Title :
The Influence of Organic Acid on Thermal Aging of Power Transformer Oil-paper Insulation
Author :
Cui Yunguang ; Wu Guangning ; Wang Xiaojian ; Peng Qian ; Chen Ling ; Gao Bo
Author_Institution :
Sch. of Electr. Eng., Southwest Jiaotong Univ., Chengdu, China
Abstract :
To research the influence of one of the aging product (organic acid) of cellulose on oil-paper insulation, low molecular weight of the carboxylic acid (formic, acetic) and high molecular weight of the carboxylic acid (stearic) have been added to new electric insulating oil to arrive at a neutralization value of 0.3mgKOH/g, the initial moisture content in insulation paper have been controlled at 0.5% and 2.75%. The distribution characters of organic acid in oil-paper insulation and the influence of organic acid on thermal aging of oil-paper insulation at 70°C, 90°C and 110°C have been investigated. Experimental results show that formic and acetic could be easily absorbed by insulation paper while stearic could easily dissolve in electric insulating oil. There is no significant influence of temperature and initial moisture content on the distribution characters of organic acid in oil-paper insulation. Low molecular acid would work together with moisture to accelerate the aging speed of insulation paper.
Keywords :
ageing; molecular weight; organic compounds; paper; power transformer insulation; transformer oil; acetic acid; aging product; carboxylic acid; cellulose; electric insulating oil; formic acid; high molecular weight acid; initial moisture content; insulation paper; low molecular weight acid; neutralization value; organic acid; power transformer oil-paper insulation; stearic acid; temperature 110 C; temperature 70 C; temperature 90 C; thermal aging; Accelerated aging; Humidity; Insulation; Moisture; Power transformers; Temperature;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena (CEIDP), 2013 IEEE Conference on
Conference_Location :
Shenzhen
DOI :
10.1109/CEIDP.2013.6748119
