Application of ieee std 519-1992 harmonic limits

Application of IEEE Std 5191992 Harmonic Limits
Thomas Blooming, P.E. Daniel J. Carnovale, P.E. IEEE IAS Atlanta Section September 17, 2007

IEEE IAS 52nd Pulp & PaperAppleton, Wisconsin June 19, 2006

Outline
• • • • • • • Introduction Harmonic Limits Point of Common Coupling (PCC) ISC/IL Ratio Total Demand Distortion (TDD) Harmonic LimitEnforcement Conclusion

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Introduction
• Harmonics cause problems in power systems • IEEE Std 519-1992 provides a basis for limiting harmonics • Harmonics basics
–Voltage or current harmonics? Be clear! – Add in a “root-sum-square” fashion – Usually expressed as % of fundamental – Often better to express as Volts or Amps

Outline
• • •• • • • Introduction Harmonic Limits Point of Common Coupling (PCC) ISC/IL Ratio Total Demand Distortion (TDD) Harmonic Limit Enforcement Conclusion

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Harmonic Limits
•Utility is responsible for providing “clean” voltage • Customer is responsible for not causing excessive current harmonics • Utility can only be fairly judged if customer iswithin its current limits

Harmonic Limits
Voltage Distortion Limits
Bus Voltage at PCC 69 kV and below 69.001 kV through 161 kV 161.001 kV and above Individual VoltageDistortion (%) 3.0 1.5 1.0 Total Voltage Distortion THD (%) 5.0 2.5 1.5

NOTE: High-voltage systems can have up to 2.0% THD where the cause is an HVDC terminal that willattenuate by the time it is tapped for a user.

• Stricter limits at higher voltage • Individual harmonics limited to lower levels than THD

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Harmonic Limits
CurrentDistortion Limits for General Distribution Systems (120 V Through 69000 V)
Maximum Harmonic Current Distortion in Percent of IL Individual Harmonic Order (Odd Harmonics) ISC/IL