ABB REF615 F - 3.7 Fault records; 9.5 Tap changer control with voltage regulator OLATCC

Fast trip in Switch on to fault................................................720
Signals.......................................................................................721
Settings......................................................................................722
Monitored data...........................................................................724
Technical data...........................................................................725
Technical revision history..........................................................726
Tap changer control with voltage regulator OLATCC.....................726
Identification..............................................................................726
Function block...........................................................................726
Functionality..............................................................................726
Operation principle....................................................................727
Voltage and current measurements..........................................728
Tap changer position inputs......................................................729
Operation mode selection..........................................................730
Manual voltage regulation.........................................................731
Automatic voltage regulation of single transformer...................732
Automatic voltage regulation of parallel transformers...............736
Master/Follower principle M/F..............................................737
Negative Reactance Principle NRP......................................739
Minimizing Circulating Current principle MCC......................741
Timer characteristics.................................................................743
Pulse control..............................................................................745
Blocking scheme.......................................................................746
Alarm indication.........................................................................750
Application.................................................................................751
Signals.......................................................................................758
Settings......................................................................................759
Monitored data...........................................................................760
Technical data...........................................................................762
Technical revision history..........................................................763
Section 10 Power quality measurement functions.........................765
Current total demand distortion monitoring CMHAI........................765
Identification..............................................................................765
Function block...........................................................................765
Functionality..............................................................................765
Operation principle....................................................................765
Application.................................................................................766
Signals.......................................................................................767
Settings......................................................................................768
Monitored data...........................................................................768
Voltage total harmonic distortion monitoring VMHAI......................769
Identification..............................................................................769
Function block...........................................................................769
Table of contents
615 series 21
Technical Manual