ABB Relion Technical Manual page 8

Table of contents
2
Identification...................................................................................... 63
Function block................................................................................... 64
Signals...............................................................................................64
Basic part for LED indication module......................................................65
Identification...................................................................................... 65
Function block................................................................................... 65
Signals...............................................................................................65
Settings..............................................................................................66
LCD part for HMI function keys control module...................................... 67
Identification...................................................................................... 67
Function block................................................................................... 67
Signals...............................................................................................67
Settings..............................................................................................67
Operation principle..................................................................................68
Local HMI...........................................................................................68
Display..........................................................................................68
LEDs.............................................................................................71
Keypad......................................................................................... 71
LED....................................................................................................73
Functionality................................................................................. 73
Status LEDs..................................................................................73
Indication LEDs............................................................................ 73
Function keys.....................................................................................82
Functionality................................................................................. 82
Operation principle....................................................................... 82
Section 6 Differential protection.......................................................... 85
Transformer differential protection..........................................................85
Functionality ......................................................................................85
Transformer differential protection, three winding T3WPDIF (87T)... 86
Identification................................................................................. 86
Function block.............................................................................. 87
Signals..........................................................................................87
Settings.........................................................................................88
Monitored data..............................................................................90
Operation principle............................................................................ 90
Function calculation principles......................................................91
Fundamental frequency differential currents................................ 92
Differential current alarm.............................................................. 97
Bias current.................................................................................. 98
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