Q1
Phase Rotation
Engineering
drawing may be isometric (three dimensional view) or orthographic (mostly two
views of two dimensions). Orthographic drawing has basic two views of plan and
elevation. It is represented in two styles.
First
angle projection style wherein elevation comes above the base line and plan
below it.
Third
angle projection style wherein plan comes above the base line and elevation
below it.
The
style is indicated in drawing by symbol. Default style is third angle
projection.
Similarly in electrical
engineering also can have two styles for presentation of vector diagram.
It may be either
clockwise vector rotation or anticlockwise vector rotation.
One of this is
most popular and followed.
Phase sequence RYB
of three phases is presented as shown in the vector diagram.
Decide the
direction of the phase vector rotation.
clockwise or anticlockwise?
Answer
Readers,
Quiz is a mental exercise to enhance reasoning power in the subject. Hence personal attempt for reply is expected before jumping to answer. Answer given here is just for confirmation.
Proceed
Phase Sequence RYB means phase Y follows phase R and phase B follows phase Y and so on. In other words, phase Y is behind the phase R. As in the diagram, this is possible when phase rotation in anticlockwise.