Operation of frequency changers

The objects of this paper are; 1. To analyze the fundamental theory underlying the parallel operation of frequency changers. 2. To consider the various running conditions imposed upon the parallel operation of frequency changers. 3. To apply the theory to the operating conditions in such a manner that it is possible for the operator without technical information, to automatically obtain the correct conditions applying to synchronizing under all possible conditions of load. 4. Development of formulas applying to the phenomena in question