Total Answers Posted # 521
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Question { 17343 }
What is YNyn Transformer? and what are the other types in
this?
Answer
type another is Yy6 or YNyn6
| Is This Answer Correct ? | 5 Yes | 3 No |
Question { 6650 }
How do I know if a transformer is saturated?
I am doing the simulation of the saturation of a
transformer, but what parameter tells me when a transformer
is saturated? How do you calculate? is on the plate?, there
is a rule that can help me? How could model? I understand
the saturation occurs when the flow can no longer bind to
the other winding, this is given to certain current, this
current is the same that appears as the highest in the bale
of features?
Thank you for your help
Eduardo Alvarez
Guatemala
Answer
current of the CT is made available.For CTs with primary
winding you apply small voltage using step down transformer
and variable auto-transformer and measure the saturation
current when the secondary current ceases to increase and
then applying the ratio.For ring type, you have to boost
the current in the cable.Saturation current is usually
higher than the rated current
| Is This Answer Correct ? | 0 Yes | 0 No |
Question { 6650 }
How do I know if a transformer is saturated?
I am doing the simulation of the saturation of a
transformer, but what parameter tells me when a transformer
is saturated? How do you calculate? is on the plate?, there
is a rule that can help me? How could model? I understand
the saturation occurs when the flow can no longer bind to
the other winding, this is given to certain current, this
current is the same that appears as the highest in the bale
of features?
Thank you for your help
Eduardo Alvarez
Guatemala
Answer
current of the CT is made available.For CTs with primary
winding you apply small voltage using step down transformer
and variable auto-transformer and measure the saturation
current when the secondary current ceases to increase and
then applying the ratio.For ring type, you have to boost
the current in the cable.Saturation current is usually
higher than the rated current
| Is This Answer Correct ? | 0 Yes | 0 No |
what is skin effect
Answer
not distribute uniformly and it has a tendency to
concentrate near the surface of the conductor,as the
centre of the conductor has a larger inductance. This is
called skin effect.
| Is This Answer Correct ? | 13 Yes | 0 No |
what is skin effect
Answer
not distribute uniformly and it has a tendency to
concentrate near the surface of the conductor,as the
centre of the conductor has a larger inductance. This is
called skin effect.
| Is This Answer Correct ? | 6 Yes | 0 No |
what is skin effect
Answer
not distribute uniformly and it has a tendency to
concentrate near the surface of the conductor,as the
centre of the conductor has a larger inductance. This is
called skin effect.
| Is This Answer Correct ? | 5 Yes | 1 No |
Question { 3052 }
dear all, in motor operation , motor is of 100 hp and
bimetal relay setting is 130 amp, if relay is getting
tripped on 120 amp balance current what can be the
reason? Relay is newly replaced. I dont know but is
there any frequency effect in thit case? Can frequency
variation affect bimetal relay operation?
Answer
plays a role for setting as the relay acts at a certain
temp.Hence you have to compensate for ambient
temp.Frequency has no effect on the setting .
| Is This Answer Correct ? | 5 Yes | 0 No |
what is meant by trip circuit supervision & directional or
non directional over current ?
Answer
for loss of DC supply,faults on trip coil or cables,faults
in auxiliary contacts and in itself, with breaker in any
position.Directional OCR acts for over current in one
direction only where non-directional acts for both the
directions
| Is This Answer Correct ? | 9 Yes | 1 No |
What is the minimum distance between taransformer (say 2000
kva)and its earth pit?
Answer
earth wire should not be very long to increase effective IR
value and earth pit should not be a hindrance being very
close.
| Is This Answer Correct ? | 2 Yes | 8 No |
Question { 4901 }
On the transformer breather at what length should i change
my sililca gel.
Answer
colour
you can dry in the sun or carefully roast till the the
whole mass regains white colour and re-use
| Is This Answer Correct ? | 2 Yes | 4 No |
Question { 3464 }
How size of Earth Strip is determined for a particular
Fault current.
Answer
current as it is momentary ,it is designed to take the max
load current
| Is This Answer Correct ? | 1 Yes | 0 No |
Question { 4714 }
how ELCB drip when earth and phase touch together?
Answer
| Is This Answer Correct ? | 0 Yes | 0 No |
