ABB REG650 Technical Manual page 276

Section 9
Voltage protection
270
VN Comparator
VN > Pickup1
Time integrator
t1
Comparator
VN > Pickup2
Timer
t2
ANSI08000013 V1 EN
Figure 124: Schematic design of Two step residual overvoltage protection
(ROV2PTOV, 59N)
The design of Two step residual overvoltage protection (ROV2PTOV,
59N) is schematically described in
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.
Phase 1
Pickup
PICKUP
&
Trip
Output
Logic
TRIP
Step 1
Phase 1
Pickup
PICKUP
&
Trip
Output
Logic
TRIP
Step 2
1MRK 502 043-UUS B
PU_ST1
TRST1
PU_ST2
TRST2
PICKUP
OR
TRIP
OR
ANSI08000013-1-en.vsd
Figure 124. VN is a signal included
Technical Manual