ABB RELION 670 SERIES REG670 - Page 9

Operation principle.......................................................................... 114
Frequency reporting
................................................................... 116
Reporting filters
.......................................................................... 118
Scaling Factors for ANALOGREPORT channels....................... 119
PMU Report Function Blocks Connection Rules in PCM600
Application Configuration Tool (ACT)......................................... 121
Setting guidelines............................................................................ 127
Section 7 Differential protection........................................................ 133
Transformer differential protection T2WPDIF and T3WPDIF (87T)......133
Identification.................................................................................... 133
Application....................................................................................... 133
Setting guidelines............................................................................ 134
Restrained and unrestrained differential protection....................134
Elimination of zero sequence currents....................................... 138
Inrush restraint methods.............................................................138
Overexcitation restraint method..................................................138
Cross-blocking between phases.................................................139
External/Internal fault discriminator............................................ 139
On-line compensation for on-load tap-changer position.............141
Differential current alarm............................................................ 142
Open CT detection..................................................................... 142
Switch onto fault feature............................................................. 143
Setting example...............................................................................143
Introduction.................................................................................143
Typical main CT connections for transformer differential
protection....................................................................................144
Application Examples................................................................. 145
Summary and conclusions......................................................... 153
High impedance differential protection, single phase HZPDIF (87)......155
Identification.................................................................................... 155
Application....................................................................................... 156
The basics of the high impedance principle............................... 158
Connection examples for high impedance differential protection.... 164
Connections for three-phase high impedance differential
protection....................................................................................164
Connections for 1Ph High impedance differential protection
HZPDIF (87)............................................................................... 165
Setting guidelines............................................................................ 166
Configuration.............................................................................. 167
Settings of protection function.................................................... 167
Table of contents
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 3
Application manual