Progress in revision of IEEE/ANSI C50 series of standards for large steam and combustion turbine generators and harmonization with the IEC 60034 series

A working group of the IEEE PES Electrical Machinery Committee has completed the task of comparing the American National Standards Institute (ANSI) standards for electrical machinery with the corresponding International Electrotechnical Commission (IEC) standards. For the synchronous generator standards, a summary of this work was presented. at a panel session in Berlin, Germany in July, 1997. In association with this initiative, a second working group was commissioned by the Synchronous Machinery Sub-Committee of the IEEE PES Electrical Machinery Committee to revise the IEEE/ANSI C50 series of standards. This SMSC Working Group No. 4 (Revision of C50.1X Series) reported initial progress at a panel session in New York in February, 1999(2). The working group is now refining its current draft of a revised C50.13 standard for steam and combustion turbine generators before submitting a final version for balloting by the IEEE RES Electric Machinery Committee and the ANSI C50 Committee. As part of those final steps, the working group has prepared this paper to publicize some highlights of refinements added since 1999 to modernize the C50 standards for large synchronous electrical machines.