CIM Issues » WG13 Issues

Currently, the use of TransformerMeshImpedance and TransformerCoreAdmittance to express transformer impedances in unbalanced network models also requires TransformerEndInfoobjects and, in the most rational approach, also a TransformerTankInfo object. The need for the xxxInfo classes is because some of the required attributes are not defined in the TransformerTankEnd class –they exist only in the TransformerEndInfo class. Interestingly, the information model has a PowerTransformerEnd class (a ‘sibling’ of the TransformerTankEnd class) that has the required attributes.Development of an approach to transformer ‘direct impedance’ modeling for unbalanced models that doesn’t require use of xxxInfo classes would be helpful. The conversation should take place within the larger context of addressing the need to support ‘electric parameter only’ unbalanced grid model data exchange in general. There is a similar issue raised below related to TapChanger and TapChangerInfo.(Note that there is no suggestion that support for ‘device datasheet’ distribution grid modeling is not needed. This just suggests that consideration also needs to be given to the provision of modeling in ‘electric parameter’ terms.)