Alstom MiCOM P545 - Page 23

Introduction P54x/EN IT/La4
MiCOM P543, P544, P545 & P546 (IT) 1-7
IT
Models
ANSI FEATURE P543 P544 P545 P546
Phase elements
Characteristic
Ground elements
Mho and quadrilateral
CVT transient overreach elimination
   
Load blinder
   
Easy setting mode
   
Mutual compensation (for fault locator
and distance zones)
   
85
Communication-aided schemes, PUTT,
POTT, Blocking, Weak Infeed
   
Accelerated tripping - loss of load and Z1
extension
   
50/27
Switch on to fault and trip on recluse -
elements for fast fault clearance upon
breaker closure
   
68 Power swing blocking
   
78 Out of step
   
67N
Directional earth fault (DEF) unit
protection
   
50/51/67
Phase overcurrent stages, with optional
directionality
4 4 4 4
50N/51N/ 67N
Earth/ground overcurrent stages, with
optional directionality
4 4 4 4
51N/67N/SEF Sensitive earth fault (SEF 4 4 4 4
67/46
Negative sequence overcurrent stages,
with optional directionality
   
46BC
Broken conductor (open jumper), used to
detect open circuit faults
   
49 Thermal overload protection
   
27 Undervoltage protection stages 2 2 2 2
59 Overvoltage protection stages 2 2 2 2
59 Remote Remote overvoltage protection stages 2 2 2 2
59N
Residual voltage stages (neutral
displacement)
2 2 2 2
81U/O/R
A 4-stage underfrequency, 2-stage
overfrequency and an advanced 4-stage
rate of change of frequency element as
well.
   
50BF
High speed breaker fail. Two-stage,
suitable for re-tripping and backtripping
   
CTS
CT supervision (including differential
CTS, patent pending)
   
VTS
Current and voltage transformer
supervision
   
79 Auto-reclose - shots supported 4 4 4 4