학술논문
Behavior of ester dielectric fluids near the pour point
Document Type
Conference
Author
Source
1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Electrical insulation and dielectric phenomena Electrical Insulation and Dielectric Phenomena, 1999 Annual Report Conference on. 2:459-462 vol.2 1999
Subject
Language
Abstract
The pour points of dielectric fluids based on natural esters are not reliable indicators of their fluidity at cold temperatures. A 25-day isothermal test was used to determine the time to solidification of several natural ester fluids and a synthetic ester at -15/spl deg/C. The results are compared to ASTM D97 pour point measurements. Natural ester dielectric fluid properties measured before and after a 120 hour freeze/thaw cycle showed no changes occurred due to solidification. Finally, the performance of both a solidified natural ester and a high fire point high molecular weight hydrocarbon was compared to that of conventional mineral oil by energizing at full rated load transformers held at an ambient temperature of -30/spl deg/C.