IEC08000013-3-en.vsd
UN ST1
TR1
ST2
TR2
START
TRIP
Comparator
UN > U1>
Start
&
Trip
Output
Logic
Step 2
Phase 1
Phase 1
Timer
t2
START
Start
&
Trip
Output
Logic
Step 1
Time integrator
or Timer t1
Comparator
UN > U2>
START
TRIP
TRIP
OR
OR
IEC08000013 V3 EN
Figure 137: Schematic design of Two step residual overvoltage protection
(ROV2PTOV)
The design of Two step residual overvoltage protection
(ROV2PTOV) is schematically described in Figure 137. UN is a
signal included in the three phase group signal U3P which shall be
connected to output AI3P of the SMAI. If a connection is made to the
4 input GRPxN (x is equal to instance number 2 to 12) on the SMAI,
UN is this signal else UN is the vectorial sum of the three inputs
GRPxL1 to GRPxL3.
Section 9 1MRK 502 048-UEN A
Voltage protection
274
Technical manual
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