A wire or combination of wires, with consistent electrical characteristics, building a single electrical system, used to carry alternating current between points in the power system. For symmetrical, transposed three phase lines, it is sufficient to use attributes of the line segment, which describe impedances and admittances for the entire length of the segment. Additionally impedances can be computed by using length and associated per length impedances. The BaseVoltage at the two ends of ACLineSegments in a Line shall have the same BaseVoltage.nominalVoltage. However, boundary lines may have slightly different BaseVoltage.nominalVoltages and variation is allowed. Larger voltage difference in general requires use of an equivalent branch. http://langdale.com.au/2005/UML#concrete The parts of the AC power system that are designed to carry current or that are conductively connected through terminals. The parts of a power system that are physical devices, electronic or mechanical. The aggregate flag provides an alternative way of representing an aggregated (equivalent) element. It is applicable in cases when the dedicated classes for equivalent equipment do not have all of the attributes necessary to represent the required level of detail. In case the flag is set to “true” the single instance of equipment represents multiple pieces of equipment that have been modelled together as an aggregate equivalent obtained by a network reduction procedure. Examples would be power transformers or synchronous machines operating in parallel modelled as a single aggregate power transformer or aggregate synchronous machine. The attribute is not used for EquivalentBranch, EquivalentShunt and EquivalentInjection. http://langdale.com.au/2005/UML#attribute Container of this equipment. http://langdale.com.au/2005/UML#ofAggregate http://langdale.com.au/2005/UML#byreference Contained equipment. http://langdale.com.au/2005/UML#aggregateOf A modelling construct to provide a root class for containing equipment. http://langdale.com.au/2005/UML#concrete http://langdale.com.au/2005/UML#shadowextension http://langdale.com.au/2005/UML#nc An aggregated representation of the detailed equipment. http://langdale.com.au/2005/UML#nc http://langdale.com.au/2005/UML#byreference A detailed representation of the aggregated equipment. http://langdale.com.au/2005/UML#nc This is a root class to provide common identification for all classes needing identification and naming attributes. The type of a transformer is derived as follows: [source,python] ---- If PowerTransformer.EquipmentContainer-> EquipmentContainer.@type: xfmerType = DCConverterUnit # see DCConverterUnit else: count = PowerTransformer.count(PowerTransformerEnd) if count == 2: xfmerType = TwoWinding elif count == 3: xfmerType = ThreeWinding else: # Log error ---- Master resource identifier issued by a model authority. The mRID is unique within an exchange context. Global uniqueness is easily achieved by using a UUID, as specified in RFC 4122, for the mRID. The use of UUID is strongly recommended. For CIMXML data files in RDF syntax conforming to IEC 61970-552, the mRID is mapped to rdf:ID or rdf:about attributes that identify CIM object elements. http://langdale.com.au/2005/UML#attribute The name is any free human readable and possibly non unique text naming the object. http://langdale.com.au/2005/UML#attribute An unordered enumeration of phase identifiers. Allows designation of phases for both transmission and distribution equipment, circuits and loads. The enumeration, by itself, does not describe how the phases are connected together or connected to ground. Ground is not explicitly denoted as a phase. Residential and small commercial loads are often served from single-phase, or split-phase, secondary circuits. For the example of s12N, phases 1 and 2 refer to hot wires that are 180 degrees out of phase, while N refers to the neutral wire. Through single-phase transformer connections, these secondary circuits may be served from one or two of the primary phases A, B, and C. For three-phase loads, use the A, B, C phase codes instead of s12N. The integer values are from IEC 61968-9 to support revenue metering applications. http://langdale.com.au/2005/UML#enumeration Phase A. Phases A and B. Phases A, B, and C. Phases A, B, C, and N. Phases A, B, and neutral. Phases A and C. Phases A, C and neutral. Phases A and neutral. Phase B. Phases B and C. Phases B, C, and neutral. Phases B and neutral. Phase C. Phases C and neutral. Neutral phase. Unknown non-neutral phase. Unknown non-neutral phase plus neutral. Two unknown non-neutral phases. Two unknown non-neutral phases plus neutral. No phases specified. Secondary phase 1. Secondary phase 1 and 2. Secondary phases 1, 2, and neutral. Secondary phase 1 and neutral. Secondary phase 2. Secondary phase 2 and neutral. A power system resource (PSR) can be an item of equipment such as a switch, an equipment container containing many individual items of equipment such as a substation, or an organisational entity such as sub-control area. Power system resources can have measurements associated. An AC electrical connection point to a piece of conducting equipment. Terminals are connected at physical connection points called connectivity nodes. http://langdale.com.au/2005/UML#concrete Represents the normal network phasing condition. If the attribute is missing, three phases (ABC) shall be assumed, except for terminals of grounding classes (specializations of EarthFaultCompensator, GroundDisconnector, and Ground) which will be assumed to be N. Therefore, phase code ABCN is explicitly declared when needed, e.g. for star point grounding equipment. The phase code on terminals connecting same ConnectivityNode or same TopologicalNode as well as for equipment between two terminals shall be consistent. http://langdale.com.au/2005/UML#enumeration http://langdale.com.au/2005/UML#attribute The conducting equipment of the terminal. Conducting equipment have terminals that may be connected to other conducting equipment terminals via connectivity nodes or topological nodes. http://langdale.com.au/2005/UML#byreference Conducting equipment have terminals that may be connected to other conducting equipment terminals via connectivity nodes or topological nodes. A type with the value space "true" and "false". http://langdale.com.au/2005/UML#primitive A string consisting of a sequence of characters. The character encoding is UTF-8. The string length is unspecified and unlimited. http://langdale.com.au/2005/UML#primitive This package contains the extensions related to the equivalents. http://langdale.com.au/2005/UML#nc This package contains the extensions defined for the need of Network codes (NC) data exchanges. http://langdale.com.au/2005/UML#nc Content of the base CIM published as IEC 61970-301. Contains the core PowerSystemResource and ConductingEquipment entities shared by all applications plus common collections of those entities. Not all applications require all the Core entities. This package does not depend on any other package except the Domain package, but most of the other packages have associations and generalizations that depend on it. The domain package defines primitive datatypes that are used by classes in other packages. Stereotypes are used to describe the datatypes. The following stereotypes are defined: <<enumeration>> A list of permissible constant values. <<Primitive>> The most basic data types used to compose all other data types. <<CIMDatatype>> A datatype that contains a value attribute, an optional unit of measure and a unit multiplier. The unit and multiplier may be specified as a static variable initialized to the allowed value. <<Compound>> A composite of Primitive, enumeration, CIMDatatype or other Compound classes, as long as the Compound classes do not recurse. For all datatypes both positive and negative values are allowed unless stated otherwise for a particular datatype. Top package for IEC 61970. Top package for IEC TC57 CIM. An extension to the Core and Topology package that models information on the electrical characteristics of Transmission and Distribution networks. This package is used by network applications such as State Estimation, Load Flow and Optimal Power Flow. The package contains the European extensions to canonical CIM model. http://langdale.com.au/2005/UML#european