摘要
油中糠醛含量是评估变压器绝缘纸老化的一种重要特征量,其在变压器油中的稳定性直接决定了评估结果的可靠性。为此探究了温度、铜和氧气3种因素对绝缘油中糠醛稳定性的影响：在实验室条件下配置一定糠醛质量浓度的绝缘油,并将其分别置于温度（90、110、130℃）、铜（有、无）、氧气（有、无）3个因素组合条件下,通过定期测量绝缘油中糠醛质量浓度来判断糠醛在不同条件下的稳定性情况。实验结果表明：单就温度而言,即使温度升高到130℃糠醛依然稳定,无铜无氧情况下,温度变化（≤130℃）不影响糠醛稳定性;铜对糠醛稳定性的影响随温度变化,在90℃下不影响糠醛稳定性,在110℃和130℃下均会使油中糠醛缓慢降解,130℃时的降解速率快于110℃,并且在50 d实验周期内下降了19%;氧气对糠醛稳定性的影响比较明显,糠醛在氧气存在环境下会降解,并且铜和高温均会加速该环境下糠醛的降解速率;高温、铜、氧气对糠醛稳定性的影响表现为一种协同作用,在其他2个条件不具备的情况下,单因素对绝缘油中糠醛质量浓度无影响或影响很小。
The furfural concentration in transformer oil is one of the most important characters to assess ageing condition of insulating paper, and its stability directly determines the reliability of the assessment results. We invetigated the effects of different factors（temperature, copper, and oxygen） on the stability of the furfural in insulating oil. We prepared insulating oil with a certain concentration of furfural, and periodically measured the furfural concentration of the insulating oil to test the stability in different conditions, namely, different temperatures（90, 110, 130 ℃）, copper（presence or absence）, and oxygen（（presence or absence）. The experimental results demonstrate that, firstly, as far as temperature is concerned, furfural remains stable even when the temperature is raised to 130 ℃, furfural is stable in the absence of copper or oxygen no matter how temperature changes. Secondly, the effect of copper on furfural stability varies with temperature. The stability of furfural is not affected by copper at 90 ℃, however, furfural slowly degrades at 110 ℃ and 130 ℃, and a more rapid degradation is observed at 130 ℃ with a proportion of 19% during 50-day-experiment. Thirdly, the effect of oxygen on the stability of furfural is obvious, and furfural degrades in an oxygen atmosphere. Furthermore, both copper and high temperature are able to accelerate this process. It is a synergistic effect on the stability of furfural among high temperature, copper, and oxygen. The single factor has no or little effect on the concentration of furfural in insulating oil in the absence of the other two factors.
作者
廖瑞金
冯大伟
李金忠
张书琦
赵志刚
LIAO Ruijin;FENG Dawei;LI Jinzhong;ZHANG Shuqi;ZHAO Zhigang(State Key Laboratory of Power Transmission Equipment ＆System Security and New Technology, Chongqing University, Chongqing 400030, China;China Electric Power Research Institute, Beijing 100195, China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2018年第6期1729-1734,共6页
High Voltage Engineering
基金
国家创新研究群体基金(51321063)
国家电网公司科技项目(SGTJ0000KXJS1400075)~~
关键词
变压器
糠醛
降解
稳定性
协同作用
transformer
furfural
degradation
stability
synergistic effect
