06 March 2013

Harmonics Disadvantages in Power System

Sources of Harmonics:

Several sources of harmonic currents that may be found on electrical power distribution networks are listed below:
  • Variable speed motor drives
  • Rectifiers
  • Arc furnaces
  • Wielding equipment
  • Uninterrupted power supplies
  • Switching mode power supplies
  • Compact fluorescent lamps
  • Electronic ballasts

Disadvantages of Harmonics:

Harmonics degrades the performance of power system. Some of the disadvantages of harmonics in the power distributed network are listed below:
  • The harmonics flowing in the distribution network downgrade the quality of the electrical power supply. There can have several negative effects on the operation of the power system
  • Increased losses on the distribution system due to increase in the effective rms current
  • Over-load in neutral conductors due to cumulative increase in the third harmonics created by the single phase loads
  • Overloads, vibration and premature ageing of the generators, transformers and motors as well as increase in the noise level
  • Overloads and premature ageing of the power factor correction capacitors
  • Distortion of the supply voltage that can disturb the operation of the sensitive loads
  • Disturbances in the communication networks and telephone lines
  • Resonance between the supply inductance and capacitance of the power factor correction capacitors

1 comment:

Omprakash said...

I like your blog, you shared valuable information about in Harmonic distortions are one of the most common and irritating problems in industrial environment. We need to identify the source of harmonics and suppress them for a quality supply of power. Please visit Harmonic Analysis