OLTC is On load Tap Changer to maintain constant voltage at
secondary side according to change in load. Tappings are
provided on HV winding as this winding is outer on the core.
So less insulation will be required. By changing taps on HV
side, we can monitor voltage at secondary side. Basically,
this tapping is provided on HV side because there is high
fluctuation of voltage on HV side (i.e. from supply
company). Tap changing process is done by RTCC (i.e. Remote
Tap Changer Controller). This is installed in HT panel of
transformer. RTCC sends signal to LCP (local control panel)
which is in turn motor rotates it rotor as per signal
received from RTCC. It is generally used for higher capacity
OLTC On Load Tap Changer in Tr. Is mean that the changing
Tap of Transformer is according to the changing of loads
at low voltage side. Any way chang Tap mean chang the turn
winding of Primary side of Tr.
If current at lower side is increased, the voltage at lower
side will be decreased and also for the voltage at higher
side.To make the voltage at lower side stable, the turn
winding at higher side must be higher than it befor. When
the turn is chang it is mean the Tap is chang.
By Ohm Law:
P : Stable
VL :constant,Low side Voltage(We need it be constang)
VH :constant,High side Voltage
NL :constant,Low side turn winding
NH :High side turn winding
OLTC MEANS ON LOAD TAP CHANGING TRANSFORMER
THERE IS ANOTHER TERM OCTC MEANS OFF CIRCUIT TAP CHANGING
OLTC IS IS MORE USEFUL THAN OCTC
IT IS MAINLY USE TO CONTROL VOLTAGE DU TO REACTIVE POWER
THERE IS MECHANICAL DRIVER WHICH CHANGE NO OF TURN IN
SECONDARY AND IT IS AUTOMATIC CONTROL
if u dont agree please contact 7398114807 or inform
OLTC MEANS ON LOAD TAP CHANGER
THE FUNCTION OF OLTC IS TO CHANGE THE VOLTAGE LEVEL OF THE
SECONDARY SIDE OF THE TRANSFORMER ACCORDING TO CHANGE IN
LOAD SIDE TO MAINTAIN THE CONSTANT VOLTAGE WITHIN THE LIMITS
AND ALSO ITS A SAFETY DEVICE.
i am swathi, b.tech 4th year.
In smps(switched mode power supply)we are using
diodes,mosfets,igbts for controling of current.
And my question is why we did not use thyristors(scr)? it
is also act as a switch,then what is the drawback of scr as
compared to above transisters> if we use the scr,then what
is happening ? plz give reply as soon as possible bcoz i
am doing project on smps. plz frnds i want ans for
that. if anybody know the ans plz send to my e-mail
IN A SMALL D.C GENERATOR, IF WE REPLACE THE LAMINATED
CORE ARMATURE WITH A WOODEN BLOCK OF SAME SIZE & SHAPE
AND WIND WIRES WOUND ON THE SLOTS OF WOODEN ARMATURE AND
CONNECTED TO THE COMMUTATOR.COMMUTATOR IS FITTED WITH BRUSH
TO RECEIVE INDUCED E.M.F.WHETHER E.M.F GENERATED OR NOT?