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* Generator control breaker 2 (GCB 2).
General Description
Each breaker mechanism has a close and open coil. Both coils
operate on a single plunger core. When the breaker gets to the
commanded position, the control contacts open and remove
command power. A permanent magnet holds the plunger in the
actuated position.
The breakers have two types of contacts, primary and auxiliary.
The primary contacts carry power flow from the AC source to
the transfer buses.
Each breaker gets a signal (command) to open or close. The
signals for the GCBs and BTBs come from their respective
GCUs. The APB signals come from the AGCU. However, the
BPCU also sends breaker open and close signals through the
GCUs and the AGCU. The BPCU also monitors the position of
each breaker. See the breaker control functional description
page in this section for more information.
These are the functions of the auxiliary contacts:
* Control (open/close) of the breaker
* Position status information for the BPCU
* Bus power indication on the P5 panel.
Some auxiliary contacts are closed and some are open when
the breaker itself is in the closed position. The auxiliary contacts
then change position when the breaker goes to the open
position.
All breakers have the same part number.
Training Information Point
Each breaker has a placard that identifies it.
AC GENERATION - GENERATOR CONTROL BREAKERS, AUXILIARY POWER BREAKER, AND BUS TIE BREAKERS
EFFECTIVITY
GUN ALL 24-20-00
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AC GENERATION - GENERATOR CONTROL BREAKERS, AUXILIARY POWER BREAKER, AND BUS TIE BREAKERS
AC GENERATION - GENERATOR CONTROL BREAKERS, AUXILIARY POWER BREAKER, AND BUS TIE BREAKERS
EFFECTIVITY
GUN ALL 24-20-00
Page 57
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-111
Purpose
The differential protection current transformers (DPCTs) supply
electrical current information from a power source to the correct
control unit.
General Description
There are three DPCTs and one CT, one for each AC power
source. These are the DPCTs:
* IDG 1 (GEN 1 DPCT)
* IDG 2 (GEN 2 DPCT)
* APU starter-generator (APU GEN DPCT)
* External power (CT).
Power comes from the terminal stud through each DPCT hole to
the rigid bus bar assembly. The transformer coils sense current
by induction for each phase. This information goes to the control
unit for the power source.
The GCU and AGCU use current data for power regulation,
protection, and indication. The control unit opens the breaker if
current is not in limits. See the protection pages in this section
for more information.
The BPCU uses the current data for protection of the electrical
system. The BPCU removes electrical loads (load shed) or
removes all external power if current is not in limits. See the AC
electrical load distribution section for more information about
load shed. (SECTION 24-50)
Location
All DPCTs are in a rigid bus assembly at the aft side of each
power distribution panel (PDP). You must remove an access
panel at the forward end of the forward cargo compartment to
get access to the aft side of the PDPs. You must then remove
feeder wires and a cover to get access to the rigid bus
assembly.
These DPCTs are in the P91 power distribution panel 1:
* Generator 1 DPCT (GEN 1 DPCT)
* APU starter-generator DPCT (APU GEN DPCT).
This DPCT and CT are in the P92 power distribution panel 2:
* Generator 2 DPCT (GEN 2 DPCT)
* External power CT.
Each DPCT or CT is between the source and the source breaker
or contactor.
WARNING: REMOVE ELECTRICAL POWER BEFORE
REMOVAL OR INSTALLATION OF THE CURRENT
TRANSFORMERS IN THE POWER DISTRIBUTION
PANELS. HIGH VOLTAGES PRESENT CAN CAUSE
INJURY TO PERSONS.
AC GENERATION - DIFFERENTIAL PROTECTION CURRENT TRANSFORMER
EFFECTIVITY
GUN ALL 24-20-00
Page 58
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-113
AC GENERATION - DIFFERENTIAL PROTECTION CURRENT TRANSFORMER
AC GENERATION - DIFFERENTIAL PROTECTION CURRENT TRANSFORMER
EFFECTIVITY
GUN ALL 24-20-00
Page 59
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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