Discuss
menu
search
person
Login
Register
search
edit
Ask a Question
Discuss
All Activity
Q&A
Questions
Hot!
Unanswered
Tags
Ask a Question
Overfluxing protection is recommended for?
Speak Question
asked
Mar 20, 2018
by
anonymous
overfluxing
protection
thumb_up_alt
0
like
thumb_down_alt
0
dislike
56
views
Please
log in
or
register
to add a comment.
Please
log in
or
register
to answer this question.
1
Answer
Speak Answer
answered
Mar 20, 2018
by
anonymous
Overfluxing protection is recommended for
generator transformer of the power plant.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
Please
log in
or
register
to add a comment.
← Prev Question
Next Question →
Related questions
asked
Mar 20, 2018
by
anonymous
Over voltage protection is recommended for?
Last answer:
Over voltage protection is recommended for hydro-electric generators, steam turbine generators, gas turbine generators.
over
voltage
protection
recommended
thumb_up_alt
0
like
thumb_down_alt
0
dislike
63
views
1
answer
asked
May 8, 2018
by
anonymous
A relay used for protection of motors against overload is :
A relay used for protection of motors against overload is : (A) Impedance relay (B) Electromagnetic attraction type (C) Thermal relay (D) Buchholz's relay
Last answer:
A relay used for protection of motors against overload is : Thermal relay
relay
used
protection
motors
overload
thumb_up_alt
0
like
thumb_down_alt
0
dislike
236
views
1
answer
asked
May 1, 2018
by
anonymous
A negative sequence relay is used for protection of
A negative sequence relay is used for protection of (1) Generator (3) Motor (2) Transformer (4) Long Transmission lines
Last answer:
A negative sequence relay is used for protection of Generator
negative
sequence
relay
used
protection
thumb_up_alt
0
like
thumb_down_alt
0
dislike
454
views
1
answer
asked
Apr 30, 2018
by
anonymous
For protection of rotating machines against lightning surges _______ is used.
For protection of rotating machines against lightning surges _______ is used. (1) lightning arrester (2) capacitor (3) combination of lightning arrester and capacitor (4) lightning conductor and arrester
Last answer:
For protection of rotating machines against lightning surges combination of lightning arrester and capacitor is used.
protection
rotating
machines
lightning
surges
thumb_up_alt
0
like
thumb_down_alt
0
dislike
4.0k
views
1
answer
asked
Apr 29, 2018
by
anonymous
Reactance relay is normally preferred for protection against
Reactance relay is normally preferred for protection against
Last answer:
Reactance relay is normally preferred for protection against earth faults
reactance
relay
protection
thumb_up_alt
0
like
thumb_down_alt
0
dislike
72
views
1
answer
asked
Apr 26, 2018
by
anonymous
Surge absorbers are used for protection against
Surge absorbers are used for protection against
Last answer:
Surge absorbers are used for protection against low voltage high frequency oscillations
surge
absorbers
used
protection
thumb_up_alt
0
like
thumb_down_alt
0
dislike
2.9k
views
1
answer
asked
Mar 20, 2018
by
anonymous
The inverse definite mean time relays are used for over current and earth fault protection of transformer against?
Last answer:
The inverse definite mean time relays are used for over current and earth fault protection of transformer against internal short-circuits.
inverse
definite
mean
time
relays
used
over
current
earth
fault
protection
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
2.5k
views
1
answer
asked
Mar 20, 2018
by
anonymous
The single phasing relays are used for the protection of?
Last answer:
The single phasing relays are used for the protection of three phase motors.
single
phasing
relays
used
protection
thumb_up_alt
0
like
thumb_down_alt
0
dislike
137
views
1
answer
asked
Mar 20, 2018
by
anonymous
For the protection of power station buildings against direct strokes the requirements are?
Last answer:
For the protection of power station buildings against direct strokes the requirements are interception, conduction and dissipation.
protection
power
station
direct
strokes
thumb_up_alt
0
like
thumb_down_alt
0
dislike
58
views
1
answer
asked
Mar 20, 2018
by
anonymous
The delay fuses are used for the protection of?
Last answer:
The delay fuses are used for the protection of motors.
delay
fuses
protection
thumb_up_alt
0
like
thumb_down_alt
0
dislike
75
views
1
answer
asked
May 8, 2018
by
anonymous
Blind spot is a point in the zones of protection where
Blind spot is a point in the zones of protection where
Last answer:
Blind spot is a point in the zones of protection where No protection is available.
blind
spot
point
zones
protection
thumb_up_alt
0
like
thumb_down_alt
0
dislike
587
views
1
answer
asked
Mar 20, 2018
by
anonymous
Protection by fuses is generally not used beyond?
Last answer:
Protection by fuses is generally not used beyond 100 A .
protection
fuses
thumb_up_alt
0
like
thumb_down_alt
0
dislike
142
views
1
answer
asked
Mar 20, 2018
by
anonymous
Discrimination between main and backup protection is provided by the use of relays which are?
Last answer:
Discrimination between main and back up protection is provided by the use of relays which are slow.
discrimination
between
main
backup
protection
use
relays
thumb_up_alt
0
like
thumb_down_alt
0
dislike
305
views
1
answer
asked
Mar 20, 2018
by
anonymous
A fuse in a motor circuit provides protection against?
Last answer:
A fuse in a motor circuit provides protection against short-circuit and overload.
fuse
motor
circuit
protection
thumb_up_alt
0
like
thumb_down_alt
0
dislike
112
views
1
answer
asked
Mar 19, 2018
by
anonymous
A thermal protection switch can protect against?
Last answer:
A thermal protection switch can protect against overload.
thermal
protection
switch
protect
thumb_up_alt
0
like
thumb_down_alt
0
dislike
180
views
1
answer
asked
Aug 9, 2017
by
anonymous
Primary and Backup Protection
Primary and Backup Protection
Last answer:
Primary and Backup Protection B,D,G,I are the primary protection. A,C,H,J are the backup protection. About 90% of faults are clear by Primary Protection. So ... ordinated backup (primary is at various station and backup is at control room with computer)
primary
backup
protection
thumb_up_alt
0
like
thumb_down_alt
0
dislike
356
views
1
answer
asked
Jul 25, 2019
by
anonymous
Explain in detail over-voltage protection.
Explain in detail over-voltage protection.
Last answer:
Over-voltage protection: Over-voltage protection to the thyristor is provided using: i) R-C Snubber circuit ii) Non-linear resistor Thyrector A) Snubber Circuit: It is basically a ... returns to its high resistance state. Thyrector is normally placed across the supply terminals.
over-voltage
protection
thumb_up_alt
0
like
thumb_down_alt
0
dislike
2.5k
views
1
answer
asked
Mar 20, 2018
by
anonymous
Ungrounded neutral transmission system is not recommended because of system?
Last answer:
Ungrounded neutral transmission system is not recommended because of system insulation being overstressed due to over voltages, insulation overstress may lead to failure and subsequent phase to phase faults, being inadequately protected against ground fault.
ungrounded
neutral
transmission
system
thumb_up_alt
0
like
thumb_down_alt
0
dislike
50
views
1
answer
asked
Jun 23, 2020
by
anonymous
Explain the “Differential Protection Scheme” used for alternators with neat labeled diagram.
Explain the “Differential Protection Scheme” used for alternators with neat labeled diagram.
Last answer:
Differential Protection Scheme for Alternator: Figure shows the differential protection provided to 3 phase alternator. Here identical CTs are placed on both sides of 3 phase alternator and ... causing its operation. Relay sends trip signal to the CB, thereby alternator circuit is tripped.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
20
views
1
answer
asked
Jun 23, 2020
by
anonymous
Explain differential protection scheme for busbars with neat sketch.
Explain differential protection scheme for busbars with neat sketch.
Last answer:
Differential Protection Scheme for Bus bar: Under normal conditions, the sum of the currents entering the bus bar zone is equal to those leaving it and no current flows through the relay ... of these currents will flow through the relay coil causing opening of circuit breaker of bus-bar.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
15
views
1
answer
asked
Jun 23, 2020
by
anonymous
List two limitations of Differential-Protection scheme for transformer.
List two limitations of Differential-Protection scheme for transformer.
Last answer:
Limitations of Differential Protection Scheme of Transformer: 1) Due to the magnetization characteristics of the CTs used, the ratio errors change with respect to the circulating currents. 2) ... & improper operation. 5) Inrush of magnetizing current may lead to inadvertent operation.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
80
views
1
answer
asked
Jul 21, 2019
by
anonymous
How can we use CT and PT for protection purpose?
How can we use CT and PT for protection purpose?
Last answer:
CT and PT for Protection purpose: Current transformer (CT) and Potential transformer (PT) are instrument transformers, which are used in conjunction with protective relays for protection purpose. The CT ... from the healthy part. In this way the CT and PT can be used for protection purpose.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
65
views
1
answer
asked
Jun 17, 2018
by
anonymous
For complete protection of a three-phase line:
For complete protection of a three-phase line: A) three Phase relays and three Earth fault relays are required B) three Phase relays and two Earth fault relays are required C) two Phase relays and two Earth fault relays are required D) two Phase relays and one Earth fault relay are required
Last answer:
For complete protection of a three-phase line: two Phase relays and one Earth fault relay are required
thumb_up_alt
0
like
thumb_down_alt
0
dislike
90
views
1
answer
asked
Jun 4, 2018
by
anonymous
For the protection of parallel feeders fed from one end, the relays used are:
For the protection of parallel feeders fed from one end, the relays used are: A) non-directional relays at the source-end and directional relays at the load-end B) non-directional relays at both the ends C) directional relays at the source-end and non-directional at the load-end D) directional relays at both the ends
Last answer:
For the protection of parallel feeders fed from one end, the relays used are: non-directional relays at the source-end and directional relays at the load-end
thumb_up_alt
0
like
thumb_down_alt
0
dislike
241
views
1
answer
asked
May 24, 2018
by
anonymous
A loss of excitation protection scheme for large generating unit employs
A loss of excitation protection scheme for large generating unit employs A) under frequency relays B) offset Mho relay C) reactance relay D) percentage differential relay
Last answer:
A loss of excitation protection scheme for large generating unit employs offset Mho relay
thumb_up_alt
0
like
thumb_down_alt
0
dislike
55
views
1
answer
asked
May 22, 2018
by
anonymous
For complete protection ofa 3-phase line:
For complete protection ofa 3— phase line: (1) Three phase and three—earth fault relays are required (2) Three phase and two—earth fault relays are required (3) Two phase and two—earth fault relays are required (4) Two phase and one-earth fault relays are required
Last answer:
For complete protection ofa 3— phase line: Two phase and one-earth fault relays are required
thumb_up_alt
0
like
thumb_down_alt
0
dislike
184
views
1
answer
asked
May 14, 2018
by
anonymous
The color of wire recommended for earth connection as per BIS code is
The color of wire recommended for earth connection as per BIS code is
Last answer:
The color of wire recommended for earth connection as per BIS code is Green
thumb_up_alt
0
like
thumb_down_alt
0
dislike
75
views
1
answer
asked
Apr 9, 2018
by
anonymous
Recommended IiL (minimum input current when the input voltage represents logical zero) is minimum for ...
Recommended IiL (minimum input current when the input voltage represents logical zero) is minimum for the TTL family A) LS B) ALS C) AS D) S
thumb_up_alt
0
like
thumb_down_alt
0
dislike
48
views
0
answers
asked
Mar 28, 2018
by
anonymous
Why is a MISC meter not recommended for DC measurement?
Last answer:
MISC meter not recommended for DC measurement because the error is high due to the hysteresis effect.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
141
views
1
answer
asked
Jun 4, 2018
by
anonymous
Which type of protection is provided on a generator to protect against stator insulation failure?
Which type of protection is provided on a generator to protect against stator insulation failure? A) Differential protection B) Overcurrent relay C) Thermocouple actuated alarm D) Reverse power relay
Last answer:
Which type of protection is provided on a generator to protect against stator insulation failure? A) Differential protection B) Overcurrent relay C) Thermocouple actuated alarm D) Reverse power relay
thumb_up_alt
0
like
thumb_down_alt
0
dislike
280
views
1
answer
asked
Jun 4, 2018
by
anonymous
Protection of transformer from all types of faults is by using
Protection of transformer from all types of faults is by using (A) over current relay (B) differential relay (C) distance relay (D) Buchholz relay
thumb_up_alt
0
like
thumb_down_alt
0
dislike
102
views
0
answers
asked
May 12, 2018
by
anonymous
The type of backup protection scheme widely used in the field is
The type of backup protection scheme widely used in the field is (A) Relay backup (B) Breaker backup (C) Remote backup (D) Auxiliary backup
Last answer:
The type of backup protection scheme widely used in the field is Remote backup
thumb_up_alt
0
like
thumb_down_alt
0
dislike
928
views
1
answer
asked
Jun 23, 2020
by
anonymous
Explain with neat sketch, the Pilot wire protection scheme applied to transmission line.
Explain with neat sketch, the Pilot wire protection scheme applied to transmission line.
Last answer:
Pilot Wire Protection scheme of Transmission Line : Figure shows the single line diagram of Merz price voltage balance system for pilot wire protection of three phase transmission line. ... through the relay, which gives trip signal to the circuit breaker for protection of transmission line.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
86
views
1
answer
asked
Jun 23, 2020
by
anonymous
Discuss in brief the principle of distance protection and state four advantages of distance protection scheme.
Discuss in brief the principle of distance protection and state four advantages of distance protection scheme.
Last answer:
Advantages: 1. System is economical 2. High speed of interruption 3. Suitable for very long and high voltage transmission lines. 4. No problem of pilot wires.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
24
views
1
answer
asked
Jun 23, 2020
by
anonymous
State two requirements of transmission line protection.
State two requirements of transmission line protection.
Last answer:
Requirements of Transmission Line Protection: 1) Faults on lines should be quickly detected to initiate actions to maintain system stability. 2) For very long lines the protection system must be capable ... backup protection in the event of failure of circuit breaker (nearest to fault) to operate.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
17
views
1
answer
asked
Jul 21, 2019
by
anonymous
Explain differential protection of busbar.
Explain differential protection of busbar.
Last answer:
Differential protection Scheme for bus bar: Under normal conditions the sum of the currents entering the bus bar zone is equal to those leaving it and no current flows through the relay ... . The difference of these currents will flow through the relay coil causing opening of circuit breaker.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
5.0k
views
1
answer
asked
Jul 21, 2019
by
anonymous
Explain over-current protection of transformer.
Explain over-current protection of transformer.
Last answer:
Over-Current Protection of Transformer: Simple over-current & earth fault protection of transformer against external shortcircuit and excessive overloads is shown in the above figure. The ... trip command to the circuit breaker and the transformer is disconnected from load or fault.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
2.5k
views
1
answer
asked
Jul 21, 2019
by
anonymous
Explain negative phase sequence protection of alternator.
Explain negative phase sequence protection of alternator.
Last answer:
Negative phase sequence protection of alternator: Unbalanced loading on alternator mainly causes the negative sequence currents which generate the negative sequence components of magnetic fields. These fields ... components due to unbalance and operates the relay which further operates CB.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
64
views
1
answer
asked
Jul 21, 2019
by
anonymous
Explain fault bus protection scheme.
Explain fault bus protection scheme.
Last answer:
Fault bus protection of busbar: In this scheme, the substation is so designed that every fault on the bus bar is converted to earth fault. Under normal operating conditions, there is no current flowing ... This results in operation of relay to actuate trip coil of CB to trip the circuit.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
67
views
1
answer
asked
Jul 21, 2019
by
anonymous
Explain distance protection of transmission line with neat sketch diagram.
Explain distance protection of transmission line with neat sketch diagram.
Last answer:
Distance protection of Transmission line: Distance protection scheme uses impedance relay. The relay operation is based on the impedance (or distance) between the relay and point of fault. Figure shows ... than ZL and impedance relay operates which operates the CB and line is protected.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
79
views
1
answer
asked
Jul 21, 2019
by
anonymous
Write down limitation of differential protection of transformer.
Write down limitation of differential protection of transformer.
Last answer:
Limitations of differential protection of transformer: 1) Due to the magnetization characteristics of the CTs used, the ratio errors change with respect to the circulating currents. 2) The pilot wires ... current (higher imbalance) due to which accuracy of sensing & operation is decreased.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
4.9k
views
1
answer
asked
Mar 20, 2018
by
anonymous
H.R.C. fuses provide best protection against?
Last answer:
H.R.C. fuses provide best protection against short-circuits.
hrc
fuses
thumb_up_alt
0
like
thumb_down_alt
0
dislike
76
views
1
answer
asked
6 days
ago
by
anonymous
Surplus budget is recommended during : (1) Boom (2) Depression (3) Famines (4) War
Surplus budget is recommended during : (1) Boom (2) Depression (3) Famines (4) War
Last answer:
Depression
economics
thumb_up_alt
0
like
thumb_down_alt
0
dislike
2
views
1
answer
asked
Apr 10, 2018
by
anonymous
Use of macro instead of function is recommended
Use of macro instead of function is recommended (1) When one wants to reduce the execution time (2) When a function is called in many places in a program (3) Both (1) and (2) (4) None of these
thumb_up_alt
0
like
thumb_down_alt
0
dislike
37
views
0
answers
asked
Jan 19, 2018
by
anonymous
What is Rate Monotonic Scheduling (RMS) ? when its use recommended ?
Last answer:
There are two main types of task scheduling algorithm in Real-Time Operating Systems (RTOS).1. Rate Monotonic Scheduling (RMS)2. Earliest-Deadline-First (EDF)Rate Monotonic Scheduling ( ... shortest period process and so on.Rate Monotonic Scheduing do not support non-periodic processees.
thumb_up_alt
3
like
thumb_down_alt
0
dislike
87
views
1
answer
asked
Nov 24, 2018
by
anonymous
Mho relay is used for protection of
thumb_up_alt
0
like
thumb_down_alt
0
dislike
109
views
0
answers
asked
May 22, 2018
by
anonymous
A series inductor is normally added in a thyrister circuit for achieving protection against:
A series inductor is normally added in a thyrister circuit for achieving protection against:
Last answer:
A series inductor is normally added in a thyrister circuit for achieving protection against: high di/dt
thumb_up_alt
0
like
thumb_down_alt
0
dislike
61
views
1
answer
asked
May 8, 2018
by
anonymous
Which of the following is the least expensive protection for over current in low voltage system?
Which of the following is the least expensive protection for over current in low voltage system? (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker
Last answer:
Which of the following is the least expensive protection for over current in low voltage system? (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker
over
current
low
voltage
system
thumb_up_alt
0
like
thumb_down_alt
0
dislike
160
views
1
answer
asked
Apr 25, 2018
by
anonymous
Systems for Protection from negative sequence current is provided normally for
Systems for Protection from negative sequence current is provided normally for (a) Transformers (c) Transmission lines (b) Generators (d) Motors
Last answer:
Systems for Protection from negative sequence current is provided normally for Transmission lines
thumb_up_alt
0
like
thumb_down_alt
0
dislike
67
views
1
answer
asked
Apr 14, 2018
by
anonymous
Mho relay is usually employed for protection of
Mho relay is usually employed for protection of (A) Short lines (B) Medium lines (C) Long lines (D) Any line
Last answer:
Mho relay is usually employed for protection of long lines.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
379
views
2
answers
...