What is power in wattage of 8.5 TR AC

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What is the difference in calculating size of AC cables compared to calculating size of DC Cables? Usually DC Cables are larger than AC Cables although they have the same ampacity. Why is it?

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What is EHT(Abrebiation,Function,Voltage Regulation & how it works?

2 Answers   Adhunik,

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What are the causes of eddy current losses?

1 Answers   Schneider,

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Where earth point should provided in Ships or Submirines.

2 Answers   SSC,

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what is surge??

1 Answers  

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why we use to transmit the power in three phases intead of single phase ?

4 Answers  

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which type of motor is suitable for lift?

18 Answers   NTTF Nettur Technical Training Foundation, Pothigai Power Solutions,

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Why one can experience electrical Shock due to Voltage or Current?? or both voltage or current??

11 Answers  

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what are the different methods for the starting of a synchronous motor.

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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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we have one pumping station and 4.6 MW 7 no.s synchronous motors.so there is no required HT capacitor to improve power factor.But we have two no.s of 25 Mva power transformer connect to distribute the power for motors connect with 220 kv line.So i have required the HT capacitor to improve power factor at HT side i mean power transformer bus side.So please suggest how much HT capacitor banks required for same.

1 Answers  

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