m e m s a clearwater, fl september 5, 2002 mining electrical maintenance and safety association
TRANSCRIPT
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 VOLTSGENERATOR
# 1GENERATOR
# 2
OVERHEAD LINE # 1
OVERHEAD LINE # 2
4160 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
KVARKVA
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
+ KVARProducing
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