how to select short circuit current while selecting a MCCB?
how to calculate current for a given KVA and KW load?
Answers were Sorted based on User's Feedback
Answer / john
FOR A 1000KVA TRANSFORMER.
PRIMARY VOLTAGE=15000V=15KV
SECONDARY VOLTAGE=480V=.48KV
impedence =5.75%
short circuit current at primary=1000/15*1.73*.0575=670amps.
short circuit current at
secondary=1000/.48*1.73*.0575=20943amps.
Is This Answer Correct ? | 30 Yes | 8 No |
Answer / prashant
The basic equation is
P= 1.732VICos(A) WHERE P = load in KW
If in KVA then convert it to KW
KW = KVA * Cos(A)
V=415
well i dnt knw regarding the short ckt selection of MCCB
Is This Answer Correct ? | 2 Yes | 13 No |
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