ABB RELION 650 Series Applications Manual page 8

Table of contents
4.2.4.1 Example......................................................................................................................................43
4.2.4.2 Examples how to connect, configure and set VT inputs for most commonly
used VT connections............................................................................................................... 43
4.2.4.3 Examples on how to connect a three phase-to-earth connected VT to the IED......... 44
4.2.4.4 Example on how to connect a phase-to-phase connected VT to the IED.....................46
4.2.4.5 Example on how to connect an open delta VT to the IED for high impedance
earthed or unearthed netwoeks........................................................................................... 48
4.2.4.6 Example how to connect the open delta VT to the IED for low impedance
earthed or solidly earthed power systems......................................................................... 49
4.2.4.7 Example on how to connect a neutral point VT to the IED...............................................51
Section 5 Local HMI........................................................................................................... 55
5.1 Display................................................................................................................................................56
5.2 LEDs.................................................................................................................................................... 57
5.3 Keypad............................................................................................................................................... 58
5.4 Local HMI functionality...................................................................................................................60
5.4.1 Protection and alarm indication.............................................................................................. 60
5.4.2 Parameter management ........................................................................................................... 61
5.4.3 Front communication................................................................................................................. 61
Section 6 Differential protection.....................................................................................63
6.1 Transformer differential protection T3WPDIF ..........................................................................63
6.1.1 Application....................................................................................................................................63
6.1.2 Setting guidelines....................................................................................................................... 64
6.1.2.1 Restrained and unrestrained differential protection....................................................... 64
6.1.2.2 Elimination of zero sequence currents................................................................................66
6.1.2.3 Inrush restraint methods........................................................................................................67
6.1.2.4 Overexcitation restraint method.......................................................................................... 67
6.1.2.5 Cross-blocking between phases........................................................................................... 67
6.1.2.6 External/Internal fault discriminator...................................................................................68
6.1.2.7 Differential current alarm.......................................................................................................69
6.1.2.8 Open CT detection...................................................................................................................69
6.1.2.9 Switch onto fault feature........................................................................................................70
6.1.3 Setting example...........................................................................................................................70
6.1.3.1 Introduction.............................................................................................................................. 70
6.1.3.2 Typical main CT connections for transformer differential protection.......................... 71
6.1.3.3 Application Examples.............................................................................................................. 72
6.1.3.4 Summary and conclusions......................................................................................................76
6.2 Low impedance restricted earth fault protection REFPDIF ................................................... 78
6.2.1 Identification................................................................................................................................ 78
6.2.2 Application.................................................................................................................................... 78
6.2.2.1 Transformer winding, solidly earthed..................................................................................79
6.2.2.2 Transformer winding, earthed through zig-zag earthing transformer........................ 80
6.2.2.3 Autotransformer winding, solidly earthed.......................................................................... 81
6.2.2.4 Reactor winding, solidly earthed.......................................................................................... 82
6.2.2.5 CT earthing direction.............................................................................................................. 83
6.2.3 Setting guidelines....................................................................................................................... 83
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Application manual