flat full tutorial demonstrating the
thyristor three-phase AC power control
when LV DAC is fully open left click on
the thyristor control application here
to open it
then under function selection
select the function you want from the
list by clicking on it
now let's take a look at the settings of
this function
load configuration this setting allows
you to choose between four different
configurations
three wires star three wires Delta 4
wire star and finally six wires Delta
control mode
this setting allows you to command the
thyristors in two different ways
phase control and burst fire control for
load configuration 4S and 6D and only in
Phase control for 3s and 3D
firing angle control
knob analog input 1 or its complement
firing angle shows you the current
firing angle of the thyristors
this setting is replaced by the period
in cycle and the on time also in cycle
when the control mode is switched to
burst fire
acceleration and deceleration time for
smoother command variation
q1 to q6 the thyristor is used in this
function
each one can be put active for Direct
Control by the function or on or off for
troubleshooting
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status indicates if the function is
started or not
here's the knob to control the firing
angle and finally the start stop button
to control the function
as always
here's the electrical diagram of the
function with the specific load
configuration selected
note that when you change the load
configuration a new diagram appears and
the image in the show connection button
here also changes to always help you
during your Hardware connection process
the thyristor three-phase AC power
control is a huge function
with four load configurations these
circuits can represent various systems
such as soft starters promoters
thyristor controlled reactors also known
as tcrs used in static VAR compensation
systems three-phase powered heating
systems and more
in this demonstration I'll show you the
3s and 6D load configurations only that
respectively represent a soft starter
and a TCR system
let's start with the 3s load
configuration what you see here in
yellow is the line voltage between lines
one and two and in blue the voltage at
the load T1
finally the purple curve is the signal
sent to q1
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as you see if I increase the firing
angle the output voltage decreases
imagine now that the load is an
induction motor
if I first set the firing angle to 180
degrees then start the application
nothing will happen
but if I slowly decrease the firing
angle the motor will slowly start
turning because of the increasing output
voltage
using the acceleration time here I can
put 10 seconds between 0 volts to
maximum voltage and the function will
automatically adjust the firing angle
over time to create a 10 seconds soft
starter
as you see it works perfectly now I stop
the application then choose 6D in the
load configuration setting
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a different electrical diagram appears
showing me the new circuit that I need
to connect
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when everything is correctly connected I
restart the application
this time the yellow curve is the input
voltage between lines one and two
the blue curve is the load voltage
between T2 and T3 and the purple curve
is the signal sent to q1
this circuit is a typical
thyristor-controlled reactor found in
static VAR compensation systems
depending on the power factor or the
line voltage of the network
you can adjust the firing angle which
caused the load a reactance to have a
different value
in fact you can easily absorb more or
less reactive power from the network
without using a synchronous compensator
try this load configuration on burst
fire control and also try the 3D and 4S
configurations to see their differences
and particulars
many Laboratories and tests can be
achieved with this function
try them all
that's it for the thyristor three-phase
AC power control
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