IDMT curve saturation of undervoltage protection...............838Frequency measurement and protection........................................838Measurement modes......................................................................839Calculated measurements..............................................................841Section 12 Requirements for measurement transformers..............843Current transformers......................................................................843Current transformer requirements for non-directionalovercurrent protection................................................................843Current transformer accuracy class and accuracy limitfactor....................................................................................843Non-directional overcurrent protection.................................844Example for non-directional overcurrent protection..............845Section 13 IED physical connections.............................................847Protective earth connections..........................................................847Binary and analog connections......................................................847Communication connections..........................................................848Ethernet RJ-45 front connection................................................848Ethernet rear connections.........................................................849EIA-232 serial rear connection..................................................849EIA-485 serial rear connection..................................................849Line differential protection communication connection..............850Optical ST serial rear connection..............................................850Communication interfaces and protocols..................................850Rear communication modules...................................................851COM0001-COM0014 jumper locations and connections.....855COM0023 jumper locations and connections.......................858COM0008 and COM0010 jumper locations andconnections..........................................................................863COM0032-COM0034 jumper locations and connections.....866Recommended third-party industrial Ethernet switches ...........869Section 14 Technical data..............................................................871Section 15 IED and functionality tests............................................877Section 16 Applicable standards and regulations..........................881Section 17 Glossary.......................................................................883Table of contents615 series 23Technical Manual
