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Dynamic ratings, based on continuous load and temperature measurements and identification and updating of key parameters affecting thermal performance, result in values that are typically higher than book ratings for both normal and emergency conditions. Additionally, and just as important, these real-time ratings are both accurate and safe, dramatically reducing the possibility of overheating and seriously damaging major power delivery system components. As dynamic rating systems allow equipment temperatures to more closely approach defined temperature limits, the dielectric materials used will be subjected to higher temperatures, both for normal and emergency conditions, for longer periods of time. This might effect the actual long-term performance of some of the dielectric insulation systems used today.