Table 58. Directional earth-fault protection (DEFxPDEF)
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured current: f
n
±2 Hz
DEFLPDEF
Current:
±1.5% of the set value or ±0.002 × I
n
Voltage
±1.5% of the set value or ±0.002 × U
n
Phase angle:
±2°
DEFHPDEF
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
I
Fault
= 2 × set
Start value
42 ms
46 ms
49 ms
DEFLPDEF
I
Fault
= 2 × 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: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
Peak-to-Peak: No suppression
1)
Set
Operate curve type = IEC definite time, Measurement mode = default (depends on stage), current before fault = 0.0 × I
n
, f
n
= 50 Hz, earth-fault current with nominal frequency injected from
random phase angle, results based on statistical distribution of 1000 measurements
2)
Includes the delay of the signal output contact
3)
Maximum
Start value = 2.5 × I
n
,
Start value multiples in range of 1.5...20
1MRS759144 A
REX640
Product version: 1
ABB
47
Summary of Contents for RELION REX640
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