ABB RELION 611 Series Technical Manual page 21

611 series
Technical Manual
User-programmable inverse-time characteristics for
undervoltage protection........................................................485
IDMT curve saturation of undervoltage protection............... 486
Frequency measurement and protection........................................486
Measurement modes......................................................................487
Calculated measurements..............................................................489
Section 10 Requirements for measurement transformers..............491
Current transformers...................................................................... 491
Current transformer requirements for overcurrent protection.... 491
Current transformer accuracy class and accuracy limit
factor.................................................................................... 491
Non-directional overcurrent protection................................. 492
Example for non-directional overcurrent protection..............493
Current transformer requirements for differential protection .....494
Section 11 Protection relay's physical connections........................501
Module slot numbering................................................................... 501
Protective earth connections.......................................................... 502
Binary and analog connections...................................................... 502
Communication connections.......................................................... 502
Ethernet RJ-45 front connection................................................503
Ethernet rear connections......................................................... 503
EIA-485 serial rear connection.................................................. 504
Communication interfaces and protocols.................................. 504
Rear communication modules................................................... 505
COM0003 jumper locations and connections.......................506
Recommended third-party industrial Ethernet switches ........... 509
Section 12 Technical data.............................................................. 511
Section 13 Protection relay and functionality tests.........................517
Section 14 Applicable standards and regulations.......................... 521
Section 15 Glossary....................................................................... 523
Table of contents
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