Session on the measurement of dielectric properties at elevated temperatures, introduction

This session is concerned with the measurement of dielectric properties of electrical insulation at temperatures which are elevated above the normal room ambient temperature. The three papers which follow will discuss techniques utilized to measure specific properties. We shall now define the properties, discuss the reason why it is desirable to perform measurement at elevated temperature, review the activities of the American Society for Testing and Materials (ASTM) in this field, and examine the need for this session.