Two Step Overvoltage Protection Ov2Ptov; Identification; Functionality - ABB RET650 Technical Manual

1MRK 504 135-UEN A
9.2
9.2.1
9.2.2
Technical manual
Function Range or value
Definite time delay, (0.00 - 6000.00) s
step 1
Definite time delays, (0.000-60.000) s
step 2
Minimum operate (0.000–60.000) s
time, inverse
characteristics
Operate time, start 30 ms typically at 1.2 to 0.5U
function
Reset time, start 40 ms typically at 0.5 to 1.2 xU
function
Critical impulse time 10 ms typically at 1.2 to 0.8 x U
Impulse margin time 15 ms typically

Two step overvoltage protection OV2PTOV

Identification

Function description
Two step overvoltage protection

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.
Voltage protection
Accuracy
± 0.5% ± 25 ms
± 0.5% ±25 ms
± 0.5% ± 25 ms
-
set
-
set
-
set
-
IEC 61850 IEC 60617
identification identification
OV2PTOV
3U>
SYMBOL-C-2U-SMALLER-THAN
V2 EN
Section 9
ANSI/IEEE C37.2
device number
59
209