P54x/EN ST/La4 Settings
(ST) 4-28
MiCOM P543, P544, P545, P546
ST
Setting range
Menu text
Min. Max.
Default setting Step size
TOC Delay 0.2 s 0.05 s 0.2 s 0.01 s
The TOC Delay is a user le time delay foll g the CB o after wh TOR
must be set in conjunction with the Dead Time setting
g must not exceed the minimum Dead Time setting
start instantaneously.
settab owin pening ich the
becomes active (enabled). The time
of the Auto-reclose so that the settin
since both timers
SOTF Pulse 0.5 s 0.1 s 10 s 0.01 s
The SOTF Pulse
available. This se
is a u ind is
tting is ls are selected to enable
ser settable time w
visible only if ExtPu
ow during which the SOTF protection
e or Pdead + Pulse
SOTF
Z1 Extension
Z1 Ext Scheme Disabled
Disabled, Enabled, En. on Ch1 Fail,
En. On Ch2 Fail, En All Ch Fail, or
En. Any Ch Fail
Setting that enables (turns on) or dis
Enabled, extended Zone 1 will apply unl
ables (turns off) the Zone 1 Extension scheme. When
ess the Reset Zone 1 Extension DDB signal is
possible to enable Z1X when aided scheme channel(s) fail. energized. Otherwise, it is
Z1 Ext Ph 150% 100% 200% 1%
Extended Z1 rea rcentage of t
for Z1X is the same as for Zone 1.)
X phase ch as a pe he Z1 phase reach. (Phase resistive reach
Z1 Ext Gnd 150% 100% 200% 1%
Extended Z1X ground reach as a percentage of Z1 ground reach. (Ground resistive reach
and residual compensation for Z1X is the same as for Zone 1.)
Loss of Load
LOL Scheme Disabled
Disabled, Enabled, En. on Ch1 Fail, En.
On Ch2 Fail, En All Ch Fail, or En. Any Ch
Fail
Setting that enables (tu n) or disables (tu ff) the Los Load sch hen
e end open (3-pole trip a s
hen aided scheme channel(s) fail.
rns o rns o
remot
s of
s
eme. W
pplicationEnabled, accelerated tripping can apply as the
only). Otherwise, it is possible to enable Z1X w
LOL <I 0.5 x In 0.05 x In 1 x In 0.05 x In
LOL undercurrent detector that indicates a loss of load condition on the unfaulted phases,
indicating that the remote end has just opened.
LOL Window 0.04 s 0.01 s 0.1 s 0.01 s
Length L window - t window in whi tripping can occur
undercurre r operation.
of LO
following LOL
he time
nt detecto
ch Zone 2 accelerated
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