Technical Data
4.13 Ground Fault Protection 50N(s), 51N(s)
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
348
Logarithmic Inverse Trip Time Characteristics
Figure 4-11 Trip time characteristics of inverse time ground fault protection with logarithmic inverse char-
acteristic
Logarithmic inverse t = 51Ns MAX. TIME DIAL - 51Ns TIME DIAL·ln(I/51Ns PICKUP)
Note: For I/51Ns PICKUP > 35 the time applies for I/51Ns PICKUP = 35
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