EAF is generally a three-phase power supply through a dedicated arc furnace transformers, high-voltage side of the transformer is usually 6.3KV, 10KV, 35KV, there 110KV, low-pressure side is usually more than one hundred volts to more than a thousand volts. EAF specifications currently used mainly between 2T to 100T furnace. EAF working conditions in two basic stages of melting and refining period, due to the melting of a large number of unmelted material, the furnace is unstable, when irregular current waveform, the harmonic content of large, primarily 2,3 4,5,6,7 and other more low-order harmonics, contains a lot of inter-harmonics, accompanied by voltage fluctuations and flicker, resulting in grid voltage and current distortion. Refining of EAF stable harmonic content is not. We focused on the characteristics of the electric arc furnace, electric arc furnace sets of non-standard design filter compensation equipment, for different conditions, different manufacturers EAF designed. Low TSF filtering devices commonly used for high-pressure system to use more SVC filter device.