7- What is the Dissipation Factor and the difference between it and Insulation

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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