. Electric railway journal . this circuit. By way of contrastto this the automatic substation has demonstrated itsability to handle a short-circuit without flashing. Sev-eral times when the short-circuit current would havereached a value in excess of 4000 amp., the only indica-tion of trouble was a faint squeak. In one test thetrolley wire was short-circuited to the rail within 1000ft. of the station. In this case a flash started but it wasextinguished by the wire arc coolers. This non-flashingfeature of the automatic substation is worthy of con-sideration. It is, of course, due to the use of
. Electric railway journal . this circuit. By way of contrastto this the automatic substation has demonstrated itsability to handle a short-circuit without flashing. Sev-eral times when the short-circuit current would havereached a value in excess of 4000 amp., the only indica-tion of trouble was a faint squeak. In one test thetrolley wire was short-circuited to the rail within 1000ft. of the station. In this case a flash started but it wasextinguished by the wire arc coolers. This non-flashingfeature of the automatic substation is worthy of con-sideration. It is, of course, due to the use of the flashguards and the load-limiting resistors which have acushioning effect. These resistors could be used in amanually-operated substation to supplement the circuitbreakers. How the Automatic Contributes to Reliability ofPower Supply As stated previously, lightning entered the automaticsubstation practically without doing any damage. Italso entered the manually-operated substation, where it OREGON AVE ENGLEWOOD RACE tRACK. SIMPLIFIED DIAGRAM OF SUBSTATION CONNECTIONSAND FEEDERS jumped to the low-voltage release of the rotary circuitbreaker and blew the instrument fuses. A bearing wasburned out in the manually-operated station, also, whichwould not have occurred with automatic control. The automatic substation, as will be seen from theaccompanying map of the system, is located in SouthButte and operates in parallel with the central substa-tion through an automatic sectionalizing switch. The March 22, 1919 Electric Railway Journal 567
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