Harmonics, power factor correction and transient overvoltage analysis in a stainless steel cold rolling mill plant system caused by voltage sags

This paper presents guidelines for analyzing harmonics, power factor correction and transient overvoltage in a stainless steel cold rolling plant using sendzimir cold rolling mill process. The rolling mill loads operate at a wide range variation of power factors and reactive power that results in penalty to charges and bus voltages variation. In addition, the nonlinear characteristics of the rolling mill drives cause significant harmonic currents flowing through the plant and utility power system. These harmonic currents result in system voltage distortion and power loss in the system. The measurement of voltage and current auto reclosing supply voltage during power line disturbances has been performed. Voltage sag and short interruption occurrence often exist in such a case study. The extended analysis of results may lead to identifying problems and possible correction measures.