Breaker-And-A-Half - ABB RELION RET670 Applications Manual

1MRK 504 163-UUS A
15.1.3.5
Transformer protection RET670 2.2 ANSI
Application manual
A double breaker arrangement requires two function blocks, one for breaker
WA1_QA1 and one for breaker WA2_QA1. No voltage selection is necessary, because
the voltage from busbar 1 VT is connected to V3PB1 on SESRSYN for WA1_QA1
and the voltage from busbar 2 VT is connected toV3PB1 on SESRSYN for
WA2_QA1. The voltage from the line VT is connected to V3PL1 on both function
blocks. The condition of VT fuses shall also be connected as shown in figure 310. The
voltage selection parameter CBConfig is set to No voltage sel. for both function blocks.

Breaker-and-a-half

Figure 312 describes a breaker-and-a-half arrangement with three SESRSYN functions
in the same IED, each of them handling voltage selection for WA1_QA1, TIE_QA1
and WA2_QA1 breakers respectively. The voltage from busbar 1 VT is connected to
V3PB1 on all three function blocks and the voltage from busbar 2 VT is connected to
V3PB2 on all three function blocks. The voltage from line1 VT is connected to V3PL1
on all three function blocks and the voltage from line2 VT is connected to V3PL2 on
all three function blocks. The positions of the disconnectors and VT fuses shall be
connected as shown in Figure 312.
Section 15
Control
M12330-3 v8
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