Abstract: Many of the power utilities around the world have experienced spurious tripping of directional earth fault relays in their mesh distribution networks due to induced circulating currents.

ABB has released its Relion REF615R feeder IED. The REF615R was designed to offer an easy, quick and affordable way to upgrade ABB’s DPU2000R relay along with providing a 19-inch rack mount version of ...

The following ABB PDF document describes the sense, the potentials and the use of directional protection and directional zone selectivity functions, 'D' and 'SdZ D' respectively: Selection of the ...

ABB has launched a new approach to replacing time-served relays in power distribution networks that reduces the time required from around a month to only one hour ...