ZCVPSOF is activated either by the external input
BC
, or by the internal DLD. FUFSPVC is done
with a pre-fault condition where the phase voltages and currents are at zero. A reverse three-
phase fault with zero impedance and a three-phase fault with an impedance corresponding to
the whole line is applied. This fault shall cause an instantaneous trip and result in a
TRIP
indication.
12.4.12.1
Activating ZCVPSOF externally
M13850-14 v7
1.
Activate the switch onto fault
BC
input.
During normal operating conditions, the
BC
input is de-energized.
2.
Set
AutoInitMode to DLD disabled and Mode to Impedance.
3.
Apply a three-phase fault condition corresponding to a fault at approximately 45% of the
line or with impedance at 50% of the used zone setting and current greater than 30% of
IBase.
The
ZACC
input is activated.
4.
Check that the
TRIP
output, external signals and indication are obtained.
12.4.12.2
Initiating ZCVPSOF automatically and setting mode to impedance
M13850-27 v7
1.
Deactivate the switch onto fault
BC
input.
2.
Set the current and voltage inputs to lower than
IPh< and UPh< for at least one second.
3.
Set
AutoInitMode to Voltage and Mode to Impedance.
4.
Apply a three-phase fault condition corresponding to a fault at approximately 45% of the
line or with impedance at 50% of the used zone setting and current greater than 30% of
IBase.Apply a two-phase fault condition corresponding to a fault at approximately 45%
of the line or with impedance at 50% of the used zone setting and current greater than
30% of
IBase.
The
ZACC
input is activated.
5.
Check that the correct
TRIP
output, external signals and indication are obtained.
12.4.12.3
Initiating ZCVPSOF automatically and setting mode to UILevel
GUID-E83E1B3D-026C-48DB-BB9B-43C6597DE5DB v4
1.
Deactivate the switch onto fault
BC
input.
2.
Set the current and voltage inputs to lower than
IPh< and UPh< for at least one second.
3.
Set
AutoInitMode to Voltage and Mode to UILevel.
4.
Apply the three-phase currents in such a way that the magnitudes are greater than
IPh<
and the three-phase voltages in such a way that the magnitudes and lower than
UPh< at
least for the duration of the
tDuration setting.
5.
Check that the correct
TRIP
output, external signals and indication are obtained.
12.4.12.4
Completing the test
M13850-41 v5
Continue to test another function or end the test by changing the
TestMode setting to Off.
Restore connections and settings to their original values, if they were changed for testing
purposes.
12.4.13
SEMOD158873-3 v3
Loss of excitation LEXPDIS
Prepare the IED for verification of settings outlined in
section
"Requirements" and section "Preparing for test" in this chapter.
1MRK 502 067-UEN B
Section 12
Testing functionality by secondary injection
147
Commissioning manual
