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ABB REG650 Technical Manual page 342

Generator protection

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Section 12

Control

LN1QOPEN

LN1QCLD

B1QOPEN

B1QCLD

LN2QOPEN

LN2QCLD

B2QOPEN

B2QCLD

UB1OK

UB1FF

UB2OK

UB2FF

ULN1OK

ULN1FF

ULN2OK

ULN2FF

BLOCK

IEC05000781 V2 EN

Figure 168:

Simplified logic diagram for the voltage selection function for the tie circuit breaker in 1 1/2 breaker

arrangement.

336

AND

AND

AND

AND

AND

AND

OR

OR

OR

OR

1

AND

line1Voltage

bus1Voltage

1

AND

line2Voltage

bus2Voltage

AND

OR

AND

AND

AND

1MRK 502 048-UEN A

LN1SEL

B1SEL

busVoltage

LN2SEL

B2SEL

invalidSelection

OR

lineVoltage

selectedFuseOK

AND

USELFAIL

AND

en05000781-2.vsd

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