ABB Relion 670 Series Technical Reference Manual page 511

1MRK505222-UUS C
8.2
8.2.1
8.2.2
Technical reference manual
Function Range or value
Definite time delay, step 1
Definite time delays
Minimum operate time,
inverse characteristics
Operate time, pickup
function
Reset time, pickup
function
Critical impulse time
Impulse margin time
Two step overvoltage protection OV2PTOV (59)
Function description
Two step overvoltage protection
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.
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-
(0.00 - 6000.00) s
(0.000-60.000) s
(0.000–60.000) s
25 ms typically at 2 x V to 0 0
set
10 ms typically at 2 x V to 0
set
15 ms typically
IEC 61850
identification
OV2PTOV
Section 8
Voltage protection
Accuracy
± 0.5% ± 10 ms
± 0.5% ±10 ms
± 0.5% ± 10 ms
-
-
-
-
IEC 60617 ANSI/IEEE C37.2
identification device number
59
3U>
SYMBOL-C-2U-SMALLER-THAN
V2 EN
505