脉宽调制技术是用来降低总功率交付给了负荷，没有造成损失，这是通常发生时，电源是有限的，由电阻芫件。
Pulse width modulation is used to reduce the total power delivered to a load without resulting in loss which normally occurs when a power source is limited by a resistive element.
该装置在总馈电开关处的漏电保护装置使用附加直流电源原理，在分支馈电开关处的漏电保护装置使用零序功率方向式保护原理。
This device use the principle of additional DC power supply in main feeding switch, and use the principle of direction of zero sequence power in branch feeding switch.
中频电源的总功率可以在两台炉体之间任意分配使用，达到一台炉体熔化另一台炉体保温的效果。
The power of IF power can be distributed between two furnaces arbitrarily, which makes one furnace in charge of melting and the other insulating .
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