Fluke 1744 Manual do Utilizador descarregar pdf (Página 45)

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Users Manual

Formula for Plt Function

∑

Pst

Plt

Time

Flicker [%]

Interval length => 1 Pst

12 x interval length => 1 flicker value Plt

egb020.eps

Figure 17. Measuring Flicker Values

Unbalance

The ratio of negative-to-positive sequence harmonics is calculated, with the

angles and magnitudes of the phase voltages taken into account. These values

are averaged over the interval length defined in PQ Log.

Frequency

The line power frequency is measured and averaged over 10 seconds, and the

resulting values are divided into 42 classes for establishing statistics. Values

are also averaged over the interval length defined in PQ Log.

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 72 73

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Fluke 1744 Manual do Utilizador Página 45