Numerical segregated phase comparison line protection
The REL 350 is a numerical segregated phase comparison transmission line protection system with optional distance backup protection. Although particularly suitable for series compensated lines and single pole tripping, REL350 provides high speed tripping for any transmission line application.
The current-only measuring principle offers advantages such as insensitivity to power swings, mutuals and problems associated with ccvt’s. Communication interfaces for 9600 bps audiotone or 64 kbps direct digital or fiber optic are available. The REL 350 protection system also provides digital fault recording, fault locating and extensive target records.