1. Power system harmonics.;Arrillaga,1985
2. Understanding power quality problems: Voltage sags and interruptions.;Bollen,2000
3. Electrical power systems quality.;Dugan,1996
4. Electric power quality.;Heydt,1995
5. IEEE. (1986). IEEE Standard C57.110-1986, IEEE recommended practice for establishing transformer capability when supplying nonsinusoidal load currents. New York.