1. Application
The Intelligent Electronic Device (IED) is used for the control,protection and monitoring of different types of bays in power
networks. The IED is especially suitable for applications incontrol systems where the IEC 61850–8–1 Ed 1 or Ed 2station bus features of the IED can be fully utilized. It is used
for station-wide interlocking via GOOSE messages andvertical client-server MMS communication to a local station orremote SCADA operator workplace. This supports thearchitecture with distributed control IEDs in all bays with highdemands on reliability. Redundant communication is obtainedthrough the built-in PRP and HSR features which can be usedin star or ringbus architectures. The IED can be used on allvoltage levels. It is suitable for the control of all apparatusesin any type of switchgear arrangement.The control is performed from remote (SCADA/Station)through the IEC 61850–8–1 Ed1 or Ed2 stationcommunication or from the built-in multi-display local HMI.
Cyber security measures are implemented to secure safeautonomous operation of the protection and control functionseven if simultaneous cyber attacks occur. For all commontypes of switchgear

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arrangements, there are different preconfigurations for control and interlocking. One control IEDcan be used for single bay or multi-bay applications. Thecontrol operation is based on the select-before-executeprinciple to give highest possible security. There are
synchrocheck functions available to assist optimal breakerclosing at the right instance in synchronous as well as
asynchronous networks.A number of protection functions are available for flexibility inuse for different station types and busbar arrangements. Tofulfil the user’s application requirements, the IED features,forexample, up to six instantaneous phase and earth overcurrentfunctions, 4–step directional or non-directional delayed-phaseand earth overcurrent functions, thermal overload andfrequency functions, two instances of 2–step under- andovervoltage functions, autorecloser functions and severaldifferent measuring functions. This, together with the multidisplay local HMI that can show one or more pages perfeeder allows using the IED for protection and control for upto six bays in a substation.
The auto-reclose for single-, two-, and/or three-phase recloseincludes priority circuits for multi-breaker arrangements. It cooperates with the synchrocheck function with high-speed ordelayed reclosing. Several breaker failure functions areavailable to provide a breaker failure function independentfrom the protection IEDs, also for a complete one- and a halfbreaker diameter.Disturbance recording and faultlocator are available to allowindependent post-fault analysis after primary disturbances incase of a failure in the protection system