Real Time Clock; Time Synchronisation - Data Communication Interface; Time Synchronisation - Binary Input; Settings Groups - Siemens 7SR10 Argus Series Manual

6.7

Real Time Clock

Time and date can be set either via the relay fascia using appropriate commands in the System Config menu or
via the data communications channel(s). Time and date are maintained while the relay is de-energised by a back
up storage capacitor. The length of time for which this data will be maintained will depend on such things as
temperature, length of time in service, etc. However the data will be maintained for a minimum of 1.0 day.
In order to maintain synchronism within a substation, the relay can be synchronised to the nearest second or
minute using the communications interface, or a binary input.
The devices without an external synchronization can have a maximum drift of ±2 s/day. The following attribute is
applicable only when no synchronization signal (e.g. IEC 60870-5-103) is received.
Attribute
Accuracy (-10 °C to 60°C)
The default date is set at 01/01/2000 deliberately to indicate the date has not yet been set. When editing the
Time, only the hours and minutes can be edited. When the user presses ENTER after editing the seconds are
zeroed and the clock begins running.
6.7.1 Time Synchronisation – Data Communication Interface
Where the data communications channel(s) is connected the relay can be directly time synchronised using the
global time synchronisation. This can be from a dedicated substation automation system or from 'Reydisp
Evolution' communications support software.
6.7.2 Time Synchronisation – Binary Input
A binary input can be mapped Clock Sync from BI. The seconds or minutes will be rounded up or down to the
nearest vale when the BI is energised. This input is leading edge triggered.
6.8

Settings Groups

The relay provides four groups of settings – Group number (Gn) 1 to 2 for 7SR1003 and 1 to 4 for 7SR1004. At
any one time, only one group of settings can be 'active' – SYSTEM CONFIG >Active Group setting.
It is possible to edit one group while the relay operates in accordance with settings from another 'active' group
using the View/Edit Group setting.
Some settings are independent of the active group setting i.e. they apply to all settings groups. This is indicated
on the top line of the relay LCD, where only the Active Group No. is identified. Where settings are group
dependent this is indicated on the top line of the LCD by both the Active Group No. and the View Group No.
being displayed.
A change of settings group can be achieved both locally at the relay fascia and remotely over the data
communications channel(s) or via a binary input. When using a binary input an alternative settings group is
selected only whilst the input is energised (Select Grp Mode: Level triggered) or latches into the selected group
after energisation of the input (Select Grp Mode: Edge triggered).
Settings are stored in a non-volatile memory.
6.9

Password Feature

The relay incorporates two levels of password protection - one for settings, the other for control functions.
The programmable password feature enables the user to enter a 4 character alpha-numeric code to secure
access to the relay functions. The relay is supplied with the passwords set to NONE, i.e. the password feature is
disabled. The password must be entered twice as a security measure against the accidental changes. Once a
password has been entered then it will be required thereafter to change settings or initiate control commands.
Passwords can be de-activated by using the password to gain access and by entering the password NONE.
Again this must be entered twice to deactivate the security system.
As soon as the user attempts to change a setting or initiate control the password is requested before any changes
are allowed. Once the password has been validated, the user is 'logged on' and any further changes can be
made without re-entering the password. If no more changes are made within 1 hour then the user will
automatically be 'logged off', re-enabling the password feature.
©2018 Siemens Protection Devices Limited
Value
±60 p.p.m
7SR10 Description of Operation
Chapter 1 Page 76 of 77