Understanding IEC61000 for Harmonics Compliance

IEC61000 applies for loads < 16A. It is a standard to : 1) Classify the Loads 2) Set max permissiblelimits of harmonics for each type of classification

volta

ge

time

Full wave rectifier stage waveforms;a. Input voltage b. Output voltage c. input current

SPEA-1Single Phase Energy Analyzer

SPEA-1 lets you view and analyse the harmonics

AN-102

a

b

c

HarmonicAnalysis

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HARMONICS STANDARDSOF DIFFERENT EQUIPMENTS

(according to IEC61000)

There are four classes of equipments

Class A: Balanced three phase equipmentsHousehold appliances, excluding equipment identified by class DTools excluding portable toolsDimmers for incandescent lampsAudio equipmentsEverything else that is not classified as B, C, or D

Harmonic Table:

Harmonic order(n) Maximum Permissible Harmonic current (A) Odd Harmonics

35791113

15<n<39

2.301.10.770.400.330.21

0.1515n

Even Harmonics

246

8<n<40

1.080.430.30

0.238n

AN-102

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Class B: Portable toolsArc welding equipments which is not professional equipments

Class C: Lighting equipments

Harmonic Table:

Harmonic order(n)

Maximum PermissibleHarmonics current Expressedas a Percentage of the InputCurrent at the Fundamental

Frequency (%)

Odd Harmonics only

23579

11<n<39

230x *

10753

* is the circuit power factor

AN-102

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Class D: Personal computer and monitorsTelevision receiversNote: Equipment must have power level 75 W up to and not exceeding 600 W

Harmonic order (n)

Maximumpermissible

Harmonic Currentper Watt (mA/W)

MaximumPermissible

Harmonic Current(A)

357911

13<n<39

3.41.91.00.50.353.85

2.301.140.770.400.33

see table 1

Harmonic Table:

TESTING EXAMPLE

Testing of 4W LED bulb by using SPEA-1

After simple source load connection you can show the following results:

Vrms- 222.1 volts VTHD- 4.0%Arms- 23.37 mA ATHD- 51.2%Watt- 3.825Watt V3rd harmonic value- 6.329Volts

AN-102

Complete harmonic table can be downloadedwww.embuilt.com

HARMONIC REPORT GENERATION

AN-102

SpectrumButton

For report generation just press

button and wait for about

30 seconds to load upto 55thharmonic. than click on graph icon in software

HARMONIC REPORTS

The User friendly software allows you to generate reports you can use to directly check confirmation to the IEC61000 standards

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