CM
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.
Note 1: The trip circuits should remain isolated during these checks to prevent
accidental operation of the associated circuit breaker.
Note 2: For busbar protection stability reasons, whatever is the maintenance
mode selected, the Check Zone will never be disabled, thus, the time
to inject current shall be shorter than the ID>1 set timer to avoid
Circuitry Fault alarms.
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. This method is preferred for transferring function settings as
it is much faster and there is less margin for error. If the programmable scheme logic
other than the default settings with which the relay is supplied is 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 digital
medium, 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.
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