Transformer Differential Protection T2Wpdif, T3Wpdif - ABB RET670 Product Manual

Transformer protection RET670 2.0
Product version: 2.0
Differential protection
Table 23. Transformer differential protection T2WPDIF, T3WPDIF
Function
Operating characteristic
Reset ratio
Unrestrained differential current limit
Minimum pickup
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 at 0 to 10 x IdMin,
restrained function
*Reset time at 10 to 0 x IdMin, restrained
function
*Operate time at 0 to 10 x Idunre,
unrestrained function
*Reset time at 10 to 0 x Idunre,
unrestrained function
**Operate time, unrestrained negative
sequence function
**Reset time, unrestrained negative
sequence function
Critical impulse time
*Note: Data obtained with single input current group.
**Note: Data obtained with two input current groups. The rated symmetrical currents are applied on both sides as pre- and after-fault currents. The
fault is performed by increasing one phase current to double on one side and decreasing same phase current to zero on the other side.
ABB
Range or value
Adaptable
> 90%
IBase on high voltage
(100-5000)% of
winding
(5-60)% of IBase
(5.0-100.0)% of fundamental
differential current
(5.0-100.0)% of fundamental
differential current
Y or D
0–11
Min. = 25 ms
Max. = 35 ms
Min. = 5 ms
Max. = 15 ms
Min. = 5 ms
Max. = 15 ms
Min. = 15 ms
Max. = 30 ms
Min. = 10 ms
Max. = 20 ms
Min. = 10 ms
Max. = 30 ms
2 ms typically at 0 to 5 x IdMin
Accuracy
±1.0% of Ir at I ≤ Ir
±1.0% of I at I > Ir
-
±1.0% of set value
±1.0% of Ir
±1.0% of I
r
Note: fundamental magnitude = 100% of I
±5.0% of I
r
Note: fundamental magnitude = 100% of I
-
-
-
-
-
-
-
-
-
1MRK 504 141-BEN C
r
r
53