How the leakage reactance of transformer varies with number of turns?

How the leakage reactance of transformer varies with number of turns?

Leakage reactance in a transformer is directly proportional to square of number of turns.

What is the leakage reactance in transformer?

Leakage reactance is measured by short-circuiting one winding of the transformer and increasing the voltage on the other winding until rated current flows in the windings. This voltage divided by the rated winding voltage, then multiplying by 100 results to percent reactance or %X.

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.

How the leakage reactance of a transformer is reduced?

Statement ( A ) : Flux leakage in a transformer can be minimized by winding the primary and secondary coils one over the other.

How do you find the leakage reactance of a transformer?

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 . E1 and E2 = induced emf in primary and secondary winding respectively.

How leakage flux depends on load current?

This flux is called leakage flux which will pass through the winding insulation and transformer insulating oil instead of passing through the core. This phenomenon in the transformer is known as magnetic leakage. This depends on load current, independent of voltage, frequency, and power factor.

What is reactance in a transformer?

The reactance of transformer is nothing but leakage reactance of transformer. This phenomenon in transformer is known as Magnetic leakage. Voltage drops in the windings occur due to impedance of transformer. Impedance is combination of resistance and leakage reactance of transformer.

What causes leakage inductance in transformer?

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.”

How do you find the reactance of a transformer?

Resistance and Reactance of the Transformer

1. Resistive drop in the secondary side = I2R2
2. Reactive drop in the secondary side = I2X2
3. Resistive drop in the primary side = I1R1
4. Reactive drop in the primary side = I1X1

What is leakage reactance test?

The field Leakage Reactance test is an AC (60Hz) short-circuit impedance test, which is performed. to detect mechanical winding movement and/or deformation within a power transformer.

On what factors leakage flux of a transformer depends?

This depends on load current, independent of voltage, frequency, and power factor.

How does leakage flux occur in a transformer?

This leakage flux is produced due to the primary amp turn (m.m.f) existing points a & b. Both leakage flux at primary and secondary fully depends on the load of the transformer. If the load increases, the leakage flux will also increase.

How does the leakage flux in a transformer depend on?

Due to this leakage flux in the transformer, both primary and secondary windings have leakage reactance. The reactance of the transformer is nothing but leakage reactance of the transformer. This phenomenon in the transformer is known as magnetic leakage. This depends on load current, independent of voltage, frequency, and power factor.

How is leakage reactance related to resistance of transformer?

This self-reactance of transformer is alternatively known as leakage reactance of transformer. This self-reactance associated with resistance of transformer is impedance. Due to this impedance of transformer, there will be voltage drops in both primary and secondary transformer windings.

Why are voltage drops due to leakage reactance?

Due to this leakage flux in transformer, both primary and secondary windings have leakage reactance. The reactance of transformer is nothing but leakage reactance of transformer. This phenomenon in transformer is known as Magnetic leakage. Voltage drops in the windings occur due to impedance of transformer.

What is the self reactance of a transformer called?

This self-reactance of transformer is called as leakage reactance of transformer. The resistance and leakage reactance in the winding is impedance (reverse and forward process).