Capabilities required of ac high voltage circuit breakers intended to protect generator circuits, may be very different from the capabilities required for standard high voltage circuit breakers, intended for service protecting standard distribution circuits which are specified in other industry standards. [Here we refer to C37.04, C37.06 , C37.09, and C37.010 as well as IEC 62271-100.] The purpose of this document is to provide standard requirements, tests and application guidelines for ac high-voltage generator circuit breakers.This standard applies to ac high-voltage (rated above 1000 V) generator circuit breakers which are typically installed between the generator and the step-up transformer terminals. Requirements relative to ac high voltage generator circuit breakers intended for use with generators and transformers rated 10 MVA or more are covered specifically. Generator circuits rated less than 10 MVA and pumped storage installations are considered special applications, and their requirements may not be completely covered by this standard. This standard does not cover requirements for ac high voltage distribution circuit breakers.
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