Alstom MiCOM P846, Technical Manual

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P846/EN CM/D Commissioning
(CM) 10-20
MiCOM P846
6. SETTING CHECKS
The setting checks ensure that all of the application-specific relay settings (i.e. both the
relay’s function and programmable scheme logic settings), for the particular installation, have
been correctly applied to the relay.
If the application-specific settings are not available, ignore sections 6.1 and 6.2.
Note: The trip circuit should remain isolated during these checks to prevent
accidental operation of the associated circuit breaker.
6.1 Apply application-specific settings
There are two methods of applying the settings to the relay:
Transferring them from a pre-prepared setting file to the relay using a portable PC running
the appropriate software via the relay’s front EIA(RS)232 port, located under the bottom
access cover, or rear communications port (with a KITZ protocol converter connected). This
method is preferred for transferring function settings as it is much faster and there is less
margin for error. If programmable scheme logic other than the default settings with which
the relay is supplied are to be used then this is the only way of changing the settings.
If a setting file has been created for the particular application and provided on a diskette, this
will further reduce the commissioning time and should always be the case where
application-specific programmable scheme logic is to be applied to the relay.
Enter them manually via the relay’s operator interface. This method is not suitable for
changing the programmable scheme logic.
Note: It is essential that where the installation needs application-specific
Programmable Scheme Logic, that the appropriate .psl file is
downloaded (sent) to the relay, for each and every setting group that
will be used. If the user fails to download the required .psl file to any
setting group that may be brought into service, then factory default
PSL will still be resident. This may have severe operational and
safety consequences.
6.2 Demonstrate correct relay operation
Tests 5.2.9 and 5.2.10 have already demonstrated that the relay is within calibration, thus
the purpose of these tests is as follows:
CM
−
To determine that the primary protection functions of the relay can trip according to the
correct application settings.
−
To verify correct assignment of the trip contacts, by monitoring the response to a
selection of fault injections.
6.2.1 Open line detector protection testing
This test, performed on the DLO protection function in setting group 1, demonstrates that the
relay is operating correctly at the application-specific settings.
6.2.1.1 Connection and preliminaries
Determine which output relay has been selected to operate when an ‘Open Line Detect’ trip
occurs by viewing the relay’s programmable scheme logic.
The programmable scheme logic can only be changed using the appropriate software. If this
software has not been available then the default output relay allocations will still be
applicable.
The associated terminal numbers can be found from the external connection diagram
(P846/EN IN).