基于压电传感的电缆接头界面压力测量研究

配网电缆接头冷缩管的界面压力是电缆接头绝缘强度和密闭性能的重要保障。目前研究中很少分析在界面压力测量中因薄膜传感器本身形变造成的误差。因此,该文首先优化压电薄膜传感器结构,减小压电材料形变产生的影响,然后根据实际形变量对弯曲力进行补偿,分别给出了结构优化与受力补偿的量化公式,并试制电缆接头界面压力测量装置。实验结果表明,在有补偿情况下测量的界面压强值与无补偿测量值相差11.5%,且误差随曲率半径的减小而增大,验证了压电薄膜传感器形变弯曲力补偿的必要性。

Study on Interface Pressure Measurement of Cable Connector Based on Piezoelectric Sensor

The interface pressure of the cold shrink tube of the distribution network cable joint is an important guarantee for the insulation strength and airtight performance of the cable joint. At present, there are few studies on the error caused by the deformation of thin film sensor itself in the measurement of interface pressure. First, the structure of the piezoelectric thin film sensor is optimized to reduce the influence of the deformation, and then the bending force is compensated according to the actual deformation. The quantitative formulas for structure optimization and force compensation are given respectively, and the experimental setup for measuring the interface pressure of the cable joint is fabricated. The experimental results show that the difference between the measured interface pressure value with compensation and that without compensation is 11.5%, and the error increases with the decrease of the radius of curvature, which verifies the necessity of compensation of the deformation and bending force of piezoelectric thin film sensor.