. Electric railway journal . FIG. 1—PLASH BARRIER INSTALLED ON 2000-KW., 3000-VOLT, SYNCHRONOUS MOTOR-GENERATOR SET USED INCONNECTION WITH HIGH-SPEED CIRCUIT BREAKERS. PIG. 2—500-KW., 25-CYCLE. 600-VOLT SYNCHRONOUSCONVERTER EQUIPPED WITH COMMERCIAL FORM OF FLASH BARRIER INSTALLED IN AUTOMATIC SUBSTATION rier has been the most common protection suggested,but most attempts to apply this plan have been unsuc-cessful. It was realized, also, that the means forpreventing flashing at the commutator and brushes ofd.c. machines must operate to remove the cause veryquickly. In this paper a special form
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. Electric railway journal . FIG. 1—PLASH BARRIER INSTALLED ON 2000-KW., 3000-VOLT, SYNCHRONOUS MOTOR-GENERATOR SET USED INCONNECTION WITH HIGH-SPEED CIRCUIT BREAKERS. PIG. 2—500-KW., 25-CYCLE. 600-VOLT SYNCHRONOUSCONVERTER EQUIPPED WITH COMMERCIAL FORM OF FLASH BARRIER INSTALLED IN AUTOMATIC SUBSTATION rier has been the most common protection suggested, but most attempts to apply this plan have been unsuc-cessful. It was realized, also, that the means forpreventing flashing at the commutator and brushes ofd.c. machines must operate to remove the cause veryquickly. In this paper a special form of barrier whichgives the required protection, and two forms of high-speed circuit breakers were described. A flash at the commutator starts from excessivesparking, produced by the breaking of current in the their energies on the design of a circuit breaker usingthe principle of a latch, a heavy spring and a seriestripping coil. The problem was to obtain very quicktripping, rapid acceleration of contact and a sufficientn