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Transformer protection RET650
Product version: 1.1
Differential protection
Table 21. Transformer differential protection T2WPDIF, T3WPDIF
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
48
Range or value
Accuracy
Adaptable
± 1.0% of Ir for I < Ir
± 1.0% of Ir for I > Ir
>94%
-
(1.00-50.00)xIBase
± 1.0% of set value
on high voltage
winding
(0.05 - 0.60) x
± 1.0% of Ir
IBase
(0.02 - 0.20) x
± 1.0% of Ir
IBase
(30.0 - 90.0)
± 1.0 degrees
degrees
(5.0-100.0)% of
± 2.0% of Ir
fundamental
differential current
(5.0-100.0)% of
± 12.0% of Ir
fundamental
differential current
Y or D
-
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
1MRK 504 127-BEN -
Issued: February 2011
ABB
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