To take advantage of characteristics of immittance converter, DC voltage is converted into sine-wave high frequency current and is isolated by high-frequency transformer, then three-phase sine-wave current source is achieved through cycle-converter split-phase modulation.

Here, water vapor was introduced into the process of the vapor-phase thermal cracking of DCPD as the diluting agent.

To meet the needs of large capacity of power supply in metallurgic enterprises,power supply by the phase arranging separately method was used,and the output circuit and output corridor were decreased,which had obvious economic benefits.