PDSH 998 Measurement of circuit power factor and supply current

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PDSH 998 7 s! L4 Q) }. b7 Y9 ?- s" C

Measurement of circuit power factor and supply current

General

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

# c- f) T3 t0 d' \$ N) Z1 }& DStandard(s):
IEC 60968 All editions
/ h' _; v& k' }$ R. `9 I* y: ^+ eIEC 60969 All editions
Subclause(s): General
No. Year PDSH 0998 2010
! Z6 }1 M9 C' LCategory: LITE
3 g! }! u6 e9 p6 x, n- rDeveloped by: ETF5 OSM/LUM
. `7 K0 o) W& HSubject:
4 n5 R& {) I' f6 Y7 rMeasurement of circuit power factor and supply current
9 Q' w" ]6 O( A$ y8 }Key words:
- True power factor
- Supply current
9 }2 k" a6 C+ ^$ q1 Y/ B0 y- High frequency components
* \& t9 Z) A0 e! j$ [, C1 B; P6 UTo be approved at the 49th CTL Plenary Meeting, in 2012
# J1 t9 A3 D' i6 D7 rQuestion:
8 j6 ], L; S8 O' Y: h( [5 B0 M+ qWhen measuring the circuit power factor and supply current of non linear load (a self-ballasted lamp), we
( C: E% Q1 s# mwould like to check if there is a need to consider the frequency range of the power meter. The product in
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
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
frequency 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
( Q& N9 Y/ M) V/ f  \or on the manufacturer catalogue?
Decision:
+ J$ c4 c1 q& I+ J7 i! GIn case of high harmonics and high crest factor, to get an accurate measurement, a power meter with a higher
0 p% a( ?; D/ t$ C/ w6 Efrequency range has to be used.
' C* a" y& p, C% e1 S8 [! _
$ [4 R& Y2 S) z' @* Q0 Z

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