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ABB RELION 670 Series Technical Manual page 769

Generator protection

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1MRK 502 066-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

ANSI05000781 V2 EN-US

Figure 406: Simplified logic diagram for the voltage selection function for the tie circuit breaker in breaker-

and-a-half arrangement.

Technical manual

AND

AND

AND

AND

AND

AND

OR

OR

OR

OR

NOT

AND

line1Voltage

bus1Voltage

NOT

AND

line2Voltage

bus2Voltage

AND

OR

AND

AND

AND

Section 14

Control

L1SEL

B1SEL

busVoltage

L2SEL

B2SEL

invalidSelection

OR

lineVoltage

selectedFuseOK

AND

VSELFAIL

AND

en05000781_2_ansi.vsd

763

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