Jan 11, 2003 #1 insprian Electrical Jan 11, 2003 1 help...I can't remember the calaculation for fault current at the secondary of a 3 phase transformer.
help...I can't remember the calaculation for fault current at the secondary of a 3 phase transformer.
Jan 11, 2003 #2 cuky2000 Electrical Aug 18, 2001 2,133 Try the following simplified short cut method: Isc = Ifl/Zt Were: Ifl=KVAtransf/1.73xKV (Transf full load current) Zt = Z%/100 (Transformer impedance) Be ware that this method consider an infinte source on the primary side and do not include motor short circuit contribution from the secondary side. If you should be interested in more detail calc. consuly the IEEE Std 141 and 142. Upvote 0 Downvote
Try the following simplified short cut method: Isc = Ifl/Zt Were: Ifl=KVAtransf/1.73xKV (Transf full load current) Zt = Z%/100 (Transformer impedance) Be ware that this method consider an infinte source on the primary side and do not include motor short circuit contribution from the secondary side. If you should be interested in more detail calc. consuly the IEEE Std 141 and 142.
Jan 12, 2003 #3 jbartos Electrical Jan 15, 2000 6,440 Suggestion: Reference: 1. ANSI/IEEE Std 242-2001 Buff Book Upvote 0 Downvote
Jan 12, 2003 #4 busbar Electrical Apr 12, 2001 2,644 Administrative aside: There’s that upstart IEEE Draft Std P551 Calculating AC Short-Circuit Currents in Industrial and Commercial Power Systems An excerpt of the text is: standards.ieee.org/colorbooks/sampler/VioletBook.pdf Upvote 0 Downvote
Administrative aside: There’s that upstart IEEE Draft Std P551 Calculating AC Short-Circuit Currents in Industrial and Commercial Power Systems An excerpt of the text is: standards.ieee.org/colorbooks/sampler/VioletBook.pdf
