Schneider Electric K series Instrukcja Użytkownika Pobierz pdf (Strona 32)

PM1000 Series Power Meters PLSED309039EN

Chapter 3 – AC Power Measurement 08/2010

Consumption and Poor Power Factor

CONSUMPTION: Wh = W x T, where W = instantaneous power, T = time in

hours.

The total electric energy usage over a time period is the consumption of Wh.

Typically, the unit in which consumption is specified is the kilowatt-hour

(kWh): one thousand watts consumed over one hour. Utilities use the Wh

equation to determine the overall consumption in a billing period.

Poor power factor: Results in reactive power consumption. Transferring

reactive power over a distribution network causes energy loss. To force

consumers to correct their power factor, utilities monitor reactive power

consumption and penalize the user for poor power factor.

―3D‖ kVA Measurement

The power meters are equipped with 3D Measurement of kVA. This

advanced method provides the most accurate and predictable measurement

under unbalanced as well as distorted waveform conditions.

However, in case the power meters need to match the reading of older or

simpler power meters, which use the Arithmetic kVA definition, this too is

available as a Setup option.

Table 3-1: ―3D‖ kVA Measurement

kVA

Function

Formula

Other

Names

Which one?

3D Factory

setting





222

DVARWkVA

Where D = Distortion Power per IEEE 100

Apparent,

Vector kVA

Best, all around

Arth

321

kVAkVAkVA

Arth

kVA 

Arithmetic,

Scalar kVA

Good under

Low unbalance,

to match

simpler meters

without 3D

capability

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 80 81

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