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ABB Relion 670 Series Technical Reference Manual page 630

Line differential protection ansi

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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

ANSI05000780 V1 EN

Figure 312:

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

a-half arrangement

624

AND

AND

AND

AND

AND

AND

line2Voltage

bus2Voltage

OR

OR

OR

OR

OR

AND

line1Voltage

OR

AND

AND

AND

1MRK505222-UUS C

L1SEL

L2SEL

B2SEL

invalidSelection

lineVoltage

selectedFuseOK

AND

VSELFAIL

AND

en05000780_ansi.vsd

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