IEEE Std C37.09a™-2005(Amendment toIEEE Std C37.09™-1999) C37.09aTM IEEE Standard Test Procedure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis— Amendment 1: Capacitance Current Switching 3 Park Avenue, New York, NY10016-5997, USA IEEE Power Engineering Society Sponsored by the Switchgear Committee