ABB Relion 670 Series Applications Manual page 351

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1MRK 511 401-UUS F

The interlocking for bus-section disconnector (A1A2_DC, 3) function is used for one bus-section

disconnector between section 1 and 2 according to figure 151. A1A2_DC (3) function can be used

for different busbars, which includes a bus-section disconnector.

ANSI04000492 V1 EN-US

Figure 151: Switchyard layout A1A2_DC (3)

The signals from other bays connected to the module A1A2_DC are described below.

Signals in single breaker arrangement

If the busbar is divided by bus-section disconnectors, the condition

connected to the bus-section must be made by a project-specific logic.

The same type of module (A1A2_DC) is used for different busbars, that is, for both bus-section

disconnector A1A2_DC and B1B2_DC. But for B1B2_DC, corresponding signals from busbar B are

ANSI04000493 V1 EN-US

Figure 152: Busbars divided by bus-section disconnectors (circuit breakers)

To derive the signals:

These signals from each line bay (ABC_LINE), each transformer bay (AB_TRAFO), and each bus-

coupler bay (ABC_BC) are needed:

Bay control REC670

Application manual

All disconnectors on bus-section 1 are open.

All disconnectors on bus-section 2 are open.

The switch status of disconnectors on bus-section 1 is valid.

The switch status of disconnectors on bus-section 2 is valid.

No transmission error from any bay that contains the above information.

en04000492_ansi.vsd

en04000493_ansi.vsd

no other disconnector