MIB
Installation Instructions and Reference Handbook
DEIF A/S
Page 37 of 50
Description of measurement and functions of the MIB
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):
Three-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.
