Siemens SIPROTEC 5 Manual page 467

NOTE
i
i
When using the connection type 3-phase-to-phase voltage, the zero-sequence voltage cannot be detected.
[tvvolta6-260313-01.tif, 1, en_US]
Figure A-15
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017
Connection to V-Connected Voltage Transformer (Delta-Connected Device Input Transformer)
and Connection to the Broken-Delta Winding of a Busbar Voltage Transformer
A.5 Connection Examples of Voltage Transformers for Modular Devices
Appendix
467