ABB Relion 670 series - Two step overvoltage protection OV2 PTOV (59); Introduction; Principle of operation

Function Range or value Accuracy
Definite time delay, step 1 (0.00 - 6000.00) s ± 0.5% ± 10 ms
Definite time delays (0.000-60.000) s ± 0.5% ±10 ms
Minimum operate time,
inverse characteristics
(0.000–60.000) s ± 0.5% ± 10 ms
Operate time, pickup
function
25 ms typically at 2 x V
set
to 0 0 -
Reset time, pickup
function
-
Critical impulse time 10 ms typically at 2 x V
set
to 0 -
Impulse margin time 15 ms typically -
8.2 Two step overvoltage protection OV2PTOV (59)
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
8.2.1 Introduction
Overvoltages may occur in the power system during abnormal conditions such as
sudden power loss, tap changer regulating failures, open line ends on long lines etc.
Two step overvoltage protection (OV2PTOV, 59) 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 (59) has two voltage steps, each of them with inverse or definite time delayed.
OV2PTOV (59) has an extremely high reset ratio to allow settings close to system
service voltage.
8.2.2 Principle of operation
Two step overvoltage protection OV2PTOV (59) is used to detect high power system
voltage. OV2PTOV (59) has two steps with separate time delays. If one-, two- or three-
1MRK505222-UUS C Section 8
Voltage protection
505
Technical reference manual