基于分布式光纤测温的干式空心电抗器温升监测方法的研究

摘要

干式空心电抗器是电力系统中主要的辅助设备之一,其烧损事故时有发生.文中基于传热学和流体力学理论,利用流体-温度场耦合仿真分析了电抗器温度场分布,由温度场分布可知当出现过热故障时,故障点上部风道口的温度会明显高于相邻风道口的温度,在此基础上,提出了一种基于分布式光纤的干式空心电抗器温升监测方法.同时,为保证对干式空心电抗器故障部位的精确定位,提出了分布式光纤的环状式布局方式,故障部位定位精度可达±1个风道口.本文还通过实验验证了该测温方法的有效性和可靠性.%The dry-type air-core reactor is one of the main auxiliary equipment in power system,and the burning accident sometimes occurred.This paper used the coupling of flow field and temperature field to build the mathematical model which was based on heat transfer and fluid mechanics theory.The temperature of the point of failure on the upper crossing will be significantly higher than the temperature of the adjacent wind crossing when dry-type air-core reactor's overheating fault occurred.On this basis,a kind of dry-type air-core reactor temperature monitoring method based on distributed optical fiber was proposed.At the same time,in order to improve the accurate positioning of dry-type air-core reactor fault location,the circular layout of distributed optical fiber was put forward,and the fault location accuracy can be ±1 duct.At last,the experimental results verify the effectiveness and reliability of the temperature measurement method.