Ground Fault Detection (Sensitive/Insensitive)
Displacement Voltage Pickup for All Types of Ground Faults
Displacement voltage, measured V
0
> 1.8 V to 200.0 V or Increments
0.1 V
Displacement voltage, calculated 3V
0
> 10.0 V to 225.0 V Increments
0.1 V
Pickup delay T-DELAY Pickup 0 s to 320.00 s or ∞ Increments
0.01 s
Additional tripping delay
64-1 DELAY
0.10 s to 40000.00 s or ∞ (disabled) Increments
0.01 s
Operating time approx. 50 ms
Dropout value 0.95 or (pickup value – 0.6 V)
Measurement tolerance
V
0
> (measured)
3V
0
> (calculated)
3 % of setting value or 0.3 V
3 % of setting value or 3 V
Operating time tolerances 1 % of setting value or 10 ms
Phase Detection for Ground Faults on an Ungrounded System
Measuring Principle Voltage measurement (phase-ground)
V
PHASE MIN
(Ground Fault Phase) 10 V to 100 V Increments 1 V
V
PHASE MAX
(Healthy Phase) 10 V to 100 V Increments 1 V
Measurement Tolerance acc. to VDE 0435, Part
303
3 % of setting value or 1 V
Ground Fault Pickup for All Types of Ground Faults (Definite Time Characteristic)
Pickup current
50Ns-2 PICKUP, 50Ns-1 PICKUP
for sensitive 1 A transformer
for sensitive 5 A transformer
for normal 1 A transformer
for normal 5 A transformer
0.001 A to 1.600 A
0.005 A to 8.000 A
0.05 A to 35.00 A
0.25 A to 175.00 A
Increments 0.001 A
Increments 0.005 A
Increments 0.01 A
Increments 0.05 A
Time delay50Ns-2 DELAY, 50Ns-1 DELAY 0.00 s to 320.00 s or ∞
(disabled)
Increments 0.01 s
Dropout time delay 50Ns T DROP-OUT 0.00 s to 60.00 s Increments 0.01 s
Operating time ≤ 50 ms (non-directional)
≤ 50 ms (directional)
Dropout ratio
approx. 0.95 for ΙNs > 50 mA
Measurement tolerance
sensitive
for Ι
Nom
= 1 A
3 % of setting value or 1 mA
Ι
Nom
= 5 A
3 % of setting value or 5 mA
for setting values < 10 mA ca. 20 %
non-sensitive
for Ι
Nom
= 1 A
3 % of setting value or 15 mA
for Ι
Nom
= 5 A
3 % of setting value or 75 mA
Operating time tolerance 1 % of setting value or 10 ms
4.14
Technical Data
4.14 Ground Fault Detection (Sensitive/Insensitive)
SIPROTEC 4, 7SJ80, Manual 395
E50417-G1140-C343-A8, Edition 12.2017
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