Parallel electrical surge-protective varistors
OwnerEdward F. Allinainventor
Life of this patent
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Abstract
Surge-protective varistors connected to shunt transient surges in electrical power lines to ground before damage to watt-hour meters or downstream loads. Conductive laminar members provide compact parallel circuit interconnection of varistors to increase the current-carrying capacity of protective apparatus containing them.
Claims15
Assembly of surge-protective apparatus in insulated holding means for varistors of given diameter and thickness protecting against lightning or other source of transient electrical surges, comprising
- a plurality of varistor means, each including a plurality of varistors interconnected in parallel circuit by conductive laminar members interleaved adjacent respective varistor faces, each such varistor having a hot face and a ground face,
- each such laminar member including a pair of conductive laminae interconnected by a flexible conductive bight curved to juxtapose the laminae spaced apart in contact with corresponding faces of a pair of varistors in such varistor means, one such laminar member connecting the hot faces of such varistors and another such laminar member connecting the ground faces of such varistors.
Electrical surge-protective apparatus, comprising
- a plurality of varistor means respectively connectable between respective power lines and ground, at a location between a hot or utility meter side and a ground or utility panel side, and ahead of downstream electrical equipment, comprising
- a varistor-holding device,
- a plurality of like varistors in the holding device,
- a plurality of conductive laminar members interleaving the varistors and connecting them in parallel circuit, and
- a hot lead to such a power line, and
- a conductive ground plane member in contact with the ground side of each of the varistor means.
Apparatus comprising varistors stacked face-to-face, adapted to provide surge-protection between a power line and ground, each varistor being disklike with hot and ground faces, comprising
- a first varistor and a second varistor connected in parallel as a first pair, and a third varistor and a fourth varistor connected in parallel as a second pair,
- pair of conductive interleaving members, one such member interconnecting the hot faces of the first pair, and the other such member interconnecting the ground faces of the first pair, and
- a second pair of conductive interleaving members, one such member interconnecting the hot faces of the second par, and the other such member interconnecting the ground faces of the second pair, and
- a third pair of conductive interleaving members, one such member interconnecting the hot faces of a varistor in the first pair and a varistor in the second pair, and the other such member interconnecting the ground faces of a varistor in the first pair and a varistor in the second pair.
Dependencies are inferred from the claim text.