Transcription of CHAPTER 15 DISTRIBUTION TRANSFORMERS
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CHAPTER 15 DISTRIBUTION TRANSFORMERS
13/07/06 11:43AM Page CHAPTER 15. 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 shows DISTRIBUTION TRANSFORMERS in stock at an electric utility company ser- vice building. The DISTRIBUTION TRANSFORMERS available for use for various applications, as shown, include pole-type (Figs. and ), pad-mounted (Fig. ), vault or network type (Fig. ), and submersible (Fig. ). The DISTRIBUTION transformer in Fig. 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.
15.6 CHAPTER 15 When a load is connected to the secondary winding of the transformer, a current I s will flow in the secondary winding of the transformer. This current is equal to the secondary voltage
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