The influence of motor reacceleration on voltage sags

Journal Article · Sat Jul 01 04:00:00 EDT 1995 · IEEE Transactions on Industry Applications

DOI:https://doi.org/10.1109/28.395271· OSTI ID:131554

Bollen, M H.J. ^[1]

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1. Univ. of Manchester Inst. of Science and Technology (United Kingdom). Manchester Centre for Electrical Energy

The assumption that a voltage sag is rectangular is not correct in a system with large induction motor loads. The motors decelerate during the short circuit. After fault-clearing they will accelerate again, drawing a high reactive current from the supply, causing a prolonged postfault voltage sag. This is aggravated by the removal of branches by the protection. The resulting shape of some voltage sags in an example system is shown and discussed. For the example system, a stochastic voltage sag table is determined. This table gives the expected number of sags of different depth and duration. The influence of faster protection and o reduced transformer impedance on the table is presented. A simple motor model is implemented in a method for including interruptions due to voltage sags in the reliability analysis of power systems. This model is presented briefly and used to show the influence of motor parameters on the number of sags that lead to an interruption of plant operation.

• OSTI ID: 131554
• Journal Information: IEEE Transactions on Industry Applications, Journal Name: IEEE Transactions on Industry Applications Journal Issue: 4 Vol. 31; ISSN 0093-9994; ISSN ITIACR
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
ELECTRIC CURRENTS
ELECTRIC MOTORS
POWER SYSTEMS
RESPONSE FUNCTIONS
VOLTAGE DROP