by Hugh Hoagland
September 30, 2009
On May 23, 2009 a power plant in the Midwest experienced a severe arc flash incident. The incident occurred while racking in a closed Siemens 15 kV GMI breaker with a faulty interlock. When the (closed) breaker contacted the bus, a large arc flash occurred. The breaker was being racked in remotely (wireless), the operators...