Name
Type
Values (Range)
Unit
Description
UL1
REAL
-
kV
Voltage in phase L1
UL2
REAL
-
kV
Voltage in phase L2
UL3
REAL
-
kV
Voltage in phase L3
6.3.7
Operation principle
SEMOD153665-4 v8
The automatic switch onto fault logic ZCVPSOF can be activated externally (by
the breaker-closed input) or internally (automatically) with the dead-line detection
using the UI level-based logic. When the setting
AutoInitMode
is
DLD disabled
,
ZCVPSOF is activated by an external binary input
BC
. When the setting
AutoInitMode
is set to
Voltage
,
Current
or
Current & Voltage
modes, ZCVPSOF is
activated by the dead-line detection.
The activation from the dead-line detection function is released if the internal
signal
DeadLine
from the UILevel Detector function is activated at the same
time as the inputs
ZACC
and
START_DLYD
are not activated at least for the
duration of
tDLD
. The internal signal
DeadLine
from the UILevel Detector
function is activated under any of the following conditions:
•
If all three-phase currents are below the setting
IPh<
and the
AutoInitMode
setting is set to
Current
•
If all three-phase voltages are below the setting
UPh<
and the
AutoInitMode
setting is set to
Voltage
•
If all three-phase currents and voltages are below the settings
IPh<
and
UPh<
and the
AutoInitMode
setting is set to
Current & Voltage
Once the dead line drops off after energization or once
BC
drops off, the activated
signal is extended for the duration of
tSOTF
.
The internal signal
SOTFUILevel
is activated if the phase voltage is below the
set
UPh<
and the corresponding phase current is above the set
IPh<
for a time
longer than the duration set by
tDuration
.
To get the
TRIP
signal, one of the different operate modes must also be selected
with the
Mode
parameter:
•
Mode
=
Impedance
;
TRIP
is released if either the
ZACC
input (connected
normally to a nondirectional distance protection start zone) or the
START_DLYD
input is activated. If
START_DLD
is activated,
TRIP
is
released after a delay of
tOperate
.
•
Mode
=
UILevel
;
TRIP
is released if UILevel detector is activated
•
Mode
=
UILvl&Imp
;
TRIP
is released based either on the impedance-
measured criteria or UILevel detection
The ZCVPSOF function can be blocked by activating the input
BLOCK
.
1MRK 506 382-UEN A
Section 6
Impedance protection
Line distance protection REL650 2.2 IEC
133
Technical manual
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