Answer Posted / naresh

In 400kV switchtard CVT is used for Voltage mesuring
(Protection & Metering purpose) and supply for wave trap.

wave trap is used for distence protection and communication
between sub stations.

For distence protection of line:
By using of wave trap triping time is less compare to relay
triping time.

What should be the length of transmission line so that we can see/obtain the full sine wave of voltage??

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