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, where step 1 can be set as inverse or definite time
delayed. Step 2 is always definite time delayed.
OV2PTOV (59) has a high reset ratio to allow settings close to system service voltage.
7.2.3 Function block
ANSI09000278-1-en.vsd
OV2PTOV (59)
V3P*
BLOCK
BLK1
BLK2
TRIP
TRST1
TRST2
PICKUP
PU_ST1
PU_ST1_A
PU_ST1_B
PU_ST1_C
PU_ST2
ANSI09000278 V1 EN
Figure 71: OV2PTOV function block (59)
7.2.4 Signals
Table 117: OV2PTOV (59) Input signals
Name
Type Default Description
V3P GROUP
SIGNAL
- Three phase group signal for voltage inputs
BLOCK BOOLEAN 0 Block of function
BLK1 BOOLEAN 0 Block of step 1
BLK2 BOOLEAN 0 Block of step 2
Table 118: OV2PTOV (59) Output signals
Name
Type Description
TRIP BOOLEAN Common trip signal
TRST1 BOOLEAN Trip signal from step 1
TRST2 BOOLEAN Trip signal from step 2
PICKUP BOOLEAN General pickup signal
PU_ST1 BOOLEAN Start signal from step 1
Table continues on next page
Section 7 1MRK 511 287-UUS A
Voltage protection
174
Technical manual
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