ABB REG650 Technical Manual page 8

Table of contents
2
Settings........................................................................................47
Operation principle...........................................................................48
Local HMI....................................................................................48
Display....................................................................................48
LEDs.......................................................................................51
Keypad...................................................................................51
LED..............................................................................................54
Functionality...........................................................................54
Status LEDs...........................................................................54
Indication LEDs......................................................................54
Function keys..............................................................................62
Functionality...........................................................................62
Operation principle.................................................................62
Section 5 Differential protection.....................................................65
Transformer differential protection....................................................65
Functionality ...............................................................................65
Transformer differential protection T3WPDIF .............................66
Identification...........................................................................66
Function block........................................................................66
Signals....................................................................................66
Settings..................................................................................67
Monitored data.......................................................................69
Operation principle......................................................................69
Function calculation principles...............................................70
Fundamental frequency differential currents..........................71
Differential current alarm........................................................76
Bias current............................................................................76
Elimination of zero sequence currents...................................77
Restrained, and unrestrained limits of the differential
protection................................................................................78
Fundamental frequency negative sequence differential
currents..................................................................................80
Internal/external fault discriminator........................................82
Unrestrained, and sensitive negative sequence
protections..............................................................................86
Instantaneous differential currents.........................................88
Harmonic and waveform block criteria...................................88
Switch onto fault feature.........................................................89
Logic diagram.........................................................................90
Technical data.............................................................................95
1Ph High impedance differential protection HZPDIF .......................95
Identification................................................................................95
Introduction..................................................................................96
Technical Manual