Alstom MiCOM P546 - Page 114

P54x/EN ST/La4 Settings
(ST) 4-36 MiCOM P543, P544, P545, P546
ST
Setting range
Menu text Default setting
Min. Max.
Step size
N>3 Directional
Non-directional
Non-directional
Directional Fwd
Directional Rev
N/A
This setting determines the direction of measurement for the earth fault overcurrent
element.
N>3 Current Set 10 x n 0.08 x n 32 x n 0.01 x n
Pick-up setting for third overcustage earth fault rrent element.
N>3 Time Delay
0 s 0 s 100 s 0.01 s
Setting for the operating time-delay for third stage earth fault overcurrent element.
 N>4 Cells as for
N>3 Above
Settings the same as the third stage earth fault overcurrrent element.
N> Blocking
00001111
Bit 0 = VTS Blo , Bit 1 = locks cks >1 VTS B
>2, Bit 2 = VTS Blocks >3, Bit 3 = VTS
Blocks >4, Bits 5 & 6 are not used.
Logic Settings that dete ther blocking
earth fault overcurrent stages.
t
If IN> Status is set ‘Enabled VTS’, no blocking r to provide earth
y earth protec ition.
rmine whe signals from VT supervision affect certain
VTS Block - only affects directional earth fault overcurrent protection. With the relevant bi
set to 1, operation of the Voltage Transformer Supervision (VTS), will block the stage.
When set to 0, the stage will revert to Non-directional upon operation of the VTS.
should be selected in orde
tion during VTS condfault clearance b fault overcurrent
IN> DIRECTIONAL
N> Char. Angle
-60° –95° +95° 1°
Setting for the relay ch
visible only when
ara gle used fo ctional d
‘Direc d’ or ‘Direction et.
cteristic an
tional Fw
r the dire
al Rev’ is s
ecision. The setting is
N>Pol
Zero Sequence
Zero Sequence or
Neg. Sequence
N/A
Setting that determines whether the directional function uses zero sequen
sequence voltage polarizing.
ce or negative
N>VNpol Set
1 V 0.5 V 80 V 0.5 V
Setting for the minimum zero sequence voltage polarizing quantity for directional decision.
Setting is visible only when ‘Zero Sequence’ polarization is set.
N>V2pol Set
1 V 0.5 V 25 V 0.5 V
Setting for the minimum negative sequence vo ltage polarizing quantity for directional
decision. Setting is visible only when ‘Negative Sequence’ polarization is set.
N>I2pol Set
0.08 x In
0.08 x n 1 x n 0.01x n
Setting for the minimum negative sequence current polarizing quantity for directional
decision. Setting is visible only when ‘Negative Sequence’ polarization is set.