Alternative methods for electric machine rated load temperature tests

The rated load temperature rise of an electric machine is an important performance metric that is typically determined by loading the machine at full load. However, it takes several hours to complete as the final temperature of the machine is only known after the machine is thermally stable. It would be desirable to complete such a test in 'minutes' instead of several hours. For large machines, it is practically impossible to load the machines at full load, due to lack of dynamometer capacity. It is therefore desirable if such a test could be performed without running the machine at full load. This paper proposes to determine the rated load temperature of a machine in a rapid manner. Two methods are considered: (i) short time overloading of the machine and (ii) a superposition equivalent loading approach that allows for determining the temperature rise of the machine without testing it at full load conditions. The obtained results indicate that these methods can be applied with suggested improvements to determine temperature for both small and large machines

Impacts of Earthquakes on Electrical Grid Resilience

One of the most complex and devastating disaster scenarios that the U.S.~Pacific Northwest region and the state of Oregon faces is a large magnitude Cascadia Subduction Zone earthquake event. The region's electrical grid lacks in resilience against the destruction of a megathrust earthquake, a powerful tsunami, hundreds of aftershocks and increased volcanic activity, all of which are highly probable components of this hazard. This research seeks to catalyze further understanding and improvement of resilience. By systematizing power system related experiences of historical earthquakes, and collecting practical and innovative ideas from other regions on how to enhance network design, construction, and operation, important steps are being taken toward a more resilient, earthquake-resistant grid. This paper presents relevant findings in an effort to be an overview and a useful guideline for those who are also working towards greater electrical grid resilience.Comment: Accepted by the "2021 57th IEEE Industrial and Commercial Power System Conference" for presentation and publicatio