基于TVOC检测的干式空心电抗器过热故障诊断方法  

Diagnostic Method of Dry-type Air-core Reactors Overheating Fault Based on Monitoring TVOC

作　　者：王梓 刘溟 邹建明 周文俊[1] 郑德龙 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]国家电网公司华中分部,武汉430077 [3]武汉慧测电力科技有限公司,武汉430073

出　　处：《高电压技术》2017年第11期3756-3762,共7页High Voltage Engineering

摘　　要：对运行中的干式空心电抗器进行监(检)测,可以避免其起火烧损。为克服现有几种监(检)测电抗器运行状态方法的局限性,通过试验找出干式空心电抗器绝缘材料双酚A型环氧树脂在过热条件下产生的特征气体总挥发性有机物(TVOC)。通过设计干式空心电抗器过热故障模拟试验,研究了TVOC体积分数随过热温度、过热时间、风速、相对湿度改变时的变化规律。试验结果表明:TVOC体积分数随过热温度增高而增加,当过热温度超过160℃时,TVOC体积分数高于2×10^(–8);且TVOC体积分数值受风速影响较大,呈负相关性。同时计算了TVOC的有效产气速率,考虑了风速对测量数据的影响,并拟合出过热温度的求解式。通过模拟试验验证,证明了该过热温度求解式能较准确的求解出电抗器包封内部的过热温度,进而判断干式空心电抗器的过热状态。Monitoring or detecting the dry-type air-core reactor in operation can avoid the fire accident. To solve the lim- itations of existing monitoring or detecting methods of the reactor operating condition, the characteristic gases total volatile organic compounds（TVOC） was found out by experiments of overheating dry-type air-core reactor insulation materials, such as bisphenol A epoxy resin. By designing dry-type air-core reactor overheating fault simulation test, the variation rules of TVOC volume fraction with the overheating temperature, overheating time, wind velocity and relative humidity were analyzed and researched. The test results show that the volume fraction of TVOC will increases with high- er overheating temperature, and it is higher than 2~ 10-8 when the overheating temperature is over 160 ~C. TVOC volume fraction is greatly influenced by wind speed, which is in a negative correlation. The effective gas generation rate was also calculated. In addition, the formula for solving overheating temperature was fitted out by considering the influence of wind velocity on the measurement data. Through the simulation test, it is proved that the overheating temperature calcu- lating formula can calculate the reactor temperature of the inside coating, and the overheating condition of the dry-type air-core reactor can be judged.

关 键 词：干式空心电抗器 过热故障 双酚A型环氧树脂 特征气体 TVOC 过热温度求解 

分 类 号：TM47[电气工程—电器]