Transformer Equivalent Circuit

[Jacky]

Here is my question.

It is rather simple quetion. But I am a beginer in this field so please help me.

In the case of equivalent ciruit of the tranformer it is taken that the inductance and the capacitance in the primary coil of the transformer is taken parrallel and the inductance and capacitance of the secondary coil tranfered to the primary are taken parrallel. Could you please explain to me the actual reason behind it?

 

[stewartcs]

Here is my question.

It is rather simple quetion. But I am a beginer in this field so please help me.

In the case of equivalent ciruit of the tranformer it is taken that the inductance and the capacitance in the primary coil of the transformer is taken parrallel and the inductance and capacitance of the secondary coil tranfered to the primary are taken parrallel. Could you please explain to me the actual reason behind it?

Generally speaking, equivalent circuits are used to simplify a complex circuit into terms that are solvable with known relations. For example, in a transformer equivalent circuit you can account for winding losses and flux leakage with a series resistance and reactance on the primary side. Core losses can be modeled similarly with a parallel resistance and reactance on the primary also.

Essentially when reflecting/referring an impedance to the primary side of a transformer, you are just seeing what the secondary impedance "looks like" to the primary side. Since the secondary impedance will determine the load on the primary, it is helpful to know how to relate it in terms of the primary so as to calculate the current flow in the primary due to the load on the secondary.

Hope that helps.

CS

 

[oswaler]

The reason for considering the inductance and capacitance in the primary coil of a transformer as parallel is because they are both connected to the same power source. This means that the voltage across both components will be the same and they will share the same current. In a parallel circuit, the voltage across each component is the same, but the current is divided between them. This is similar to how the primary coil of a transformer works, where the voltage is stepped down or stepped up, but the current remains the same.

The same concept applies to the secondary coil, where the inductance and capacitance are also considered in parallel. This is because the secondary coil is connected to the load, which will also have a certain level of capacitance and inductance. By considering them in parallel, we can accurately represent the behavior of the transformer and its effect on the load.

It is important to note that this equivalent circuit is a simplified representation of the actual transformer, as there are other factors that can affect its performance. However, for basic analysis and understanding, considering the inductance and capacitance in parallel is a valid approach.

I hope this explanation helps clarify the reasoning behind the equivalent circuit of a transformer. As a beginner in this field, it is important to continue learning and exploring the various concepts and principles involved in transformer theory.