Siemens SIPROTEC 4 7SJ61 Manual page 323

Logarithmic Inverse Trip Time characteristic with knee point
[7sj6x_portugal_kennlinie-010704-he, 1, en_US]
Figure 4-12
SIPROTEC 4, 7SJ61, Manual
C53000-G1140-C210-6, Edition 05.2016
Trip-time characteristics of the inverse-time ground fault protection with logarithmic inverse
time characteristic with knee point (example for 51Ns= 0.004 A)
4.13 Ground Fault Detection (Sensitive/Insensitive)
Technical Data
323