GB401166A - Improvements in or relating to electric circuit interrupters - Google Patents

Abstract

401,166. Arc-rupturing in switches. WESTINGHOUSE ELECTRIC & MANUFACTURING CO., East Pittsburg, U.S.A.-(Assignees of Leeds, W. M. ; 916, Franklin Avenue, Wilkinsburg, Pennsylvania, U.S.A.) March 10, 1933, No. 7357. Convention date, March 18, 1932. [Class 38 (v).] High-tension switches ; magnetic blow-outs.-A deionizing structure, for mounting below each of the fixed contacts 15 of an oil or other insulating liquid switch, comprises a series of groups of plates, each group consisting of a pair of slotted plates 29 of insulating material with a slotted plate 31 of magnetic material interposed between them and additional spacing plates 35, 36 of fullerboard or other oil-absorbing insulating material, the slots 37 of all the plates being aligned to form a bore or passage in which the arc is drawn, said bore or passage being vented at one side only, in the neighbourhood of the end where the arc is initially drawn. For this purpose, the slots 37 of the upper spacing plates 35 are extended to the outer edges of the plates, as shown at 41, Fig. 7, and the main contacts 43 are downwardly biassed by springs 44 to close the slot 37 in the top plate 30 after withdrawal of the movable contact member 25. The top plate 30 also carries an arcing contact 32. Both the upper and lower groups of spacing plates 35, 36 may be provided with oil-retaining recesses 40. The magnetic plates 31 have insulating liners 33 to protect them from the arc.