ABB Relion 670 Series Applications Manual page 279

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1MRK 505 370-UUS Rev. K

Breaker-and-a-half

each of them handling voltage selection for WA1_QA1, TIE_QA1 and WA2_QA1 breakers respectively.

The voltage from busbar 1 VT is connected to V3PB1 on all three function blocks and the voltage from

busbar 2 VT is connected to V3PB2 on all three function blocks. The voltage from line1 VT is connected

to V3PL1 on all three function blocks and the voltage from line2 VT is connected to V3PL2 on all three

function blocks. The positions of the disconnectors and VT fuses shall be connected as shown in Figure

Busbar protection REB670

Application manual

describes a breaker-and-a-half arrangement with three SESRSYN functions in the same IED,

Relion reb670