Siemens SIPROTEC 7SJ62 Manual page 513

Ground Fault Pickup for All Types of Ground Faults (Inverse Time Characteristic)
User-defined Curve (defined by a maximum of 20 value pairs of current and time delay)
Pickup Current 51Ns
for sensitive transformer
for normal 1-A transformer
for normal 5-A transformer
Time multiplier T
Pickup Threshold
Dropout ratio
Measurement Tolerance
Operating Time Tolerance in Linear Range
Ground Fault Pickup for All Types of Ground Faults (Inverse Time Characteristic Logarithmic inverse)
Pickup Current 50Ns
For sensitive transformer
For normal 1-A transformer
For normal 5-A transformer
Starting current factor 51Ns Startpoint
Time factor 51Ns TIME DIAL
Maximum time 51Ns Tmax
Minimum time 51Ns Tmin
Characteristics
Tolerances
Times
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
Minimum time 51Ns T min
Pickup current 51Ns I T min
for sensitive transformer
for normal 1-A transformer
for normal 5-A transformer
Knee-point time 51Ns T knee
Pickup current 51Ns I T knee
for sensitive transformer
for normal 1-A transformer
for normal 5-A transformer
Maximum time 51Ns T max
Time factor 51Ns TD
Characteristics
Tolerances
Times
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
51Ns
inv.
def.
inv.
def.
4.16 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
0.001 A to 1.400 A
0.05 A to 4.00 A
0.25 A to 20.00 A
0.10 s to 4.00 s or ∞ (disabled)
Approx. 1.10 · I
51Ns
Approx. 1.05 · I for I
51Nsp 51Ns
2 % of setting value or 1 mA
7 % of reference value for 2 ≤ I/I
erance, or 70 ms
0.001 A to 1.400 A
0.05 A to 4.00 A
0.25 A to 20.00 A
1.0 to 4.0
0.05 s to 15.00 s; ∞
0.00 s to 30.00 s
0.00 s to 30.00 s
see Figure 2-89
5 % ± 15 ms for 2 ≤ I/I
51Ns
1 % of setting value or 10 ms
0.003 A to 0.500 A
0.05 A to 4.00 A
0.25 A to 20.00 A
0.10 s to 30.00 s
0.003 A to 1.400 A
0.05 A to 20.00 A
0.25 A to 100.00 A
0.20 s to 100.00 s
0.003 A to 0.650 A
0.05 A to 17.00 A
0.25 A to 85.00 A
0.00 s to 30.00 s
0.05 s to 1.50 s
see Figure 2-90
5 % ± 15 ms
1 % of setting value or 10 ms
Technical Data
Increments 0.001 A
Increments 0.01 A
Increments 0.05 A
Increments 0.01 s
> 50 mA
≤ 20 + 2 % current tol-
51Ns
Increments 0.001 A
Increments 0.01 A
Increments 0.05 A
Increments 0.1
Increments 0.01 s
Increments 0.01 s
Increments 0.01 s
≤ 20 and 51Ns TIME DIAL ≥ 1 s
Increments 0.001 A
Increments 0.01 A
Increments 0.05 A
Increments 0.01 s
Increments 0.001 A
Increments 0.01 A
Increments 0.05 A
Increments 0.01 s
Increments 0.001 A
Increments 0.01 A
Increments 0.05 A
Increments 0.01 s
Increments 0.01 s
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