Interlocking For Transformer Bay Ab_Trafo (3); Application; Signals From Bus-Coupler - ABB Relion 670 Series Applications Manual

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1MRK 511 358-UUS A

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 134. 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.

ANSI04000515 V1 EN-US

Figure 134: Switchyard layout AB_TRAFO (3)

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

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-

Application manual

252 and 489G are not

used in this interlocking

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Relion rec670