• Forward means the direction is into the object.• Reverse means the direction is out from the object.Protected ObjectLine , transformer, etcForwardReverseDefinition of directionfor directional functionsMeasured quantity ispositive when flowingtowards the objecte.g . P , Q , IReverseForwardDefinition of directionfor directional functionse.g . P , Q , IMeasured quantity ispositive when flowingtowards the objectSet parameterCT_ WyePointCorrect Setting is" ToObject"Set parameterCT_ WyePointCorrect Setting is" FromObject"ANSI11000275-1.vsdANSI11000275 V1 ENFigure 2: Internal convention of the directionality in the IEDIf the settings of the primary CT is correct, that is CTStarPoint set as FromObject orToObject according to the plant condition, then a positive quantity always flows towardsthe protected object, and a Forward direction always looks towards the protected object.The settings of the IED is performed in primary values. The ratios of the main CTs andVTs are therefore basic data for the IED. The user has to set the rated secondary andprimary currents and voltages of the CTs and VTs to provide the IED with their ratedratios.The CT and VT ratio and the name on respective channel is done under Main menu/Hardware/Analog modules in the Parameter Settings tool or on the HMI.3.3 Presumptions for technical dataThe technical data stated in this document are only valid under the followingcircumstances:• CT and VT ratios in the IED are set in accordance with the associated main instrumenttransformers. Note that for functions which measure an analogue signal which do notSection 3 1MRK 511 287-UUS AAnalog inputs46Technical manual
