Automation function is a collection of functional block or other automation function that can be executed as a work cycle program as part of an automated system.

Control function block is a function block that contains an algorithm for controlling the equipment.

Frequency control function is a function block that calculate the operating point of the controlled equipment to achieve the target frequency.

Function block is a function described as a set of elementary blocks. The blocks describe the function between input variables and output variables.

The parts of a power system that are physical devices, electronic or mechanical.

Monetary currencies. ISO 4217 standard including 3-character currency code.

The derived units defined for usage in the CIM. In some cases, the derived unit is equal to an SI unit. Whenever possible, the standard derived symbol is used instead of the formula for the derived unit. For example, the unit symbol Farad is defined as "F" instead of "CPerV". In cases where a standard symbol does not exist for a derived unit, the formula for the unit is used as the unit symbol. For example, density does not have a standard symbol and so it is represented as "kgPerm3kgPerm^3". With the exception of the "kg", which is an SI unit, the unit symbols do not contain multipliers and therefore represent the base derived unit to which a multiplier can be applied as a whole. Every unit symbol is treated as an unparseable text as if it were a single-letter symbol. The meaning of each unit symbol is defined by the accompanying descriptive text and not by the text contents of the unit symbol. To allow the widest possible range of serializations without requiring special character handling, several substitutions are made which deviate from the format described in IEC 80000-1. The division symbol "/" is replaced by the letters "Per". Exponents are written in plain text after the unit as "m3" instead of being formatted as "m" with a superscript of 3 or introducing a symbol as in "m^3". The degreeletters symbol "°deg" isare used replacedinstead withof the lettersdegree "deg"symbol. Any clarification of the meaning for a substitution is included in the description for the unit symbol. Non-SI units are included in list of unit symbols to allow sources of data to be correctly labelled with their non-SI units (for example, a GPS sensor that is reporting numbers that represent feet instead of meters). This allows software to use the unit symbol information correctly convert and scale the raw data of those sources into SI-based units. The integer values are used for harmonization with IEC 61850.

This class represents the external network and is used for IEC 60909 calculations. It is only used if EquivalentInjection cannot provide the details required by IEC 60909 on short circuit equivalent of an external network. This class represents the external network for use in power flow and short-circuit calculations. In the power flow domain the external network is modelled as a power injection with power limits and a power-frequency bias. For short-circuit calculations the external network is modelled as the “network feeders” element defined in section 6.2 of IEC60909-0:2016. Boolean flag ikSecond allows short-circuit calculations using the superposition method to detect that the maximum and minimum initial symmetrical short-circuit currents have to be corrected for the fact that they were calculated according the IEC60909-0 method.

An overcurrent protective device with a circuit opening fusible part that is heated and severed by the passage of overcurrent through it. A fuse is considered a switching device because it breaks current.

Per length phase impedance matrix entry describes impedance and conductance matrix element values for a specific row and column of the matrix. The phases to which each entry applies can be determined by means of the row and column attributes which bind to a sequence number provided in either ACLineSegmentPhase or WirePosition (which also specify phase). Due to physical symmetry that is reflected in the matrix, only the lower triangle of the matrix is populated with the row and column method. That is, the column attribute is always less than or equal to the row attribute.

Describes a tap changer with a linear relation between the tap step and the phase angle difference across the transformer. This is a mathematical model that is an approximation of a real phase tap changer. The phase angle is computed as stepPhaseShiftIncrement times the tap position. The voltage magnitude of both sides is the same.

The non-linear phase tap changer describes the non-linear behaviour of a phase tap changer. This is a base class for the symmetrical and asymmetrical phase tap changer models. The details of these models can be found in IEC 61970-301.

Single phase of a multi-phase switch when its attributes might be different per phase.