Recent progress in distribution practise of the Brooklyn Edison Company, Inc.

Changes in the transmission and distribution system of the Brooklyn Edison Company during the past four years are briefly described and mention is made of the effect of these changes on the system's efficiency. In 1927 a low-voltage, a-c. network will be installed and this will be extended to care for the load growth until it becomes the principal supply system for low-tension energy in Brooklyn. The plan of development is described in detail. The unique features are: First, a suitably designed network unit consisting of a three-phase, 500-kv-a., low-loss transformer with an automatic network circuit breaker mounted in the low-tension pothead of the transformer. Second, the operation of the high-tension feeders without regulators, at 27,000 volts, direct from the generating station. Third, the ultimate plan of interlacing the high-tension feeders to reduce the overload on transformers and to maintain good voltage regulation with one feeder out of service, and to pick up overload in areas of different load characteristics to obtain the advantage of diversity. It is shown that this plan of development insures better service to the customer from every point of view, makes for safer working conditions on the system, results in general system improvement and involves less total investment as well as a considerable reduction in losses and operating costs. The appendixes describe tests made to determine whether arcing and short-circuit faults in the network will be self-clearing, the permissible voltage fluctuations on incandescent lamps, and the dissipation of heat from transformer vaults.