Getting Started P54x/EN GS/La4
MiCOM P543, P544, P545 & P546
(GS) 3-9
GS
Communications settings
Measurement settings
Event & fault record settings
User interface settings
Commissioning settings
1.6 Password protection
The m
enu structure contains three levels of access. The level of access that is enabled
determines which of the relay’s settings can be changed and is controlled by entry of two
different passwords. The levels of access are summarized in Table 2.
Access level Operations enabled
Level 0
No password required
Read access to all settings, alarms, event
records and fault records
Level 1
Password 1 or 2 required
As level 0 plus:
Control commands, e.g.
Circuit breaker open/close.
Reset of fault and alarm conditions.
Reset LEDs.
Clearing of event and fault records.
Level 2
Password 2 required
As level 1 plus:
All other settings
Table 2
Each of the two passwords are 4 characters of upper case text. The factory default for both
passwords is AAAA. Each password is user-changeable once it has been correctly entered.
To enter a password, either use the prompt when a setting change is attempted, or from the
menu select System data > Password. The access level is independently enabled for each
interface, therefore if level 2 access is enabled for the rear communication port, the front
panel access remains at level 0 unless the relevant password is entered at the front panel.
The access level, enabled by the password, times out independently for each interface after
a period of inactivity and reverts to the default level. If the passwords are lost, contact
ALSTOM Grid with the relay’s serial number and an emergency password can be supplied.
To find the current level of access enabled for an interface, select System data > Access
level. The access level for the front panel User Interface (UI) is one of the default display
options.
The relay is supplied with a default access level of 2, such that no password is required to
change any of the relay settings. It is also possible to set the default menu access level to
either level 0 or level 1, preventing write access to the relay settings without the correct
password. The default menu access level is set in System data > Password control.
Note: That this setting can only be changed when level 2 access is enabled.
1.7 Relay configuration
The rel
ay is a multi-function device that supports numerous different protection, control and
communication features. In order to simplify the setting of the relay, there is a configuration
settings column which can be used to enable or disable many of the functions of the relay.
The settings associated with any function that is disabled are made invisible, i.e. they are not
shown in the menu. To disable a function change the relevant cell in the Configuration
column from Enabled to Disabled.
The configuration column controls which of the four protection settings groups is selected as
active through the Active settings cell. A protection setting group can also be disabled in
the configuration column, provided it is not the present active group. Similarly, a disabled
setting group cannot be set as the active group.
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