ABB Relion 670 Series Product Manual page 71

Generator protection REG670
Version 2.2
Table 41. 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 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.
Hitachi Power Grids
M13046-1 v14
Range or value
Adaptable
> 90%
IBase on high
(100-5000)% of
voltage winding
(10-60)% 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. = 35 ms
Min. = 10 ms
Max. = 20 ms
Min. = 10 ms
Max. = 30 ms
2 ms typically at 0 to 5 x IdMin
© Copyright 2017 Hitachi Power Grids. All rights reserved
Accuracy
±1.0% of Ir at I ≤ Ir
±1.0% of I at I > Ir
-
±1.0% of set value
±1.0% of I r
±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 M
r
r
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