Jawaharlal Nehru Technological University Kakinada 2010-2nd Sem M.E Electrical & Electronics Engineering M.Tech II Sester Supplentary s Partial Discharge in HV Equipnt (EEE-Power Systems-HV) -

Subject Code: B5602
M.Tech II Semester Supplementary exams June 2010
Partial Discharge in HV Equipment
(EEE-Power Systems-HV)
Time: three Hours Max Marks: 60
ans any 5 ques. All ques. carry EQUAL marks


1. a) describe partial discharge. elaborate the kinds of partial discharges?
b) explain the inception of corona discharges in air and SF6.
2. discuss the recurrence of discharges when an insulating medium is subjected to an AC
voltage, DC voltage and impulse voltage for corona and surface discharges.
3. a) Draw the basic diagram of electrical discharge detection circuit and discuss it.
b) What is effect of sensitivity and resolution in discharge detection and mention the
important equations related to it.
4. a) define different kinds of calibrators used in partial discharge detectors.
b) explain the straight and Balanced detection methods.
5. explain the electrical and non-electrical methods for locating partial discharges in High
voltage equipment.
6. a) discuss the traveling wave technique for locating the partial discharges in cables and in
switch gear.
b) explain the various mechanism of deterioration of dielectric when partial discharges are
present
7. Bring out the techniques to detect PD in bushings and capacitors.
8. explain in detail the procedure adopted in detecting the partial discharges in transformers
and gas insulated switch gear.

Earning:   Approval pending.