ABB RELION 650 Series Applications Manual page 19

21.1.3 Fault current............................................................................................................................... 356
21.1.4 Secondary wire resistance and additional load.................................................................. 356
21.1.5 General current transformer requirements......................................................................... 357
21.1.6 Rated equivalent secondary e.m.f. requirements............................................................... 357
21.1.6.1 Line differential protection.................................................................................................. 357
21.1.6.2 Distance protection...............................................................................................................358
21.1.6.3 Breaker failure protection....................................................................................................360
21.1.6.4 Restricted earth fault protection (low impedance differential).................................. 360
21.1.7 Current transformer requirements for CTs according to other standards.................. 362
21.1.7.1 Current transformers according to IEC 61869-2, class P, PR........................................ 363
21.1.7.2 Current transformers according to IEC 61869-2, class PX, PXR (and old IEC
60044-6, class TPS and old British Standard, class X)................................................... 363
21.1.7.3 Current transformers according to ANSI/IEEE................................................................363
21.2 Voltage transformer requirements............................................................................................364
21.3 SNTP server requirements........................................................................................................... 364
21.4 Sample specification of communication requirements for the protection and
control terminals in digital telecommunication networks....................................................364
Section 22 Glossary........................................................................................................... 367
Application manual
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