ABB REX640 Product Manual page 42

REX640
Product version: 1
Table 46. Current reversal and weak-end infeed logic for residual overcurrent (RCRWPSCH) main settings
Parameter
Reversal mode
Wei mode
Residual voltage Val
Reversal time
Reversal reset time
Wei Crd time
Table 47. Line differential protection with in-zone power transformer (LNPLDF)
Characteristics
1)
Operation accuracy
2)3)
High stage, operate 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) With the symmetrical communication channel (as when using dedicated fiber optic).
2) Without additional delay in the communication channel (as when using dedicated fiber optic).
3) Measured with static power output. When differential current = 2 ×
4) Low operate value multiples in the range of 1.5...20
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Function
RCRWPSCH
RCRWPSCH
RCRWPSCH
RCRWPSCH
RCRWPSCH
RCRWPSCH
High operate value and f
Value (Range)
1 = Off
2 = On
1 = Off
3 = Echo
4 = Echo and Operate
0.05...0.70 × U
n
0...60000 ms
0...60000 ms
0...60000 ms
Value
Depending on the frequency of the measured current: f
Low stage ±2.5% of the set value
High stage ±2.5% of the set value
Minimum Typical
20 ms 23 ms
Typically 40 ms
Typically 0.96
<40 ms
±1.0% of the set value or ±20 ms
±5.0% of the set 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
= 50 Hz with galvanic pilot wire link + 5 ms.
n
1MRS759144 A
Step
-
-
0.01
10
10
10
±2 Hz
n
Maximum
27 ms
4)
ABB