7XR8004 – Resistor Coupling Unit for 7XT71
The 7XR8004 resistor coupling unit is the necessary accessory for the 1 to 3 Hz rotor ground-fault protection
together with the 7XT71 (1 to 3 Hz) generator and the 7UM62/7UM85 machine protection relays.
This device replaces the previous 7XR6004-0*A00 resistor unit, allowing higher excitation voltages at a
reduced size.
2.1 Block Diagram (new 7XR8004) 26
2.2 Connection Notes 27
2.3 Construction Properties 28
2.4 Technical Data 32
2.5 Electrical Tests 33
2.6 Mechanical Tests 34
2.7 Environmental Conditions 35
2.8 Protection Degree according to IEC 60529 36
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 0 0 4 - 0 A 0 0
Housing
Panel surface mounting housing with screw terminals → B
2
SIPROTEC, Coupling Units for Generator Protection, Manual 25
C53000-H5040-C072-1, Edition 09.2018
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