Current value Ι1, Ι for the angle correction
for sensitive transformer
for normal 1-A transformer
for normal 5-A transformer
0.001 A to 1.600 A
0.05 A to 35.00 A
0.25 A to 175.00 A
Increments 0.001 A
Increments 0.01 A
Increments 0.05 A
Note: Due to the high sensitivity the linear range of the measuring input Ι
N
with integrated sensitive input
transformer is from 0.001A to 1.6 A. For currents greater than 1.6 A, correct directionality can no longer be
guaranteed.
Logarithmic inverse trip time characteristic
[kennlinie-amz-log-invers-050803, 1, en_US]
Figure 4-11 Trip time characteristics of inverse time ground fault protection with logarithmic inverse time
characteristic
Logarithmic
inverse
t =51Ns Tmax – 51Ns TIME DIAL · 51Ns(Ι/51Ns PICKUP)
Note:
For Ι/51Ns PICKUP > 35 the time applies for Ι/51Ns PICKUP = 35; for t < 51Ns Tmin
the time 51Ns Tminapplies.
Technical Data
4.17 Ground Fault Detection (Sensitive/Insensitive)
SIPROTEC 4, 7SJ62/64, Manual 491
C53000-G1140-C207-8, Edition 08.2016
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