Alstom MiCOM P846, Technical Manual

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Settings P846/EN ST/D
MiCOM P846
(ST) 4-5
ST
Menu Text Default Setting Available Settings
Direct Access Enabled
Enabled/Disabled/Hotkey
only/CB Cntrl. only
Defines what CB control direct access is allowed. Enabled implies control via menu,
hotkeys etc.
LCD Contrast 11 0…31
Sets the LCD contrast.
1.1.1 Default settings restore
To restore the default values to the settings in any protection settings group, set the ‘restore
defaults’ cell to the relevant group number. Alternatively it is possible to set the ‘restore
defaults’ cell to ‘all settings’ to restore the default values to all of the relay’s settings, not just
the protection groups’ settings. The default settings will initially be placed in the scratchpad
and will only be used by the relay after they have been confirmed. Note that restoring
defaults to all settings includes the rear communication port settings, which may result in
communication via the rear port being disrupted if the new (default) settings do not match
those of the master station.
1.2 Protection application settings
The protection settings include all the following items that become active once enabled in the
configuration column of the relay menu database:
•
Protection element settings.
•
Fault locator settings.
There are four groups of protection settings, with each group containing the same setting
cells. One group of protection settings is selected as the active group, and is used by the
protection elements. The settings for group 1 is shown.
1.2.1 CT/VT ratios
This settings column contains the primary settings for the protection device.
Setting Range
Menu Text Default Setting
Min. Max.
Step Size
Main VT Primary 735.0 kV 100 1000 kV 1 V
Sets the main potential transformer (PT) input primary voltage.
Main VT Sec’y 120.0 V 80 140 1 V
Sets the main potential transformer (PT) input secondary voltage.
Phase CT Primary 2000 A 1 30 k 1 A
Sets the feeder current transformer input primary current rating.
Phase CT Sec’y 5.000 A 1 5 4 A
Sets the feeder current transformer input secondary current rating.
Phase CT2 Primary 2000 A 1 30 k 1 A
Sets the second current transformer input primary current rating used for the shunt
inductance secondary current measurement.
Phase CT2 Sec’y 1.000 A 1 5 4
Sets the second current transformer input secondary current rating used for the shunt
inductance current measurement.