7XR81 – Coupling Device for Rotor Ground-Fault
Protection
The 7XR81 coupling unit is the necessary accessory for the rotor ground-fault protection with the
7UM62/7UM85 machine protection relays.
This device replaces the previous 7XR6100-0*A00 coupling unit and the 3PP1336-0DZ series resistor in one
device.
1.1 Block Diagram 12
1.2 Connection Notes 13
1.3 Construction Properties 15
1.4 Connection Examples 18
1.5 Technical Data 19
1.6 Electrical Tests 20
1.7 Mechanical Tests 21
1.8 Environmental Conditions 22
1.9 Protection Degree according to IEC 60529 23
Ordering Information
Use the following table for ordering the device:
Order No. / MLFB
Pos. 1 2 3 4 5 6 7 - 8 9 10 11 12
7 X R 8 1 0 0 - 0 A 0 0
Housing
Panel surface mounting housing with screw terminals → B
Panel flush mounting housing with screw terminals → C
1
SIPROTEC, Coupling Units for Generator Protection, Manual 11
C53000-H5040-C072-1, Edition 09.2018
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