ABB Relion 670 Series Applications Manual page 326

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Single circuit breaker with double busbar, internal voltage selection

IEC10000095 V4 EN-US

Figure 144: Connection of the SESRSYN function block in a single breaker, double busbar

When internal voltage selection is needed, the voltage transformer circuit connections are

made according to figure 144. The voltage from the busbar 1 VT is connected to U3PBB1 and

the voltage from busbar 2 is connected to U3PBB2. The voltage from the line VT is connected

to U3PLN1. The positions of the disconnectors and VT fuses shall be connected as shown in

figure 144. The voltage selection parameter

Double circuit breaker

IEC10000096 V4 EN-US

Figure 145: Connections of the SESRSYN function block in a double breaker arrangement

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 U3PBB1 on SESRSYN for WA1_QA1 and the voltage from busbar 2 VT is

arrangement with internal voltage selection

CBConfig is set to Double bus .

1MRK 511 401-UEN Rev. K

IEC10000095-6-en.vsd

IEC10000096-6-en.vsd

Bay control REC670

Application manual

Relion rec670