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Question
What is OLTC in a transformer, specify its fuction.
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 21
on load tap changer.only used for voltage level increasing
or decreasing in secondary side for transformer side.for
exp:customer need 430v transformer primery side 11kv
 
Is This Answer Correct ?    0 Yes 0 No
Shanmuganathan
 
Answer
# 22
It seems most answers are ommiting the essential
function/characteristic(ON LOAD).I have a vague idea may be
someone will add.
It is my understating that with this tap changer you can
change winding tap position without breaking/swithing off
the load.This is achieved by the MAKE BEFORE BREAK
mechanism in the tap switch.
Hope someone will add.
 
Is This Answer Correct ?    0 Yes 0 No
Lbbs
 
Answer
# 23
low loss transformer with OLTC how many % losses? 
Is This Answer Correct ?    0 Yes 0 No
Kamlesh
 
Answer
# 24
Dear Dnyaneshwar, Please mote that 1)In HV transformers the LV winding is nearer to core and the HV winding is away from Core There fore it is easy for taking the taps .2) The current in HV being lower the switching current in OLTC is low.
Please note. 3)The RTCC means the Remote Tap Change Control Cubical This is installed in Control Room so that the Taps of the Transformer which is installed in Switch Yard can be changed from the Control room only. 4)The RTCC if provided with AVRCR then the taps are changed automatically by sensing the LV voltage. The AVRCR means AUTOMATIC VOLTAGE CORRECTION RELAY. 5) In bigger transformers say Voltage class 220 KV and above the OLTC tap connections are provided on LV side due to the insulation levels of high voltages at the switch.
 
Is This Answer Correct ?    0 Yes 0 No
Raj Lahare
 
Answer
# 25
OLTC is using for cntrolling transformer output voltage 
Is This Answer Correct ?    3 Yes 4 No
Savi
 
Answer
# 26
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
Sanjivani Mhaske
 
Answer
# 27
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
 
Answer
# 28
OLTC is nothing but Voltage Regulator, as the function of
voltage regulator is to give constant output irrespective of
the input voltage fluctuations.



OVER LOAD TAP CHANGER
 
Is This Answer Correct ?    0 Yes 1 No
Srikanth
 
Answer
# 29
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
 
Answer
# 30
3 is correct 
Is This Answer Correct ?    0 Yes 1 No
Sreejith
 

 
 
 
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