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Question
`What is OLTC in a transformer, specify its fuction.`
Question Submitted By :: Vijay0611
I also faced this Question!!     Rank Answer Posted By

Re: What is OLTC in a transformer, specify its fuction.
# 21
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
of transformer.

 Is This Answer Correct ? 0 Yes 1 No

Re: What is OLTC in a transformer, specify its fuction.
# 22
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.
Eg: VL=VHx(NL/NH)
V=P/I

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
I :&#8594;&#8734;
V :&#8594;0
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

 Is This Answer Correct ? 0 Yes 0 No
Hin Sothea(ctl)

Re: What is OLTC in a transformer, specify its fuction.
# 23
OLTC is an On Load Tap changing of transformer. which is
keep the voltage(Secondary side) within the Limitation as
per the Load variation by changing the Tap of transformer at
Primary side

 Is This Answer Correct ? 2 Yes 1 No
Murali

Re: What is OLTC in a transformer, specify its fuction.
# 24
ALL ANS. ARE CORRECT, BUT I WAN TO KNOW THAT WHERE IN THE DISTRIBUTION SYSTEM STEP-UP TRANSFORMER R USED! SO THE OUTPUT SIDE IS NOT HV BUT LV..
 Is This Answer Correct ? 0 Yes 1 No
Puneet

Re: What is OLTC in a transformer, specify its fuction.
# 25
OLTC MEANS ON LOAD TAP CHANGING TRANSFORMER
THERE IS ANOTHER TERM OCTC MEANS OFF CIRCUIT TAP CHANGING
TRANSFORMER
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
rajneesh.gca.mmmec@gmail.com

 Is This Answer Correct ? 1 Yes 2 No

Re: What is OLTC in a transformer, specify its fuction.
# 26
O.L.T.C IS NOTHING BUT A SWITCH WHICH CAN BE OPERATE DURING THE TRANSFORMER IS RUNNING AT ANY LOAD WITH OUT ANY PROBLEM.IT FACILITATE THE OUT WILL BE FIXED WHETHER THE INPUT IS VARIABLE
 Is This Answer Correct ? 0 Yes 0 No
Pinaki Chatterjee

Re: What is OLTC in a transformer, specify its fuction.
# 27
OLTC is nothing but Voltage Regulator, as the function of
voltage regulator is to give constant output irrespective of
the input voltage fluctuations.

 Is This Answer Correct ? 0 Yes 1 No
Srikanth

Re: What is OLTC in a transformer, specify its fuction.
# 28
oltc is on load tap changer. it is typical winding
connecton for a resistor type high speed oltc provided at
the neutral end of eaach phase of windings of a star
connected 3-phase transformer.

 Is This Answer Correct ? 0 Yes 1 No
Manoj Kumar

Re: What is OLTC in a transformer, specify its fuction.
# 29
3 is correct
 Is This Answer Correct ? 0 Yes 1 No
Sreejith

Re: What is OLTC in a transformer, specify its fuction.
# 30
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.

 Is This Answer Correct ? 1 Yes 0 No
Raj

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