ABB 1MRK002826-AG - Differential protection

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