3. Measurements and functions
3.1 Measured and calculated values
Almost all the electric parameters in power systems can be measured by the MIB. Some of the parameters which are special will be
described in this part.
Reactive power (Q)
MIB adopts two definitions of reactive power:
1. Sinusoidal reactive power.
• The formula is as follows:
•
2. Nonsinusoidal reactive power.
• The formula is as follows:
•
Apparent power (S)
System total apparent power is measured and displayed.
Power factor (PF)
3-phase power factor and system total power factor are measured and displayed.
Frequency (F)
The frequency of L1 phase voltage input is measured as system frequency.
Energy (kWh)
Energy is time integral of power. The unit is kWh.
Import energy (imp)
"-"
Export energy (exp)
“+” is not shown in the display.
Reactive energy (kVArh)
Reactive energy is time integral of reactive power. The unit is kVArh.
Import energy (imp)
Capacitive energy.
Export energy (exp)
Inductive energy. Energy terms are based on the generator method.
Harmonic parameter : Total harmonic distortion
This factor is often used to express the power quality of the power system. The formula is as follows:
DESIGNER'S HANDBOOK 4189320063D EN Page 9 of 23
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