ANSI08000013-2-en.vsd
VN PU_ST1
TRST1
PU_ST2
TRST2
PICKUP
TRIP
Comparator
VN > Pickup1
Pickup
&
Trip
Output
Logic
Step 2
Phase 1
Phase 1
Timer
t2
PICKUP
Pickup
&
Trip
Output
Logic
Step 1
Time integrator
or Timer t1
Comparator
VN > Pickup2
PICKUP
TRIP
TRIP
OR
OR
ANSI08000013 V2 EN
Figure 75: Schematic design of Two step residual overvoltage protection
(ROV2PTOV, 59N)
The design of Two step residual overvoltage protection (ROV2PTOV,
59N) is schematically described in Figure 75. VN is a signal included in
the three phase group signal V3P which shall be connected to output AI3P
of the SMAI. If a connection is made to the 4 input GRPx_N (x is equal to
instance number 2 to 12) on the SMAI, VN is this signal else VN is the
vectorial sum of the three inputs GRPx_A to GRPx_C.
1MRK 511 287-UUS A Section 7
Voltage protection
185
Technical manual
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