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How to calcute the cable size for both HT and LT please
specify the formula for that
Regards
Chethan C
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Answer Posted / kanchan dogra
Selection of HT cable is based on
1. short circuit calculation
2. Full load current capacity
1. Short Ckt. calculation
if total load is 3000 KVA, V 11 KV
short ckt MVA on HV side = 350 MVA (As per standard practice)
short ckt. current Ik= MVA/root3 x KV
350/root3 x 1= 18.4 KA
duration of short Ckt= 1 Second
cross section area of the conductor = Ik x root T/.094
18.4x root T/.094 = 95 SQ.mm
2. Full Load current
Total Load= 3000 KVA
System Voltage= 11 KV
Full load current = KVA/ root3 x KV
3000/root 3 x 11= 157 Amp.
derating factor = .7
current carrying capacity after derating = 157/.7 = 224.95 AMP.
Hence select cable for this current.
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WHAT SHOULD BE THE BEST CURRENT RATINGS (PRIMARY / SECONDARY)FOR A CT INSTALLED AT THE INCOMING 11KV PANE? WILL IT BE CALCULATED ON THE BASES OF MAXIMUM DEMANT VALUE OR ON SUM OF ALL TRANSFORMER'S KVA? NOMALLY MAX DEMAND REPRESENT THE MAXIMUM OPERATING LOAD OF THE PLANT AND TOTAL KVA OF (SAY 5 NUMBERS TRANSFORMERS) REPRESENT THE CONNECTED LOAD. WHICH i.e. MAX DEMAND KVA OR CONNECTED KVA ARE BETTER TO USE FOR CT CURRENT CALCULATION? PLEASE ANSWER.
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