Section 3 REF615 variants3.1 REF615 variant listREF615 is intended for protection and control mainly in MV feeder applications. Theproduct has a number of standard configurations covering a wide range of primarycircuit configurations in distribution networks based on different system earthingmethods.Some of the functions included in the IED's standard configurations are optional atthe time of placing the order. The description of standard configurations covers thefull functionality including options, presenting the functionality, flexibility andexternal connections of REF615 with a specific configuration as delivered from thefactory.3.2 Presentation of standard configurationsFunctional diagramsThe functional diagrams describe the IED's functionality from the protection,measuring, condition monitoring, disturbance recording, control and interlockingperspective. Diagrams show the default functionality with simple symbol logicsforming principle diagrams. The external connections to primary devices are alsoshown, stating the default connections to measuring transformers. The positivemeasuring direction of directional protection functions is towards the outgoing feeder.The functional diagrams are divided into sections which each constitute onefunctional entity. The external connections are also divided into sections. Only therelevant connections for a particular functional entity are presented in each section.Protection function blocks are part of the functional diagram. They are identifiedbased on their IEC 61850 name but the IEC based symbol and the ANSI functionnumber are also included. Some function blocks, such as PHHPTOC, are used severaltimes in the configuration. To separate the blocks from each other, the IEC 61850name, IEC symbol and ANSI function number are appended with a running number,that is an instance number, from one upwards. If the block has no suffix after the IECor ANSI symbol, the function block has been used, that is, instantiated, only once.The IED’s internal functionality and the external connections are separated with adashed line presenting the IED’s physical casing.1MRS756378 D Section 3REF615 variantsREF615 27Application Manual
