极寒条件下基于光传感的绝缘子污秽在线监测技术

摘要

目前常规的污秽在线监测系统只能在常温常压下正常工作.对于极寒地区,如我国东北和内蒙古东部冬季常出现-40 ℃以下的极端低温天气,将严重影响在线监测系统的正常运行.因此,研制了极寒条件下绝缘子污秽在线监测系统.首先,对比了目前主流污秽监测用传感器的优劣,并进行了低温试验,选择光学传感器进行污秽监测;随后,结合极寒条件下的特点,研究了盐密灰密测量技术、保温措施以及稳定供电技术,进行了极寒条件下绝缘子污秽在线监测系统研制;最后,进行了相关的试验和挂网运行研究,结果表明保温措施可行有效、稳定供电技术可以在极寒条件下正常运行、研制的设备可以稳定运行,盐密值和灰度值的测量准确度均在±10%范围以内.%Regular insulator contamination online monitoring systems can only work under normal pressure and temperature condition, which are not applicable for severe cold areas like northeast of China and east of Inner Mongolia with below-40 ℃ of extreme low temperature weather in winter.Hence, an insulator contamination online monitoring system for severe cold condition is developed in this paper.Firstly, the advantages and disadvantages of mainstream insulator contamination sensors are compared and severe cold experiment is carried out, then optical sensor is selected for contamination monitoring.Secondly, based on the characteristics of severe cold condition, measurement of salt and non-soluble deposit densities, insulation methods and stable power supply technology are studied, then an insulator contamination online monitoring system for severe cold condition is developed.Finally, relevant tests and operation research in grid are carried out to verify the performance of the system.The results show that insulation measures are feasible and stable power supply can effectively work in extreme low temperature, and the online monitoring system can work reliably under severe cold condition with ±10% detection accuracy of salt and non-soluble deposit densities.