Case study: flicker transfer coefficient and frequency components

Abstract. Voltage fluctuations related to light flicker can propagate along a distribution network with their attenuation being affected by the topology of the network, the line impedances, and the characteristics of the loads and the transformers. The propagation leads to different simultaneous flicker measurements at different voltage levels. This work documents a case study in which three points in a distribution network were monitored, with the flicker level being measured simultaneously at 132KV, 30KV, and 13KV. Two types of flicker transfer coefficient are discussed, taking into account the impact of different types of loads, the spectral characteristics involved in the flicker measurements, and possible strategies for flagging dip events at the three voltage levels. Key words Power quality, flicker measurement, flicker transfer coefficient, frequency component, dip event. 1