at meter room 50 hrc switch installed,but there are not get earthing proper,so what happen?and 11kv transformer out put going in to hrc main 400a three nog each? so earthing is require for all switch? (some customer made earthing at there home.)
1962Hello Friends, How can we recognize the CT Star Point is S1 or S2 in case of Electro Mechanical Relays and what is meant by Restraining coil in relays and what is the purpose of that.. thank you in advance..
2214What is CRT (Contact Resistance Test) for Isolators or Dis- connector Switches? Why we performed it & whats the Testing procedure.
1 11355Whether IP65 enclosure box blocks ventilation if driver for LED have to enclosed inside IP65 box
2153If we increases the %impedance of Transformer then price of Transformer will increases or decreases.
1 3814In synchronous motor, how the field current is related to armature current..i know its inversely proportional..but concept wise...i was nt clear....pls help me...
2110We 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?
2197Post New Siemens Electrical Engineering Interview Questions
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Your project sponsor has requested a cost estimate for the project you're working on. This project is similar in scope to a project you worked on last year. She would like to get the cost estimates as soon as possible. Accuracy is not her primary concern right now. She needs a ball park figure by tomorrow. You decide to use: A. Analogous estimating techniques B. Bottom-up estimating techniques C. Parametric modeling techniques D. Computerized modeling techniques
The foundations are placed below ground level, to increase?
Dear friends I want to design busbar for1600 kva transformer(i.e2100 amps) what are all the factors to be considered before selectinga busbar what are all the standard sizes of busbars what is the formula for finding current of copper and aluminium busbar
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