[Electric engineering.] . f/e/af f?/?eosfafA/o. 2 Fig. 61. The only thing that must be looked out for is to see that theequalizer connects the brushes to which the series coils areattached, and also to see that these brushes are of the samepolarity. In some cases, the equalizer wire is run directly §15 ELECTRIC TRANSMISSION. 75 between the machines, as shown, but often a third wire isrun from points a and b to the switchboard and there con-nected to an equalizer bar, as shown in Fig. 61. This repre-sents a very common arrangement, triple-pole switchesbeing used; the two outside blades for the
[Electric engineering.] . f/e/af f?/?eosfafA/o. 2 Fig. 61. The only thing that must be looked out for is to see that theequalizer connects the brushes to which the series coils areattached, and also to see that these brushes are of the samepolarity. In some cases, the equalizer wire is run directly §15 ELECTRIC TRANSMISSION. 75 between the machines, as shown, but often a third wire isrun from points a and b to the switchboard and there con-nected to an equalizer bar, as shown in Fig. 61. This repre-sents a very common arrangement, triple-pole switchesbeing used; the two outside blades for the -f- and — leadsand the middle blade for the equalizer. There is a differ-ence of opinion as to whether it is better to run the equal-izer to the switchboard or run it directly between the To—bus baron sw//cbboard. To OfherDynamcg Equalizing Cab/e or Bus To OAher Dynamus. Fig. 62. machines, as in Fig. 60. The most recent practice tendstowards running it directly and placing the equalizer switchnear the machine. This undoubtedly tends to make theconnections shorter and thus leads to better such cases, the equalizer switch is usually mounted on apedestal near the machine, as shown in Fig. 62. 86. So far, in all that has been said, the machines weresupposed to be alike in size and general design. Under suchcircumstances, there is generally no great difficulty in get-ting compound-wound machines to operate properly in par-allel. Trouble is often experienced, however, when it comesto operating machines of different construction and size. 76 ELECTRIC TRANSMISSION. 15 Some field magnets will respond to changes in field excita-tion much more quickly than others, and other differencesin design may have considerable effect on the performanceof the machines when they are run in parallel. When
Size: 1856px × 1347px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidelectricengi, bookyear1902
