Siemens Reyrolle 7SR5 Manual page 300

Protection and Automation Functions
5.21 87GH Restricted Earth-Fault Protection – High-Impedance
•
Parameter: 87GH-n Setting
Default setting: 0.02 x I
The current setting is dependent on a number of factors including the external component values relay
settings and values of circuit components can be calculated in the following order:
[dw_7SR5_function87GHApplicationAndSettingNotes2, 1, en_US]
Figure 5-45
300
(0.02 ⋅ I )
n rated
Procedure For Calculating High-Impedance Differential Protection Settings
Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019