Answer / saurabh

power factor helps us to know ,what part of the input power
is being effectively used

Answer / nagendra murthy m

power factor is the ratio of the real power flowing to load
to the apparent power in the circuit. it is a dimensionless
number between 0 and 1.The significance of power factor lies
in the fact that utility companies supply customers with
volt-amperes, but bill them for watts. Power factors below
1.0 require a utility to generate more than the minimum
volt-amperes necessary to supply the real power (watts).
This increases generation and transmission costs. For
example, if the load power factor were as low as 0.7, the
apparent power would be 1.4 times the real power used by the
load. Line current in the circuit would also be 1.4 times
the current required at 1.0 power factor, so the losses in
the circuit would be doubled. so this must be minimized
using suitable methods.

Answer / malik

power fector is cosign angle between voltage & current.

PF=kw/kva = cos
it hould be 1 or unity
eg if input is 230 & out put is 230 then pf=1

Answer / amit

you can purchase power factor from your nearest relinace
fresh outlet.

its pf season go they will give u 40% discount.

Neutral CT for 45MVA 132/11 KV YNd11 Transformer. NCT REF CLASS-PS or 5P20 with 20VA burden which is suitable.

1 Answers  

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whats the advandage of PMG in alternator?

2 Answers  

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what r the types of transmission line?

28 Answers   DIET, RRB, WAPDA Water and Power Development Authority,

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State the difference between Three winding transformers and Two winding transformers ? where its used?

8 Answers  

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do anyone out there know where to find a compleete list on acronyms/abbreviations used in offshore electric engineering. MCB - Micro Circuit Breaker, MCCB-Mouldes Case Circuit Breaker, ELCB-Earth Lekage Circuit Breaker, ELMCB- etc.....

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what is different between electrical ckt&electronic ckt

4 Answers   Ashok Leyland,

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diffrence between abcb and mocb

1 Answers   UltraTech,

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We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?

0 Answers   Siemens,

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What is the difference between 11kv/110v & 33kv/110v ? If both 11 & 33KV give 110v then what is the diiference ?

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Why the wave trap is put in Y phse only in switchyard?why not in other phases?

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what is the calculation of current when a clampmeter is attached to two phases of any drives.

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How the earth fault relay works please explain?????????

2 Answers  

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