The choices of parameters of transformer, secondary output voltage, maximum output current, capability, voltage regulating progression and step voltage are the crucial factors, which determines the degree of LW graphitization process.

• 内串石墨化工艺的关键设备是变压器，变压器的参数：二次输出电压、最大输出电流、容量、调压级数、级差电压选择的合理与否，决定了内串石墨化工艺水平的高与低。