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ABB RED650 Technical Manual page 325

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1MRK 505 394-UEN A

LN1QOPEN

LN1QCLD

B1QOPEN

B1QCLD

LN2QOPEN

LN2QCLD

B2QOPEN

B2QCLD

UB1OK

UB1FF

UB2OK

UB2FF

ULN1OK

ULN1FF

ULN2OK

ULN2FF

BLOCK

IEC05000781 V2 EN-US

Figure 150:

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

breaker arrangement.

Line differential protection RED650 2.2 IEC

Technical manual

AND

AND

AND

AND

AND

AND

OR

OR

OR

OR

1

AND

line1Voltage

bus1Voltage

1

AND

line2Voltage

bus2Voltage

AND

OR

AND

AND

AND

Section 12

Control

LN1SEL

B1SEL

busVoltage

LN2SEL

B2SEL

invalidSelection

OR

lineVoltage

selectedFuseOK

AND

USELFAIL

AND

en05000781-2.vsd

319

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