DERUnitSymbol

Class Description

The units defined for usage in the CIM.

Attributes

Name Type Description
s Time in seconds.
A Current in Ampere.
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.
V Electric potential in Volt (W/A).
ohm Electric resistance in ohm (V/A).
Hz Frequency in Hertz (1/s).
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.)
VA Apparent power in Volt Ampere (See also real power and reactive power.)
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.
Vs Volt second (Ws/A).
As Ampere seconds (A·s).
VAh Apparent energy in Volt Ampere hours.
Wh Real energy in Watt hours.
VArh Reactive energy in Volt Ampere reactive hours.
WPers Ramp rate in Watt per second.
h Time, hour = 60 min = 3600 s.
min Time, minute = 60 s.
Q Quantity power, Q.
Qh Quantity energy, Qh.
ohmm resistivity, Ohm metre, (rho).
Ah Ampere-hours, Ampere-hours.
Btu Energy, British Thermal Unit.
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.
therm Energy, Therm.
Vh Volt-hour, Volt hours.
WPerA Active power per current flow, watt per Ampere.
onePerHz Reciprocal of frequency (1/Hz).
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.
ohmPerm Electric resistance per length in ohm per metre ((V/A)/m).

Relationships

Inherits from

  • None

Descendant classes

  • No descendant classes

Leaf/Root class

IsLeaf IsRoot
False False

Associations

None