Ht-instruments PQA820 Manual de usuario descargar pdf (Pagina 27)

PQA820

EN – 26

12.3. DEFINITIONS OF POWER AND POWER FACTOR

In a generic electrical system, powered by a sequence of sinusoidal voltages, the following

is defined:

Phase Active Power:

(n=1,2,3)

)cos(IVP

nnnNn







Phase Apparent Power:

(n=1,2,3)

nnNn

IVS 



Phase Reactive Power:

(n=1,2,3)

nnn

PSQ 

Phase Power Factor:

(n=1,2,3)

P 

Total Active Power:

321

PPPP

TOT





Total Reactive Power:

321

QQQQ

TOT





Total Apparent Power:

TOTTOTTOT

QPS 

Total Power Factor:

TOT

P 

where:

= Efficient value of voltage between phase n and neutral.

= Efficient value of the current of phase n.

= Phase angle between voltage and current of phase n.

With distorted voltages and currents, the above-reported ratios change as follows:

Phase Active Power:

(n=1,2,3)

)(IVP



cos







Phase Apparent Power:

(n=1,2,3)

nnNn

IVS 



Phase Reactive Power:

(n=1,2,3)

nnn

PSQ 

Phase Power Factor:

(n=1,2,3)

P 

Depurate Power Factor:

(n=1,2,3)

dPF

=cosf

= phase angle between

the voltage and current

fundamentals of phase

Total Active Power:

321

PPPP

TOT





Total Reactive Power:

321

QQQQ

TOT





Total Apparent Power:

TOTTOTTOT

QPS 

Total Power Factor:

TOT

P 

where:

= Efficient value of the k-nth voltage harmonic between phase n and neutral.

= Efficient value of the k-nth current harmonic of phase n.

= Phase angle between the k-nth voltage harmonic and the k-nth current harmonic of

phase n

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Ht-instruments PQA820 Manual de usuario Pagina 27

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