Estimation of Voltage Sag Effects on Sensitive Equipment Due to Induction Motor Starting Cycles

Author: GÓMEZ JUAN CARLOS  

Publisher: Taylor & Francis Ltd

ISSN: 1532-5016

Source: Electric Power Components and Systems, Vol.31, Iss.7, 2003-07, pp. : 709-716

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Abstract

Voltage sag produced by induction motor starting current is one of the main causes of sensitive equipment dropout. The use of a motor starter reduces the voltage sag depth but increases its duration. The subsequent connection to full voltage produces a new sag separated from the first one by a few seconds. A simple method is presented that allows transforming the information of starting current/time characteristics to voltage sag depth/time characteristics that are directly comparable with the sensitive equipment susceptibility curves (CBEMA and other curves). The methodology also allows consideration of motor repetitive starts as well as different starting cycles.