Which of the following loss in a transformer is zero even at full load?a)Core lossb)Friction lossc)Eddy current lossd)Hysteresis lossCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

Core loss, also known as iron loss or no-load loss, refers to the energy dissipated in the core of a transformer when it is operating at no-load or light-load conditions. Core loss consists of two components: hysteresis loss and eddy current loss.

Hysteresis loss is the energy dissipated due to the reversal of magnetization in the core material, while eddy current loss is the energy dissipated due to circulating currents induced in the core.

Both hysteresis loss and eddy current loss occur even when the transformer is not supplying any load. However, as the transformer is loaded and current flows through the windings, additional losses such as copper loss (due to resistance in the windings) and stray losses (due to leakage flux) come into play.

Friction loss, on the other hand, refers to the energy dissipated due to mechanical friction in the transformer, such as losses in bearings or rotating parts. Friction loss is not related to the transformer's core and is not present in a typical transformer operation. Therefore, the friction loss in a transformer is not zero even at full load.

Answer

Core Loss in a Transformer

Core loss in a transformer is primarily due to hysteresis and eddy current losses. However, at full load, the core loss is zero. Let's understand why this is the case.

Explanation:

1. Core Loss Components:
- Hysteresis Loss: This loss occurs due to the reversal of magnetization in the core material with each cycle of the alternating current. It results in energy dissipation in the form of heat.
- Eddy Current Loss: This loss occurs due to circulating currents induced in the core material by the changing magnetic field. These currents lead to resistive losses in the core.

2. Core Loss at Full Load:
- At full load, the transformer is operating at maximum efficiency, and the magnetic flux in the core is saturated. This saturation reduces the hysteresis and eddy current losses to almost zero.
- Since the core losses are proportional to the frequency and flux density, they decrease at full load due to saturation effects.

3. Effect on Efficiency:
- The reduction in core losses at full load contributes to the overall efficiency of the transformer. Lower losses mean less energy is wasted in the form of heat, leading to higher efficiency in power transfer.

In conclusion, core loss in a transformer is zero at full load due to saturation effects on hysteresis and eddy current losses. This phenomenon is essential for maximizing the efficiency and performance of the transformer during operation.

Similar Electrical Engineering (EE) Doubts

Which of the following mentioned losses occur in a transformer?

A 1 kV, 50 Hz supply to a transformer results in 650 W hysteresis loss and 400 W eddy current loss. If both the applied voltage and frequency are doubled, the new core loss would be

A 10000v, 25hz transformer has copper, hysteresis and eddy current losses of 1.5, 0.7and 0.4% of the output. the percentage losses if the transformer be used on a 20000v, 50hz system, assuming the full load current to be same?

In a given transformer for given applied voltage, losses which remain constant irrespective of load changes are

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