. Electrical world. rips. Each fixed contact isforced downward by three coiled springswhich are carried on the studs on whichthe fixed contacts slide, and which arescrewed on the battom of the fixed contacts, as well as theblades, have ground surfaces. On clos-ing the switch, each contact blade slidesunder the corresponding contact,and, owing to the arrangement of thesprings, a perfect self-aligned contactresults. The shape and position of the shuntor arc-rupturing contacts are such as toprevent any possibility of the arc beingtaken by the main contacts. These auxiliary
. Electrical world. rips. Each fixed contact isforced downward by three coiled springswhich are carried on the studs on whichthe fixed contacts slide, and which arescrewed on the battom of the fixed contacts, as well as theblades, have ground surfaces. On clos-ing the switch, each contact blade slidesunder the corresponding contact,and, owing to the arrangement of thesprings, a perfect self-aligned contactresults. The shape and position of the shuntor arc-rupturing contacts are such as toprevent any possibility of the arc beingtaken by the main contacts. These auxiliary contacts are readilyreplaceable. In the illustration, the oil level indicator can be seenon the left of the insulator, the construction of which is the oil leak out, or, for any other reason, recede below a safelevel, the indicator closes the pilot circuit and warns the attendantby ringing a bell or lighting a lamp, as may be desired. Each switch is tested at volts and, in installing, the iron. FIG. 3.—3,50C-V0LT OIL SWITCH. tends to flare upwards, increasing its length and thereby securing alonger break than in the vertical type, with the same separation ofcontacts. The contacts are located comparatively near the surfaceof the oil, so that the gases resulting from the explosion are readilydissipated, and. by using comparatively large tanks and long breaks,the switch may be opened and closed many times before the oil iscarbonized appreciably. May 21, 1904. ELECTRICAL WORLD and ENGINEER. I top and tanks are grounded, making it perfectly safe for the oper-ator to handle the controlling device. The three-pole switch is madeup of three of the imits described above, connected by rods and thecrank on eath operating shaft to either a motor, magnet or hand-operated controlling device, and the operation of either of these de-vices may be controlled by plain overload, time delay overload orreversed current relays. Each pole of the switch may be mountedin either s
Size: 2201px × 1135px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
