ABB Relion 670 Series Applications Manual page 22

Table of contents
20.13.2 Setting guidelines.................................................................................................................. 479
20.13.2.1
20.13.2.2
20.13.2.3
Section 21 Requirements..................................................................................................483
21.1 Current transformer requirements........................................................................................... 483
21.1.1 Current transformer basic classification and requirements................................................... 483
21.1.2 Conditions............................................................................................................................. 484
21.1.3 Fault current.......................................................................................................................... 485
21.1.4 Secondary wire resistance and additional load..................................................................... 485
21.1.5 General current transformer requirements............................................................................ 486
21.1.6 Rated equivalent secondary e.m.f. requirements..................................................................486
21.1.6.1
21.1.6.2
21.1.6.3
21.1.6.4
21.1.7 Current transformer requirements for CTs according to other standards.............................. 489
21.1.7.1
21.1.7.2
21.1.7.3
21.2 Voltage transformer requirements........................................................................................... 490
21.3 SNTP server requirements......................................................................................................491
21.4 PTP requirements................................................................................................................... 491
21.5 Sample specification of communication requirements for the protection and control
terminals in digital telecommunication networks..................................................................... 491
21.6 IEC/UCA 61850-9-2LE Merging unit requirements ................................................................ 492
Section 22 Glossary.......................................................................................................... 495
16
System time......................................................................................................................479
Synchronization................................................................................................................479
Process bus IEC/UCA 61850-9-2LE synchronization...................................................... 481
Busbar protection............................................................................................................. 486
Breaker failure protection................................................................................................. 487
Non-directional instantaneous and definitive time, phase and residual overcurrent
protection..........................................................................................................................488
Non-directional inverse time delayed phase and residual overcurrent protection............488
Current transformers according to IEC 61869-2, class P, PR.......................................... 489
Current transformers according to IEC 61869-2, class PX, PXR (and old IEC
60044-6, class TPS and old British Standard, class X)....................................................489
Current transformers according to ANSI/IEEE................................................................. 490
© 2017 - 2021 Hitachi Power Grids. All rights reserved
1MRK 505 370-UUS Rev. K
Busbar protection REB670
Application manual