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How to test current transformers
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<blockquote data-quote="Sidewinder" data-source="post: 419035" data-attributes="member: 9512"><p>Conventional CT's are V/A.</p><p></p><p>You must never open circuit the output of a CT as the output voltage can rise to astronomical levels, potentially fatal even.</p><p></p><p> Find out what the rating is, e.g 100mV/1000A, the CT impedance and the required load impedance etc.</p><p></p><p>Then ensure that they are connected to the load, and that the load is correctly dimensioned for the CT output.</p><p></p><p>i.e. correct voltage range &amp; input impedance to match the CT output.</p><p></p><p>Measure the output voltage with an accurate mV meter, measure the current flowing with an accurate clamp meter, do the maths and you will see if they are correct.</p><p></p><p>The polarity will give you an idea of the sense.</p><p></p><p>The links were almost certainly shorting links to ensure that the CT's when connected were never allowed to open circuit.</p><p></p><p>Nice to see the kit that you have to work with complies with statute law, NOT!</p><p></p><p>Another imaginary CE mark obviously.</p></blockquote><p></p>
[QUOTE="Sidewinder, post: 419035, member: 9512"] Conventional CT's are V/A. You must never open circuit the output of a CT as the output voltage can rise to astronomical levels, potentially fatal even. Find out what the rating is, e.g 100mV/1000A, the CT impedance and the required load impedance etc. Then ensure that they are connected to the load, and that the load is correctly dimensioned for the CT output. i.e. correct voltage range & input impedance to match the CT output. Measure the output voltage with an accurate mV meter, measure the current flowing with an accurate clamp meter, do the maths and you will see if they are correct. The polarity will give you an idea of the sense. The links were almost certainly shorting links to ensure that the CT's when connected were never allowed to open circuit. Nice to see the kit that you have to work with complies with statute law, NOT! Another imaginary CE mark obviously. [/QUOTE]
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How to test current transformers
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