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# Real Transformer - PowerPoint PPT Presentation

Real Transformer. 1- There are flux leakages 2- Some power loss (copper, core losses) 3- Limited permeability . Let’s see what effects these realities would have on voltage and current relation of the primary and the secondary. Q:Can we modify the ideal transformer model to take these

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Presentation Transcript

1- There are flux leakages

2- Some power loss

(copper, core losses)

3- Limited permeability

Let’s see what effects these realities would have on voltage and

current relation of the primary and the secondary

Q:Can we modify the ideal transformer model to take these

realities into account?

A: Yes

Now with flux leakage

A: Yes, we can count for flux leakage using this

equivalent circuit

The same for secondary

2-1- Copper loss

3- Limited permeability

In ideal transformer:

That means in ideal transformer, if the current in the secondary

is zero (no load), the current in the primary should be zero as well

That means in real transformer, if the current in the secondary

is zero (no load), the current in the primary is not zero

Magnetization current

Real Transformer Model

Using phasor

The original equivalent circuit

Referred to the primary

Referred to the secondary

If we assume that the current in Rc and XM would not change much if we change its place,

These models are too simplified, the original model is too complicated, we usually work with these models

Referred to the primary

Referred to the secondary

Open-circuit test

Short-circuit test

Q: Given six values, how can we determine the parameters of the equivalent circuit

From open-circuit test,

Short circuit test the equivalent circuit

In Summary secondary components

Given:

If the test is done on the primary

For the equivalent circuit referred to the primary

Two Obtainable Equivalent Circuit secondary components

To obtain the equivalent circuit referred to secondary,

Divide the parameters by the turn ratio square

Example secondary components

Equivalent circuit secondary components

Referred to the primary

Given:

8000/240

Equivalent circuit

Referred to the secondary