Single Circuit Breaker With Double Busbar, External Voltage Selection; Single Circuit Breaker With Double Busbar, Internal Voltage Selection - ABB RELION 670 Series Applications Manual

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1MRK 504 152-UEN B

Single circuit breaker with double busbar, external voltage selection

IEC10000094 V4 EN-US

Figure 291: 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 291. 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

IEC10000095 V4 EN-US

Figure 292: 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 292. 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 292. The voltage selection parameter

Application manual

arrangement with external voltage selection

arrangement with internal voltage selection

WA1_MCB / WA2_MCB

WA1_VT / WA2_VT

CBConfig is set to Double bus .

IEC10000094-4-en.vsd

CBConfig is set to No voltage

IEC10000095-6-en.vsd