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As economic pressure builds to fully utilize the capacity of existing power equipment, dynamic rating systems allow for informed decisions about circuit load limits. Dynamic thermal ratings offer a way to increase capacity under most weather- and load conditions while reducing the risk of failure under unfavorable conditions. EPRl's Dynamic Thermal Circuit Rating (DTCR) system makes thermal information readily available and provides a solid basis for higher equipment utilization. DTCR calculates dynamic thermal ratings (real-time ampacities) of power equipment based on actual load and weather conditions that are generally accessed through the utility's SCADA/EMS system. Given series or parallel combinations of equipment, the software determines dynamic circuit ratings by evaluating all equipment ratings on a circuit and finding the most limiting ampacity for each rating scenario. Dynamic ratings offer two key benefits over traditional static ratings: (1) higher loading of equipment is usually possible using actual measured load and weather parameters; traditional static ratings are overly conservative, since they are based on worst-case weather and load assumptions; and (2) a better understanding of equipment thermal response is achieved. This results in increased reliability.
Douglass et al. (2000) studied this question.