Mounting and Connections
General
WARNING
Warning of improper transport, storage, installation, and application of the device.
Non-observance can result in death, personal injury or substantial property damage.
²
Trouble free and safe use of this device depends on proper transport, storage, installation, and appli-
cation of the device according to the warnings in this instruction manual.
²
Of particular importance are the general installation and safety regulations for work in a high-voltage
environment (for example, VDE, IEC, EN, DIN, or other national and international regulations). These
regulations must be observed.
Configuration Information
Prerequisites
For installation and connections the following conditions must be met:
The rated device data has been tested as recommended in the SIPROTEC 4 System Description and their
compliance with the Power System Data is verified.
Connection Variants
General diagrams are shown in the Appendix B Terminal Assignments. Connection examples for current and
voltage transformer circuits are provided in Appendix C Connection Examples. It must be checked that the
settings for configuration (Subsection 2.1.3 Functional Scope) and the Power System Data (Subsection
2.1.4 Power System Data 1) match the connections to the device.
Protected Object
The setting of the protected object (address 105) must correspond to the object to be protected. An incorrect
setting may cause unforeseeable reactions by the device.
Please note that for auto-transformers PROT. OBJECT = autotransf. and
not 3-phase transf. must be set.
For single-phase transformer , the centre phase L2 is not used.
Currents
Connection of the CT currents depends on the mode of application.
With 3-phase connection the three phase currents are assigned to the measuring locations. Connection exam-
ples for the various protected objects are provided in the Appendix C Connection Examples. Please refer also
to the Appendix B Terminal Assignments for the general diagrams that apply to this device. Check that the
measuring locations are correctly assigned to the sides of the protected object and to the measuring inputs on
the device.
With 2-phase connection of a single-phase transformer the centre phase (ΙL2) will not be used. Appendix
C Connection Examples shows connection examples. Even if there is only one current transformer, both
phases (ΙL1 and ΙL3) will be used. Also observe the General Diagrams in Appendix B Terminal Assignments
that apply to the current device.
With 1-phase busbar protection the measuring inputs are each assigned to one busbar feeder. Appendix
C Connection Examples illustrates an example for one phase. The other phases are to be connected accord-
ingly. Also observe the General Diagrams in Appendix B Terminal Assignments that apply to the current
device.
For the CT connection, please observe that the rated output current of the summation transformers is usually
100 mA. The measuring inputs of the device have to be matched accordingly. Consider also that in 7UT612
3.1
3.1.1
Mounting and Commissioning
3.1 Mounting and Connections
310 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
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