ABB Relion 630 Series RET630 Product Manual page 35

ABB
Transformer Protection and Control
RET630
Product version: 1.1
Table 36. 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
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
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
At the frequency f = f
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°
Typical 54 ms (±15 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: -50 dB at f = n x f
n
...
Peak-to-Peak: No suppression
1MRS756978 D
Issued: 2011-05-18
n
n
n
)
n
)
n
n
3)
, where n = 2, 3, 4, 5,
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