Protection Functions - ABB RED615 Product Manual

ABB
Line Differential Protection and Control
RED615
Product version: 2.0
Table 2. Supported functions, continued
Functionality
Disconnector position indication, instance 1
Disconnector position indication, instance 2
Disconnector position indication, instance 3
Earthing switch indication
Auto-reclosing
Condition monitoring
Circuit-breaker condition monitoring
Trip circuit supervision, instance 1
Trip circuit supervision, instance 2
Current circuit supervision
Protection communication supervision
Measurement
Disturbance recorder
Three-phase current measurement
Sequence current measurement
Residual current measurement
Residual voltage measurement
● = included, o = optional at the time of order
1) Note that all directional protection functions can also be used in non-directional mode.

3. Protection functions

The IED offers two-stage phase-segregated
line differential protection, phase overcurrent
protection, negative phase-sequence
overcurrent protection and circuit-breaker
failure protection. Depending on the standard
configuration chosen, the basic functionality
can be extended by thermal overload
protection, directional or non-directional
earth-fault protection, sensitive earth-fault
protection, phase discontinuity protection,
transient/intermittent earth-fault protection
and three-pole multi-shot auto-reclose
functions for overhead line feeders.
The line differential protection function
includes a stabilized low stage and an
instantaneous high stage. The stabilized low
stage provides sensitive differential
protection and remains stable during, for
example, current transformer saturation
conditions. The low-stage operation can be
restrained using second harmonic detection if
an out-of-zone power transformer is to be
energized. The instantaneous high stage
offers less sensitive differential protection but
enables fast operation during high fault
currents.
1MRS756500 B
Issued: 03.07.2009
A B C
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