ABB RELION 670 Series Applications Manual page 8

Table of contents
4.2.2.3 Example 3......................................................................................................................................... 59
4.2.2.4 Examples on how to connect, configure and set CT inputs for most commonly
used CT connections......................................................................................................................63
4.2.2.5 Example on how to connect a wye connected three-phase CT set to the IED...................64
4.2.2.6 Example how to connect delta connected three-phase CT set to the IED......................... 68
4.2.2.7 Example how to connect single-phase CT to the IED..............................................................70
4.2.3 Relationships between setting parameter Base Current, CT rated primary current
and minimum pickup of a protection IED..................................................................................... 72
4.2.4 Setting of voltage channels..............................................................................................................72
4.2.4.1 Example.............................................................................................................................................72
4.2.4.2 Examples how to connect, configure and set VT inputs for most commonly used
VT connections................................................................................................................................ 73
4.2.4.3 Examples on how to connect a three phase-to-ground connected VT to the IED.............73
4.2.4.4 Example on how to connect a phase-to-phase connected VT to the IED............................75
4.2.4.5 Example on how to connect an open delta VT to the IED for high impedance
grounded or ungrounded netwoeks........................................................................................... 77
4.2.4.6 Example how to connect the open delta VT to the IED for low impedance
grounded or solidly grounded power systems.........................................................................79
4.2.4.7 Example on how to connect a neutral point VT to the IED.....................................................82
Section 5 Local HMI.................................................................................................................85
5.1 Display...................................................................................................................................................... 86
5.2 LEDs...........................................................................................................................................................87
5.3 Keypad...................................................................................................................................................... 88
5.4 Local HMI functionality......................................................................................................................... 90
5.4.1 Protection and alarm indication..................................................................................................... 90
5.4.2 Parameter management .................................................................................................................. 91
5.4.3 Front communication........................................................................................................................ 91
Section 6 Differential protection..........................................................................................93
6.1 Busbar differential protection ............................................................................................................ 93
6.1.1 Identification.......................................................................................................................................93
6.1.2 Basic applications..............................................................................................................................94
6.1.2.1 General..............................................................................................................................................94
6.1.2.2 Meshed corner application and T-connection application.....................................................95
6.1.3 Busbar protection applications...................................................................................................... 95
6.1.3.1 General.............................................................................................................................................. 95
6.1.3.2 Distinctive features of busbar protection schemes................................................................96
6.1.3.3 Differential protection...................................................................................................................96
6.1.3.4 Zone selection (CT switching)..................................................................................................... 98
6.1.3.5 Auxiliary contact requirement and evaluation..........................................................................98
6.1.3.6 Minimum contact requirements..................................................................................................98
6.1.3.7 Auxiliary contact evaluation logic................................................................................................98
6.1.3.8 Zone selection features............................................................................................................... 101
2
Application manual