ABB 1MRK002826-AG - Page 71

M13046-1 v14
Table 41. 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 (10-60)% of IBase ±1.0% of I r
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 10 x IdMin,
restrained function
Min. = 25 ms
Max. = 35 ms
-
*Reset time at 10 x IdMin to 0,
restrained function
Min. = 5 ms
Max. = 15 ms
-
*Operate time at 0 to 10 x Idunre,
unrestrained function
Min. = 5 ms
Max. = 15 ms
-
*Reset time at 10 x Idunre to 0,
unrestrained function
Min. = 15 ms
Max. = 35 ms
-
**Operate time, unrestrained
negative sequence function
Min. = 10 ms
Max. = 20 ms
-
**Reset time, unrestrained negative
sequence function
Min. = 10 ms
Max. = 30 ms
-
Critical impulse time 2 ms typically at 0 to 5 x IdMin -
*Note: Data obtained with single three-phase input current group. The operate and reset times for T2WPDIF/T3WPDIF are valid for an
static output from SOM.
**Note: Data obtained with two three-phase 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.
Generator protection REG670
1MRK 502 074-BEN M
Version 2.2
Hitachi Power Grids 71
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