M E M S A CLEARWATER, FL September 5, 2002 Mining Electrical Maintenance and Safety Association.

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M E M S A CLEARWATER, FL September 5, 2002 Mining Electrical Maintenance and Safety Association

FULLY AUTOMATIC BACKUP GENERATOR SYSTEM Larry Casson Drummond Co. Inc.

METHODS OF APPLYING POWER GENERATORS 1.STAND ALONE GENERATOR(S) One or more generators provide all the real power (KW) and reactive power (KVAR) required by the load. Paralleling generators require KW and KVAR sharing. 2.BASE LOADING One or more generators providing constant real output power (KW) and reactive power (KVAR). May be expressed as power (KW) and power factor (PF).

34,500 VOLTS GENERATOR # 1 GENERATOR # 2 OVERHEAD LINE # 1 OVERHEAD LINE # VOLTS

UNLOADING TRAIN WITH DUAL CAR DUMPER AND POSITIONING CARS WITH A TRAIN CAR INDEXER POWER IN KW

MANUAL SWITCH TO GENERATORS MANUAL SWITCH TO INCOMING POWER

BASICS

KW KVAR KVA POWER TRIANGLE PF = COS of included angle = KW/KVA Included angle

KW KVAR POWER TRIANGLE Base loading Throttle Voltage regulator

+ KW- KW + KVAR - KVAR 4 POWER QUADANTS + KVAR Producing REVERSE POWER PROTECTION REQUIRED -KVAR Absorbing

UNDERGROUND 14,400 VOLT SYSTEM KW KVAR ONE GENERATOR RUNNING

WHY USE GENERATORS BACKUP POWER SYSTEM REDUCE POWER SYSTEM LOADING HELP STABILIZE VOLTAGE