why do power factor in the three phase induction motor increases with the load ???.

3 Answers   Jindal,

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what are the main hormonics in ac?

1 Answers  

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Can i get some examples of mechanical devices?

1 Answers  

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Recently we had experienced following problem All RCCB breakers (connected to the load as well as spares) connected to various UPS systems at various floors at a high rise building tripped during a power break down and upon starting up of generator.This Generator is recently inducted into the installation. Can any one explain the reason behind this tripping. Regards Viswanathan

1 Answers  

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What do you mean by isolators and circuit breakers?

6 Answers   Bhushan Power Steel,

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

2 Answers  

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types of central Air conditioner plant?

0 Answers  

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Why we use Capacitor in Single Phase Induction Motor?

12 Answers   IIT,

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what is method for testing CT

0 Answers   DCM,

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if we give DC suply to the AC motor what hapen

5 Answers   TATA,

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Transmission line design. Say, I have a 1MVA generator and 2 transformers that will have the same load. What would be the proper rating of the trasformers? Is it safe to say, that I will simply divide the total rating of the generator?

1 Answers  

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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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