ABB ret650, Technical Manual

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Function Range or value Accuracy
Definite time delay,
step 1
(0.00 - 6000.00) s ± 0.5% ± 25 ms
Definite time delays,
step 2
(0.000-60.000) s ± 0.5% ±25 ms
Minimum operate
time, inverse
characteristics
(0.000–60.000) s ± 0.5% ± 25 ms
Operate time, start
function
30 ms typically at 1.2 to 0.5U
set
-
Reset time, start
function
40 ms typically at 0.5 to 1.2 xU
set
-
Critical impulse time 10 ms typically at 1.2 to 0.8 x U
set
-
Impulse margin time 15 ms typically -
9.2 Two step overvoltage protection OV2PTOV
9.2.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Two step overvoltage protection OV2PTOV
3U>
SYMBOL-C-2U-SMALLER-THAN
V2 EN
59
9.2.2 Functionality
Overvoltages may occur in the power system during abnormal conditions such as
sudden power loss, tap changer regulating failures, and open line ends on long lines.
Two step overvoltage protection (OV2PTOV) function can be used to detect open line
ends, normally then combined with a directional reactive over-power function to
supervise the system voltage. When triggered, the function will cause an alarm, switch
in reactors, or switch out capacitor banks.
OV2PTOV has two voltage steps, where step 1 can be set as inverse or definite time
delayed. Step 2 is always definite time delayed.
OV2PTOV has a high reset ratio to allow settings close to system service voltage.
1MRK 504 135-UEN A
Section 9
Voltage protection
209
Technical manual