. Electric railway journal . Prevents Flash-overs on Milwaukee Electrification With This Apparatus the Energy Waste Resulting from the Installation of a PermanentResistance or an Increased Length of Feeder Cable to ReduceHigh Current Values Is Avoided WHEN the decision to use high-tension directcurrent was made by the Chicago, Milwaukee& St. Paul Railway it was recognized that somemeans would have to be taken to prevent the flashoverof the direct-current generators in case of a short-circuiton the overhead line. One suggestion made was thatthe company install resistance in the substations inse
. Electric railway journal . Prevents Flash-overs on Milwaukee Electrification With This Apparatus the Energy Waste Resulting from the Installation of a PermanentResistance or an Increased Length of Feeder Cable to ReduceHigh Current Values Is Avoided WHEN the decision to use high-tension directcurrent was made by the Chicago, Milwaukee& St. Paul Railway it was recognized that somemeans would have to be taken to prevent the flashoverof the direct-current generators in case of a short-circuiton the overhead line. One suggestion made was thatthe company install resistance in the substations inseries with the trolley circuit to cut down the currentto a safe value. However, it was found that the con-struction of a suitable permanent resistance would bedifficult and expensive; that the resistance would takeup a great deal of room; and finally, that the energywaste would be appreciable. The electrification depart-ment, through R. Beeuwkes, electrical engineer, there-fore favored the1 trial of some simpler and more. FIG. 1—HIGH-SPEED CIRCUIT BREAKER WITH ARCCHUTE REMOVED. FIG. 2—HIGH-SPEED CIRCUITBREAKER WITH MAGNETIC BLOWOUT3000 AMP., 3600 VOLTS economical method. To this end, the General ElectricCompany developed a high-speed breaker which wastested out at Schenectady on a motor-generator for the Milwaukee electrification. An auxiliary benefit of no mean value is the greaterprotection afforded to the companys telephone circuitswhich parallel the contact line. Since the installationof these breakers, the annoying acoustic shocks whichpreviously occurred from short-circuits have disap-peared. Notwithstanding the fact that this telephoneline parallels both the 3000-volt direct-current contactline 40 ft. away and the 100,000-volt alternating-currenttransmission line 80 ft. away, the operation of thetelephones is very satisfactory. No attempt was made to eliminate inductive inter-ference other than fully to transpose the weak-currentcircuits for varying lengths; t
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