Table 80. General current and voltage protection CVGAPC, continued
Function Range or value Accuracy
Start undervoltage, step 1 - 2 (2.0 - 150.0)% of UBase ±0.5% of U
r
at U ≤ U
r
±0.5% of U at U > U
r
Independent time delay, overvoltage at
0.8 x U
set
to 1.2 x U
set
, step 1 - 2
(0.00 - 6000.00) s ±0.2% or ±35 ms whichever is greater
Independent time delay, undervoltage
at 1.2 x U
set
to 0.8 x U
set
, step 1 - 2
(0.00 - 6000.00) s ±0.2% or ±35 ms whichever is greater
Overvoltage:
Start time at 0.8 x U
set
to 1.2 x U
set
Min. = 15 ms
Max. = 30 ms
-
Reset time at 1.2 x U
set
to 0.8 x U
set
Min. = 15 ms
Max. = 30 ms
-
Undervoltage:
Start time at 1.2 x U
set
to 0.8 x U
set
Min. = 15 ms
Max. = 30 ms
-
Reset time at 1.2 x U
set
to 0.8 x U
set
Min. = 15 ms
Max. = 30 ms
-
Overvoltage:
Inverse time characteristics, see table
190
4 curve types See table 190
Undervoltage:
Inverse time characteristics, see table
191
3 curve types See table 191
High and low voltage limit, voltage
dependent operation, step 1 - 2
(1.0 - 200.0)% of UBase ±1.0% of U
r
at U ≤ U
r
±1.0% of U at U > U
r
Directional function Settable: NonDir, forward and
reverse
-
Relay characteristic angle (-180 to +180) degrees ±2.0 degrees
Relay operate angle (1 to 90) degrees ±2.0 degrees
Reset ratio, overcurrent > 95% -
Reset ratio, undercurrent < 105% -
Reset ratio, overvoltage > 95% -
Reset ratio, undervoltage < 105% -
Operate frequency 10-90 Hz -
Overcurrent:
Critical impulse time 10 ms typically at 0 to 2 x I
set
-
Impulse margin time 15 ms typically -
Undercurrent:
Critical impulse time 10 ms typically at 2 x I
set
to 0 -
Impulse margin time 15 ms typically -
Overvoltage:
Critical impulse time 10 ms typically at 0.8 x U
set
to 1.2 x
U
set
-
Generator protection REG670
1MRK 502 074-BEN M
Hitachi Power Grids 99
© Copyright 2017 Hitachi Power Grids. All rights reserved
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