IdentifiedObject Class

The diagram being exchanged. The coordinate system is a standard Cartesian coordinate system and the orientation attribute defines the orientation. The initial view related attributes can be used to specify an initial view with the x,y coordinates of the diagonal points.

An object that defines one or more points in a given space. This object can be associated with anything that specializes IdentifiedObject. For single line diagrams such objects typically include such items as analog values, breakers, disconnectors, power transformers, and transmission lines.

The diagram style refers to a style used by the originating system for a diagram. A diagram style describes information such as schematic, geographic, etc.

Layers are typically used for grouping diagram objects according to themes and scales. Themes are used to display or hide certain information (e.g., lakes, borders), while scales are used for hiding or displaying information depending on the current zoom level (hide text when it is too small to be read, or when it exceeds the screen size). This is also called de-cluttering. CIM based graphics exchange supports an m:n relationship between diagram objects and layers. The importing system shall convert an m:n case into an appropriate 1:n representation if the importing system does not support m:n.

A reference to a style used by the originating system for a diagram object. A diagram object style describes information such as line thickness, shape such as circle or rectangle etc, and colour.

An electrical connection point (AC or DC) to a piece of conducting equipment. Terminals are connected at physical connection points called connectivity nodes.

Defines a system base voltage which is referenced.

For a detailed substation model a topological node is a set of connectivity nodes that, in the current network state, are connected together through any type of closed switches, including jumpers. Topological nodes change as the current network state changes (i.e., switches, breakers, etc. change state). For a planning model, switch statuses are not used to form topological nodes. Instead they are manually created or deleted in a model builder tool. Topological nodes maintained this way are also called "busses".

Connectivity nodes are points where terminals of AC conducting equipment are connected together with zero impedance.

DC bus.

DC nodes are points where terminals of DC conducting equipment are connected together with zero impedance.

A reporting group is used for various ad-hoc groupings used for reporting.

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.

This class represents the zero sequence line mutual coupling.

A conducting connection point of a power transformer. It corresponds to a physical transformer winding terminal. In earlier CIM versions, the TransformerWinding class served a similar purpose, but this class is more flexible because it associates to terminal but is not a specialization of ConductingEquipment.

Used to define the type of generation for scheduling purposes.

A geographical region of a power system network model.

A subset of a geographical region of a power system network model.

An electrically connected subset of the network. DC topological islands can change as the current network state changes, e.g. due to: - disconnect switches or breakers changing state in a SCADA/EMS. - manual creation, change or deletion of topological nodes in a planning tool. Only energised TopologicalNode-s shall be part of the topological island.

An electrically connected subset of the network. Topological islands can change as the current network state changes, e.g. due to: - disconnect switches or breakers changing state in a SCADA/EMS. - manual creation, change or deletion of topological nodes in a planning tool. Only energised TopologicalNode-s shall be part of the topological island.

Supports connection to a terminal associated with a remote bus from which an input signal of a specific type is coming.

Load whose behaviour is described by reference to a standard model <font color="#0f0f0f">or by definition of a user-defined model.</font> A standard feature of dynamic load behaviour modelling is the ability to associate the same behaviour to multiple energy consumers by means of a single load definition. The load model is always applied to individual bus loads (energy consumers).

Abstract parent class for all Dynamics function blocks.

Resistive and reactive components of compensation for generator associated with IEEE type 2 voltage compensator for current flow out of another generator in the interconnection.

Constant aerodynamic torque model which assumes that the aerodynamic torque is constant. Reference: IEC 61400-27-1:2015, 5.6.1.1.

One-dimensional aerodynamic model. Reference: IEC 61400-27-1:2015, 5.6.1.2.

Two-dimensional aerodynamic model. Reference: IEC 61400-27-1:2015, 5.6.1.3.

Current limitation model. The current limitation model combines the physical limits and the control limits. Reference: IEC 61400-27-1:2015, 5.6.5.8.

Look up table for the purpose of wind standard models.

Pitch angle control model. Reference: IEC 61400-27-1:2015, 5.6.5.2.

P control model type 3. Reference: IEC 61400-27-1:2015, 5.6.5.4.

P control model type 4A. Reference: IEC 61400-27-1:2015, 5.6.5.5.

P control model type 4B. Reference: IEC 61400-27-1:2015, 5.6.5.6.

Q control model. Reference: IEC 61400-27-1:2015, 5.6.5.7.

Constant Q limitation model. Reference: IEC 61400-27-1:2015, 5.6.5.9.

QP and QU limitation model. Reference: IEC 61400-27-1:2015, 5.6.5.10.

Rotor resistance control model. Reference: IEC 61400-27-1:2015, 5.6.5.3.

Frequency and active power controller model. Reference: IEC 61400-27-1:2015, Annex D.

The grid protection model includes protection against over- and under-voltage, and against over- and under-frequency. Reference: IEC 61400-27-1:2015, 5.6.6.

Simplified plant voltage and reactive power control model for use with type 3 and type 4 wind turbine models. Reference: IEC 61400-27-1:2015, Annex D.

Pitch control power model. Reference: IEC 61400-27-1:2015, 5.6.5.1.

Parent class supporting relationships to IEC wind turbines type 3 generator models of IEC type 3A and 3B.

IEC type 4 generator set model. Reference: IEC 61400-27-1:2015, 5.6.3.4.

Two mass model. Reference: IEC 61400-27-1:2015, 5.6.2.1.

Reference frame rotation model. Reference: IEC 61400-27-1:2015, 5.6.3.5.

Aggregate induction motor load. This model is used to represent a fraction of an ordinary load as "induction motor load". It allows a load that is treated as an ordinary constant power in power flow analysis to be represented by an induction motor in dynamic simulation. This model is intended for representation of aggregations of many motors dispersed through a load represented at a high voltage bus but where there is no information on the characteristics of individual motors. Either a "one-cage" or "two-cage" model of the induction machine can be modelled. Magnetic saturation is not modelled. This model treats a fraction of the constant power part of a load as a motor. During initialisation, the initial power drawn by the motor is set equal to <i>Pfrac</i> times the constant <i>P</i> part of the static load. The remainder of the load is left as a static load. The reactive power demand of the motor is calculated during initialisation as a function of voltage at the load bus. This reactive power demand can be less than or greater than the constant <i>Q</i> component of the load. If the motor's reactive demand is greater than the constant <i>Q</i> component of the load, the model inserts a shunt capacitor at the terminal of the motor to bring its reactive demand down to equal the constant <i>Q</i> reactive load. If an induction motor load model and a static load model are both present for a load, the motor <i>Pfrac</i> is assumed to be subtracted from the power flow constant <i>P</i> load before the static load model is applied. The remainder of the load, if any, is then represented by the static load model.

General static load. This model represents the sensitivity of the real and reactive power consumed by the load to the amplitude and frequency of the bus voltage.

A set of limits associated with equipment. Sets of limits might apply to a specific temperature, or season for example. A set of limits may contain different severities of limit levels that would apply to the same equipment. The set may contain limits of different types such as apparent power and current limits or high and low voltage limits that are logically applied together as a set.

Used to apply user standard names to TopologicalNodes. Associated with one or more terminals that are normally connected with the bus name. The associated terminals are normally connected by non-retained switches. For a ring bus station configuration, all BusbarSection terminals in the ring are typically associated. For a breaker and a half scheme, both BusbarSections would normally be associated. For a ring bus, all BusbarSections would normally be associated. For a "straight" busbar configuration, normally only the main terminal at the BusbarSection would be associated.

A value and normal value associated with a specific kind of limit. The sub class value and normalValue attributes vary inversely to the associated OperationalLimitType.acceptableDuration (acceptableDuration for short). If a particular piece of equipment has multiple operational limits of the same kind (apparent power, current, etc.), the limit with the greatest acceptableDuration shall have the smallest limit value and the limit with the smallest acceptableDuration shall have the largest limit value. Note: A large current can only be allowed to flow through a piece of equipment for a short duration without causing damage, but a lesser current can be allowed to flow for a longer duration.

Schedule of values at points in time.

The class is the third level in a hierarchical structure for grouping of loads for the purpose of load flow load scaling.

Defines the structure (in terms of location and direction) of the net interchange constraint for a control area. This constraint may be used by either AGC or power flow.

A control area generating unit. This class is needed so that alternate control area definitions may include the same generating unit. It should be noted that only one instance within a control area should reference a specific generating unit.

Describes an area having energy production or consumption. Specializations are intended to support the load allocation function as typically required in energy management systems or planning studies to allocate hypothesized load levels to individual load points for power flow analysis. Often the energy area can be linked to both measured and forecast load levels.

A multi-purpose curve or functional relationship between an independent variable (X-axis) and dependent (Y-axis) variables.

Group of similar days. For example it could be used to represent weekdays, weekend, or holidays.

Models the characteristic response of the load demand due to changes in system conditions such as voltage and frequency. It is not related to demand response. If LoadResponseCharacteristic.exponentModel is True, the exponential voltage or frequency dependent models are specified and used as to calculate active and reactive power components of the load model. The equations to calculate active and reactive power components of the load model are internal to the power flow calculation, hence they use different quantities depending on the use case of the data exchange. The equations for exponential voltage dependent load model injected power are: pInjection= Pnominal* (Voltage/cim:BaseVoltage.nominalVoltage) ** cim:LoadResponseCharacteristic.pVoltageExponent qInjection= Qnominal* (Voltage/cim:BaseVoltage.nominalVoltage) ** cim:LoadResponseCharacteristic.qVoltageExponent Where: 1) * means "multiply" and ** is "raised to power of"; 2) Pnominal and Qnominal represent the active power and reactive power at nominal voltage as any load described by the voltage exponential model shall be given at nominal voltage. This means that EnergyConsumer.p and EnergyConsumer.q are at nominal voltage. 3) After power flow is solved: -pInjection and qInjection correspond to SvPowerflow.p and SvPowerflow.q respectively. - Voltage corresponds to SvVoltage.v at the TopologicalNode where the load is connected.

The fossil fuel consumed by the non-nuclear thermal generating unit. For example, coal, oil, gas, etc. These are the specific fuels that the generating unit can consume.

The operational meaning of a category of limits.

Describes a tabular curve for how the phase angle difference and impedance varies with the tap step.

Describes a curve for how the voltage magnitude and impedance varies with the tap step.

A specified time period of the year.

A Measurement represents any measured, calculated or non-measured non-calculated quantity. Any piece of equipment may contain Measurements, e.g. a substation may have temperature measurements and door open indications, a transformer may have oil temperature and tank pressure measurements, a bay may contain a number of power flow measurements and a Breaker may contain a switch status measurement. The PSR - Measurement association is intended to capture this use of Measurement and is included in the naming hierarchy based on EquipmentContainer. The naming hierarchy typically has Measurements as leaves, e.g. Substation-VoltageLevel-Bay-Switch-Measurement. Some Measurements represent quantities related to a particular sensor location in the network, e.g. a voltage transformer (VT) or potential transformer (PT) at a busbar or a current transformer (CT) at the bar between a breaker and an isolator. The sensing position is not captured in the PSR - Measurement association. Instead it is captured by the Measurement - Terminal association that is used to define the sensing location in the network topology. The location is defined by the connection of the Terminal to ConductingEquipment. If both a Terminal and PSR are associated, and the PSR is of type ConductingEquipment, the associated Terminal should belong to that ConductingEquipment instance. When the sensor location is needed both Measurement-PSR and Measurement-Terminal are used. The Measurement-Terminal association is never used alone.

Specifies one limit value for a Measurement. A Measurement typically has several limits that are kept together by the LimitSet class. The actual meaning and use of a Limit instance (i.e., if it is an alarm or warning limit or if it is a high or low limit) is not captured in the Limit class. However the name of a Limit instance may indicate both meaning and use.

Specifies a set of Limits that are associated with a Measurement. A Measurement may have several LimitSets corresponding to seasonal or other changing conditions. The condition is captured in the name and description attributes. The same LimitSet may be used for several Measurements. In particular percentage limits are used this way.

Describes the translation of a set of values into a name and is intendend to facilitate custom translations. Each ValueAliasSet has a name, description etc. A specific Measurement may represent a discrete state like Open, Closed, Intermediate etc. This requires a translation from the MeasurementValue.value number to a string, e.g. 0-&gt;"Invalid", 1-&gt;"Open", 2-&gt;"Closed", 3-&gt;"Intermediate". Each ValueToAlias member in ValueAliasSet.Value describe a mapping for one particular value to a name.

The class describe a measurement or control value. The purpose is to enable having attributes and associations common for measurement and control.

MeasurementValueSource describes the alternative sources updating a MeasurementValue. User conventions for how to use the MeasurementValueSource attributes are defined in IEC 61970-301.

Describes the translation of one particular value into a name, e.g. 1 as "Open".

The place, scene, or point of something where someone or something has been, is, and/or will be at a given moment in time. It can be defined with one or more position points (coordinates) in a given coordinate system.

Coordinate reference system.