Application

REF630 has been designed to be the main

protection for overhead lines and cable feeders,

in either isolated neutral, resistance-earthed,

compensated or effectively earthed distribution

networks. The comprehensive feeder

management relay offers four predefined

configurations, intended for open/closed ring

feeder applications, radial overhead/mixed line

feeder applications, ring/meshed feeder

applications and bus sectionalizers.

The earth-fault protection has been significantly

extended, now including not only directional

and non-directional, transient/intermittent,

wattmetric and admittance-based, but also both

harmonics and multifrequency admittance-based

earth-fault protection. The new additions take

the earth-fault protection to new heights,

creating an extensive earth-fault protection

portfolio. In addition, the sensitivity of the

intermittent earth-fault protection has been

significantly improved and reactive power

undervoltage protection added.