Impedance Lookup

Starting with version 3, Schneider Electric DMS requires impedance attributes to be included with the export of conductor features. But impedance attributes are typically not populated on features in a GIS. Rather, they are accessed from a lookup table based on characteristics of the conductor. The configuration of impedance lookup is defined in the mapping XML.

The default Minerville mapping XML uses the MMENG_CONDUCTOR_ELEC table from the ArcFM sample engineering analysis tables for impedance lookup. This default lookup is not valid for feeder exports in a production environment, because MMENG_CONDUCTOR_ELEC is intended for secondary circuit analysis. So the default lookup configuration should be regarded as a sample only.

The following mapping XML snippet enables lookup for the impedance property “r” (resistance) for underground conductor features:

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<cimProperty name="cim:ACLineSegment.r"> <Lookup tableName="MMENG_CONDUCTOR_ELEC" keyField="UNDERGROUND,MATERIAL,CONDSIZE,INSULATION" valueField="R_PER1000_UNITS_LENGTH" optional="true"> <constant value="1"/> <sourceField name="ConductorInfo.CONDUCTORMATERIAL" useDomain="false" useAny="true"/> <FixCondSize> <sourceField name="ConductorInfo.CONDUCTORSIZE" useDomain="false" useAny="true"/> </FixCondSize> <sourceField name="ConductorInfo.INSULATIONTYPE" useAny="true"/> </Lookup> </cimProperty>

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<cimProperty name="cim:ACLineSegment.r">
 <Lookup tableName="MMENG_CONDUCTOR_ELEC" keyField="UNDERGROUND,MATERIAL,CONDSIZE,INSULATION" valueField="R_PER1000_UNITS_LENGTH" optional="true">
  <constant value="1"/>
  <sourceField name="ConductorInfo.CONDUCTORMATERIAL" useDomain="false" useAny="true"/>
  <FixCondSize>
   <sourceField name="ConductorInfo.CONDUCTORSIZE" useDomain="false" useAny="true"/>
  </FixCondSize>
  <sourceField name="ConductorInfo.INSULATIONTYPE" useAny="true"/>
 </Lookup>
</cimProperty>

The lookup table is identified as MMENG_CONDUCTOR_ELEC. The key fields in the lookup table are UNDERGROUND, MATERIAL, CONDSIZE, and INSULATION. These keys are matched with the constant 1 and the fields CONDUCTORMATERIAL, CONDUCTORSIZE, and INSULATIONTYPE in the GIS feature to obtain a lookup. The output of the lookup is a resistance value from the R_PER1000_UNITS_LENGTH field in the lookup table. This value is applied to the “r” property in CIM.