7- What is the Dissipation Factor and the difference
between it and Insulation Resistance Test?
8- What is the task (function) of DC and AC reactors in
power plant?
9- What is the task (function) of (open delta with
earthed) in some types in transformers?
10- What is the base of the selection of the vector group
in transformers?
11- What is the zig-zag transformer and its function by
drawing in large detail?
12- What is the polarity ?
13- Why we make short between phase(R) in high side and
phase (r) in low side in vector group test?
Where High Side ( R ,S and T ) and Low Side (
r ,s and t ).
14- What are the time on delay and time off delay?
15- What is the vector group?
15- What is the task (function) of different types of
vector group such as Dyn11 , Dd0 , YNd1,……..,?
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