what do you know about electrical

15 Answers  

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I have tow 200 KVA UPS, both are in parallel mode.My question is that, both are running on battery when power fail, if one of them fail (Eg rectifire fails or some other reason), at thet time reverse power will come to faild ups if it comes then it will harm to failed ups or not? if not then how it protects to faied ups????????????????

1 Answers  

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Where is the center of magnetic field in alternator

1 Answers   GMR, Siemens,

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my UPS suddenly goes off and all panel light also blow off.This happens even main electric supply is not interrupted.After some time it automatically starts functioning normally.Batteries are new.

0 Answers  

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Give the selection criteria of a 3 Phase transformer for industrial purposes ?

5 Answers   NDDB, TATA,

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which turbine has high thermal efficiency a)open gas turbine b)close gas turbine

2 Answers  

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what is the formulae for selcting capacitor bank to increas pf

4 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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is it possible to convert electrical energy to light energy for transmission purposes?

7 Answers  

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which type of stability limit is higher,steady state or transient? why?

0 Answers  

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what is the 2MVA distribution transformer efficiency

1 Answers  

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what is the difference between servo voltage stabilizer and general voltage stabilizer?

1 Answers  

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