Relay engineers have had to rely on many sources to compile information on
ct application. Typically, they have drawn on relay application and transfo
rmer textbooks, manufacturer publications, and standards. Recognizing the n
eed for a comprehensive one source document, the Power System Relaying Comm
ittee has produced the C37.110-1996 Guide for the Application of Current Tr
ansformers Used for Protective Relay Purposes.