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Table 55. Transformer differential protection for two-winding transformers (TR2PTDF)
Characteristic
Value
Operation accuracy
At the frequency f = f
n
±1.5% of the set value or ±0.002 × I
n
Operate time
1)2)
Biased low stage
Instantaneous high stage
Typical 35 ms (±5 ms)
Typical 17 ms (±5 ms)
Reset time
< 30 ms
Reset ratio
Typical 0.96
Retardation time
< 35 ms
Suppression of harmonics
DFT: -50 dB at f = n x f
n
, where n = 2, 3, 4, 5,…
1)
Differential current before fault = 0.0 × I
n
, f
n
= 50 Hz. Injected differential current = 2.0 × set operate value
2)
Includes the delay of the output contact value and f
n
= 50 Hz
Table 56. Stabilized differential protection for two-winding transformers (TR2PTDF) main settings
Parameter
Function
Value (Range)
Step
Restraint mode
TR2PTDF
2.h & 5.h & wav
Waveform
2.h & waveform
5.h & waveform
-
High operate value
TR2PTDF
500...3000 %
10
Low operate value
TR2PTDF
5...50 %
1
Slope section 2
TR2PTDF
10...50 %
1
End section 2
TR2PTDF
100...500 %
1
Start value 2.H
TR2PTDF
7...20 %
1
Start value 5.H
TR2PTDF
10...50 %
1
Operation
TR2PTDF
Off
On
-
Winding 1 type
TR2PTDF
Y
YN
D
Z
ZN
-
Winding 2 type
TR2PTDF
Y
YN
D
Z
ZN
-
Zro A elimination
TR2PTDF
Not eliminated
Winding 1
Winding 2
Winding 1 and 2
-
Transformer Protection and Control
1MRS757846 A
RET620
Product version: 2.0
ABB
37
Содержание RET620
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