Why the inductor and resistor are connected in parallel in a transformer why not in series?
in the transformer, the currents of the magnetization and loss components are different but the voltage that is responsible for the flow configuration and the hysteresis loss are the same. this is the reason behind the parallel connection of the inductance and resistance of the primary side of the transformer.
the shunt reactance representing the magnetizing part of the transformer consumes the magnetising component of the total current when empty and the shunt resistor representing the part causing the loss of core consumes the core loss component of the vacuum current. now, this shunt portion consumes a current called vacuum current and this current is present even when the load is connected to the transformer. now, the source of this vacuum current and the load current in the primary of the transformer is the same primary voltage although they are treated separately. thus, to show their separation from each other, the primary and shunt impedances of the primary are connected in parallel, but are shown as being connected to the same voltage source.
Well, the shunt resistor in the transformer equivalent circuit represents the loss that occurs in the core. the shunt inductance represents the magnetising component. in fact, as current flows through the primary winding, a portion of the total current is used to produce the working magnetic field and a portion of the current is used to dissipate heat into the transformer core. the magnetic field production is represented by a current called magnetization current passing through a pure inductor (shunt) producing the working magnetic field. core loss is represented by some heat dissipation due to the current flowing through a dummy resistor (shunt core resistance).
Now, as the total current entering the transformer primary, only a portion is consumed as a core loss component and magnetizing component; these components must therefore be shown separately from the remaining current flowing in series and is used for transfer. electrical energy from primary to secondary. and we know that the current is divided into two components in a network with two branches of derivation. thus, the parallel (parallel) representation allows us to separate the current magnetism and the core loss component from the total current remaining in the primary.