PDSH 998 Measurement of circuit power factor and supply current

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PDSH 998 : N! i8 c9 V5 N( ~4 J5 h + V' V+ j4 h- o6 a/ D

Measurement of circuit power factor and supply current

General * H$ m8 ^4 x6 I3 D2 P- f* i" O! J

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

1 }5 i6 T3 c. P9 X$ rStandard(s):
$ N* x5 L! [2 m" [. W: }6 _IEC 60968 All editions
" }' j2 V0 K" l! K* [IEC 60969 All editions
( R6 u1 L0 o% H8 d7 O* a! qSubclause(s): General
4 `6 @* j) m) T  {" |3 F5 w) x& C# m6 M7 tNo. Year PDSH 0998 2010
Category: LITE
Developed by: ETF5 OSM/LUM
Subject:
Measurement of circuit power factor and supply current
2 U! Q; q7 u+ f/ B  lKey words:
- True power factor
. z7 Z+ e0 L2 Q5 J0 n& V- Supply current
' H+ h  t) z3 C) k- High frequency components
- F3 v" k8 q- q7 W! ?8 x! h9 bTo be approved at the 49th CTL Plenary Meeting, in 2012
% M& R2 h) y) A3 RQuestion:
$ j: B$ M* x5 LWhen measuring the circuit power factor and supply current of non linear load (a self-ballasted lamp), we
5 o2 }4 `& K  D1 U* u/ owould 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
5 Q! ^( n9 H( Mmeasured 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
2 z2 h; d: F3 g  O  Vfrequency range was extended to 50 KHz, we found the power factor is much lower compared with cos f
. }  W& }# p/ W5 Y' i) w/ u2 Y* \3 A(power factor measured at fundamental frequency). Which value of power factor can we accept on the product
' a* r' |( j, o# sor on the manufacturer catalogue?
Decision:
6 A2 j. E% I+ ]6 i0 C/ b9 x0 \In 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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