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Current Tranformer Testing


JonAW

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Hi All

 

I don't know if this is the correct location on the forum but i'll ask anyway.

 

I would like to know if there are any devices on the market that can simulate a variable load up to 5A, equivalent to that given out from CT's. It is for testing ammeters and over current relays before the panels leave the workshop. Are there even any testing rigs we can set up from readily available components?

 

regards

 

Jonny

 

 

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  • 2 weeks later...

Hello Jonny

 

Some years ago, I made up a special tester to apply current to CT primarys.

 

I used a toroidal transformer, about 60VA, and wound two turns of 35mm flexible cable through the core.

I connected the primary to a variac and then is was just a case of passing the 35mm cable through the test CT and joining to close the circuit. The current could be adjusted by varying the voltage into the toroidal transformer.

 

Best regards,

Mark.

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  • 2 weeks later...
Hello Jonny

 

Some years ago, I made up a special tester to apply current to CT primarys.

 

I used a toroidal transformer, about 60VA, and wound two turns of 35mm flexible cable through the core.

I connected the primary to a variac and then is was just a case of passing the 35mm cable through the test CT and joining to close the circuit. The current could be adjusted by varying the voltage into the toroidal transformer.

 

Best regards,

Mark.

 

Hi Mark

 

Thanks for the reply. It should be a big help. I'm just pricing up the components now. I've never come across a toroidal transformer before and I'm guessing that they create a current from a voltage. Is this correct?

 

regards

 

Jonny

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Hi Jonny

 

A toroidal transformer is just like a standard transformer except that in construction, instead of being wound on E and I laminations, it is wound on a toroidal core. (the core is much like the toroidal core used for current transformers.)

The advantage of the toroidal core for this application, is that it is easy to add a single or two turn high current winding.

You could look at getting a special transformer wound with a low voltage high current secondary.

 

Best regards,

Mark.

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