变压器油中溶解甲烷实时监测系统设计  

Design of Real-time Monitoring System for Dissolved Methane in Transformer Oil

作　　者：曹旺 万元 李橙橙 廖学顺 吴昊天 CAO Wang;WAN Yuan;LI Chengcheng;LIAO Xueshun;WU Haotian(Hydropower Industry Innovation Center of State Power Investment Co.,Ltd.,Changsha 410007,China;Hunan Wuling Power Technology Co.,Ltd.,Changsha 410007,China)

机构地区：[1]国家电力投资集团水电产业创新中心,湖南长沙410007 [2]湖南五凌电力科技有限公司,湖南长沙410007

出　　处：《电工技术》2023年第21期182-185,共4页Electric Engineering

摘　　要：针对变压器放电性故障的标志性气体——甲烷的在线监测需求,研制了一种基于可调谐半导体激光器技术的变压器油中溶解甲烷实时监测系统。系统搭建了中心波长为1563 nm的N型DFB激光器与光程长度为12 m的怀特池的光学检测模块,结合动态顶空脱气法设计了油气分离模块,研发了基于STM32与上位机的控制模块,实现了注油、脱气、测量、回油等功能,测量周期约为30 min。实验结果表明,二次谐波峰谷值与气体浓度具有极好的线性关系,线性拟合误差为0.999,系统的最小检测下限低于0.5μL/L,气相同浓度多次测试结果之间的误差控制在0.5%以内,测量精度与稳定性满足变压器的甲烷监测需要。Aiming at realizing on-line monitoring of methane,the landmark gas of transformer discharge fault,a real-time monitoring system of dissolved methane in transformer oil based on tunable laser diode absorption spectroscopy technology is developed.The system contains an optical detection module consisting of N-type DFB laser generator with central wavelength of 1563 nm and Whitepool with optical path length of 12 m,an oil and gas separation module designed using dynamic headspace degassing method,and a control module based on STM32 and upper computer,realizing functions of oil injection,degassing,measurement,and oil discharge with the measurement period of about 30 minutes.The experimental results show that there is an excellent linear relationship between peak and valley values of the second harmonic wave and the gas concentration.The linear fitting error is 0.999,the minimum detection limit of the system is less than 0.5μL/L,and the gaseous phase error between multiple test results of the same concentration is controlled within 0.5%,meeting the requirements of transformer methane monitoring for measuring accuracy and stability.

关 键 词：变压器 甲烷 可调谐半导体激光器技术 实时监测 

分 类 号：TN29[电子电信—物理电子学]