CENELEC on It is based on IEC In the meantime two amendments (A and. A) have been published. Since February . IEC Limits for harmonic current emissions (equipment input current ≤ ≤ 16A per phase). IEC Limitation of emission of harmonic currents. For more detailed information please refer to the relevant standards available from the organization concerned. Harmonics standard IEC Ed. 3
|Published (Last):||27 November 2013|
|PDF File Size:||12.96 Mb|
|ePub File Size:||2.94 Mb|
|Price:||Free* [*Free Regsitration Required]|
Figure 2 Test setup to verify harmonic analysis accuracy. As the reader will have realized, it is not overly complex to do a first-order confidence check for a harmonics and voltage changes product compliance test system.
Electromagnetic compatibility EMC Part 1: European Generic emission standard Part 1 Domestic, commercial and light industry environment, replaced by EN To guarantee a voltage distortion below 0. Since many systems are used for both harmonics and voltage change 6010-3-2, the system setup often includes a hard-wired reference impedance.
Table 2 Harmonic emissions of a dimmer Fig. Any reactance, other than the negligible parasitic inductance and capacitance of 6100–3-2 heater, leads iwc measurement errors. A compliance test laboratory generally needs to be able to test all products, hence the power source and interconnect impedance need to meet the most stringent demands.
If however, the lower order harmonics say below the 15th show discrepancies that exceed 10 mA, one has to be concerned and look into the subject system in more detail.
Also, for Class C and D products, the voltage crest factor given in Table 1 needs to iwc considered.
EMC Information Centre – The EMC Journal (Free in the UK)
We will deal with these possible analyzer errors later. Perhaps a few words of caution regarding the foregoing dimmer test. Immunity – Product family standard Requirements for household appliances, electric tools and similar apparatus.
With these system characteristics, and a voltage source that remains below the maximum permitted distortion levels given in Table 1, the impact on measurement errors due to system characteristics will be negligible, and we can now concentrate on the harmonics analyzer itself. Subpart A contains a general provision that “devices may not cause interference and must accept interference from other sources.
Description of the environment – Electromagnetic environment for low-frequency conducted disturbances and signaling in public power supply systems. Since this data processing includes the Fourier analysis, data averaging of 40 harmonics, calculating active power, power factor, and comparison against harmonics limits, the analyzer is not a simple instrument.
Table 1 Power supply source requirements for IEC harmonics test systems.
Meanwhile, this third edition of IEC has been superseded by the 4th edition: Electromagnetic compatibility EMC Part Only systems having gross performance problems may give erroneous assessments, but these errors are easily identified, even by untrained technicians, as will be shown below.
Small firing angle errors of a few degrees barely affect the harmonic current amplitudes as the values in Table 2 below show. Thus, if the reference impedance by itself were set to the IEC values, the total system impedance would definitely be too high, resulting in voltage-change measurement values that are proportionally high as well.
European Immunity to short dips in the power supply. Testing and measurement techniques – Section The standard IEC First we will assume that the analyzer is fully compliant with the standard, and concentrate on system integration issues, because these have been shown to occur more frequently. Furthermore, one can do a simple P st test, by turning the load on irc off in 7 s intervals.
The 60 W lamp is mainly intended to have some load, so that the power source is not running idle. Since the system impedance includes not only the power source, but also the interconnect wiring, plus possibly a current shunt resistance in the harmonics analyzer, the source output by itself needs to have only a fraction of the total permitted impedance. This article seeks to discuss and explain these errors. Controlling a resistive load with a dimmer allows the user to verify a number of parameters, because the current waveform not only has well defined properties see Table 2 and Fig.
Road vehicles Part 3: While so-called steady state harmonics products with a constant power draw represent few problems, fluctuating harmonics can present real challenges for the analyzer. Uncertainties, statistics and limit modeling Uncertainties in-standardized EMC tests. Flickermeter – Functional and design specifications.
IEC – Wikipedia
Off-vehicle radiation source 61000-3-2 test methods for electrical disturbances from narrow band radiated electromagnetic energy.
Agenda on its way shortly. Furthermore, note that the harmonics pairs such as the fifth and seventh are of the same amplitude but of opposite phase at the zero-crossings of the fundamental. If the load differs from the 8 A example, resulting in a different voltage change, simply adjust the expected reading proportionally.
Voltage fluctuation immunity test for equipment with input current not exceeding 16 A per phase. The resulting neutral conductor can be larger than the current in each of the phases R, S and T.
This edition 610-3-2 already withdrawn, and now the 5th edition IEC Also, NPL has offered product certification services for a number of years, and has made details about testing methods available in the form of papers.
With present day components with wide use, e. Immunity requirements in the frequency range 0 Hz to GHz are covered.
In yet another case, the EMC test house used their V 50 Hz generator as the power source for voltage changes testing. Testing and measurement techniques Surge immunity test. Testing and measurement techniques Power frequency magnetic field immunity test.
With the system configured for harmonics testing, i. In the above example, one could, of course, modulate the dimmer control?