9.2.2
Functionality OV2PTOV
M13798-3 v15
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, 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 a high reset ratio to allow settings close to system service voltage.
9.2.3
Function block
M13803-3 v6
ANSI06000277-2-en.vsd
OV2PTOV (59)
V3P*
BLOCK
BLKTR1
BLK1
BLKTR2
BLK2
TRIP
TRST1
TRST1_A
TRST1_B
TRST1_C
TRST2
TRST2_A
TRST2_B
TRST2_C
PICKUP
PU_ST1
PU_ST1_A
PU_ST1_B
PU_ST1_C
PU_ST2
PU_ST2_A
PU_ST2_B
PU_ST2_C
ANSI06000277 V2 EN-US
Figure 96:
OV2PTOV (59) function block
9.2.4
Signals
PID-3535-INPUTSIGNALS v7
Table 155:
OV2PTOV (59) Input signals
Name
Type
Default
Description
V3P
GROUP
SIGNAL
-
Group signal for three phase voltage input
BLOCK
BOOLEAN
0
Block of function
BLKTR1
BOOLEAN
0
Block of trip signal, step 1
Table continues on next page
Section 9
1MRK 511 408-UUS A
Voltage protection
286
Phasor measurement unit RES670 2.2 ANSI
Technical manual
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