With the development of science and technology, harmonic control, along with the level of industrial production and people's living standards improve, harmonic control cabinet prices, a large number of non-linear electrical equipment put into operation in the grid, resulting in a harmonic component accounted grid the proportion is growing. It not only increases the power loss of the power grid, the cost of harmonic control, and protection from interference with the normal operation of the grid system automation devices, causing these devices malfunction and refused to move, a direct threat to the safe operation of the grid. Power system harmonics from the electrical equipment, that is to say from the power generating equipment and electrical equipment. Since the magnetic field generated by the rotor of the generator can not be perfect sine wave, the voltage waveform generator issue can not be a little distorted sine wave grid voltage waveform quality affect the main contradiction is non-linear electrical equipment, that is to say non- linear electrical equipment is the main source of harmonics, nonlinear electrical equipment mainly in the following four categories: · arc heating equipment: If the electric arc furnaces, welding and the like. · AC rectified DC power equipment: If the locomotive, electrolysis, electroplating and so on. · AC rectifier inverter electric equipment again: as frequency control, inverter air conditioners. Switching power supply equipment: If IF furnace, color television sets, computers, electronic rectifiers. These electrical equipment are nonlinear electrical equipment, but they produce harmonics vary, specifically exemplified as follows: since the arc Arc heating device is at least 70 volts will arc, arc current will have, and the interrupter voltage slightly lower than the arcing voltage, resulting in non-linear arc current and arc voltage. Harmonic sales, harmonic control, provided by the Henan Xi Xi Connaught Electrical and Mechanical and Electrical Equipment Co. Connaught. Harmonic sales, harmonic control, Xi Xi Henan Connaught Connaught Electrical and Mechanical Electrical Equipment Co., Ltd. (www.hnxinuo.com) this year introduced a new upgrade, the above picture is for reference only, please call the contact picture on this page or telephone obtain the latest information, contact: Yang Yongjie.