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ABB REG650 Technical Manual page 338

Generator protection

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Section 12

Control

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 V1 EN

Figure 153:

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

half arrangement.

332

AND

AND

AND

AND

AND

AND

OR

OR

OR

OR

NOT

AND

line1Voltage

bus1Voltage

NOT

AND

line2Voltage

bus2Voltage

AND

OR

AND

AND

AND

1MRK 502 043-UUS B

L1SEL

B1SEL

busVoltage

L2SEL

B2SEL

invalidSelection

OR

lineVoltage

AND

selectedFuseOK

VSELFAIL

AND

en05000781_ansi.vsd

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