Research of Insulation Aging of Transformer Insulation Paper by Multi-Parameter Regression Analysis

Abstract

In this paper two types of oil-paper samples are thermally aged in two temperatures of 120. The samples are constituted by 25# oil, 45# oil and paper. Some aging indicators are measured during the aging process. Three parameters are measured during the aging process. The insulating ability of paper can be evaluated by water content and CO2/CO value. The model of functional relation for degree of polymerization (DP) with CO2/CO value, water content and service period are established by multiple linear regression analysis.

Investigating Aging Characteristics of Oil-Immersed Power Transformers’ Insulation in Electrical–Thermal–Mechanical Combined Conditions

“…Reference [12] found that mechanical-thermal coupled aging has a more significant effect on the degradation of insulating paper mechanical properties compared to thermal aging, and the more intense the mechanical vibration, the more significant the decrease in the degree of polymerization and tensile strength of insulating paper. Reference [13] conducted mechanical-electrical-thermal aging tests with experimentally given conditions and obtained an empirical model for the variation in tensile strength of insulating paper under the combined action of heating, electrical, and mechanical forces.…”