Transf.distribucion
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15.1 CHAPTER 15 FIGURE 15.1 Electric utility distribution storage yard. Forklift trucks are used to load transformers on line trucks. Storage area is covered with concrete to pro- vide accessibility and protect transformers. DISTRIBUTION TRANSFORMERS The purpose of a distribution transformer is to reduce the primary voltage of the electric distribution system to the utilization voltage serving the customer. A distribution trans- former is a static device constructed with two or more windings used to transfer alternating- current electric power by electromagnetic induction from one circuit to another at the same frequency but with different values of voltage and current. Figure 15.1 shows distribution transformers in sto ck at an electric utility company ser- vice building. The distribution transformers available for use for various applications, as shown, include pole-type (Figs. 15.2 and 15.3), pad-mounted (Fig. 15.4), vault or network type (Fig. 15.5), and submersible (Fig. 15.6). The distribution transformer in Fig. 15.2 is self-protected. It is equipped with a lightning arrester, a weak-link or protective-link expulsion-type fuse (installed under oil in the trans- former tank), a secondary circuit breaker, and a warning light. The transformer primary bushing conductor is connected to one phase of the three-phase primary circuit through a partial-range current-limiting fuse. The transformer tank is grounded and connected to the
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