ABB RELION 615 Series Product Manual page 42

Transformer Protection and Control
RET615
Product version: 5.0 FP1
Table 44. Stabilized and instantaneous differential protection for two-winding transformers (TR2PTDF) main settings
Parameter
High operate value
Low operate value
Slope section 2
End section 2
Restraint mode
Start value 2.H
Start value 5.H
Operation
Winding 1 type
Winding 2 type
Zro A elimination
Table 45. Numerically stabilized low-impedance restricted earth-fault protection (LREFPNDF)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Suppression of harmonics
1) Current before fault = 0.0, f = 50 Hz, results based on statistical distribution of 1000 measurements
n
2) Includes the delay of the signal output contact
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Function
TR2PTDF
TR2PTDF
TR2PTDF
TR2PTDF
TR2PTDF
TR2PTDF
TR2PTDF
TR2PTDF
TR2PTDF
TR2PTDF
TR2PTDF
Operate value
I = 2.0 × set
Fault
Value (Range)
500...3000 %I
r
5...50 %I
r
10...50%
100...500 %I
r
5 = Waveform
6 = 2.h + waveform
8 = 5.h + waveform
9 = 2.h + 5.h + wav
7...20%
10...50%
1 = on
5 = off
1 = Y
2 = YN
3 = D
4 = Z
5 = ZN
1 = y
2 = yn
3 = d
4 = z
5 = zn
1 = Not eliminated
2 = Winding 1
3 = Winding 2
4 = Winding 1 and 2
Value
Depending on the frequency of the measured current: f
±2.5% of the set value or ±0.002 x I
Minimum Typical
37 ms 41 ms
Typically 40 ms
Typically 0.96
<35 ms
±1.0% of the set value or ±20 ms
DFT: -50 dB at f = n × f , where n = 2, 3, 4, 5, ...
n
1MRS756891 M
Step
10
1
1
1
-
1
1
-
-
-
-
±2 Hz
n
n
Maximum
45 ms
ABB