IEC 61000-4-18:2019 is an International Electrotechnical Commission (IEC) standard that specifies the testing and measurement methods for immunity to electromagnetic disturbances of electrical and electronic equipment in power frequency range (up to 150 kHz). The standard provides guidelines for assessing equipment's performance against voltage fluctuations, flicker, and harmonics caused by power supply network disturbances.
Understanding Power Frequency Range
Power frequency range refers to the frequency of alternating current (AC) electricity commonly used in homes and commercial buildings. In many countries, the power frequency is 50 Hz or 60 Hz, depending on the electricity grid specifications. Equipment designed to operate within this frequency range should meet certain standards to ensure its immunity to electromagnetic disturbances caused by power grid anomalies.
Assessing Voltage Fluctuations and Flicker
Voltage fluctuations refer to temporary variations in the electrical voltage supplied by the grid, which can negatively affect the performance of sensitive electrical and electronic equipment. Flicker, on the other hand, is a perceptible variation in the brightness or intensity of light emitted by devices like lamps or display screens due to voltage fluctuations. IEC 61000-4-18:2019 defines test procedures and limits for voltage fluctuations and flicker to ensure equipment's stable operation.
Evaluating Harmonics Disturbances
Harmonics are currents or voltages that have frequencies that are whole number multiples of the fundamental power frequency. These harmonics can distort the waveforms, causing interference, overheating, and efficiency losses in electrical systems. IEC 61000-4-18:2019 provides measurements and evaluation methods to assess equipment's immunity against harmonics and sets limits to ensure their safe performance within the power frequency range.
Nina She