Relay hardware - Arc protection - Auto synchronization - Bay control and measurement - Merging unit - Transformer protection - 2 winding - Feeder protection - Voltage regulation - Capacitor bank protection - Petersen Coil control - Grid automation - Busbar differential protection (high impedance) - Back-up protection - Motor protection - Busbar protection (voltage and frequency) - Transformer protection - 3 winding - Interconnection protection - Generator protection - Power management/Load shedding - Modification Sales Guideline - REX640 Protection and control - Relion Protection and Control - PCL4 - IEC - ANSI - 16.02.2023

REX640 Modification Sales Guideline

It is possible to add new hardware modules into empty module slots in the relay. It is also possible to change an existing hardware module type to a different one. The rules for module slot allocation are the same as when configuring a new relay. Relays-Online can be used to determine the feasibility of the planned change.

A spare hardware module alone cannot be used to modify a relay. The relay always requires a new license when its hardware or software is modified. The new license is a part of the Modification Sales delivery. Inserting an additional module into a relay or replacing a module type with another one without a proper license causes an internal fault in the relay.