Relays are compact devices that are connected throughout the power system to detect intolerable or unwanted conditions within an assigned area. Presently there are options of more than one technology providing relays for the same application. Some of them are very relevant whereas few are not the right choice.
We are dealing with AREVA make relays both Numerical and electromechanical. We can also change existing electromechanical realys to Numerical relay with a minimum shut down period keeping the diamension of the panel same.
Technically, most relays are small systems within themselves.Protective relays or systems are not required to function during normal power system operation, but must be mediately available to handle intolerable system conditions and avoid serious outages and damage. Thus, the true operating life of these relays can be on the order of a few seconds, even though they are connected in a system for many years. In practice, the relays operate far more during testing and maintenance than in response to adverse service conditions.
Nonetheless, protective relaying is a highly specialized technology requiring an indepth understanding of the power system as a whole. Modern relaying systems are highly reliable and provide accurate protection .
The decision to select a right technology is becoming increasingly evident nowadays. Electromechanical relays are still a very popular choice when it comes to providing simple protection requirement and there is no plans of going in for communication systems.
Pl contact us before selecting any kind of relays of AREVA make
As explained above Numerical relays with communication facility is far superior to any other relay without communication facility. Relays without communication hence can not be claimed as numerical relay.
Numerical technology implies sampling of the relay inputs, then A→D conversion into number format. These numbers are then used by mathematical algorithms, which generate the relay operating characteristics. Numerical relays are strongly dependent on algorithm (software statements) for its operation and due to extremely powerful processor, relays can perform variety of complex protection function.