Bathaee - Khajeh Nasir -al- deen Toosi University MW

The harmonic pollution in electric disterbution system Is due to the effects of nonlinearity in electric devices such as .machines, transformer, power electronic components in residential & industrial loads.Besides technial problems, measuring instruments error, include watthour meters should be considered.This paper will summarise what Is known about the effects of harmonics on watthour measurments and other power measurment mode in disterbution system .