- 1 The Utility Company Supplies Two Single Phase Transformers Banked In An Open Delta If Each Transformer Is Rated 75 K 1 (70.56 KiB) Viewed 28 times
1. The Utility Company supplies two single-phase transformers banked in an open delta. If each transformer is rated 75-kVA capacity, what is the maximum 3- phase load in kilowatts that the bank can carry without suffering overload considering that the load has a lagging power factor of 0.80. Answer: PL 104 kW 2. Three-single phase transformers each rated 75 kVA are banked in the delta and supplying a 3-phase load drawing 160 kVA at 0.8 lagging power factor. If one transformer is removed for repairs, solve for the amount of overloading of the remaining units. Answer: Overload ≈ 30 kVA 3. The MERALCO has two single-phase transformers with equal turns ratio and ratings and are operated in parallel to supply a load of 280 kW at 0.80 lagging pf. Transformer A has a resistance of 2% and a reactance of 8%. Transformer B has a resistance of 1% and a reactance of 6%. Determine the power delivered by the transformers A and B to the load. Answer: PA 123 kW and PB≈ 157 kW