Two identical single-phase 200 kVA, 220/440 V are supplying a three-phase load at 440 V in...

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Two identical single-phase 200 kVA, 220/440 V are supplying a three-phase load at 440 V in open-delta mode. The power factor of the load is 0.7 lagging. Calculate the following: (a) The maximum secondary side-line current without overloading the transformer. (b) The amount of real power delivered by each transformer. (c) The primary side-line current. (d) A third identical transformer is now added to complete the closed-delta. Calcu- late the percentage increase in real power supplied. Assume that the load voltage and pf remain same as 440 V and 0.7 pf lagging. Two identical single-phase 200 kVA, 220/440 V are supplying a three-phase load at 440 V in open-delta mode. The power factor of the load is 0.7 lagging. Calculate the following: (a) The maximum secondary side-line current without overloading the transformer. (b) The amount of real power delivered by each transformer. (c) The primary side-line current. (d) A third identical transformer is now added to complete the closed-delta. Calcu- late the percentage increase in real power supplied. Assume that the load voltage and pf remain same as 440 V and 0.7 pf lagging.

Answer rating: 100% (QA)

a Maximum Secondary Power Delivered by Each Transformer The real power P delivered by each transformer can be calculated using the formula P sqrt3text... View the full answer