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Introductio
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MiCOM P40 Agile P442, P444
3 PRODUCT SCOPE
The MiCOM P442 and P444 Numerical Full Scheme Distance Relays provide
comprehensive distance protection for different applications like: lines, cables, tapped lines,
lines with multiple zero sequence sources, non-homogeneous lines, series compensated
lines and parallel lines.
The independently settable resistive reach for each zone allows easy application to short
lines and cable protection. Using well-proven, patented techniques to directionalise, and
making full use of digital memory, the relays can be applied in situations that can cause
classic distance implementations to maloperate (crosscountry faults and close-up faults).
The MiCOM P442 and P444 are in-built with a library of channel aided scheme logic,
supplementary and back-up protection. It provides complete protection (4 alternative setting
groups) to solidly earthed systems from distribution to transmission voltage levels.
Three phase tripping with faulted phase indication is provided for all protection functions. In
addition models P442 and P444 allow single-phase tripping for the distance protection and
the channel aided DEF protection (67N).
The P442 and P444 distance relays equipped with 150 MHz CPU and coprocessor board
have been enhanced as described in the following table:
Protection Functions Overview
ANSI IEC 61850
Features P442 P444
21P PDIS
Quadrilateral full scheme phase distance (6
zones)
• •
21G PDIS
Quadrilateral full scheme ground distance (6
zones)
• •
Load Blinder
• •
50/51/67
OcpPTOC
/ RDIR
Directional / non-directional phase overcurrent (2
stages)
• •
50N / 51N
/ 67N
EfdPTOC /
RDIR
Directional / non-directional stand by earth fault (2
stages)
• •
67N EfaPSCH
Channel aided directional earth fault protection
(DEF)
• •
32N Directional zero sequence power protection
• •
67/46
NgcPTOC
/ RDIR
Directional / non-directional negative sequence
overcurrent
• •
27 PTUV Undervoltage (4 stages, 1
st
stage DT and IDMT)
• •
59 PTOV Overvoltage (4 stages, 1
st
stage DT and IDMT)
• •
37 3-phase undercurrent (2 stages)
• •
81U Underfrequency (4 stages)
• •
81O Overfrequency (2 stages)
• •
49 PTTR Thermal overload protection
• •
50 / 27 PSOF Switch on to fault / trip on reclose (SOTF/TOR)
• •
78 / 68 RPSB
Power swing blocking & Out of step tripping
(using PSL)
• •
85 PSCH Channel aided schemes (PUP, POP, Blocking)
• •
Weak Infeed (WI) Echo logic
• •
Accelerated trip feature: Loss of Load - Zx
extension
• •
46BC Broken conductor (open jumper)
• •
50ST OcpPTOC Stub bus protection
• •
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