Siemens SIPROTEC 4 - Page 486

Ground Fault Pickup for All Types of Ground Faults (Inverse Time Characteristic Logarithmic Inverse with Knee
Point)
Pickup Current 50Ns
for sensitive transformer
for normal 1-A transformer
for normal 5-A transformer
0.003 A to 0.500 A
0.05 A to 4.00 A
0.25 A to 20.00 A
Increments
0.001 A
Increments
0.01 A
Increments
0.05 A
Minimum time 51Ns T min 0.10 s to 30.00 s Increments 0.01
s
Pickup current51Ns I T min
for sensitive transformer
for normal 1-A transformer
for normal 5-A transformer
0.003 A to 1.400 A
0.05 A to 20.00 A
0.25 A to 100.00 A
Increments
0.001 A
Increments 0.01
A
Increments 0.05
A
Knee-point time 51Ns T knee 0.20 s to 100.00 s Increments
0.01 s
Pickup current 51Ns I T knee
for sensitive transformer
for normal 1-A transformer
for normal 5-A transformer
0.003 A to 0.650 A
0.05 A to 17.00 A
0.25 A to 85.00 A
Increments
0.001 A
Increments 0.01
A
Increments 0.05
A
Maximum time 51Ns T max 0.00 s to 30.00 s Increments
0.01 s
Time factor 51Ns TD 0.05 s to 1.50 s Increments
0.01 s
Characteristics see Figure 2-95
Tolerances
Times
inv 5 % ± 15 ms
def. 1 % of setting value or 10 ms
Technical Data
4.17 Ground Fault Detection (Sensitive/Insensitive)
486 SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016