Alstom MiCOM P54 Series, Technical Manual

Page: 125 / 1024

Settings P54x/EN ST/La4
MiCOM P543, P544, P545, P546
(ST) 4-47
ST
Setting range
Menu text Default setting
Min. Max.
Step size
Ext. Prot. Reset
Prot. Reset &

<

< Only, CB Open &

<, Prot. Reset &

<
Setting which determines the elements that will reset the circuit breaker fail time for
external protection function initiated circuit breaker fail conditions.
WI Prot. Reset Disabled Disabled or Enabled
When Enabled, CB Fail timers will be reset by drop off of a weak infeed trip condition,
p
g that WI trip logic i rovidin s activated.
UNDERCURRENT

< nt Set Curre
0.05 x In
0.02 x

n 3.2 x

n 0.01 x

n
Setting that determines the circuit breaker fail timer reset current for overcurrent based
rotectio le dead logic to
ead or live).
p n circuit breaker fail initiation. This setting is also used in the po
determine the status of the pole (d

SEF< Current 0.02x

n
SEF
0.001x

n
SEF
0.8x

n
SEF
0.00005 x

n
Setting that determin
(SEF) protection c es th reaker fail r reset current sitive earth fault
ircuit er fail initiation.
e circuit b
break
time for Sen
POLEDEAD VOLTAGE
V< 38.10 V 10 V 40 V 0.1 V
1.3.19 S
Th in operates on d phase s ce (nps)
voltage witho sen ative phase sequ
T
a
T
t
upervision (VTS, CTS, Inrush detection and special weak infeed blocking)
e VTS feature with
ut the pre
the relay
ce of neg
etection of negative
ence current.
equen
he CT supervision feature operates on detection of derived zero sequence current, in the
bsence of corresponding derived zero sequence voltage that would normally accompany it.
he Special Weak Infeed Blocking is not normally applied, and is described in detail later in
his service manual.
Setting range
Menu text Default setting
Min. Max.
Step size
VT SUPERVISION
VTS Mode Me MCB
Me MCB, Measured Only or MCB
Only
Setting that determines the method to be used to declare VT failure.
VTS Status Blocking Disabled, Blocking, Indication
This setting determines he following o will occur upon dete of VTS.
y.
g of voltage dependent protection elements.

Optional conversion rren irectional protection
set nly) re found in the function
rotection element
whether t perations ction

VTS set to provide alarm indication onl

Optional blockin
of directional overcu
to blocking mode o t elements to non-d
(available when
links cell of the relevant p . These settings a
columns in the menu.
VTS Reset Mode Manual Manual, Auto
The VTS block will be latched after a user settable time delay ‘VTS Time Delay’. Once the
a
e,
n
restored above the phase level detector settings for more than 240 ms.
signal has latched then two methods of resetting are available. The first is manually vi
the front panel interface (or remote communications) and secondly, when in ‘Auto’ mod
provided the VTS condition has been removed and the 3 phase voltages have bee