ABB RED615 Product Manual page 34

Line Differential Protection and Control
RED615
Product version: 2.0
Table 31. Directional EF 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
1) Set Operate delay time = 0.06 s,Operate curve type = IEC definite time, Measurement mode = default (depends on
stage), current before fault = 0.0 x I
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 x I
34
DEFLPDEF
DEFHPDEF
DEFHPDEF and
DEFLPTDEF:
I = 2 x set Start
Fault
value
, f = 50 Hz, earth-fault current with nominal frequency injected from
n n
, Start value multiples in range of 1.5 to 20
n
Value
Depending on the frequency of the current
measured: f ±2Hz
n
Current:
±1.5% of the set value or ±0.002 x I
Voltage
±1.5% of the set value or ±0.002 x U
Phase angle:
±2°
Current:
±1.5% of the set value or ±0.002 x I
(at currents in the range of 0.1...10 x I
±5.0% of the set value
(at currents in the range of 10...40 x I
Voltage:
±1.5% of the set value or ±0.002 x U
Phase angle:
±2°
Minimum Typical
61 ms 64 ms
< 40 ms
Typical 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: -50dB at f = n x f
n
...
Peak-to-Peak: No suppression
1MRS756500 B
Issued: 03.07.2009
n
n
n
)
n
)
n
n
Maximum
66 ms
3)
, where n = 2, 3, 4, 5,
ABB