Siemens SIPROTEC 7SJ62, Manual

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Technical Data
4.16 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008 513
Ground Fault Pickup for All Types of Ground Faults (Inverse Time Characteristic)
Ground Fault Pickup for All Types of Ground Faults (Inverse Time Characteristic Logarithmic inverse)
Ground Fault Pickup for All Types of Ground Faults (Inverse Time Characteristic Logarithmic Inverse with Knee
Point)
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
0.001 A to 1.400 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
Time multiplier T
51Ns
0.10 s to 4.00 s or
∞
(disabled) Increments 0.01 s
Pickup Threshold Approx. 1.10 · I
51Ns
Dropout ratio Approx. 1.05 · I
51Nsp
for I
51Ns
> 50 mA
Measurement Tolerance 2 % of setting value or 1 mA
Operating Time Tolerance in Linear Range 7 % of reference value for 2
≤
I / I
51Ns
≤
20 + 2 % current tol-
erance, or 70 ms
Pickup Current 50Ns
For sensitive transformer
For normal 1-A transformer
For normal 5-A transformer
0.001 A to 1.400 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
Starting current factor 51Ns Startpoint 1.0 to 4.0 Increments 0.1
Time factor 51Ns TIME DIAL 0.05 s to 15.00 s;
∞
Increments 0.01 s
Maximum time 51Ns Tmax 0.00 s to 30.00 s Increments 0.01 s
Minimum time 51Ns Tmin 0.00 s to 30.00 s Increments 0.01 s
Characteristics see Figure 2-89
Tolerances
Times inv. 5 %
±
15 ms for 2
≤
I
/
I
51Ns
≤
20 and
51Ns TIME DIAL
≥
1 s
def. 1 % of setting value or 10 ms
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 current 51Ns 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 2-90
Tolerances
Times inv. 5 %
±
15 ms
def. 1 % of setting value or 10 ms
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