Alstom MiCOM P546 - 1.6 Optional distance protection; 1.7 Phase fault distance protection (Distance option only)

P54x/EN OP/La4 Operation
(OP) 5-30 MiCOM P543, P544, P545 & P546
OP
 If the ratio: I MUTUAL/IN is less than the ‘Mutual Cutoff’ setting, then full mutual
compensation is applied to all distance zones, and the fault locator.
 If the ratio: I MUTUAL/IN is greater than the ‘Mutual Cutoff’ setting, then no mutual
compensation is applied.
1.6 Optional distance protection
The MiCO
M P54x has, by ordering option, a comprehensive integrated distance protection
package. This comprises :-
 Phase fault distance protection
 Earth/ground fault distance protection
 Power sing detection, alarm, and blocking
 Out-of-step detection and tripping
 Switch on to fault (SOTF) and trip on reclose (TOR)
 Directional Schemes
 Aided schemes
These are described in the following sections and are marked as being applicable to the
distance option only. If the distance option is not specified, these will not be applicable, and
additional protection will be in the form of overcurrent etc., as described from section Error!
Reference source not found.
1.7 Phase fault distance protection (Distance option only)
The Mi
COM P54x has 5 zones of phase fault protection. It is possible to set all zones either
with quadrilateral (polygon) characteristics, or with mho circles. Each zone can be set
independently to be permanently disabled, permanently enabled or enabled in case of
protection communication channel fail. The impedance plot Figure 15 shows the
cha
racteristic when set for mho operation. The characteristic drawn for illustration is based
on the default distance settings without dynamic expansion.
P1134ENh
P1134ENa
Directional
(reverse)
Directional
(forward)
Z4
Z1
Z2
Z3
Zp
(forward)
Figure 15 Phase fault Mho characteristics (Distance option only)