US1958159A - Disconnecting switch with compensated electrodynamic forces - Google Patents

Description

- y 3, 1 c. BRESSON DISCONNEQTING SWITCH WITH COMPENSATED ELECTRODYNAIIC FORCES Filed March 27, 1931 imfe/zl'or C/zarleaZresa OIL Patented May 8 1934 a I UNITED STATES PATENT OFFICE DISCONNECTING SWITCH WITH COIVIPEN- SATED ELECTRODYNAMIC FORCES Charles Bresson, Villeurbanne, France, assignor to Ateliers de Constructions Electriques de Belle, Paris, France Application March 27, 1931, Serial No. 525,846 In Germany March 28, 1930 2 Claims. (Cl. 200-87) The disconnecting switches of electric lines are By suitably selecting the dimensions of the generally formed with a knife blade forming a loop a, b, c, d, the loop a b c' it may be dispensed loop with the current leads. When a short circuit with and neverthelessa resultant F directed downoccurs a field is generated within the loop and wards obtained. This is shown in Fig. 3, wherein 5 the forces thus generated open the disconnecting the blade is pivoted at A and opens the line 60 switch. at X.

A disconnecting switch of this character can- In the construction illustrated in Fig. 2 the curnot be utilized on lines where short circuit current is lead in by way of a terminal P fromwhich rents are heavy in view of the fact that the knife extend two shaped conductors G at the free end blade would open at each short circuit. of which is fixed a contact having jaws M. The 55 The present invention avoids this disadvanparts G thus form the loop designated by a b c d tage. It has for its object a disconnecting switch in Fig. 1. One of the arms G may be dispensed characterized in this that the current leads form with. at least at one of the ends of the knife blade 3. Having now particularly described and ascerloop which gives to the electrodynamic forces acttained the nature of my said invention and in 79 ing on the knife blade a direction such that the what manner the same is to be performed, I deopening of the knife under the action of short clare that what I claim is: circuit currents may be avoided. 1. A disconnecting switch for electric lines,

Figs. 1 and 2 show respectively a schematic arcomprising a movable knife blade adapted to conrangement and a part view of a disconnecting nect the two extremities of a part of an electric 75 switch in accordance with the invention and Figline, knife blade supports carrying the line curure 3 is a diagrammatic representation of a modirent and forming with the blade a first loop, the fied form of the invention wherein one side loop is blade moving away from the center of this loop dispensed with. The knife blade is denoted by to open the line, and aloop formed by one extremi- C and the two loops formed by the conductors by ty of the blade support with the corresponding 80 a, b, c, d, and by a, b, c, d. The disconnecting end of the blade, and above said blade, the secswitch opens by moving the knife blade upwards. ond loop being opposed to the first.

The apparatus thus forms three loops, a large 2. In a disconnecting switch, a displaceable loop D d, d, E, as also two small loops a b c d and knife blade forming several loops with the exa b c 11. These three loops generate electrotremities of an .electric line which said blade condynamic forces F1, F2, F3, the first of which is dinects together, and a forked support at the openrected upwards while the two others tend to oping end of the blade and constituted by the expose the opening of the knife blade. The dimentremities of the line to be opened, said forked sions a d, d d and d a. are so selected that the support constituting a loop above the blade and 35 resultant of the three forces F is directed downin planes parallel to the plane of said blade and wards and consequently opposes the opening of at each side thereof. the knife blade. I CHARLES BRESSON.

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