Distributed bus differential relay becomes the complete integrated protection system for the substation

Integrated protection and control bay IEDs can become bus differential bay IEDs, that includes a breaker failure protection also, with a moderate increase in cost. So, it is possible to think in applying these functions down to 30 kV; where, traditionally, they are not been applied. The consequence is to improve quality and to increase safety for people and to minimize damages to high voltage equipment. On the other hand, distributed bus differential architecture offers the base to merge every protection and control functions needed in a substation, including communications. The convergence of both facts, enable the creation of a complete protection and control system. A system offering flexibility to the user and the application to determine the level of integration depending to the reliability, safety, and physical redundancy requirements.