Siemens SIPROTEC 4 7UT6 Series Manual page 520

Differential protection
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Connection Examples
C.2 Voltage Transformer Connection Examples
[7ut613-633-spwandler-dreieckw-030324-rei, 1, en_GB]
Figure C-18
520
Voltage connections to three wye-connected voltage transformers with additional open-delta
windings (e-n–windings; only in 7UT613 and 7UT633)
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016

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