ABB RER620 Technical Manual page 21

1MAC309294-MB F
RER620
Technical Manual
IDMT curves for undervoltage protection ........................................ 541
Standard inverse-time characteristics for
undervoltage protection ............................................................. 542
User-programmable inverse-time characteristics for
undervoltage protection ............................................................. 544
IDMT curve saturation of undervoltage protection ..................... 545
Measurement modes............................................................................ 545
Section 11 Requirements for measurement transformers.................. 549
Current transformers ............................................................................ 549
Current transformer requirements for non-directional
overcurrent protection ..................................................................... 549
Current transformer accuracy class and accuracy limit factor ... 549
Non-directional overcurrent protection ....................................... 550
Example for non-directional overcurrent protection ................... 551
Section 12 Relay physical connections .............................................. 553
Protective ground connections ............................................................. 553
Communication connections ................................................................ 553
Ethernet RJ-45 front connection ..................................................... 554
Ethernet rear connections ............................................................... 554
EIA-232 serial rear connection........................................................ 554
EIA-485 serial rear connection........................................................ 555
Optical ST serial rear connection .................................................... 555
Communication interfaces and protocols ........................................ 555
Rear communication modules......................................................... 556
COMB022/23A jumper locations and connections .................... 557
Section 13 Technical data .................................................................. 563
Section 14 Relay and functionality tests............................................. 569
Section 15 Applicable standards and regulations .............................. 571
Section 16 Glossary ........................................................................... 573
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