1
You visited us
1
times! Enjoying our articles?
Unlock Full Access!
Byju's Answer
Standard XII
Physics
Components
Instantaneous...
Question
Instantaneous relay should operate within
A
0.001 sec
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
0.0001sec
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
0.1 sec
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
0.01 sec
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution
The correct option is
D
0.01 sec
0.01 sec
Suggest Corrections
0
Similar questions
Q.
Frame relay operates in the ____________________.
Q.
An IDMT relay is used to protect feeder through 500/1 CT. The relay has a PSM 100% and TMS = 0.4, relay characteristics are given for TMS = 1.
PSM
2
3
5
8
10
12
Time (sec)
10
6
4.5
3.2
3
2.5
If the fault current is 5000 A, then time of operation of relay will be_______sec.
Q.
An electromechanical MHO relay has its operating torque and restraining torque governed by relation
T
o
=
a
V
I
c
o
s
(
ϕ
−
α
)
and
T
r
=
b
V
2
,
(
W
h
e
r
e
α
i
s
a
d
j
u
s
t
a
b
l
e
)
by varying resistance in phase shifting circuit. The condition on ratio a/b and admittance Y when this relay operates is
Q.
A transformer circuit breaker is equipped with 500/5 A C.T, connected to an induction type over current relays. The relays have 125% plug setting and 0.4 time setting. If a 3-
ϕ
fault current of 7500 A flows from C.T. and relays follow the characteristics table given below at TMS = 1, then actual operating time of the relay will be
PSM
4
8
12
16
OPERATING TIME (SEC.
5
3
2.8
2.2
Q.
The neutral of a 10 MVA, 11 kV alternator is earthed through a resistance of 5
Ω
. The earth fault relay is set to operate at 0.75 A. The CT's have a ratio of 1000 : 5. The percentage of alternator winding unprotected is _______%.
View More
Join BYJU'S Learning Program
Grade/Exam
1st Grade
2nd Grade
3rd Grade
4th Grade
5th Grade
6th grade
7th grade
8th Grade
9th Grade
10th Grade
11th Grade
12th Grade
Submit
Related Videos
Basics of Communication Systems
PHYSICS
Watch in App
Explore more
Components
Standard XII Physics
Join BYJU'S Learning Program
Grade/Exam
1st Grade
2nd Grade
3rd Grade
4th Grade
5th Grade
6th grade
7th grade
8th Grade
9th Grade
10th Grade
11th Grade
12th Grade
Submit
AI Tutor
Textbooks
Question Papers
Install app