Answer / g senthilkumaran

Scalar drive means only V/F control over the motor
torque can control by V/F mode

Vector control drives use a mathematical model of the motor
to dynamically determine the values of the essential
operating and control parameters. They are called "vector
control" drives because this analysis is based on a vector
representation of current, voltage and magnetic flux.

Vector drives continuously monitor and analyze the motor
current to determine what voltage to apply at any given
frequency to produce the optimum magnetizing current.

Vector drives provide excellent performance in terms of
accurate static and dynamic speed regulation and rapid
response to sudden changes in load torque

What is the need of earthing transformer for delta side of a transformer. (Think of a line section between a star/delta transformer at a grid substation and delta/star transformer at a village. An earthing transformer is there at the delta side of the star/delta transformer at grid substation). As there are no ground reference there will not be fault current if a one phase is grounded. Further L-L phase will be sensed by the primary side of star/delta transformer as a L-G fault. So why an earthing transformer is required at delta side

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