ANSI08000013-1-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
t1
Comparator
VN > Pickup2
PICKUP
TRIP
TRIP
OR
OR
ANSI08000013 V1 EN
Figure 56: 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 56. 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.
Section 8 1MRK 505 277-UUS C
Voltage protection
142
Technical Manual
To Next Page
Loading...
