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Answer Posted / narasiman kannan
A VT is a voltage transformer used for measurement &
protection purpose. It is small in capacity as compared to
power transformer. VT & CT are generally classified as
instrument transformers. A CVT is a Capacitor oltage
transformer which is associated with a stack of capacitor
voltage divider. As an example, if there are 2 stacks of
55KV capacitors in a CVT(connnected between one phase &
ground), the actual VT primary winding is connected across
the lower 55KV stack (lower stack to ground). By this, you
save the cost of primary winding & insulation. While a VT
has higher accuracy, CVT has less accuracy and high phase
angle error. CVTs are use for voltage measurement &
synchroniser supply and not for power relays & power
measurement where accuracy is important.
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