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Distribution Of Moisture In Oil Immersed Pressboard Under Transient Temperature Condition

被引：0
|
作者：
Wang, Wei [1 ]
Ma, Zhiqing [1 ]
Wang, Xin [1 ]
Li, Chengrong [1 ]
Ma, Jixian [2 ]
Long, Kaihua [2 ]
Hao, Zhen [2 ]
Liu, Shaoyu [2 ]
Wu, Yanwei [2 ]
机构：
[1] North China Elect Power Univ, Beijing Key Lab HV & EMC, State Key Lab Alternate Elect Power Syst Renewabl, Beijing, Peoples R China
[2] North China Elect power Res Inst, High voltage Res Inst, Beijing, Peoples R China
来源：
PROCEEDINGS OF 2012 IEEE INTERNATIONAL CONFERENCE ON CONDITION MONITORING AND DIAGNOSIS (IEEE CMD 2012) | 2012年
关键词：
distribution; moisture; pressboard; transient temperature condition; INSULATION;
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Moisture has strong influence on insulation performance of oil pressboard system in power transformer. Moisture in oil immersed pressboard is uniform under constant temperature condition. Moisture in pressboard can be calculated according Oommen paper oil equilibrium curves. Temperature of power transformer is related to the atmospheric temperature and the load. If atmospheric temperature or load changed, oil and pressboard insulation will work under transient temperature condition. If temperature increased, moisture will move from the pressboard to the oil; if temperature decreased, moisture will move from the oil to the pressboard. In this case, the distribution of moisture in oil immersed pressboard is un-uniform. The un-uniform distribution of moisture can be ignored in very thin pressboard. However, it is important to understand the distribution in thick pressboard for assessment of insulation condition. In this paper, a test system has been set up which consists of programmable oven, Karl Fischer moisture meter and oil-pressboard samples. Transient condition of temperature decrease from 80 degrees C to 20 degrees C in 5 hours has been simulated. Moisture in various pressboards from 0.5mm to 5mm has been measured. The results have been presented and analyzed.
引用
收藏
页码：897 / 900
页数：4
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