Characteristics of acid value in vegetable insulating oil during thermal aging

Author

Zhengjiang Wang ; Jian Li ; Lijun Yang ; Ruijin Liao

Author_Institution

Sch. of Electr. Eng., Chongqing Univ., Chongqing, China

fYear

2014

fDate

8-11 Sept. 2014

Firstpage

1

Lastpage

4

Abstract

Acid value is an important indicator used to evaluate the quality of insulating oil. The paper presents the characteristics of acid value in vegetable insulating oil during thermal aging. The individual experiments of hydrolysis and oxidation of vegetable oil were conducted for furthermore analysis to the origin of acidic products in vegetable oil. The quality requirement of acid value which is suitable for vegetable oil was also proposed. The experimental results show that the acidic products in aged vegetable oil mainly come from the hydrolysis of vegetable oil. It is suggested that we must pay enough attention when the acidity of vegetable insulating oil reaches to 2.4 mg KOH/g, because it means the moisture accumulation in insulating paper is already reach 2%.

Keywords

ageing; insulation testing; moisture; oxidation; paper; power transformer insulation; transformer oil; vegetable oils; KOH; acid value; acidic products; hydrolysis; insulating paper; moisture accumulation; oxidation; thermal aging; vegetable insulating oil; Gold;

fLanguage

English

Publisher

ieee

Conference_Titel

High Voltage Engineering and Application (ICHVE), 2014 International Conference on

Conference_Location

Poznan

Type

conf

DOI

10.1109/ICHVE.2014.7035398

Filename

7035398