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The Under/Over Voltage room is specifically designed for testing and evaluating the performance of voltage protection relays. It enables precise simulation of voltage sag and swell conditions across various ranges and examines the relay’s response to these conditions.

Using this module, you can graphically define a trajectory for the impedance or the differential–bias current seen by the relay, thereby making it straightforward to conduct key dynamic tests such as power swing or saturation detection.

This room supports defining directional sectors and any number of elements, including line-to-line, phase-to-ground, positive-sequence, negative-sequence, and zero-sequence.