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How to test current transformers
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<blockquote data-quote="Barx" data-source="post: 418856" data-attributes="member: 121"><p>As per title really,</p><p></p><p>How does one test an in-situe split core current transformer?</p><p></p><p>As part of the latest PV job we have been labouring on, it had to have export limitation. The incomer had 3 cores / phase and some there was 3 CT's per phase and each bunch of 3 then ran through a current summation transformer. I never done this sort of thing and we were against the clock. The shut down was 2 hours late due to other influences, not us. We fitted them all and connected the to the cable that I had previously ran from the export limit panel. when we powered back up only 1 phase was reading. so we had to order for the tx to be shut off again, luckily no other plant was turned on.</p><p></p><p>Out of 3 of us, none knew how to test the CT's so all we could do was recheck our work. I did find a lose factory connection so thought that would fix one of the phase sets, but it didn't. Anyways, we were ordered to turn back on and leave at 7pm last night so had to leave it as was.</p><p></p><p>How could we have tested them to figure out better what was going on and with current summation transformers is it a case of if one of the CT's in a phase set wasn't working then there would be no reading? I doubt there would be 6 not working at all?</p><p></p><p>Cheers</p></blockquote><p></p>
[QUOTE="Barx, post: 418856, member: 121"] As per title really, How does one test an in-situe split core current transformer? As part of the latest PV job we have been labouring on, it had to have export limitation. The incomer had 3 cores / phase and some there was 3 CT's per phase and each bunch of 3 then ran through a current summation transformer. I never done this sort of thing and we were against the clock. The shut down was 2 hours late due to other influences, not us. We fitted them all and connected the to the cable that I had previously ran from the export limit panel. when we powered back up only 1 phase was reading. so we had to order for the tx to be shut off again, luckily no other plant was turned on. Out of 3 of us, none knew how to test the CT's so all we could do was recheck our work. I did find a lose factory connection so thought that would fix one of the phase sets, but it didn't. Anyways, we were ordered to turn back on and leave at 7pm last night so had to leave it as was. How could we have tested them to figure out better what was going on and with current summation transformers is it a case of if one of the CT's in a phase set wasn't working then there would be no reading? I doubt there would be 6 not working at all? Cheers [/QUOTE]
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