If a block/unblock command is sent from remote to function, while
the IED is shut down, this command will not be recognized after
the start up, thus the command that was sent prior to the shut down
is used. In such cases, where there is a mismatch, the user is
advised to make a complete cycle of block/unblock operations to
align the statuses.
6.8
Testing logic functions
6.8.1
Tripping logic SMPPTRC
Prepare the IED for verification of settings as outlined in
Values of the logical signals for SMPPTRC are available on the local HMI under
Main menu/Tests/Function status/Logic/SMPPTRC(94,1->0)/X:SMPPTRC
.
The Signal Monitoring in PCM600 shows the same signals that are available on the
local HMI.
This function is functionality tested together with other protection functions (earth-
fault overcurrent protection, and so on) within the IED. It is recommended that the
function is tested together with the autorecloser function, or when a separate
external unit is used for reclosing purposes. The testing is preferably done in
conjunction with the protection system and autorecloser function.
6.8.1.1
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 functional TRIP output signal must always appear.
6.8.1.2
Circuit breaker lockout
The following tests should be carried out when the built-in lockout function is used
in addition to possible other tests, which depends on the complete configuration of
an IED.
1.
Check that
AutoLock
and
TripLockout
are both set to
Off
.
2.
Initiate a three-phase fault.
Section 6
1MRK 511 248-UEN -
Testing functionality
84
Commissioning Manual
