Comparison of several methods for calculating power line electromagnetic interference levels and calibration with long term data

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Abstract
Five different methods for predicting foul-weather electromagnetic interference from power lines have been studied. Differences between the predictions in excess of 10 dB are common. Each method has been optimized by adding a constant chosen to minimize the difference between predictions and a set of long-term measurements. The rationale for doing this is that each generation function was developed under somewhat different weather conditions. The best optimized method is the one with the smallest difference. The best methods have, respectively, 1.7 and 4.4 db RMS differences between average stable foul and average fair-weather measurements.