what are the points to be consider for MCB(miniature
circuit breaker selection?
Answer Posted / babu
rated current
Is This Answer Correct ? | 2 Yes | 1 No |
Post New Answer View All Answers
if field breaker of generator is closed prior to its rated speed on a power generating unit. what will be the effect on generator, unit transformer and starting transformer.
What are the various types of BUSBAR Schemes? explain each
Why an ac systems are preferred over dc systems?
In AC if the direction of current keeps reversing every half cycle, how does it propogate through the transmission lines?
What is rotary phase converter?
mccb service sittings be done?
What are the advantages and disadvantages of the dc motors?
DERIVE AN EXPREION FOR MAXIMUM POER TRANSMISSION, WHAT ARE ITS APPLICATIONS.
Give some example of fault limiting devices?
What does quality factor depend on in resonance?
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?
how does WTI work ?
What is primary and backup protection?
What would be the size of wire used for 2 Ton of window A.C?
what is meant by IGBT how they differ from tyristor ?