Measurement of the impact of electrical equipment on power supply quality

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Measurement of the impact of electrical equipment on power supply quality [Copy link]

Abstract: This paper describes in detail the measurement methods of harmonics, voltage fluctuations and flickers of electrical equipment and the key points of their related technical standards.

Keywords: Standard harmonic voltage fluctuation flicker measurement

Power supply quality is a hot topic of concern. The extensive use of switching power supplies, thyristor devices, etc., on the one hand, has improved people's efficiency in using electric energy, and on the other hand, has generated a large amount of harmonic current in the power grid, which results in interference with other electronic products on the same power grid. Harmonic currents can also cause overload of the neutral current in the power grid, affecting the power grid's ability to transmit electricity. In addition, the phase control of the AC power supply can also cause changes in the effective value of the current on the power grid, resulting in significant fluctuations in the effective value of the voltage, which can cause flickering of lighting devices.

In order to ensure the quality of power supply and protect human health, the International Electrotechnical Commission (IEC) TC77 Committee has compiled two standards suitable for evaluating the impact of low-voltage equipment below 16A on the quality of power supply in the power grid.