Djx specialized in carbon graphite materials and products for more than twenty years, we are confident to provide you high quality products with the most reasonable price, please join us to enjoy our quality and services. Djx supplies graphite plate for spd surge protection device with various sizes, customerized products are available depending on your pictures and drawings, we will recommend the most suitable graphite material for you, please contact us for more details. Based on the disadvantage of traditional gap surge protector (spd), and combined with the material characteristics of graphite and thompson gas discharge theory, a large scale of experiments on the new type of graphite gap spd were completed by open circuit voltage wave generator and icgs impact system. The results show that, after the high voltage trigger capacitance device was added to the new type of graphite gap spd, every gap was triggered step by step so that the voltage protection level was reduced. At the same time, the graphite gap spd is better than traditional gap spd on time delay characteristics, and is able to achieve the arc extinction requirements before the power frequency voltage dropped to zero. In addition, graphite belongs to non-metal materials; it won't produce plasma under high temperature, which can improve the stability of device and delay aging.