. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . oj:et rid of the heat in the transformercoils, and to do this, the coils whengrouped together side by side arc notplaced one directly against the are inserted between the coiU, soplaced that ducts are formed and the heat can be carried away by air or oilflowing in the ducts, the amount of heattaken off depending on the method em-ployed for cooling. Enough of these ven-tilating ducts must be provided to insurea uniform temperature, and must be cor-rectly located so that hot spots
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . oj:et rid of the heat in the transformercoils, and to do this, the coils whengrouped together side by side arc notplaced one directly against the are inserted between the coiU, soplaced that ducts are formed and the heat can be carried away by air or oilflowing in the ducts, the amount of heattaken off depending on the method em-ployed for cooling. Enough of these ven-tilating ducts must be provided to insurea uniform temperature, and must be cor-rectly located so that hot spots will notexist. If a part of the coil is not properlycooled it will be overheated and cause aburnout. The spacing strips may be straight (thetype used in air blast transformers) orthey may be wavy in form, as used inthe insulated transformers and shown inFig. 2. These strips vary in thicknessdepending on the size and type of thetransformer. An average thickness wouldbe approximately ^/^ in. The iron, consisting of punchings ofsilicon steel less than .02 in. thickin the shell type of transformer, is. WIRES AND DUCTS FOR OIL built around the group of coils enclos-ing them entirely, for the distance A Bin Fig. 1. When completed, the trans-former has the appearance shown in , the iron forming a shell around themain body of the assembled coils, onlythe ends projecting. The coil of pipeshown above the transformer is used forcooling purposes only, and will be ex-plained fully when the different types oftransformers are taken up. The type of transformers in generaluse is the Air Blast Transformer, theOil Insulated Self-Cooled (CISC) andthe Oil Insulated Water Cooled (O I WC) transformers. The air blast transformer is mountedin a housing, which is provided withdampers for governing the inflow of cool-ing air as the actual duct area is inexcess of the actual area required forthe cooling of the transformer. For thisreason the dampers arc provided andwhen several t
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
