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|  PDSH 998( o8 [& b7 d/ T" S! T
* @# U% @2 U3 { | Measurement of circuit power factor and supply current
0 X! V& R5 u' _$ h) |: d, X | General# ^+ }1 l$ g: }% v0 d- D6 N
| 60968(ed.1);am1;am2 & 60969(ed.1);am1;am2
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Standard(s):
7 F" U, x1 C" g6 D E% S' fIEC 60968 All editions- ^% i8 g8 D. H( v6 U
IEC 60969 All editions6 t2 v& |* g+ [; I* b; q: V
Subclause(s): General
/ \3 G( s ~1 e# x( D1 NNo. Year PDSH 0998 2010' }& U& e0 M" J+ [2 C) z9 ^8 p: B- g
Category: LITE z) m) g& p$ z6 V* c2 M+ r
Developed by: ETF5 OSM/LUM
6 B" H2 p: }( F/ N9 @5 j" fSubject:' s; g: R! O2 a" t3 k' _
Measurement of circuit power factor and supply current
" G& h0 u: p" M& r" sKey words:
8 ~! Y1 a9 r0 ~; N8 t7 @3 S- True power factor7 D) N& P; I0 U9 x$ [+ b |+ I
- Supply current" k8 A! A3 H: Y* u
- High frequency components9 a8 z& G( C8 V2 Y
To be approved at the 49th CTL Plenary Meeting, in 2012
2 }2 K) F5 @0 u" B5 E$ sQuestion:
2 r- Z3 ^9 ^# Q8 GWhen measuring the circuit power factor and supply current of non linear load (a self-ballasted lamp), we
* x6 M/ J8 \% |7 X$ e3 kwould like to check if there is a need to consider the frequency range of the power meter. The product in
; w9 O/ `% O2 B/ Cquestion produced high frequency components as shown in Figure 1. The true power factor can only be H% z( ]# w$ t! Q
measured with power meter set to encompass these high frequencies. With the power meter’s frequency range+ R, [7 ]4 G4 f# g
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
- e& \) \+ i" ufrequency range was extended to 50 KHz, we found the power factor is much lower compared with cos f
2 j4 j2 q& F" c& U(power factor measured at fundamental frequency). Which value of power factor can we accept on the product
5 U) Q1 Y7 m/ b4 n, J+ G! ^or on the manufacturer catalogue?
; _4 o+ W7 h5 o: _Decision:
; ^+ j- p2 ]' H0 ]In case of high harmonics and high crest factor, to get an accurate measurement, a power meter with a higher
. n: n5 z, D; O5 ^* afrequency range has to be used.
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发表于 2012-9-15 14:56
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