Forum Replies Created
2012/10/27 at 2:02 pm in reply to: Variable speed devices y continius chemical process indutries #13249
you can perform this phenomena through VFD
As you defined slip is infinite than your machines speed is almost zero,in induction machine initialy at zero speed torque is zero.
use on-off sequential timer in control for motor starter
pref. make- SELEC ,SIEMENS,AEG
We can set our required time for on and off ,
your purpose will solve with this
while transformer is charges theres capacitive effect between turns of winding of x'-mer and it act as a capacitive load when switched on which in turns huge inrush current when switched on.
isoaltion x'mers isolate system from jerks,sudden changes in power DC Contents comming from mains which could mis interpritate x-ray machine2011/10/31 at 4:27 pm in reply to: 11 KV SUBSTATION / under ground cable tripped on earth fault #12611
nothing to worry as per my opinion protetion system mal functioned,pl. check if protection system electronic PCB based
use Variable freq.Drive for converting 1-phase to three phase power
Spir Georges GHALI
first you check nominal current rating of your existing cable if ampere rating is below your requirment then lay same size cable parallel to existing cable size will get double and so ampere capacity
heloo ,i want to known about phase sequance correction.
procure phase sequence meter which is enable to help you correct phase sequence,which will reduce your work in electrical installation
as looking your load 50,70sq. mm cable is not much enough if you are optimising total load than current will be approx. 400amp since your supply voltage is 220v3-ph.
so main cable you need 300sq. mm aluminium as incomming and then distributo via distribution box to all four machines your 40HP load machines need 70Sq. mm aluminium and 25HP Machine need 35sq.mm Aluminium Cable
conductor dia. increase b'caouse of your 220v 3-phase power2011/03/03 at 5:20 pm in reply to: What is the major cuase of heating in circuit breakers? #11873
harmonics2011/03/03 at 5:18 pm in reply to: if a generator is generating 20MW and only 5MW is used where does the other 15MW goes? #11871
if generator is not operating on fullload it consumes basic fuel,and other resources,means you are not lossing 15MW of power but by not optimising generator you loss fuel required to operate 20mw instead of opeate 5mw generator,and fuel required to operate generator of 5mw in full load is less than fuel required to operate 20mw DG in 5MW load
Supposing I have 3phase power installation, 80A/phase, with 420V/phase as well, what is the calculation for generator to be installed as standby?
generator capacity always in KVA Your Connected Load = 1.73*420*80/1000=58KVA Approx.
You have to choose DG Capacity =62.5KVA If your power installation operation in full phase,ok