An elementary book on electricity and magnetism and their applications . Transformer Fig. 258. — Small transformer casefastened to a Fig. 259 a. — Outdoor substation with three 150,000-volt water-cooled trans-formers at San Bernardino, California. TRANSFORMERS 379 case fastened to a pole, which would contain a transformer ofprobably less than 15 kv-a. capacity, such as might supply per-haps 25 to 50 customers. The case is filled with oil, whichserves both as an insulator and as a cooling medium, and ithas a corrugated surface so that the radiating surface is muchincreased. In very large
An elementary book on electricity and magnetism and their applications . Transformer Fig. 258. — Small transformer casefastened to a Fig. 259 a. — Outdoor substation with three 150,000-volt water-cooled trans-formers at San Bernardino, California. TRANSFORMERS 379 case fastened to a pole, which would contain a transformer ofprobably less than 15 kv-a. capacity, such as might supply per-haps 25 to 50 customers. The case is filled with oil, whichserves both as an insulator and as a cooling medium, and ithas a corrugated surface so that the radiating surface is muchincreased. In very large station transformers the heat cannot be radiatedfast enough even with a corrugated case, so that the oil hasto be water-cooled. Coils ofcopper pipes are placed in thetop of the case immersed inthe oil and through these pipescold water is kept 259 shows a largewater-cooled transformer suchas is frequently used in powerstations and substations. Thewater pipes are placed nearthe top of the transformer casewhere the oil is hottest. Thewater piping must be carefullyconstructed of seamless tubingso as not to leak, bec
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
