Alstom MiCOM P54 Series, Technical Manual

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P54x/EN ST/La4 Settings
(ST) 4-34
MiCOM P543, P544, P545, P546
ST
Setting range
Menu text Default setting
Min. Max.
Step size

2>3 Current Set 0.2 x

n 0.08

n 32

n 0.01

n
Pick-up setting for the third stage negative sequence overcurrent element.

2>3 Time Delay 10 s 0 s 100 s 0.01 s
Setting for the operating time-delay for the th nt
e
ird stage negative sequence overcurre
lement.

2>4 Cells as for

2>3
Above

2> VTS Blocking 1111
Bit 00 = VTS blocks I2>1
Bit 01 = VTS blocks I2>2
Bit 02 = VTS blocks I2>3
Bit 03 = VTS blocks I2>4
Logic settings that determine whether VT supervision blocks selected negative sequence
overcurrent stages. Setting ‘0’ will permit continued non-directional operation.

2> Char. Angle
–60° –95° +95° 1°
Setting for the relay characteristic angle used for the directional decision.

2pol Set 2> V
5 0.5
25
0.5
Setting determines the minimum nega
present to determine directionality. tive sequence voltage threshold that must be
1.3.9 Broken conductor
ing Sett range
Menu text setting
Min. Max.
Default Step size
Broken Conductor Disabled Enabled/Disabled N/A
Enables or disables the broken conductor function.

2/

1 0.2 0.2 1 0.01
Setting to determine the pick- up level of the negative to positive sequence current ratio.

2/

1 Time Delay
60 s 0 s 100 s 1 s
Setting for the function operating time delay.
1.3.10 Earth fault
T ection included in the MiCOM P54x provides four
non-directional/dire ree-phase ov prote e me
racteristics. All lt overcurren a app ee
p e four stages.
T ges of e fault overcurrent p tion have -delayed c acteristics
w time (IDMT), or definite time (DT).
T stics only.
he back-up earth fault overcurrent prot
stage
delay cha ctional th
earth fau
ercurrent
t and direction
ction with ind
l settings
pendent ti
ly to all thr
hases but are independent for each of th
he first two sta arth rotec time har
hich are selectable between inverse definite minimum
he third and fourth stages have definite time characteri
Setting range
Menu text Default setting Step size
Min. Max.

N>1 Status
Enabled
Disabled, Enabled, Enabled VTS, Enabled
Ch Fail, En VTSorCh Fail, En VTSandCh
Fail
Setting that defines first stage overcurrent operating status. Depending of this setting,
IN>1 will be enabled permanently or in case of Voltage Transformer Supervision (fuse fail)
operation, or in case of communication channel fail, or a combination (and /or) of both.