Answer Posted / shonali

there is no CW and CCW synchronization it depends on the
speed difference

synchronization is connecting our generator to grid by
matching with the grid frequency.
a synchroscope is used if our generator speed is less than
grid speed (frequency) the synchroscope rotates counter
clock wise (lag).
if our speed is high the scope needle rotates CW (lead)
if it is equal the needle stops

please I wont know how to calculate the vector group for power transformer ZNyn11 best regard.

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