ABB Relion 670 Series Product Manual page 70

Generator protection REG670
Version 2.2
Differential protection
Table 40. Generator differential protection GENPDIF
Function
Unrestrained differential current limit
Reset ratio
Minimum pickup
Negative sequence current level
Operate time at 0 to 2 x IdMin
restrained function
Reset time at 2 x IdMin to 0
restrained function
Operate time at 0 to 5 x IdUnre
unrestrained function
Reset time at 5 x IdUnre to 0
unrestrained function
Critical impulse time, unrestrained
function
Impulse margin time unrestrained
function
Operate time at 0 to 5 x IMinNegSeq
Negative sequence unrestrained
function
Reset time at 5 x IMinNegSeq to 0
Negative sequence unrestrained
function
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SEMOD175004-2 v10
Range or value
IBase
(1-50)p.u. of
> 95%
(0.05–1.00)p.u. of IBase
IBase
(0.02–0.20)p.u. of
Min. = 25 ms
Max. = 35 ms
Min. = 10 ms
Max. = 25 ms
Min. = 5 ms
Max. = 15 ms
Min. = 15 ms
Max. = 30 ms
2 ms typically at 0 to 5 x IdUnre
10 ms typically
Min. = 25 ms
Max. = 35 ms
Min. = 30 ms
Max. = 45 ms
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Accuracy
±1.0% of set value
-
±1.0% of I
r
±1.0% of I
r
-
-
-
-
-
-
-
-
1MRK 502 074-BEN M
Hitachi Power Grids