ABB REG670 Product Manual page 62

Generator protection REG670 2.2 and Injection equipment REX060,
REX061, REX062
Product version: 2.2.1
Table 40. 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 x IdMin to 0,
restrained function
*Operate time at 0 to 10 x Idunre,
unrestrained function
*Reset time at 10 x Idunre to 0,
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.
62
M13046-1 v12
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 502 074-BEN A
r
r
ABB