Frequency values...................................................................... 347Setting guidelines...................................................................... 348Test mode functionality TESTMODE..............................................353Application................................................................................. 353IEC 61850 protocol test mode..............................................353Setting guidelines...................................................................... 354Time synchronization TIMESYNCHGEN........................................354Application................................................................................. 354Setting guidelines...................................................................... 355System time..........................................................................355Synchronization....................................................................356Process bus IEC/UCA 61850-9-2LE synchronization.......... 359Section 19 Requirements............................................................... 361Current transformer requirements.................................................. 361Current transformer basic classification and requirements....... 361Conditions..................................................................................363Fault current.............................................................................. 364Secondary wire resistance and additional load......................... 364General current transformer requirements................................ 365Rated equivalent secondary e.m.f. requirements...................... 365Transformer differential protection....................................... 365Distance protection...............................................................366Breaker failure protection..................................................... 368Restricted earth fault protection (low impedancedifferential)............................................................................368Current transformer requirements for CTs according toother standards..........................................................................371Current transformers according to IEC 61869-2,class P, PR...........................................................................371Current transformers according to IEC 61869-2, classPX, PXR (and old IEC 60044-6, class TPSand old British Standard, class X)........................................ 371Current transformers according to ANSI/IEEE..................... 372Voltage transformer requirements.................................................. 372SNTP server requirements............................................................. 373PTP requirements...........................................................................373IEC/UCA 61850-9-2LE Merging unit requirements ....................... 373Section 20 Glossary....................................................................... 375Table of contents12 Transformer protection RET650 2.2 IECApplication manual
