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21. What is the purpose of taking Capacitance and Tan Delta
Test in
Transformer bushing?
22. What are the protections to be used for Generator?
23. Draw the vector diagram and condition for the
following: 1) Dyn1
2) Ynd0 3) YnYn0
24. What happens when the polarity changes in CT? Explain
briefly?
25. Explain the Term in CT Name Plate – Class: 5P10
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Answer Posted / raul
-it is done for insulation testing i.e. to measure the loss
angle.........
-merz price circulating current scheme (i.e. differential
protection), balanced earth fault protection, protection
against unbalanced loading which leads to negative sequence
currents........
-not possible to draw in this format........
-no change will occur if the polarity is changed bcoz it is
independent of the polarity
-class 5 and VA rating is : 10
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