Areva MiCOM P441, Техническое руководство

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P44x/EN IT/E33 Introduction
Page 12/24 MiCOM P441/P442 & P444
3.4 Password protection
The menu 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 summarised 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
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
As level 1 plus: Password 2 required
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.
Entry of the password is achieved either by a prompt when a setting change is attempted, or
by moving to the ‘Password’ cell in the ‘System data’ column of the menu. The level of
access is independently enabled for each interface, that is to say if level 2 access is enabled
for the rear communication port, the front panel access will remain at level 0 unless the
relevant password is entered at the front panel. The access level enabled by the password
entry will time-out independently for each interface after a period of inactivity and revert to
the default level. If the passwords are lost an emergency password can be supplied - contact
AREVA with the relay’s serial number. The current level of access enabled for an interface
can be determined by examining the 'Access level' cell in the 'System data' column, the
access level for the front panel User Interface (UI), can also be found as 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 level1, preventing write access to the relay settings without the correct
password. The default menu access level is set in the ‘Password control’ cell which is found
in the ‘System data’ column of the menu (note that this setting can only be changed when
level 2 access is enabled).
3.5 Relay configuration
The relay is a multi-function device which 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.
The column also allows all of the setting values in one group of protection settings to be
copied to another group.
To do this firstly set the ‘Copy from’ cell to the protection setting group to be copied, then set
the ‘Copy to’ cell to the protection group where the copy is to be placed. The copied settings
are initially placed in the temporary scratchpad, and will only be used by the relay following
confirmation.