Idle And Active Power - VOLTWERK VC 200 Instrucciones De Servicio

3.7.2
Transformerless central inverter
Power factor Cos ϕ
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Response speed with specification of the nominal value by the
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GridControl.
Specified Cos ϕ.
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Please note that the consumer reference arrow system is applicable
here.
Reference arrows specify the direction in which the specified
parameter is to be assessed as positive. In the consumer reference
arrow system, the reference arrows for current and voltage are
counted as positive. The current and voltage are oriented in the same
direction to the load.
For more background information on the parameters, see the integrated
help pages and also the information on parameters in the download area
of the manufacturer's home page.

Idle and active power

In the alternating current, the phase shift must be taken into account when
considering the output. With a phase shift of 90°, the output takes on
alternately positive and negative values. During a phase shift, a so-called
idle power occurs. Together with the so-called active power, this forms the
apparent power. The difference between the idle power and the active
power is that active power represents usable power and idle power does
not.
cos ϕ
P: Active power in W
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Q: Idle power in VAr
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S: Apparent power in VA
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In the alternating current, the power is calculated using Pythagoras'
theorem.
2 2 2
P + Q = S
The ratio between the active power and the apparent power is the
displacement factor Cos ϕ.
Cos ϕ = P/S
Please note:
In accordance with DIN 40110-1, Cos ϕ is designated as the efficiency
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factor. As, however, Cos ϕ is frequently designated as the power factor
in practice, we follow this convention here.
Operating manual
3 Technical description
S
P
Q
35