Some recent tests of oil circuit breakers

Author(s): E. B. Merriam
Publisher: IEEE - Institute of Electrical and Electronics Engineers, Inc.
Publication Date: 1 July 1911
Volume: 30
Page(s): 1,431 - 1,448
ISSN (Paper): 0097-2444
DOI: 10.1109/PAIEE.1911.6659602



Whenever an electrical circuit carrying considerable energy is opened in oil, gases are generated. These expand and rise, and tend to force the oil out of the containing vessel. They also form with air explosive mixtures, and either explode, or burn for a considerable length of time when ignited. It is important, therefore, that oil circuit breakers be provided with strong oil containing vessels in order that they may withstand the high initial stresses which are often present under certain conditions and also that suitable provision be made for retaining the oil.