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ABB REG650 Technical Manual page 337

Generator protection

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1MRK 502 043-UUS B

LINE1_OP

LINE1_CL

BUS1_OP

BUS1_CL

LINE2_OP

LINE2_CL

BUS2_OP

BUS2_CL

VB1OK

VB1FF

VB2OK

VB2FF

VL1OK

VL1FF

VL2OK

VL2FF

BLOCK

ANSI05000780 V1 EN

Figure 152:

Simplified logic diagram for the voltage selection function for a bus circuit breaker in a breaker-and-

a-half arrangement

Technical Manual

AND

AND

AND

AND

AND

AND

line2Voltage

bus2Voltage

OR

OR

OR

OR

OR

AND

line1Voltage

OR

AND

AND

AND

Section 12

Control

L1SEL

L2SEL

B2SEL

invalidSelection

lineVoltage

selectedFuseOK

AND

VSELFAIL

AND

en05000780_ansi.vsd

331

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