Month: January 2012

Directional Comparison Unblocking (DCUB) Scheme

Directional Comparison UnBlocking Scheme

The DCUB Scheme, like POTT Scheme, uses two frequencies to maintain system protection. When the system is operating under normal condition, the transceiver emits the “Guard” frequency. When a fault appears in the system, the distance relays shift the carrier to “Trip” frequency. This is where the similarities between POTT and DCUB schemes end.