EE 412_ParallelOperation.pdf - 1 2 3 4 Continuity of...

Why connect generators
in parallel?
1)
Continuity of service


Sample Diagram
Two (2) shunt generators
connected in parallel.

Method of Solution
1)
Graphical method –if
the external
characteristics are
given (kW-rating,
voltage rating,
regulation,etc.)
2)
Circuit analysis –if the
internal
characteristics are
given(Eg,resistances,e
tc.)


Sample Problem
1)
Two shunt generators A & B operate in parallel
and their load characteristic may be taken as
straight line. The voltage of generator A falls
from 240V at no load to 220V at 200A, while
that of B falls from 245V at no-load to 220V at
150A. Determine the current supplied by each
machine to a common load of 300 A and the
common bus bar voltage
Ans.

