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Answer Posted / srikanth
OLTC(online/load tap changer)is typically used where we
have a variable voltage available on primary side
(11/22/33/66 kv etc.,).The reason behind using OLTC is to
ensure that a proper primary voltage is always
maintained.For example for a 11kv/433v installation which
is located in a industrial/rural area,the voltage on
primary side will never be 11kv.It keeps varying 10 or 9
(peak load time)during day time and may rise to 12,13
during night times(non peak load time).So by having a OLTC
we can raise or lower the volatge accordingly & try
maintaining 11kv/433v.
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