primary arc

In this paper, firstly, based on the analysis of the models of the primary arc and the secondary arc under the temporary single-pole fault, the waveform of the voltage of faulty phase under the different type of fault is simulated by ATP-EMTP.

本文首先分析了单相瞬时性故障情况下的一次电弧和二次电弧模型，利用ATP-EMTP仿真软件仿真得到了不同故障性质情况下的故障相端电压波形；

The appropriate tapping temperature and composition, designed for primary melting GH1040 base metal in arc furnace, provide necessary energy for VOD refining.

设计的初炼炉出钢成分及其出钢温度，为GH1040母材在VOD精炼过程中提供了所需要的热能。

The radial and axial displacements of spherical arc center are primary reason for form error, and spherical symmetry error respectively.

球面圆弧中心径向位移是工件产生球面轮廓形状误差的主要原因，而球面圆弧中心轴向位移则是球面产生球形对称度误差的主要原因。