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Section 9
Voltage protection
9.2.2
9.2.3
9.2.4
284
Functionality OV2PTOV
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.
Function block
OV2PTOV (59)
V3P*
TRIP
BLOCK
TRST1
BLKTR1
TRST1_A
BLK1
TRST1_B
BLKTR2
TRST1_C
BLK2
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
ANSI06000277-2-en.vsd
ANSI06000277 V2 EN
Figure 93:
OV2PTOV (59) function block
Signals
Table 156:
OV2PTOV (59) Input signals
Name
Type
V3P
GROUP
SIGNAL
BLOCK
BOOLEAN
BLKTR1
BOOLEAN
BLK1
BOOLEAN
BLKTR2
BOOLEAN
BLK2
BOOLEAN
Default
Description
-
Group signal for three phase voltage input
0
Block of function
0
Block of trip signal, step 1
0
Block of step 1
0
Block of trip signal, step 2
0
Block of step 2
Phasor measurement unit RES670 2.1 ANSI
1MRK 511 365-UUS A
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