Understanding Transformer Core Loss under Increasing Load on Secondary

In summary, increasing load on the secondary will increase the current in the primary. This increase will cause increased I*R loss in the primary, which will decrease the volt-seconds seen by the core. Since the flux in the core is proportional to the volt-seconds applied by the primary, the core flux will decrease, resulting in less core loss.
  • #1
neduet
64
0
1.If we increasing load on secondary of transformer core loss is same or not ?

2.what is the most common lamination thickness of transformer core?

3.some kind a paper we used in winding for insulation what is the name of this material?
 
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  • #2
In number one, are you asking about the loss in the core or the total circuit? The only way the loss in the core is going to increase is if you increase windings in the secondary.
 
  • #3
neduet said:
1.If we increasing load on secondary o-f transformer core loss is same or not ?

2.what is the most common lamination thickness of transformer core?

3.some kind a paper we used in winding for insulation what is the name of this material?

1. Increasing load on the secondary will increase the current in the primary. This increase will cause increased I*R loss in the primary, which will decrease the volt-seconds seen by the core. Since the flux in the core is proportional to the volt-seconds applied by the primary, the core flux will decrease, resulting in less core loss.

2. The most common lamination thickness is .014 inches.

3. The most common modern material is nomex, a synthetic paper.
http://en.wikipedia.org/wiki/Nomex
 
  • #4
For a conventional power transformer operating at 50 or 60 Hz, the core (magnetization in laminations) loss can increase only when

a) The primary voltage is increased (don't use a 120 Vac transformer on 220 Vac)

b) the primary frequency is decreased (Don't use a 60 Hz transformer on 50 Hz unless the mfgr states 50/60 Hz)

c) the number of primary turns is decreased (decreases inductance).

The core loss is determined entirely by the design of the transformer as an inductance w/o a secondary winding. The core probably goes up to ~1.4 Tesla peak; any increase will significantly increase losses.
Bob S
 
  • #5
Thanks A lot Bob S and ernestpworrel (sorry for late)
 

1. What is a transformer core?

A transformer core is a magnetic component that is used in electric transformers to transfer electrical energy from one circuit to another through electromagnetic induction.

2. What are the different types of transformer cores?

The most common types of transformer cores are laminated, toroidal, and ferrite cores. Laminated cores are made of stacked thin sheets of iron, while toroidal cores are circular or ring-shaped. Ferrite cores are made of a ceramic material with high magnetic permeability.

3. What is the purpose of a transformer core?

The main purpose of a transformer core is to provide a low reluctance path for the magnetic flux generated by the primary winding of a transformer. This allows for efficient energy transfer between the primary and secondary windings.

4. How does the material of the transformer core affect its performance?

The material of the transformer core affects its performance in terms of its magnetic properties, such as permeability, hysteresis, and eddy current losses. A core made of a material with high permeability will have better flux-carrying capacity, while materials with low hysteresis and eddy current losses will result in higher efficiency.

5. Can a transformer operate without a core?

No, a transformer cannot operate without a core. The core is an essential component that creates a closed magnetic circuit and allows for efficient energy transfer between the primary and secondary windings. Without a core, the transformer would not be able to step up or step down the voltage as needed.

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