CHAPTER
24
Electrical Power
CHAPTER 24 Electrical Power
24-CONTENTS
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D633W101-BEJ
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ELECTRICAL POWER -INTRODUCTION
General * EEC -electronic engine control
* EEU -ELMS electronic unit The electrical power system makes, supplies, and controls * ELCU -electrical load control unit electrical power to the airplane. The system has these * ELMS -electrical load management system
* EMI -electro-magnetic interference subsystem:
*
EP -external power
*
EPC -external power contactor
* External power * ESDS -electro-static discharge sensitive * Generator drive system ETOPS -extended twin operations * AC generation * * FBW -fly by wire * ELMS * FCDC -flight controls dc * Distribution * FLT -flight * DC generation * FNC -fiber nickel cadmium
*
Indication.
*
F/O -first officer Abbreviations and Acronyms * GCB -generator circuit breaker
* GCR -generator control relay
*
AFDC -automatic flight director computer * GCU -generator control unit
*
AFDS -automatic flight director system * GEN -generator
*
APB -auxiliary power breaker * GH -ground handling
*
AUTO -automatic * GHR -ground handling relay
*
AVAIL -available * GND -ground
*
BAT -battery * GSSR -ground service select relay
*
BPCU -bus power control unit * GSTR -ground service transfer relay
*
BTB -bus tie breaker * HDLG -handling
*
BU -backup * IDG -integrated drive generator
*
CCB -converter circuit breaker * ILS -instrument landing system
*
CONV -converter * INST -instrument
*
CPT -captain * I/O -input/output
*
CPU -central processing unit * ISLN -isolation
*
CSD -constant speed drive * LRM -line replaceable module
*
CTRL -control * LRU -line replaceable unit
*
DISC -disconnect * PEPC -primary external power contactor
*
EDIU -engine data interface unit
EFFECTIVITY
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ELECTRICAL POWER -INTRODUCTION
*
PFC -primary flight computer
*
PMG -permanent magnet generator
*
POR -point of regulation
*
PRI -primary
*
PSA -power supply assembly
*
PSU -power supply unit
*
PWR -power
*
QAD -quick attach/detach
*
RAT -ram air turbine
*
RLY -relay
*
SCM -signal conditioning module
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SEC -secondary
*
SEPC -secondary external power contactor
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STBY -standby
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SVC -service
*
TBB -transfer bus breaker
*
TRU -transformer rectifier unit
*
UB -utility bus
*
UTIL -utility
*
XFR -transfer
EFFECTIVITY BEJ ALL 24-00-00
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777 AIRCRAFT MAINTENANCE MANUAL
ELECTRICAL POWER -INTRODUCTION
EFFECTIVITY BEJ ALL 24-00-00
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777 AIRCRAFT MAINTENANCE MANUAL
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ELECTRICAL POWER -GENERAL DESCRIPTION -POWER & CONTROL
Power Sources
The electrical power system has five main power sources, two backup power sources, and two standby power sources. These are the main power sources and their continuous supply capacity:
*
Left integrated drive generator (IDG) (120 kva)
*
Right IDG (120 kva)
*
APU generator (120 kva)
*
Primary external power (90 kva)
*
Secondary external power (90 kva).
The backup power sources are the two backup generators. Each backup generator can continuously supply 20 kva. The standby power sources are the ram air turbine (RAT) generator and the main battery. The RAT generator can continuously supply 7.5 kva. The battery is a 47 amp-hour battery.
Control
These six electronic units control the ac power sources:
*
Left generator control unit (GCU) -left IDG power
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Right GCU -right IDG power
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Backup generator converter -backup generator power
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APU GCU -APU generator power
*
Bus power control unit (BPCU) -external power
*
RAT GCU -RAT generator power.
The electrical load management system (ELMS) controls the main battery power.
EFFECTIVITY
BEJ ALL
ELMS
All airplane electrical power goes through the ELMS panels for distribution. The ELMS panels contain the load-switching devices that distribute this power. The ELMS also controls most of the devices. These are the ELMS panels:
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