Patent ID: 8493012
Filing Date: 2013-07-23
Classification: H02H

Abstract:
1. A protection relay for an electrical switching apparatus for a load, said protection relay comprising: a number of voltage sensors structured to sense voltage applied to said load; a number of current sensors structured to sense current flowing to said load; a processor cooperating with said number of voltage sensors and said number of current sensors, said processor being structured to control starting of said load and determine a fault current available at said load from: (i) the sensed current flowing to said load during said starting divided by (ii) a difference value divided by the sensed voltage before said starting, said difference value being the sensed voltage before said starting minus the sensed voltage during said starting; and an output cooperating with said processor, said output being structured to output the determined fault current and a number of: incident energy at said electrical switching apparatus, and a personal protective equipment level operatively associated with said electrical switching apparatus, wherein said processor is structured to determine from the determined fault current said number of: the incident energy at said electrical switching apparatus, and the personal protective equipment level operatively associated with said electrical switching apparatus.