Q1A) Discuss the fundamental requirements of protective relaying.? B) Derive the equation for torque developed in a disc of induction type electromagnetic relay.
Q1A) Discuss the fundamental requirements of protective relaying.? B) Derive the equation for torque developed in a disc of induction type electromagnetic relay.
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Transcribed Image Text:Q1 A) Discuss the fundamental requirements of protective relaying.?
B) Derive the equation for torque developed in a disc of induction type
electromagnetic relay.
Q2) Actual operating time of an induction type over current relay is 0.9 sec., the fault
current 4 KA and C.T. ratio is 400/5.
a) Find the current setting, if the time multiplier setting is 0.3.
b) Find the plug setting multiplier of the over current relay if the fault current 2000A,
current setting 50%,and CT. ratio 400/5.
c) Draw a curve between time of operation and plug setting multiplier for TMS 0.5.
Fig. below shows the curve between time of operation and plug setting multiplier of a
typical relay.
12
10
8
Operating time (Seconds)
4
9
2
0 2 4 6 8 10 12 14 16 18 20
P.S.M.->
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