ABB Relion 670 Series Applications Manual page 325

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1MRK 511 401-UEN Rev. K

Single circuit breaker with single busbar

IEC10000093 V4 EN-US

Figure 142: Connection of SESRSYN function block in a single busbar arrangement

is one voltage transformer on each side of the circuit breaker. The voltage transformer circuit

connections are straightforward; no special voltage selection is necessary.

The voltage from busbar VT is connected to U3PBB1 and the voltage from the line VT is

connected to U3PLN1. The conditions of the VT fuses shall also be connected as shown above.

The voltage selection parameter

Single circuit breaker with double busbar, external voltage selection

IEC10000094 V4 EN-US

Figure 143: Connection of SESRSYN function block in a single breaker, double busbar

In this type of arrangement no internal voltage selection is required. The voltage selection is

made by external relays typically connected according to figure 143. Suitable voltage and VT

fuse failure supervision from the two busbars are selected based on the position of the busbar

disconnectors. This means that the connections to the function block will be the same as for

the single busbar arrangement. The voltage selection parameter

Bay control REC670

Application manual

illustrates connection principles for a single busbar. For the SESRSYN function there

CBConfig is set to No voltage sel .

arrangement with external voltage selection

WA1_MCB / WA2_MCB

WA1_VT / WA2_VT

IEC10000093-4-en.vsd

IEC10000094-4-en.vsd

CBConfig is set to No voltage

M12324-3 v12

Relion rec670