ABB Relion 650 Series Product Manual page 34

Transformer protection RET650
Version 1.1 ANSI
Differential protection
Table 21. Transformer differential protection T2WPDIF, T3WPDIF (87T)
Function
Operating characteristic
Reset ratio
Unrestrained differential current limit
Base sensitivity function
Minimum negative sequence current
Operate angle, negative sequence
Second harmonic blocking
Fifth harmonic blocking
Connection type for each of the windings
Phase displacement between high
voltage winding, W1 and each of the
windings, W2 and W3. Hour notation
Operate time, restrained function
Reset time, restrained function
Operate time, unrestrained function
Reset time, unrestrained function
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M13046-1 v6
Range or value Accuracy
Adaptable ± 1.0% of In for I < In
± 1.0% of In for I > In
>94% -
(1.00-50.00)x IBase on ± 1.0% of set value
high voltage winding
(0.05 - 0.60) x IBase ± 1.0% of In
IBase
(0.02 - 0.20) x ± 1.0% of In
(30.0 - 90.0) degrees ± 1.0 degrees
(5.0-100.0)% of ± 2.0% of In
fundamental
differential current
(5.0-100.0)% of ± 12.0% of In
fundamental
differential current
Wye or delta -
0–11 -
25 ms typically at 0 to -
5 x Ib
25 ms typically at 5 to -
0 x Ib
20 ms typically at 0 to -
5 x Ib
25 ms typically at 5 to -
0 x Ib
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