3
Directional Earth-fault Relay
Product Guide
SPAS 120 C
Features
• Two-stage directional earth-fault relay for
distribution networks
• Directional low-set earth-fault stage with
definite time characteristic
• Directional high-set earth-fault stage with
instantaneous operation or definite time
characteristic
• Operation direction of the high-set earth- fault stage either the same as that of the low-set stage, or the opposite
• Output relay functions to be freely config-
ured by the user
• Flexible adaptation of the relay to different
applications
• Manual selection or remote control of the
operation characteristic I0sinÕ or I0cosÕ
• Digital display of settings, measured quan-
tities, recorded fault values, etc.
• Extensive two-way data communication via
fibre-optic serial bus
• Continuous self-supervision of hardware
and software including auto-diagnosis
• Powerful software support for parameter-
ization and supervision of the relay
Application
The directional earth-fault relay SPAS 120 C
is designed to be used for selective feeder
earth-fault protection in isolated neutral and
impedance earthed networks. The relay is
especially useful in networks, where the oper-
ation characteristic of the earth-fault relay
must be remotely controllable.
The directional earth-fault relay can also be used for the earth-fault protection of power generators and large motors. |
Indotrade Priority 15th Year
