Impulse-failure-detection methods as applied to distribution transformers

Investigation of several methods for the detection of impulse failures in distribution transformers has strengthened our belief in the inadequacy of the methods described in American Standard C57.2. All of the methods are discussed in detail, and the most hopeful one is compared with the present method of analyzing the voltage wave and making the physical observations as outlined in the Standards. Data are presented on transformers utilizing present and proposed methods.