Why SF6,VCB,Oil Ckt Breakers are use in HT Side need brief
information ?
Answer Posted / ashoke
Because the air circuit beakers are unable to quench the arc
immediately due to High voltage and current.So a more
efficient arc quenching medium is require like
oil,vacuum,SF6 in side.The HT contains higher voltage level
and the fault current is also higher so a brief description
is needed for choosing the appropriate CB.
| Is This Answer Correct ? | 7 Yes | 4 No |
Post New Answer View All Answers
What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works?
What are the advantage of free wheeling diode in a full wave rectifier?
how to select automotive wire by mathematical equation with given current, vlotage and resistance
can any one suggest paper presentation topies for electrical engg?
what is sevice settings for mccb?How can be it setted?
How test for Ddo vector group test condition?
What types domain of laplace transforms? What behavior can laplace transform predict how the system work?
What is CCT (Correlated Color Temperature) ?
Block diagram of Power line communication?
What happen when change order of CT in GIS feeder?
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?
132/66kv sub-station procation ?
What range of speed can you get with the armature control method of speed control of d.c. Shunt motor?
what is the difference between "Rotary bypass isolation switch and Normal bypass switch" pls share indepth techs?
How to work definite,over pluxing,revers power,OSR relay