9.3
Two step residual overvoltage protection
ROV2PTOV
9.3.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Two step residual overvoltage
protection
ROV2PTOV
3U0
TRV V1 EN
59N
9.3.2
Functionality
Residual voltages may occur in the power system during earth faults.
Two step residual overvoltage protection ROV2PTOV function calculates the
residual voltage from the three-phase voltage input transformers or measures it from
a single voltage input transformer fed from an open delta or neutral point voltage
transformer.
ROV2PTOV has two voltage steps, each with inverse or definite time delay.
Reset delay ensures operation for intermittent earth faults.
9.3.3
Function block
IEC06000278-2-en.vsd
ROV2PTOV
U3P*
BLOCK
BLKTR1
BLKST1
BLKTR2
BLKST2
TRIP
TR1
TR2
START
ST1
ST2
IEC06000278 V2 EN
Figure 242:
ROV2PTOV function block
9.3.4
Signals
Table 277:
ROV2PTOV Input signals
Name
Type
Default
Description
U3P
GROUP
SIGNAL
-
Three phase voltages
BLOCK
BOOLEAN
0
Block of function
BLKTR1
BOOLEAN
0
Block of operate signal, step 1
Table continues on next page
1MRK502052-UEN B
Section 9
Voltage protection
505
Technical manual
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