[BASIC]How To Calculate 33/11 KV Carry Line
Edited by KILL_NANCY at 27-4-2018 04:02 AMCALCULATION 33KV / 11KV CARRY LINE
If details are :
V : 415
PF : 0.9
CT KVA : 1000
FORMULAE
KW : KVA X PF
KW : 1000 X 0.9
KW : 900
11KV PRIMARY CURRENT
KW : Root (3) X KV X I X PF
900 : 1.732 X 11 X I X 0.9
900 : 17.1468 X I
900/17.1468 : I
52.49 : I
I : 52.49A
415V SECONDARY CURRENT
WATTS : Root (3) X V X I X PF
900 X 1000 : 1.732 X 415 X I X 0.9
900000 : 646.90 X I
900000/646.9 : I
1391.3 : I
I : 1391.3A
RATING OF TRANSFORMER 1000 KVA
Primary Voltages on High Voltages sided is : 11KV
Primary Current on High Voltage i : 52.49A
Secondary Voltages on Low Voltages sided is : 415V
Secondary Current on Low Voltage is : 1391.3A
Transformer rating in KVA : 1000KVA
Primary Voltages : 11KV
Primary Current : 52.49A
Secondary Voltages : 415V
Secondary Current : 1391.3A
CALCULATION FOR THE RATING OF TRANSFORMER ACCORDING TO :
P : V X I (Primary Voltage X Primary Current)
P : 11000V X 52.49A = 577390VA = 577.39KVA
AND
P : V X I (Secondary Voltage X Secondary Current)
P : 415V X 1391.3A = 577390VA = 577.39KVA
P : Root (3) X V X I
P : Root (3) X Primary Voltage X Primary Current
P : 1.732 X 11000V X 52.49A = 1000039.48VA = 1000 KVA
P : Root (3) X Secondary Voltage X Secondary Current
P : 1.732 X 415V X 1391.3A = 1000038.6VA = 1000 KVA
RATING OF THE THREE PHASE TRANSFORMER
Voltage (line to line) : 208V
Current (line current) : 1391.3A
P : Root (3) X V X I
P : 1.732 X 208V X1391.3A
P : 501224.2VA
P : 501 KVA / 500 KVA
ABBREVIATIONS
PF : Power Factor
I : Amperage
KV : Kilo Volt
KW : Kilo Watt
V : Volt
KVA : Kilo Volt Ampere
CT : Current Transformer
P : Power
VA : Voltage Ampere
KILL_NANCY
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