4.2.2.7 Example how to connect single-phase CT to the IED.......................................................64
4.2.3 Relationships between setting parameter Base Current, CT rated primary
current and minimum pickup of a protection IED................................................................ 65
4.2.4 Setting of voltage channels.......................................................................................................66
4.2.4.1 Example......................................................................................................................................66
4.2.4.2 Examples how to connect, configure and set VT inputs for most commonly
used VT connections............................................................................................................... 66
4.2.4.3 Examples on how to connect a three phase-to-earth connected VT to the IED......... 67
4.2.4.4 Example on how to connect a phase-to-phase connected VT to the IED.....................69
4.2.4.5 Example on how to connect an open delta VT to the IED for high impedance
earthed or unearthed netwoeks............................................................................................ 71
4.2.4.6 Example how to connect the open delta VT to the IED for low impedance
earthed or solidly earthed power systems..........................................................................72
4.2.4.7 Example on how to connect a neutral point VT to the IED.............................................. 74
Section 5 Local HMI............................................................................................................77
5.1 Display................................................................................................................................................78
5.2 LEDs.................................................................................................................................................... 79
5.3 Keypad............................................................................................................................................... 80
5.4 Local HMI functionality................................................................................................................... 82
5.4.1 Protection and alarm indication...............................................................................................82
5.4.2 Parameter management ........................................................................................................... 83
5.4.3 Front communication................................................................................................................. 83
Section 6 Differential protection.....................................................................................85
6.1 High impedance differential protection, single phase HZPDIF .............................................85
6.1.1 Identification................................................................................................................................85
6.1.2 Application....................................................................................................................................85
6.1.2.1 The basics of the high impedance principle....................................................................... 87
6.1.3 Connection examples for high impedance differential protection...................................92
6.1.3.1 Connections for three-phase high impedance differential protection.........................92
6.1.3.2 Connections for 1Ph High impedance differential protection HZPDIF.........................93
6.1.4 Setting guidelines....................................................................................................................... 94
6.1.4.1 Configuration............................................................................................................................94
6.1.4.2 Settings of protection function............................................................................................ 94
6.1.4.3 T-feeder protection................................................................................................................. 94
6.1.4.4 Tertiary reactor protection.................................................................................................... 97
6.1.4.5 Alarm level operation.............................................................................................................. 99
Section 7 Current protection..........................................................................................101
7.1 Instantaneous phase overcurrent protection PHPIOC .......................................................... 101
7.1.1 Identification.............................................................................................................................. 101
7.1.2 Application.................................................................................................................................. 101
7.1.3 Setting guidelines......................................................................................................................101
7.1.3.1 Meshed network without parallel line................................................................................ 102
7.1.3.2 Meshed network with parallel line...................................................................................... 104
7.2 Four step phase overcurrent protection OC4PTOC............................................................... 105
7.2.1 Identification..............................................................................................................................105
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