Table 154. Stabilized and instantaneous differential protection for two- or three-winding transformers (TR3PTDF) main settings
Parameter Function Value (Range) Step
High operate value TR3PTDF 500...3000 %Ir 10
Low operate value TR3PTDF 5...50 %Ir 1
Slope section 2 TR3PTDF 10...50% 1
End section 2 TR3PTDF 100...500 %Ir 1
Restraint mode TR3PTDF 5 = Waveform
6 = 2.h + waveform
8 = 5.h + waveform
9 = 2.h + 5.h + wav
-
Start value 2.H TR3PTDF 7...20% 1
Start value 5.H TR3PTDF 10...50% 1
Stop value 5.H TR3PTDF 10...50% 1
Slope section 3 TR3PTDF 10...100% 1
Current group 3 type TR3PTDF 1 = Not in use
2 = Winding 3
3 = Wnd 1 restraint
4 = Wnd 2 restraint
-
Zro A elimination TR3PTDF 1 = Not eliminated
2 = Winding 1
3 = Winding 2
4 = Winding 1 and 2
5 = Winding 3
6 = Winding 1 and 3
7 = Winding 2 and 3
8 = Winding 1, 2, 3
-
Phase shift Wnd 1-2 TR3PTDF 0.0...359.9° 0.1
Phase shift Wnd 1-3 TR3PTDF 0.0...359.9° 0.1
Table 155. Stabilized and instantaneous differential protection for two-winding transformers (TR2PTDF)
Characteristic
Value
Operation accuracy Depending on the frequency of the measured current: f
n
±2 Hz
±3.0% of the set value or ±0.002 × I
n
Operate time
1)2)
Minimum Typical Maximum
Low stage
High stage
31 ms
15 ms
35 ms
17 ms
40 ms
20 ms
Reset time <40 ms
Reset ratio Typically 0.96
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5, …
1) Current before fault = 0.0 × I
n
, f
n
= 50 Hz. Injected differential current = 2.0 × set operation value
2) Measured with static power output. f
n
= 50 Hz
1MRS759144 A
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