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.
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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