Current And Voltage Inputs - Siemens 7SG11 Manual

Table 2-3 System Frequency Setting
Sub-menu: System Config.
Setting name
Power System Frequency
2.2.3

Current and Voltage Inputs

Input Type Selection
On 3-pole models and 4-pole models with an SEF/REF input, the user can set the 'pole B' current input to be
either the phase-fault B input (P/F) or an earth-fault input (E/F) using the System Config.:Set Pole B Type setting. When
the input is set to P/F all settings related to the earth-fault will be hidden from view.
When an SEF/REF input is provided, its designation can be set to show 'SEF' or 'REF' using the System
Config.:Earth Fault Mode Select setting. This changes only the text identifier which appears in various locations within
the menu system, not the functionality of the element.
Phase Rotation
The setting System Config.:Phase Rotation allows the user to select the applicable system phase rotation.
Ratings and CT/VT Ratios
The current input for each pole can be user selected for operation from a 1A or 5A CT secondary. The
appropriate connections are made on the relay terminals. The appropriate rating should be set using the System
Config.:P/F [E/F] [SEF/REF] Rating (In) settings to allow the Argus to correctly calculate the measured current for
display purposes. This setting will not affect the Protection Menu setting's display if they are displayed as xIn,
however see Current Display Bases below.
CT and VT ratios can be set, allowing the relay to calculate primary currents and voltages for display.
VT settings appear on Argus 2 relays with type II directional elements only. In addition to the VT ratio setting a VT
connection setting allows a three phase-earth VT to be used, with the relay calculating the neutral voltage
internally.
Current Display Bases
The System Config.:Current Display setting allows the overcurrent protection settings to be displayed in primary amps,
secondary amps, or xIn i.e. multiple of relay nominal current. The user can thus enter settings in the most
convenient units. The Argus will perform the necessary conversion if the display units are changed.
Note. For the Argus to correctly calculate these values, the nominal CT Secondary Ratings and CT Ratios must
be correctly entered, see above.
Table 2-4 Current and Voltage Input Settings
Sub-menu: System Config.
Setting name
Set Pole B Type
Earth Fault Mode Select
Phase Rotation
P/F Rating (In)
E/F Rating (In)
SEF/REF Rating (In)
P/F CT Ratio
E/F CT Ratio
SEF/REF CT Ratio
VT Connection
VT Primary
VT Secondary
Current Display
©2013 Siemens Protection Devices Limited
Range (bold = default)
50, 60
Range (bold = default)
P/F, E/F
SEF, REF
A-B-C, A-C-B
1, 5
5, 10, 15...300...10000 :
Ph-N, Ph-Ph
0, 1...9 for each of 6 digits
(default: 11000)
40.0, 40.1...70.0,
70.5...110.0...150.0
xIn, PRIMARY, SECONDARY
7SG11 Argus Technical Reference
Units Notes
Hz
Units Notes
Some Argus 1 and 2 models only
Models with SEF only
Argus 2 (type II) only
A
1, 5
V
Argus 2 (type II) only
V
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