P54x/EN ST/La4 Settings
(ST) 4-48
MiCOM P543, P544, P545, P546
ST
Setting range
Menu text Default setting
Min. Max.
Step size
VTS Time Delay 5 s 1 s 10 s 0.1 s
Setting that determines ela detectio
voltage supervision condition.
the operating time-d y of the element upon n of a
VTS > Inhibit 10 x n 0.08 x n 32 x n 0.01 x n
The setting is used to override a voltage supervision block in the event of a phase fault
occurring on the system that could trigger the voltage supervision logic.
VTS 2> Inhibit 0.05 x n 0.05 x n 0.5 x n 0.01 x n
The setting is used to override a voltage supervision block in the event of a fault
on the system with negative sequence current above this setting which
occurring
could trigger the
voltage supervision logic.
IN D TECTION RUSH E
I> 2
nd
Harmonic 20% 10% 100% 5%
If the level of second harmonic in any phase current or neutral current exceeds the setting,
sh co ng the status of four DDB signals from low to
igh in th PSL). The user then has a choice to use them
inru nditions will be recognized by changi
h e Programmable Scheme Logic (
further in the PSL in accordance with the application.
WEAK INFEED BLK
WI Inhibit Disabled Disabled or Enabled
This setting enables (tu ) or disables (turns off) a special to cove rios
generation, but has solid earthing at a Yd transform
rns on feature r scena
when there is a very weak positive or negative sequence source behind the relay, but the
zero sequence infeed is large. Special to stub-end transformer feeding, where the stub
end has no er neutral.
I0/I2 Setting 3 2 3 0.1
If the ratio of zero sequence current to negative sequence current exceeds the setting, all
ements suc nce, DEF an ring
ed will be inhibite ble I
protection el
a genuine weak infe
h as Dista
condition
d Delta that could potentially operate du
d. This setting will be visi only if ‘W
Inhibit’ is enabled.
CT SUPERVISION ( CTS)
CTS Mode Disabled
Disabled, Standard, I Diff,
Idiff + Standard
N/A
Setting to disable, enable the standard (voltage dependant) CTS or enable the Differential
(current based, communication dependant) CTS or allow both CTS algorithms to work
simultaneously
CTS Status Restrain Restrain, Indication
This setting determines ther the following o n dete of CTS.
e: T s to both CTS algorithms. The settings are visible if CTS Mode is
bled.
whe perations will occur upo ction
CTS set to provide alarm indication only.
CTS set to restrain local protection
Not he setting applie
not disa
C et Mode TS Res Manual Manual or Auto
The CTS block will be latched after a user settable time delay ‘CTS Time Delay’. Once the
ignal ha ly via
ondi s been removed. The setting is n for bo S
s s latched then two methods of resetting are available. The first is manual
the front panel interface (or remote communications) and secondly, when in ‘Auto’ mode,
provided the CTS c tion ha commo th CT
algorithms. The setting is visible if CTS Mode is not disabled.
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