Islanding tests near a mini hydro generating plant

In this paper, the authors present the measurements taken while a mini-hydroelectric power plant and the adjoining load were islanded on a 25 kV distribution feeder. This was as a part of the plant's acceptance tests before commissioning. The frequency was allowed to vary from 56.3 to 64.5 Hz before the generation was tripped off. The authors also present the estimation of the moment of inertia of the generating system from these measurements.