What is the difference between online ups and offline ups?
Answer Posted / renjith mr
Online UPS powers the load from Battery always whereas Offline UPS powers it only during power failure. Online UPS is needed only for equipments where the power failure is not entertained even for milliseconds.
| Is This Answer Correct ? | 11 Yes | 3 No |
Post New Answer View All Answers
Please clarify, 1. Is it required to lay two runs of GI wire along with Armoured LT cable if it is laid between one big mains (63Amps TPN SDF) to small main (32A TPN SDF) with proper glanding termination? 2. If the armoured cable with proper glanding is laid from DB to CNC machine, is it required to run two runs of body earthing to the Machine from DB? 3.If the armoured cable with proper glanding is laid from Substation to Hangar, distance is approx. 100 mtrs, is it required to do earthing at shop area though the primary termination at substation is earthed through gland.
What is difference between slip rings and carbon burushes?
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?
what is effect of 5amp fuse on 2mva pry protection of transformer
Sir,In our company there are 3 caterpillar make(capacity:(1) 3.3KV,2.5MW(2)3.3KV,2.5MW & (3)3.3KV,1.9MW) & 1 deutz make (capacity:11KV,3.8MW)gas engines utilised,all are running in paralell. There are three transformer utilised,(1) 6.25MVA,3.3KV/22KV,Impedence voltage:6.7% used for two generator,both are 2.5MW(2)5.5MVA,3.3KV/22KV,Impedence voltage:7.2% used for one generator of 2.5MW & (3) 5.5MVA,11KV/22KV,Impedence voltage:7.8% used for one generator of 2.5MW.all generator breakers capacity of 1250Amps. Sir,I want the details of fault level calculation of generator,transformer individually & for whole system. If you require any information from me.feel free for contact me sir.pl.send the answer of my question as the earliest as possible.
How to calculate VCB rating for 33KV ,25 MW Power line?
how to select the isolation tranformer for siemens 802dsl cnotroller
Advantage of LT panel vs HT panel
How many lightning arrestors to be installed on 50MX60MX10M building and is there any formular for that?
does buccholz in a transformer use batteries
what is the calculation involved to design the heater to heat 10KL of water in temperature control unit?
I am applying for NTPC examination.Can we please provide previous paper to my mail prasad.chintala108340@gmail.com
Can RCD's used to protect the VVVF drive if not why.
what is meant by flywheel and its role in retardation test
How can a equal potential zone be carried out in conductors?