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to 66 KVA at 41,000 feet (12,496 meters).
The AC power system has these characteristics:
* Normal range of 107.5 - 117v (V) root mean square (RMS) per
phase, and 109 - 117 VRMS for three-phase
* Nominal steady-state voltage of 115 VRMS
* Non-normal operation of 97 - 132 VRMS per phase, and 98.5 -
130 VRMS for three-phase
* Steady-state frequency of 400 +5 Hertz (Hz), with a nominal
value of 400 Hz
* Non-normal frequency of 380 - 420 Hz.
Outside of these values, protection circuits in the generator
control units (GCUs), and the BPCU open the related generator
breaker to protect the source and the electrical system. Circuit
breakers give initial protection for individual buses or loads.
Control
The BPCU and GCUs control and protect the electrical system.
The GCUs control and monitor power quality. With flight
compartment switch position input and good power, the GCU
supplies a signal to close the breaker.
The GCUs and BPCU communicate with each other. The BPCU
monitors breaker positions for the electrical system. The BPCU
does not let a GCU send a close signal to a breaker until no
other power source is on that side.
The BPCU works with the GCUs to control bus tie-breaker (BTB)
position.
AC GENERATION - DISTRIBUTION AND AUTOMATIC CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 24-20-00
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The BPCU also controls power to the main buses and galleys. If
power requirements are too high, the BPCU opens the galley
and main bus load shed relays. The fail-safe design lets the
system operate with the failure of the BPCU or a GCU.
The start converter unit (SCU) controls the APU generator
voltage. The AGCU operates with the SCU to keep good APU
generator power. The AGCU monitors power quality. Poor
quality APU electric power causes the AGCU to open the APU
power breaker (APB).
AC GENERATION - DISTRIBUTION AND AUTOMATIC CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 24-20-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-001
AC GENERATION - DISTRIBUTION AND AUTOMATIC CONTROL - GENERAL DESCRIPTION
AC GENERATION - DISTRIBUTION AND AUTOMATIC CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
GUN 013-015, 111-114, 201-999 24-20-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-001
AC GENERATION - DISTRIBUTION AND AUTOMATIC CONTROL - GENERAL DESCRIPTION
AC GENERATION - DISTRIBUTION AND AUTOMATIC CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
GUN 001-012, 016-099, 101-110, 115 24-20-00
Page 10
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-001
Flight Compartment
The P5 forward overhead panel contains these three subpanels
(modules) which have the controls and indications for
the electrical power system:
* P5-13 electrical meters, battery and galley power module
* P5-5 generator drive and standby power module
* P5-4 AC system, generator and APU module.
P5-13 Electrical Meters, Battery and Galley Power Module
The battery switch controls relays that supply battery power to
the DC buses and the standby buses.
See the DC generation system section for more information.
(SECTION 24-31)
The alphanumeric display shows up to two lines of maintenance
information.
The AC meter selector is a seven-position rotary switch. The AC
meter selector selects the AC channel to show the AC VOLTS,
AC AMPS and CPS FREQ sections of the alphanumeric display.
Selection of GEN1, APU GEN, or GEN2 tells the display to show
voltage, current and frequency. Selection of STBY PWR, GRD
PWR, or INV makes the display show voltage and frequency.
You use the TEST position of the AC meter selector when you
do P5-13 BITE. See the electrical power section for more
information about BITE. (SECTION 24-00)
AIRPLANES WITH THE GALLEY SWITCH;
* The GALLEY switch supplies AC electrical power to galleys
when the AC transfer buses have power.
AIRPLANES WITH THE CAB/UTIL AND IFE/PASS SEATS
SWITCHES;
* The CAB/UTIL switch supplies electrical power to galleys
and numerous utilities.
* The IFE/PASS SEATS switch supplies electrical power to
　
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