7XR87 Voltage Divider for Excitation Voltage
The 7XR87 coupling unit is used for interfacing the excitation voltage of a generator to the DC measurement
inputs of the 7UM62/7UM85 machine protection relays.
The 7XR87 allows the application of different voltage-divider ratios. Thus, an optimal adaption of the protec-
tion on different excitation voltages is possible. Additionally, the coupling unit contains components for
reducing harmonics and transients from the excitation circuit.
This device replaces the previous 3PP1326-0BZ-K2Y (10:1, 20:1 voltage divider).
4.1 Block Diagram 48
4.2 Connection Notes 49
4.3 Construction Properties 52
4.4 Technical Data 55
4.5 Electrical Tests 56
4.6 Mechanical Tests 57
4.7 Environmental Conditions 58
4.8 Protection Degree according to IEC 60529 59
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 7 0 0 - 0 A 0 0
Housing
Panel surface mounting housing with screw terminals → B
Panel flush mounting housing with screw terminals → C
4
SIPROTEC, Coupling Units for Generator Protection, Manual 47
C53000-H5040-C072-1, Edition 09.2018
To Next Page
Loading...
Need help?
General
