10-11-2012, 03:23 PM
Power Quality Aspects of Electric Traction
Power Quality Aspects.ppt (Size: 108.5 KB / Downloads: 37)
Out Line of the presentation
What is total power quality ?
International power quality standards.
Statutory requirements for IR.
Power quality control techniques.
Harmonics & voltage unbalance control.
Scenario on IR.
Internationally followed practices on total
power quality system.
Conclusion and recommendations.
Power Quality Definition
The term power quality is used to describe the extent of variation of the voltage, current and frequency on the power system. The variation of voltage and current can either be in terms of magnitude or waveform shape/distortion.
Power Quality Standards
IEEE 519, IEC 61000-3-2/4 for THD voltage and TDD i.e. current distortion limits at PCC for different power system voltages & fault levels and for different equipments respectively. IEEE 1159 describes Recommended practices for monitoring of power quality.
Performance standards like EN 50160 followed by EC, voltage un balance, harmonic distortion have been fixed for utilities. In UK for connection of non-linear equipments, ENA engineering guide G5/4-1 specifies harmonic limits.
For PCC > 33KV, to determine the distortion of the local network, system impedances data is used to construct a computer model, to show the effect of consumers’ network with local supply network.