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We are using Powerica make 100 KVA DG set. Whenever i
connect compressor on DG load (Compressor Make Atlas Copco
5.5 kva) that time we face the lot of fluctuation on Dg
output. Can you please suggest me how can prevent this
fluctuation?
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Answer Posted / prajeshkumarbe@yahoo.com
hai to all..,
this is the wonderful question, powerica DG is another
company of Caterpillar .atlas copco also best compressor
designer.
ur Dg is 100KVA , load is 5.5KW (its not a 5.5kva) that
means 7.5 hp,
while getting the fluctuation note it below.,
1.whether fluctuation is comes while starts r stops(loading/
unloading)
2.fluctuation time wt is the pressure (if compressor
reaches maximum working pressure it will takes more current)
3.normally it will be enough DOL Stater ,if its take more
current while start /stop,just u make the Star Delta
stater , surly will get best result.
4.check the DG fuel filter condition ,if its ran above 300
running hrs replace newly
5.DG should be run 80% load max ,
6. give the DG load only compressor itself and measure the
performance
7.ensure the compressor max pressure switch properly working
8.in DG AVR (Automatic voltage regulator) system may failure
9.check the self exciting system rectifier diodes
thanking u all
Rajesh
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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 THE CURRENT CARRYING CAPACITY OF 2.5/3 CORE HI TUFF CABLE,WILL IT SAFLEY CARRY 8.6 AMPS OVER 120 METRES,CAN YOU ALSO ANSWER WITH FORMULA FOR WORKINGS OUT ,THANK YOU 3RDYR APPRENTICE.
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