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10.7
Sensitive Ground Fault Detection (64, 50Ns, 67Ns)
Displacement Volt-
age Element Char-
acteristics - For all
Types of Ground
Faults
Phase Detection
for Ground Faults on
an Ungrounded Sys-
tem
Ground Fault Pick-
up
for All Types of
Ground Faults
7SJ63 Manual
C53000-G1140-C120-1
Displacement Voltage, Measured
Displacement Voltage, Calculated
Pickup Delay Time
Additional Trip Delay
Measuring time (Inherent Pickup Delay) approx. 60 ms
Dropout Value
Measurement Tolerance
Ve> (measured):
3V
> (calculated):
0
Operating Time Tolerances
The set times are pure delay times
Measuring Principle
V
(ground fault phase)
PHASE MIN
V
(healthy phases)
PHASE MAX
Measurement Tolerance
as per VDE 0435, Part 303
Definite Time Characteristic
Pickup Current
Delay Time
Pickup Current
Delay Time
Inherent Pickup Time
Dropout/Pickup (ratio)
Measurement Tolerance
Operating Time Tolerance
User-defined Characteristic
Pickup Current
Time multiplier
Pickup Threshold
Ve> 1.8 V to 130.0 V (increments 0.1V)
3V
>10.0 V to 225.0 V (increments 0.1V)
O
T
0.04 s to 320.00 s
Delay Pickup
or ∞ (does not pickup)
T
0.10 s to 40000.00 s (increments 0.01 s)
Delay
∞
or
(ineffective)
[0.95 · pickup value] or
[Minimum 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 to ground)
10 V to 100 V
10 V to 100 V
3% of setting value, or 1 V
50-Ns-1
0.003 A to 1.500 A (increments 0.001 A)
50-Ns-1
0.00 s to 320.00 s (increments 0.01 s)
∞
or
(ineffective)
50-Ns-2
0.003 A to 1.500 A (increments 0.001 A)
50-Ns-2
0.00 s to 320.00 s (increments 0.01 s)
∞
or
(ineffective)
≤ 60 ms (non-directional)
≤ 80 ms (directional)
approx. 0.95 for I
2 % of setting value or 1 mA
1 % of setting value or 20 ms
user-specified characteristic (defined
by maximum of 20 pairs of current–
trip time values)
51 Ns
0.003 A to 1.400 A (increments 0.001 A)
51 Ns
0.10 to 4.00
or ∞ (ineffective)
approx. 1.10 · I
Technical Data
(increments 0.01 s)
(increments 1 V)
(increments 1 V)
≥ 50 mA
Ns
(increments 0.01)
Nsp
10-21
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