ABB RET650 Technical Manual page 8

Table of contents
2
Basic part for LED indication module............................................... 58
Identification................................................................................ 58
Function block............................................................................. 58
Signals.........................................................................................59
Settings........................................................................................60
LCD part for HMI function keys control module................................60
Identification................................................................................ 60
Function block............................................................................. 60
Signals.........................................................................................61
Settings........................................................................................61
Operation principle........................................................................... 62
Local HMI.................................................................................... 62
Display....................................................................................62
LEDs.......................................................................................65
Keypad................................................................................... 65
LED..............................................................................................66
Functionality........................................................................... 66
Status LEDs........................................................................... 67
Indication LEDs...................................................................... 67
Function keys.............................................................................. 75
Functionality........................................................................... 75
Operation principle................................................................. 75
Section 6 Differential protection..................................................... 79
Transformer differential protection....................................................79
Functionality ............................................................................... 79
Transformer differential protection, two winding T2WPDIF ........ 80
Identification........................................................................... 80
Function block........................................................................ 80
Signals....................................................................................80
Settings.................................................................................. 81
Monitored data....................................................................... 83
Transformer differential protection, three winding T3WPDIF ..... 83
Identification........................................................................... 83
Function block........................................................................ 83
Signals....................................................................................84
Settings.................................................................................. 85
Monitored data....................................................................... 86
Operation principle...................................................................... 87
Function calculation principles............................................... 87
Fundamental frequency differential currents.......................... 88
Differential current alarm........................................................ 93
Bias current............................................................................ 93
Elimination of zero sequence currents................................... 93
Technical manual