At present, the most important problem of electronic voltage transformer (EVT) is the accuracy decline after long-term operation in power grid. The existing methods include periodic off-line verification and on-line verification, but there are some problems such as long verification period, complex connection and low efficiency in field implementation. In this paper, a kind of EVT measurement error detection and type judgment system based on principal component-correlation dimension is proposed, which can detect and type judge the 0.2 level measurement error of EVT in a short time, and provide a certain foundation for error type judgment of other electrical components in the power grid and fault location of EVT.

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