TransformerprotectionTransformerLineLineSetting of current input:Set parameterCT_WyePoint withTransformer asreference object.Correct setting is"ToObject"ForwardReverseDefinition of directionfor directional functionsLine protectionIsIsIp Ip IpIED IEDSetting of current input:Set parameterCT_WyePoint withTransformer asreference object.Correct setting is"ToObject"Setting of current input:Set parameterCT_WyePoint withLine asreference object.Correct setting is"FromObject"ANSI05000753.vsdANSI05000753 V2 EN-USFigure 6: Example how to set CT_WyePoint parameters in the IEDThe figure 6 shows the normal case where the objects have their own CTs. The settings for CTdirection shall be done according to the figure. To protect the line the direction of the directionalfunctions of the line protection shall be set toForward. This means that the protection is lookingtowards the line.4.2.2.2 Example 2 SEMOD55055-29 v5Two IEDs used for protection of two objects and sharing a CT.Figure 7: Example how to set CT_WyePoint parameters in the IEDThis example is similar to example 1, but here the transformer is feeding just one line and the lineprotection uses the same CT as the transformer protection does. The CT direction is set withdifferent reference objects for the two IEDs though it is the same current from the same CT that isfeeding the two IEDs. With these settings the directional functions of the line protection shall beset toForward to look towards the line.4.2.2.3 Example 3 SEMOD55055-35 v5One IED used to protect two objects.1MRK 511 364-UUS A Section 4Analog inputs43Application manual
