4.3.3example1
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A step down transformer with a primary voltage of 6.6 kV and a ratio of 25:1 has a secondary voltage of 264V at the principal tap. At the +5% tap, the secondary voltage is 251.4V due to the increased turns ratio of 26.25:1. At the -5% tap, the secondary voltage is 277.9V because of the decreased turns ratio of 23.75:1.
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4.3.3example1
- 1. Example 1 A step down transformer has a ratio of 25:1 and a rated primary voltage of 6.6 kV. Calculate the secondary voltage: At the principal tap. at the +5% tap, and at the -5% tap. (a) E 2 at principal tap = V 1 = 6600 = 264 V 25 25
- 2. Example 1 A step down transformer has a ratio of 25:1 and a rated primary voltage of 6.6 kV. Calculate the secondary voltage: At the principal tap. at the +5% tap, and at the -5% tap. (b) At +5% the turns ratio = 105 x 25 = 26.25:1 (Increases turns ratio) 100 E 2 at +5% tap = V 1 = 6600 = 251.4 V 26.25 26.25
- 3. Example 1 A step down transformer has a ratio of 25:1 and a rated primary voltage of 6.6 kV. Calculate the secondary voltage: At the principal tap. at the +5% tap, and at the -5% tap. (c) At -5% the turns ratio = 95 x 25 = 23.75:1 (Decreases turns ratio) 100 E 2 at -5% tap = V 1 = 6600 = 277.9 V 23.75 23.75 Note that an increase in the turns ratio results in a lower output voltage and a decrease in the turns ration will result in an increase in the output voltage.