The choice of 25 kV was not based on a neat and tidy ratio
of the supply voltage, but rather related to the efficiency
of power transmission as a function of voltage and cost.
For a given power level, a higher voltage allows for a
lower current and usually better efficiency at the greater
cost for high voltage equipment. It was found that 25kV was
an optimal point, where an even higher voltage would still
improve efficiency but not by a significant amount in
relation to the higher costs incurred by the need for
greater clearance and larger insulators.
Dear ramesh Kumar ,
i got your quest
can you read my previous mail last 3 line.
power transmision @ 25 KV no need why because 220/66/33/11
kV hence we can reduce the cost of conductor.but incase of
railway you know ,if we increase the voltage level we have
to give a clearance between the live conductor.
i can assure you this by a video if you give your email id
regards
salah
A senior lecturer well experienced in electrical eng said
that to avoid theft of railway equipments the use of
standard voltage(11KV,33KV etc.) equipments is avoided.
Only sub standard voltage levels are used..
Dear Mr. salah,
as your Answer No.5, my E-mail Id is
sharma_electrical.engineer@rediffmail.com.
please forward to me, that video, in which {if we increase
the voltage level we have to give a clearance between the
live conductor}.
Thanks.
We wish to test 60 Hz systems from a 50 Hz supply. To
acheive frequency conversion, we use a VFD. The VFD powers
40 kVA transformer, which has motor and non-motor loads on
it. Will the transformer work?
1.In two wattmeter method if one wattmeter shows Negative
reading then wat is reason?
2.Wat is the reason for low voltage in houses?
3.Wat is meant by current and voltage? wat is difference
between the two?
along with your userid / name. ThanQ
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