Current transformer requirements.................................................. 877
Current transformer basic classification and requirements....... 877
Conditions..................................................................................879
Fault current.............................................................................. 880
Secondary wire resistance and additional load......................... 880
General current transformer requirements................................ 881
Rated equivalent secondary e.m.f. requirements...................... 881
Busbar protection................................................................. 881
Distance protection...............................................................882
Breaker failure protection..................................................... 884
Current transformer requirements for CTs according to
other standards..........................................................................884
Current transformers according to IEC 61869-2,
class P, PR...........................................................................884
Current transformers according to IEC 61869-2, class
PX, PXR (and old IEC 60044-6, class TPS
and old British Standard, class X)........................................ 885
Current transformers according to ANSI/IEEE..................... 885
Voltage transformer requirements.................................................. 886
SNTP server requirements............................................................. 886
PTP requirements...........................................................................887
Sample specification of communication requirements for the
protection and control terminals in digital telecommunication
networks......................................................................................... 887
IEC/UCA 61850-9-2LE Merging unit requirements ....................... 888
Section 26 Glossary....................................................................... 891
Table of contents
Line distance protection REL670 2.2 IEC 25
Application manual
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