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Voltage Sag-Related Upsets of Industrial Process Controls in Petroleum and Chemical Industries
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In the modern industrial facility, many electrical and electronic control devices are routinely integrated into automated processes, increasing the potential for electrical compatibility problems. Hardwired motor control circuits are now retrofitted with PLC controls. The sensitivity of these process controls can stop an essential service motor required for a continuous process such as in a refinery or chemical plant. Typically the controls are sensitive to the common momentary voltage sag caused by power system faults many miles away from the plant location. The number of upsets is directly related to the number of these events and the sensitivity of process control equipment. This paper describes the sag-related upset problem and explains how today's motor control technology determines the immunity of entire petroleum and chemical process and plants.
Mansoor, A.; Key, T.; Woinsky, S. (1998). Voltage Sag-Related Upsets of Industrial Process Controls in Petroleum and Chemical Industries. Energy Systems Laboratory (http://esl.tamu.edu). Available electronically from