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MiCOM Alstom P841 - Multifunction line terminal IED Brochure0 pages
I PROTECTION
MiCOM Alstom P841
Multifunction line terminal I ED
The MiCOM Alstom P841 provides control and backup protection in transmission feeder
bays. Models exist for single breaker applications and where two circuit breakers feed each
line - such as in breaker and a half or ring bus topologies.
Figure l. Front view of P841-B
In all applications, supervision of correct
breaker functioning and management of
autoreclose cycles for power restoration after
a fault are critical. Internal circuit breaker fail
elements, autoreclose control and check
synchronism ensure that these primary goals
are achieved.
The logic capabilities of the devices are
extremely versatile, for instance managing
leader-follower reclosing schemes in case
of dual breaker applications. Single-pole
and 3-pole breaker operation is
Key features
Circuit Breaker control
Adapted to suit different substation
and circuit topologies:
• Single circuit breaker applications
(P841 model A)
• Breaker and a half, double bus or ring bus
• with dual breaker control (P841 model B)
Integrated directionalised protection for the
circuit
Multi-shot autoreclosure with check
synchronism:
• Single circuit breaker applications (P841-A
model)
• Breaker and a half, or mesh feeding with
two sets of CT inputs per end with settable
independent CT ratios (P841-B model)
Improved system stability by CB failure fast
reset element (< 0.75 cycle)
Readily interfaces with multiple
automation protocols, including I EC 61850
• MiCOM Alstom P40 series extends I EC
61850-8-1 station bus to include Parallel
Redundancy Protocol (PRP), which offers a
vendor-interoperable solution to implement
redundant communications. It has the
advantage of taking zero time to recover
from a failure, as parallel alternative paths
are continually operative. This compares to
25 ms or more healing time for legacy
techniques such as RSTP
I EC 61850-9-2 process bus interface
supported, with independent supervision and
condition monitoring statistics per pole
possible. Trip circuit supervision, control and
interlocking schemes can be designed
in graphical support software.
Ancillary applications include use of the P841
for binary I/O concentration, disturbance
recording, or as a gateway to SCADA.
Multiple protection elements are provided,
such as directional overcurrent, earth fault,
voltage and frequency. This allows
deployment as a back-up I ED in transmission
applications, or as the main 2 protection
solution for subtransmission.
■ Single box solution
■ Readily interfaces to SCADA protocols and
I EC 61850
■ Clear annunciation on tricolor LEDs
• Programmable function keys
• Application flexibility
■ ICE 61850-9-2 process bus ready
■ Redundant communications with zero
downtime using optional PRP technology
GRID
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