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1
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
1.2
Connection Notes
1.3
Construction Properties
1.4
Connection Examples
1.5
Technical Data
1.6
Electrical Tests
1.7
Mechanical Tests
1.8
Environmental Conditions
1.9
Protection Degree according to IEC 60529
Ordering Information
Use the following table for ordering the device:
Order No. / MLFB
Pos.
1
7
Housing
SIPROTEC, Coupling Units for Generator Protection, Manual
C53000-H5040-C072-1, Edition 09.2018
2
3
4
5
X
R
8
1
Panel surface mounting housing with screw terminals → B
Panel flush mounting housing with screw terminals → C
6
7
-
8
0
0
-
0
9
10
11
12
A
0
0
12
13
15
18
19
20
21
22
23
11
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