Excitation system is a device designed to supply exciting current for generator, including brush static silicon excitation and brushless excitation. The brush static silicon excitation has wide application range, quick response speed, and it requires to equip large excitation transformer, the repair and maintenance work of collecting ring and carbon brush is not easy. The brushless excitation system is generally not suitable for large capacity and low speed unit, the response speed is slower than silicon controlled one, and large excitation transformer is not required, the operation and maintenance work is easy without collecting ring and carbon brush. Our company is able to supply various kinds of excitation device as per clients requirements.