Harmonics is dominated by high-harmonic source called commutation equipment (including chemical electrolysis rectifier equipment) and other non-linear loads generate harmonics generated harmonic source not only endanger the power grid and other power users but also endanger their own, so harmonic governance is essential and there is real economic benefit. Use safety rectification Our production of energy-saving devices, the harmonic current injection system allows national standards within the allowable range, the electrical equipment safe and reliable operation. In order to achieve better social and economic benefit.