Alstom MiCOM P54 Series - 1.12.2 Offset quadrilateral (Distance option only); 1.12.3 Reactance line - top line of quadrilateral (Distance option only)

Operation P54x/EN OP/La4
MiCOM P543, P544, P545 & P546 (OP) 5-37
OP
1.12.2 Offset quadrilateral (Distance option only)
This characteristic is used for Zone 3 when the offset is enabled.
Reactance
Blinder
Blinder
Reactance
P1173ENa
P1134ENa
Figure 20 Offset quadrilateral for zone 3 (Distance option only)
It is formed from two reactance lines and two resistive reach blinders. The upper reactance
line is arranged to operate for faults below it and the lower for fault above it. The right hand
blinder is arranged to operate for faults to its left and the left hand blinder for faults to its
right. The counter increments when all these conditions are satisfied.
Note: When Zone 3 is set offset in simple setting mode, the left hand blinder
and lower reactance line equal the offset percentage setting of the line
impedance and fault resistance respectively. In the advanced setting
mode, both lines can be set independently.
1.12.3 Reactance line - top line of quadrilateral (Distance option only)
The MiCOM
P54x provides a flexible user settable top reactance line tilting mode:
1. Dynamic (self adaptive) tilt angle - applicable to ground distance only
2. Fixed tilt angle - applicable to phase distance and ground distance if Dynamic tilting is
disabled
Z
Iref
V
I
I
V
I
- Z
P1174ENa
P1134ENa
Figure 21 Reactance line - top line of quadrilateral (Distance option only)