US1786604A - Choke coil - Google Patents

Description

Dec. 30, 1930.

A B. DIBNER CHOKE COIL Filed Sept. 7. 1929 INVENTOR M M w P N w o 4 T T m RY MB Patented Dec. 30, .1930

PATENT OFFICE! ABRAHAM BERNARD manna, or rnnxsxrnr, new YORK CHOKE COIL Application filed September This invention relates to improvements in choke coils used in connection with electrical installations requiring the choking back of high frequency currents which may be induced or imposed upon the high tension transmission lines through either harmonies of surgies or creation by imposition of lightning charges upon the conductors.

A choke coil consists of a coil of wire, the

diameter of which is sufficient to carry the age surges as may be imposed upon the line,

It has been the practice to separate adjoining coils from each other by means of impregnated wood or synthetic resinous substances. Frequently, porcelain insulators are utilized to give the choke coil mechanical rigidity and strength. Impregnated woods and resins are conducive to rotting, due to the sulphurous and nitrous gases frequently surrounding power station equipment. Similarly, choke coils that depend upon porcelain to hold them together fail .because of the mechanical strain imposed on a highly fragile material such as porcelain, which fails when subjected to shock, a condition to be expected in equipment intended to react to lightning.

With the foregoing in mind it is thepurpose of the present invention to provide a frame of material upon which the coils of wire are supported and which will withstand any possible stress and strain to which a device of this character is ever subjected. I accomplish this purpose by means of the frame hereinafter described and claimed and one embodiment of which is illustratively exemplified in the accompanying drawings in which Figure l is a substantially longitudinal sectional view of a choke coil; and

7, 1929. Serial No. 390,898.

Figure 2 is an end elevational view of the frame and coil.

It should be briefly stated that the present invention does not appertain to any particular design of frame or coil, but relates only to a frame of this character constructed of a substance having very high resistance to electric current along with great mechanical strength, and composed in the main of metallic elements.

Referring to the drawings, 10 denotes a choke coil comprising a plurality of coils 11 of' high conducting wire for the conduction of the main line current and a frame. 12 supporting the coils. The frame 12 is made of a high strength, highly resistant metal, which renders the. frame free from decay and rot. The metal of which the frame is made comprises preferably a copper alloy, containing elements that increase strength and resistance simultaneously. The copper may be combined with phosphorus,

silicon, manganese, nickel, and tin to produce a bronze. This bronze has the characteristic of having less than 3% of the conductivity of pure copper and at the same time being in the major part constituted of copper, it may be brought into contact'with the copper choke coil 11 without invitin electrolysis which takes lace between dissimilar metals.

A c oke coil frame made of the bronze just described will be an all metal device unaffected by exposure to all climatic and atmos-v pheric condltions. It will be clear to one skilled in the art that the current would confine itself to the choke coil wire 11 and the leakage across the frame would be harmless as well as negligible. A choke of this character would be free from fire hazards, resulting ordinarily from high voltage flashover,

with great difficulty attack a. high resistance bronze. The slight conductivity of the frame Ion alloy would produce a by-pass that would absorb and dissipate the ener of the stroke thereby acting as a safety va ve, a condition not possible by using insulating material. 5 r In its preferred embodiment, the bronze according to my invention consists of the following elements:

7 Per cent Copper 90 1 Nickel 8 Silicon 1 Phosphorus Having now described minvention what I claim and desire to secure y Letters Patent 1. A choke coil of the character described, comprising a frame of non-conductive bronze conslsting of copper, phosporus, nickel, and silicon.

2. A non-conductive bronze for the frames of choke coils consisting of a combination of copper, 90%; nickel, 8%; silicon, 1 and phosphorus, I

, 3. A choke coil of the character described,

comprising a frame of metal'havin electrical conductivity of less than 3% 0 that of pure copper, and electrical conductor coils of metal wire supported on said frame.

In testimony whereof he has aflixed his signature.

' ABRAHAM BERNARD DIBNER.

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