P54x/EN ST/La4 Settings
(ST) 4-30
MiCOM P543, P544, P545, P546
ST
Setting range
Menu text Default setting
Min. Max.
Step size
PSB Reset Delay 0.2 s 0.05 s 2 s 0.05 s
Setting to maintain the power swing detection for a period after the delta current detection
has reset. I will naturally reset momentarily twice in each swing cycle, and a short setting
ensures continued PSB pick-up, to ride through the gaps.
OST Mode Disabled
Disabled, Pred OST Trictive & ip, OST
Trip, Predictive OST Trip
To enable (activate) or disable (turn off) Out of Step protection. This setting (and all
related settings below) is invisible if PowerSwing Block is disabled in ‘CONFIGURATION’
selected operate afte sured positive
s (@ 50 or 60 Hz)
ntering and exiting
f ‘Predictive O s
uence impedance has an 25ms but slower than
et tim
will operate
column.
If ‘OST Trip’ is , relay will r Tost time delay if the mea
sequence impedance has passed the Z6-Z5 region slower than 25 m
and if the polarity of the resistive component has changed between e
zone 5.
I ST Trip’ is elected, relay will operate after Tost time delay if the positive
seq passed the Z6-Z5 region faster th
‘Delta t’ s e.
If ‘Predictive & OST Trip’ is selected, it if any of two above criteria is satisfied.
Z5 30/In Ω 0.1/In Ω 500/In Ω 0.01/In Ω
Setting for Z5 forward reactance reach.
Z6 32/In Ω 0.1/In Ω 500/In Ω 0.01/In Ω
Setting for Z6 forward re ach. actance re
Z5’ -30/In Ω -0.1/In Ω -500/In Ω 0.01/In Ω
Setting for Z5 reverse reactance reach.
Z6’ -32/In Ω -0.1/In Ω -500/In Ω 0.01/In Ω
Setting for Z6 reverse reactance reach.
R5 20/In Ω 0.1/In Ω 200/In Ω 0.01/In Ω
Setting for Z5 positive re each. sistive r
R6 22/In Ω 0.1/In Ω 200/In Ω 0.01/In Ω
Setting for Z6 positive resistive reach.
R5’ -20/In Ω -0.1/In Ω -200/In Ω 0.01/In Ω
Setting for Z5 negative resistive reach.
R6’ -22/In Ω -0.1/In Ω -200/In Ω 0.01/In Ω
Setting for Z6 negative resistive reach.
Blinder Angle 80° 20° 90° 1°
Setting of blinder angle, common for both Z5 and Z6.
Delta t 0.03 s 0.03 s 1 s 0.001 s
Time setting that
impedance enterin
is c red with the me ed time b en positiv nce
g Z6 a ntering Z5.
ompa
nd e
asur etwe e seque
Tost 0 s 0 s 1 s 0.01 s
Tripping time delay com on. mon for any OST setting opti
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