M13046-1 v11
Table 37. Transformer differential protection T2WPDIF, T3WPDIF
Function
Range or value
Accuracy
Operating characteristic
Adaptable
±1.0% of Ir at I ≤ Ir
±1.0% of I at I > Ir
Reset ratio
> 90%
-
Unrestrained differential current limit
(100-5000)% of
IBase on high voltage
winding
±1.0% of set value
Minimum pickup
(5-60)% of IBase
±1.0% of Ir
Second harmonic blocking
(5.0-100.0)% of fundamental
differential current
±1.0% of I
r
Note: fundamental magnitude = 100% of I
r
Fifth harmonic blocking
(5.0-100.0)% of fundamental
differential current
±5.0% of I
r
Note: fundamental magnitude = 100% of I
r
Connection type for each of the
windings
Y or D
-
Phase displacement between high
voltage winding, W1 and each of the
windings, W2 and W3. Hour notation
0–11
-
Operate time at 0 to 2 x Id, restrained
function
Min. = 20 ms
Max. = 30 ms
Reset time at 2 to 0 x Id, restrained
function
Min. = 10 ms
Max. = 25 ms
Operate time at 0 to 5 x Id, unrestrained
function
Min. = 10 ms
Max. = 20 ms
Reset time at 5 to 0 x Id, unrestrained
function
Min. = 15 ms
Max. = 30 ms
Critical impulse time
2 ms typically at 0 to 5 x Id
-
M13062-1 v16
Table 38. Restricted earth-fault protection, low impedance REFPDIF
Function
Range or value
Accuracy
Operating characteristic
Adaptable
±1.0% of I
r
at I ≤ I
r
±1.0% of I at I > I
r
Reset ratio
>95%
-
Minimum pickup, IdMin
(4.0-100.0)% of IBase
±1.0% of I
r
Directional characteristic
Fixed 180 degrees or ±60 to ±90
degrees
±2.0 degrees
Operate time, trip at 0 to 10 x
IdMin
Min. = 15 ms
Max. = 30 ms
-
Reset time, trip at 10 to 0 x IdMin Min. = 15 ms
Max. = 30 ms
-
Second harmonic blocking
60.0% of fundamental (hidden
setting)
±1.0% of I
r
1MRK 502 068-BEN D
Generator protection REG670 2.1 IEC
Product version: 2.1
54
ABB
