ABB Relion 670 Series Applications Manual page 364

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Interlocking for breaker-and-a-half diameter BH (3)

The interlocking for breaker-and-a-half diameter (BH_CONN(3), BH_LINE_A(3), BH_LINE_B(3))

functions are used for lines connected to a breaker-and-a-half diameter according to figure 173.

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Figure 173: Switchyard layout breaker-and-a-half

Three types of interlocking modules per diameter are defined. BH_LINE_A (3) and BH_LINE_B (3)

are the connections from a line to a busbar. BH_CONN (3) is the connection between the two lines

of the diameter in the breaker-and-a-half switchyard layout.

For a breaker-and-a-half arrangement, the modules BH_LINE_A, BH_CONN and BH_LINE_B must be

Configuration setting

For application without 989 and 989G, just set the appropriate inputs to open state and disregard

the outputs. In the functional block diagram, 0 and 1 are designated 0=FALSE and 1=TRUE:

1MRK 511 401-UUS F

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Bay control REC670

Application manual

IP14173-1 v3