What is magnetising reactance?
Last Update: April 20, 2022
This is a question our experts keep getting from time to time. Now, we have got the complete detailed explanation and answer for everyone, who is interested!Asked by: Shaniya Rodriguez
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In circuit theory terms, the magnetising reactance is simply the reactance due to the self-inductance of the primary of the transformer. Its value reflects the magnetising current, as discussed later. ... resembles a transformer with two air-gaps in its magnetic circuit.
What is Magnetising reactance in induction motor?
The magnetizing reactance X0 in an induction motor will have a much smaller value. In a transformer, I0 is about 2 to 5% of the rated current while in an induction motor it is approximately 25 to 40% of the rated current depending upon the size of the motor.
What is meant by leakage reactance?
: the part of the reactance of a circuit that corresponds to the leakage flux.
What is meant by magnetizing inductance?
The generation of the magnetic flux inside the core by one set of current carrying coils and the transmission of the flux throughout the core is the first step in transformer action. The magnetization flux is created via a magnetizing inductance, Lm, which is placed in the primary of the transformer.
What is the relation between voltage and the magnetizing reactance?
The magnetizing reactance decreases as the iron becomes saturated with increased voltage. The resistance increases as the current increase causes the winding temperature to increase. The point is: we calculate the paremeters of equivalent circuit as ideally and in a specific contour conditions.
Practical Transformers - Winding Resistance, Leakage Reactance & Magnetizing Reactance
What is ideal transformer PDF?
Definition: The transformer which is free from all types of losses is known as an ideal transformer. It is an imaginary transformer that has no core loss, no ohmic resistance, and no leakage flux.
What is LV and HV side of transformer?
The test is conducted on the high-voltage (HV) side of the transformer where the low-voltage (LV) side or the secondary is short circuited. A wattmeter is connected to the primary. An ammeter is connected in series with the primary winding.
What causes hysteresis loss?
Hysteresis loss in a transformer occurs due to magnetization saturation in the core of the transformer. Magnetic materials in the core will eventually become magnetically saturated when they are placed in a strong magnetic field, such as the magnetic field generated by an AC current.
What is BH curve?
The B-H curve is generally used to describe the nonlinear behavior of magnetization that a ferromagnetic material obtains in response to an applied magnetic field.
What is meant by leakage inductance?
Leakage inductance in a transformer is an inductive component that results from the imperfect magnetic linking of one winding to another. In an ideal transformer, 100% of the energy is magnetically coupled from the primary to the secondary windings. ... This series inductance is the "leakage inductance."
What are the main assumptions for calculating leakage reactance?
The assumptions are: 1. The leakage flux distribution in the winding and the space between the windings must be in the direction of the winding axial. 2. The leakage flux is uniformly distributed along the length of the windings.
How do you find the leakage reactance?
X1 and X2 = leakage reactance of primary and secondary winding resp. Z1 and Z2 = Primary impedance and secondary impedance resp. Z1 = R1 + jX1 ...and Z2 = R2 + jX 2 .
What causes leakage reactance?
The winding leakage inductance is due to leakage flux not linking with all turns of each imperfectly-coupled winding. Leakage reactance is usually the most important element of a power system transformer due to power factor, voltage drop, reactive power consumption and fault current considerations.
What is power flow diagram?
The power flow diagram shows the losses of the motor. The input and output of the motor are explained in the power flow diagram. Three-phase voltage and currents are used for the input power of the motor.
What is no load test of induction motor?
The no-load test of an induction motor is similar to the open-circuit test of a transformer. The motor is not connected from its load, and the rated voltage at the rated frequency is applied to the stator to run the motor without a load. The 2-wattmeter method measures the input power of the system.
What is the working principle of induction motor?
Working Principle of Induction Motor
The motor which works on the principle of electromagnetic induction is known as the induction motor. The electromagnetic induction is the phenomenon in which the electromotive force induces across the electrical conductor when it is placed in a rotating magnetic field.
What is retentivity in BH curve?
Retentivity - A measure of the residual flux density corresponding to the saturation induction of a magnetic material. In other words, it is a material's ability to retain a certain amount of residual magnetic field when the magnetizing force is removed after achieving saturation.
What is coercivity and retentivity?
Coercivity is defined as the minimum value of magnetising intensity that is required to bring the material to its original state. ... This point is known as coercivity. The ability of the magnetic field remaining in the material even after removing the external source is known as Retentivity.
How can hysteresis loss be prevented?
How do we Reduce Hysteresis Losses? Hysteresis losses can be reduced by using material that has less area of the hysteresis loop. Hence, high grade or silica steel can be used for designing the core within a transformer because it has extremely less area of the hysteresis loop.
What is hysteresis in simple terms?
Hysteresis is something that happens with magnetic materials so that, if a varying magnetizing signal is applied, the resulting magnetism that is created follows the applied signal, but with a delay. ... As a general term, hysteresis means a lag between input and output in a system upon a change in direction.
What is meant by hysteresis loss?
Hysteresis loss is the energy which is wasted in the form of heat because of hysteresis. ... In order to overcome this internal friction, a part of magnetizing force is used which creates the heat energy. Since this heat energy generated is just wasted to oppose the internal friction, it is termed as hysteresis loss.
What is HV and LV?
HV/LV refers to the level of voltage within the electricity supply; this is either high voltage or low voltage. This infrastructure allows the electrical supply for various areas of a site to be altered depending on the requirements of the equipment.
What is HV and LV windings?
The HV winding is placed around the LV. ... If low voltage winding is placed near the core, the size and cost of the transformer reduce. In a core type transformer, the LV winding is always placed near the core. In a shell type transformer, HV and LV winding is interleaved alternately to reduce the leakage flux.
How can you tell if a transformer is LV and HV?
For, smaller size tapping transformers used in electrical or electronic devices, we can identify the LV and HV sides by observing the terminals. Generally, the HV sides contain only two terminals whereas the LV side contains more than two terminals.