基于有限积分技术的特高频局部放电传感器灵敏度仿真计算

Simulating Calculation of the Sensitivity of UHF Partial Discharge Sensors Based on Finite Integration Technique

近年来的技术研究和现场应用表明,特高频(ultra-high frequency,UHF)法是一种行之有效的电力设备局部放电检测方法。UHF传感器设计是UHF法应用过程中最重要的环节之一,传感器灵敏度决定了现场检测的有效性和可靠性。提出了一种基于有限积分技术(finite integration technique,FIT)评估传感器灵敏度的仿真方法,简化了传感器设计及校验过程。建立了无反射立方体模型来模拟灵敏度校验系统,能够在被测传感器的接收表面上方形成垂直极化的TEM波。通过比较单极传感器的仿真和理论灵敏度,验证了计算结果的可靠性。计算了外置式偶极UHF传感器的灵敏度,与实测结果一致,并且发现传感器灵敏度与TEM波的入射方向有关。

Technical research and field application in recent years has proved that the ultra-high frequency(UHF)method is an effective approach for partial discharge detection of power equipment.UHF sensor design is the most important link in the course of UHF application,for sensor sensitivity decides the effectiveness and reliability of field detection.A simulation method based on the finite integration technique(FIT)was proposed for sensor sensitivity evaluation,and sensor design and verification process was simplified.A reflection-free simplified cubic model was built to simulate the sensitivity verification system,where a vertically polarized TEM wave was generated above the receiving surface of the sensor under test.The reliability of the calculation results was verified through comparison with the simulation and theoretical sensitivities of the monopole sensor.The sensitivity of an external dipole UHF sensor was calculated and proved to be consistent to the result of actual measurement.Furthermore,the sensor sensitivity was found to be related with the incidence direction of the TEM wave.