ABB Relion 650 Series Product Manual page 57

Transformer protection RET650
Version 2.2
Table 35. Four step directional negative phase sequence overcurrent protection NS4PTOC
Function
Operate current, step 1 - 4
Reset ratio
Independent time delay at 0 to 2 x I
step 1 - 4
Minimum operate time for inverse curves,
step 1 - 4
Inverse time characteristics, see table
145, table 146 and table 147
Minimum operate current, step 1 - 4
Relay characteristic angle (RCA)
Operate current for directional release
Minimum polarizing voltage
Operate time, start non-directional at 0 to
2 x I
set
Reset time, start non-directional at 2 x I
to 0
Operate time, start non-directional at 0 to
10 x I
set
Reset time, start non-directional at 10 x
I to 0
set
Critical impulse time
Impulse margin time
Transient overreach
Hitachi Power Grids
GUID-E83AD807-8FE0-4244-A50E-86B9AF92469E v7
Range or value
(1-2500)% of lBase
> 95% at (10-2500)% of IBase
, (0.000-60.000) s
set
(0.000 - 60.000) s
16 curve types
(1.00 - 10000.00)% of IBase
(-180 to 180) degrees
(1–100)% of IBase
(1–100)% of UBase
Min. = 15 ms
Max. = 30 ms
Min. = 15 ms
set
Max. = 30 ms
Min. = 5 ms
Max. = 20 ms
Min. = 20 ms
Max. = 35 ms
10 ms typically at 0 to 2 x I
15 ms typically
<10% at τ = 100 ms
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Accuracy
at I £ I
±1.0% of I
r r
±1.0% of I at I > I
r
-
±0.2% or ±35 ms whichever is greater
±0.2% or ±35 ms whichever is greater
See table 145, table 146
±1.0% of I at I ≤ I
r r
±1.0% of I at I > I
r
±2.0 degrees
For RCA ±60 degrees:
±2.5% of I at I ≤ I
r r
±2.5% of I at I > I
r
±0.5% of U
r
-
-
-
-
-
set
-
-
1MRK 504 172-BEN G
and table 147
57