PDSH 998 Measurement of circuit power factor and supply current

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PDSH 998 ) }% \3 I0 M" p2 `* p1 I0 \7 H

Measurement of circuit power factor and supply current

General

60968(ed.1);am1;am2 & 60969(ed.1);am1;am2

5 e% m* C1 ~& R) G9 U) _: {Standard(s):
IEC 60968 All editions
' H# m4 U- d; \IEC 60969 All editions
( `3 p" h) }* CSubclause(s): General
$ e! L  Q2 h* R8 F- eNo. Year PDSH 0998 2010
: I. T9 E$ y+ `, D6 s7 I) s1 `Category: LITE
Developed by: ETF5 OSM/LUM
Subject:
3 J1 J  _( D3 K9 T$ r  PMeasurement of circuit power factor and supply current
Key words:
- True power factor
- Supply current
- f! A1 P- W6 L+ p5 `- High frequency components
  o2 X6 ?% q& d& h2 |) y. {To be approved at the 49th CTL Plenary Meeting, in 2012
Question:
$ f9 r6 |9 C) K0 \6 W# ^$ kWhen measuring the circuit power factor and supply current of non linear load (a self-ballasted lamp), we
would like to check if there is a need to consider the frequency range of the power meter. The product in
) {0 P8 x9 g1 a4 |; S  S2 [question produced high frequency components as shown in Figure 1. The true power factor can only be
measured with power meter set to encompass these high frequencies. With the power meter’s frequency range
  o2 R* O7 O8 y, Y$ {+ {specified from d.c. to 25 KHz, the power meter reads a power factor of 0,880 and a current of 330 mA. As the
& K5 Q& ~( ^0 R+ }& f* W# n2 Cfrequency range was extended to 50 KHz, we found the power factor is much lower compared with cos f
(power factor measured at fundamental frequency). Which value of power factor can we accept on the product
or on the manufacturer catalogue?
Decision:
  V  F4 a1 H9 u" E- yIn case of high harmonics and high crest factor, to get an accurate measurement, a power meter with a higher
frequency range has to be used.

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