Numerical phase comparison line protection
The REL 352 is a numerical phase comparison transmission line protection system, optimized for operating with power line carrier equipment. It provides high speed relaying and is suitable for application to any voltage level. Its principle of operation makes it ideal for short lines and tapped lines with a power transformer that pose difficulties for distance protections.
The REL352 can also be used for three terminal applications. The current-only measuring principle offers advantages such as insensitivity to power swings, mutuals and problems associated with ccvt’s. Either ON/OFF or FSK power line carrier equipment can be used. The REL 352 protection system also provides digital fault recording, fault locating and extensive target records. An optional distance protection can be included to provide backup for a loss of communication channel.