TRANSFORMER THEORY

Transformers TRANSFORMER THEORY TRANSFORMER THEORY Transformers are used extensively for AC power transmissions and for various control and indication circuits. Knowledge of the basic theory of how these components operate is necessary to understand the role transformers play in today’s nuclear facilities. EO 1.1 DEFINE the following terms as they pertain to transformers: a. Mutual induction b. Turns ratio c. Impedance ratio d. Efficiency EO 1.2 DESCRIBE the differences between a wye-connected and delta-connected transformer. EO 1.3 Given the type of connection and turns ratios for the primary and secondary of a transformer, CALCULATE voltage, current, and power for each of the following types: a. D - D b. D - Y c. Y - D d. Y - Y Mutual Induction If flux lines from the expanding and contracting magnetic field of one coil cut the windings of another nearby coil, a voltage will be induced in that coil. The inducing of an EMF in a coil by magnetic flux lines generated in another coil is called mutual induction. The amount of electromotive force (EMF) that is induced depends on the relative positions of the two coils. Rev. 0 Page 1 ES-13