©2015 Siemens Protection Devices Limited
Chapter 7 Page 7 of 64
Section 1: Introduction
The 7SR242 relay can be used to provide comprehensive protection for two winding or auto-transformers power
transformers. The relay can also be used to provide differential protection for motors and reactors etc.
Basic functionality includes overall differential protection and two restricted earth fault (REF) protections i.e. REF
protection for each transformer winding.
Optional current based and voltage based functionality can be used to provide integrated, comprehensive
transformer protection.
Summary of Contents for 7SR242 Duobias
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