Các ??a ph??ng phía Nam là khu v?c phát tri?n ch? y?u, ?em l?i ngu?n thu chính cho x? s? ki?n thi?t, v?i h?n 93% th? ph?n c? n??c.Harmonics are periodic distortions of voltage, existing, or power sine waves. Harmonics in electricity distribution methods are sometimes a result of non-linear hundreds including switched manner dc energy supplies