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Harmonics are periodic distortions of voltage, existing, or electrical power sine waves. Harmonics in electrical power distribution systems are often due to non-linear masses like switched manner dc energy supplies and adjustable velocity motor drives.Các địa phÆ°Æ¡ng phía Nam là khu vá»±c phát triển chủ yếu, Ä‘em lại nguồn thu chÃ

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