Ground Fault Protection 64, 67N(S), 50N(S), 51N(S) - Siemens SIPROTEC 7SK80 Manual

Technical Data

4.15 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)

4.15 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
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
376
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
E50417-G1140-C344-A4, Release date 08.2010
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
SIPROTEC, 7SK80, Manual