Two step residual overvoltage protection ROV2PTOV (59N) function calculates the
residual voltage from the three-phase voltage input transformers or measures it from a
single voltage input transformer fed from a broken delta or neutral point voltage
transformer.
ROV2PTOV (59N) has two voltage steps, where step 1 can be set as inverse or definite
time delayed. Step 2 is always definite time delayed.
8.3.3
Function block
ANSI09000273_1_en.vsd
ROV2PTOV (59N)
V3P*
BLOCK
BLK1
BLK2
TRIP
TRST1
TRST2
PICKUP
PU_ST1
PU_ST2
ANSI09000273 V1 EN
Figure 55:
ROV2PTOV (59N) function block
8.3.4
Signals
Table 77:
ROV2PTOV (59N) 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 78:
ROV2PTOV (59N) 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
PU_ST2
BOOLEAN
Start signal from step 2
Section 8
1MRK 505 277-UUS C
Voltage protection
138
Technical Manual
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