Posted by Janicholson on March 23, 2012 at 07:36:53 from (12.47.242.135):
In Reply to: Simple amp meter posted by Doug - Iowa on March 22, 2012 at 19:02:09:
Wikipedia Current Transformer. The turns ratio is pretty dramatic, so a not of caution is included from Wiki here: Care must be taken that the secondary of a current transformer is not disconnected from its load while current is flowing in the primary, as the transformer secondary will attempt to continue driving current across the effectively infinite impedance. This will produce a high voltage across the open secondary (into the range of several kilovolts in some cases), which may cause arcing. The high voltage produced will compromise operator and equipment safety and permanently affect the accuracy of the transformer.
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