Transformer Losses

Transformer Losses

‘What are the 4 types of Losses in a Transformer?

• Iron or Core Losses

• Copper or Ohmic Losses

• Stray Losses

• Dielectric Losses

What are the 2 types of losses with an Iron Or Core

• Hysteresis

• Eddy Current Losses

What are the 3 mains reasons for Hysteresis Losses?

• Losses due to the magnetization and demagnetization of the core

• Energy is lost in each cycle as the magnetization is reversed

• Reduced by manufacturer using low reluctance core materials

What are Eddy Currents

• What the Magnetic flux influences the core

• Eddy currents flow in a circular manner and provide no productive power

How can eddy currents be reduced

• use a laminated core instead of a solid core

What are the benefits of a laminated core

• Reduces Eddy currents

• Reduces heat within the core

What are Copper Losses

• Transformer Copper Losses due to electrical resistance in the windings (primary and secondary)

Can both Copper and Aluminum wire have losses?

• Yes, Losses are caused by the resistance in the wire

When load is connected, the current in the windings cause power loss known as what?

• I2R losses (2=squared)

What cause larger I2R losses (2=squared)

• Larger wire

How can Copper losses be reduced

• Use larger Wire (less resistance= less heat)

• Better Cooling

What causes Stray Losses?

• Stray losses are due to the leakage field in the transformer

What are 2 types of Stray Currents

• Eddy currents in the walls of the transformer

• Eddy Currents in the Winding Conductors

When does Dielectric loss happen

• Loss occurs due to failing insulation value of the transformer

Losses due to Leakage Flux are?

• Flux that does not cross the conductor cannot produce a voltage

How doe leakage flux impact a transformer efficiency?

• Leakage flux reduces transformer efficiency

How can Leakage Flux be reduced

• Placing the primary and

  secondary windings on the

  same leg of the core.