Electrical Power 2: Three Phase Transformers

What is Excitation Current?

The DC supplied to the field

Three-phase power:

The most common way in which power is produced, transmitted, and used

The construction of a Three-Phase transformer:

Three single-phase transformers are winded on the same core with a primary and a secondary

Three-Phase Transformers are used for:

To change values of three-phase voltage and current

Three factors that determine the output voltage of a generator:

1.) Amount of coils 2.) Strength of magnetic field 3.) Speed of cutting action

What 3 things is Dielectric oil used for?

1.) Provides insulation (between windings and case) 2.) Provides cooling 3.) prevents moisture

How many degrees apart is Three-Phase Power?

120° Degrees

An Open-Delta configuration:

Can be made with only two transformers instead of three.

What happens to current in a wye configuration?

Current remains the same.

The two main types of transformer connections:

Delta or Wye configurations

3 things used to produce voltage:

MOTION, FLUX, CURRENT

What is a Three-Phase Bank used for?

Used if three-phase transformer of the proper size and turns is not available

When can you connect a transformer in a wye-wye?

When the incoming power line has a neutral conductor

What is Armature?

Where A/C is produced; the component that carries A/C