The document discusses standards for harmonic emissions in medium and low voltage power systems. It introduces the indicators used to determine power quality, including power factor and total harmonic distortion rate. It outlines standards from organizations like IEC and IEEE that limit harmonic emissions from equipment and within power distribution networks. These include limits on total harmonic distortion within networks. Basic and filtering solutions for mitigating harmonic pollution are also presented, such as passive filters, active filters, and hybrid filters. The conclusion emphasizes the economic and technical impacts of harmonics and the need to comply with standards to reduce harmonic pollution.

1. Algerian Democratic and popular Republic
The Ministry of Higher Education
And Scientific Research
University of
Skikda
Standards of Power Quality
armonic emissions in Medium and Low voltage)
Relased by:JEBRIL Bassem

2. The Plan
1/ Introduction
2/The indicators of energy quality
3/ Standards for harmonic emission in Medium and Low
voltage
4/ Maximum acceptable values of harmonics
5/The Solution to reduce harmonic pollution
6/ Conclusion

3. Introduction
Now a day's our life will be so comfortable thanks to the
technology but it not the same for our electrical network .it suffer
the harmonic pollution created by some technology that used the
non linear load, semiconductor power control, fluorescent
lighting and other source of harmonic…

4. More than 200 Billion € of financial loss per year
caused by energy problem quality
Power quality Problems causes significant financial losses and
bad technical impacts

5. Percentage of the Power Quality problems

6. indicators of energy quality
_The Power factor
_The Total Harmonic Distortion Rate
_The Harmonic spectrum
_The Factors of imbalance
These indicators are indispensable to determinate the Quality of Energy and to do
necessary corrective action.

7. Standards for harmonic emission in M/L Voltage
1/Standards governing compatibility between distribution networks and products
The harmonics caused by a device must not disturb the network beyond
certain limits.
(IEC=The International Electrotechnical Commission)
Standard IEC 61000-2-2 is applicable for public low-voltage power supply
systems.
Standard IEC 61000-2-4 is applicable for LV and MV industrial installations.

8. Standards for harmonic emission in MT / LV
2/Standards governing the quality of distribution networks
Standard EN 50160 (European Norm) stipulates the characteristics of electricity
supplied by public distribution networks.
Standard IEEE 519 presents a joint approach between Utilities and customers
to limit the impact of non-linear loads.

9. Standards for harmonic emission in MT / LV
3/Standards governing equipment
Standard IEC 61000-3-2 for low-voltage equipment with rated current under
16 A
Standard IEC 61000-3-12 for low-voltage equipment with rated current higher
than 16 A and lower than 75 A

10. Maximum limits of total harmonic distortion
rate en (%)

11. Maximum admissible voltage harmonic en (%)
for M/L voltage

12. The Solution to reduce harmonic pollution
Basic solutions to mitigate harmonics
1- Position the non-linear loads upstream in the system
2- Group the non-linear loads
3- Create separate sources
4- Use DELTA Coupling

13. The Solution to reduce harmonic pollution
Harmonic filtering solution
1. Passive filters
2. Active filters (active harmonic
conditioner)
3. Hybrid filters

14. 6/ Conclusion
Resonance, Increased losses, Overload on equipment, and
more economic impact are caused by the harmonic emission
,so we are obliged to apply and respect the requirement of
this standard to reduce harmonic pollution and preserve our
electrical network .

15. THANKYO
U
Any questions ?