This flexibility and added functionality has increased complexity, resulting in the emergence of more complicated relays to set and commission.
Also, the failure of the hardware platform can result in a loss of all protective functions within the relay package and must be considered in the system design to maintain the concept of primary and backup protection.
This article addresses these issues and provides practical solutions.
These shortcomings, however, are far outweighed by the many advantages of
digital relays.
Users have seen the many benefits of digital relays with most new installations using this technology.