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|  PDSH 998) ~: B: y: v" H( l
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| Measurement of circuit power factor and supply current8 S# ^ Q, Z* W* O C3 D
| General$ ]3 z& `' H4 A- A5 X2 ]) A
| 60968(ed.1);am1;am2 & 60969(ed.1);am1;am2
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Standard(s):1 P1 B* q5 _: T6 E2 v
IEC 60968 All editions
. z) x8 ?! Z; C! F) j) SIEC 60969 All editions% o1 G B9 @1 @( I' w7 t1 e
Subclause(s): General
8 E# b% H# O! Q, F _. X6 n! c/ xNo. Year PDSH 0998 2010
% n& h; E: t% o4 d+ u! QCategory: LITE
; b" X) U' Y; ^5 V1 b: aDeveloped by: ETF5 OSM/LUM
4 Y7 f7 N# U( k8 G9 y/ xSubject:
$ S6 e: C0 m, V" O* ^6 p$ |Measurement of circuit power factor and supply current9 v4 i4 A) W+ ~: O6 x
Key words:+ U; W+ A2 r. P; j, v( W
- True power factor! C1 Q t$ d3 Q- w
- Supply current
' W5 i5 y0 h! D( S- High frequency components
; w4 t! |9 u, {2 XTo be approved at the 49th CTL Plenary Meeting, in 2012: D9 R/ u) b' ^1 x0 g9 X! F
Question:
! k* j' h- J& V/ `9 G q* b) uWhen measuring the circuit power factor and supply current of non linear load (a self-ballasted lamp), we, y& ?+ S6 l" ]1 U P
would like to check if there is a need to consider the frequency range of the power meter. The product in j3 f( W$ q* _/ P& b% T
question produced high frequency components as shown in Figure 1. The true power factor can only be
; y- I# @- i6 umeasured with power meter set to encompass these high frequencies. With the power meter’s frequency range1 a9 t. w* G$ f8 y9 {. r8 _, q2 v: n
specified from d.c. to 25 KHz, the power meter reads a power factor of 0,880 and a current of 330 mA. As the9 N# l0 r4 K% T
frequency range was extended to 50 KHz, we found the power factor is much lower compared with cos f
- T$ _. B3 C- J3 [/ O(power factor measured at fundamental frequency). Which value of power factor can we accept on the product
?" b, b, n$ x V$ s( N1 K3 oor on the manufacturer catalogue?0 |0 L2 `" @# [( n
Decision:, I: _! S, X9 S1 \( B: f
In case of high harmonics and high crest factor, to get an accurate measurement, a power meter with a higher
" e6 O" ^0 j3 U8 ^frequency range has to be used.
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