The shown distribution network is to supply two factories A & B with load curves indicated. Assume that both factories have a lagging power factor of 0.8 . a) Select the required sizes of transformers...

Sub:electrical distribution


Extracted text: The shown distribution network is to supply two factories A & B with load curves indicated. Assume that both factories have a lagging power factor of 0.8 . a) Select the required sizes of transformers for both factories such that in the case of a failure in one transformer the overload on the remaining ones should not exceed 15% . b) Select the required sizes of fuses to be installed at both sides of transformers. c) Calculate the annual energy losses in transformers of factory A. Assuming that transformers are in operation continuously . d) Select the required size of the 11KV. XLPE cables for the distribution network , if cables are to be laid direct in ground with maximum ground temperature of 30° C. e) Calculate the annual energy losses in cables of section SA . S 2 Km 3 Km 11/0.4 KV Trans. 11/0.4 KV Trans. Factory A PF = 0.8 lag. Factory B PF = 0.8 lag. | S (KVA) 500 S (KVA) 500 400 400 300 300 200 200 100 100 Time (hr) 24 Time (hr) 24 12 18 6 12 18 Load curve of Factory (A) Load curve of Factory (B)