US1614250A - Electrical apparatus - Google Patents

Description

, Jan. 11 1927 1,614,250

w. s. MOODY ELECTRICAL APPARATUS Filed June 2 8, 1921 0 0 Q 0 O Q 0 O O O Q Q Q Q 0 O Q 0 lnventor Walter- S.Mood y, y M4. W

H is Attorney.

Patented Jan. 11, 1927.

UNITED STATES PATENT OFFICE.

WALTER S. MOODY, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR TO GENERAL ELEC- TRIC COMPANY, A CORPORATION OF NEW YORK.

ELECTRICAL Application filed June 28,

My invention relates to electrical apparatus, and particularly to oil submerged electrical apparatus; and has for its object an improved construction and arrangement of parts which is economical and readily manufactured,

In oil submerged electrical apparatus, such as transformers, some reactors. oil switches and the like, it has been found that the air space above the oil in the casing which houses the apparatus has many disadvantages in addition to making the apparatus bulky and therefore needlessly expensive.

It accordingly has been proposed to eliminate the air space and fill the casing entirely with oil and to take care of the expansion and contraction of the oil content thereof by the provision of an auxiliary tank or casing, generally styled a conservator which is arranged to communicate with the main casing.

Such conservators, according to the best practice, are made not only to keep the air away from the hot oil and thereby prevent sludging or rapid oxidization of the oil, but to collect and trap moisture; a special sump being generally provided to this end as taught in the U. S. Letters Patent to Kulka No. 1,002,527.

It frequently becomes desirable to increase the capacity of such oil submerged electrical apparatus and still maintain them as selfcooled units by suitably attaching to the casing one or more radiators or equivalent radiating units so as to decrease the normal temperature rise when operating under load. These radiators must of course be in liquid communication with the oil content of the main casing at both top and bottom; otherwise there would be no circulation of the oil through the radiator to dissipate the heat engendered by the electrical apparatus.

According to the practice prior to my invention, these radiators were always materially shorter in length than the height of the main easing.

In tanks equipped with conservators, ll take advantage of the fact that the casing is entirely filled with oil in practicing my invention, since I increase the length of radiators and arrange them to communicate with the uppermost part of the cover of the easing, thereby getting a more rapid circulation of the oil and at the same time efiectu' APPARATUS.

1921. Serial No. 481,137.

ally increasing the radiating surface at substantially a minimum cost.

For a more complete understanding of the nature and objects of my invention reference should be had} to the following eetailed description when taken in connection with the accompanying drawing in which:

The figure shows in side elevation a trans former casing constructed in accordance with my invention.

Referring now to the drawing, denotes a casing made preferably of boiler plate for an electrical apparatus, here assumed to be a transformer. such casing being provided with a removable cover 11 with a dependiug outer edge portion and an auxiliary casing 12 which is in liquid communication with and serves as an expansion chamber for the oil content of the main casing. This auxiliary casing is shown as supported from the main casing by means of the supporting structure 1.3.

Insulating bushings for the leads to the transformer windings are shown at 14- and 15 respectively.

Radiating units for increasing the capacity of the apparatus rated as a self cooled unit are shown at 20. Each unit comprises headers 21. at the top and bottom connected by tubular passages preferably of oval cross section. The precise construction of these units is, however, no part. of my present invention which rcsidesrather in their manner of application to conservator type casings.

These units have suliicient length to reach from substantially the bottom of the casing 10 to the top of the cover; communication at the points in the bottom being established by means of the elbow couplings 22 leading to the bottom headers, communication with the cover 11. being established through the elbow couplings 24 extending substantially horizontally between the top headers and the flanged nipples 23 which project from the depending edge portion of the cover near the uppermost part thereof.

The cost to make. the radiating units sufficiently long to connect with the nipples in the cover 11 over that formerly employed to connect with some point near the top of the side wall of the casing 10 is comparatively small. On the other hand this small, additional cost results in a comparatively large increase in effective radiatng surface.

Having now described an embodiment. of

- my invention which is at present the best means known to me for carrying: t'rw same into ell'ect, I would have it understood Ihat this is merely illustrative, and that I do not mean to be limited thereby to the precise details shown nor restrieted in the choice of recognized equivalents except as defined in my claim hereunto annexed.

What I c aim as ne\ and desire to secure by Letters Patent of the United States, is:

A casing for electrical apparatus, said casing being provided with a removable covet-having :1 depending outer edge portion, a plurality of radiating units spz ced about said casing, each (lf-rfitlld radial ins, units coinnuini 'ating with said casing llittl' the bot tom thereol and havng: a coni'leclion extending from its upper end substant'ully horizontally to said depending edge potuion oi the cover near its uppermost part said ea.-:- ing and 'adiating units being completely filled with a liquid insulating medium and an auxiliary using in liquid cominuni "ation with and serving as an expansion chamber for said liquid insulating med um,

in witness whereof, I have hereunto set my hand this 23rd day of June, i921.

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