. Electric railway journal . DIAGRAM CONNECTIONS FOR TESTING INSTRUMENTS as all potential can thus be removed from all carequipment. Before such a temperature test is started it is ad-visable to make certain that all covers can be readilyremoved from apparatus on which temperature readingsare to be taken. In the first test of this nature withwhich I was connected it was almost impossible to re-move several of the motor covers. The removal ofcovers out on the line is quite a different propositionfrom their removal in a shop provided with proper. MAIN-FIELD TEMPERATURE RISE AS COMPUTED FROMRESIS
. Electric railway journal . DIAGRAM CONNECTIONS FOR TESTING INSTRUMENTS as all potential can thus be removed from all carequipment. Before such a temperature test is started it is ad-visable to make certain that all covers can be readilyremoved from apparatus on which temperature readingsare to be taken. In the first test of this nature withwhich I was connected it was almost impossible to re-move several of the motor covers. The removal ofcovers out on the line is quite a different propositionfrom their removal in a shop provided with proper. MAIN-FIELD TEMPERATURE RISE AS COMPUTED FROMRESISTANCE MEASUREMENTS 4500 45 4000 40 3500 d 35+- o o 3000^ 30u-?500 a 25c 2000 » Z0„ I500z. 15° 1000 % 10500 m 50 0 , 1 5 10 15 ACCELERATION AND DISTANCE GRAPH FOR TEST TRAIN facilities. Also such tests are usually made with carsloaded and the clearances between the tops of motorsand the car body are often very small. In the particularcase mentioned it took twenty minutes to remove thecovers after the test was discontinued so that there was a considerable drop in temperature of the windingsbefore the thermometers could be placed. This, ofcourse rendered the results worthless. Some Results op a Service TestIn the service heat runs which I have been consider-ing in this article, runs corresponding to local service,express service and mixed local and express servicewere made on successive days. Constant temperaturewas reached in the main field winding of the motors inlocal service after six hours operation, in express serv-ice after five
Size: 2159px × 1157px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
