4.2.2.5 Example on how to connect a star connected three-phase CT set to the IED............ 67
4.2.2.6 Example how to connect delta connected three-phase CT set to the IED...................70
4.2.2.7 Example how to connect single-phase CT to the IED....................................................... 72
4.2.3 Relationships between setting parameter Base Current, CT rated primary
current and minimum pickup of a protection IED................................................................ 73
4.2.4 Setting of voltage channels.......................................................................................................74
4.2.4.1 Example......................................................................................................................................74
4.2.4.2 Examples how to connect, configure and set VT inputs for most commonly
used VT connections............................................................................................................... 74
4.2.4.3 Examples on how to connect a three phase-to-earth connected VT to the IED..........75
4.2.4.4 Example on how to connect a phase-to-phase connected VT to the IED..................... 77
4.2.4.5 Example on how to connect an open delta VT to the IED for high impedance
earthed or unearthed networks............................................................................................ 79
4.2.4.6 Example how to connect the open delta VT to the IED for low impedance
earthed or solidly earthed power systems......................................................................... 80
Section 5 Local HMI............................................................................................................83
5.1 Display................................................................................................................................................84
5.2 LEDs....................................................................................................................................................85
5.3 Keypad............................................................................................................................................... 86
5.4 Local HMI functionality...................................................................................................................88
5.4.1 Protection and alarm indication...............................................................................................88
5.4.2 Parameter management ...........................................................................................................89
5.4.3 Front communication.................................................................................................................89
Section 6 Differential protection.....................................................................................91
6.1 Busbar differential protection ......................................................................................................91
6.1.1 Identification................................................................................................................................ 91
6.1.2 Basic applications....................................................................................................................... 92
6.1.2.1 General........................................................................................................................................92
6.1.2.2 Meshed corner application and T-connection application.............................................. 92
6.1.3 Busbar protection applications................................................................................................93
6.1.3.1 General....................................................................................................................................... 93
6.1.3.2 Differential protection............................................................................................................ 93
6.1.3.3 Check zone protection............................................................................................................ 96
6.1.3.4 Switch status monitoring.......................................................................................................97
6.1.3.5 CT connection control........................................................................................................... 101
6.1.3.6 CT disconnection for bus interconnector CT cores........................................................ 102
6.1.3.7 End fault protection.............................................................................................................. 105
6.1.3.8 Zone interconnection (Load transfer)............................................................................... 108
6.1.3.9 Tripping arrangements.........................................................................................................109
6.1.3.10 Mechanical lock-out function................................................................................................111
6.1.3.11 Contact reinforcement with heavy duty relays.................................................................112
6.1.3.12 Trip circuit supervision.......................................................................................................... 112
6.1.4 Two-zone busbar arrangements.............................................................................................112
6.1.4.1 General...................................................................................................................................... 112
6.1.4.2 Single busbar arrangements................................................................................................ 112
Table of contents
2 Busbar protection REB670
Application manual
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