UNIT IV

Static and Digital Relaying

Q1) What is static relay? Explain block diagram of static relay.

Q2) What are the merits and demerits of static relays?

Q3) Explain block diagram of Numerical relay.

Q4) Explain application of sampling theorem and anti- aliasing filter.

Q5) Explain least square method for estimation of phasor.

Q6) Explain block diagram of PMU.

Q7) What are the causes of overvoltage?

Q8) Explain lighting phenomenon.

Q9) Explain Direct & Indirect stroke.

Q10) Explain following Lighting Arrester

    i) Rod gap type             ii) Horn gap type            

 iii) Metal oxide type     iv) Thyrite type