PDSH 998 Measurement of circuit power factor and supply current

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PDSH 998 " H; c  [( Q. @

Measurement of circuit power factor and supply current 6 v! _# `/ p) c+ y

General

60968(ed.1);am1;am2 & 60969(ed.1);am1;am2 / D0 `) K+ c2 y

8 J. |: A6 M6 l) U2 R8 C- wStandard(s):
7 a: a8 g" ]5 k6 K! FIEC 60968 All editions
IEC 60969 All editions
! ~" ~* O7 Z3 y0 Y+ @% l( ZSubclause(s): General
No. Year PDSH 0998 2010
) Y& ?# Y+ q! M; W8 d/ YCategory: LITE
. E' j6 i4 b+ Q; PDeveloped by: ETF5 OSM/LUM
Subject:
  o8 L# O% Q# a  B4 D- WMeasurement of circuit power factor and supply current
0 h. i0 l. A( f2 y% fKey words:
- True power factor
' N4 X: R, ?% n0 q/ j" E- Supply current
  x/ k) ]2 }9 c* _; P, E$ D: J0 q- High frequency components
; H6 G* \  G# I9 e' }* xTo be approved at the 49th CTL Plenary Meeting, in 2012
" O: [$ s+ K' X# t8 D' a2 M: mQuestion:
5 Y( A4 r5 w1 T" G( M* U' V& sWhen measuring the circuit power factor and supply current of non linear load (a self-ballasted lamp), we
" D$ F! X& L- Zwould like to check if there is a need to consider the frequency range of the power meter. The product in
. E+ R* f* u( f( |! l2 h% bquestion produced high frequency components as shown in Figure 1. The true power factor can only be
! b: ]# }/ X9 k$ V2 _. ?7 nmeasured with power meter set to encompass these high frequencies. With the power meter’s frequency range
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
7 J8 v* ^1 C0 o  bfrequency range was extended to 50 KHz, we found the power factor is much lower compared with cos f
. X% r  k9 p6 u/ {, ~(power factor measured at fundamental frequency). Which value of power factor can we accept on the product
or on the manufacturer catalogue?
, X. w" K0 u3 c# i7 cDecision:
In case of high harmonics and high crest factor, to get an accurate measurement, a power meter with a higher
$ r; R6 L* u' j- Ofrequency range has to be used.

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