IEC 61000-3-3-2021 pdf free download – Electromagnetic compatibility (EMC) – Part 3-3: Limits – Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤ 16 A per phase and not subject to conditional connection.
This part of EC 61000 is concerned with the limitation of voltage fluctuations and flickerimpressed on the public low-voltage system.
lt specifies limits of voltage changes which may be produced by an equipment tested underspecified conditions and gives guidance on methods of assessment.
This part of lEC 61000 is applicable to electrical and electronic equipment having an inputcurrent equal to or less than 16 A per phase，intended to be connected to public low-voltagedistribution systems of between 220 V and 250 V line to neutral at 50 Hz, and not subject toconditional connection.
Equipment which does not comply with the limits of this part of lEC 61000 when tested withthe reference impedance Zref of 6.4,and which therefore cannot be declared compliant withthis part,may be retested or evaluated to show conformity with lEC 61000-3-11.Part 3-11 isapplicable to equipment with rated input current s 75 A per phase and subject to conditionalconnection.
The tests according to this part are type tests. Particular test conditions are given in Annex Aand the test circuit is shown in Figure 1.
NOTE 1 The limits in this standard relate to the voltage changes experienced by consumers connected at theinterface between the public supply low-voltage network and the equipment user’s installation.Consequently, if theactual impedance of the supply at the supply terminals of equipment connected within the equipment user’sinstallation exceeds the test impedance, it is possible that supply disturbance exceeding the limits could occur.
NOTE 2 The limits in this standard are based mainly on the subjective severity of flicker imposed on the light from230 v 60 w coiled-coil filament lamps by fluctuations of the supply voltage.For systems with nominal voltage lessthan 220 V line to neutral and/or frequency of 60 Hz,the limits and reference circuit values are underconsideration.
2Normative references
The following documents, in whole or in part,are normatively referenced in this document andare indispensable for its application.For dated references,only the edition cited applies. Forundated’ references,the ‘latest edition of the referenced document (including anyamendments) applies.
IEC/TR 60725,Consideration of reference impedances and public supply impedances for usein determining disturbance characteristics of electrical equipment having a rated current≤75 A per phase
lEC 60974-1,Arc welding equipment – Part 1: Welding power sources
IEC 61000-3-2，Electromagnetic compatibility (EMC) – Part 3-2: Limits -Limits for harmoniccurrent emissions (equipment input current s 16 A per phase)
IEC 61000-3-11，Electromagnetic compatibility (EMC) – Part 3-11: Limits – Limitation ofvoltage changes，voltage fluctuations and flicker in public low-voltage supply systems -Equipment with rated current ≤ 75 A and subject to conditional connection
lEC 61000-4-15:2010，Electromagnetic compatibility (EMC) – Part 4-15: Testing andmeasurement techniques – Flickermeter – Functional and design specifications
3Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
flicker
impression of unsteadiness of visual sensation induced by a light stimulus whose luminanceor spectral distribution fluctuates with time
[SoURCE: IEC 60050-161:1990,161-08-13]
3.2
voltage change characteristicd(t)
time function of the relative r.m.s. voltage change evaluated as a single value for eachsuccessive half period between zero-crossings of the source voltage，except during timeintervals in which the voltage is in a steady-state condition for at least i s
Note 1 to entry: For detailed information about the evaluation of a voltage change characteristic and the definitionof a steady state condition see Annex C and lEC 61000-4-15:2010.
3.3
dc
maximum steady state voltage change during an observation period
Note 1 to entry: For detailed information about the calculation of d。see Annex C and lEC 61000-4-15:2010.
3.4
dmax
maximum absolute voltage change during an observation period
Note 1 to entry: For detailed information about the calculation of dmay see Annex C and IEC 61000-4-15:2010.IEC 61000-3-3 pdf download.