Fig. 1 Protection function overview of standard configuration A and B
3. Protection functions
The IED offers directional and non-direc-
tional overcurrent and thermal overload
protection, directional and non-directional
earth-fault protection, sensitive earth-fault
protection, phase discontinuity protection,
transient/intermittent earth-fault protection,
overvoltage and undervoltage protection,
residual overvoltage protection, positive-se-
quence undervoltage and negative-sequence
overvoltage protection. In addition the IED
offers three-pole multi-shot auto-reclose func-
tions for overhead line feeders.
Enhanced with optional hardware and soft-
ware, the IED also features three light detec-
tion channels for arc fault protection of the
circuit breaker, busbar and cable compart-
ment of metal-enclosed indoor switchgear.
The arc-fault protection sensor interface is
available on the optional communication
module. Fast tripping increases personal
safety and limits material damage within the
switchgear in an arc fault situation.
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