Marine Online
Completion this chapter the student
should appreciate the need for the
different instruments and switch gears
normally found on main switch boards and
have the necessary theoretical knowledge
to operate the main switchboard the main
switchboard is probably the most obvious
element the electrical power plant the
main switchboard is the main control
center for the electrical power plant in
addition to the monitoring control and
protection equipment for the generator
sets the NSB D supplies power to motor
group starter boards section boards and
distribution boards let's have a closer
look at the instrumentation and control
equipment on a typical switchboard click
on the switchboard section for a better
look
point and click on the DG sections and
the synchronizing sections to have a
look inside for details about the
generator breaker the protection devices
point and click on the breaker symbol
move the cursor over the object for
descriptions for details about the
generator break point and click DG one
is running and connected to the main bus
spa start DG to select the generator to
be synchronized by means of selector
switch the frequency and voltage should
be adjusted if necessary
press the in button and a synchro scope
within the five to twelve position while
the adjusting of frequency of voltage is
not very demanding on personnel the
parallel connection of two generators
requires trained personnel to help
personnel do to perform a parallel
connection a semi-auto synchronizing
device is often included this is a
parallel connection relay also called
check synchronizer which gives a connect
signal to the main breaker when voltage
frequency and phase for the incoming
generator are within preset limits dg1
is running and connected to the main bus
bar start DG to select the generator to
be synchronized by means of the selector
switch press the corresponding button
for semi-auto synchronization if
necessary adjust the frequency and
voltage until the ready lamp is lit the
ready lamp indicates whether or not the
voltage and frequency are within
acceptable limits for connection
In button if the circuit breaker does
not connect you may have to tweak the
frequency refer to the synchro scope to
determine what adjustments are necessary
for more details see the chapter on
synchronizing generators in the
following pages