Absjrad -Three-phase h C . arc furnaces @AF) are sources of voltage fluctuations, harmonics and unbalances in the power supply system. Modern high-power ft"ces with a rated power of 100 M V A or more a n often coupled at the KV. busses in order to limit these power quality impacts. However, the remaining impacts are Widely spreaded in these cases, since they are dissipated, via the KV. distribution and transmission system, to downstmm MV. and LV. networks supplied by the HV. system which is meshed and extented usually. Especially the voltage fluctuations generated by the furnaces and dissipated in the ILV. network are noticed as flickers in LV. light installations. "he paper presents mults and experiences galned by means of slmulaneous field tests at different node points in a meshed 380/220/110 kV system supplying, among others, electrical steel plants and urban areas as weU General conclusions are drawn concerning the dissipation of power quality impacts.
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