Harmonics What effects could be experienced as a result of harmonics within 1) s

Question

Harmonics
What effects could be experienced as a result of harmonics within
1) star transformer systems 2) delta transformer systems 3) a.c motors
4)Describe the term K factor
5) To imrove the power factor a capacitor bank has been installed. What effects would this have on the harmonics
Harmonics
What effects could be experienced as a result of harmonics within
1) star transformer systems 2) delta transformer systems 3) a.c motors
4)Describe the term K factor
5) To imrove the power factor a capacitor bank has been installed. What effects would this have on the harmonics
Harmonics

1) star transformer systems 2) delta transformer systems 3) a.c motors
4)Describe the term K factor
5) To imrove the power factor a capacitor bank has been installed. What effects would this have on the harmonics
1) star transformer systems 2) delta transformer systems 3) a.c motors
4)Describe the term K factor
5) To imrove the power factor a capacitor bank has been installed. What effects would this have on the harmonics

Explanation / Answer

The effects of the harmonic currents are

1. Additional copper losses due to harmonic currents

2. Increased core losses

3. Increased electro magnetic interference with communication circuits.

On the other hand the harmonic voltages of the transformer cause

1. Increased dielectric stress on insulation

2. Electro static interference with communication circuits.

3. Resonance between winding reactance and feeder capacitance.

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1.Yy connection without neutral wires:

Yy connection with neutral wires:

When a neutral wire is provided the triplen harmonic current can flow and the condition is similar to the single phase case (with a star connected 4 wire source or with the system earth). The neutral wire carries three times the triplen harmonic current of one transformer as these currents are co-phasal. Unloaded secondary neutral will not be operative.

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2.Dd connection:

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3. Generators and motors are adversely affected by harmonics. Typical effects are:

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4. K-factor for an electrical network primarily relates to non-linear loads and is defined as a number representing the effect of harmonics on heating of transformer.

The “K” factor has been established to define the ability of a transformer to serve varying degrees of nonlinear load current without exceeding the rated temperature rise.

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5.Effects of harmonics on capacitors:

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