1.
Check the blocking of the echo with the injection of a CRL signal >40ms after a
reverse fault is applied.
2.
Measure the duration of the echoed CS signal by applying a CRL receive signal.
3.
Check the trip functions and the voltage level for trip by reducing a phase voltage
and applying a CRL receive signal.
6.9.2.3
Testing conditions
Only one type of fault is sufficient, with the current reversal and weak-end infeed logic
for distance protection function ZCRWPSCH (85). .. For phase A-G fault, set these
parameters:
Table 11:
Phase A-G parameter values
Phase
I (Amps)
Phase-angle (Deg) V (Volts)
Phase-angle (Deg)
A
0
0
Set less than
UPN<PU27PN
0
B
0
240
69.3
240
C
0
120
69.3
120
If wanted, change all settings cyclically for other faults (BG andCG).
Weak-end infeed set for echo and trip
1.
Apply input signals according table
.
2.
Activate the receive (CR) signal.
3.
After the IED has operated, turn off the input signals.
4.
Check that trip, send signal, and indication are obtained.
(note: a 200mS pulse)
6.9.2.4
Completing the test
Continue to test another function or end the testing by setting the parameter
TestMode
to
Disabled
under
Main menu/Tests/IED test mode/1:TESTMODE
. If another
function is tested, then set the parameter
Blocked
to
No
under
Main menu/Tests/
Function test modes/Scheme communication/ZCRWPSCH(85)/1:ZCRWPSCH
for
the function, or for each individual function in a chain, to be tested next. Remember to
set the parameter
Blocked
to
Yes
, for each individual function that has been tested.
Section 6
1MRK 506 331-UUS A
Testing functionality
128
Commissioning Manual
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