CIM14/CDPSM/Balanced/IEC61968/WiresExt/DistributionLineSegment.py

   1 # Copyright (C) 2010-2011 Richard Lincoln
   2 #
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   4 # of this software and associated documentation files (the "Software"), to
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  14 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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  19 # IN THE SOFTWARE.
  20
  21 from CIM14.CDPSM.Balanced.IEC61970.Wires.ACLineSegment import ACLineSegment
  22
  23 class DistributionLineSegment(ACLineSegment):
  24     """Extends ACLineSegment with references to a library of standard types from which electrical parameters can be calculated, as follows:
 - calculate electrical parameters from asset data, using associated ConductorInfo, with values then multiplied by Conductor.length to produce a matrix model.
 - calculate unbalanced electrical parameters from associated PerLengthPhaseImpedance, then multiplied by Conductor.length to produce a matrix model.
 - calculate transposed electrical parameters from associated PerLengthSequenceImpedance, then multiplied by Conductor.length to produce a sequence model.
 For symmetrical, transposed 3ph lines, it is sufficient to use inherited ACLineSegment attributes, which describe sequence impedances and admittances for the entire length of the segment.
 
 Known issue: Attributes expressing impedances and admittances in PerLengthSequenceImpedance and PhaseImpedanceData use Resistance, etc., which describe pre-calculated, full length of segment, while we should have a longitudinal unit, per length. Taking 'r' as example, its 'unit'=Ohm, but the value is effectively in Ohm/m, so the value needs to be multiplied by Conductor.length. This is against the whole idea of unit data types and is semantically wrong, but base CIM does not have the required data types at this moment. Until the revision of unit modelling in CIM, applications need to deduce and locally handle appending '/m' for units and ensure they multiply the values by Conductor.length.At least one of the Associations must exist.
  25     """
  26
  27     def __init__(self, ConductorInfo=None, SequenceImpedance=None, PhaseImpedance=None, *args, **kw_args):
  28         """Initialises a new 'DistributionLineSegment' instance.
  29
  30         @param ConductorInfo: Conductor data of this conductor segment.
  31         @param SequenceImpedance: Sequence impedance of this conductor segment; used for balanced model.
  32         @param PhaseImpedance: Phase impedance of this conductor segment; used for unbalanced model.
  33         """
  34         self._ConductorInfo = None
  35         self.ConductorInfo = ConductorInfo
  36
  37         self._SequenceImpedance = None
  38         self.SequenceImpedance = SequenceImpedance
  39
  40         self._PhaseImpedance = None
  41         self.PhaseImpedance = PhaseImpedance
  42
  43         super(DistributionLineSegment, self).__init__(*args, **kw_args)
  44
  45     _attrs = []
  46     _attr_types = {}
  47     _defaults = {}
  48     _enums = {}
  49     _refs = ["ConductorInfo", "SequenceImpedance", "PhaseImpedance"]
  50     _many_refs = []
  51
  52     def getConductorInfo(self):
  53         """Conductor data of this conductor segment.
  54         """
  55         return self._ConductorInfo
  56
  57     def setConductorInfo(self, value):
  58         if self._ConductorInfo is not None:
  59             filtered = [x for x in self.ConductorInfo.ConductorSegments if x != self]
  60             self._ConductorInfo._ConductorSegments = filtered
  61
  62         self._ConductorInfo = value
  63         if self._ConductorInfo is not None:
  64             if self not in self._ConductorInfo._ConductorSegments:
  65                 self._ConductorInfo._ConductorSegments.append(self)
  66
  67     ConductorInfo = property(getConductorInfo, setConductorInfo)
  68
  69     def getSequenceImpedance(self):
  70         """Sequence impedance of this conductor segment; used for balanced model.
  71         """
  72         return self._SequenceImpedance
  73
  74     def setSequenceImpedance(self, value):
  75         if self._SequenceImpedance is not None:
  76             filtered = [x for x in self.SequenceImpedance.ConductorSegments if x != self]
  77             self._SequenceImpedance._ConductorSegments = filtered
  78
  79         self._SequenceImpedance = value
  80         if self._SequenceImpedance is not None:
  81             if self not in self._SequenceImpedance._ConductorSegments:
  82                 self._SequenceImpedance._ConductorSegments.append(self)
  83
  84     SequenceImpedance = property(getSequenceImpedance, setSequenceImpedance)
  85
  86     def getPhaseImpedance(self):
  87         """Phase impedance of this conductor segment; used for unbalanced model.
  88         """
  89         return self._PhaseImpedance
  90
  91     def setPhaseImpedance(self, value):
  92         if self._PhaseImpedance is not None:
  93             filtered = [x for x in self.PhaseImpedance.ConductorSegments if x != self]
  94             self._PhaseImpedance._ConductorSegments = filtered
  95
  96         self._PhaseImpedance = value
  97         if self._PhaseImpedance is not None:
  98             if self not in self._PhaseImpedance._ConductorSegments:
  99                 self._PhaseImpedance._ConductorSegments.append(self)
 100
 101     PhaseImpedance = property(getPhaseImpedance, setPhaseImpedance)
 102