摘要
为了研究油纸绝缘气隙放电能量特性与产气规律的相关性,基于油纸绝缘气隙放电模型,利用恒压法进行了36 h的气隙放电发展特性试验。计算了不同放电时刻最大放电能量和平均放电能量的幅值,引入放电重复率并提出每秒平均放电能量这一新特征量,分析结果表明每秒平均放电能量能够很好地表征局部放电的放电发展特性。另一方面,提取H_2、CH_4、C_2H_6、C_2H_4、C_2H_2和CO作为变压器油中溶解特征气体,对这6种特征气体的体积分数与每秒平均放电能量的相关性进行分析,结果表明:在油纸绝缘气隙放电过程中H_2的体积分数与每秒平均放电能量的相关性最高,其次为CO和CH_4,用这3种气体体积分数的变化可以大致反映出每秒平均放电能量的变化规律。
In order to study correlation between discharge energy characteristic and gas producing regularity in oil-paper air- gap insulation, the experiment on air-gap discharge development characteristic was performed by using constant voltage method for about 36 hours based on the model for air-gap discharge in oil-paper insulation. Amplitudes of maximum dis-charge energy and average discharge energy at different discharge time were calculated, repetitive rate of discharge was in-troduced and a new characteristic quantity called average discharge energy per second was presented which was proved to be able to well represent discharge development characteristic of partial discharge. On the other hand, H2, CH4, C2 , C2 H4, C2 H2 and CO was extracted as oil dissolved characteristic gas for the transformer and correlation between volume fraction of these six kinds of gas and average discharge energy per second was analyzed. Analysis results indicate correlation between volume fraction of H2 and average discharge energy per second is the highest in the process of air-gap discharge in oil-paper insulation and secondly high is CO and CH4. Thus, changes of volume fraction of these three gas can roughly reflect change law of average discharge energy per second.
出处
《广东电力》
2017年第7期83-88,共6页
Guangdong Electric Power
基金
中国南方电网有限责任公司重大科技专项(KJ-2014-170-3)
关键词
油纸绝缘
气隙放电
每秒平均放电能量
相关性
oil-paper insulation
air-gap discharge
average discharge energy per second
correlation analysis
