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4.15
Ground Fault Detection (Sensitive/Insensitive)
Displacement Voltage Element For all Types of Ground Faults
Displacement voltage, measured
Displacement voltage, calculated
Pickup delay T-DELAY Pickup
Additional tripping delay 64-1 DELAY
Operating time
Dropout value
Measurement tolerance
V0 > (measured)
3V0 > (calculated)
Operating time tolerances
Phase Detection for Ground Faults on an Ungrounded System
Measuring Principle
V
(Ground Fault Phase)
PHASE MIN
V
(Healthy Phase)
PHASE MAX
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
Time delay 50Ns-2 DELAY, 50Ns-1 DELAY
Dropout time delay 50Ns T DROP-OUT
Operating time
Dropout ratio
Measurement tolerance
sensitive
non-sensitive
Operating time tolerance
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
4.15 Ground Fault Detection (Sensitive/Insensitive)
V0 > 1.8 V to 200.0 V
3V
> 10.0 V to 225.0 V
0
0.04 s to 320.00 s or ∞
0.10 s to 40000.00 s or ∞ (dis-
abled)
approx. 50 ms
0.95 or (pickup value – 0.6 V)
3 % of setting value or 0.3 V
3 % of setting value or 3 V
1 % of setting value or 10 ms
Voltage measurement (phase-Ground)
10 V to 100 V
10 V to 100 V
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
0.00 s to 320.00 s or ∞ (dis-
abled)
0.00 s to 60.00 s
≤ 50 ms (non-directional)
≤ 50 ms (directional)
approx. 0.95 for 50Ns > 50 mA
3 % of setting value or 1 mA for I
I
= 5 A
Nom
for setting values < 10 mA approx. 20 %
3 % of setting value or 15 mA for I
for I
= 5 A
Nom
1 % of setting value or 10 ms
Technical Data
Increments 0.1 V
Increments 0.1 V
Increments 0.01 s
Increments 0.01 s
Increments 1V
Increments 1V
Increments 0.001 A
Increments 0.005 A
Increments 0.01 A
Increments 0.05 A
Increments 0.01 s
Increments 0.01 s
= 1 A, or 5 mA for
Nom
= 1 A, or 75 mA
Nom
391
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