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1. What is differential relay? How it operates?
2.How to calculate the Short Circuit Impedance in
Transformer?
3.What is the alternate solution for testing of polarity by
using polarity
tester while its milli ammeter does not works?
4. While testing the 33KV Busbar by using Hipot kit, what
should be the test
voltage we have to apply?
5. What is the procedure/activities to be taken to inject
the current more than
2000A by using 2000A Loading Transformer?
6. Explain how you can give the overload setting to any
Motor Protection
Relay for a HT motors with formula and example?
7. Why restricted earth fault protection is needed? Why
can’t differential
Protection is sufficient?
8. What should be the minimum and maximum ohmic value for
earthing?
9. Why DC Currents are not used in transformer?
10. What is the Frequency while we step up the voltage from
220V to
11KV? Is it possible? Explain it?
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