Answer / k.prakashchandra

similar to potential divider

Answer / 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.

We have a distribution transformer of 750KVA/11kv/440v and an AVR (Servo Stabilizer) of 750KVA on the LT side of distribution transformer. Also we have an ACB of 1200A on the output of distribution transformer (that is on the input of AVR). We want to have an MCCB on the output of AVR. What should be the rating?

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