ABB Relion 670 series - Page 123

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Table 103. Negative sequence overcurrent protection LCNSPTOC
Function Range or value Accuracy
Operate value, negative sequence
overcurrent
(3 - 2500)% of IBase ±1.0% of Ir at I ≤ I
r
±1.0% of I at I > I
r
Reset ratio, negative sequence
overcurrent
>95% at (50–2500)% of IBase -
Operate time, start at 0 to 2 x I
set
Min. = 15 ms
Max. = 25 ms
-
Reset time, start at 2 x I
set
to 0 Min. = 15 ms
Max. = 25 ms
-
Operate time, start at 0 to 10 x I
set
Min. = 10 ms
Max. = 20 ms
-
Reset time, start at 10 x I
set
to 0 Min. = 20 ms
Max. = 35 ms
-
Critical impulse time, negative sequence
overcurrent
10 ms typically at 0 to 2 x I
set
2 ms typically at 0 to 10 x I
set
-
Impulse margin time, negative sequence
overcurrent
15 ms typically -
Independent time delay at 0 to 2 x I
set
(0.000-60.000) s ±0.2% or ±35 ms, whichever is greater
Transient overreach, start function <10% at τ = 100 ms -
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Table 104. Zero sequence overcurrent protection LCZSPTOC
Function Range or value Accuracy
Operate value, zero sequence
overcurrent
(3-2500)% of IBase ±1.0% of I
r
at I≤I
r
±1.0% of I at I>I
r
Reset ratio, zero sequence overcurrent >95% at (50–2500)% of IBase -
Operate time, start at 0 to 2 x I
set
Min. = 15 ms
Max. = 30 ms
-
Reset time, start at 2 x I
set
to 0 Min. = 15 ms
Max. = 30 ms
-
Operate time, start at 0 to 10 x I
set
Min. = 10 ms
Max. = 20 ms
-
Reset time, start at 10 x I
set
to 0 Min. = 20 ms
Max. = 35 ms
-
Critical impulse time, zero sequence
overcurrent
10 ms typically at 0 to 2 x I
set
2 ms typically at 0 to 10 x I
set
-
Impulse margin time, zero sequence
overcurrent
15 ms typically -
Independent time delay at 0 to 2 x I
set
(0.000-60.000) s ±0.2% or ±35 ms whichever is greater
Line differential protection RED670
1MRK 505 379-BEN N
Version 2.2
Hitachi Power Grids 123
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