ABB RELION REM615 - Page 32

Table 29. Directional earth-fault protection (DEFxPDEF)
Characteristic Value
Operation accuracy Depending on the frequency of the current
measured: f
n
±2 Hz
DEFLPDEF
Current:
±1.5% of the set value or ±0.002 x I
n
Voltage
±1.5% of the set value or ±0.002 x U
n
Phase angle:
±2°
DEFHPDEF
1)
Current:
±1.5% of the set value or ±0.002 x I
n
(at currents in the range of 0.1…10 x I
n
)
±5.0% of the set value
(at currents in the range of 10…40 x I
n
)
Voltage:
±1.5% of the set value or ±0.002 x U
n
Phase angle:
±2°
Start time
2)3)
Minimum Typical Maximum
DEFHPDEF
1)
I
Fault
= 2 x set Start
value
42 ms 44 ms 46 ms
DEFLPDEF
I
Fault
= 2 x set Start
value
61ms 64 ms 66 ms
Reset time < 40 ms
Reset ratio Typical 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
4)
Suppression of harmonics RMS: No suppression
DFT: -50 dB 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 x 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
3) Includes the delay of the signal output contact
4)
Maximum Start value = 2.5 x I
n
, Start value multiples in range of 1.5 to 20
Motor Protection and Control 1MRS756890 D
REM615
Product version: 3.0 Issued: 2010-06-29
32 ABB