ABB REL650 Applications Manual page 24

Table of contents
18
Denial of service................................................................................... 487
Identification.................................................................................... 487
Application....................................................................................... 487
Setting guidelines............................................................................ 487
Section 18 Requirements.................................................................... 489
Current transformer requirements........................................................ 489
Current transformer classification.................................................... 489
Conditions........................................................................................490
Fault current.....................................................................................491
Secondary wire resistance and additional load............................... 491
General current transformer requirements...................................... 492
Rated equivalent secondary e.m.f. requirements............................ 492
Distance protection.....................................................................492
Breaker failure protection........................................................... 493
Non-directional instantaneous and definitive time, phase and
residual overcurrent protection................................................... 494
Non-directional inverse time delayed phase and residual
overcurrent protection.................................................................495
Directional phase and residual overcurrent protection............... 496
Current transformer requirements for CTs according to other
standards.........................................................................................496
Current transformers according to IEC 61869-2, class P, PR.... 496
Current transformers according to IEC 61869-2, class PX,
PXR (and old IEC 60044-6, class TPS
and old British Standard, class X).............................................. 497
Current transformers according to ANSI/IEEE........................... 497
Voltage transformer requirements........................................................ 498
SNTP server requirements................................................................... 499
SNTP server requirements.............................................................. 499
Section 19 Glossary............................................................................ 501
Application manual