What cable size I require to connect a 500 KVA, 11/.415 KV Transformer to 11 KV Distribution Line. What factors are required to be considered in selection of the HT Cable.
2007-02-09 07:54:05 · 2 answers · asked by Hbb_1975 1 in Science & Mathematics ➔ Engineering
While calculating, please consider the short circuit loading, assuming the source impedance to be zero and transformer impedance to be 4%. Short circuit current would be symmetrical and staedy state condition, with referred time 3 sec.
2007-02-12 07:22:40 · update #1
The current capability of the wire is the biggest concern. In a distribution system, to reduce resistance losses, higher voltages are used at reduced amperage levels.
Insulation resistance needs to be considered. Corona effect around the wires is a point of consideration, as is distance from any ground point. Keeping people away is a consideration. An arc could be attained by an intermediate object, so this has to be considered for where this equipment will be located. Based on experience, a number 8 size wire would do, but I would most likely choose a number 6 size wire with considerations for surge.
2007-02-09 09:39:36 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Look it up in the NEC - National Electrical Code.
Or pay an engineer to do the work to make sure you don't melt something or burn something down. 500 KVA is a bit much to be sizing from suggestions. I hope you live where an inspector will check up on your work.
2007-02-09 08:37:17 · answer #2 · answered by MarauderX 4 · 1⤊ 0⤋