A(H1)B(H2)b(X2)a(X1)A(H1)N(H2)n(X2)a(X1)b) c)A(H1)N(H2)dn(X2)da(X1)d)UPri+ +USeca)en06000591.vsdIEC06000591 V1 EN-USFigure 15: Commonly used markings of VT terminalsWhere:a) is the symbol and terminal marking used in this document. Terminals marked with a square indicatethe primary and secondary winding terminals with the same (positive) polarityb) is the equivalent symbol and terminal marking used by IEC (ANSI) standard for phase-to-earthconnected VTsc) is the equivalent symbol and terminal marking used by IEC (ANSI) standard for open deltaconnected VTsd) is the equivalent symbol and terminal marking used by IEC (ANSI) standard for phase-to-phaseconnected VTsIt shall be noted that depending on national standard and utility practices the rated secondaryvoltage of a VT has typically one of the following values:• 100 V• 110 V• 115 V• 120 V• 230 VThe IED fully supports all of these values and most of them will be shown in the followingexamples.4.2.4.3 Examples on how to connect a three phase-to-earth connected VT to theIED SEMOD55055-87 v8Figure 16 gives an example on how to connect a three phase-to-earth connected VT to the IED.It as well gives overview of required actions by the user in order to make this measurementavailable to the built-in protection and control functions within the IED.For correct terminal designations, see the connection diagrams valid for thedelivered IED.Section 4 1MRK 504 158-UEN AAnalog inputs44Application manual
