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Section 3 IED application 1MRK504089-UEN C QB2OPTR(QB220OTR) (bay 1/sect.B2) ... ... ... QB2OPTR(QB220OTR) (bay n/sect.B2) DCOPTR (B1/B2) VPQB2TR(VQB220TR) (bay 1/sect.B2) ... ... ... VPQB2TR(VQB220TR) (bay n/sect.B2) VPDCTR (B1/B2) EXDU_BB (bay 1/sect.B2) ... ... ... EXDU_BB (bay n/sect.B2) EXDU_DC (B1/B2) & BB_DC_OP & VP_BB_DC & EXDU_BB en04000509.vsd IEC04000509 V1 EN Figure 180: Signals from any bays in section B2 to a busbar earthing switch in the same section For a busbar earthing switch on bypass busbar C, these conditions are valid: QB7OPTR (bay 1) ... ... ... QB7OPTR (bay n) VPQB7TR (bay 1) ... ... ... VPQB7TR (bay n) EXDU_BB (bay 1) ... ... ... EXDU_BB (bay n) & BB_DC_OP & VP_BB_DC & EXDU_BB en04000510.vsd IEC04000510 V1 EN Figure 181: Signals from bypass busbar to busbar earthing switch Signals in double-breaker arrangement The busbar earthing switch is only allowed to operate if all disconnectors of the bus section are open. 440 Application manual
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