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
512
4.16
Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
Displacement Voltage Pickup for All Types of Ground Faults
Phase Detection for Ground Faults on an Ungrounded System
Ground Fault Pickup for All Types of Ground Faults (Definite Time Characteristic)
Displacement voltage, measured
V
0
1.8 V to 170.0 V or
∞
(disabled) (7SJ62)
V0 0.4 V to 200.0 V or
∞
(disabled) (7SJ64)
Increments 0.1V
Displacement voltage, calculated
VV
GND
> 10.0 V to 225.0 V
Increments 0.1V
Pickup delay T-DELAY Pickup
0.04 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)
V
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
Measuring Principle
Voltage measurement (phase-ground)
V
PHASE MIN
(Ground Fault Phase)
10 V to 100 V
Increments 1V
V
PHASE MAX
(Healthy Phase)
10 V to 100 V
Increments 1V
Measurement Tolerance acc. to VDE 0435, Part 303 3 % of setting value or 1 V
Pickup current 50Ns-2 PICKUP
for sensitive transformer
for normal 1-A transformer
for normal 5-A transformer
0.001 A to 1.500 A
0.05 A to 35.00 A
0.25 A to 175.00 A
Increments 0.001 A
Increments 0.01 A
Increments 0.05 A
Time Delay 50Ns-2 DELAY
0.00 s to 320.00 s or
∞
(disabled)
Increments 0.01 s
Pickup current 50Ns-1 PICKUP
for sensitive transformer
for normal 1-A transformer
for normal 5-A transformer
0.001 A to 1.500 A
0.05 A to 35.00 A
0.25 A to 175.00 A
Increments 0.001 A
Increments 0.01 A
Increments 0.05 A
Time 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 50Ns >50 mA
Measurement Tolerance
2 % of setting value or 1 mA
Operating Time Tolerance
1 % of setting value or 10 ms
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