What is the major difference between P.T. & C.V.T ? Why CVT
is used in HT Transmission line in place of P.T.?
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Answer Posted / ahamad kutty k.v.
For voltages from 11 kV to 132kV electromagnetic voltage
transformers or P.Ts are used commonly.But above 132kV for
electromagnetic VTs/PTs the insulation is a problem and
uneconomical compared to CVTs .so for higher voltages CVTs
are used.Also for low voltages the Electromagnetic voltage
transformers are not bulky and hence are used directly to
step down to lower values,say 110V used for protection and
metering.
In the case of CVTs capacitors in series are used to drop
down the voltages( not stepping down) the voltage i.e.like
a voltage divider from higher voltages to a manageable
value that can be transformed using 11kV or 33kV
P.T.connected to the lower tapping of the capacitor of the
CVT. The lower part of the CVT you will find an
electrmagnetic transformer. That part is used to transform
say lower primary voltage to 110V. If 132kV or higher
voltages were to be transformed directly to 110V then
the voltage transformer or P.T will be so bulky
and costly. CVTs if connected with a wave trap and PLCC
equipments the same shall be used for carrie communications
also.
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