ABB Relion 670 Series Applications Manual page 345

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1MRK 511 401-UUS F

Interlocking for transformer bay AB_TRAFO (3)

The interlocking for transformer bay (AB_TRAFO, 3) function is used for a transformer bay

connected to a double busbar arrangement according to figure 145. The function is used when

there is no disconnector between circuit breaker and transformer. Otherwise, the interlocking for

line bay (ABC_LINE, 3) function can be used. This function can also be used in single busbar

arrangements.

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Figure 145: Switchyard layout AB_TRAFO (3)

The signals from other bays connected to the module AB_TRAFO are described below.

Signals from bus-coupler

If the busbar is divided by bus-section disconnectors into bus-sections, the busbar-busbar

connection could exist via the bus-section disconnector and bus-coupler within the other bus-

Bay control REC670

Application manual

252 and 489G are not

used in this interlocking

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