ABB RET670 Applications Manual page 596

Section 3
IED application
590
A double breaker arrangement requires two function blocks, SESRSYN1 for breaker
QA1 and SESRSYN2 for breaker QA2. No voltage selection is necessary, because the
voltage from busbar 1 VT is connected to V3PBB1 on SESRSYN1 and the voltage
from busbar 2 VT is connected toV3PBB1 on SESRSYN2. The voltage from the line
VT is connected to V3PLN1 on both SESRSYN1 and SESRSYN2. The condition of
VT fuses shall also be connected as shown in figure 228. The voltage selection
parameter CBConfig is set to No voltage sel. for both SESRSYN1 and SESRSYN2.
Breaker-and-a-half
The line one IED in a breaker-and-a-half arrangement handles voltage selection for
busbar 1 CB and for the tie CB.The IED requires two function blocks, SESRSYN1 for
busbar 1 CB and SESRSYN2 for tie CB. The voltage from busbar 1 VT is connected to
V3PBB1 on both function blocks and the voltage from busbar 2 VT is connected to
V3PBB2 on both function blocks. The voltage from line1 VT is connected to V3PLN1
on both function blocks and the voltage from line2 VT is connected to V3PLN2 on
both function blocks. The positions of the disconnectors and VT fuses shall be
connected as shown in figure 230.
1MRK504116-UUS C
Application manual