DERUnitSymbol

Class Description

The units defined for usage in the CIM.

Attributes

Name	Type	Description
A		Current in Ampere.
Ah		Ampere-hours, Ampere-hours.
As		Ampere seconds (A·s).
Btu		Energy, British Thermal Unit.
Hz		Frequency in Hertz (1/s).
Q		Quantity power, Q.
Qh		Quantity energy, Qh.
V		Electric potential in Volt (W/A).
VA		Apparent power in Volt Ampere (See also real power and reactive power.)
VAh		Apparent energy in Volt Ampere hours.
VAr		Reactive power in Volt Ampere reactive. The “reactive” or “imaginary” component of electrical power (VIsin(phi)). (See also real power and apparent power). Note: Different meter designs use different methods to arrive at their results. Some meters may compute reactive power as an arithmetic value, while others compute the value vectorially. The data consumer should determine the method in use and the suitability of the measurement for the intended purpose.
VArh		Reactive energy in Volt Ampere reactive hours.
VPerVA		Power factor, PF, the ratio of the active power to the apparent power. Note: The sign convention used for power factor will differ between IEC meters and EEI (ANSI) meters. It is assumed that the data consumers understand the type of meter being used and agree on the sign convention in use at any given utility.
VPerVAr		Power factor, PF, the ratio of the active power to the apparent power. Note: The sign convention used for power factor will differ between IEC meters and EEI (ANSI) meters. It is assumed that the data consumers understand the type of meter being used and agree on the sign convention in use at any given utility.
Vh		Volt-hour, Volt hours.
Vs		Volt second (Ws/A).
W		Real power in Watt (J/s). Electrical power may have real and reactive components. The real portion of electrical power (I²R or VIcos(phi)), is expressed in Watts. (See also apparent power and reactive power.)
WPerA		Active power per current flow, watt per Ampere.
WPers		Ramp rate in Watt per second.
Wh		Real energy in Watt hours.
deg		Plane angle in degrees.
degC		Relative temperature in degrees Celsius. In the SI unit system the symbol is ºC. Electric charge is measured in coulomb that has the unit symbol C. To distinguish degree Celsius form coulomb the symbol used in the UML is degC. Reason for not using ºC is the special character º is difficult to manage in software.
h		Time, hour = 60 min = 3600 s.
min		Time, minute = 60 s.
ohm		Electric resistance in ohm (V/A).
ohmPerm		Electric resistance per length in ohm per metre ((V/A)/m).
ohmm		resistivity, Ohm metre, (rho).
onePerHz		Reciprocal of frequency (1/Hz).
s		Time in seconds.
therm		Energy, Therm.

Relationships

Ancestors

No ancestor classes

Descendents

No descendent classes

Associations

None