EE WAS TRYING TO SET UP POWER IN SUB-STATION AFTER RECENT POWER OUTAGE DUE TO ICE STORM. EE STATED THAT HE OPERATED THE MAIN POWER TRIP BUTTON TO DE-ENERGIZE THE SUBSTATION & WITH HIGH VOLTAGE GLOVES & A SAFETY GROUND CABLE TESTED THE MAIN CIRCUIT TO ENSURE POWER WAS DISCONNECTED. AN ELECTRIC ARCH OCCURRED DURING THIS TASK CAUSING 1ST & 2ND DEGREE BURNS TO THE FACE.