. Electrical world. heavy weight, and is so arranged 490 ELECTRICAL WORLD and ENGLVEEK. Vol. XLIII, Xo. lo. that it can be adjusted to either oil, air-blast or water construction is massive, in keeping with the heavy duty forwhich it has been designed, such as street railway work or long-distance high-voltage performance. The transformers of this mag- nitude aie designed for any frequency fromvoltage, and for single or polyphase circuits. In upwards, for anysizes of this type TiniA FIG. J.— .\ILLTI-COIL the multi-coil construction is used, the complete transforme
. Electrical world. heavy weight, and is so arranged 490 ELECTRICAL WORLD and ENGLVEEK. Vol. XLIII, Xo. lo. that it can be adjusted to either oil, air-blast or water construction is massive, in keeping with the heavy duty forwhich it has been designed, such as street railway work or long-distance high-voltage performance. The transformers of this mag- nitude aie designed for any frequency fromvoltage, and for single or polyphase circuits. In upwards, for anysizes of this type TiniA FIG. J.— .\ILLTI-COIL the multi-coil construction is used, the complete transformer beingmade up of many coils, each having the required number of ratioturns within itself, and all coils being then joined in multiple to theterminals; so that a possible disablement of one coil does not meanthat the entire transformer must be replaced or the terminal voltagelowered. In these H. I. transformers, as they are known, the cross-sectionof copper allowed is liberal, and the copper used is FIG. ,V— COMPLETE. Owing to tlie nniiti-coil construction used, cross connection of coilsis unnecessary in order to maintain the equal voltage on each sideof the neutral wire for three-wire distribution. Ample allowanceof copper has also been provided for the increased amount of cur-rent required in the operation of inductive apparatus of low powerfactor. Special attention has been given also to questions of insula-tion, and mica insulation is used throughout in the construction of the coils, reducing to a minimum the liability or tendency to breakdown. An improved porcelain fuse box is furnished with broad elec-trical contacts and liberal copper parts, as well as a long fuse whichwill break the circuit in every case without injury, ample vent beingprovided for the escape of gases. The use of oil is recommended,especially in the larger sizes, but the companys guarantee requiresthat the oil used in the transformers shall be furnished by the com-pany its
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
