1 Tr=12000 BTU=3024Kcal
To obsorv 3024 kCal Heat in Temp.diff Of 37(Amb)-23
(Required)=14 c It consumped 4 Hp Energy.
Then Amp=w/1.732*0.8*415 In 3 Phase
COP = cooling capacity / compressor power; COP = 2.5 for
typical Direct Expansion AC units. Substitute the COP
value, 2.5 = Ton cooling/ kWcomp; or kWcomp = Ton
cooling / 2.5. Multiply Ton by 3.517 to convert it into kW
cooling. kWcomp = (3.517 / 2.5) x Ton; kWcomp = 1.4 x
Ton. This kWcomp is approximately equal to the system kW
based on AC units catalogs. MCA = (1.4/0.8 x Ton) / Voltage-
phase or MCA = 1.75 x Ton / Voltage-phase
there is a power transformer 66/11kV in delta-delta
connection has 5 feeder coming out from the secondary side.
One of the feeder in it normally loaded (loaded than other
feeder)and this feeder usually trips with double OCR causing
the bank transformer to trip. Now if the load of this feeder
is put on other transformer then that no problems occurs on
that transformer or the load. However normally all the
test(IR, PI, short ckt, open ckt,grounding test and other )
has been conducted for this but evertything transformer.....
I am not geting what is the actual problem...