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VT errors

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dfdt

dfdt

Electrical
Joined
Sep 10, 2002
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118
Location
AU
Can some one let me know if ratio and phase angle errors of a VT can be assumed linear within the range of 25% to 100% of its rated burden?
 
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IEC 61869-3 for Voltage transformers categorises VTs in to Cat. A & B. Cat. A is with burden ratings not exceeding 10VA. Others are Cat. B.
The accuracy class declared shall be valid from 0-100% burden in case of Cat. A VTs and from 25% - 100% burden for those in Cat. B.
 
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Thanks Scottf i too believe that the errors would be fairly linear as long as power factor is similar
 
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The standard insists for the linear characteristics between the said range. However, you may check the factory test reports of the actual VT of the manufacturer where you bought.
 
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