Determination of temperature of electrical apparatus and cables in service

Temperature measurements constitute a large part of the work of the test department of an electric light and power company in the acceptance and maintenance of the electrical equipment. The methods of measuring temperature which are applicable to this work are discussed in this article. The characteristics of the different kinds of temperature measuring apparatus are brought out by describing a number of actual tests. In the article considerable attention has been given to various forms of thermocouples which have been found very useful in obtaining temperature measurements on cables and in underground conduit systems.