Section 2 Application2.1 General IED applicationThe Intelligent Electronic Device (IED) is used for the protection, control and monitoringof overhead lines and cables in solidly, impedance earthed or isolated networks. The IEDcan be used up to the high voltage levels. It is suitable for the protection of heavily loadedlines and multi-terminal lines where the requirement for tripping is one-, two- and/orthree-phase. The IED is also suitable as back-up protection of power transformers,reactors and so on.Distance protection with quadrilateral or mho characteristics is available. The full schemedistance protection provides protection of power lines with high sensitivity and lowrequirement on remote end communication. The six zones have fully independentmeasuring and setting which gives high flexibility for all types of lines. Loadencroachment and adaptive reach compensation are included.The modern technical solution offers fast operating time of typically less than one cycle.It co-operates with the synchronism check function with high-speed or delayed reclosing.A high impedance differential protection can be used to protect T-feeders or line reactors.High set instantaneous phase and ground overcurrent, four step directional or non-directional delayed phase and ground overcurrent, ground fault for not direct earthedsystems, thermal overload and two step under and overvoltage protection are examples ofthe available functions allowing the user to fulfill any application requirement.The distance phase and ground fault protection, and the directional ground overcurrentprotection can communicate with remote end in any teleprotection communicationscheme. With the included remote communication, following the IEEE C37.94 standard,up to 192 channels for intertrip and binary signals are available per LDCMcommunication module in the communication between the IEDs.The IED can also be provided with full bay control and interlocking functionalityincluding co-operation with the synchronism check function to allow integration of themain or back-up control.Out of Step function is available to separate power system sections close to electricalcentre at occurring out of step.1MRK 506 369-UUS - Section 2ApplicationLine distance protection REL670 2.2 ANSI 45Application manual
