Question

If one transformer of a closed delta bank is removed during an outage to restore service, the remaining two can handle ______% of the original capacity.

a. 33.3
b. 50
c. 66.6
d. 75

Answer 1

When one transformer of a closed delta bank is removed, the remaining two transformers can handle 66.6% of the original capacity.

Step-by-step explanation:

When one transformer of a closed delta bank is removed, the remaining two transformers can handle 66.6% of the original capacity. This is because the capacity of a closed delta bank is distributed evenly among the transformers in the bank. With one transformer removed, the remaining two transformers will share the load equally, resulting in each transformer handling 33.3% of the original capacity. Since there are two remaining transformers, the total capacity they can handle is 66.6% of the original capacity.