Consideration of Degradation Factors Affecting the Loadability Limit of Distribution Equipment

The changes in the way how electricity distribution networks are operated have major consequences on the operation of physical equipment. There is a definite need to increase the intermittent current carrying capacity of assets, while at the same time the aging distribution network consists of high percentage of devices with increased level of degradation. The article describes a possible methodology to link known degradation models and thermal limits, giving operators the possibility to extend maximal load on transformers and cables, while observing physical limits of immediate damage. The article takes into consideration the changes of the limits with degradation. This viewpoint enables the intermittent uprating of the equipment, however, does not consider accelerated aging.