10.12
Logic
10.12.1
Tripping logic, common 3-phase output SMPPTRC
Prepare the IED for verification of settings outlined in section
This function is functionality tested together with other protection functions (line
differential protection,earth-fault overcurrent protection, and so on) within the IED. It
is recommended that the function is tested together with the autorecloser function,
when built into the IED or when a separate external unit is used for reclosing purposes.
The instances of SMPPTRC are identical except for the name of the function block
SMPPTRC. The testing is preferably done in conjunction with the protection system
and autoreclosing function.
10.12.1.1
Three-phase operating mode
1.
Check that
AutoLock
and
TripLockout
are both set to
Off
.
2.
Initiate a three-phase fault.
An adequate time interval between the faults should be considered, to overcome
a reclaim time caused by the possible activation of the Autorecloser function
SMBRREC. The function must issue a three-phase trip in all cases, when trip is
initiated by any protection or some other built-in or external function. The
following functional output signals must always appear simultaneously: TRIP,
TRL1, TRL2, TRL3 and TR3P.
10.12.1.2
1ph/3ph operating mode
In addition to various other tests, the following tests should be performed. They
depend on the complete configuration of an IED:
Procedure
1.
Make sure that
TripLockout
and
AutoLock
are both set to
Off
.
2.
Initiate different single-phase-to-earth faults one at a time.
Single-phase tripping will only be allowed when an autoreclose attempt will
follow. The autorecloser function SMBRREC has the functionality such as the
long trip time, CB ready and so on, which can prevent a proper single-phase
tripping and autoreclose. To by-pass this problem the fault initiation should be
with a test set and with the autoreclose in full service with a test set connected to
the distance protection function. Consider using an adequate time interval
between faults, to overcome a reclaim time of which is activated by SMBRREC.
Only a single-phase trip should occur for each separate fault and only one of the
Section 10
1MRK 506 355-UEN A
Testing functionality by secondary injection
230
Line distance protection REL670 2.1 IEC
Commissioning manual
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