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.)1105
Hello 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..1252
What is CRT (Contact Resistance Test) for Isolators or Dis- connector Switches? Why we performed it & whats the Testing procedure.1 9146
What is Hi-Pot Test for Grid Station HV Equipments?2 6061
is earthing is necessary if we use armoured cable1 3955
How we can make sure cable size of LT cable without any parameter.2 4964
Whether IP65 enclosure box blocks ventilation if driver for LED have to enclosed inside IP65 box1197
If we increases the %impedance of Transformer then price of Transformer will increases or decreases.1 2292
How to work star delts method in the case of single phase motor?4 6042
How to do the REF Stability test for power transformers in Site?1 7182
In 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...1179
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?1198
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