Autotransformers

Question 1

Describe transformed apparent power

Answer 1

1. The product of the rated common winding voltage times the rated common winding current

Question 2

Describe conducted apparent power

Answer 2

1. The product of the rated common winding voltage times the rated series winding current

Question 3

Name the 3 advantages of an autotransformer

Answer 3

1. Ideal for small voltage changes
2. Smaller in size and lower in cost for the same rating when compared to a mutual induction
3. They have a better percent voltage regulation

Question 4

Name 3 disadvantages of an autotransformer

Answer 4

1. They do not isolate the secondary circuit from the primary circuit
2. They have a higher available short circuit current
3. If the common winding becomes open circuited, source voltage will be applied directly to the load