensors used in power transmission lines. In modern power systems, transmission lines are crucial for power transmission, and monitoring their temperature is essential for ensuring the safety, stability, and efficiency of the power system. NTC temperature sensors are widely used for this purpose due to their high accuracy and sensitivity. However, the nonlinear characteristics of NTC temperature sensors pose challenges in practical applications. This paper will analyze the nonlinear response of NTC temperature sensors in detail and propose an efficient and accurate hardware linearization solution. This method uses different circuit combinations to match the high-precision temperature measurement requirements over a wide temperature range. Compared to other existing linearization methods, this approach requires less calibration work, has a simple circuit design, and imposes low computational demands on the controller. Experimental verification and data analysis demonstrate the reliability and accuracy of this method, highlighting its significance for the safe operation and equipment monitoring of power systems. The experimental results show that the NTC resistance with different B values has a linear relationship with the output voltage, and the output voltage is directly proportional to the temperature.