Arcteq Generator Commander, Instruction Manual

Page: 286 / 561

Differential function details
Figure. 5.4.27 - 153. Simplified function block diagram of the transformer differential function.
The transformer differential function outputs TRIP and BLOCKED signals from the biased and non-
biased functions as well as the 2
nd
and 5
th
harmonic block activation signals. These signals can be
used in protection applications.
Settings and signals
The settings of the differential function are a combination of transformer monitor and differential stage
function settings. The following table shows the function's settings, including the general settings (in
p.u.) used for pre-calculations.
Table. 5.4.27 - 227. Settings related to the differential function's pre-calculation.
Name Range Step Default Function Description
Idx> LN
mode
1: On
2: Blocked
3: Test
4: Test/Blocked
5: Off
- 1: On -
Set mode of DIF block.
This parameter is visible only when
Allow setting of
individual LN mode is enabled in General menu.
Idx> LN
behaviour
1: On
2: Blocked
3: Test
4: Test/Blocked
5: Off
- - -
Displays the mode of DIF block.
This parameter is visible only when Allow setting of
individual LN mode is enabled in General menu.
Transformer
nominal
0.1...500.0MVA 0.1MVA 1.0MVA All
The nominal MVA of the transformer. This value is
used to calculate the nominal currents onf both the
HV and the LV side.
HV side
nominal
voltage
0.1…500.0kV 0.1kV 110.0kV All
The HV side nominal voltage of the transformer. This
value is used to calculate the nominal currents of the
HV side.
Genera Generattor Commander or Commander
Instruction manual
Version: 2.07
284 © Arcteq Relays Ltd
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