ABB Relion 670 Series Product Manual page 79

Generator protection REG670
Version 2.2
Table 54. Directional phase overcurrent protection, four steps OC4PTOC
Function
Operate current, step 1-4
Reset ratio
Minimum operate current, step 1-4
Relay characteristic angle (RCA)
Relay operating angle (ROA)
Second harmonic blocking
Independent time delay at 0 to 2 x
I , step 1-4
set
Minimum operate time for inverse
curves , step 1-4
Inverse time characteristics, see
table 182, table 183 and table
Operate time, start non-directional
at 0 to 2 x I
set
Reset time, start non-directional at 2
x I to 0
set
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
Operate frequency, directional
overcurrent
Operate frequency, non-directional
overcurrent
Hitachi Power Grids
Range or value
lBase
(5-2500)% of
> 95% at (50–2500)% of
(1-10000)% of lBase
(40.0–65.0) degrees
(40.0–89.0) degrees
(5–100)% of fundamental
(0.000-60.000) s
(0.000-60.000) s
16 curve types
184
Min. = 15 ms
Max. = 30 ms
Min. = 15 ms
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
38-83 Hz
10-90 Hz
© Copyright 2017 Hitachi Power Grids. All rights reserved
M12342-1 v22
Accuracy
±1.0% of I at I ≤ I
r
±1.0% of I at I > I
lBase
-
±1.0% of I at I ≤ I
r
±1.0% of I at I > I
±2.0 degrees
±2.0 degrees
±2.0% of I
r
±0.2% or ±35 ms whichever is greater
±0.2% or ±35 ms whichever is greater
See table 182, table
-
-
-
-
-
set
-
-
-
1MRK 502 074-BEN M
r
r
r
r
183 and table 184
79