1. (a) What is a Vector grouping?
(b) How does the knowledge of vector grouping assist in connecting transformers to operate in parallel?
(c) What additional information is needed to ensure that transformers arecapable of parallel operation?
(d) What are the only phase displacements in degrees with which it ispossible to parallel the secondaries of two transformers?
(e) Draw the phase relationships and connections for(i) Dd0 connection(ii) Yy6 connection.
