US 1641702 A
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1,641,702 p 1927" s. D. SPRONG MEANS FOR COOLING TRANSFORMERS Filed May 4, 1925 Inventor: Severn D. Spron' y wa His Attorney.
Patented Sept. 6, 1927.
UNITED STATES PATENT OFFICE.
SEVERN D. SPRONG, 0F BROOKLYN, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.
MEANS FOR COOLING TRANSFORMERS.
Application filed May 4,
of heat dissipation istherefore highly de sirable as it will result in permitting the transformer to carry a greater maximum load without overheating.
The walls and floor of a manhole casing are in intimate contact with the surrounding earth which is often moist or otherwise of such character that it is a good conductor of heat. The general object of the invention is to provide an improved arrangement to take advantage of this fact to increase the cooling of anencased oil immersed trans former by circulating a suitable heat absorbing liquid such as'the oil in contact with surfaces which are in good thermal relation with the manhole casing, whence heat may be given up to the cool earth surrounding the manhole.
The invention will be better understood from the following description taken in connection with the .accompanying drawing in which Fig. 1 is a vertical sectional view of a manhole containing an encased transformer of the oil immersed type, the wall or casing of the manhole having a pipe or conduit embedded therein for the circulation and" cooling of oil from the transformer. casing; Figs. 2 and 3 are similar sectional views of .manholes showing modified forms of the invention, and Fig. 4 is a detail sectional view on the line 44 of Fig. 3. ,1
Like reference characters refer to similar parts in the difierent figures of the drawing.
In the particular arrangement shown in Fig. 1, the manhole comprises a floor 10, walls 11, and a top 12, the top having an opening with a cover 13 to permit access to the inside of the manhole. The manhole contains an encased transformer 14 of the oil immersed type. A pipe or conduit 15 is em bedded at a convenient place in the manwalls being corrugated, as shown in .in Figs. 1 an heat from the oil are built into the manhole.
1925. Serial No. 27,655.
hole casing and connected through suitable valves 16with the upper and lower parts of the C'3.S1Ilg of the transformer14. As the 011 1n the casing of the transformer 14 is heated, it is thus permitted to flow by convection through the pipe or conduit 15 to be, cooled before returning to the transformer. I
In the arran ement shown in Fig. 2, a metal radiator 1 is secured to the inner face of the manhole wall, a suitable cement or compound having good heat conducting qualities being used if desirable between the radiator and the wall to im rove the heat conductivity between the oil in the radiator and the casing wall. The radiator .17 is connected through valves 16 with the upper and lower parts of the transformer casing 14 as in the arrangement shown in Fig. 1.
In the arrangement shown in Figs. 3 and 4, a metal radiator 18'is built into and forms a section of the wall 11 of the manhole. This radiator 18 comprises an upper header 19 communicating with the upper part of the transformer casing-'14 and a lower header 20 communicating with the lower part of the transformer casing. The headers 19 and 20 are spaced apart by a radiator section formed of two side walls of sheet metal welded into the headers, the outer of tlFrese 1 4, to increase its area of contact with tlge surrounding earth.
The arrangement shown in Fig. 2 is particularly applicable in connection with manholes which are already built as the radiator 17 may be installed without distuibing the manhole casin In the arrangements shown 3, theparts for dissipating casing and are thus more particularly applicable when they may be installed during the construction of new manholes.
The invention provides .a simple and eflicientmeans for increasing the load capacity of a transformer in a manhole and this is frequently of great advantage, particularly in manholes in large cities where it is often very diflicult to provide suflicient transformer capacity in the limited space available.
What I claim as new and desire to secure by Letters Patent of the United States is:
1. An underground manhole, a transformer immersed in oil within a casing inslde said manhole, heat radiating means having a sur- 1- face i ood thermal relation with-the casmg of said manhole, and means for conduct- 011 from the transformer easing lIltO v contact with said surface.
2. An underground manhole, a transformer immersed 1n 011 within a caslng lnslde said manhole, the casing of said manhole comprising a section having oil conducting passages, and means for conducting oil from sald transformer casing to said passages and back to sand transformer casing.
3. An underground manhole, a transform er within a casing lIlSlde said manhole, heat radiating means having a surface 1n good thermal relation with the casing of said 15 my hand this 28 day of April, 1925.
SEVERN D. SPRONG.