NDLI: Application of capacitors for power-factor improvement of induction motors

Content Provider	IEEE Xplore Digital Library
Author	Bloomquist, W. C. Boice, W. K.
Copyright Year	1931
Abstract	POWER-FACTOR improvement of induction-motor loads by means of shunt capacitors has been a common practice for many years. Recently, the practice of connecting the capacitors directly at the motor terminals has developed in order to permit switching of the capacitors and motor as a unit. This will not result in adverse motor operation if the number of capacitors is selected properly. There is very little written material regarding operating experience, although capacitor and motor manufacturers have accumulated some experience.^1,2,3,4 This experience has shown that frequently too large a capacitor rating was used, resulting in overvoltage due to self-excitation when the motor starter was opened; in some cases the voltage rose to 200 per cent causing failure of motor insulation, indicating lamps, and other devices. In several instances, the motor coupling and shaft were damaged when too large a capacitor bank was used and the motor switched by a reduced-voltage autotransformer-type starter. In some cases, motors have been damaged from overload because allowance was not made in the overload setting for the reduction in line current due to the capacitors. In other cases, instruments and meters connected in the current-transformer secondary circuit have been damaged due to overvoltage.⁶
Starting Page	274
Ending Page	278
Page Count	5
File Size	2733822
File Format	PDF
ISSN	00959197
Volume Number	64
Issue Number	5
Language	English
Publisher	American Institute of Electrical Engineers
Publisher Date	1945-05-01
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Capacitors Induction motors Switches Synchronous motors Torque Voltage control Transient analysis
Content Type	Text
Resource Type	Article

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