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When transformer is ideal then the magnetizing current and working current are?
In the ideal transformer the current value is zero. In non-ideal transformers this current is greater than zero. This current is known as the magnetizing or exciting current. The induced secondary voltage, Vs equals the number of secondary turns times the induced voltage per turn. or equivalently, Vs = Ns x Vp / Np.
What are the characteristics of an ideal transformer?
In an ideal transformer, it is assumed that entire amount of flux get linked with secondary winding (that is, no leakage flux). 100% efficiency: An ideal transformer does not have any losses like hysteresis loss, eddy current loss etc. So, the output power of an ideal transformer is exactly equal to the input power.
Which is true for an ideal transformer?
An ideal transformer has infinite primary and secondary inductances. Explanation: The primary and secondary windings have zero resistance. It means that there is no ohmic power loss and no resistive voltage drop in the ideal transformer.
Which of the following is not features of an ideal transformer?
The resistances of the primary and secondary winding are zero. The core of the ideal transformer has infinite permeability. The leakage flux in the transformer core is zero.
Why the transformers are rated in kVA and not in kw?
The copper loss depends on the current (ampere) flows through the windings of the transformer while the iron loss depends on the voltage (volts). i.e., the rating of the transformer is in kVA.
What is the function of transformer?
A transformer is an electrical device designed and manufactured to step voltage up or step down. Electrical transformers operate on the principle of magnetic induction and have no moving parts.
What is the current of a non ideal transformers?
In non-ideal transformers this current is greater than zero. This current is known as the magnetizing or exciting current. The induced secondary voltage, Vs equals the number of secondary turns times the induced voltage per turn. or equivalently, Vs = Ns x Vp / Np.
When do you need an exciting current in a transformer?
FIGURE 1 Geometrical construction of transformer exciting current. Starting at t = 0 (the point indicated by 0), the flux is zero and increasing. Going over to the ɸ vs. I hysteresis loop, we find that when the flux is zero and increasing, some exciting current is required (also indicated by a 0).
What is the current value of a transformer?
The induced primary voltage limits the flow of primary current. In the ideal transformer the current value is zero. In non-ideal transformers this current is greater than zero. This current is known as the magnetizing or exciting current.
What makes an ideal transformer 100% efficient?
An ideal transformer has no parasitic losses (no core loss, no winding resistance, and no leakage inductance). Ideal transformers are 100% efficient. An ideal transformer has infinite input impedance hence the ideal transformer does not draw any current for itself.