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Student & Learning Zone - City & Guilds
17th Edition, third harmonics question
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<blockquote data-quote="Alessandro" data-source="post: 416592" data-attributes="member: 27471"><p>Hello, I will take 17th Edition soon and I was doing practice questions with a simulator. The only answer I got wrong was the third harmonics one, I read it on the Regs but I don't get it. Would you be able to help me with a demonstration of the calculatioins needed to find the answer?</p><p></p><p><strong>Where a three phase circuit with a design load of 39 A has 20% third harmonics present, the design load after applying the rating factor for the harmonics would be:</strong></p><p></p><p>a. 54 A</p><p> b. 45 A --&gt; CORRECT ANSWER</p><p> c. 35 A</p><p> d. 4.5 A</p><p></p><p>Reference: Appendix 4, 5.5.2, page 335</p><p></p><p>The design load I get after applying the formula is 39.8 A but, according to the simulation, this is not the correct answer.</p></blockquote><p></p>
[QUOTE="Alessandro, post: 416592, member: 27471"] Hello, I will take 17th Edition soon and I was doing practice questions with a simulator. The only answer I got wrong was the third harmonics one, I read it on the Regs but I don't get it. Would you be able to help me with a demonstration of the calculatioins needed to find the answer? [B]Where a three phase circuit with a design load of 39 A has 20% third harmonics present, the design load after applying the rating factor for the harmonics would be:[/B] a. 54 A b. 45 A --> CORRECT ANSWER c. 35 A d. 4.5 A Reference: Appendix 4, 5.5.2, page 335 The design load I get after applying the formula is 39.8 A but, according to the simulation, this is not the correct answer. [/QUOTE]
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17th Edition, third harmonics question
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