1 http://www.pqnet.electrotek.com/pqnet/main/tech/intharm/ Interharmonics - 1 1999 IEEE T&D Show New Orleans Panel Session PN13 Non-periodic Currents: Causes, Effects and Identification Interharmonics in Power Systems Erich W. Gunther Electrotek Concepts, Inc.
5 http://www.pqnet.electrotek.com/pqnet/main/tech/intharm/ Interharmonics - 5 IEC Harmonic / Interharmonic Measurement Standard: IEC 61000-4-7 n Number of cycles to sample chosen to provide 5 Hz frequency bins 10 Cycles for 50 Hz Systems 12 Cycles for 60 Hz Systems n Grouping concept Harmonic factors calculated as the square root of the sum of the squares of the harmonic bin and two adjacent bins.