This part of the scope involves limiting voltage fluctuations and flickers generated by public low-voltage power supply systems. This section specifies the limits for voltage changes that may occur under certain conditions in the tested equipment, and provides guidelines for evaluation methods. This section applies to electrical and electronic equipment with an input current equal to or less than 16A per phase, intended to be connected to a public low-voltage power supply system with a phase voltage of 220V to 250V and a frequency of 50Hz, and unconditionally connected. When tested with a reference impedance Z of 6.4, it does not comply with the limits of this part and therefore cannot be declared to comply with this part. For such equipment, retesting or evaluation can be conducted to indicate compliance with IEC 61000-3-11. IEC 61000-3-11 is applicable to equipment with a rated input current of ≤ 75A per phase and conditional connection. This part of the test is a type test, and the special test conditions are given in Appendix A. The test circuit is shown in Figure 1. Note. The limit values in this section are mainly determined based on the subjective severity of flickering of 230 V/60W spiral filament lamps caused by fluctuations in power supply voltage. For systems with a nominal phase voltage less than 220 V and/or a frequency of G0 11z, their limit values and reference circuit parameters are under consideration. 2 Normative References: The clauses in the following documents become the clauses of this section through reference in this section. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions do not apply to this section. However, parties to agreements based on this section are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this section. GB/T 4365-2003 Electrotechnical Terminology, Electromagnetic Compatibility (IEC 60050 (161), 199o), IDT) GB 4706.20-2004 Safety of household and similar electrical appliances - Special requirements for drum dryers (IEC 60335-2-11:2002, 1DT) GB 15579.1-2004 Safety requirements for arc welding equipment - Part 1: Welding power sources (IEC 60974-12000, IDT) GB 17625.1-2003 Electromagnetic compatibility limits, harmonic current emission limits (input current ≤ 16 A per phase of equipment) (IEC61000-3:2001, 1DT) GB 17625.3-2000 Electromagnetic Compatibility, Limits, Limitations on Voltage Fluctuations and Flashes Generated by Equipment with a Rated Current greater than 16A in Low Voltage Power Supply Systems (idt IEC 61000-3-5:1994) IEC 607251981 Consideration of Reference Impedance for Determining Disturbance Characteristics of Electrical Equipment for Household and Similar Purposes IEC 61000-3-11 Electromagnetic Compatibility (EMC) Part 3-11; Limits, voltage changes generated by equipment with rated current ≤ 75A and conditional connection in public low-voltage power supply systems. Limitations on voltage fluctuations and flickers IEC 61000-4-15; 2003 Electromagnetic Compatibility, Part 4 Testing and Measurement Techniques: Chapter 15; Scintillation meters, functional and design specifications
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