Transformer 1: 115Y/13.2delta, 20 MVA, X = 0.07 pu, nominal tap setting Transfor

Question

Transformer 1: 115Y/13.2delta, 20 MVA, X = 0.07 pu, nominal tap setting Transformer 2: 115Y/13.2delta, 15 MVA, X = 0.1 pu, nominal tap setting Load: 32 MVA, 13.2 kV, 0.8 lagging p.f. Find the magnitude of the current in per unit through each transformer and the MVA output of each transformer. What problem do you detect? Show that the problem can be resolved by appropriate use of the tap-changing facilities on one of the transformers. The following tap settings are available on the high voltage side of both transformers: nominal, plusminus 1.8%, plusminus 3.6%. For your calculations, use a base of 35 MVA and 13.2 kV on the low voltage side. Assume that the load voltage is maintained at 13.2 kV. The circulating-current method is satisfactory for this problem.

Explanation / Answer

When an electrical generator is in operation, it is capable of generating alternating current that can make the current circulate. The circulating current is just similar to a current flow that you can see in a river or even other water situation. The current circulates bWhen an electrical generator is in operation, it is capable of generating alternating current that can make the current circulate. The circulating current is just similar to a current flow that you can see in a river or even other water situation. The current circulates by moving back and forth between the two generator fields. When you want to design a generator set and also determine the placement and synchronization of generator, you have to know and understand the operation of circulating current, know the condition that can cause it to be more or less prevalent, plus also to understand the correct way to mitigate any of the effects provide by the circulating current. y moving back and forth between the two generator fields. When you want to design a generator set and also determine the placement and synchronization of generator, you have to know and understand the operation of circulating current, know the condition that can cause it to be more or less prevalent, plus also to understand the correct way to mitigate any of the effects provide by the circulating current.

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