Basic Transformer-Life Characteristics. Volume 1. Overload Characteristics and Life-Test Evaluation. Final Report

摘要

This report describes the results of experimental studies related to transformer survivability. It deals with the behavior of typical power transformer insulation systems during short-time exposure to elevated temperatures, and it provides some insight into failure mechanisms associated with gas bubble evolution within the insulation structure. Another important phase of the program involved the development and exploratory evaluation of a functional test program which may be used for determining the life expectancy characteristics of power transformers. Still another investigation resulted in the development and evaluation of an overload test procedure for power transformers. A feasibility study on a new type of thermal sensor for possible use as a winding hot spot sensor yielded promising results. The data presented is expected to be of help in developing improved transformer operating practices and in permitting an assessment of failure risks associated with particular service conditions. (ERA citation 07:056729)