Frequency response of Electromagnetic VoltageTransformers

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Dear Sir/Madam

I am doing a literature scan on Electromagnetic Voltage Transformers. I have read that EVT's do not have a linear flat frequency response for frequencies above the fundamental (i.e. 50/60Hz). I would like to enquire about the following:


1. Up to what frequency levels does the power quality (e.g. Harmonics) measurement accuracy of EVT's hold?


2. Have you conducted practical measurement tests using the EVT's? What was the accuracy percentage of the results obtained?


3. Beyond the frequency level which the accuracy of EVT's hold, what is the percentage deviation of measurements?




Your assistance will be highly appreciated



Kind Regards
Thabiso
 
VT/PT

VT/PT

A VT/PT will not have a flat frequency response due to the inductive/capacitive nature. Best bet is to search manufacturer literature: Ritz, ABB, etc.
 
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