Determination of harmonic emission: problem of higher frequencies Paper 32 & 37 of session 2: determination of a customer emission level Algorithms are very sensitive to measurement precision (magnitude and angle harmonics)

Harmonic emission of network user with 2 arc furnaces connected in 150 kV network Estimation of the source impedance Zs with method Re(DV/DI) described in paper s2-32: good results until 5th harmonic Customer impedance Zc was determined by simulation (= impedance of filter installations) Approach described in paper s2-37 to determine the dominant factor was applied

125 Hz

250 Hz

Question to the authors What is the experience of the authors with the application of the described approaches in practical circumstances at higher harmonics orders (above 500 Hz – frequency response VT’s & CT’s in magnitude and angle)?