PDSH 998 Measurement of circuit power factor and supply current

小米

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

PDSH 998 $ |1 Q! {/ Z6 Y) f* @6 P) g9 x, S2 |

Measurement of circuit power factor and supply current

General & v$ C: T# V! ^. e1 b/ T

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

6 z4 g0 b6 S" C0 kStandard(s):
: P9 k& q9 {8 W0 a$ E$ B( X- W% sIEC 60968 All editions
IEC 60969 All editions
" W% x  J- L6 X8 A. {Subclause(s): General
$ E) Y8 }2 ?0 @+ Z& z/ K0 `No. Year PDSH 0998 2010
# J9 a9 F/ x! Y+ y: w, O/ j. ]Category: LITE
Developed by: ETF5 OSM/LUM
Subject:
Measurement of circuit power factor and supply current
Key words:
% Q/ u8 m. o. K- True power factor
! {. s; T, X3 B7 A* @- f" o' `- Supply current
- High frequency components
9 H+ e+ N/ k* z. i2 zTo be approved at the 49th CTL Plenary Meeting, in 2012
Question:
5 T7 j5 @+ \, p3 `, }/ SWhen measuring the circuit power factor and supply current of non linear load (a self-ballasted lamp), we
3 U9 \! f) H1 u* E9 ?6 m- ewould like to check if there is a need to consider the frequency range of the power meter. The product in
4 {4 L* U1 W9 T9 S& |, u$ |6 C7 bquestion produced high frequency components as shown in Figure 1. The true power factor can only be
! V9 z5 D6 Z  ~9 b) |9 Hmeasured with power meter set to encompass these high frequencies. With the power meter’s frequency range
% P4 n2 g# C# mspecified 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
3 d" C% Q0 V1 F/ ]$ @; H; a' H(power factor measured at fundamental frequency). Which value of power factor can we accept on the product
or on the manufacturer catalogue?
Decision:
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.
' `8 I5 g2 q9 [- A4 Q7 i, G, F
6 a# j+ J9 @" ~' \4 ^
6 @- h3 J. @* ]* k" @- Z+ g


, @$ `& F' k$ I- m/ b+ Q8 y) h
# m' d. @/ q8 u% q/ c