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Do-It-Yourself (DIY) Question & Answer Forum
A Thought Experiment
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<blockquote data-quote="Doc Hudson" data-source="post: 349743" data-attributes="member: 1607"><p>Measure the resistance between any pair of windings call that value 'A'.</p><p></p><p>Short out one pair of terminals (which will either be one or two windings), then measure the resistance between the unshorted terminal and the two shorted terminals.</p><p></p><p>If Star isn't the new resistance going to be 'A' + (2x'A' in parallel) i.e. 1.5x'A'</p><p></p><p>If Delta isn't the new resistance going to be 2x'A' in parallel as the third winding is shorted out ie. 0.5x'A'</p><p></p><p>So if your new reading is greater than original reading it is Star if less than it is Delta.</p><p></p><p>Or am I missing something? </p><p></p><p>Doc H.</p></blockquote><p></p>
[QUOTE="Doc Hudson, post: 349743, member: 1607"] Measure the resistance between any pair of windings call that value 'A'. Short out one pair of terminals (which will either be one or two windings), then measure the resistance between the unshorted terminal and the two shorted terminals. If Star isn't the new resistance going to be 'A' + (2x'A' in parallel) i.e. 1.5x'A' If Delta isn't the new resistance going to be 2x'A' in parallel as the third winding is shorted out ie. 0.5x'A' So if your new reading is greater than original reading it is Star if less than it is Delta. Or am I missing something? Doc H. [/QUOTE]
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A Thought Experiment
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