
31
—
Table 34. Directional earth-fault protection (DEFxPDEF)
Characteristic
Value
Operation accuracy
DEFLPDEF
Depending on the frequency of the measured current: f
n
±2 Hz
Current:
±1.5% of set value or ±0.002 x I
n
Voltage:
±1.5% of set value or ±0.002 x I
n
Phase angle:
±2°
DEFHPDEF
(1)
Current:
±1.5% of the set value or ±0.002 × I
n
(at currents in the range of 0.1…10 × I
n
)
±5.0% of the set value
(at currents in the range of 10…40 × I
n
)
Voltage:
±1.5% of the set value or ±0.002 × U
n
Phase angle:
±2°
Start time
1) 2)
Minimum
Typical
Maximum
DEFHPDEF
(1)
I
Fault
= 2 x set Start value
42 ms
46 ms
49 ms
DEFLPDEF
I
Fault
= 2 x set Start value
58 ms
62 ms
66 ms
Reset time
Typically 40 ms
Reset ratio
Typically 0.96
Retardation time
< 30 ms
Operate time accuracy in definite time mode
±1.0% of the set value or ±20 ms
Operate time accuracy in inverse time mode
±5.0% of the theoretical value or ±20 ms
3)
Suppression of harmonics
RMS: No suppression
DFT: -50dB at f = n x f
n
, where n = 2, 3, 4, 5,…
Peak-to-Peak: No suppression
1 Not included in REM615
2 Set Operate delay time = 0.06 s,Operate curve type = IEC definite time, Measurement mode = default (depends on stage), current before fault = 0.0 × In, fn = 50 Hz, earth-fault current
with nominal frequency injected from random phase angle, results based on statistical distribution of 1000 measurements
3 Includes the delay of the signal output contact
4) Maximum Start value = 2.5 × In, Start value multiples in range of 1.5...20
1 Not included in REM615
2 For further reference, see the Operating characteristics table
—
Table 35. Directional earth-fault protection (DEFxPDEF) main settings
Parameter
Function
Value (range)
Step
Start value
DEFLPDEF
0.010...5.000 × I
n
0.005
DEFLPDEF
(1)
0.10...40.00 × I
n
0.01
Directional mode
DEFLPDEF and DEFHPDEF
1 = Non-directional
2 = Forward
3 = Reverse
—
Time multiplier
DEFLPDEF
0.05...15.00
0.01
DEFHPDEF
(1)
0.05...15.00
0.01
Operate delay time
DEFLPDEF
50...200000 ms
10
DEFHPDEF
(1)
40...200000 ms
10
Operating curve type
(2)
DEFLPDEF
Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
DEFHPDEF
(1)
Definite or inverse time
Curve type: 1, 3, 5, 15, 17
Operation mode
DEFxPDEF
1 = Phase angle
2 = IoSin
3 = IoCos
4 = Phase angle 80
5 = Phase angle 88