M E M S A

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M E M S A
Mining Electrical Maintenance and Safety
Association

• CLEARWATER, FL
• September 5, 2002

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FULLY AUTOMATIC BACKUP GENERATOR SYSTEM

• Larry Casson
• Drummond Co. Inc.

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METHODS OF APPLYING POWER GENERATORS

• 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.
• 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).

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GENERATOR 1
GENERATOR 2
34,500 VOLTS
4160 VOLTS
OVERHEAD LINE 1
OVERHEAD LINE 2
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POWER IN KW
UNLOADING TRAIN WITH DUAL CAR DUMPER AND
POSITIONING CARS WITH A TRAIN CAR INDEXER
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MANUAL SWITCH TO GENERATORS
MANUAL SWITCH TO INCOMING POWER
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BASICS
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POWER TRIANGLE
KVA
KVAR
Included angle
KW
PF COS of included angle KW/KVA
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POWER TRIANGLE
Base loading
KVAR
Voltage regulator
KW
Throttle
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4 POWER QUADANTS
KVAR
REVERSE POWER PROTECTION REQUIRED
KVAR Producing
KW
- KW
-KVAR Absorbing
- KVAR
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UNDERGROUND 14,400 VOLT SYSTEM
ONE GENERATOR RUNNING
KW
KVAR
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WHY USE GENERATORS

• BACKUP POWER SYSTEM
• REDUCE POWER SYSTEM LOADING
• HELP STABILIZE VOLTAGE