Directional Earth-Fault Protection (Defxpdef) - ABB REX640 Product Manual

REX640
Product version: 1
Table 58. Directional earth-fault protection (DEFxPDEF)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Operate time accuracy in inverse time mode
Suppression of harmonics
Operate curve type = IEC definite time, Measurement mode = default (depends on stage), current before fault = 0.0 × I
1) Set
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
ABB
DEFLPDEF
DEFHPDEF
DEFHPDEF
Start value
I = 2 × set
Fault
DEFLPDEF
Start value
I = 2 × set
Fault
Start value multiples in range of 1.5...20
Value
Depending on the frequency of the measured current: f
Current:
±1.5% of the set value or ±0.002 × I
Voltage
±1.5% of the set value or ±0.002 × U
Phase angle:
±2°
Current:
±1.5% of the set value or ±0.002 × I
(at currents in the range of 0.1...10 × I
±5.0% of the set value
(at currents in the range of 10...40 × I
Voltage:
±1.5% of the set value or ±0.002 × U
Phase angle:
±2°
Minimum Typical
42 ms 46 ms
58 ms 62 ms
Typically 40 ms
Typically 0.96
<30 ms
±1.0% of the set value or ±20 ms
±5.0% of the theoretical value or ±20 ms
RMS: No suppression
DFT: -50 dB at f = n × f , where n = 2, 3, 4, 5,...
n
Peak-to-Peak: No suppression
, f = 50 Hz, earth-fault current with nominal frequency injected from
n n
1MRS759144 A
±2 Hz
n
n
n
n
)
n
)
n
n
Maximum
49 ms
66 ms
3)
47