Study On The 'Special' Over-Criterion Harmonic Current

'Special' over-criterion harmonic current appears when harmonic current is over-criterion,but no prominent harmonic source in the system could be found in the testing.Through the analysis on testing result of typical cases of over-criterion harmonic current and taking simulation analysis into account to explain the cause of them,this paper puts forword solutions which would benefit the harmonic management and the revi- sing work of harmonic national standard.