Automatic synchronizing of mill power system circuit breakers

The development of synchronizing equipment and of the electrical connections used for synchronizing and connecting two independent power systems is reviewed. A number of considerations are given that should be studied for planning the installation of automatic synchronizing to replace existing manual systems. A centralized automatic synchronizing system is presented as installed in one paper mill power house. The system includes a master manual-automatic synchronizing panel and a remote synchronizing panel. The system is used to synchronize and close 16 generator, utility, and bus connecting breakers. Diagrams of the basic electrical connections are shown as well as pictures of the synchronizing panels.<>