Fanox has extended its Medium Voltage protection family with the Voltage and Frequency protection relay; SIL-V, among other applications, incorporates interconnections protection and protection against ‘loss of mains’ or islands in the distribution network.
Loss of Mains (Islanding) occurs when part of the public utility network loses connection with the rest of the systems. If this situation is not detected, then the generator could remain connected, causing a safety hazard within network.
Automatic reconnection of the generator to the network may occur causing damage to the generator and the network.
SIL V protection relay detects this situation thanks to its voltage and frecuency functions focused on the Rate of change of frequency (ROCOF) method.