![]() ![]() ![]() Specific details of the cap structure and the manner of securing it to the conductor are not illustrated, since any of the well known expansion chamber structures and method of securing them to maintain the casing elements under coinpression may be employed. A gasket 26 of any suitable material is disposed between the end of the casing 20 and the cap 24 for sealing the joint therebetween, while a nut cap 28 in threaded engagement with the end of the conductor 10 retains the different elements In assembled position. 2,189,632 and 2,189,621, respectively, in practicing this invention.Īs is usual practice, in order to provide an expansion chamber for the dielectric medium 18 and to maintain the members 14 and 20 in assembled position with respect to the conductor 10, a hollow chamber or cap 24 is disposed about the end of the conductor and secured thereto to seaton the end of the casing 20. Although many different compositions can be used as the gasket 22, in order to ensure a sealed joint between the elements 14 and 20 it is preferred to employ the bushing structure embodying the seal of thermoplastic material for sealing the members 14 and 20 as disclosed and claimed in copending applications, Serial Nos. In assembling the tubular dielectric member 14 and the transparent casing 20 about the conductor 10 and condenser bushing 12, the joint between the abutting ends of the members 14 and is sealed with any suitable gasket 22 which is resistant to the conditions encountered in service. In practice it is preferred to utilize a transparent Smaterial such as glass as the casing 20, the casing being so proportioned with respect to the upper end of the tubular dielectric member 14 that it seats thereon in and-to-end relation when disposed about the conductor. Since the space between the condenser and the weather casing is to be filled with a dielectric medium 18 such as oil or other insulating fluids, a casing 20 of a character that the level of the dielectric medium 18 may be observed therethrough is disposed in spaced relation thereto. The tubular dielectric member 14 is provided with a plurality of radial creepage flanges Is as is usual practice. In order to provide a casing about the conductor )o If and condenser bushing 12, a dielectric tube member or weather casing 14 of some suitable material such as porcelain is disposed in spaced relation thereto as Illustrated in the drawing. The lower part of the condenser bushing 12 and the tank of the immersed apparatus with which the bushing is to be employed are not illustrated since they do not form a part of this invention, and the mechanism of the lower part of such bushing structures are well known. Referring to the drawing, the electrical apparatus with which the bushing is to be associated, includes a tubular conductor 10 which is wrapped with alternate layers of conducting and insulating material to constitute a condenser type of bushing 12. Other objects of this invention will become apparent from the following description when taken in conjunction with the accompanying drawing, the single figure of which is a view in elevation and partly in section of a portion of a bushing embodying the teachings of this invention. Another object of this invention is to provide a bushing having a sensitive indicator composed of a carrier and a material responsive to moisture conditions for its color, disposed within the bushing whereby the presence of moisture within the casing is indicated by the color of the material. In order to prevent damage to the bushing occasioned by moisture which may be admitted thereto, it is desired to provide a detector or indicator within the bushing which will indicate the presence of moisture before it causes serious damage to the assembly.Īn object of this invention is to provide a bushing having a sensitive detector or indicator for visually indicating the presence of moisture within the bushing. In time this moisture in the form of water works its way through the dielectric medium and penetrates the condenser impairing the dielectric properties of the bushing. In service, it is found that the seals between the elements of the bushing sometimes become imperfect with the result that the bushing "breathes" and moisture is admitted. In condenser bushings used on circuit breakers and transformers, a sealed structure is desired to prevent access of moisture to the condenser or dielectric medium within the bushing. This invention relates to high cension electrical bushings, and particularly to bushings having a visible indicator therein for indicating the presence of moisture. ![]()
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