Siemens SIPROTEC 7XR81 Manual page 31

NOTE
i
i
The recommended maximum cable length is 20 m (65 ft.).
NOTE
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The fuse F1 must have at least the rated voltage of excitation (e.g. 2000 V DC) and be rated for 0.1 A T
(time-lag).
SIPROTEC, Coupling Units for Generator Protection, Manual
C53000-H5040-C072-1, Edition 09.2018
7XR8004 – Resistor Coupling Unit for 7XT71
2.3 Construction Properties
31