Protection functions
The IED offers directional and non-directional overcurrent and thermal overload protection as
well as directional and non-directional earth-fault protection.
Some standard configurations allow as an option admittance-based, harmonics-based or wattmetric-based earth-fault protection to be
used in addition to directional earth-fault protection.
Further, the IED features sensitive earth-fault protection, phase discontinuity protection, transient/intermittent earth-fault protection,
overvoltage and undervoltage protection, residual overvoltage protection, positive-sequence undervoltage
and negativesequence overvoltage protection.

In addition to protection, measurement, control, condition monitoring and general functions,
the REF 543 feeder terminals are provided with a large amount of PLC functions,
which allow for several automation and sequence logic functions, needed for substation automation, to be integrated into one unit.
The data communication properties include the following communication standards:
SPA bus, LON bus, IEC 60870-5-103. IEC 61850 via SPA-ZC 400.
Profibus DPV1 via SPA-ZC 302. DNP 3.0 and Modbus communication with higher level equipment.
Further, the LON communication together with the PLC functions minimizes the need for hardwiring between the feeder terminals.
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