A new approach to simultaneous unbalances

The problem of analyzing simultaneous unbalances which occurs from time to time in otherwise balanced power systems has been given attention by a number of investigators. Methods of analysis which have been proposed and used include direct calculations using appropriate equations.
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Generally this approach is rather laborious for a complex system, although with the rapid advances in the use of digital computers it is to be expected that this approach will become increasingly favored. A systematic approach to setting up the basic equations and constraints for the problems has recently appeared.
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