Siemens SIPROTEC 4 Manual page 399

EPTR/TNP Tripping Time Characteristic
[7SJ80_knickpkt-kennlinie, 1, en_US]
Figure 4-11
EPTR Trip Time characteristics
for a primary short circuit current between:
0.5 A; 6 A
Maximum Tolerance
Maximum Tolerance
6 A; 80 A
Maximum Tolerance
Maximum Tolerance
80 A; 200 A
Maximum Tolerance
Maximum Tolerance
200 A; 300 A
Maximum Tolerance
Maximum Tolerance
300 A; 1000 A
Maximum Tolerance
Maximum Tolerance
SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017
Tripping Time Characteristic Curves of the Inverse-Time Ground-Fault Protection with Loga-
rithmic-Inverse Knee-Point Characteristic Curve, Example EPTR
t = 88.1 x (Ir)
t + = 105.7 x (Ir)
t - = 70.5 x (Ir)
t = 160 x (Ir)
t + = 203.7 x (Ir)
t - = 118.3 x (Ir)
t = 160 x (Ir)
t + = 175.8 x (Ir)
t - = 143.9 x (Ir)
t = 0.80
t + = 0.88
t - = 0.72
t = 0.80
t + = 0.58 x (Ir)
t - = 1.26 x (Ir)
4.14 Ground Fault Detection (Sensitive/Insensitive)
-2/3
-2/3
-2/3
-1
-1.034
-0.956
-1
-1.000
-1.000
-0.073
-0.098
Technical Data
399