Consideration on the Dynamic Characteristics of the Three Phase Rectifier Type Welders with Self Saturable Reactor

Abstract

Dynamic characteristics of the rectifier type d.c. welders with drooping or c.p. characteristics are discussed and it is shown that the short circuit transient current takes the form shown in Fig. 1(a) when the impedance of the interphase connection Z_P is low, and the drooping characteristic is attained. When Z_P is large, the transient current shows the tendency shown in Fig. 1 (c)-(e).
Transient current i_f in control winding is also shown in Figs. 3 and 4 for Z_P =0 and Zp= ∞ respectively.