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How to test current transformers
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<blockquote data-quote="Sidewinder" data-source="post: 419048" data-attributes="member: 9512"><p>OK, so they are true CT's thus they are A/A.</p><p></p><p>In which case they are really able to generate serious voltages!</p><p></p><p>In which case there may well have been further shorting links within the control panel.</p><p></p><p>To be compliant with statute law, these must have been indicated to you in the commissioning documentation.</p><p></p><p>If they are A/A CT's then you need 2 off current clamps.</p><p></p><p>One to measure the primary current and the second to measure the secondary, they should be in the ratio of the CT's in your case the secondary would be 0.5% of the primary current.</p><p></p><p>e.g. for 100A primary 0.5A secondary, this would then indicate that they were at least picking up the primary current.</p><p></p><p>Following this you would, as has been suggested elsewhere, need to check the "sense" of the secondary current, to ensure that the CT's were correctly connected.</p><p></p><p>Also, some, only some, CT's require a power supply to operate, so, that needs also to be present and correct.</p></blockquote><p></p>
[QUOTE="Sidewinder, post: 419048, member: 9512"] OK, so they are true CT's thus they are A/A. In which case they are really able to generate serious voltages! In which case there may well have been further shorting links within the control panel. To be compliant with statute law, these must have been indicated to you in the commissioning documentation. If they are A/A CT's then you need 2 off current clamps. One to measure the primary current and the second to measure the secondary, they should be in the ratio of the CT's in your case the secondary would be 0.5% of the primary current. e.g. for 100A primary 0.5A secondary, this would then indicate that they were at least picking up the primary current. Following this you would, as has been suggested elsewhere, need to check the "sense" of the secondary current, to ensure that the CT's were correctly connected. Also, some, only some, CT's require a power supply to operate, so, that needs also to be present and correct. [/QUOTE]
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How to test current transformers
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