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 Operating time (Seconds)- 4 8 6 2 0 2 4 6 8 10 12 14 16 18 20 P.S.M.->
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 Operating time (Seconds)- 4 8 6 2 0 2 4 6 8 10 12 14 16 18 20 P.S.M.->
Chapter14: Phase Failure Relays
Section: Chapter Questions
Problem 1SQ: What is the purpose of phase failure relays?
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Transcribed Image Text: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
Operating time (Seconds)-
4
8
6
2
0
2
4
6 8 10 12 14 16 18 20
P.S.M.->
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